基于下垂控制结构的微电网机组控制设计  

Generator control design based on droop control architecture for microgrid

作　　者：范元亮[1] 苗轶群[1] 江全元[1] 曹一家[2] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027 [2]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电力自动化设备》2012年第6期125-130,共6页Electric Power Automation Equipment

基　　金：国家高技术研究发展计划(863计划)(2009AA05Z221);教育部新世纪优秀人才资助项目(NCET-08-0489);浙江省杰出青年基金资助项目(R1080089)~~

摘　　要：针对取较大下垂系数难以保证功率分配外环稳定性问题,在有功下垂控制环节增设前馈来改善系统稳定性,并建立微电网小扰动模型,验证了前馈能明显改善系统小扰动稳定,从而功率分配外环可取较大下垂系数,降低了微电网机组对配电网频率和电压幅值波动的敏感程度。电流和电压控制环节分别采用了比例谐振校正,在较小控制带宽下采用比例谐振校正也能取得较为满意的控制精度。介绍了并网同期方法,采用下垂控制结构的微电网机组共用一个同期环节,同步跟踪配电网电压相角。仿真结果验证了理论分析的正确性。Since the bigger droop coefficients could not ensure the stability of the power allocation loop,a feed forward path is added to the active power droop control block to improve system stability. The small signal model of microgrid is established to confirm that the feed forward path can significantly improve the stability of system under small disturbance,which makes it possible to adopt bigger droop coefficients of the power allocation loop to lower the sensitivity of generator to the frequency and voltage fluctuation of distribution network. The current and voltage control loops adopt the proportional and resonance compensation to achieve satisfactory control precision even under relatively narrow control band. The synchronization of microgrid is introduced. The generators of microgrid applying the droop control architecture share one synchronization block to simultaneously follow the voltage phase of distribution network. Simulative results show the correctness of the theoretical analysis.

关 键 词：微电网 下垂控制 功率计算 比例谐振校正 功率控制 电压控制 电流控制 

分 类 号：TM711[电气工程—电力系统及自动化]