电网技术
電網技術
전망기술
POWER SYSTEM TECHNOLOGY
2015年
1期
150-155
,共6页
电磁暂态%权重数值积分%重新初始化%重新同步化%多重开关
電磁暫態%權重數值積分%重新初始化%重新同步化%多重開關
전자잠태%권중수치적분%중신초시화%중신동보화%다중개관
electromagnetic transients%weight-averaged integration%resynchronization%reinitialization%multi-switching events
随着电力电子技术在电力系统中的广泛应用,电力电子开关引起的高频次系统拓扑突变对电磁暂态仿真提出了新挑战,为此,提出了一种电力电子开关仿真插值算法。在全局隐式梯形积分法条件下,该算法在开关动作点通过线性插值计算系统变量,并利用后向欧拉法对系统进行重新初始化,而后根据插值点在当步仿真步长的位置,利用权重法数值积分,灵活改变积分步长,快速积分至仿真整步时间点,对仿真进行再同步。在开关动作过程中,算法仅通过一次插值对仿真进行重新初始化,并在再同步过程中保持节点导纳矩阵不变,且能有效抑制数值振荡。算法在保证精度的前提下,降低了计算负担,提高了计算速度,并考虑了多重开关问题。最后通过算例验证了算法的适应性和有效性。
隨著電力電子技術在電力繫統中的廣汎應用,電力電子開關引起的高頻次繫統拓撲突變對電磁暫態倣真提齣瞭新挑戰,為此,提齣瞭一種電力電子開關倣真插值算法。在全跼隱式梯形積分法條件下,該算法在開關動作點通過線性插值計算繫統變量,併利用後嚮歐拉法對繫統進行重新初始化,而後根據插值點在噹步倣真步長的位置,利用權重法數值積分,靈活改變積分步長,快速積分至倣真整步時間點,對倣真進行再同步。在開關動作過程中,算法僅通過一次插值對倣真進行重新初始化,併在再同步過程中保持節點導納矩陣不變,且能有效抑製數值振盪。算法在保證精度的前提下,降低瞭計算負擔,提高瞭計算速度,併攷慮瞭多重開關問題。最後通過算例驗證瞭算法的適應性和有效性。
수착전력전자기술재전력계통중적엄범응용,전력전자개관인기적고빈차계통탁복돌변대전자잠태방진제출료신도전,위차,제출료일충전력전자개관방진삽치산법。재전국은식제형적분법조건하,해산법재개관동작점통과선성삽치계산계통변량,병이용후향구랍법대계통진행중신초시화,이후근거삽치점재당보방진보장적위치,이용권중법수치적분,령활개변적분보장,쾌속적분지방진정보시간점,대방진진행재동보。재개관동작과정중,산법부통과일차삽치대방진진행중신초시화,병재재동보과정중보지절점도납구진불변,차능유효억제수치진탕。산법재보증정도적전제하,강저료계산부담,제고료계산속도,병고필료다중개관문제。최후통과산례험증료산법적괄응성화유효성。
With wide application of power electronics apparatuses in modern power system, electromagnetic transient program (EMTP) have to face with new challenges due to high-frequent topologic sudden change caused by the action of power electronic valves. For this reason, a new interpolation algorithm for the simulation of power electronic circuits is proposed to ensure the accuracy and reliability of control system. Under the condition of global implicit trapezoidal integration, at the action point of the power electronic valve the proposed algorithm computes system variables by linear interpolation and reinitializes the control system by backward Euler method, then according to the position of the interpolation point in current simulation step the weight-numerical integration is utilized to flexibly adjust the integration step-length and the fast integration is carried out to determine the time point of the resynchronization in the simulation. During the action of power electronic valves, the proposed algorithm reinitialize the simulation via only once of interpolation, and during the reinitialization the nodal admittance matrix is kept unchanged, thus the numerical oscillation can be effectively suppressed. Under the premise of ensuring accuracy, the proposed algorithm can reduce the calculation burden and accelerate the computation, and the multiple-switch problem is taken into account. Both adaptability and effectiveness of the proposed algorithm are validated by case study.