棒位探测器电源系统比例复数积分控制策略研究

Research on Proportional Complex Integral Control Strategy for Rod Position Detector Power Supply System

单相逆变器在核电厂棒位检测系统中工作于电压源模式,其负载棒位探测器通常等效为阻感性负载,而阻感性负载连接至逆变器输出端不能稳定地输出正弦电压。为此,本文针对单相逆变器棒位探测器电源系统提出了一种比例复数积分(PCI)控制策略,并给出控制器参数设计方法。首先,基于系统的频域模型推导出电流环比例积分(PI)控制器和电压环PCI控制器参数解析式,并考虑负载参数对系统稳定性的影响。然后,设定期望的电流环和电压环开环截止频率和相位裕度,通过本文方法解析计算PI和PCI控制器参数。最后,通过MATLAB仿真验证了本文方法能够使阻感性负载下的单相逆变器得到稳定的输出电压与输出电流,且输出电流谐波畸变率(THD)<0.3%。该方法可以为单相逆变器棒位探测器电源系统控制提供指导。

Single-phase inverter works in voltage source mode in rod position detection system of nuclear power plant.The load rod position detector is usually equivalent to a inductive load,but inductive load connected to the output of the inverter cannot output a stable sinusoidal voltage.In this paper,a proportional complex integral(PCI)control strategy is proposed for the power supply system of single-phase inverter rod position detector,and the parameter design method of the controller is given.First,based on the frequency domain model of the system,the analytical expressions of the parameters of the current loop proportional integral(PI)controller and the voltage loop PCI controller are derived,and the influence of the load parameters on the system stability is considered.Then,the expected open loop cut-off frequency and phase margin of current loop and voltage loop are set,and the PI and PCI controller parameters are analytically calculated by this method.Finally,through MATLAB simulation,it is verified that the proposed method can obtain stable output voltage and output current of single-phase inverter under inductive load,and the output current total harmonic distortion(THD)is less than 0.3%.This method can provide guidance for the power supply system control of single-phase inverter rod position detector.