摘要
针对光伏电源和储能装置主要配置在直流网,交流网在离网时需克服光伏电源出力波动的问题,提出一种微电网离网模式下的光伏逆变器并联控制策略:直流网侧逆变器为主逆变器,采用恒定电压幅值以及P-f下垂法为交流网提供全部无功及部分有功功率;少数较小容量的光伏逆变器为从逆变器,从逆变器不提供无功,采用自适应下垂系数法输出与实时最大功率匹配的有功功率,既维持交流网电压稳定,又充分利用光伏发电。基于MATLAB的系统模型仿真证明了该方法的正确性与可行性。
Photo voltaic （PV） generation and energy storage devices are mainly configured in sub DC network of hybrid AC/DC microgrid and provide power supply for DC load, and using parallel PV inverters a part of PV generations can be connected with sub AC network via point of common coupling （PCC） to supply power for AC loads, thus when sub AC network is being disconnected from conventional power grid the fluctuation of power output of PV generation in sub AC network should be eliminated. A control strategy for parallel PV inverters under the condition of disconnecting sub AC network from conventional grid was proposed： the parallel PV inverter configured in DC network was regarded as master inverter and supply total reactive power and part of active power for sub AC network by constant voltage amplitude and power-frequency droop method; a part of PV inverters with lower capacities were regarded as slave inverters, which did not supply reactive power and supplied only active power controlled by adaptive droop coefficient method, and this part of active power was matched with maximum real-time power of PV generation, thus not only the voltage stability of sub AC network could be maintained, but also the capabilities of PV generations could be fully utilized. Both correctness and feasibility of the proposed control strategy were verified by results of simulation based on Matlab.
出处
《电网技术》
EI
CSCD
北大核心
2012年第8期19-23,共5页
Power System Technology
基金
山东省科技攻关项目(210GGX10706)
山东电力集团公司科技项目支持课题(2010A-61)
关键词
交直流
微电网
光伏逆变器
控制策略
最大功率
DC/AC
micro-grid
photo voltaic （PV） inverter
control strategy
maximum power
