考慮輸電能力及輸電阻塞的風電并網系統(tǒng)多區(qū)域協調調度
[Abstract]:Facing the severe situation of energy shortage and environmental deterioration, countries all over the world are actively seeking to develop renewable energy, and the advantages of wind power generation for clean economy, safe, efficient and sustainable development and utilization have been vigorously developed. The large-scale centralized grid connection of wind power makes the power system dispatching face serious challenges. A new regional coordinated dispatching method is studied from multi-space scale to effectively deal with the uncertainty factors such as wind power fluctuation, randomness and so on, so as to ensure the security and stability of power grid. It is very important in theory and engineering application to operate economically and efficiently and to improve the wind power absorption capacity of the system. In this paper, the multi-area coordinated scheduling model and method for large-scale wind power grid-connected systems considering transmission capacity and transmission congestion are studied based on the tie-line transmission restriction and electricity transaction plan in multi-space scale. In this paper, the short term Beta distribution model of large scale wind farm is analyzed, and two kinds of mathematical analysis methods including wind power uncertainty are introduced: the analytic method based on probability theory and the Monte Carlo method based on stochastic simulation. And the Latin hypercube sampling method is used to simulate the short-term wind power output. According to the chance constrained programming model with wind power uncertainty, the linear relation and convolution operation between wind power random fluctuation and line power flow are derived. According to the predetermined confidence level, the chance constraint with random variables is transformed into the corresponding deterministic equivalent penalty function and introduced into the objective function, and then the particle swarm optimization algorithm is used to solve the problem. The available transmission capacity of power systems with large scale wind farms is studied by considering the electricity transaction plan. Based on the continuous power flow method, an improved algorithm for linear prediction with key constraints is proposed. The extended power flow equation is introduced into the AC power flow model to solve the power system deterministic ATCs, and the fast sensitivity estimation model of the power system ATC to the input power fluctuation of wind power is derived. On this basis, combined with the multidimensional visual injection power space of wind power grid connection system, a hierarchical clustering algorithm is proposed to divide Monte-Carlo sampling samples, considering generator random fault, line random fault and wind speed. Probabilistic ATC fast calculation method for generator output and load fluctuation, real-time monitoring, dynamic updating of the limited transmission capacity of the contact section with safety constraints among regional power grids. Aiming at the transmission congestion problem caused by long distance, large scale and high concentration wind power development model in China, a set of reasonable multi region coordinated scheduling method is established by using optimal scheduling product retention method. The prediction probability distribution is used to represent the uncertainty brought by wind power grid connection. The tie-line power flow constraint is added to the forward constraints to determine whether there is a generation plan with no h time limit for transmission section under the most optimistic condition. If it exists, the generation plan at t time satisfies the forward constraint of transmission section; otherwise, the generation plan at t time can be adjusted by chance constraint programming theory, and the generator output between interconnected regions can be reasonably coordinated. In order to eliminate the power system transmission congestion phenomenon, maximum absorption of wind power.
【學位授予單位】:華中科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TM614;TM73
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