Matrix Converter Control Method And Applied Research

In this paper, the control method for matrix converter (MC) is emphasized. Its mathematic mechanism, fundamental principle, circuit components and application are also described briefly.Based on the investigation with several voltage control methods, such as Venturini method, Instantaneous Double-Voltage Synthesis method and Space Vector Modulation method (SVM), three new control strategies are put forward. Firstly, a time-varying modulation coefficient SVM method is proposed to improve MC's anti-disturbance performance under the asymmetry input voltage. Secondly, a 5-state switching strategy is presented for MC controlled by the SVM method, which reduces the commutation number and switching losses remarkably. Thirdly, a Single-Voltage Synthesis method is put forward, which simplifies the algorithm and reduces the switching losses to the lowest level.Referred to the achievement of current controlled voltage source converter, the idea of current control is introduced into MC. Several current control strategies are proposed. Firstly, a hysteretic band control method is applied to MC's output current control. In order to decrease the harmonics in MC's input and output current, the SVM method and sinusoidal hysteretic band method are introduced into the MC hysteretic control respectively. Secondly, based on the predictive current control fundamental principle, the particular 27 vectors predictive current control strategy and current trend predictive control strategy are proposed. The simulation indicates that all of the current methods can improve the MC's output current quality and speed its dynastic response.At last, the Unified Power How Controller (UPFC) performed by MC is studied. Then a state-feedback de-coupling control strategy is fulfilled by MC's Venturini method for UPFC's power flow control. All of the conclusions are verified by the MATLAB simulation program.