Equivalent Load Model Indentification And Static Voltage Stability Analysis With Wind Generation Integration

In addition to large-scale wind power integration, the wind power, which is closely connected with the load, is also widely integrated into distribution network. From the perspective of the high voltage side of the distribution network, the distribution network load is not a strict sense of the load, which may contain a part of the power supply. So the traditional equivalent load model for the power system analysis needs to consider the influence of wind power access on the load model. At the same time, the change of the equivalent load characteristic has a direct effect on the static voltage stability of the system. In this paper, In order to solve the problem of equivalent load model identification, a new equivalent load model including wind power is established, and the influence of wind power integration on the static voltage stability of the system is analyzed by using the model. This paper provides a new method for the identification of equivalent load model and static voltage stability analysis.First of all, according to the randomness of wind power output, the wind speed is introduced as a variable load model to establish the equivalent load model. Different from the measured data of the traditional load modeling, Wind speed has a large range of volatility and strong randomness. According to the characteristics of load measurement data, this paper utilizes the density based clustering algorithm(DBSCAN) to mine the core data, the results of this algorithm meet the requirements of this paper. Taking the complexity of the load characteristics into account, this paper chooses the neural network load model, and uses the measured data to identify the model. By comparison with the sampling data, the result shows that the model has a better fitting effect.Then, due to the wind power components, the equivalent load model established in this paper is more complicated. In the view of this characteristic, this paper proposes the continuous flow of the equivalent load model with wind power. The complexity of the equation of equivalent load model determines the difficulty of solving the Jacobi matrix in the process of continuous power flow calculation, so this paper derives the solution of Jacobi matrix. The traditional load growth model is be unable to use in the equivalent load model, Through the example analysis of continuous power flow, the load growth model is re designed, and the continuous power flow calculation method is proposed in this paper.Finally, based on the equivalent load model, this paper by consideration the effects of wind power access the static voltage stability of the system under different scenarios through continuous power flow calculation. By comparing the influence of different access position of wind power on the static voltage stability of the system, a new evaluation index of the influence from the angle of unit capacity is put forward. Explore the growth in different load conditions, wind power for the static voltage stability of the system and analysis summarize different load growth of wind power on the main factors affecting the static voltage stability of the system.