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作 者:易桂平[1]
机构地区:[1]常熟理工学院电气与自动化工程学院,常熟215500
出 处:《电工技术学报》2015年第14期377-387,共11页Transactions of China Electrotechnical Society
摘 要:在基于平衡假设的前馈解耦恒功率控制是微网典型的控制策略,通过对该策略进行功率分析,并釆用开关函数法进行并网逆变器输出特性分析,针对电网电压不平衡条件下负序和3次谐波现象,在原有PQ控制控制结构基础上叠加一个前馈电压负序控制环,使微网并网逆变器产生一个与公共连接点不平衡电压中负序分量大小相等相位相同的电压,实现微网并网节点的三相对称控制,改进的开关函数调制法的采用抑制了3次谐波的输出。仿真和实验结果表明,改进的微网不平衡PQ控制策略提高了微网在电网电压不对称条件下的生存能力。A typical micro-grid control strategy is generally feed-forward decoupling constant power(PQ) control based on equilibrium assumption. Through the power analysis on the micro-grid control strategy and analysis of grid-connected inverter output performance using switching function, it could come to the conclusion that the output of the inverter consists of third harmonic and negative sequence components based on the control strategy of equilibrium assumption under the condition of voltage unbalance on the grid. In order to improve the performance, a feed-forward negative sequence voltage control loop is used to superimpose on the original PQ control structure, achieving the purpose of offsetting voltage negative sequence component in the grid and maintaining three-phase balance. Also, the system could suppress the output of the third harmonic through the improved switching function modulation method. The simulation and experiment results indicate that the improved micro-grid unbalanced PQ control strategy may improve the survival capacity of micro-grid under asymmetrical grid voltage.
关 键 词:平衡假设 前馈解耦PQ控制 开关函数法 负序控制环 不平衡
分 类 号:TM615[电气工程—电力系统及自动化]
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