中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2012年
1期
78-83
,共6页
董清%梁晶%颜湘武%杨瑞静
董清%樑晶%顏湘武%楊瑞靜
동청%량정%안상무%양서정
电网%低频振荡%扰动源%定位%希尔波特(Hilbert)变换
電網%低頻振盪%擾動源%定位%希爾波特(Hilbert)變換
전망%저빈진탕%우동원%정위%희이파특(Hilbert)변환
power grid%low frequency oscillation%disturbance source%location%Hilbert transform
由于中国电网规模庞大，低频振荡现象时有发生，如何快速确定低频振荡扰动源并及时将其切除，对保障电网的安全稳定运行意义重大。当电网中发生低频振荡时，根据传播到电网中不同位置的特殊形状扰动行波具有的相似性特点，提出一种比较多点测量数据波形相似度以确定低频振荡扰动源位置的定位方法，针对在电网中不同地点一段时间内同时采样的电压数据，利用希尔波特（Hilbea）变换提取各采样点的电压扰动变量并将其传送至监控单元，在监控单元利用定义的顺序相似度函数提取扰动行波通过各相邻采样点问的时差和先后次序，利用各采样点问已知的线路长度计算波速并确定低频振荡扰动源的位置。通过一个7机无穷大系统模型的仿真分析，验证该方法的正确性和准确性。理论分析和仿真结果表明：该方法能够快速确定电网中低频扰动源的位置；而且所需的采样测量单元数量少，能够节省大量投资。
由于中國電網規模龐大，低頻振盪現象時有髮生，如何快速確定低頻振盪擾動源併及時將其切除，對保障電網的安全穩定運行意義重大。噹電網中髮生低頻振盪時，根據傳播到電網中不同位置的特殊形狀擾動行波具有的相似性特點，提齣一種比較多點測量數據波形相似度以確定低頻振盪擾動源位置的定位方法，針對在電網中不同地點一段時間內同時採樣的電壓數據，利用希爾波特（Hilbea）變換提取各採樣點的電壓擾動變量併將其傳送至鑑控單元，在鑑控單元利用定義的順序相似度函數提取擾動行波通過各相鄰採樣點問的時差和先後次序，利用各採樣點問已知的線路長度計算波速併確定低頻振盪擾動源的位置。通過一箇7機無窮大繫統模型的倣真分析，驗證該方法的正確性和準確性。理論分析和倣真結果錶明：該方法能夠快速確定電網中低頻擾動源的位置；而且所需的採樣測量單元數量少，能夠節省大量投資。
유우중국전망규모방대，저빈진탕현상시유발생，여하쾌속학정저빈진탕우동원병급시장기절제，대보장전망적안전은정운행의의중대。당전망중발생저빈진탕시，근거전파도전망중불동위치적특수형상우동행파구유적상사성특점，제출일충비교다점측량수거파형상사도이학정저빈진탕우동원위치적정위방법，침대재전망중불동지점일단시간내동시채양적전압수거，이용희이파특（Hilbea）변환제취각채양점적전압우동변량병장기전송지감공단원，재감공단원이용정의적순서상사도함수제취우동행파통과각상린채양점문적시차화선후차서，이용각채양점문이지적선로장도계산파속병학정저빈진탕우동원적위치。통과일개7궤무궁대계통모형적방진분석，험증해방법적정학성화준학성。이론분석화방진결과표명：해방법능구쾌속학정전망중저빈우동원적위치；이차소수적채양측량단원수량소，능구절성대량투자。
When there was a lower frequency oscillation in power grid, the transient wave with special form propagates everywhere in the transmission line. A new method for locating the disturbance source of low frequency oscillation was proposed in the paper based on the correlation function of obtained disturbance voltage variable. The voltage of same phase at different places in power grid was measured during the same time when low frequency oscillation was taking place. The disturbance variable of voltage was obtained by Hilbert transform and sent to the monitor unit. The time delay and sequence between the two voltage measuring units were calculated by correlated function in monitor unit when the disturbance voltage passed through them. The location of disturbance source of low frequency oscillation was calculated by the length of transmission line and the time delay. The validity of this proposed method was verified by a simulating model with seven generators and an infinite system. The results of theoretical analysis and simulating test show that the location of low frequency oscillation source can be determined quickly. At the same time, the number of required measuring units is very small and huge investment in it can be reduced.
