Distributed Static Transmission-Distribution Voltage Stability Assessment
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In the context of increasing DG integration, whether it is necessary to perform a static Transmission-Distribution VSA (TDVSA) and how to perform the static TDVSA have not been fully understood yet. Currently, transmission VSA (T-VSA) and distribution VSA (D-VSA) are separately performed by TCCs and DCCs, respectively. More specifically, a TCC simplifies a DPS as a load injection at the boundary bus, whereas a DCC simplifies the TPS as a slack bus at the boundary bus. However, these simplifications are questionable when the system loading approaches the critical point, because the slack bus may not be “slack” any longer and also because the originally neglectable power losses along distribution feeders may not be ignored. In addition, potential DG tripping in a low-voltage condition also complicates the operational state of a DPS, which is hardly represented by the above simplifications. Considering these issues, we believe that it is time to reconsider the validity of the separately performed T-VSA and D-VSA.
KeywordsBoundary Buses Load Injection On-load Tap Changer (OLTC) Power Flow Equations Step Length Regulation
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