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Primary power grid frequency modulation and power distribution platform area imbalance management method, device and system

A technology for distribution station area and grid voltage, which is applied in the direction of single-network parallel feeding arrangement, multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, etc., which can solve the temperature rise of distribution transformers, endanger Service life, power conversion efficiency decline and other issues

Active Publication Date: 2019-11-12
NARI TECH CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main hazards caused by unbalanced three-phase loads are: 1) The unbalanced three-phase current seriously affects the quality of load power supply; 2) The unbalanced current increases the temperature of the distribution transformer and endangers its service life; 3) The unbalanced three-phase current Reduce the output of distribution transformers and reduce the efficiency of power conversion

Method used

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  • Primary power grid frequency modulation and power distribution platform area imbalance management method, device and system
  • Primary power grid frequency modulation and power distribution platform area imbalance management method, device and system
  • Primary power grid frequency modulation and power distribution platform area imbalance management method, device and system

Examples

Experimental program
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Effect test

Embodiment 1

[0101] An embodiment of the present invention provides a power grid primary frequency regulation method, including:

[0102] (1) Obtain the positive sequence grid voltage frequency;

[0103] In a specific implementation manner of an embodiment of the present invention, the positive-sequence power grid voltage frequency is obtained through the following steps:

[0104] Get grid voltage u gABC , and perform positive and negative sequence separation calculations to obtain the corresponding grid voltage positive and negative sequence components u gABC+ / u gABC- ;

[0105] The positive and negative sequence components u of the grid voltage gABC+ / u gABC- Send it to the phase-locked / frequency module to obtain the positive and negative sequence grid voltage phase θ g+ / θ g- and positive sequence grid voltage frequency f g+ ;

[0106] (2) Obtaining a positive-sequence active current command according to the voltage frequency of the positive-sequence power grid;

[0107] In a...

Embodiment 2

[0115] An embodiment of the present invention provides a method for managing the unbalance between the power grid and the distribution station area. The distribution station area refers to the power supply range or area of ​​(one) transformer, including:

[0116](1) PI control is performed on the obtained negative-sequence load current and the negative-sequence inductance current of the inductance at the inverter output end connected to the power grid to generate a negative-sequence current modulation signal;

[0117] In a specific implementation of the embodiment of the present invention, the negative sequence load current is obtained through the following steps:

[0118] Get the load current i oABC , based on the load current i oABC Perform positive and negative sequence separation calculations to obtain the corresponding load current positive and negative sequence components i oABC+ / i oABC- ;

[0119] The negative-sequence inductor current and positive-sequence inducto...

Embodiment 3

[0154] Based on the same inventive concept as Embodiment 1, a power grid primary frequency regulation device is provided in the embodiment of the present invention, including:

[0155] a first acquisition module, used to acquire the voltage and frequency of the positive-sequence power grid;

[0156] a first calculation module, configured to obtain a positive-sequence active current command according to the voltage and frequency of the positive-sequence power grid;

[0157] The first modulation module is configured to perform modulation processing on the positive sequence active current command to generate a control signal for controlling the power switch of the inverter connected to the grid.

[0158] The rest are the same as in Example 1.

[0159] In a specific implementation of the embodiment of the present invention, the calculation formula of the positive sequence active current command is:

[0160] i Ldref+ =[f n -f g+ ]·D p

[0161] where f n is the rated grid fr...

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Abstract

The invention discloses a primary power grid frequency modulation and power distribution platform area imbalance management method, a device and a system. The method comprises the steps of obtaining positive-sequence power grid voltage frequency, obtaining a positive-sequence active current instruction according to the positive-sequence power grid voltage frequency, and modulating the positive-sequence active current instruction to generate a control signal for controlling an inverter power switch connected with a power grid. According to the method, voltage information of a power grid side isacquired in real time; corresponding frequency information is calculated; the positive-sequence active current instruction is obtained based on a set calculation formula of the positive-sequence active current instruction; the control signal for controlling the inverter power switch connected with the power grid is finally generated; and an inverter is controlled to participate in primary frequency modulation of the power grid. In addition, load current information of a user side is acquired; negative-sequence current compensation is performed; a three-phase symmetry degree of incoming grid current is improved; and imbalance management of a power distribution platform area is realized.

Description

technical field [0001] The invention belongs to the technical field of power grid regulation, and in particular relates to a method, device and system for primary frequency regulation of a power grid and unbalanced control of power distribution station area. Background technique [0002] There are many power users in the low-voltage distribution station area in my country and the distribution is scattered, and there are a large number of single-phase loads with unbalanced spatial and temporal distribution, which leads to the problem of three-phase load imbalance of varying degrees in most distribution station areas. The main hazards caused by the unbalanced three-phase load are: 1) The unbalanced three-phase current seriously affects the quality of the load power supply; 2) The unbalanced current increases the temperature of the distribution transformer and endangers its service life; 3) The unbalanced three-phase current The output of the distribution transformer is reduced...

Claims

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Application Information

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IPC IPC(8): H02J3/48H02J3/26
CPCH02J3/48H02J3/26Y02E40/50
Inventor 姬秋华韦徵王彤阙波陈超
Owner NARI TECH CO LTD
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