Fault Ride-through Control Strategy of Modular Multilevel Matrix Converter for Fractional Frequency Transmission System

被引：0
|
作者：
Sun Y. [1 ]
Wang T. [1 ]
Fu C. [1 ]
Guo F. [2 ]
Ni Q. [3 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding
[2] Taizhou Power Supply Company, State Grid Zhejiang Electric Power Company, Taizhou
[3] Quzhou Power Supply Company, State Grid Zhejiang Electric Power Co., Ltd., Hangzhou
来源：
Gaodianya Jishu/High Voltage Engineering | 2023年 / 49卷 / 01期
关键词：
fault ride-through control; FFTS; fractional frequency transmission system; M3C; modular multilevel matrix converters; offshore wind power; power control;
D O I：
10.13336/j.1003-6520.hve.20220288
中图分类号：
学科分类号：
摘要：
The fault ride-through of modular multilevel matrix converters (M3C), as an important device of fractional frequency transmission system (FFTS) technology for offshore wind power, is one of important issues on the safe and stable operation for offshore wind power integration. In order to study fault ride-through control of M3C, the paper first described the mathematical model and steady-state control strategy of M3C based on double dq axis. From the simulations of a three-phase symmetrical fault on the grid in MATLAB/Simulink, the paper analyzed the transient characteristics of M3C, and then proposed a fault ride-through strategy. The low frequency AC voltage references were regulated to force the wind farm to reduce their output power which were transferred through the M3C, and on the line frequency side, the maximized remaining reactive power capacity of the converter was utilized to support the grid voltage. According to the system demands for active and reactive power, there were three scenarios, active-reactive power trade-off, active power priority and reactive power priority. Simulation results show that the proposed strategy can improve fault ride-through capability of M3C according to different control requirements, ensure the average capacitor voltage of M3C below the threshold value, and realize safe fault ride-through without additional chopper circuit and communication. And it is beneficial to maintain continuous wind power integration and grid fault recovery. © 2023 Science Press. All rights reserved.
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页码：19 / 30
页数：11
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