Abstract：The new energy base plans to construct a grid type converter station to support the integration of new energy into the grid through direct current transmission, in scenarios far away from synchronous power sources. The short-circuit current on both sides of the new energy AC collection system power line in the base is provided by different types of power electronic converters, and the fault current exhibits limited, distorted characteristics and waveform distortion, resulting in random changes in the fundamental frequency amplitude and phase angle characteristics perceived by the protection device, causing deterioration of the differential protection action performance, and even the risk of refusal, making it difficult to ensure the safe operation of the system and urgently requiring new principles of longitudinal protection. The existing longitudinal protection research can be divided into frequency domain protection and time domain protection based on the utilized feature quantities. Therefore, existing frequency-domain feature-based protection relies on extremely high sampling frequencies and is susceptible to factors such as noise, while existing time-domain feature-based protection does not require extremely high sampling frequencies, but there is a risk of incorrect action performance in different scenarios. Therefore, this article proposes a new principle of longitudinal protection based on time-domain distribution entropy, which accurately distinguishes faults inside and outside the area by utilizing the difference in phase frequency characteristics of the currents on both sides. Compared with existing research on protection, it has better ability to withstand abnormal disturbances and solves the problem of decreased performance of differential protection in the absence of synchronous power supply. The protection performance was comprehensively tested and compared in different fault scenarios on the RTDS hardware in the loop experimental platform. The experimental results showed that the proposed protection can withstand a transition resistance of 150 Ω and 20 dB noise, and can ensure that the protection does not misoperate when encountering abnormal values.
刘昊霖, 贾科, 毕天姝, 李再男, 张旸. 基于时域分布熵的新能源基地汇集系统线路相似度保护[J]. 电工技术学报, 2025, 40(17): 5514-5525.
Liu Haolin, Jia Ke, Bi Tianshu, Li Zainan, Zhang Yang. Similarity Protection of New Energy Base Collection System Lines Based on Time-Domain Distribution Entropy. Transactions of China Electrotechnical Society, 2025, 40(17): 5514-5525.
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2025, Vol. 40 
