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There has been a significant rise in photovoltaic (PV) system installations throughout the last decade. This has posed some technical challenges to the distribution grid operators. Unfamiliar impacts of these relatively new energy sources now should be handled more comprehensively. The rigidity of these impacts mostly depends on PV penetration level, grid and weather characteristics as well as the...
In this paper, to further improve the performance of dynamic and anti-interference of the permanent magnet synchronous motor (PMSM) control system, the grey control strategy of predictive current for PMSM is proposed by analyzing the characteristics of the actual current response in control system and making full use of historical current data to adjust the current value quickly to follow the change...
The study of wind power system strongly relies on simulations in all kinds of methods. In industry, the feasibility and efficiency of wind power projects also will be verified by simulations at first. However, taking time cost and economy into consideration, simulations in large scales often sacrifice model details or computing precision in order to gain acceptable results in higher simulating speed...
This paper presents a communication-less distributed voltage control strategy for a multi-bus AC islanded microgrid. First, a Kalman Filter-based network voltage estimator is proposed to obtain voltage responses without communication links in the presence of load disturbances. Then, a voltage optimal controller using MPC (Model Predictive Control) are developed to implement voltage optimal control...
Electric arc furnace (EAF) and other non-linear impact load are equivalent to the pollution source for power quality of grid, which will cause the device in grid to be heated and vibrated, that will increase loss, condense the life of the device and even damage it, interfere with communication, cause the relay protection to misoperate, and cause flick that will have the eyes more tired. In this paper,...
Islanding operation of distribution systems with distributed generations (DG) is becoming a viable option for economical and technical reasons. However, there are various issues to be resolved before it can be a reality. One of the main issues is control of the DG. Control strategies, that may work fine while a DG is connected to a grid, might not work as desired while it is islanded and vise versa...
Danish distribution systems are characterized by a significant penetration of small gas turbine generators (GTGs) and fixed speed wind turbine generators (WTGs). Island operation of these distribution systems are becoming a viable option for economical and technical reasons. However, stabilizing frequency in an islanded system is one of the major challenges. This paper presents three different gas...
This paper presents a daily load response model based on the day ahead spot market prices. It can simulate an optimal expense saving on electricity based on the assumption that the total consumption is not changed. A mathematic formulation is described for the load reduction in potential hours by judging whether the actual price is higher than a certain response price. The model computation can be...
This paper compares in a load flow calculation three existing steady-state models of static VAr compensator (SVC), i.e. the generator-fixed susceptance model, the total susceptance model and the firing angle model. The comparison is made in terms of the voltage at the SVC regulated bus, equivalent SVC susceptance at the fundamental frequency and the load flow convergence rate when SVC is operating...
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