基于ESO-Backstepping的直流微电网母线电压稳定控制

针对微电网中存在的非线性和参数变化等问题,为提高微电网直流母线电压控制的稳定性,提出了一种ESO与Backstepping相结合的控制方案。采用ESO观测系统的非线性及参数变化,采用Backstepping方法设计控制器,在补偿系统非线性和参数变化的同时保证系统的稳定性。并将所提的ESO-Backstepping控制方法与经典PID、Backstepping控制方法进行对比。仿真结果表明ESO-Backstepping控制方法在微电网非线性系统参数发生变化的情况下,仍可实现对直流母线电压的稳定控制,方法简单有效、稳定性好、鲁棒性强。

Research on bus voltage stability control of DC microgrid based on ESO-Backstepping

In order to improve the stability control of DC bus voltage in microgrid, a control scheme combining ESO and backstepping is proposed to solve the problems of nonlinearity and parameter variation in microgrid. ESO is adopted to observe the non-linearity and parameter variation of system. Backstepping method is used to design the controller, which can compensate the non-linearity and parameter variation of the system while ensuring the stability of the system. The ESO-Backstepping based control method proposed in this paper is compared with the classical PID and backstepping control methods. Simulation results show that the ESO-Backstepping based control method can realize the stability control of DC bus voltage even when the parameters of the nonlinear system change. The method is simple and effective, and has good stability and strong robustness. This work is supported by Natural Science Foundation of Hebei Province (No. F2016203006).