一种用于三相电压型PWM整流器的新型三矢量模型预测直接功率控制  

A Novel Three-vector-based Model Predictive Direct Power Control for Three-phase PWM Rectifier

作　　者：李晖 台流臣 LI Hui;TAI Liuchen(Electric Power Research Institute of Guangdong Power Grid Co.Ltd.,Guangzhou,Guangdong 510080,China;School of Information and Control Engineering,Weifang University,Weifang,Shandong 261061,China)

机构地区：[1]广东电网有限责任公司电力科学研究院,广东广州510080 [2]潍坊学院信息与控制工程学院,山东潍坊261061

出　　处：《广东电力》2020年第7期64-71,共8页Guangdong Electric Power

基　　金：山东省自然科学基金项目(ZR2018BEE032);山东省高等学校科技计划项目(J18KB142);潍坊市科技发展计划项目(2018GX012)。

摘　　要：三矢量模型预测直接功率控制(model predictive direct power control,MPDPC)已应用于三相电压型脉冲宽度调制(pulse width modulation,PWM)整流器中,在理想电网条件下取得了良好的控制效果;但是在电网不平衡条件下,常规三矢量MPDPC存在网侧电流谐波含量高、瞬时功率脉动大等问题。为此,提出一种新型三矢量MPDPC策略,采用新型瞬时功率理论,重新定义瞬时无功功率,以新型瞬时有功和无功功率误差构成目标函数,通过求解目标函数最优的方式来选择矢量和计算矢量占空比。在电网不平衡条件下,以三相电压型PWM整流器为研究对象,对传统MPDPC策略和新型MPDPC策略进行了仿真与实验测试。结果表明:与传统MPDPC策略相比,采用新型MPDPC策略时网侧电流谐波含量低,并消除了新型瞬时有功和无功功率中的2倍频振荡分量。Three-vector-based model predictive direct power control(MPDPC)has been used in the three-phase voltage pulse width modulation(PWM)rectifier and acquired satisfactory control effect under the condition of ideal power grid.But in case of grid voltage unbalance,there are problems of high current harmonic and large instantaneous power impulse in the conventional MPDPC.This paper therefore proposes a new three-vector-based MPDPC strategy which is to adopt the new instantaneous power theory and redefine instantaneous reactive power.By solving the optimal objective function composed of the new instantaneous active and reactive power errors,voltage vector is selected and duty cycle is calculated.In case of power grid voltage unbalance,the paper takes the three-phase voltage PWM rectifier as the research object,makes simulations of the conventional and the new MPDPC strategies.The results indicate the grid-side current harmonic is lower by using the new MPDPC strategy and it is able to eliminate double frequency oscillation in both new active and reactive power.

关 键 词：三相电压型PWM整流器 三矢量 模型预测直接功率控制 新型瞬时功率理论 电网不平衡 

分 类 号：TM461[电气工程—电器]