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双馈风电场的柔性高压直流输电系统控制

, PP. 7-15

Keywords: 风力发电,风电场,双馈电机,高压直流输电,电压源换流器

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Abstract:

风电场采用柔性高压直流输电(voltagesourceconverter-highvoltagedirectcurrent,VSC-HVDC)方式接入系统后,风电场母线电压的控制效果将影响风电场的稳定运行和受端系统的电能质量,而传统的风电场母线电压的幅相控制方式是间接电流控制方式,风电场交流侧电流动态响应缓慢且易受系统参数变化影响,从而导致风电场母线电压控制效果变差。因此有必要寻求更佳的风电场母线电压控制方案来确保整个系统的运行效果。针对双馈风力发电机(doubly-fedinductiongenerator,DFIG)风电场VSC-HVDC的系统接入方式,分析系统各部分的动态模型,对风电场侧电压源换流器(windfarmsidevoltagesourceconverter,WFVSC),依据其稳态方程设计了一种新的风电场母线电压矢量控制结构,该结构引入带有交叉乘积项的电流环,在实现电流环解耦控制的同时,可有效克服风电场接入参数变化所带来的不利影响;对电网侧电压源换流器(gridsidevoltagesourceconverter,GSVSC)通过输入输出线性化设计来控制直流电压。最后通过对风电场输出功率波动、风电场当地负荷波动以及风电场系统接入侧电阻参数变化的情况进行仿真分析,仿真结果验证了该控制方案的正确性和有效性。

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