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Urban power grid voltage instability judgment method and device considering comprehensive energy access

A technology for urban power grids and voltage instability, applied to circuit devices, electrical components, AC network circuits, etc., can solve problems such as not considering the comprehensive energy model, and achieve reliable judgment results and small errors

Inactive Publication Date: 2020-11-24
STATE GRID BEIJING ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defect that the existing technology does not consider the introduction of comprehensive energy models such as photovoltaics, energy storage, and gas turbines into the load model of the urban grid, and to determine the instability of the grid based on the load model of the urban grid. A method and device for judging voltage instability of urban power grid considering integrated energy access

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  • Urban power grid voltage instability judgment method and device considering comprehensive energy access
  • Urban power grid voltage instability judgment method and device considering comprehensive energy access
  • Urban power grid voltage instability judgment method and device considering comprehensive energy access

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Embodiment 1

[0046] Example 1: Figure 5 It is a method for judging voltage instability of an urban power grid considering comprehensive energy access according to a specific embodiment of the present invention, comprising the following steps:

[0047] Step (1): Establishment of generalized load model of urban power grid with integrated energy:

[0048] Photovoltaic, energy storage and gas turbines are connected to the urban power grid in parallel with the grid load, and connected to the large power grid through the system contact reactance. figure 1 is the grid equivalent model, where the power potential The contact reactance of the system is Z L , photovoltaic, energy storage, gas turbine and induction motor loads, static loads and distribution network reactive power compensation are all connected to the When modeling photovoltaics, energy storage and gas turbines (that is, gas generators) on the bus, they can be equivalent to negative loads, and their P-U and Q-U external character...

specific Embodiment

[0142] Figure 7 It is a block diagram of an urban power grid voltage instability judging device considering comprehensive energy access according to a specific embodiment of the present invention; Figure 7 The device for judging voltage instability of urban power grid considering comprehensive energy access is shown, including:

[0143] The generalized load equivalent model establishment module is used to establish the generalized load equivalent model of the urban power grid system. The generalized load equivalent model is based on photovoltaics, energy storage devices, gas generators and induction motors connected to the urban power grid and connected in parallel with the grid load , ZIP static load and distribution network reactive power compensation, the photovoltaic, energy storage, gas turbine and induction motor load, static load and distribution network reactive power compensation are all connected in parallel to the busbar, and the terminal voltage is And connecte...

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Abstract

The invention discloses an urban power grid voltage instability judgment method and device considering comprehensive energy access. Existing related researches mainly focus on transient voltage stability of a comprehensive load model containing an induction motor and modeling and simulation analysis of a power grid containing distributed energy, but researches on transient voltage stability characteristics of an urban load center containing comprehensive energy are relatively few. Aiming at an urban power grid containing photovoltaic, energy storage, gas turbine, induction motor and static load, a generalized load model containing comprehensive energy is established, the slip frequency of an unstable balance point of the induction motor is resolved, and the transient voltage instability state of the urban power grid is determined according to the resolved slip frequency of the unstable balance point of the induction motor.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and mainly relates to a method and a device for judging voltage instability of a city grid considering comprehensive energy access. Background technique [0002] With the continuous maturity of distributed energy, energy storage and other technologies, integrated energy access has gradually become an important solution to the electricity demand of large load centers such as urban power grids. The access of integrated energy has changed the voltage stability characteristics of urban load centers. It is very important to strengthen the research on the voltage stability of the urban power grid with integrated energy. The dynamic characteristics of the grid load have a great influence on the transient voltage stability of the power system. As a typical dynamic load, the unstable slip of the induction motor load can represent the transient voltage stability of the grid. If the slip of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 张再驰王卫杨俊炜王海云宋方方陈茜张志坚张雨璇董楠杨莉萍李大志王腾飞张文朝
Owner STATE GRID BEIJING ELECTRIC POWER
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