基于相对增益矩阵的微网稳压解耦下垂控制方法  

Voltage Stabilization and Decoupling Droop Control Method for Microgrid Based on RGA

作　　者：李鹏[1] 杨世旺[2] 殷梓恒[1] 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),河北省保定市071003 [2]国网浙江省电力公司丽水供电公司,浙江省丽水市323000

出　　处：《中国电机工程学报》2015年第5期1041-1050,共10页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2015AA050104);国家自然科学基金项目(50977029);河北省自然科学基金项目(E2013502074)~~

摘　　要：微网灵活多样的运行方式离不开性能良好的控制方法,而微网线路阻抗参数的特殊性给微网控制系统带来了功率耦合问题,影响了微网功率的精确解耦控制。文中引进解耦理论的相对增益矩阵(relative gain array,RGA),提出基于RGA的微网稳压解耦下垂控制方法,量化微网功率模型的耦合情况,进行微网功率模型中被控制量与操作变量的配对重组,并对重组前后的控制系统耦合过程进行分析;在微电源功率接口控制系统中引入虚拟电阻环,从消除耦合通道的角度对微网功率模型进行解耦;深入分析虚拟电阻和控制系统参数对控制系统稳定性以及功率接口输出阻抗的影响。通过电压差反馈环实现了稳压控制,消除了虚拟电阻带来的电压降。仿真分析验证了所提出方法的正确性和可行性。Flexible operation of a microgrid depends on advanced control methods. The characteristics of lines parameters in microgrid cause the power coupling problem in microgrid control system, affecting the accurate independent control of microgrid. Decoupling theory was applied to solve the problem. The coupling condition of microgrid power transmission model was quantified by the relative gain array method to match and restructure the input and output variables of microgrid power transmission model, and the control system coupling process of two different matching schemes were analyzed. To eliminate the coupling channel, virtual resistance unit was introduced into the micro source power interface control system, and the influence of virtual resistance and control parameters on the stability of control system and power interface output impedance was analyzed. The voltage difference feedback loop was applied to realize the voltage stabilization control, and the voltage drop caused by the virtual resistance was eliminated. The simulation results verified the correctness and validity of the proposed method.

关 键 词：微网 功率解耦 相对增益矩阵 下垂控制 

分 类 号：TM71[电气工程—电力系统及自动化]