AN ENHANCED CONTROL STRATEGY OF THREE-PHASE FOUR-WIRE INVERTERS UNDER NONLINEAR LOAD CONDITIONS

  • Van Tan Luong
  • Pham Dinh Tiep
  • Le Nguyen Hoa Binh
Từ khóa: Nonlinear load, three-phase inverter, feedback linearization, sliding mode control, unbalanced load

Tóm tắt

An enhanced nonlinear control technique based on a coordination between feedback linearization (FBL) approach and sliding mode control (SMC) is proposed for a three-phase split-capacitor inverter under the nonlinear load conditions. A nonlinear model of system with pulse-width modulation (PWM) voltage-source inverter (VSI) including the output inductorcapacitor (LC) filters is derived in the d q-0 synchronous reference frame, not by small signal analysis. The controllers for d-q-0 components of three-phase line-to-neutral load voltages are designed by linear control theory. With the proposed coordination scheme, three-phase split-capacitor inverter provides an excellent control performance for regulating the load voltages with nearly zero steady-state errors in both the transient and steady states. The proposed scheme is verified by the simulation results which show that three-phase split-capacitor inverter gives a low total harmonic distortion (THD) for the load voltages under the balanced or unbalanced nonlinear load conditions.

điểm /   đánh giá
Phát hành ngày
2021-04-29
In ra
Tập. 21 Số. 1 (2021)
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