Study On The Daily Generation Strategy Considering Load Margin And Market Transaction

Compared the electric power industry after the marketization reform with thetraditional power industry, it is more open and competitive, and it can reduce costs,improve productivity. At the same time, it makes the generation companies grasp theinitiative of the power generation. Since then, whether the Power suppliers investment andpower generation or not, how much power to be generated no longer only depends on theneeds of security and stability of the whole power system. It will pay more attention totheirs profit maximization problem. Because of the change of the motivation for powerplants results in power system running on overload condition. In the long run, it will be aserious threat to the security and stability of the power system. However, ignoring thereturn on investment of generators, only considering the security and stability of the powersystem, it is obviously impractical. Therefore, there is an urgent demand for the powergeneration strategy model considering not only the security and stability of the powersystem, but also profit of the generator. For this, the optimal load shedding model and theway of optimal load shedding point are established in order to improve the security andstable margin of the power system operation in this thesis. And it is try to study the dailygeneration scheduling strategies considering the load margin and market transactionsin-depth. Research content and innovative achievements of the thesis mainly include thefollowing there aspects:At the first, under the market environment, this paper, the algorithm based on thecalculation the worst load increasing direction is built on saddle point bifurcation theoryand singular value decomposition theory of flow Jacobin matrix, and establishes a modelof optimal load-shedding in this thesis. It is in order to avoid the generation companiespursuiting capital profit rate and the power system running in long time under the high loadeven at the edge of extreme operation statement. It is deduced and proved applying thecorresponding theoretical of calculus, vector-space, and matrix determinant. Then, theanalysis based on the calculation and simulation of IEEE14-bus network date provescorrectness, effectiveness and practicality of the model.The secondly, in this thesis, in order to compensate the defect of the optimal loadshedding model designed almost invalid and not shedding the load under the situation insome special load, the new method of optimal load shedding point is built based onmodel of the worst load increasing direction. Using the correspondingly norm theory isproving the efficiency of this method. At the same time, using the simulation of IEEE14-bus proves the feasibility of the method. The simulation results prove the waycombining the optimal load shedding model established with the optimal load sheddingpoint method is able to provide effective guidance measures for the load shedding of thepower system operation.At the last, the model for the daily generation optimal scheduling strategies ofconsidering the load margin and market transactions is established in this thesis in order tomeet the requirements of the electricity network operation security, stability, reliability,economy. Using the model solves the difficulty of co-ordination the system operationstability and the economic benefits in the electricity market. The corresponding simpleseeking method for the requirement of real-time calculation of operation of power systemis established based on the units’ sequence on security and Quadratic Programming. At thesame time, the simulation programming and analysis with the MATLAB7.8softwareplatform are excuted based on the IEEE14-bus system. The calculating results show thatthe model is correct and the seeking method established is simple, easy, reliable andpractical.