For dq control strategies in single-phase pulse width modulation(PWM)converters,the-axis current must be created by imaginary axis current estimation(IACE)methods.The estimated error of the-axis current during the tra...For dq control strategies in single-phase pulse width modulation(PWM)converters,the-axis current must be created by imaginary axis current estimation(IACE)methods.The estimated error of the-axis current during the transient process causes d-q axis current loops to be incompletely decoupled,thereby affecting the dynamic performance of the current loop.The second-order generalized integrator(SOGI)method suffers from slow dynamic response.The fictive-axis emulation(FAE)method provides fast dynamic response but it is sensitive to circuit parameters.A reference-input(RI)-based IACE method is proposed to overcome the above shortcomings.According to the characteristic that the-axis current loop has no transient process,the-axis current is estimated by the d-q axis reference inputs.This is equivalent to introducing the-axis reference input as a feedforward term into the d-q axis current loop,so the parameter sensitivity problem is solved,and the parameter tuning is not needed.The proposed method can maintain good steadystate performance and significantly improve the dynamic performance of the current loop.Furthermore,it is straightforward and can be easily implemented in digital controllers.Comprehensive hardware-in-the-loop(HIL)experimental comparisons with the SOGI and FAE methods have been conducted to verify the correctness and effectiveness of the proposed RI-based IACE method.展开更多
根据三相光伏并网逆变器dq旋转坐标系下数学模型,推导了三相光伏逆变器输出有功功率、无功功率和电网电压、逆变器输出电压、电流之间关系。提出基于空间矢量调制的无差拍功率控制策略,实现三相光伏并网逆器有功功率、无功功率的快速跟...根据三相光伏并网逆变器dq旋转坐标系下数学模型,推导了三相光伏逆变器输出有功功率、无功功率和电网电压、逆变器输出电压、电流之间关系。提出基于空间矢量调制的无差拍功率控制策略,实现三相光伏并网逆器有功功率、无功功率的快速跟踪和解耦控制,输出三相电流波形正弦度好,有功功率和无功功率波动小,且输出频率固定,有利于滤波电感的设计。在一台12 k W样机上进行了实验验证,实验结果表明三相光伏并网逆变器具有良好的静、动态特性,无差拍功率控制策略正确可行。展开更多
以单相两电平脉冲整流器为研究对象,以提高其dq电流解耦控制的动态性能为目的,针对传统dq轴电流计算速度缓慢的问题,提出一种新的dq轴电流计算方法。首先,引入两相坐标系下空间复矢量的概念,建立整流器在dq坐标系下的数学模型,分析dq电...以单相两电平脉冲整流器为研究对象,以提高其dq电流解耦控制的动态性能为目的,针对传统dq轴电流计算速度缓慢的问题,提出一种新的dq轴电流计算方法。首先,引入两相坐标系下空间复矢量的概念,建立整流器在dq坐标系下的数学模型,分析dq电流解耦控制的基本原理;然后,针对单相系统αβ-dq坐标转换需要引入虚拟正交分量问题,提出一种任意相位延时算法,并分析该算法的响应速度与抗噪声干扰能力,该算法与目前几种常用的正交信号产生(orthogonal signal generators,OSG)算法相比具有更快的响应速度,且无需复杂计算、实现简单容易;最后对所提出的算法结合单相整流器dq电流解耦控制进行计算机仿真与半实物实验验证,同时与几种常见OSG算法做对比实验,结果证明了所提算法的正确性与有效性。展开更多
以单相PWM整流器为研究对象,以提高其DQ电流解耦控制的电流内环动态响应速度,增加算法控制精度,实现单位功率因数为目标,首先,建立整流器DQ电流解耦控制的数学模型。其次,针对单相系统坐标变换需要构造虚拟正交分量问题,分析了传统的四...以单相PWM整流器为研究对象,以提高其DQ电流解耦控制的电流内环动态响应速度,增加算法控制精度,实现单位功率因数为目标,首先,建立整流器DQ电流解耦控制的数学模型。其次,针对单相系统坐标变换需要构造虚拟正交分量问题,分析了传统的四分之一周期延时算法与2阶广义积分（second-order generalized integrator,SOGI）算法,研究了一种基于虚拟信号反馈（virtual signal feedback,VSF）的DQ电流解耦控制算法,并给出了电感参数灵敏度分析。然后,为消除电感不匹配对功率因数的不良影响,提出了一种基于稳态q轴电流偏移的电感误差在线补偿算法。最后,对所提出算法进行了仿真和实验验证,同时与传统的延时算法和SOGI算法作对比分析,结果验证了所提算法的正确性以及有效性。展开更多
基金supported by the National Natural Science Foundation of China under Grant 61733015,62473322High-Speed Railway Joint Funds of National Natural Science Foundation of China under Grant U1934204.
文摘For dq control strategies in single-phase pulse width modulation(PWM)converters,the-axis current must be created by imaginary axis current estimation(IACE)methods.The estimated error of the-axis current during the transient process causes d-q axis current loops to be incompletely decoupled,thereby affecting the dynamic performance of the current loop.The second-order generalized integrator(SOGI)method suffers from slow dynamic response.The fictive-axis emulation(FAE)method provides fast dynamic response but it is sensitive to circuit parameters.A reference-input(RI)-based IACE method is proposed to overcome the above shortcomings.According to the characteristic that the-axis current loop has no transient process,the-axis current is estimated by the d-q axis reference inputs.This is equivalent to introducing the-axis reference input as a feedforward term into the d-q axis current loop,so the parameter sensitivity problem is solved,and the parameter tuning is not needed.The proposed method can maintain good steadystate performance and significantly improve the dynamic performance of the current loop.Furthermore,it is straightforward and can be easily implemented in digital controllers.Comprehensive hardware-in-the-loop(HIL)experimental comparisons with the SOGI and FAE methods have been conducted to verify the correctness and effectiveness of the proposed RI-based IACE method.
文摘根据三相光伏并网逆变器dq旋转坐标系下数学模型,推导了三相光伏逆变器输出有功功率、无功功率和电网电压、逆变器输出电压、电流之间关系。提出基于空间矢量调制的无差拍功率控制策略,实现三相光伏并网逆器有功功率、无功功率的快速跟踪和解耦控制,输出三相电流波形正弦度好,有功功率和无功功率波动小,且输出频率固定,有利于滤波电感的设计。在一台12 k W样机上进行了实验验证,实验结果表明三相光伏并网逆变器具有良好的静、动态特性,无差拍功率控制策略正确可行。
文摘以单相两电平脉冲整流器为研究对象,以提高其dq电流解耦控制的动态性能为目的,针对传统dq轴电流计算速度缓慢的问题,提出一种新的dq轴电流计算方法。首先,引入两相坐标系下空间复矢量的概念,建立整流器在dq坐标系下的数学模型,分析dq电流解耦控制的基本原理;然后,针对单相系统αβ-dq坐标转换需要引入虚拟正交分量问题,提出一种任意相位延时算法,并分析该算法的响应速度与抗噪声干扰能力,该算法与目前几种常用的正交信号产生(orthogonal signal generators,OSG)算法相比具有更快的响应速度,且无需复杂计算、实现简单容易;最后对所提出的算法结合单相整流器dq电流解耦控制进行计算机仿真与半实物实验验证,同时与几种常见OSG算法做对比实验,结果证明了所提算法的正确性与有效性。
文摘以单相PWM整流器为研究对象,以提高其DQ电流解耦控制的电流内环动态响应速度,增加算法控制精度,实现单位功率因数为目标,首先,建立整流器DQ电流解耦控制的数学模型。其次,针对单相系统坐标变换需要构造虚拟正交分量问题,分析了传统的四分之一周期延时算法与2阶广义积分（second-order generalized integrator,SOGI）算法,研究了一种基于虚拟信号反馈（virtual signal feedback,VSF）的DQ电流解耦控制算法,并给出了电感参数灵敏度分析。然后,为消除电感不匹配对功率因数的不良影响,提出了一种基于稳态q轴电流偏移的电感误差在线补偿算法。最后,对所提出算法进行了仿真和实验验证,同时与传统的延时算法和SOGI算法作对比分析,结果验证了所提算法的正确性以及有效性。
