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 发电技术  2019, Vol. 40 Issue (2): 128-133    DOI: 10.12096/j.2096-4528.pgt.18254
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Model Prediction Based Direct Power Control Strategy for Three-level PWM Converter
Huimin LI(),Hui LI(),Xinqiao FAN
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Abstract

To meet the requirements of fast power response speed for pulse width modulation (PWM) type converter and constant switching frequency for insulated gate bipolar transistor (IGBT), a direct power control strategy based on model prediction was proposed for three-level PWM converter. The double closed-loop control was adopted in this strategy, namely voltage outer-loop and power inner-loop. The phase-locked loop in the outer-loop is omitted, which simplifies the structure of the control system. A PI regulator is not need in the inner-loop, which makes parameters' design simple and the response speed fast. A model of three-level neutral point clamp type PWM converter was built in MATLAB/SIMULINK. The effects between the presented control strategy and traditional PI control were analyzed. The simulation results show that the new control strategy effectively reduces the total harmonic distortion rate of the AC-side current, improves the AC-side power factor, and has good dynamic and steady-state characteristics.

Key wordspulse width modulation (PWM) converter    neutral point clamped type    model prediction    direct power control    double closed-loop PI control

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##### 引用本文:

Huimin LI,Hui LI,Xinqiao FAN. Model Prediction Based Direct Power Control Strategy for Three-level PWM Converter. Power Generation Technology, 2019, 40(2): 128-133.

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 图1  三电平NPC型PWM变流器主电路拓扑图 图2  有功、无功电流分量ip和iq矢量图 图3  三相PWM变流器的MP-DPC原理图 图4  有功功率参考值线性拟合示意图 表1  系统仿真参数表 图5  2种控制策略下的直流侧电压波形 图6  2种控制策略下的A相电压电流波形 图7  2种控制策略下的网侧电流谐波分析 图8  2种控制策略下的网侧瞬时有功、无功功率波形 图9  2种控制策略下的直流侧电压波形 图10  电感取值不同时的直流电压波形
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