Load modeling has significant influence on the results of power system dynamic analysis. In the analysis of power system stability, if improper load model is adopted, which may result in inconsistent and even contradictory consequences of the system. The consequences of the CIGRE working group show that using accurate load model can help the operating personnel to estimate the operating limit of the system accurately. In other words, the load model which is quite different from the actual situation may get the wrong analysis results, resulting in the use of improper control measures in the system operation, thus further worsening the operating conditions of the system, and eventually lead to serious consequences: system disaggregation or collapse. According to the survey results of the load composition of 1343 220kV substations in 4 provinces and 1 cities in North China, this paper divides the load stations of North China power grid into five categories, such as ordinary industrial load, commercial mixed load of residents, commercial mixed load of industrial residents, mixed load of commercial agriculture and high energy consumption load of industrial residents, a detailed survey of distribution network, load composition and load characteristics is carried out in various typical 220kV load stations. According to the detailed survey results, the integrated negative load model (SLM) parameter of the distribution network is examined by using the statistical integrated load model software to establish 5 types of 23 typical 220kV sites in North China Power grid. The comprehensive load model of various load types of North China Power Grid is unified and merged, for the North China Power Grid, Respectively recommend the common industrial load, energy intensive load residents load for commercial, industrial and commercial mixed load residents, industrial commercial agriculture mixed load after polymerization characteristic of the comprehensive load model considering the distribution network parameter. Through the SLM model of statistical site and the unified SLM model of all kinds of load, the simulation comparison needs to be done according to the stable condition and the critical condition respectively. The simulation results show that the SLM model of each statistical site has high accuracy even under critical operating conditions.

Load model; load type; North China Power Grid; power system; synthesis load model

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