基于VSC-MTDC系統(tǒng)的改進(jìn)多點(diǎn)直流電壓控制策略
張濤,宋恒東,潘靈敏,昌國際,吳偉
(國網(wǎng)江蘇省電力有限公司檢修分公司,江蘇 南京 211102)
摘 要:針對多端直流輸電系統(tǒng)定電壓控制方式的不足,提出了考慮系統(tǒng)啟動之初和大幅功率變動時的改進(jìn)多點(diǎn)直流電壓控制策略,并搭建了含等效海上風(fēng)電場的多端直流輸電系統(tǒng),利用MATLAB/Simulink在多種擾動和故障運(yùn)行工況下進(jìn)行了仿真分析。仿真結(jié)果表明,該控制策略具有較好的響應(yīng)速度、精度和穩(wěn)定性,能夠?qū)崿F(xiàn)系統(tǒng)換流站間的穩(wěn)定運(yùn)行。
關(guān)鍵詞:風(fēng)電場;多點(diǎn)直流電壓控制;多端直流輸電
中圖分類號:TM714.2 文獻(xiàn)標(biāo)識碼:A 文章編號:1007-3175(2018)12-0012-05
Improved Multi-Point Direct Current Voltage Control Strategy Based on Voltage Source
Converter-Multi-Terminal Direct Current
ZHANG Tao, SONG Heng-dong, PAN Ling-min, CHANG Guo-ji, WU Wei
(State Grid Jiangsu Electric Power Co., Ltd Maintenance Branch Company, Nanjing 2111 02, China)
Abstract: Aiming at the constant voltage control method for multi-terminal direct current (DC) transmission systems, this paper proposed to improve the multipoint DC voltage control strategy considering the time of first system booting and sharp power fluctuation and established the multipoint DC transmission system equivalent to the offshore wind plant. Simulink in MATLAB was used to carry out simulation and analysis under a variety of disturbance and malfunction operation condition. Simulation results show that the control strategy has good response speed, precision and stability, and can achieve stable operation of the converter stations.
Key words: wind farm; multi-point direct current voltage control; multi-terminal direct current transmission
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