| 引用本文: | 吉正华,韦芬卿,杨海英.基于dq变换的三相软件锁相环设计[J].电力自动化设备,2011,31(4): |
| JI Zhenghua,WEI Fenqing,YANG Haiying.Three-phase software phase-locked loop based on dq reference frame[J].Electric Power Automation Equipment,2011,31(4): |
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| 摘要: |
| 针对传统锁相环在电压畸变条件下不能获得准确相位的问题，根据软件锁相环（SPLL）原理，提出了一种基于dq坐标变换原理获得SPLL线性化模型，并通过PI控制实现的新型三相SPLL。在三相电压不平衡时，利用T／4（T为三相电压周期）延时计算法实现正、负序分量分离，有效地抑制负序分量对相位的影响。通过仿真实验系统，对提出的控制策略在各种电压畸变及三相电压不平衡条件下进行验证，结果表明，该SPLL的动态响应速度快、稳态性能好，并对电压畸变有很强的抑制作用。 |
| 关键词: 软件锁相环 dq坐标变换 畸变电压 正、负序分量 |
| DOI： |
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| 基金项目:国家电网公司科研项目资助 （SG0833） |
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| Three-phase software phase-locked loop based on dq reference frame |
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JI Zhenghua1, WEI Fenqing2, YANG Haiying1
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1.NARI Technology Development Limited Company，Nanjing 210061，China;2.State Grid Electric Power Research Institute，Nanjing 210003，China
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| Abstract: |
| As the traditional PLL（Phase-Locked Loop） can not obtain accurate phases under distorted voltage，a linear model of SPLL（Software Phase-Locked Loop） based on dq coordinate transform theory is proposed and a new three-phase SPLL is achieved by PI control. When the three-phase voltage is unbalanced，the T／4 shift method is used to separate the positive and negative sequence components，which effectively inhibits the influence of negative sequence component on phase calculation. The proposed control strategy is simulated with the experimental system for different voltage distortions and unbalanced three-phase voltages. Results show that the presented SPLL greatly suppresses the voltage distortion，with fast dynamic response and good steady performance. |
| Key words: SPLL dq coordinate transform distorted voltage positive and negative sequence components |
