摘要
为提高直流环节的动态响应,抑制功率突变时的母线电压波动,本文在建立双PWM变频调速系统能量平衡数学模型的基础上,将无功电流引入功率调节环,采用输出功率直接反馈,首次提出动态和稳态分步补偿的全响应直接功率控制策略,即以功率为控制量,对稳态所需能量进行实时性补偿,对动态所需能量以n个期望控制周期为单位进行阶段性补偿。实验结果表明,改进后的电压型PWM整流器控制策略显著提高了直流环节的动态响应,且有效抑制直流母线电压波动,实现了对双PWM变频系统能量流动的精确控制和协调性能的提升。
In order to improve the dynamic response of the DC link as well as inhibiting voltage fluctuation on DC link voltage at abrupt change of power, a new type of full response power compensation control strategy based on energy-balance mathematical model of double pulse width modulation(dual-PWM) converter speed regulation system is first presented. The new method introduces reactive current into power regulation loop, and uses the output direct feedback. Full response power compensation can be divided into steady-state energy needed for real-time compensation and dynamic response process of the energy required in n expected control cycle phased compensation based on direct power control(DPC). Experimental results show that this new control strategy of three phase boost type PWM rectifiers has improved the dynamic response of DC link, also effectively inhibited the voltage fluctuation on DC link voltage, and therefore achieved at a coordinate improvement on both the accuracy and performance of energy flow control.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第4期113-120,共8页
Transactions of China Electrotechnical Society
基金
2012国家科技支撑计划资助项目(2012BAF09B02)
关键词
双PWM变频器
能量平衡
输出功率反馈
直接功率控制
全响应
Dual-PWM converter,energy balance,output power feedback,direct power control(DPC),complete response
