CAJ | 학술논문

分散下垂控制策略的孤岛微电网，系统中没有平衡节点，多个下垂控制的分布式电源(distributed generator，DG)装置参与系统频率的调节并达到新的频率稳态值，传统配电网潮流计算方法将不再适用。针对分散下垂控制策略的孤岛微电网潮流计算，提出基于BFGS信赖域算法的潮流计算新方法。把DG装置处理为PQ节点、PV节点和下垂节点3种类型，建立下垂节点潮流计算模型；分析非线性节点功率方程组的求解，并将其转化为无约束最优化问题，再采用带BFGS修正的信赖域算法进行求解，得到系统稳态频率及各节点电压。对改造后的37节点孤岛微电网系统应用提出的方法进行潮流计算，验证了算法的正确性和有效性。
분산하수공제책략적고도미전망，계통중몰유평형절점，다개하수공제적분포식전원(distributed generator，DG)장치삼여계통빈솔적조절병체도신적빈솔은태치，전통배전망조류계산방법장불재괄용。침대분산하수공제책략적고도미전망조류계산，제출기우BFGS신뢰역산법적조류계산신방법。파DG장치처리위PQ절점、PV절점화하수절점3충류형，건립하수절점조류계산모형；분석비선성절점공솔방정조적구해，병장기전화위무약속최우화문제，재채용대BFGS수정적신뢰역산법진행구해，득도계통은태빈솔급각절점전압。대개조후적37절점고도미전망계통응용제출적방법진행조류계산，험증료산법적정학성화유효성。
The islanded microgrid under decentralized droop control strategy does not have a balance node, and several distributed generator (DG) units with droop controllers participate in the regulation of system frequency which finally reaches a new steady value, so the traditional distribution network power flow calculation methods can not apply to it. Aiming at power flow calculation of the islanded microgrid under decentralized droop control strategy, a new power flow calculation method based on BFGS trust region algorithm was proposed in this paper. DG units were taken as three node types of PQ node, PV node and droop node, and power flow calculation model of droop node was established. The solving of nonlinear node power flow equations was analyzed. Further, the solving of nonlinear equations was converted for a unconstrained optimization problem, and a trust region algorithm with BFGS correction was proposed for solving it so that system steady frequency and each node voltage were obtained. The proposed method was performed on 37-node islanded microgrid, and results testify the correctness and validity.