| 引用本文: | 张晓英,程治状,李琛,等.直驱永磁风力发电系统在不对称电网故障下的电压稳定控制[J].电力系统保护与控制,2013,41(18):17-24.[点击复制] |
| ZHANG Xiao-ying,CHENG Zhi-zhuang,LI Chen,et al.Voltage stability control for direct driven wind turbine with permanent magnet synchronous generator in grid asymmetric faults[J].Power System Protection and Control,2013,41(18):17-24[点击复制] |
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| 摘要: |
| 针对直驱永磁风力发电机组（D-PMSG）在不对称电网故障下，负序分量对直流母线电压会产生2倍频振荡的问题，提出利用单相电压延迟60°来构造三相对称电压，消除负序分量对直流母线电压的影响,对D-PMSG在不对称故障下电压跌落的控制策略展开了研究。网侧逆变器外环采用电压环稳定直流电压，控制变换器发出的有功功率，内环采用电流前馈控制，使电压矢量在dq轴间解耦，由外环控制得出的电流参考值来控制逆变器的电流，同时结合能量泄放回路解决D-PMSG在电网发生不对称故障下直流侧的功率拥堵。另外，对网侧动态电压恢复器DVR采用改进的最小能量法控制策略，为系统提供最大无功功率支持，有利于网侧电压恢复，从而保证系统的稳定运行。以河西电网的实时数据进行仿真，结果证明了所提控制策略的有效性。 |
| 关键词: D-PMSG 不对称故障 直流母线 控制策略 动态电压恢复器 |
| DOI：10.7667/j.issn.1674-3415.2013.18.003 |
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| 基金项目:国家自然科学基金资助项目(50967001)；兰州理工大学优秀青年教师培养资助项目(Q200814) |
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| Voltage stability control for direct driven wind turbine with permanent magnet synchronous generator in grid asymmetric faults |
| ZHANG Xiao-ying1,2,CHENG Zhi-zhuang1,LI Chen1,DING Ning1,JIANG Zheng1 |
| () |
| Abstract: |
| When the direct driven wind turbine with permanent magnet synchronous generator (D-PMSG) faces the grid asymmetric faults, the negative sequence component makes DC bus voltage produce 2 times frequency oscillation, thus this paper proposes to form a balanced three-phase voltage based on the single-phase voltage delay 60°theory to eliminate the effect of negative sequence component on DC bus voltage. For grid-side inverter, this paper uses voltage ring to steady DC voltage and control active power of converter in outer loop, and uses current feedforward control in inner loop to make the voltage vector decouple in dq axis and control output current of inverter based on the reference value of current obtained by outer loop control. Meanwhile, this paper uses energy discharge circuit to solve power congestion of DC side for D-PMSG in grid asymmetric faults. In addition, the improved minimum energy control strategy is used for dynamic voltage restorer DVR to provide the maximum reactive power support for the system and recover grid side voltage, so as to ensure the stable operation of the system. The simulation results show the effectiveness of the control strategy depending on real-time data in Hexi grid. |
| Key words: D-PMSG asymmetrical fault DC bus control strategy dynamic voltage restorer |
