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适应季节性负荷的配电变压器与台区线路协调规划方法

花匠小妙招
2024-12-21 18:19

摘要: 为改善农村煤改电地区设备利用效率低的问题，并兼顾供电可靠性，提出一种适应季节性负荷的配电变压器与台区线路优化规划方法。主要思路是建立配变间低压联络线，根据季节性负荷特点，通过联络线开关状态变化，转换运行方式，使部分配变低负荷季节退出运行。以综合费用最小为目标构建配电变压器网络双层规划模型，上层采用Voronoi法规划配电变压器，下层采用Prim算法规划低压供电线路，并结合遗传算法进行优化求解。最后，通过对典型供电区域进行配变规划验证了该方法的可行性，并且能够降低配变损耗，提高供电的可靠性和经济性。

Abstract: Taking into account power supply reliability, this paper proposed an optimal planning method adapting to seasonal load for distribution transformer network in order to improve equipment utilization efficiency in rural coal-to-electricity conversion areas. The main idea was firstly to establish low-voltage tie-line between distribution transformers, and according to seasonal load characteristics, some distribution transformers could withdraw from operation in low-load season by switching the tie-line operation state and mode. In this method, a bi-level programming model of distribution transformer network was constructed to minimize the overall cost. Voronoi method was used to plan the distribution transformer at the upper level; Prim algorithm was used to plan the low-voltage power supply line at the lower level, and genetic algorithm was used to seek the optimal solution. Finally, the feasibility of the method was verified by the distribution planning of typical power supply areas, and it can reduce the distribution transformer loss and improve the reliability and economy of power supply.

图 1 配电变压器网络优化规划流程图

Figure 1. Flowchart of distribution transformer network planning optimization

图 2 某D类配电变压器网络优化规划方案图

Figure 2. Optimal planning of a class D distribution transformer network

图 3 某D类配电变压器网络冬季运行图

Figure 3. Winter operational diagram of a class D distribution transformer network

图 4 某D类配电变压器网络春夏秋季运行图

Figure 4. Spring, summer and autumn operational diagram of a class D distribution transformer network

表 1 配电变压器网络规划方案表

Table 1 Distribution Transformer Network Planning Schemes

编号 1 2 3 4 5 各项费用/万元容量/kVA 315 400 400 315 200 29.388 横坐标 114 224 343 338 322 — 纵坐标 212 319 177 400 130 春夏秋季是否运行否否是否否 — 低压线路长度/m(个数/条) 190.9(4) 173(5) 339.8(5) 120(3) 140.8(2) 32.406 联络线长度/m (个数/条) — — 691(4) — — 1.733 总费用 — — — — — 63.527

表 2 冬季配电变压器运行情况参数表

Table 2 Parameters of distribution transformer operation in winter

编号容量/kVA 负荷/kW 运行效率/% 空载损耗/W 负载损耗/W 1 315 162.324 69.68 480 1 243.82 2 400 228.456 77.23 560 2 119.36 3 200 108.216 73.16 340 928.95 4 315 156.312 67.10 480 1 358.02 5 400 192.384 65.03 560 1 502.92

表 3 春夏秋季配电变压器运行情况参数表

Table 3 Parameters of distribution transformer operation in spring, summer and Autumn

编号容量/kVA 负荷/kW 运行效率/% 空载损耗/W 负载损耗/W 3 200 96.162 66.12 340 758.554

表 4 方案建设费用明细对比表

Table 4 Detailed comparisons of construction costs between different schemes

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