A vector control based on the extended equivalent circuit and virtual circuits is proposed for the single-phase inverter.By the extended circuit,the other two phase voltages can be extended by the output voltage of th...A vector control based on the extended equivalent circuit and virtual circuits is proposed for the single-phase inverter.By the extended circuit,the other two phase voltages can be extended by the output voltage of the single-phase inverter so as to construct the voltage vector.The voltage outer-loop is to control the voltage vector in dq coordinate system,and the output voltage can track the target value without deviation in steady state.By designing the virtual circuit,the voltage inner-loop can achieve approximate decoupling and improve the dynamic response under the changeable load.Compared with the traditional dual closed-loop control,the proposed dual closed-loop control scheme only needs to detect and control the voltage without the current.It not only can achieve good control effect,but also reduce the complexity of the hardware.Finally,the simulation and experimental results show that the single-phase inverter has good static and dynamic characteristics regardless of stable load or changeable load.展开更多
控制策略对保证基于模块化多电平换流器的高压直流输电系统(modular multilevel converter-high voltage direct current transmission,MMC-HVDC)正常工作起着至关重要的作用。经典双闭环矢量控制具有控制精度高、响应速度快等特点,但...控制策略对保证基于模块化多电平换流器的高压直流输电系统(modular multilevel converter-high voltage direct current transmission,MMC-HVDC)正常工作起着至关重要的作用。经典双闭环矢量控制具有控制精度高、响应速度快等特点,但需要控制器设计和控制参数调节;模型预测控制具有建模直观、无需控制器优点,但预测指令的求解过程稍显复杂。该文在两相静止坐标系下,综合2种控制策略的优点,基于功能等效思想,将双闭环矢量控制等效划分为2个模型预测环节,构成改进模型预测控制。研究2种不同的控制指令获取方法,避免传统预测控制运算量大、权重因子调节复杂等问题。通过对模块化多电平换流器技术(modular multi-level converter,MMC)数学模型离散化,建立MMC阀侧电压控制指令输出预测模型,实现内环控制器等同功能。分别针对电网电压平衡和不平衡工况,从功率跟踪、负序电流抑制及功率波动抑制等方面验证所设计控制策略的有效性。展开更多
基金This work was supported in part by the National Natural Science Foundation of China under Grant 61773006.
文摘A vector control based on the extended equivalent circuit and virtual circuits is proposed for the single-phase inverter.By the extended circuit,the other two phase voltages can be extended by the output voltage of the single-phase inverter so as to construct the voltage vector.The voltage outer-loop is to control the voltage vector in dq coordinate system,and the output voltage can track the target value without deviation in steady state.By designing the virtual circuit,the voltage inner-loop can achieve approximate decoupling and improve the dynamic response under the changeable load.Compared with the traditional dual closed-loop control,the proposed dual closed-loop control scheme only needs to detect and control the voltage without the current.It not only can achieve good control effect,but also reduce the complexity of the hardware.Finally,the simulation and experimental results show that the single-phase inverter has good static and dynamic characteristics regardless of stable load or changeable load.
文摘控制策略对保证基于模块化多电平换流器的高压直流输电系统(modular multilevel converter-high voltage direct current transmission,MMC-HVDC)正常工作起着至关重要的作用。经典双闭环矢量控制具有控制精度高、响应速度快等特点,但需要控制器设计和控制参数调节;模型预测控制具有建模直观、无需控制器优点,但预测指令的求解过程稍显复杂。该文在两相静止坐标系下,综合2种控制策略的优点,基于功能等效思想,将双闭环矢量控制等效划分为2个模型预测环节,构成改进模型预测控制。研究2种不同的控制指令获取方法,避免传统预测控制运算量大、权重因子调节复杂等问题。通过对模块化多电平换流器技术(modular multi-level converter,MMC)数学模型离散化,建立MMC阀侧电压控制指令输出预测模型,实现内环控制器等同功能。分别针对电网电压平衡和不平衡工况,从功率跟踪、负序电流抑制及功率波动抑制等方面验证所设计控制策略的有效性。
