双馈风电场的柔性高压直流输电系统控制  被引量:41

VSC-HVDC System Control for Grid-connection of DIFG Wind Farms

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作  者:廖勇[1] 王国栋[1] 

机构地区:[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044

出  处:《中国电机工程学报》2012年第28期7-15,24,共9页Proceedings of the CSEE

基  金:重庆市科委科技计划项目攻关项目(CSTC2008AB3047)~~

摘  要:风电场采用柔性高压直流输电(voltage sourceconverter-high voltage direct current,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-fed induction generator,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(wind farm side voltage source converter,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(gridside voltage source converter,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。The voltage control of wind farm is very important when the wind farm is connected to the power system using voltage source converter-high voltage direct current (VSC-HVDC) transmission. The performance of the wind farm voltage control will affect the wind farm operating status and power quality of the receiving end, as the traditional voltage amplitude-phase control scheme of wind farm is an indirect current control style, the dynamic response of the AC side current is slow and vulnerable to the systems parameters, this will deteriorate the voltage control of wind farm. Thus, it is necessary to find a robust control scheme to ensure that the entire system is operating effectively. In this paper, a VSC-HVDC system for the grid-connection of doubly-fed induction generator (DFIG) wind farms was used and by the dynamic model of the whole system was analyzed. A new wind farm voltage vector control struc^re for the wind farm side voltage source converter (WFVSC) was designed based on the steady-state equation. With the introduction of cross-product terms of a inner current loop, the control was decoupled and it could effectively overcome the adverse effects caused by wind farm parameter changes; On the grid side voltage source converter (GSVSC), the input-output linearization was designed to control the DC voltage. Finally, the power fluctuations of wind farms, the local load fluctuations of the wind farms, and the resistance parameters changing at the the wind farm side were simulated and the results show that the proposed control models are correct and valid.

关 键 词:风力发电 风电场 双馈电机 高压直流输电  压源换流器 

分 类 号:TM72[电气工程—电力系统及自动化]

 

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