A Method of Capacity Credit Calculation of DC Transmission Line Based on State Sequence

As the proportion of renewable energy in the HVDC supported power supply gradually increases, the traditional method of calculating capacity credit based on the rated capacity of HVDC is no longer applicable. Therefore, it is necessary to accurately calculate the capacity credit of DC channel and determine the sufficiency of power system for the analysis of power supply and demand situation. To solve this problem, this paper proposes a DC transmission line capacity credit calculation method based on state sequence. This method calculates the capacity credit by constructing the joint output state sequence of the sending base, DC line and thermal power unit in receiving areas on the basis of clarifying the concept of DC channel capacity credit. At the same time, this paper verifies the effectiveness of the proposed method through the test case, and analyzes the sensitivity of the main factors affecting the capacity credit.