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Dynamic reactive power optimization method and system of AC-DC hybrid power grid

An AC-DC hybrid, AC-DC technology, applied in AC network circuits, reactive power compensation, reactive power adjustment/elimination/compensation and other directions, which can solve the problems of incomplete construction of constraints and low computational efficiency.

Inactive Publication Date: 2019-04-12
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of incomplete construction of constraint conditions and low calculation efficiency existing in the prior art, the present invention provides a dynamic reactive power optimization method and system for AC / DC hybrid power grids

Method used

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  • Dynamic reactive power optimization method and system of AC-DC hybrid power grid
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  • Dynamic reactive power optimization method and system of AC-DC hybrid power grid

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Embodiment 1

[0089] Such as figure 1 As shown, a dynamic reactive power optimization method for an AC / DC hybrid power grid provided by the present invention includes:

[0090] Step S1, collecting power grid operating parameters;

[0091] Step S2, bringing the power grid operating parameters into the pre-built and processed AC / DC dynamic reactive power optimization model for solution;

[0092] Step S3, performing reactive power control on the AC / DC hybrid grid system based on the solution result;

[0093] Wherein, the processing of the AC / DC dynamic reactive power optimization model includes performing relaxation and linearization processing on the dynamic reactive power optimization model based on second-order cone programming.

[0094] Specifically, the present invention considers the following three aspects, and provides a dynamic reactive power optimization method for an AC / DC hybrid power grid:

[0095] First, with the rapid development of clean energy such as wind and wind, double-...

Embodiment 2

[0197] In this embodiment, taking the IEEE30 node system as an example, the effectiveness of the model and algorithm built in the present invention is verified through simulation calculations.

[0198] 1. Optimization model

[0199] 1) if Figure 5 As shown in Table 1, a DC branch is added between nodes 2 and 6, and between nodes 1 and 18.

[0200] Table 1 DC branch parameters

[0201]

[0202] 2) The load data takes the load of IEEE 30 nodes as the reference value, converts the load forecast of each period into the ratio of the reference load, and can obtain the load proportional factor at time 0-24 as Figure 6 As shown, the reactive power of the load and the active power of the generator increase in the same proportion.

[0203] 3) Change the conventional unit at node 5 to a wind power plant, and the equivalent wind turbine feature points are (40MW, -20Mvar), (60MW, -10Mvar), (100MW, 0Mvar), (50MW, 5Mvar).

[0204] 4) The parameters of discrete reactive power compens...

Embodiment 3

[0231] Based on the same inventive concept, the present invention also provides a dynamic reactive power optimization system for power grid, including

[0232] The collection module is used to collect the operating parameters of the power grid;

[0233] A solving module, used to bring the grid operating parameters into a pre-built and processed AC / DC dynamic reactive power optimization model for solving;

[0234] The control module is used for reactive power control of the AC / DC hybrid grid system based on the solution result;

[0235]Wherein, the processing of the AC / DC dynamic reactive power optimization model includes performing relaxation and linearization processing on the AC / DC dynamic reactive power optimization model based on second-order cone programming.

[0236] In an embodiment, the system also includes a building block for building an AC / DC dynamic reactive power optimization model; the building block includes:

[0237] The objective function sub-module is used ...

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Abstract

The invention provides a dynamic reactive power optimization method and system of an AC-DC hybrid power grid. The dynamic reactive power optimization method comprises the steps of acquiring a runningparameter of the power grid; bringing the running parameter of the power grid to an AC-DC dynamic reactive power optimization model which is built in advance and process for solution; and performing reactive control on the AC-DC hybrid power grid system according to a solution result, wherein the processing of the AC-DC dynamic reactive power optimization model comprises the step of performing loosening and linear processing on the AC-DC dynamic reactive power optimization model according to two-step cone planning. By the dynamic reactive power optimization method, the constraint relation of each equipment is comprehensively considered, and the accuracy and the calculation rate of a calculation result is improved

Description

technical field [0001] The present invention relates to the field of dispatching control of power systems, in particular to an AC / DC hybrid power grid considering the characteristics of a voltage source converter (Vehicle Stability Control, VSC) and the reactive power support of a double-fed induction motor (Double Fed Induction Generator, DFIG) Dynamic reactive power optimization method and system. Background technique [0002] Vigorously developing new energy is the only way for all countries to ensure energy supply security, respond to climate change, control smog, and achieve sustainable development in the future. Due to the reverse distribution of new energy resources and consumption centers, UHV DC projects must be used for long-distance power transmission to realize the allocation and consumption of new energy across the country. With the commissioning of a series of UHV DC projects, the characteristics of "strong direct and weak alternating current" of the cross-reg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCH02J3/1842Y02E40/30
Inventor 范士雄韩巍刘幸蔚卫泽晨王伟沈晓东刘彦王衡张锋宋朋飞
Owner CHINA ELECTRIC POWER RES INST
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