摘要
基于公共节点电压的逆变器并联功率理论在微电网系统应用中存在局限性,本文以逆变器输出端电压为切入点重新推导了并联功率理论,提出一种基于"类功率"的无互联线并联下垂控制策略。依据"类功率"定义,建立了新型控制策略下的并联系统小信号数学模型。通过数学模型建立系统传递函数,依据自动控制原理分析下垂参数的变化对三相逆变器并联系统稳定性的影响,为并联系统的性能分析和参数设计提供了理论依据。在两台光伏发电三相逆变器组成的小型微电网平台上进行了实验研究,仿真和实验验证了该方法的可行性和有效性。
There is limitation of traditional power theory of parallel operation of inverters based on the voltage of point of common coupling（PCC） in micro-grid system.An improved power theory of parallel system is deduced based on output terminal voltage of an inverter from a viewpoint of micro-grid autonomy operation.The ＂quasi power＂ variables are defined by linear combination and quasi active power and quasi reactive power are only related to the phase and amplitude difference respectively.A quasi-power droop control method for parallel connected inverters is proposed based on the improved power theory.The small-signal mathematical model of the parallel system is derived in a novel droop control scheme,which provides a theoretical basis for the parallel system performance analysis and droop coefficient design.The experiments were studied in the PV platform formed by two parallel connected three-phase inverters and the experimental results verify the correctness and feasibility of the proposed method.
出处
《电工技术学报》
EI
CSCD
北大核心
2012年第1期32-39,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金重点项目(50837003
51077113)
河北省重点实验室开放基金(dldz201002)资助
关键词
下垂控制
类功率
三相逆变器
并联
微电网
Droop control
Quasi-power
three-phase inverter
parallel
micro-grid
