考虑转子电压电流耦合全补偿的双馈感应发电机改进PI-R电流控制策略

发布时间：2019-04-11 16:57

【摘要】：对电网谐波环境下基于PI-R电流控制器的双馈感应发电机(DFIG)控制策略进行了改进。建立了计及电网谐波的DFIG动态模型,分析了电网谐波环境下实现DFIG控制的常用方法。针对常用控制策略中未考虑DFIG转子谐波电压和谐波电流之间耦合的问题,提出了相应的改进方法,即通过对转子谐波电压和谐波电流间的交叉耦合进行补偿,实现了快速动态解耦控制,改善了控制性能。给出了考虑转子谐波电压电流耦合补偿的PI-R电流控制器设计方法。在PSCAD/EMTDC上进行了仿真,验证了改进方案的正确性和有效性。仿真证明,所提出的改进策略在保留PI-R控制器对交、直流量实现无静差控制特性及其良好的频率选择性的同时,更加有效地抑制了电网谐波对DFIG转子电流畸变和功率脉动的影响,进一步提升了电能质量。
[Abstract]:The (DFIG) control strategy of doubly-fed induction generator based on PI-R current controller in harmonic environment is improved. In this paper, the dynamic model of DFIG considering the harmonics of power network is established, and the common methods of realizing DFIG control in harmonic environment of power network are analyzed. Aiming at the problem that the coupling between harmonic voltage and harmonic current of DFIG rotor is not considered in the common control strategy, an improved method is proposed, that is, the cross-coupling between harmonic voltage and harmonic current of rotor is compensated by means of compensating the coupling between harmonic voltage and harmonic current of rotor. The fast dynamic decoupling control is realized and the control performance is improved. The design method of PI-R current controller considering the coupling compensation of rotor harmonic voltage and current is presented. Simulation on PSCAD/EMTDC verifies the correctness and effectiveness of the improved scheme. The simulation results show that the improved strategy not only preserves the AC and DC control characteristics of the PI-R controller, but also has good frequency selectivity. It can restrain the influence of harmonic on the current distortion and power pulsation of DFIG rotor more effectively, and further improve the power quality.
【作者单位】：中国电力科学研究院新能源与储能运行控制国家重点实验室;华北电力大学新能源电力系统国家重点实验室;
【基金】：国家电网公司基础性前瞻性项目(NYB17201400158)~~
【分类号】：TM315

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