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The load model is of great importance for voltage stability in power systems. The model structure and model coefficients of different load models will affect the voltage regulation. This paper analyzes the correlation and the relationship between load model and voltage stability. It is found that, if the different load models under the same voltage regulation control strategy can be analyzed, it can provide an important basis for the simulation modeling of voltage stability and the rationality of the voltage regulation strategy in the power system. Therefore, based on the openDSS software, the IEEE33 node is taken as an example to analyze the voltage stability of different load models during the SVR voltage regulation process. Introduction In recent years, the scale of China's power grid has been expanding. The complexity of power system operation is increasing. It is necessary to adopt a mathematical model which is closer to reality, to simulate the operation of the power system effectively. Therefore, various simulation analysis of the power system must select the appropriate mathematical model for each component firstly. Voltage stability is essentially load-stable, and the characteristics of load are important for voltage stability studies. According to whether the dynamic characteristics of the load are reflected, the load model can be generally divided into two types: static model and dynamic model. The structure of the basic static load model is: power function model; polynomial model. The static load model is primarily used in power flow calculations and steady state analysis based on power flow calculations. In [1], the load modeling is carried out by the measured data of the power system. Finally, the impact characteristic model of load is proposed. In [2], a solution and specific implementation method, which adapted to the requirements of smart grid simulation, are proposed for on-line quasi-real-time correction of integrated load model parameters. At present, most researches on load modeling are numerous, but the analysis of the load model to the SVR voltage regulation problem is rare. In this paper, four different load models are applied to the voltage regulation problem respectively. By analyzing the influence of different load models on the voltage regulation under the same voltage regulation strategy, the optimal load model is analyzed in the future voltage regulation modeling simulation. Load Model Beause SVR voltage regulation is the voltage stability problem, it belongs to power flow calculation. Therefore, the static load model is mainly used in this paper, and the static load model of power system can be subdivided into four types, which are constant impedance model (CZ), constant current model (CI), constant power model (CP), and ZIP model. The ZIP model consists of three basic components of different proportions, as shown in Figure 1, where Z is the constant impedance, I is the constant current, and P is the constant power.

The Characteristics of Voltage Regulation with SVR Considering Load Model