Regional power distribution network power transformation capacity demand assessment method and system

Abstract

The invention discloses a method and a system for evaluating the power transformation capacity requirement of a regional power distribution network. The method comprises the following steps: acquiringoperation data of the regional power distribution network; Establishing a power distribution network power balance model according to the operation data, and taking 110kV and 35kV of the power distribution network as a unified voltage level to carry out power balance; Determining the power consumption load of the whole society of the target year, and obtaining the power supply load of the targetyear according to the power consumption load of the whole society of the target year and the load parameters of the power distribution network power balance model; Obtaining a target annual power transformation capacity demand of the power distribution network according to the network supply load; And obtaining a power distribution network target annual power transformation capacity newly added demand according to the power distribution network target annual power transformation capacity demand. The system comprises an acquisition unit, a modeling unit, a first operation unit, a second operation unit and a third operation unit which are in communication connection in sequence, and the system is used for realizing the method.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method and system for evaluating variable capacity demand of a regional distribution network. Background technique [0002] The grid supply load is the load supplied by the grid company (main grid), that is, the part of the user's installed load that may be supplied by the power supply company. The supply and load forecast of the voltage dividing network is the basis of the power balance calculation and an important condition for determining the variable capacity of each voltage level. [0003] The capacity-to-load ratio is the ratio of the total capacity (kVA) of substation equipment in a certain power supply area to the corresponding total load (kW). The capacity-to-load ratio is an important macro-control indicator to ensure that the load can be transferred smoothly when the power grid fails. The combination of a reasonable capacity-to-load ratio and an appropriate grid struc...

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Problems solved by technology

[0006] 1) For the power grid at this level, the "direct supply" load access voltage level is the same as that of the power grid at the same level, and the power grid at the upper level is the main power supply source, but the power grid at this level can provide a certain capacity as the user's backup (emergency) power supply; " The “direct drop” load access voltage level is lower than that of the power grid at the same level, and the power grid at the upper level and the power grid at the same level can form a dual power supply relationship, and the power supply range cannot be completely distinguished

Therefore, the current method of fully deducting the direct supply (reduced) load of the upper-level power grid for the grid supply load of the current level does not fully conform to the actual situation.

[0007] 2) In areas where the degree of integration of 110kV and 35kV power grids is high, there is no clear boundary for the power supply range of 10kV public lines, resulting in P 直降1 and P 直降2 It is difficult to estimate accurately, and it is not reasonable and necessary to use 35kV as an independent voltage level for power balance

[0008] 3) When the scale of the power grid is large, the absolute value of the reserve capacity planned and designed according to the capacity-load ratio will be very large, which may exceed the actual reserve demand

[0009] 4) The influence of relevant policy factors such as the liberalization of incremental business of the modern distribution network, large-scale new energy access, charging piles and other controllable loads and the construction of grid-connected micro-grids on the network supply load and distribution network planning and construction are not fully considered. influences

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