配电变压器的非线性自动调压系统设计

Design of Nonlinear Automatic Voltage Regulation System for Distribution Transformer

为了提高配电变压器输出电压的稳定性,设计了一种新的配电变压器非线性自动调压系统。介绍了配电变压器非线性自动调压系统升压部分设计过程,主要包括升压变压器、交流接触器以及过电保护装置,给出电路图。分析了自动控制部分设计过程,包括电压检测电路、A/D转换电路以及控制电路。当配电变压器中的电压改变时,通过微处理器对采集的电压进行处理,在指定端口输出低电平,采用小型中间继电器对接触器的断开、闭合状态进行控制,以实现电压控制。按照系统性能要求对触发电路进行设计,给出反并联晶闸管模块触发电路。分析了触发电路半导体器件参数选择过程,经测试发现反并联晶闸管触发导通后,电压波形稳定,负载波形几乎无变形。对设计的非线性自动调压系统进行测试,设计系统能够保证配电变压器输出电压的稳定性。

In order to improve the stability of distribution transformer output voltage,a new nonlinear automatic voltage regulation system of distribution transformer is designed.The design process of the step-up part of the nonlinear automatic voltage regulation system of the distribution transformer is introduced,which mainly includes stepup transformer,AC contactor and overcurrent protection device,and the circuit diagram is given.The design process of automatic control part is analyzed,including voltage detection circuit,A/D conversion circuit and control circuit.When the voltage distribution transformer is changed,through the acquisition of voltage microprocessor in the designated port output low level,using a small intermediate relay to control the opening and closing state of the contactor,to realize voltage control.According to the system performance requirements,the trigger circuit is designed,and the trigger circuit of the anti parallel thyristor module is given.The selection process of semiconductor device parameters of trigger circuit is analyzed.It is found that the voltage waveform is stable and the load waveform is almost no distortion after the thyristor is triggered.The design of the nonlinear automatic voltage regulation system is tested,and that the design system can guarantee the stability of the distribution transformer output voltage.