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Power distribution network power flow dynamic equivalence method and system integrating distributed power sources and loads

A distributed power supply and dynamic equivalent technology, applied in the field of value, can solve the problems of inability to accurately simulate distributed power supply and load flow results and dynamic response

Active Publication Date: 2020-12-04
STATE GRID ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In existing research and patents, the distribution network equivalent with distributed power sources and loads generally only considers the power offset effect of the two, while ignoring the actual power magnitude and direction of the two in the distribution network equivalent. As a result, in the grid power flow and subsequent stability analysis, it is impossible to accurately simulate the power flow results and dynamic responses of distributed power sources and loads

Method used

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  • Power distribution network power flow dynamic equivalence method and system integrating distributed power sources and loads
  • Power distribution network power flow dynamic equivalence method and system integrating distributed power sources and loads
  • Power distribution network power flow dynamic equivalence method and system integrating distributed power sources and loads

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Embodiment 1

[0054] Embodiment 1: as figure 1 As shown, the present invention proposes a dynamic equivalence method of distribution network power flow that integrates distributed power sources and loads, including the following content:

[0055] figure 1 In step 1, the description is to divide the research period T into K time sections, and obtain each time section T k Corresponding system power flow data before equivalence, k∈K. Power flow data include active power and reactive power of distributed power sources and loads in the study area, bus voltage amplitude and phase angle; network parameters include lines, transformer impedance, admittance, etc.

[0056] figure 1 The description in step 2 is for the time section T k , to calculate the apparent power loss of each branch under the independent action of distributed power sources and loads in the study area at this moment k. Specifically, it is divided into the following five steps:

[0057] The first step is to standardize the ne...

Embodiment 2

[0072] Embodiment 2: The present invention also proposes the distribution network power flow dynamic equivalent system of integrated distributed power supply and load, including:

[0073] The power flow data generation module is used to: divide the research period T into K time sections, and obtain each time section T k Corresponding system power flow data before equivalence, k∈K;

[0074] The apparent power loss generation module is used for: for the time section T k , to calculate the apparent power loss of each branch under the independent action of distributed power sources and loads in the research area at this moment k;

[0075] The integrated equivalent impedance calculation module is used to: calculate the integrated equivalent impedance Z according to the principle that the apparent power loss before and after the equivalent is equal, and comprehensively consider the interactive influence of the distributed power supply and the load k eqcom ;

[0076] The dynamic ...

Embodiment 3

[0079] Embodiment 3: The apparent power loss generating module specifically includes:

[0080] Scale the network parameters of the distribution network in the research area, the network parameters include lines and transformers; reduce the transformer parameters to the high-voltage side, and merge them into the branch parameters of the high-voltage side; at this time, set the total J of the distribution network branch, the impedance of the jth branch is Z j , j ∈ J;

[0081] Disconnect all the load branches in the research area, and calculate the apparent power S of the branch j under the action of the distributed power source E alone at the time section k j ke , assuming that the current direction of branch j is positive at this time, the current of branch j is Voltage is

[0082] To calculate the apparent power loss of branch j at this time, use the following formula to calculate:

[0083]

[0084] Disconnect all distributed power branches in the research area, and ...

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Abstract

The invention discloses a power distribution network power flow dynamic equivalence method and system integrating a distributed power supply and a load. The method comprises the following steps: dividing a research time period T into K time sections, and obtaining system power flow data before equivalence corresponding to each time section Tk; for the time section Tk, respectively solving apparentpower loss of each branch under the independent action of a distributed power supply and a load in a research area at the moment k; comprehensively considering the interaction influence of the distributed power supply and the load, and calculating the comprehensive equivalent impedance Zkeqcom; considering the dynamic change of the operation mode in the research time period T, weighting the comprehensive equivalent impedance Zkeqcom corresponding to each time section Tk to obtain an average value, and obtaining the power distribution network dynamic equivalent impedance Zeqdyn of the comprehensive distributed power supply and the load in the T time period; and removing an original research area power distribution network in the simulation data, replacing the original research area power distribution network with a distributed power supply and a load in the original research area, respectively summing, and accessing an equivalent point through a dynamic equivalent impedance Zeqdyn. According to the invention, the order and complexity of load flow calculation are reduced.

Description

technical field [0001] The invention relates to a dynamic equivalence method and system of distribution network power flow for integrated distributed power sources and loads, and belongs to the technical field of power systems and automation thereof. Background technique [0002] Distributed power generation refers to the construction and installation at or near the user's site, the operation mode is mainly for the user's self-use, the surplus power is connected to the grid, and the power generation facility or the energy comprehensive cascade with power output is characterized by the balance adjustment of the distribution network system Utilize multi-generation facilities; access to the distribution network for operation, small and medium-sized power generation facilities that consume power generation nearby, and comprehensive energy utilization systems with power output. Distributed power generation generally has the following characteristics: first, it is adapted to local...

Claims

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 吕亚洲杨铖李兆伟汤伟刘福锁吴迪李威贺静波金一丁张倩
Owner STATE GRID ELECTRIC POWER RES INST
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