As distributed generations (DGs) gradually convert the distribution networks (DNs) from passive to active distribution networks (ADN), voltage stability assessment (VSA) is not suitable to treat the transmission and d...
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ISBN:
(纸本)9781728119816
As distributed generations (DGs) gradually convert the distribution networks (DNs) from passive to active distribution networks (ADN), voltage stability assessment (VSA) is not suitable to treat the transmission and distribution networks separately. A distributed voltage stability contingency screening and ranking method for integrated transmission and distribution (T-D) networks is proposed, which includes two stages. In Stage 1, distributedpowerflow of integrated T-D networks is used to quickly screen out critical contingencies where there are no powerflow solutions at the operating conditions calculated by distributed continuation power flow (DCPF) of integrated T-D networks under the predefined load margin threshold. In Stage 2, the load margins of critical contingencies are calculated and ranked by look-ahead quadric curve fitting method based on DCPF. Numerical simulations on an integrated system composed of an IEEE30-bus transmission network (TN) and two IEEE33-bus DNs show that the proposed method can be fast and reliable to achieve voltage stability contingency screening and ranking for integrated T-D networks.
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