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Low-voltage multi-terminal DC system is one of the important forms in distribution network. Its stability issue has drawn worldwide attention for the characteristics of low inertia and weak damping. This paper aims to analyze the interactive behavior between the voltage source converter (VSC) and the oscillation mode of the DC network. First, this paper proposed a modeling method for DC voltage control loop considering the time-lag effect of inductor energy storage behavior on the AC side of the VSC. Based on this model, the interactive behavior between VSC and DC network including the influence of droop coefficients and load power under DC voltage-AC power (Vdc-Pac) droop control mode and under DC voltage-DC power (Vdc-Pdc) droop control mode is studied. Then, the overall state-space model of the system is established. Furthermore, the stability of a low-voltage three-terminal DC system under different control modes and parameters is compared and detailed analyzed. Finally, the corresponding simulation and experimental verification validate the theoretical analysis. The research results show that under the same capacity and control parameters, Vdc-Pac mode can better improve the capability of power regulation and system stability. This research can provide an effective method for system control modes design.
Wei Deng; Wei Pei; Qi Wu; Ying Zhuang. Analysis of Interactive Behavior and Stability of Low Voltage Multi-terminal DC System Under Droop Control Modes. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.
AMA StyleWei Deng, Wei Pei, Qi Wu, Ying Zhuang. Analysis of Interactive Behavior and Stability of Low Voltage Multi-terminal DC System Under Droop Control Modes. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.
Chicago/Turabian StyleWei Deng; Wei Pei; Qi Wu; Ying Zhuang. 2021. "Analysis of Interactive Behavior and Stability of Low Voltage Multi-terminal DC System Under Droop Control Modes." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.
AC/DC hybrid power supply will become an important form of power distribution in the future. Its simulation is the indispensable mean for AC/DC power system research and related equipment/system development. This paper proposes a concept of AC/DC power system simulator, expounds the digital simulation platform and physical testing platform. Based on this, the paper focuses on the physical testing platform, and proposes corresponding simulation schemes including AC/DC flexible interconnection simulation, DC/DC flexible access simulation, and coordinated operation strategy. The corresponding tests reveal the effectiveness and feasibility of AC/DC power system simulator.
Wei Deng; Wei Pei; Xue Zhang; Qi Wu; Li Kong. Research on AC/DC power system simulator. Energy Reports 2021, 7, 403 -410.
AMA StyleWei Deng, Wei Pei, Xue Zhang, Qi Wu, Li Kong. Research on AC/DC power system simulator. Energy Reports. 2021; 7 ():403-410.
Chicago/Turabian StyleWei Deng; Wei Pei; Xue Zhang; Qi Wu; Li Kong. 2021. "Research on AC/DC power system simulator." Energy Reports 7, no. : 403-410.
By integrating the increasing number of electric vehicles (EVs) in the existing multi‐terminal DC system, the new power lines construct can be reduced and the investment in distribution power equipment can be saved. The integration of EVs will affect the power transfer boundary of the system in a certain extent. It is necessary to ensure the normal performance of the system and the power supply for the EVs through the optimal configuration of system integration. The paper proposes the state‐space model of the low‐voltage multi‐terminal DC system is constructed, then the influence of EVs integration on the system power transfer boundary and the sensitivity of the power transfer boundary under the change of integration parameters are analysed. Furthermore, an optimization method of EVs integration configuration considering the investment cost is proposed, which takes minimizing the system integration cost as the optimization goal and adopts the genetic algorithm for optimization solving. Finally, through the case verification and simulation analysis, the effectiveness of the method is verified, which can minimize system integration cost and ensure the power supply for EVs, without affecting the system power transfer boundary.
Wei Deng; Wei Pei; Ying Zhuang; Li Kong; Qiang Li; Yubo Yuan. Integration parameters optimization of low‐voltage multi‐terminal DC system under access of electric vehicles. IET Smart Grid 2021, 4, 76 -93.
AMA StyleWei Deng, Wei Pei, Ying Zhuang, Li Kong, Qiang Li, Yubo Yuan. Integration parameters optimization of low‐voltage multi‐terminal DC system under access of electric vehicles. IET Smart Grid. 2021; 4 (1):76-93.
Chicago/Turabian StyleWei Deng; Wei Pei; Ying Zhuang; Li Kong; Qiang Li; Yubo Yuan. 2021. "Integration parameters optimization of low‐voltage multi‐terminal DC system under access of electric vehicles." IET Smart Grid 4, no. 1: 76-93.
The multi-terminal AC/DC system will become one of the important forms of the future power grid. The negative impedance characteristic caused by the constant power load in the DC network will reduce the power transfer capacity between the terminals, especially when a grid fault occurs in AC system at any terminal. Energy storage has played an important role in improving the stability of AC and DC systems. This paper proposes an additional control method based on an energy storage system to improve system power transfer capacity with low cost. The state space model of two-terminal AC/DC system is established, and the feedback laws for additional control are further designed by Lyapunov theory. Furthermore, the additional control strategies based on the energy storage system is built, without changing the existing control system of each control object. Finally, the corresponding system simulation model is established by Matlab/Simulink for analysis and verification. The research results show that the proposed additional control method is effective. The power transfer limitation can be overcome by only adding small damping energy with the stable DC voltages under large disturbances, and the power transfer capacity between the terminals can be significantly improved with low control cost.
Zheng Wu; Laifu Li; Yubo Yuan; Xiaodong Yuan; Chenyu Zhang; Li Kong; Wei Pei; Wei Deng; Yuan. Research on Additional Control Technology Based on Energy Storage System for Improving Power Transfer Capacity of Multi-Terminal AC/DC System with Low Cost. Energies 2020, 13, 495 .
AMA StyleZheng Wu, Laifu Li, Yubo Yuan, Xiaodong Yuan, Chenyu Zhang, Li Kong, Wei Pei, Wei Deng, Yuan. Research on Additional Control Technology Based on Energy Storage System for Improving Power Transfer Capacity of Multi-Terminal AC/DC System with Low Cost. Energies. 2020; 13 (2):495.
Chicago/Turabian StyleZheng Wu; Laifu Li; Yubo Yuan; Xiaodong Yuan; Chenyu Zhang; Li Kong; Wei Pei; Wei Deng; Yuan. 2020. "Research on Additional Control Technology Based on Energy Storage System for Improving Power Transfer Capacity of Multi-Terminal AC/DC System with Low Cost." Energies 13, no. 2: 495.
It is known that if AC/DC converter power exceeds limit it may lead to instability of DC network, especially DC voltage, and further affects the whole system. Concerning the instability risk in coordinated control, this study proposes a stabilisation method allowing large signal stability to stabilise a low voltage multi-terminal AC/DC hybrid system. The equivalent model of electric system is studied firstly. Then, an active stabiliser based on Lyapunov theory, and the stabilising feedback law, are proposed. Finally, a study case is built using MATLAB/Simulink, and the feasibility is verified.
Wei Deng; Wei Pei; Luyang Li; Li Kong. General active stabiliser for coordinated control of low voltage multi‐terminal AC/DC hybrid system. The Journal of Engineering 2019, 2019, 8282 -8286.
AMA StyleWei Deng, Wei Pei, Luyang Li, Li Kong. General active stabiliser for coordinated control of low voltage multi‐terminal AC/DC hybrid system. The Journal of Engineering. 2019; 2019 (11):8282-8286.
Chicago/Turabian StyleWei Deng; Wei Pei; Luyang Li; Li Kong. 2019. "General active stabiliser for coordinated control of low voltage multi‐terminal AC/DC hybrid system." The Journal of Engineering 2019, no. 11: 8282-8286.
The operation modes and coordinated control strategies are the key technologies to ensure the efficient and reliable operation of low voltage AC/DC distribution system. Firstly, the typical system operation modes are analysed in this paper. Secondly, the coordinated control strategies between AC/DC converter, DC/DC converter, and other units under different operation modes are proposed. Finally, the proposed coordinated control strategies are studied by simulation model, and their feasibility and effectiveness are verified.
Wei Deng; Wei Pei. Typical Operation Modes and Coordinated Control of Low Voltage AC/DC Distribution Based on DC Interconnection. Energy Procedia 2018, 145, 26 -31.
AMA StyleWei Deng, Wei Pei. Typical Operation Modes and Coordinated Control of Low Voltage AC/DC Distribution Based on DC Interconnection. Energy Procedia. 2018; 145 ():26-31.
Chicago/Turabian StyleWei Deng; Wei Pei. 2018. "Typical Operation Modes and Coordinated Control of Low Voltage AC/DC Distribution Based on DC Interconnection." Energy Procedia 145, no. : 26-31.
Multi-terminal AC/DC interconnection will be an important form of future distribution networks. In a multi-terminal AC/DC system, if scheduled power for the AC/DC converter exceeds limits this may result in instability of the DC network. In order to overcome these limitations and avoid an unstable situation during coordinated control, this paper proposes a general active stabilization method for a low-voltage multi-terminal AC/DC hybrid system. First, the typical coordinated control modes for a hybrid system are analyzed. Second, a multi-level active stabilization controller, using the Lyapunov method, is introduced, and a feedback law allowing large signal stability is proposed. Finally, a system simulation model is further established, and the proposed active stabilization method is tested and verified. Study results show that only low stabilizing power with a slight influence on the DC network dynamic can improve the system’s stability and ensure stable system voltage.
Wei Deng; Wei Pei; Luyang Li. Active Stabilization Control of Multi-Terminal AC/DC Hybrid System Based on Flexible Low-Voltage DC Power Distribution. Energies 2018, 11, 502 .
AMA StyleWei Deng, Wei Pei, Luyang Li. Active Stabilization Control of Multi-Terminal AC/DC Hybrid System Based on Flexible Low-Voltage DC Power Distribution. Energies. 2018; 11 (3):502.
Chicago/Turabian StyleWei Deng; Wei Pei; Luyang Li. 2018. "Active Stabilization Control of Multi-Terminal AC/DC Hybrid System Based on Flexible Low-Voltage DC Power Distribution." Energies 11, no. 3: 502.
Automatically identifying the new equipment after its integration and adjusting operation strategy to realize “plug and play” functionality are becoming essential for micro-grid operations. In order to improve and perfect the micro-grid “plug and play” function with the increased amount of equipment with different information protocols and more diverse system applications, this paper presents a solution for adaptive micro-grid operation based on IEC 61850, and proposes the design and specific implementation methods of micro-grid “plug and play” function and system operation mode conversion in detail, by using the established IEC 61850 information model of a micro-grid. Actual operation tests based on the developed IED and micro-grid test platform are performed to verify the feasibility and validity of the proposed solution. The tests results show that the solution can automatically identify the IEC 61850 information model of equipment after its integration, intelligently adjust the operation strategies to adapt to new system states and achieves a reliable system operation mode conversion.
Wei Deng; Wei Pei; Ziqi Shen; Zhenxing Zhao; Hui Qu. Adaptive Micro-Grid Operation Based on IEC 61850. Energies 2015, 8, 4455 -4475.
AMA StyleWei Deng, Wei Pei, Ziqi Shen, Zhenxing Zhao, Hui Qu. Adaptive Micro-Grid Operation Based on IEC 61850. Energies. 2015; 8 (5):4455-4475.
Chicago/Turabian StyleWei Deng; Wei Pei; Ziqi Shen; Zhenxing Zhao; Hui Qu. 2015. "Adaptive Micro-Grid Operation Based on IEC 61850." Energies 8, no. 5: 4455-4475.
This chapter introduces an energy management terminal (EMT) designed for a microgrid. The EMT acts as a central online control and monitor unit in the microgrid. It can acquire parameters of measuring points in the microgrid regularly by communicating with other terminals or measuring instruments installed in the measuring points all over the microgrid. The EMT is developed in embedded system based on ARM micro processor. The software is programmed by C++ with QT programming language for computation and GUI display. The EMT is used in one of the smart grid demonstration project and proved to be useful.
Luo Yan; Deng Wei; Pei Wei. Design of Energy Management Terminal in Microgrid. Lecture Notes in Electrical Engineering 2012, 138, 1087 -1094.
AMA StyleLuo Yan, Deng Wei, Pei Wei. Design of Energy Management Terminal in Microgrid. Lecture Notes in Electrical Engineering. 2012; 138 ():1087-1094.
Chicago/Turabian StyleLuo Yan; Deng Wei; Pei Wei. 2012. "Design of Energy Management Terminal in Microgrid." Lecture Notes in Electrical Engineering 138, no. : 1087-1094.
This paper presents the design and realization of data acquisition, communication and monitoring system for photovoltaic power station. The data acquisition module including filter algorithm and signal modulation circuit uses the digital signal processor (DSP) as the main processor, it can realize accurate real-time data acquisition; The data communication module uses Ethernet as communication network between PV system and MicroGrid. The gateway using ARM microprocessor can realize protocol conversion and bidirectional communication between CAN Bus and Ethernet; The monitoring unit with friendly human-machine interface keeps real-time performance monitoring of PV system to realize automation control. The results of experiment show that the system is practicable and effective.
Wei Deng; Wei Pei; Zhiping Qi; Li Kong. Design and Implementation of Data Acquisition, Communication and Monitoring System for Photovoltaic Power Station in Microgrid. Proceedings of ISES World Congress 2007 (Vol. I – Vol. V) 2008, 1538 -1542.
AMA StyleWei Deng, Wei Pei, Zhiping Qi, Li Kong. Design and Implementation of Data Acquisition, Communication and Monitoring System for Photovoltaic Power Station in Microgrid. Proceedings of ISES World Congress 2007 (Vol. I – Vol. V). 2008; ():1538-1542.
Chicago/Turabian StyleWei Deng; Wei Pei; Zhiping Qi; Li Kong. 2008. "Design and Implementation of Data Acquisition, Communication and Monitoring System for Photovoltaic Power Station in Microgrid." Proceedings of ISES World Congress 2007 (Vol. I – Vol. V) , no. : 1538-1542.