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Load is one of the most basic parts of power systems. As power system load increases steadily and related problems like voltage stability tend to be severer, load modeling is becoming more and more important in power system stability analysis and control. However, because of load characteristics like non-linearity, randomness and time-variation, load modeling and parameter identification still remain...
This paper is concerned about real-time modeling and identification of dynamically changing loads in power systems. An exponential dynamic load model was proposed earlier and was well accepted by several investigators who worked on this paper. This paper considers this model and identifies its parameters in real-time based on synchronously sampled measurements. An unscented Kalman filter is used to...
Load is one of the most important parts of power system and imposes great impact on stability of the system. Proper modeling and parameter identification of load are instructive for power system stability study and control. However, because of the nonlinearity, randomness and time-variation, load modeling and parameter identification remain a big problem in power system simulation and stability analysis...
Accurate modeling and parameter identification of electrical load is always a difficult problem, remaining unsolved but critical for stability analysis, prediction and decision-making of power systems. The development of wide area measurement system (WAMS) provides possible way's to further address the challenge. In this work, based on an existing load modeling method for online identification of...
In this paper, we propose a new component-based dynamic model, in which the parallel connection of induction motor and constant-impedance is applied to describe the load of power network. The original data for parameter identification is derived from network dynamics calculations. Consider the compositions of load are varying with time, season and weather, the different incentives and responses can...
Dynamic equivalent has been a basic approach for analysis and computation of large scale-increasing interconnected power systems in China. Security defense of power systems and real-time monitoring of system states require more rapid and effective computation of large power grids. This paper introduces a solution for real-time dynamic equivalent of large multi-area power systems. It is based on real-time...
Essentials of power system dynamic behavior, the character and difference index of disturbed trajectories are summed up in this paper. The model verification and parameter identification methods based on difference index of disturbed trajectories are reviewed, as well as the existed problems and possible development. The index should not be based on conventional signal processing technologies only;...
For current practices on the measurement-based load modeling, the dispersity of the identification results is an obstacle in the application of the load model. Based on the improvement of the basic genetic algorithm and the sensitivity analysis of composite load model parameters, this paper proposed a new identification strategy, in which the majority of parameters are fixed and only the parameters...
This paper presents the results of parameter identification of static load characteristics on the basis of large number of field tests. The parameters of most frequently used, polynomial and exponential load model are determined using two different ways of normalization - normalization with voltage and power values just before the voltage change, and normalization with rated voltage and power values...
Distributed resources (such as wind turbines) can provide power to local loads in the electrical distribution system as well as benefits such as improved reliability. As more wind energy is connected to utility systems, it becomes important to understand and manage the impact of wind generation on system operations. This paper studies the impact of wind generation on load modeling of distribution...
Load modeling plays an important role in power system stability analysis and planning studies. The parameters of load models may experience variations in different application situations. Choosing appropriate parameters is critical for dynamic simulation and stability studies in power system. This paper presents a method to select the parameters with good generalization ability based on a given large...
The load places a very important role in power system stability. It greatly affects the system stability assessment results of a power system to a large extent. This paper focuses on the realization of aggregate load area model (ALAM) analysis. The ALAM model is based on the output of a power system wide area measurement system (WAMS). The parameter identifiability regarding the ALAM is studied in...
A load parameter identification method based on wide area information of power system is presented. Load parameters are identified by fitting the wide area dynamic characters, such as generator angle in this paper. Load parameters of wide area identification can not only simulate the local load dynamic characters but also reflect the wide area system dynamic characters, especially the character of...
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