摘要
针对并网电压源逆变器(VSI)提出了一种电网电压调制(GVM)直接功率控制(DPC)策略。通过定义GVM的控制输入,可在不使用锁相环的情况下得到一个简单的、耦合状态的多输入多输出系统(MIMO)。在此基础上,依据设定的状态反馈线性化控制法则实现了有功和无功的解耦控制并获得了两个独立的二阶系统,从而不仅能够提高瞬时有功功率和无功功率的收敛速度,还能够获得良好的稳态性能。最后将系统转化为线性MIMO。所提出的方法通过使用MATLAB/Simulink和PLECS模块进行了验证。仿真结果表明,该方法不仅具有良好的有功和无功功率跟踪性能,而且电网三相电流的纹波也比滑模DPC控制方法的大为减小。
A grid voltage modulation( GVM) direct power control( DPC) strategy is proposed for grid-connected voltage source inverter( VSI). By defining the control inputs of the GVM,a simple,coupled state multiple input multiple output(MIMO) system can be obtained without the use of a phase locked loop. On this basis,the active and reactive decoupling control is achieved and two independent second-order systems are obtained according to the set of state feedback linearization control laws,which can not only improve the convergence rate of instantaneous real power and reactive power,but also obtain good steady-state performance. Finally,the system is transformed into linear MIMO. The proposed method is validated by using MATLAB/Simulink and PLECS modules. The simulation results show that this method not only has good active and reactive power tracking performance,but also has lower ripple of three-phase current of power grid than the sliding mode DPC control method.
引文
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