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VF (Variable Frequency) based motor drive, which occupies a large proportion in total power load, is growing up rapidly these years. It shall affect the load model of power system greatly, for their characteristic is quite different from that of traditional asynchronous motor drive. Firstly, both the simulation and physical experiment on VF motor are carried out with voltage drop disturbs, and the...
It is urgent for modern society to save energy and protect environment. But the efficiency of traditional lighting equipment which occupies a rather high proportion of total electric load is very low. Now, they are more and more instead by power electronics based devices, such as energy-saving lamps or LED lamps. For the different characteristics from that of traditional devices, the new kind of lighting...
Power electronics based energy-saving technology has being developed rapidly in recent years. It is an inevitable trend for traditional load devices to be upgraded with power electronics technology. For example, more and more motor drives, which occupies a large proportion in total power load, change from asynchronous motors to Variable Frequency (VF) motor drives. Thus, the actual features of electrical...
The conventional constant frequency airconditioner (CFAC) and the inverter based variable-frequency air-conditioner (VFAC) are increasingly used now. The study of air-conditioner based load and its impact on power system is greatly demanded. In this paper, the characteristics of CFAC and VFAC are investigated, respectively. Then, a modeling method of blended air-conditioner (BAC) load is proposed,...
A fuzzy decoupling technique is proposed for model validation of large-scale power systems. To solve the problem of incredibility lying in power system dynamic simulations, a wide area pattern (WAP) is defined which reflects the parameter effects of certain component to the space-time trajectories, especially with consideration of the characteristics of huge amount of measurements and model parameters...
A Synthesis Load Model (SLM) including both the power load and the distribution network has been proposed in the references. The identifiability of SLM is analyzed at first, it is concluded that the model parameters are identifiable if one of the resistance, reactance and the ratio of them is known. The conclusion is validated through a simulation example. A strategy for parameter identification of...
In order to consider the effect of the distribution network on the load modeling, a synthesis load model (SLM) including the power load and the distribution network has been proposed. Using SLM, the accuracy of the load modeling can be improved. At the same time, a strategy of the parameter estimation of the SLM is proposed in this paper. The proposed parameter estimation strategy is based on the...
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