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This paper presents Craziness Based Particle Swarm Optimization (CRPSO) technique for solving constrained optimal power flow problems in power systems, considering nonlinearities like valve point loading and prohibited operating zones of generators. In this paper, the proposed algorithm has been tested in 26-bus system under various simulated conditions and its solutions are compared to those of simple...
To reduce the impact of large output power fluctuations of a wind turbine generator (WTG) integrated in a power system, a battery energy storage system (BESS) is installed with the WTG. However, if a large battery is installed, the capital cost of the wind turbine system will increase. Hence, the smaller size of battery is preferable to reduce the capital cost and the battery should be utilized effectively...
This paper presents a new method for planning single-tuned passive harmonic filters to control harmonic voltage distortion throughout a power system. In the problem, the probabilistic characteristics of the harmonic source currents and network harmonic impedances in the filter planning are taken into account. The objective is to minimize the total filter installation cost, while the harmonic voltage...
This paper presents a novel optimization technique for determining the setting of various emergency power system controls. This will allow for the production of a comprehensive defence plan, against events such as cascading blackouts. The goal of this technique is to retrieve a new equilibrium operation point following a severe contingency. In the proposed optimization technique described in this...
Optimal load-shedding during contingency situations is one of the most important issues in planning, security, and operation of power systems. Load-shedding is necessary to prevent phenomena such as voltage collapse and line over load which may lead to cascade outages and then black-out. In this paper, a new optimal load-shedding approach is presented. One of the important specifications of this method...
Modern power systems are prone to widespread failures. With the increase in power demand, operation and planning of large interconnected power system are becoming more and more complex, so power system will become less secure. Operating environment, conventional planning and operating methods can leave power system exposed to instabilities. Voltage instability is one of the phenomena which have result...
The increasing electrical load penetration on power systems requires the development of researching on short-circuit current level for large scale power grid, and the problem of short circuit currents has become significant for the planning and operation of the power system.This paper analyses short-circuit current situation as well as the development tendency in China in detail, and proposes a new...
A sum of the cost of active power losses and reactive power generating equipment is used as the objective function of optimal reactive power planning (ORPP) problem. The theory of decomposition and coordination is employed to decompose the problem into three sub-problems according to load level. Every sub-problem is a problem of reactive power optimization, which is solved by a hybrid approach of...
Long-term demand forecasting presents the first step in planning and developing future generation, transmission and distribution facilities. One of the primary tasks of an electric utility accurately predicts load demand requirements at all times, especially for long-term. Based on the outcome of such forecasts, utilities coordinate their resources to meet the forecasted demand using a least-cost...
The particle swarm optimization (PSO) was showed to converge rapidly during the initial stages of a global search, but around global optimum, the search process will become very slow. On the other hand, genetic algorithm is very sensitive to the initial population. In fact, the random nature of the GA operators makes the algorithm sensitive to initial population. This dependence to the initial population...
Economic dispatch is of help to improve the economy and security of power systems operation. In view of power purchase costs reduction and active power losses reduction are two important economic targets of Hainan power grid company at the present stage, a mathematical model of optimal power purchase planning (OPPP) is therefore presented in this paper, whose objective is to minimize the total power...
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