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A Calculation Method of Inverted Type DG Access Capacity

A technology of admission capacity and calculation method, which is applied in the direction of single-net parallel feeding arrangement, etc., can solve problems such as rejection action and misoperation, and achieve the effect of ensuring selectivity and sensitivity

Inactive Publication Date: 2017-01-04
TIANJIN UNIV
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  • Description
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  • Application Information

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Problems solved by technology

The access of DG changes the fault current distribution of the distribution network and the basic conditions of the original protection configuration of the distribution network. The original three-stage current protection may malfunction or refuse to operate

Method used

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  • A Calculation Method of Inverted Type DG Access Capacity
  • A Calculation Method of Inverted Type DG Access Capacity
  • A Calculation Method of Inverted Type DG Access Capacity

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Embodiment Construction

[0017] The technical solution of the invention will be described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0018] figure 1 It is the topological diagram of 10kV distribution network system including IBDG. The IBDG is connected to the B bus on the feeder 1, the protection 1 is the upstream line protection of the IBDG, the protection 2 and the protection 3 are the downstream line protection of the IBDG, and the protection 4 and the protection 5 are the adjacent feeder protection. In the following, the short-circuit calculation model of IBDG and the approximate calculation formula of short-circuit current of distribution network including IBDG are given first, then the impact of IBDG access on the original protection of distribution network and the constraints of original protection of distribution network on IBDG capacity are analyzed, and finally This paper introduces the calculation method of IBDG access capacity un...

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Abstract

The invention relates to a method for calculating the access capacity of an inverter DG. The method firstly defines three operating states: when the voltage drop of the grid-connected point is different in the case of a fault, there are three operating states for the IBDG with low voltage ride-through capability , define these three operating states as constant power state, intermediate state, and constant current state; and IBDG is equivalent to a voltage-controlled current source. , according to the equivalent circuit diagram and the node voltage method, the expression of the relationship between the system potential and the grid-connected point voltage is obtained, and the approximate calculation formula of the short-circuit current flowing through the line is obtained by ignoring the phase angle difference between the IBDG grid-connected point voltage and the system potential ; Then calculate the IBDG admission capacity. The invention can obtain a more accurate IBDG admission capacity that can meet the protection selectivity and sensitivity requirements.

Description

[0001] Technical field [0002] The invention belongs to the field of power system distribution network protection and control, and relates to an inverter-type DG admission capacity calculation method taking into account the current protection setting principle of the distribution network. Background technique [0003] Distributed generation (DG) is a new type of electric energy, including photovoltaic power generation system, wind power generation system, micro gas turbine power generation system, small hydropower and so on. Distributed power generation technology has a series of advantages such as environmental protection and economy, and can well meet people's requirements for power safety, stability and economic environmental protection. It has attracted widespread attention and has been gradually promoted and developed. [0004] Most of the traditional medium and low voltage distribution networks are radial networks that supply power to loads in one direction. The protect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
Inventor 李永丽陈晓龙赵曼勇文安刘年魏承志黄维芳金鑫杨颖安许永军叶志锋姜超
Owner TIANJIN UNIV
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