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| 摘要: |
| 分析了同步发电机直流励磁机控制方案中自励系统和他励系统方式存在调磁电阻损耗大、励磁系统效率低的缺点,提出采用直流斩波技术对直流励磁机控制方案进行改造和优化。自励直流斩波励磁系统的上位机选用工业控制机,应用工程设计法设计调节器,选用可编程控制器(PLC)为控制器,对励磁进行自动控制。上位机通过RS-485和PLC通信,PLC接受上位机的控制命令,实时传送现场工况(同步机发出的电压、电流;励磁电压、电流及计算的有功、无功功率)。根据同步机的数学模型、脉宽调制控制的斩波器的数学模型,应用工程设计法确定其调节器的控制算法为比例积分微分(PID)调节。该系统已在一小型水电站投入使用。 |
| 关键词: 直流斩波技术,励磁改造,可编程控制器 |
| DOI： |
| 分类号:TM33 TM73 |
| 基金项目: |
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| Application of chopped wave technique in excitation system reconstruction of small hydropower plant |
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DONG Feng-bin HUANG Jin-feng
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| Abstract: |
| The reconstruction and optimization of DC dynamo excitation is performed for synchro-generator by using the DC chopped wave technique to reduce its resistive loss and enhance the excitation efficiency under self-and separate-excitation modes.The industrial control computer is adopted as the superordinate computer of the self-excited DC chopped wave excitation system and the PLC(Programmable Logic Controller) is adopted for automatic excitation control.The regulator is designed with the engineering design method.The PLC receives control commands from the superordinate computer and transmits local parameters to it real-timely via RS-485,such as the generator voltage and current,the excitation voltage and current,the calculated active and reactive powers.According to mathematical models of generator and PWM(Pulse Width Modulation)-control-led wave chopper,the PID(Proportional-Integral-Derivative) control algorithm is selected by the engineering design method for its regulator.The proposed system runs in a small hydropower plant. |
| Key words: chopped wave technique,excitation system reconstruction,PLC |
