基于旋转坐标变换交流电子负载模拟实验研究

针对传统交流电子负载基于内环电流PI控制动态响应较差,且易受网侧波动干扰,以双PWM变换器为电路基础,参考三相PWM整流器通过旋转坐标变换分别控制有功与无功电流来消除稳态误差的模型,提出单相PWM整流器(VSR)旋转坐标变换模型.通过构建正交虚拟电流与前馈解耦并结合基于BP神经网络的自调整PI控制,在稳定直流母线电压的同时实现负载模拟电流的矢量控制,提高负载模拟的动态和稳态特性.实验结果表明,在纯阻、感阻、容阻负载模拟下,该控制策略能够有效提高负载模拟动态响应,对比常规PI,可知基于BP神经网络自整定的PI控制在参考电流为1 A阶跃响应中超调量减少约10％,调节时间减少约9 ms.

Experimental study on alternating current electronic load based on rotating coordinate transformation

In view of the traditional AC Electronic Load based on the innerring current PI control is poorer, dynamic response and vulnerable network side wave interference, based on the circuit of dual PWM converter, reference three-phase PWM rectifier controlled by rotating coordinate transformation are active and reactive current to eliminate the steady-state error of the model, put forward single-phase PWM rectifier (VSR) rotating coordinate transformation models, by constructing virtual current and feedforward decoupling and combined with orthogonal self-adjusting PI control based on BP neural network, at the same time in the stability of DC bus voltage load simulation of the current vector control, improve the load simulation of dynamic and steady-state characteristics. The experimental results show that under pure resistance, inductive resistance and capacitive resistance load simulation, the control method can effectively improve the load simulation response. Compared with the conventional PI, the self-tuning PI control based on BP neural network, the overshot can be reduced by about 10% and the adjustment time can be reduced by about 9ms when the reference current is 1A step response.#$NLKeywords: Single-phase PWM rectifier; Rotation coordinate transformation; Feed forward decoupling; BP neural network