Abstract
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.
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Notes
- 1.
In this chapter, we assume that (1) the load direction is proportional to the base-case load value; (2) the generation increase direction is proportional to the difference between the generation capacity and the base-case active output; and (3) the load direction is normalized so that λ = 1 corresponds to a 100-MW load increase. In fact, other assumptions regarding the power increase direction can also be used in the TDVSA method.
- 2.
Part of the content in this chapter has been published by IEEE:
(1) © [2017] IEEE. Reprinted, with permission, from “Impact of Coupled Transmission-Distribution on Static Voltage Stability Assessment”, IEEE Transactions on Power Systems, vol. 32, no. 4, 2017.
(2) © [2017] IEEE. Reprinted, with permission, from “A Distributed Transmission-Distribution-Coupled Static Voltage Stability Assessment Method Considering Distributed Generation”, accepted by IEEE Transactions on Power Systems.
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Li, Z. (2018). Distributed Static Transmission-Distribution Voltage Stability Assessment. In: Distributed Transmission-Distribution Coordinated Energy Management Based on Generalized Master-Slave Splitting Theory. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-10-7971-9_5
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DOI: https://doi.org/10.1007/978-981-10-7971-9_5
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