多功能并网逆变器及其在微电网电能质量定制中的应用

针对微电网电能质量的定制进行了研究,并研究了一种多功能并网逆变器拓扑及其控制策略以实现微电网电能质量的定制。给出了微电网电能质量定制的概念,阐释了其目的和意义;建立了多功能并网逆变器的数学模型并给出了其控制策略;提出了一种适合于微电网电能质量定制的多功能并网逆变器参考电流生成算法;给出了一种微电网电能质量综合评估的层次分析模型,提出了以补偿容量最少为目标的最优补偿方法,并利用拉格朗日乘子法进行了求解;最后利用PSCAD/EMTDC验证了多功能并网逆变器在微电网电能质量定制方面的可行性和有效性,并从技术性和经济性的角度探讨了多功能并网逆变器在微电网电能质量定制中的效益。

A Multi-Functional Grid-Connected Inverter and Its Application to Customized Power Quality of Microgrid

On the basis of analyzing the customized power quality of microgrid,the topology of a multi-functional grid-connected inverter(MFGCI) and its control strategy are researched to implement the customization of power quality of microgrid.Firstly,a concept on customized power quality of microgrid is given and the purpose and the meaning of proposing this concept is expounded,and a mathematical model for MFGCI is built and its control strategy is given;secondly,an algorithm to generate the reference current of MFGCI that is suitable to the customization of power quality of microgrid is put forward;thirdly,a hierarchical analysis model for synthetical evaluation of power quality of microgrid is given,and the optimal compensation method in which the minimum compensation capacity is taken as the objective is proposed and solved by Lagrangian multiplier method;finally,both feasibility and effectiveness of MFGCI in the customization of power quality of microgrid are verified by PSCAD/EMTDC,and from the viewpoints of technique and economy the benefit from adopting MFGCI in the customization of power quality of microgrid is discussed.