提高风力发电网侧变流器低电压运行能力的研究  

Research on Improvement of Low Voltage Ride Through Capability for Grid-connected Inverter in Wind Power System

作　　者：谭国俊[1] 张亮[1] 张文明 赵艳萍[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008 [2]河南科瑞科技有限公司技术部,河南郑州450000

出　　处：《电气传动》2011年第1期18-21,共4页Electric Drive

摘　　要：风力发电机组中,当电网电压跌落时,网侧变流器同时受到来自网侧和负载侧两方面的扰动很容易发生直流母线电压不稳定的现象,会进一步影响系统的稳定和恢复能力。为了提高风力发电系统的低电压穿越能力,提出了利用变流器网侧和负载侧功率平衡关系动态改变电流前馈增益系数的方法,同时抵抗电网电压扰动和负载扰动。仿真验证了该方法的有效性,同时具有良好的动静态性能。In wind power system,the grid voltage and load current would disturb the grid-connected invert- er at the same time when the grid voltage drops down. Then the DC-link voltage is difficult to maintain stabili- ty , which would further influence the system stability and restore ability. To improve low voltage ride through capability in wind power system, an improved method was put forward based on the balance of grid side power and load side power which can dynamically change the gain coefficient of the current feed-forward to resist both grid voltage and load current disturbance. The simulation results confirm the validity and present good dynamic and static performance.

关 键 词：风力发电系统 前馈控制 抗电网电压扰动 抗负载扰动 

分 类 号：TM402[电气工程—电器]