Method for determining allowed capacity of distribution network distributed power supply

A technology of distributed power and access capacity, applied in photovoltaic power generation, wind power generation, electrical components, etc., can solve the influence of protection equipment malfunction or refusal to operate, power quality, power flow and network loss of distributed power distribution network Large differences, distribution network design, operation, maintenance impact, etc.

Inactive Publication Date: 2017-01-18
山东省建设项目环境评审服务中心
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the access of a large number of distributed power sources in the distribution network, it will have a certain impact on the design, operation and maintenance of the distribution network.
However, different positions and capacities of distributed power sources have differe

Method used

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  • Method for determining allowed capacity of distribution network distributed power supply
  • Method for determining allowed capacity of distribution network distributed power supply
  • Method for determining allowed capacity of distribution network distributed power supply

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Embodiment Construction

[0038] The present invention is described in detail below in conjunction with accompanying drawing:

[0039] A method for determining the access capacity of distributed power sources in a distribution network, specifically including the following steps:

[0040] Step 1: Transform the equivalent model of the distributed power fan and photovoltaic equipment to be connected under steady-state conditions:

[0041] (1) The stator winding of the squirrel-cage induction generator is directly connected to the grid. The active power P absorbed by the fan to the grid and the reactive power Q output are:

[0042] P = - U s 2 R r / s ...

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Abstract

The invention discloses a method for determining the allowed capacity of a distribution network distributed power supply. The method comprises a step of carrying out the conversion of an equivalent model on the fan of a distributed power supply to be accessed and photovoltaic equipment under a steady-state condition, a step of determining the maximum allowed capacity of a system distributed power supply through a distributed network current balance equation and a steady-state safety constraint condition with the maximum allowed capacity of the system distributed power supply as an objective function, a step of checking protection equipment characteristics on the determined maximum allowed capacity of the system distributed power supply, and viewing the determined maximum allowed capacity as a maximum allowed capacity accepted by a system if a characteristic of not damaging initial protection equipment is satisfied, and correcting the capacity of the distributed power supply until the characteristic of not damaging initial protection equipment is satisfied if the characteristic of not damaging initial protection equipment is not satisfied. The method has the advantages that the maximum allowed capacity of the distributed power supply of the distribution network in a steady state can be comprehensively and accurately calculated, and the guide of the planning of the distributed power supply in the distribution network is facilitated.

Description

technical field [0001] The invention belongs to the technical field of distributed power sources in distribution networks, and in particular relates to a method for determining the access capacity of distributed power sources in distribution networks. Background technique [0002] With the access of a large number of distributed power sources in the distribution network, it will have a certain impact on the design, operation and maintenance of the distribution network. However, different positions and capacities of distributed power sources have different influences on power quality, power flow and network loss of distribution network. At the same time, the introduced distributed power supply may also affect the current measurement of the line relay protection, thus causing malfunction or refusal of the protection equipment. [0003] When introducing distributed power sources, it is necessary to consider the capacity of the distribution network for the capacity of distribut...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/46G06Q50/06
CPCG06Q50/06H02J3/383H02J3/386H02J3/46Y02E10/56Y02E10/76
Inventor 王勃
Owner 山东省建设项目环境评审服务中心
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