Research On Optimal Control Of Voltage-Source Three-Phase Revesible Converter

The paper is supported by NSF (The National Science Foundation)(Item Number:59577007) and NSF of Hebei province (Item Number:500206).Three-phase voltage source converter is a nonlinear system with multi-input and multi-output. System is widely investigated internationally because it has better capability than current source converter, especially in bi-directional power transfer and sinusoidal current. To solve problem of harmonics and reactive power compensation, researchers have proposed many control strategies in recent years. It accelerated the development of three-phase converter. Most of them are limited on ideally conditions; the study of converters based on non-ideally conditions is so little.Optimal control theory and optimal controller based state-feedback PI and LQI are applied three-phase converter .It not only can guarantee high power factor and stability, but also robust with parameters change of system. At the same time, it can provide constant dc bus voltage and unity power factor under different loads and some non-ideally conditions.At the beginning the controllable techniques of the converter in the world are reviewed. Its operational principle and internal parameter relation are analyzed. The model of system in different coordinates is presented. It's the base of the theoretic analysis. Then a new switch modulation strategy is discussed. It can make system work in minimum switch loss. The simulation of system control and switch strategy validated consistency with theory analysis using MATLAB. The optimal control is implemented with TMS320F240 The paper introduced the design of hardware and control circuits and completed program of DSP and hardware circuit debugging. At last, experiment of open loop and closed loop system are completed, which is in accord with the simulation result. It verified feasibility and advantage of the control scheme.