基于功能單元的高壓配電網(wǎng)負(fù)荷轉(zhuǎn)供分層優(yōu)化模型
[Abstract]:In this paper, a hierarchical optimization model of load transfer for high voltage distribution network based on function unit is proposed to reduce the congestion of urban power network to a simplified model of 220kV power supply channel in upper layer and 110 kV function unit group in lower layer. In the upper layer model, the distribution of load in each power supply channel is defined by the reachability matrix of function unit, and the unbalanced relationship between "load coordination proportion" and "coordination capacity" is defined. Using the algorithm to initialize the channel allocation factor and load coordination ratio, the network load predistribution is generated. In the lower layer model, the effective power supply path matrix is enumerated in advance to reflect the actual distribution of the load in the unit group. The definition of closeness degree reflects the actual distribution of load and the close degree of channel distribution factor in the unit group, and according to the channel allocation factor and load tolerance coordination ratio generated by the upper layer model, Guide the actual load and coordination of each subunit group to the upper layer. If the sum of objective function of upper and lower layers is taken as the fitness function of particle swarm optimization algorithm, a solution strategy of active load predistribution in upper layer and interactive execution of functional unit group in lower layer can be formed, which makes the load distribution gradually tend to a reasonable equilibrium state. Under the premise of power flow check, the system load distribution is gradually balanced by iterative updating of the algorithm. Each operation sequence is represented by discrete binary code, and the fuzzy comprehensive evaluation method is used to evaluate the security level of the system under different transition schemes from initial to final states. A sequence of operations with better safety level under continuous operation is established to ensure that each step of operation can make the power network operate within the control threshold range. The validity of the method and the applicability of on-line analysis are verified by using a local system of a city power network.
【作者單位】: 四川大學(xué)電氣信息學(xué)院;國網(wǎng)成都供電公司;
【基金】:國家高技術(shù)研究發(fā)展計劃資助項目(2014AA051901)
【分類號】:TM732
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