| 引用本文: | 杨达亮,卢子广,杭乃善.新型单相电压暂降实时检测方法及实现[J].电力自动化设备,2015,35(2): |
| YANG Daliang,LU Ziguang,HANG Naishan.Method and realization of real-time single-phase voltage sag detection[J].Electric Power Automation Equipment,2015,35(2): |
|
| 摘要: |
| 针对单相系统电压暂降的检测，提出一种用相电压虚构出三相电压信号的新型检测方法。根据单相交流电压信号离散数据，利用相线电压相量关系，通过移相角度30° 虚构出三相电压信号。所提出的检测方法幅值变化延时仅为电网工频周期的1／12，理论延时为1.67 ms，与目前延时3.33 ms的瞬时电压dq分解法和延时5.0 ms的αβ检测法相比，实时性进一步提高。根据给定的30° 相位差选择离散数据的间隔，并对采样频率的选取进行深入分析，以提高检测精度。针对检测延时时间、“检测异常”情况进行仿真，结果验证了所提方法的正确性和有效性。 |
| 关键词: 电压暂降 电能质量 电力系统 电压控制 仿真 |
| DOI： |
| 分类号: |
| 基金项目:广西科技攻关计划项目（桂科攻1348007-4） |
|
| Method and realization of real-time single-phase voltage sag detection |
|
YANG Daliang, LU Ziguang, HANG Naishan
|
|
College of Electrical Engineering，Guangxi University，Nanning 530004，China
|
| Abstract: |
| A method of voltage sag detection for single-phase system is presented，which forms the fictitious three-phase voltage signals based on the single-phase voltage signals. Based on the sampled discrete data of single-phase voltage signals，the fictitious three-phase voltage signals are created by 30° phase-angle shift according to the phasor relationship among phase voltages. The time delay of the proposed detection method is just 1／12 grid period and the theoretical time delay is 1.67 ms. Compared with the 3.33 ms delay of the instantaneous voltage dq conversion method and the 5.0 ms delay of the α β detection method，it has better real-time performance. The interval of discrete data is set according to 30° phase-angle shift. The sampling frequency is analyzed in detail for improving the detection accuracy. The correctness and effectiveness of the proposed method are verified by the results of detection delay simulation and“detection abnormality” simulation. |
| Key words: voltage sag power quality electric power systems voltage control computer simulation |
