基于双PWM变流器水电并网结构的水轮机发电仿真分析  

Simulation analysis of turbine generation based on grid connected structure of dual PWM converter

作　　者：熊飞 张莉平 XIONG Fei;ZHANG Liping(Gongzui Hydroelectric Power Plant of Guoneng Daduhe Company,Leshan,Sichuan 614900,China)

机构地区：[1]国能大渡河公司龚嘴水力发电总厂,四川乐山614900

出　　处：《自动化与仪器仪表》2024年第8期325-328,共4页Automation & Instrumentation

摘　　要：针对水轮机发电系统运行不稳定的问题,研究提出了一种基于双脉冲宽度调制变流器的水电并网系统结构及控制策略。其中,对于机侧控制,引入单位功率因素和弱磁控制,对于网侧控制引入直接功率控制策略。结果显示,在机侧控制中,当在0.5 s负载发生变化时,电机的转速增大到1680 r/min。随后转速逐渐下降,且在0.03 s内趋于稳定。同时,在网侧控制中,在0.5 s时,直流母线的实际电压从650 V增加至710 V,但在0.025 s内迅速降低并稳定在设定值。说明研究所提出的机侧及网侧控制策略能够有效地应对需求负载的变化,并保持电机转速和直流母线电压的稳定,其为水轮机发电系统的稳定运行提供了有力保障。Aiming at the unstable operation of water turbine power generation system,a structure and control strategy of hydropower grid connection system based on double pulse width modulation converter is proposed.Among them,for machine side control,unit power factor and weak magnetic control are introduced,and direct power control strategy is introduced for network side control.The results show that in the machine side control,the rotation speed of the motor increases to 1680 r/min when the load changes at 0.5 seconds.Subsequently,the rotational speed gradually decreased and stabilized in 0.03 s.Meanwhile,in the network side control,the actual voltage of the DC bus increases from 650V to 710 V at 0.5 s,but it is rapidly reduced and stabilized at the set value within 0.025 s.It shows that the machine side and network side control strategies proposed by the institute can effectively deal with the change of demand load,and maintain the stability of the motor speed and DC bus voltage,which provides a strong guarantee for the stable operation of the turbine power generation system.

关 键 词：双PWM变流器 水电并网 水轮机发电 PMSG 

分 类 号：TM612[电气工程—电力系统及自动化] TP29[自动化与计算机技术—检测技术与自动化装置]