基于功能单元的高压配电网负荷转供分层优化模型

发布时间：2018-08-12 20:41

【摘要】：本文提出一种基于功能单元的高压配电网负荷转供分层优化模型以疏缓愈来愈复杂的城市电网阻塞,即将城市电网抽象为上层220 kV供电通道和下层110 kV功能单元组的简化模型。上层模型中,通过功能单元可达性矩阵定义"通道分配因子"引导单元组内负载在各供电通道的分配,定义"容载协调比例"协调"容""载"间的不平衡关系,并将二者作为粒子编码,利用算法初始化通道分配因子及容载协调比例,生成网络负载预分布;下层模型中,事先枚举"有效供电路径矩阵"反映单元组内负载的实际分布,定义贴近度反映单元组内负载的实际分配与通道分配因子的贴近程度,根据上层模型生成的通道分配因子及容载协调比例,引导下层各变电单元组的实际负载及协调量向上层贴近。将上下层目标函数之和作为粒子群算法的适应度函数,即可形成上层全网有功负载预分布引导,下层功能单元组交互执行的求解策略,使负载分布逐渐趋于合理的均衡状态,并在潮流校验的前提下利用算法的迭代更新使系统负载分布逐渐趋于均衡。以离散二进制编码代表每一种操作序列,采用模糊综合评价方法评估网络从初态到终态不同过渡方案下系统的安全水平,在优化方案确定后,制定一个在连续操作下安全水平较优的操作序列,以保证每一步操作都能使电网运行在控制阈值范围内。利用某城市电网局部系统验证了方法的有效性与在线分析的适用性。
[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.
【作者单位】：四川大学电气信息学院;国网成都供电公司;
【基金】：国家高技术研究发展计划资助项目(2014AA051901)
【分类号】：TM732

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