针对单相三电平脉冲整流器存在中点电位不平衡问题,提出一种评价函数,在模型预测算法的基础上增加了一个评价因子,在无需额外的中点电位平衡模块条件下实现了单相三电平脉冲整流器中点电位平衡。为降低硬件设计成本,提高电路可靠性,采用无网压传感器算法,但传统的无网压传感器会因引入一阶低通滤波器而产生相位偏移和幅值衰减的问题;为解决相位和幅值问题,提出一种改进的无网压传感器算法,利用α-β的垂直关系进行幅值和相位补偿,得到无相位偏移和幅值衰减的网侧交流电压。通过实验验证了所提控制方法的正确性和有效性。
Abstract
An evaluation function is proposed to solve the problem of midpoint potential imbalance in single-phase three-level pulse rectifier. Based on the model prediction algorithm, an evaluation factor is added to realize the midpoint potential balance of single-phase three-level pulsed rectifier without additional midpoint potential balance module. In order to reduce the cost of hardware design and improve the reliability of the circuit, the gridless pressure sensor algorithm is used. the traditional gridless pressure sensor has the problem of phase shift and amplitude attenuation due to the introduction of first-order low-pass filter. To solve the problem of phase shift and amplitude attenuation, an improved gridless pressure sensor algorithm is proposed, which uses the vertical relationship of α-β to compensate the amplitude and phase. The network-side AC voltage without phase shift and amplitude attenuation is obtained. The experimental results demonstrate the correctness and effectiveness of the proposed algorithm．
关键词
电力整流器 /
脉宽调制 /
谐波分析 /
预测控制系统 /
分布式发电
Key words
electric rectifiers /
pulse width modulation /
harmonic analysis /
predictive control systems /
distributed power generation
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基金
陕西省教育厅一般专项科学研究计划项目（23JK0622）; 陕西省教育厅高等教育教学改革研究项目（21GY021）
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