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Under the background of the extensive development of renewable power generation and integration, a new kind of sub-synchronous oscillation issue, called Sub/Super-Synchronous Control Interaction (SSCI), which is closely related to the control system of power electronic converters, has attracted wide attention. Sub/super-synchronous oscillation (SSO) belongs to the category of small signal stability, and its characteristics are closely related to the operation mode of power grid and the parameters of controller in power grid. However, for a large-scale renewable power system, on the one hand, the operation mode changes frequently; on the other hand, conventional modal analysis method suffers a heavy computational burden for the eigenvalue calculation of the high-dimensional state matrix, which finds it difficult to meet the requirements of online analysis, prevention and control of SSO. For rapid online assessment of the matching degree of controller parameters in power generation and grid under current operation mode, a novel method to construct controller parameter stability region (PSR) is proposed. Based on Gerschgorin disk theorem (GDT), the eigenvalue distribution range of the system state matrix containing controller parameter variables is rapidly estimated, replacing the time-consuming direct calculation of eigenvalues. In consequence, the feasible value set of the controller parameter, which is the PSR, is deduced according to the small signal stability criterion and corresponding stability constraints on the obtained eigenvalue distribution range. On the basis of PSR, the stability margin evaluation index is proposed to rapidly evaluate the distance between the controller parameter set and the boundary of the PSR, providing guidance for the reasonable selection and online refreshing of the controller parameters under the current operation mode for the prevention and control of SSO, so as to secure the safe and stable operation of the high-proportion renewable power grid. Specifically, the preconditions of the application of the GDT on the PSR construction are discussed in detail, and a construction method of transition matrix based on the system state matrix is proposed in this paper. The transition matrix is used for the PSR construction instead of applying the system state matrix directly to overcome its limitations. Furthermore, to reduce the conservativeness of the PSR, a method for extension of the PSR is also given. In the end, the validity and correctness of the proposed method are verified by the Direct-Drive Permanent Magnet Synchronous Generator (D-PMSG) model, connected with the main ac grid by Voltage Source Converter-based High-Voltage Direct Current (VSC-HVDC). The efficiency of the proposed method is highlighted by comparing the proposed method and the point-wise eigenvalue calculation of the state matrix from a time-consuming perspective, which demonstrates its potential for online application.
Song Ke; Tao Lin; Yibiao Sheng; Hui Du; Shuitian Li; Baoping Chen; Rusi Chen; Qingyan Li. Sub/Super-Synchronous Oscillation Oriented Dominant Controller Parameters Stability Region Based on Gerschgorin Disk Theorem. Applied Sciences 2021, 11, 1205 .
AMA StyleSong Ke, Tao Lin, Yibiao Sheng, Hui Du, Shuitian Li, Baoping Chen, Rusi Chen, Qingyan Li. Sub/Super-Synchronous Oscillation Oriented Dominant Controller Parameters Stability Region Based on Gerschgorin Disk Theorem. Applied Sciences. 2021; 11 (3):1205.
Chicago/Turabian StyleSong Ke; Tao Lin; Yibiao Sheng; Hui Du; Shuitian Li; Baoping Chen; Rusi Chen; Qingyan Li. 2021. "Sub/Super-Synchronous Oscillation Oriented Dominant Controller Parameters Stability Region Based on Gerschgorin Disk Theorem." Applied Sciences 11, no. 3: 1205.
Self-healing of smart distribution networks with distributed generators, which are usually operated as independent islands after fault, can improve power-supply reliability. As a hot research topic, a self-healing scheme is usually treated as the output of a nonlinear optimizuoation model. However, existing strategies have two main shortcomings. The first, high-optimization dimension, results in low-optimization efficiency. The second, the effects of power-quality issues, which are more serious on islands and may further threaten the safe operation of islands, is usually neglected. To quickly obtain a reliable self-healing scheme, a novel strategy is proposed. As the first step, the distribution network after a fault occurrence can be divided into several trouble-free subnets via the connectivity analysis; each subnet is called an initial island. Further, for each initial island, a two-step optimization model of self-healing, which consists of load-shedding optimization and network reconfiguration optimization, is proposed to obtain the self-healing strategy with lower searching space as well as higher solving efficiency. In detail, in load-shedding optimization, by means of heuristic differential evolution algorithm, larger total recovery capacity is achieved by considering the droop characteristic of distributed generators (DGs) within the permissible change in frequency. In network-reconfiguration optimization, based on the improved hybrid particle swarm optimization algorithm, a comprehensive set of power-quality constraints, including constraint of change in frequency, uncertain constraints of node voltage total harmonic distortion (THD), and negative sequence components of DGs, is developed to guarantee the reliability of each island. To evaluate whether the constraints are satisfied during the optimization procedure, an improved flexible power-flow algorithm is developed to calculate the power flow of each island under change in frequency. Further, 2m+1-point estimate method is employed for uncertainty analyses of the distributions of harmonic and negative sequence components caused by the uncertainty of corresponding sources. Finally, via a 94-node practical distribution network, the effectiveness and advantages of the proposed strategy in safety, recovery capacity, and optimization efficiency are verified.
Song Ke; Tao Lin; Rusi Chen; Hui Du; Shuitian Li; Xialing Xu. A Novel Self-Healing Strategy for Distribution Network with Distributed Generators Considering Uncertain Power-Quality Constraints. Applied Sciences 2020, 10, 1469 .
AMA StyleSong Ke, Tao Lin, Rusi Chen, Hui Du, Shuitian Li, Xialing Xu. A Novel Self-Healing Strategy for Distribution Network with Distributed Generators Considering Uncertain Power-Quality Constraints. Applied Sciences. 2020; 10 (4):1469.
Chicago/Turabian StyleSong Ke; Tao Lin; Rusi Chen; Hui Du; Shuitian Li; Xialing Xu. 2020. "A Novel Self-Healing Strategy for Distribution Network with Distributed Generators Considering Uncertain Power-Quality Constraints." Applied Sciences 10, no. 4: 1469.
Low frequency oscillation occurs frequently in the smart grid, which threatens the security andstability of the physical system. Wide-area damping controller (WADC), whichbelongs to cyber system, can effectively suppress inter-area low frequencyoscillations and improve the small signal stability of the closed-loopcyber-physical system (CPS). However, with the introduction of global signals,time delays of communication are inevitable. Considering that, this paperdeduces the general mathematics expression among electromagnetic torquecoefficients, WADC control parameters and time delays, which makes it possibleto analyse the influence mechanism of time delay on small signal stability.Based on these analysis, on the one hand, the time-delay small signal stabilityregion is established to evaluate the operation state of closed-loop CPS, on theother hand, if small signal stability is not achieved due to the measured timedelays, optimisation scheme is proposed to carry out WADC control parameterscoordination to optimise small signal stability of the closed-loop system.Finally, taking two time delays as example, this study verifies theeffectiveness and advantages of the proposed method by comparing the closed-loopsystem performance considering two time delays with the cases of consideringsinge time delay and without time delay.
Yibiao Sheng; Tao Lin; Rusi Chen; Baoping Chen; Guili Ding; Xialing Xu; Chang Xie; Lin Liu. Electromagnetic torque analysis‐based method for performance evaluation and optimisation of closed‐loop CPS regarding small signal stability. IET Cyber-Physical Systems: Theory & Applications 2018, 3, 187 -193.
AMA StyleYibiao Sheng, Tao Lin, Rusi Chen, Baoping Chen, Guili Ding, Xialing Xu, Chang Xie, Lin Liu. Electromagnetic torque analysis‐based method for performance evaluation and optimisation of closed‐loop CPS regarding small signal stability. IET Cyber-Physical Systems: Theory & Applications. 2018; 3 (4):187-193.
Chicago/Turabian StyleYibiao Sheng; Tao Lin; Rusi Chen; Baoping Chen; Guili Ding; Xialing Xu; Chang Xie; Lin Liu. 2018. "Electromagnetic torque analysis‐based method for performance evaluation and optimisation of closed‐loop CPS regarding small signal stability." IET Cyber-Physical Systems: Theory & Applications 3, no. 4: 187-193.
The existing out-of-step splitting device may be worse in adaptability under multi-frequency out-step oscillation scenario. Aiming at this problem, this paper presents an out-of-step splitting strategy based on compound information to adapt to the migration of oscillating center. In detail, the proposed strategy can obtain bus voltage amplitude/phase information provided by WAMS and local Ucosφ criterion to determine position of out-of-step oscillation center and out-of-step period. The proposed strategy can greatly simplify the configuration and parameter setting of out-of-step splitting devices. Simulation results show that the correctness of the proposed strategy under multi-frequency out-step oscillation scenario.
Youqiang Xiao; Hangpeng Ni; Wen Qian; Tao Lin; Ruyu Bi. A New Out-of-Step Splitting Strategy Based on Compound Information. Programmieren für Ingenieure und Naturwissenschaftler 2018, 247 -252.
AMA StyleYouqiang Xiao, Hangpeng Ni, Wen Qian, Tao Lin, Ruyu Bi. A New Out-of-Step Splitting Strategy Based on Compound Information. Programmieren für Ingenieure und Naturwissenschaftler. 2018; ():247-252.
Chicago/Turabian StyleYouqiang Xiao; Hangpeng Ni; Wen Qian; Tao Lin; Ruyu Bi. 2018. "A New Out-of-Step Splitting Strategy Based on Compound Information." Programmieren für Ingenieure und Naturwissenschaftler , no. : 247-252.
With the increasing installation of the high-voltage direct current device and flexible AC transmission system, the power transfer capability increases significantly. However, the risk of line overloads or even cascading failures caused by DC blocking or line outage also augments, which requires accurate and effective post-contingency corrective control (CC) actions. Traditional sensitivity-based methods are fast, but are less accurate and may suffer from the seesaw problem. Artificial intelligence optimisation-based methods usually exhibit better CC performance but are time-consuming. For fastly performing accurate CC actions, a second-order cone programming (SOCP)-based CC optimisation model for line overloads alleviation in meshed AC/DC power systems is proposed. Initially, to reduce the number of CC actions and optimisation variables (OVs), a heuristic search method is proposed to automatically select the most effective generators/loads for the overloaded lines. Subsequently, thyristor controlled series capacitor (TCSC) compensation levels and multi-terminal direct current (MTDC) power are treated as additional OVs to minimise load shedding/generation rescheduling. Additionally, to boost computational efficiency, SOCP format power flow equations for systems with MTDCs and TCSCs are proposed. Eventually, the effectiveness, accuracy, and superiority in computational efficiency of the proposed method are verified based on the modified IEEE 30-bus test system.
Ruyu Bi; Tao Lin; Rusi Chen; Jing Ye; Xueming Zhou; Xialing Xu. Alleviation of post‐contingency overloads by SOCP based corrective control considering TCSC and MTDC. IET Generation, Transmission & Distribution 2018, 12, 2155 -2164.
AMA StyleRuyu Bi, Tao Lin, Rusi Chen, Jing Ye, Xueming Zhou, Xialing Xu. Alleviation of post‐contingency overloads by SOCP based corrective control considering TCSC and MTDC. IET Generation, Transmission & Distribution. 2018; 12 (9):2155-2164.
Chicago/Turabian StyleRuyu Bi; Tao Lin; Rusi Chen; Jing Ye; Xueming Zhou; Xialing Xu. 2018. "Alleviation of post‐contingency overloads by SOCP based corrective control considering TCSC and MTDC." IET Generation, Transmission & Distribution 12, no. 9: 2155-2164.
Active power steady-state security regions (APSSRs), which can provide guidance for prevention and control through security checks, is of great importance for the safe operation of power systems in which more and more sustainable energy power generation is integrated. As a mature flexible AC transmission system (FACTS) device, thyristor-controlled series compensators (TCSCs) can carry out series compensation for the transmission line by controlling its equivalent reactance. With the change of the equivalent reactance parameter of a TCSC, the nodal admittance matrix and power flow distribution of the power system also changes. Inevitably, the APSSR will be different. Therefore, it is necessary and important to further incorporate the equivalent reactance parameters of TCSCs in the APSSR expression, which is generally established in the space of node active power injections. In this paper, a rapid construction method of APSSRs incorporating the equivalent reactances of TCSCs is proposed. Firstly, applicability and efficiency of the conventional APSSR construction method for power systems with TCSCs are analyzed. Further, with equivalent disconnection of TCSC branches, the effect of TCSC equivalent reactances on the distribution of active power flow through changing the structure parameters is treated as modifying node active power injections. On this basis, explicit expressions of APSSRs with a single TCSC equivalent reactance parameter and double TCSC equivalent reactance parameters are derived, respectively. Moreover, by deducing the general formula of APSSRs with multiple TCSC equivalent reactance parameters, the feasibility of the proposed method for power systems with multiple TCSCs is analyzed. Eventually, via benchmarks with different scales and a different number of TCSCs, validity and superiorities of the proposed method in computational efficiency are demonstrated.
Rusi Chen; Tao Lin; Baoping Chen; Ruyu Bi; Xialing Xu. Novel Method for Rapidly Constructing Active Power Steady-State Security Regions Incorporating the Equivalent Reactances of TCSCs. Energies 2018, 11, 551 .
AMA StyleRusi Chen, Tao Lin, Baoping Chen, Ruyu Bi, Xialing Xu. Novel Method for Rapidly Constructing Active Power Steady-State Security Regions Incorporating the Equivalent Reactances of TCSCs. Energies. 2018; 11 (3):551.
Chicago/Turabian StyleRusi Chen; Tao Lin; Baoping Chen; Ruyu Bi; Xialing Xu. 2018. "Novel Method for Rapidly Constructing Active Power Steady-State Security Regions Incorporating the Equivalent Reactances of TCSCs." Energies 11, no. 3: 551.
Accurate detection and effective control strategy of commutation failure (CF) of high voltage direct current (HVDC) are of great significance for keeping the safe and stable operations of the hybrid power grid. At first, a novel detection method for consecutive CF is proposed. Concretely, the 2nd and higher orders’ derivative values of direct current are summarized as the core to judge CF by analyzing the physical characteristics of the direct current waveform of the converter station in CF. Then, the Daubechies wavelet coefficient that can represent the 2nd and higher order derivative values of direct current is derived. Once the wavelet coefficients of the sampling points are detected to exceed the threshold, the occurrence of CF is confirmed. Furthermore, by instantly increasing advanced firing angle β in the inverter side, an additional emergency control strategy to prevent subsequent CF is proposed. Eventually, with simulations of the benchmark model, the effectiveness and superiorities of the proposed detection method and additional control strategy in accuracy and rapidity are verified.
Tao Lin; Ziyu Guo; Liyong Wang; Rusi Chen; Ruyu Bi. Novel Detection Method for Consecutive DC Commutation Failure Based on Daubechies Wavelet with 2nd-Order Vanishing Moments. Energies 2018, 11, 261 .
AMA StyleTao Lin, Ziyu Guo, Liyong Wang, Rusi Chen, Ruyu Bi. Novel Detection Method for Consecutive DC Commutation Failure Based on Daubechies Wavelet with 2nd-Order Vanishing Moments. Energies. 2018; 11 (2):261.
Chicago/Turabian StyleTao Lin; Ziyu Guo; Liyong Wang; Rusi Chen; Ruyu Bi. 2018. "Novel Detection Method for Consecutive DC Commutation Failure Based on Daubechies Wavelet with 2nd-Order Vanishing Moments." Energies 11, no. 2: 261.
With the aid of power quality monitoring systems (PQMSs), accurate locating of voltage sag sources, which has important significance for guiding maintenance personnel in finding and repairing faults as well as improving power supply reliability, has been becoming a new research hotspot. However, existing methods have unsatisfactory locating accuracy due to the integration of distributed generators (DGs) and fault resistance. In this paper, a novel strategy for accurately locating voltage sag sources in smart distribution networks is proposed. Based on inverse theory, which is well applied in geophysics, the accurate location issue is treated as a two-step optimization model. It aims at making the distribution of voltage phasors and current phasors obtained by theoretical short-circuit calculation match those actually observed as closely as possible. To guarantee the feasibility of the strategy, the effect of inverter-interfaced DGs (IIDGs) which are the main form of DG is considered in the short-circuit calculations. To guarantee the location accuracy of the strategy, fault resistance is treated as an optimization variable in the two-step optimization model to eliminate estimation error of fault resistance. Via two modified IEEE benchmarks with different scales, the validity and the superiorities in applicability and accuracy of the proposed strategy are verified.
Rusi Chen; Tao Lin; Ruyu Bi; Xialing Xu. Novel Strategy for Accurate Locating of Voltage Sag Sources in Smart Distribution Networks with Inverter-Interfaced Distributed Generators. Energies 2017, 10, 1885 .
AMA StyleRusi Chen, Tao Lin, Ruyu Bi, Xialing Xu. Novel Strategy for Accurate Locating of Voltage Sag Sources in Smart Distribution Networks with Inverter-Interfaced Distributed Generators. Energies. 2017; 10 (11):1885.
Chicago/Turabian StyleRusi Chen; Tao Lin; Ruyu Bi; Xialing Xu. 2017. "Novel Strategy for Accurate Locating of Voltage Sag Sources in Smart Distribution Networks with Inverter-Interfaced Distributed Generators." Energies 10, no. 11: 1885.
Harmonic resonance may cause abnormal operation and even damage of power facilities, further threatening normal and safe operation of power systems. For renewable energy generations, controlled loads and parallel reactive power compensating equipment, their operating statuses can vary frequently. Therefore, the parameters of equivalent fundamental and harmonic admittance/impedance of these components exist in uncertainty, which will change the elements and eigenvalues of harmonic network admittance matrix. Consequently, harmonic resonance in power grid is becoming increasingly more complex. Hence, intense research about prevention and suppression of harmonic resonance, particularly the parameter feasible domain (PFD) which can keep away from harmonic resonance, are needed. For rapid online evaluation of PFD, a novel method without time-consuming pointwise precise eigenvalue computations is proposed. By analyzing the singularity of harmonic network admittance matrix, the explicit sufficient condition that the matrix elements should meet to prevent harmonic resonance is derived by the extended Gersgorin theorem. Further, via the non-uniqueness of similar transformation matrix (STM), a strategy to determine the appropriate STM is proposed to minimize the conservation of the obtained PFD. Eventually, the availability and advantages in computation efficiency and conservation of the method, are demonstrated through four different scale benchmarks.
Tao Lin; Rusi Chen; Guangzheng Yu; Ruyu Bi; Xialing Xu. Extended Gersgorin Theorem-Based Parameter Feasible Domain to Prevent Harmonic Resonance in Power Grid. Energies 2017, 10, 1612 .
AMA StyleTao Lin, Rusi Chen, Guangzheng Yu, Ruyu Bi, Xialing Xu. Extended Gersgorin Theorem-Based Parameter Feasible Domain to Prevent Harmonic Resonance in Power Grid. Energies. 2017; 10 (10):1612.
Chicago/Turabian StyleTao Lin; Rusi Chen; Guangzheng Yu; Ruyu Bi; Xialing Xu. 2017. "Extended Gersgorin Theorem-Based Parameter Feasible Domain to Prevent Harmonic Resonance in Power Grid." Energies 10, no. 10: 1612.
A novel scheme based on the complex atom transform (CAT) for detection of subsynchronous oscillations (SSO) is proposed in this paper. SSO components and the fundamental are closely spaced in frequency domain causing the possibility of aliasing. Some conventional SSO detection methods share the problems of low mode resolution and slow dynamic response. The CAT has flexible window in time–frequency domain. By adjusting the window of the CAT, the scheme can achieve high multi‐mode resolution, desirable accuracy and fast dynamic response when analyzing multi‐mode SSO waveforms to facilitate multi‐mode SSO suppression. First step of the scheme is to use the CAT to obtain oscillation frequencies and envelope curves of SSO waveforms. The least squares (LS) method is then deployed to measure initial oscillation amplitude and damping ratio from the envelope curve. The effectiveness and correctness of the proposed scheme are verified with simulations using both an artificially generated signal and the IEEE First Benchmark Model. Compared with the conventional methods, such as the continuous wavelet transform (CWT), the scheme has higher mode resolution, more desirable accuracy and faster dynamic response. In addition, the scheme is simple and the computation burden is low; thus, it is easy to be implemented for online application. Moreover, the CAT‐based scheme can also be used for synchrophasor measurements; hence, the scheme can be integrated into phasor measurement units (PMU), which are installed in generator terminals. Copyright © 2013 John Wiley & Sons, Ltd.
Lin Liu; Tao Lin; Xialing Xu; Guangzheng Yu; Rusi Chen. Complex atom transform-based scheme for detection of subsynchronous oscillations. International Transactions on Electrical Energy Systems 2013, 25, 233 -245.
AMA StyleLin Liu, Tao Lin, Xialing Xu, Guangzheng Yu, Rusi Chen. Complex atom transform-based scheme for detection of subsynchronous oscillations. International Transactions on Electrical Energy Systems. 2013; 25 (2):233-245.
Chicago/Turabian StyleLin Liu; Tao Lin; Xialing Xu; Guangzheng Yu; Rusi Chen. 2013. "Complex atom transform-based scheme for detection of subsynchronous oscillations." International Transactions on Electrical Energy Systems 25, no. 2: 233-245.
Based on new time frequency algorithm, a new interharmonic analysising method is raised in this paper. The number and approximate frequency of interharmonics is firstly gotten using Least-square algorithm. Then new time frequency algorithm is applied to measure the accurate frequency and magnitude of each interharmonic. The simulation indicates that this method mentioned above is able to measure frequency and magnitude of interharmonics accurately and real-timely, with the advantage of high frequency resolution and measuring precision and low calculation amount performance.
Jian Cao; Tao Lin; Lin Liu; Jia-Kai Ling; Xue-Ling Huang. Power System Interharmonics Analysis Based on new Time Frequency Algorithm. 2011 Asia-Pacific Power and Energy Engineering Conference 2011, 1 -3.
AMA StyleJian Cao, Tao Lin, Lin Liu, Jia-Kai Ling, Xue-Ling Huang. Power System Interharmonics Analysis Based on new Time Frequency Algorithm. 2011 Asia-Pacific Power and Energy Engineering Conference. 2011; ():1-3.
Chicago/Turabian StyleJian Cao; Tao Lin; Lin Liu; Jia-Kai Ling; Xue-Ling Huang. 2011. "Power System Interharmonics Analysis Based on new Time Frequency Algorithm." 2011 Asia-Pacific Power and Energy Engineering Conference , no. : 1-3.
In order to solve the problem of service restoration in distribution network based on distributed generation, this paper treated it as a multi-object nonlinear optimization problem with constrains like the type, capacity and priority of important loads. Four possible operation modes are considered in this paper, and loads are classified into three levels. Further, islanding algorithm based on a new judging method is used to check network connectivity; load shed and network reconfiguration strategies based on bacterial colony chemotaxis optimization algorithm is proposed to achieve the objectives of maximum load restoration and minimum switch action; and the flexible power flow algorithm is used to check system frequency constrain. In the end, the service restoration strategy is verified using IEEE 33-node system, and simulation results demonstrate the effectiveness of the proposed method.
Lu Zhao; Tao Lin; Yue Bi; Xialing Xu. On Service Restoration Considering Frequency Characteristics of Distributed Generation. 2011 Asia-Pacific Power and Energy Engineering Conference 2011, 1 -4.
AMA StyleLu Zhao, Tao Lin, Yue Bi, Xialing Xu. On Service Restoration Considering Frequency Characteristics of Distributed Generation. 2011 Asia-Pacific Power and Energy Engineering Conference. 2011; ():1-4.
Chicago/Turabian StyleLu Zhao; Tao Lin; Yue Bi; Xialing Xu. 2011. "On Service Restoration Considering Frequency Characteristics of Distributed Generation." 2011 Asia-Pacific Power and Energy Engineering Conference , no. : 1-4.