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During the heating season in the “Three North” area of China, the wind curtailment has become a serious problem due to the lack of space for grid-connected wind power. Firstly, from the perspective of improving the acceptance capacity of wind power curtailment, this paper establishes a model of hybrid energy storage. Then considering the influence of the frequently changing electrodes of the regenerative electric boiler on its working life, this paper introduces the optimization coefficient of electrodes, and the optimal operation strategy of hybrid energy storage system is put forward. Finally, based on the actual data of 200 MW wind farm, this paper compares and analyzes the advantages and disadvantages of different control methods. The results show that the proposed method can further improve the power system's ability to accept wind power, under the requirements of meeting the heating demand and reducing the number of electrode adjustment of electric boilers.
Junhui Li; Yingnan Fu; Cuiping Li; Jiang Li; Zhitong Xing; Teng Ma. Improving wind power integration by regenerative electric boiler and battery energy storage device. International Journal of Electrical Power & Energy Systems 2021, 131, 107039 .
AMA StyleJunhui Li, Yingnan Fu, Cuiping Li, Jiang Li, Zhitong Xing, Teng Ma. Improving wind power integration by regenerative electric boiler and battery energy storage device. International Journal of Electrical Power & Energy Systems. 2021; 131 ():107039.
Chicago/Turabian StyleJunhui Li; Yingnan Fu; Cuiping Li; Jiang Li; Zhitong Xing; Teng Ma. 2021. "Improving wind power integration by regenerative electric boiler and battery energy storage device." International Journal of Electrical Power & Energy Systems 131, no. : 107039.
Large‐scale wind power integrated the power system may result in a challenge for frequency regulation because of the variable nature of wind. Energy storage system (ESS) is an effective measure against the challenge of frequency regulation caused by wind power. Aiming to solve the problem that the response time of traditional turbines can hardly meet frequency regulation demand, this article proposes a strategy for ESS which can adaptively adjust the output coefficient of ESS according its state of charge (SOC). And the relationship between the frequency regulation effect and the size of ESS is established. Firstly, the reference power of ESS is obtained based on fuzzy theory. Secondly, the principle of giving priority to ESS is adopted, and the actual output is determined according to the SOC. Finally, the output of the thermal power unit is determined based on the penalty power of ESS. The case analyzed shows that the proposed strategy has a significant effect on the improvement of the frequency deviation and the CPS1, and the maintenance of SOC. Moreover, it is shown that the 100 MW/50 MWh ESS can increase the CPS1 index by 57.1% in response to the AGC frequency regulation.
Junhui Li; Zhuo Gao; Gang Mu; Xingkai Fan; Zheshen Zhang; Jiajun Zou. Research on the control strategy of energy storage participation in power system frequency regulation. International Transactions on Electrical Energy Systems 2020, 30, 1 .
AMA StyleJunhui Li, Zhuo Gao, Gang Mu, Xingkai Fan, Zheshen Zhang, Jiajun Zou. Research on the control strategy of energy storage participation in power system frequency regulation. International Transactions on Electrical Energy Systems. 2020; 30 (12):1.
Chicago/Turabian StyleJunhui Li; Zhuo Gao; Gang Mu; Xingkai Fan; Zheshen Zhang; Jiajun Zou. 2020. "Research on the control strategy of energy storage participation in power system frequency regulation." International Transactions on Electrical Energy Systems 30, no. 12: 1.
In order to make full use of the photovoltaic (PV) resources and solve the inherent problems of PV generation systems, a capacity optimization configuration method of photovoltaic and energy storage hybrid system considering the whole life cycle economic optimization method was established. Firstly, this paper established models for various of revenues and costs, and establish the capacity allocation model of the photovoltaic and energy storage hybrid system considering the constraints of energy storage system (ESS) charge and discharge power. Secondly, the control strategy of the ESS was designed for the capacity allocation model, including ESS action timing judgment and operation mode selection based on the time-of-use electricity price, which ensures a high degree of matching between the control strategy and the capacity allocation. Finally, Particle swarm optimization was used to solve the capacity optimization configuration model of the photovoltaic and energy storage hybrid system to obtain the optimal configuration of the system. In the calculation example, the characteristics and economics of various PV panels and energy storage cells are compared, and the effects of different ESS on capacity allocation and the impact of different types of income on economics are analyzed, and get the optimal configuration scheme of the PV and ESS hybrid system. The results of calculation examples show that with the capacity allocation method proposed in this paper, the benefit of the photovoltaic and energy storage hybrid system is 1.36 times as its investment cost, and the economic benefits brought by energy conservation and emission reduction account for 22.5% of the total revenue. This means that the economic efficiency can be significantly improved while ensuring the demand of the supply load. At the same time, it has a guiding effect on the capacity allocation of PV energy storage power station.
Junhui Li; Zheshen Zhang; Baoxing Shen; Zhuo Gao; Dexuan Ma; Pengcheng Yue; Junliang Pan. The capacity allocation method of photovoltaic and energy storage hybrid system considering the whole life cycle. Journal of Cleaner Production 2020, 275, 122902 .
AMA StyleJunhui Li, Zheshen Zhang, Baoxing Shen, Zhuo Gao, Dexuan Ma, Pengcheng Yue, Junliang Pan. The capacity allocation method of photovoltaic and energy storage hybrid system considering the whole life cycle. Journal of Cleaner Production. 2020; 275 ():122902.
Chicago/Turabian StyleJunhui Li; Zheshen Zhang; Baoxing Shen; Zhuo Gao; Dexuan Ma; Pengcheng Yue; Junliang Pan. 2020. "The capacity allocation method of photovoltaic and energy storage hybrid system considering the whole life cycle." Journal of Cleaner Production 275, no. : 122902.
Large-scale battery energy storage is an inevitable trend in energy storage development. The large-scale all-vanadium liquid-flow battery energy storage system contains a large number of battery energy storage units. Current operation methods usually study large-scale energy storage as an equivalent model. There is a lack of optimization for the operation of modular energy storage units. Efficient and stable operation of large-scale energy storage needs to coordinate the operation of various energy storage units. A battery simulation model was built according to the working mechanism and external characteristics of the vanadium redox battery (VRB). Based on the simulation model, the voltage and current loss characteristics of the vanadium redox battery under the rated power charging and discharging mode were studied. Based on the model, the change in charging and discharging efficiency under different powers is measured. The power–efficiency coupling relationship is studied. The power–efficiency coupling relationship provides the basis for power allocation with the aim of optimizing efficiency. Then, combining the structure of the large-scale vanadium redox battery energy storage system and the power–efficiency coupling relationship, a large-scale energy storage system efficiency mathematical model is constructed. In a peak shaving scenario, aiming at optimizing the efficiency of the energy storage system and according to the efficiency mathematical model of the large-scale energy storage system, a coordinated and optimized operation strategy of the energy storage module is proposed. This module improves the efficiency of the energy storage system.
Junhui Li; Dacheng Hu; Gang Mu; Shuai Wang; Zheshen Zhang; Xiaochi Zhang; Xiangyu Lv; Dexin Li; Jiarui Wang. Optimal control strategy for large-scale VRB energy storage auxiliary power system in peak shaving. International Journal of Electrical Power & Energy Systems 2020, 120, 106007 .
AMA StyleJunhui Li, Dacheng Hu, Gang Mu, Shuai Wang, Zheshen Zhang, Xiaochi Zhang, Xiangyu Lv, Dexin Li, Jiarui Wang. Optimal control strategy for large-scale VRB energy storage auxiliary power system in peak shaving. International Journal of Electrical Power & Energy Systems. 2020; 120 ():106007.
Chicago/Turabian StyleJunhui Li; Dacheng Hu; Gang Mu; Shuai Wang; Zheshen Zhang; Xiaochi Zhang; Xiangyu Lv; Dexin Li; Jiarui Wang. 2020. "Optimal control strategy for large-scale VRB energy storage auxiliary power system in peak shaving." International Journal of Electrical Power & Energy Systems 120, no. : 106007.
With the rapid growth of installed capacity of photovoltaic (PV), the PV power stations equipped with energy storage (ES) have become a new type of black-start power supply. Taking the Photovoltaic-Battery Energy Storage Systems (PV-BESS) as the black-start power source can improve the black-start ability of the regional power grid and broaden the application prospect of PV power generation. In this paper, a stratified optimization strategy for black-start of PV-BESS is proposed, which combines the key issues in the process of black-start of PV-BESS. Stratified optimization strategy is divided into data analysis layer, optimization coordination layer and scheduling control layer. The data analysis layer combines the requirements of the black-start process. Firstly, the similarity matrix ranking method is used to improve the PV power prediction method. Secondly, based on probability inclination, the PV power index is designed to evaluate the feasibility of black-start by calculating the PV lower limit power and the executable probability inclination. The optimization coordination layer is based on the state space model of black-start of PV-BESS, combined with the control strategy of PV as the main part and ES as the auxiliary part, the optimization objectives of the maximum utilization rate of PV and tracking the ideal value of state of charge (SOC) of ES is formulated. The optimal model is solved by model predictive control, and the output power of PV and ES is controlled to complete the black-start process. The actual historical data in the power grid with a high proportion of PV sources are used as the basic data for simulation. The simulation of black-start based on MATLAB/Simulink verifies the rationality of the stratified optimization strategy, which provides a reference for the realization of black-start of PV-BESS.
Junhui Li; Hongfei You; Jun Qi; Ming Kong; Shining Zhang; Hongguang Zhang. Stratified Optimization Strategy Used for Restoration With Photovoltaic-Battery Energy Storage Systems as Black-Start Resources. IEEE Access 2019, 7, 127339 -127352.
AMA StyleJunhui Li, Hongfei You, Jun Qi, Ming Kong, Shining Zhang, Hongguang Zhang. Stratified Optimization Strategy Used for Restoration With Photovoltaic-Battery Energy Storage Systems as Black-Start Resources. IEEE Access. 2019; 7 (99):127339-127352.
Chicago/Turabian StyleJunhui Li; Hongfei You; Jun Qi; Ming Kong; Shining Zhang; Hongguang Zhang. 2019. "Stratified Optimization Strategy Used for Restoration With Photovoltaic-Battery Energy Storage Systems as Black-Start Resources." IEEE Access 7, no. 99: 127339-127352.
Due to its own volatility and intermittentness, wind power has increased the burden on the power system after the grid connection, which has a serious impact on its safe operation. Considering the parallel and serial control strategy adopted by traditional-wind storage system, and taking into account the economy and the effect of primary frequency modulation, this paper puts forward an optimal control strategy for comprehensive utilization of energy storage system (ESS). Finally, a comprehensive evaluation method for the energy storage system to participate in the primary frequency modulation of the power grid is proposed. And in the current domestic frequency modulation market, the evaluation method is used to verify that the optimal control strategy has the best frequency modulation performance.
Junhui Li; Yunbao Ma; Gang Mu; Jun Qi; Zheshen Zhang; Dacheng Hu; Jiajun Zou. Design and Evaluation of Primary Frequency Modulation Control Strategy for Wind-Storage Combined System. Lecture Notes in Electrical Engineering 2019, 259 -270.
AMA StyleJunhui Li, Yunbao Ma, Gang Mu, Jun Qi, Zheshen Zhang, Dacheng Hu, Jiajun Zou. Design and Evaluation of Primary Frequency Modulation Control Strategy for Wind-Storage Combined System. Lecture Notes in Electrical Engineering. 2019; ():259-270.
Chicago/Turabian StyleJunhui Li; Yunbao Ma; Gang Mu; Jun Qi; Zheshen Zhang; Dacheng Hu; Jiajun Zou. 2019. "Design and Evaluation of Primary Frequency Modulation Control Strategy for Wind-Storage Combined System." Lecture Notes in Electrical Engineering , no. : 259-270.
Wind curtailment of power grid is severe during heating period in the `Three North'(northwest china, north china, and northeast china) area of China, and the `wind-heat conflict' causes insufficient of power system peaking, which is one of the main reasons that impacts wind power consumption. To enhancing flexibility of power system by configuring flexible load is an effective means to improving wind power acceptance. This paper, based on the dispatch of the cogeneration unit, analyzed the composition and operation rules of battery energy storage-heat storage system. Considering the constraints of power system and thermal system, the coordinative dispatching model of battery energy storage and regenerative electric boiler is established. Based on a regional power grid in the `Three North' area of China is used to simulate the acceptance of wind power under different modes of operation. The results show that in the way of power alternative, the regenerative electric boiler has the best effect of eliminating wind and abandoning wind, and the environmental benefits are obvious. When the thermal storage electric boiler is matched with an excessively large new adding heat load, the thermal power unit in the electric power for heating accounts for a relatively high amount of electricity, and the efficiency of energy utilization is low. Considering the battery storage price is greatly reduced, the peak shaving effect of battery energy storage and thermal storage electric boiler coordinated operation is the most obvious, and it is of great significance for the safe and stable operation of wind power and high-wind power infiltration grid.
Junhui Li; Yingnan Fu; Zhitong Xing; Xiaochi Zhang; Zhiyun Zhang; Xingkai Fan. Coordination Scheduling Model of Multi-Type Flexible Load for Increasing Wind Power Utilization. IEEE Access 2019, 7, 105840 -105850.
AMA StyleJunhui Li, Yingnan Fu, Zhitong Xing, Xiaochi Zhang, Zhiyun Zhang, Xingkai Fan. Coordination Scheduling Model of Multi-Type Flexible Load for Increasing Wind Power Utilization. IEEE Access. 2019; 7 ():105840-105850.
Chicago/Turabian StyleJunhui Li; Yingnan Fu; Zhitong Xing; Xiaochi Zhang; Zhiyun Zhang; Xingkai Fan. 2019. "Coordination Scheduling Model of Multi-Type Flexible Load for Increasing Wind Power Utilization." IEEE Access 7, no. : 105840-105850.
With the increasing participation of wind generation in the power system, a wind power plant (WPP) with an energy storage system (ESS) has become one of the options available for a black-start power source. In this article, a method for the energy storage configuration used for black-start is proposed. First, the energy storage capacity for starting a single turbine was determined. Then, a hierarchical planning model was established. This model did not consider the starting efficiency of the WPP, but it did consider the layout of the energy storage in the WPP and the balance of the terminal voltage when starting the WPP. Finally, the feasibility and value of the proposed method and model were verified in a 49.5 MW WPP with an ESS (a power rating of 2.24 MW and energy capacity of about 1.68 MWh). The result suggests that configuring an ESS with a small capacity on the side of the turbine can achieve black-start for a WPP with an ESS as the power source.
Cuiping Li; Shining Zhang; Jiaxing Zhang; Jun Qi; Junhui Li; Qi Guo; Hongfei You. Method for the Energy Storage Configuration of Wind Power Plants with Energy Storage Systems used for Black-Start. Energies 2018, 11, 3394 .
AMA StyleCuiping Li, Shining Zhang, Jiaxing Zhang, Jun Qi, Junhui Li, Qi Guo, Hongfei You. Method for the Energy Storage Configuration of Wind Power Plants with Energy Storage Systems used for Black-Start. Energies. 2018; 11 (12):3394.
Chicago/Turabian StyleCuiping Li; Shining Zhang; Jiaxing Zhang; Jun Qi; Junhui Li; Qi Guo; Hongfei You. 2018. "Method for the Energy Storage Configuration of Wind Power Plants with Energy Storage Systems used for Black-Start." Energies 11, no. 12: 3394.
Improving the safety and stability of power systems by adjusting the controllable load to improve the wind power integration has become a hot research topic. However, the methodology of accurately controlling the load and fundamentally improving the wind power integration capacity has yet to be studied. Therefore, this paper proposes an intelligent regulation method for a controllable load. This method takes the new energy consumption assessment as feedback, and it combines the wind power acceptance assessment and scheduling plan to form the internal and external loop control structure, and it derives the controllable load intelligent regulation architecture. The load curve is decomposed by an interactive load observer, and the load curve is adjusted by the interactive load controller according to a given standard, thereby improving the new energy acceptance capability. Finally, based on the actual grid operation data of a provincial power grid in Northeastern China, the source grid load balancing process and the interactive load regulation model of the wind power system are simulated. The above method verifies the validity and rationality of the proposed method.
Jia-Jue Li; Bao-Zhu Shao; Jun-Hui Li; Wei-Chun Ge; Jia-Hui Zhang; Heng-Yu Zhou. Intelligent Regulation Method for a Controllable Load Used for Improving Wind Power Integration. Energies 2018, 11, 3085 .
AMA StyleJia-Jue Li, Bao-Zhu Shao, Jun-Hui Li, Wei-Chun Ge, Jia-Hui Zhang, Heng-Yu Zhou. Intelligent Regulation Method for a Controllable Load Used for Improving Wind Power Integration. Energies. 2018; 11 (11):3085.
Chicago/Turabian StyleJia-Jue Li; Bao-Zhu Shao; Jun-Hui Li; Wei-Chun Ge; Jia-Hui Zhang; Heng-Yu Zhou. 2018. "Intelligent Regulation Method for a Controllable Load Used for Improving Wind Power Integration." Energies 11, no. 11: 3085.
Large scale wind power integration has a negative influence on the frequency response. Assistant measurement improves the frequency stability of power systems under high wind penetration. The Proportional Curtailment Strategy (PCS) for wind turbines provides a primary frequency reserve for power systems. To solve the worthless curtailed wind power, the PCS is used to improve the utilization of wind power curtailment. Then the wind turbine and the lithium battery Energy Storage System (ESS) provide primary frequency reserves together. Different control strategies of ESS have been proposed based on the different methods for selecting valid reserves. The economic benefits of different control strategies have been compared based on the same frequency regulation reserve. The optimal control strategy is the maximum method. The economic benefit of the maximum value method is ¥4,445,300.
Junhui Li; Yunbao Ma; Gang Mu; Xichao Feng; Gangui Yan; Gan Guo; Tianyang Zhang. Optimal Configuration of Energy Storage System Coordinating Wind Turbine to Participate Power System Primary Frequency Regulation. Energies 2018, 11, 1396 .
AMA StyleJunhui Li, Yunbao Ma, Gang Mu, Xichao Feng, Gangui Yan, Gan Guo, Tianyang Zhang. Optimal Configuration of Energy Storage System Coordinating Wind Turbine to Participate Power System Primary Frequency Regulation. Energies. 2018; 11 (6):1396.
Chicago/Turabian StyleJunhui Li; Yunbao Ma; Gang Mu; Xichao Feng; Gangui Yan; Gan Guo; Tianyang Zhang. 2018. "Optimal Configuration of Energy Storage System Coordinating Wind Turbine to Participate Power System Primary Frequency Regulation." Energies 11, no. 6: 1396.
Modeling and state of charge (SOC) estimation of Lithium cells are crucial techniques of the lithium battery management system. The modeling is extremely complicated as the operating status of lithium battery is affected by temperature, current, cycle number, discharge depth and other factors. This paper studies the modeling of lithium iron phosphate battery based on the Thevenin’s equivalent circuit and a method to identify the open circuit voltage, resistance and capacitance in the model is proposed. To improve the accuracy of the lithium battery model, a capacity estimation algorithm considering the capacity loss during the battery’s life cycle. In addition, this paper solves the SOC estimation issue of the lithium battery caused by the uncertain noise using the extended Kalman filtering (EKF) algorithm. A simulation model of actual lithium batteries is designed in Matlab/Simulink and the simulation results verify the accuracy of the model under different operating modes.
Junhui Li; Fengjie Gao; Gangui Yan; Tianyang Zhang; Jianlin Li. Modeling and SOC estimation of lithium iron phosphate battery considering capacity loss. Protection and Control of Modern Power Systems 2018, 3, 5 .
AMA StyleJunhui Li, Fengjie Gao, Gangui Yan, Tianyang Zhang, Jianlin Li. Modeling and SOC estimation of lithium iron phosphate battery considering capacity loss. Protection and Control of Modern Power Systems. 2018; 3 (1):5.
Chicago/Turabian StyleJunhui Li; Fengjie Gao; Gangui Yan; Tianyang Zhang; Jianlin Li. 2018. "Modeling and SOC estimation of lithium iron phosphate battery considering capacity loss." Protection and Control of Modern Power Systems 3, no. 1: 5.
In this paper we described the structure and working principle of an interruption generator based on voltage source converters (VSCs). The main circuit parameters of the VSCs are determined according to the target of power transfer capability, harmonic suppression, and dynamic response capability. A state feedback linearization method in nonlinear differential geometry theory was used for dq axis current decoupling, based on the mathematical model used in the dq coordinate system of VSCs. The direct current control strategy was adopted to achieve the independent regulation of active power and reactive power. The proportional integral (PI) link was used to optimize the dynamic performance of the controller, and PI parameters were adjusted. Disturbance voltage waves were generated by the regular sampling method. PSCAD/EMTDC simulation results and physical prototype experiments showed that the device could generate various disturbance voltage waveforms steadily, and had good dynamic and steady-state performance.
Junhui Li; Tianyang Zhang; Lei Qi; Gangui Yan. A Method for the Realization of an Interruption Generator Based on Voltage Source Converters. Energies 2017, 10, 1642 .
AMA StyleJunhui Li, Tianyang Zhang, Lei Qi, Gangui Yan. A Method for the Realization of an Interruption Generator Based on Voltage Source Converters. Energies. 2017; 10 (10):1642.
Chicago/Turabian StyleJunhui Li; Tianyang Zhang; Lei Qi; Gangui Yan. 2017. "A Method for the Realization of an Interruption Generator Based on Voltage Source Converters." Energies 10, no. 10: 1642.