| 引用本文: | 李 群,熊杰锋,杨志超,解 兵.基于多周期同步采样宽带移相法的新型电网无功测量方法[J].电力自动化设备,2014,34(6): |
| LI Qun,XIONG Jiefeng,YANG Zhichao,XIE Bing.Reactive power measuring based on multi-cycle synchronous sampling and wide-band phase-shifting[J].Electric Power Automation Equipment,2014,34(6): |
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| 摘要: |
| 基于多周期同步采样宽带移相法，提出了一种电网无功数字测量新方法。多周期同步采样用100 MHz高频脉冲对电网频率进行测量跟踪，保证10个周期采样同步误差小于0.03%；设计的宽带移相滤波器组在带宽45～4 955 Hz内实现90° 相移，相移误差0.01°，其暂态过渡时间最大为67 ms。给出了实现该方法的具体硬件配置。仿真结果表明，相对传统方法，所提方法精度更高，可在每10个周期内实现电网无功的高精度测量。 |
| 关键词: 电网 无功 测量 多周期同步采样 宽带移相滤波器 测量误差 |
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| Reactive power measuring based on multi-cycle synchronous sampling and wide-band phase-shifting |
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LI Qun1, XIONG Jiefeng1,2, YANG Zhichao3, XIE Bing1
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1.Jiangsu Electric Power Research Institute，Nanjing 210000，China;2.School of Electric Power Engineering，Nanjing Institute of Technology，Nanjing 211167，China;3.School of Electric Power Engineering，Nanjing Institute of Technology，
Nanjing 211167，China
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| Abstract: |
| A digital measuring method of grid reactive power is proposed based on multi-cycle synchronous sampling and wide-band phase-shifting. The 100 MHz pulse is adopted in the multi-cycle synchronous sampling to measure and trace the frequency of power grid，which guarantees the synch error less than 0.03 % for 10 cycles. The designed wide-band phase-shift filter group realizes 90° phase shift of wide band from 45 to 4 955 Hz，with the phase shift error of 0.01° and the maximum transient transition time of 67 ms. The hardware configuration is given. The simulative results show that，compared with the traditional method，the proposed method realizes the reactive power measuring per 10 cycles with higher precision. |
| Key words: electric power systems reactive power measurements multi-cycle synchronous sampling wide-band phase-shift filter measurement errors |
