逆变电源的广义虚拟电路控制方法

A Generalized Virtual Circuit Control Method for Inverters

输出电压无偏差地跟踪给定电压信号是逆变电源的最高控制目标,由于负载变化的随机性,且逆变电源自身具有较强的非线性和参数时变性,采用常规控制的逆变电源难以获得理想控制效果,为此,提出一种广义虚拟电路控制方法。该方法将逆变电源系统设计为一个虚拟目标等效电路,从满足逆变电源无稳态误差和稳定性以及适用于非线性负载这三方面要求出发,确定虚拟目标等效电路形式。文中通过对比分析,理清了这种方法与传统闭环控制方法的内在联系与本质区别。通过仿真与实验得到验证,广义虚拟电路控制方法可以解决逆变电源的非线性和参数时变性问题,据此设计逆变电源可适用于非线性负载,可达到良好的静态和动态性能指标。

The highest control objective of inverters is to obtain the output voltage tracking given voltage signals with no deviation. Because of the randomness of load change and the nonlinear time-variant characters of inverters, it is hard for traditional controlled inverters to gain an ideal control effect. Thus, a virtual circuit control scheme is raised. In this scheme, the inverter system is designed as a virtual objective equivalent circuit, and the form of the virtual objective equivalent circuit is designed on the basis of 3 demands including stability, compliant to nonlinear loads and eliminating steady state error. In the paper, the basic similarities and essential difference between this new method and traditional close-loop control scheme are obtained through comparative analysis. It is verified through simulations and experiments： the generalized virtual circuit control scheme can be used to solve the nonlinearity of inverters and the time-variant parameter problem. In this way, inverters designed on the basis of this scheme can be applied to nonlinear loads and can get good dynamic index as well as static ones.