Chen Shao

North China Electric Power University

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Xiangwu Yan

North China Electric Power University

Weifeng Peng

North China Electric Power University

Waseem Aslam

University of Sargodha

Jiaoxin Jia

North China Electric Power University

Weilin Wu

North China Electric Power University

Weilin Wu

North China Electric Power University

Tiecheng Li

State Grid Corporation of China (China)

Zongjie Liu

Shanghai Electric (China)

Yuan Gao

The Netherlands Cancer Institute

Junda Lu

North China Electric Power University

Cooperative Institutions

North China Electric Power University

Shanghai Electric (China)

State Grid Corporation of China (China)

University of Sargodha

China Electric Power Research Institute

Shanghai Jiao Tong University

Guangxi University

Shanghai Institute of Measurement and Testing Technology

University of Chinese Academy of Sciences

Henan University of Technology

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An accurate power control strategy for electromagnetic rotary power controllers

IET Generation Transmission & Distribution (2023)

Xiangwu Yan Chen Shao Jiaoxin Jia Waseem Aslam Weifeng Peng

Abstract With the rapid development of active distribution networks, the “petal”‐type distribution network has become the mainstream power supply structure. Power control methods for active distribution networks should be further studied to ensure the safe and reliable power supply of a distribution system. An electromagnetic rotary power flow controller (RPFC) is a feasible solution for controlling power in active distribution networks. However, when testing the effectiveness of the PQ decoupled control method for RPFC based on instantaneous reactive power theory, difficulties were encountered with the synchronous control of the rotor position angle of two rotating‐phase transformers, and the accuracy of power control was unsatisfactory. Given this condition, PQ control is improved in three ways. First, the system's periodic oscillation problem is solved via variable speed control. Second, the servo motor‐rotary phase‐shifting transformer synchronous rotation scheme, which reduces power control error and improves stability, is designed. Third, the overshoot phenomenon in power control is improved using the variable‐domain fuzzy proportional‐integral adaptive method. Experimental results show that the proposed advanced control scheme exhibits good dynamic and static performance in power control scenarios and achieves effective improvement in RPFC.

10.1049/gtd2.12901

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Citations (5)

Voltage Regulation Method for Active Distribution Networks Based on Rotary Voltage Regulator

Lecture notes in electrical engineering (2024)

Xiangwu Yan Chen Shao Weifeng Peng Bingzhen Li Weilin Wu

Low-dropout regulator

10.1007/978-981-97-0877-2_35

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Citations (0)

Comprehensive Compensation Method for Co-phase Power Supply in Electrified Railways Based on V/v Transformer and Single-phase Rotating Var Compensator

Authorea (Authorea) (2024)

Xiangwu Yan Weilin Wu Chen Shao Weifeng Peng

To solve the problem of negative-sequence and reactive power in electrified railway, this paper proposes a comprehensive compensation method based on V/v transformers and electromagnetic single-phase var compensator (ESVC) for co-phase power supply. First, based on the principles of static var generator (SVG) and single-phase rotary phase shifting transformer (SRPST), the topology and model of ESVC have been established, and the compensation mechanism has been analyzed. Second, the topological structure and mathematical model of co-phase power comprehensive compensation device (CPCD) are put forward based on the principles of V/v transformers and ESVC, and the operation mode of CPCD in multiple scenarios is designed. Then the strategy of CPCD with double closed loop control is analyzed: corresponding compensation mode is selected according to negative-sequence unbalance degree and expected power factor value. In this strategy, the compensated current output by ESVC is taken as the quantity of external loop control, and the rotation angle of ESVC is taken as the quantity of internal loop control to realize double-closed loop control of CPCD. Finally, the comprehensive CPCD compensation model is built on the simulation platform and validated the accuracy of the mathematical model and the effectiveness of the control strategy.

Single phase

Three-phase

Single-phase electric power

10.22541/au.171148903.33610198/v1

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Voltage Regulation Method for a Rotary Power Flow Controller Based on the Impedance Regulation Principle

Lecture notes in electrical engineering (2024)

Xiangwu Yan Weifeng Peng Chen Shao Waseem Aslam Jiaoxin Jia

10.1007/978-981-97-1351-6_83

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Analysis and Forecast of Electricity Demand for Charging and Discharging in Jining Medium and Low Voltage Grids in the Context of Electric Vehicles in the Countryside

Gerald Gui Zongjie Liu Hongmei Wang Y.H. Song Guoming Ma

10.1109/icnepe64067.2024.10860600

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Voltage Regulation Method for a Rotary Power Flow Controller Based on the Impedance Regulation Principle

Xiangwu Yan Weifeng Peng Chen Shao Waseem Aslam Jiaoxin Jia

A rotary power flow controller (RPFC) that consists of rotary phase shifting transformers can be used for voltage regulation to address the problem of voltage crossing limit caused by high-penetration photovoltaic integration. First, this study presents an impedance dynamic adjustment model for RPFC by combining its topology and working principle. Second, a voltage control strategy based on impedance adjustment, wherein line voltage and the power factor are used as control input, is proposed. This strategy calculates the set-point values for the dq-axis components of the RPFC output voltage on the basis of the deviations of user-side voltage amplitude and line power factor. Then, it combines and converts them into two target values for rotation angles. The actual and target values of rotation angles are used to quantify the duty cycles of RPFC servomotors, achieving closed-loop coordinated control of the two rotation angles' speeds to maintain the voltage level at the user side. Finally, simulation and experimental analyses are conducted to verify the feasibility and effectiveness of the proposed scheme, including the impedance compensation characteristics of RPFC and the control of user-side voltage and the line power factor under varying voltage set points and load power disturbances.

10.2139/ssrn.4462868

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Citations (1)

Comprehensive compensation method for co‐phase power supply in electrified railways based on V/v transformer and electromagnetic single‐phase var compensator

IET Generation Transmission & Distribution (2024)

Xiangwu Yan Weilin Wu Chen Shao Weifeng Peng

Abstract To solve the problem of negative‐sequence and reactive power in electrified railway, this paper proposes a comprehensive compensation method based on V/v transformer and electromagnetic single‐phase var compensator (ESVC) for co‐phase power supply. First, based on the principles of static var generator and single‐phase rotary phase shifting transformer, the topology and model of ESVC have been established, and the compensation mechanism has been analysed. Second, the topological structure and mathematical model of co‐phase power comprehensive compensation device (CPCD) are put forward based on the principles of V/v transformer and ESVC, and the operation mode of CPCD in multiple scenarios is designed. Then the strategy of CPCD with double closed loop control is analysed: corresponding compensation mode is selected according to negative‐sequence unbalance degree and expected power factor value. In this strategy, the compensated current output by ESVC is taken as the quantity of external loop control, and the rotation angle of ESVC is taken as the quantity of internal loop control to realize double‐closed loop control of CPCD. Finally, the comprehensive CPCD compensation model is built on the simulation platform and validated the accuracy of the mathematical model and the effectiveness of the control strategy.

Single phase

Single-phase electric power

Three-phase

10.1049/gtd2.13255

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Citations (1)

Two‐stage power control method of rotary power flow controller for flexible interconnection of distribution network

IET Renewable Power Generation (2024)

Chen Shao Xiangwu Yan Abubakar Siddique Waseem Aslam Jiaoxin Jia

Abstract With the rapid development of active distribution network construction, flexible interconnected distribution networks have become the mainstream power supply structure. To ensure the safe power supply of the distribution system, power control methods suitable for flexible interconnected distribution networks should be further studied. The electromagnetic rotating power flow controller (RPFC) is a feasible solution for power control in distribution networks. This paper first constructs an RPFC steady‐state power decoupling control model based on instantaneous reactive power theory. However, it is difficult to achieve stable power control due to the difficulty of coordinated control of the rotor position angle of the rotating phase transfer transformer. On this basis, the servo motor's two‐stage speed control and speed coordination scheme are used to achieve stable and error‐free control of the two rotor angles, meeting the power regulation requirements of high precision, high reliability, and fast response. A 380 V/40 kVA RPFC prototype and experimental platform were developed, and power regulation and power equalization experiments were conducted. The results indicate that the proposed control scheme can regulate at the second level. Control accuracy is maintained within 4%, showing good dynamic and static performance. This meets the requirements for flexible closed‐loop operation in the interconnected distribution network.

Decoupling (probability)

10.1049/rpg2.13030

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Citations (1)

Multiple-Zone Synchronous Voltage Regulation and Loss Reduction Optimization of Distribution Networks Based on a Dual Rotary Phase-Shifting Transformer

Sustainability (2024)

Chen Shao Xiangwu Yan Yaohui Yang Waseem Aslam Jiaoxin Jia

For the problem in which accessing a high proportion of renewable energy results in exceeding the limit in distribution network voltage, the existing regulating method experiences difficulty in considering the two-way voltage regulation and loss reduction optimization function. This study proposes a series-type dual rotary phase-shifting transformer (DRPST) based on the principle of phase volume synthesis. This transformer exhibits bidirectional voltage regulation, high reliability, and low cost. First, the topology, operating principle, and equivalent circuit of DRPST are introduced, and its simplified circuit model is established. On the basis of this model, the causes of voltage exceeding the limits are analyzed and the active distribution network model that contains DRPST is constructed. A real-time rolling two-layer optimization strategy based on DRPST is proposed. The inner layer model is solved using the multi-objective particle swarm optimization algorithm with the objective of minimizing voltage deviation and line loss. The optimal compromise solution of the Pareto solution set of the inner layer model is determined using the fuzzy subordinate degree function method. The outer model is based on the optimal compromise solution of the inner model, and the DRPST output rotor angle is controlled without deviation through double closed-loop proportional–integral regulation. Finally, the correctness and effectiveness of the proposed topology and control method are verified via simulation and experimental analysis.

Three-phase

10.3390/su16031029

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Citations (2)

An accurate power control strategy for electromagnetic rotary power controllers

Authorea (Authorea) (2023)

Xiangwu Yan Chen Shao Jiaoxin Jia Waseem Aslam Weifeng Peng

With the rapid development of active distribution networks, the “petal”-type distribution network has become the mainstream power supply structure. To ensure the safe and reliable power supply of a distribution system, power control methods for active distribution networks should be further studied. An electromagnetic rotary power flow controller (RPFC) is a feasible solution for active distribution network power control. However, when testing the effectiveness of the PQ decoupled control method for RPFC based on instantaneous reactive power theory, difficulties were encountered with the synchronous control of the rotor position angle of two rotating-phase transformers, and the accuracy of power control was unsatisfactory. Given this condition, PQ control is improved in three ways. First, the system periodic oscillation problem is solved via variable speed control. Second, the servo motor–rotary phase-shifting transformer synchronous rotation scheme is designed, reducing power control error and improving stability. The overshoot phenomenon in power control is improved using the variable domain fuzzy proportional–integral adaptive method. Experimental results show that the proposed advanced control scheme exhibits good dynamic and static performance in power control scenarios and achieves effective improvement of RPFC.

10.22541/au.167347081.15068192/v1

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Citations (1)