In the conventional cascade control structure of aerospace electrically powered actuators, the current（or electromagnetic torque） loop plays a critical role in realizing a rapid response for a digitally controlled B...In the conventional cascade control structure of aerospace electrically powered actuators, the current（or electromagnetic torque） loop plays a critical role in realizing a rapid response for a digitally controlled Brush Less Direct Current（BLDC） motor. Hysteresis Current Control（HCC） is an effective method in improving the performance of current control for a BLDC motor.Nevertheless, the varying modulating frequency in the traditional HCC causes severe problems on the safety of power devices and the electromagnetic compatibility design. A triangular carrier-based fixed-frequency HCC strategy is expanded by relaxing the constraints on the rising and descending rates of the winding current to advance the capability of HCC to realize fixed-frequency modulation in the steady state. Based on that, a new flexible-bound-size quasi-fixed-frequency HCC is proposed, and the range feasible to realize fixed-frequency modulation control can cover the entire running process in the steady state. Meanwhile, a corresponding digital control strategy is designed,and four digitalization rules are proposed to extend the capacity to achieve fixed-frequency modulation control to the unsteady working state, that is, a novel fixed-frequency modulation is realized.Simulation and experimental results prove the effectiveness of this improved fixed-frequency HCC strategy.展开更多
为解决因级联型多电平有源滤波器电路结构导致其价格比较昂贵而限制了其应用的问题,采用模块化的思想设计一种新型主电路结构。利用对输出电平进行数学排列组合,将开关进行重新布置,以实现减少开关和直流电源数量的目的。依据新型结构...为解决因级联型多电平有源滤波器电路结构导致其价格比较昂贵而限制了其应用的问题,采用模块化的思想设计一种新型主电路结构。利用对输出电平进行数学排列组合,将开关进行重新布置,以实现减少开关和直流电源数量的目的。依据新型结构进行模型分析,采用三角载波的控制策略;通过DSP芯片构成100 k V·A样机进行试验,与传统的H桥级联型电路比较试验波形结果,谐波畸变率、控制波形、直流电压稳定性等多个参数分析,验证了所提新型主电路较传统电路在补偿效果和控制复杂程度等方面的优越性。展开更多
针对机载电动静液作动器(EHA)用20 k W级大功率无刷直流电机,提出了一种改进的定频数字滞环电流控制策略(HCCS)。在此控制策略中,通过对PWM_ON调制模式下相电流数学模型的构建以及相应电流环控制模式的分析,对一种综合三角载波控制和滞...针对机载电动静液作动器(EHA)用20 k W级大功率无刷直流电机,提出了一种改进的定频数字滞环电流控制策略(HCCS)。在此控制策略中,通过对PWM_ON调制模式下相电流数学模型的构建以及相应电流环控制模式的分析,对一种综合三角载波控制和滞环电流控制的混合滞环电流控制进行改进,设计了一种实现简单、控制稳定、具有过流保护功能以及功率元件开关频率有条件固定的改进的准定频滞环电流控制策略,并通过数字化处理,引入数字化规则,实现完全的定频控制。仿真和实验结果表明,此控制策略能够实现大功率无刷直流电机控制时固定的功率元件开关频率以及高频率响应,将为高性能大功率无刷直流电机高效的电流控制提供一条新路径。展开更多
基金supported by the National Natural Science Foundation of China (Nos.51275021,61327807)
文摘In the conventional cascade control structure of aerospace electrically powered actuators, the current（or electromagnetic torque） loop plays a critical role in realizing a rapid response for a digitally controlled Brush Less Direct Current（BLDC） motor. Hysteresis Current Control（HCC） is an effective method in improving the performance of current control for a BLDC motor.Nevertheless, the varying modulating frequency in the traditional HCC causes severe problems on the safety of power devices and the electromagnetic compatibility design. A triangular carrier-based fixed-frequency HCC strategy is expanded by relaxing the constraints on the rising and descending rates of the winding current to advance the capability of HCC to realize fixed-frequency modulation in the steady state. Based on that, a new flexible-bound-size quasi-fixed-frequency HCC is proposed, and the range feasible to realize fixed-frequency modulation control can cover the entire running process in the steady state. Meanwhile, a corresponding digital control strategy is designed,and four digitalization rules are proposed to extend the capacity to achieve fixed-frequency modulation control to the unsteady working state, that is, a novel fixed-frequency modulation is realized.Simulation and experimental results prove the effectiveness of this improved fixed-frequency HCC strategy.
文摘为解决因级联型多电平有源滤波器电路结构导致其价格比较昂贵而限制了其应用的问题,采用模块化的思想设计一种新型主电路结构。利用对输出电平进行数学排列组合,将开关进行重新布置,以实现减少开关和直流电源数量的目的。依据新型结构进行模型分析,采用三角载波的控制策略;通过DSP芯片构成100 k V·A样机进行试验,与传统的H桥级联型电路比较试验波形结果,谐波畸变率、控制波形、直流电压稳定性等多个参数分析,验证了所提新型主电路较传统电路在补偿效果和控制复杂程度等方面的优越性。
文摘针对机载电动静液作动器(EHA)用20 k W级大功率无刷直流电机,提出了一种改进的定频数字滞环电流控制策略(HCCS)。在此控制策略中,通过对PWM_ON调制模式下相电流数学模型的构建以及相应电流环控制模式的分析,对一种综合三角载波控制和滞环电流控制的混合滞环电流控制进行改进,设计了一种实现简单、控制稳定、具有过流保护功能以及功率元件开关频率有条件固定的改进的准定频滞环电流控制策略,并通过数字化处理,引入数字化规则,实现完全的定频控制。仿真和实验结果表明,此控制策略能够实现大功率无刷直流电机控制时固定的功率元件开关频率以及高频率响应,将为高性能大功率无刷直流电机高效的电流控制提供一条新路径。
