Abstract
Peak-shaving capability mainly refers to the capability of the power system to maintain the balance between the active output and load balance in real-time. Sufficient peak-shaving capability is one of the important conditions to ensure the security and stability of the power system. The access of multi-infeed ultra-high voltage will largely weaken the peak-shaving capability of the power system and thus increase its peak-shaving pressure. This paper first introduces the characteristics of renewable energy generation such as wind generation and photovoltaic generation since a large amount of renewable energy from the sending-end system through several UHV delivery often increases the peak-shaving pressure of the receiving-end power system. On this basis, it analyses the impact of multi-infeed UHV on peak-shaving of power system. Then, an evaluation method that uses equivalent peaking capacity to measure the peak-shaving capability of the UHV receiving-end power system with multi-infeed UHV is proposed. Finally, Zhejiang Power System is used as an example to evaluate its peak-shaving regulation capability in the typical years and the typical day using the proposed method.
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