Staged voltage control method and system for alternating current and direct current system under high wind power permeability

A voltage control method, technology of AC and DC systems, applied in the direction of AC network voltage adjustment, wind power generation, electrical components, etc., can solve the problem of less research on long-term voltage control of AC and DC grids, no consideration of system reactive power backup optimization, and reduction of long-term system Voltage stability and other issues, to achieve the effect of increasing the backup margin, coordinating and optimizing the AC and DC control amount, and improving long-term voltage stability

Active Publication Date: 2021-08-13
SHANDONG UNIV
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the knowledge of the inventors, the following problems exist in the current distributed voltage control method of AC and DC systems under high wind power penetration rate: (1) At present, in order to deal with the uncertainty of renewable energy output, the main research is on the internal voltage regulation of wind farms and the voltage fed into the grid Control and reactive power optimization, but there are few studies on long-term voltage control of AC and DC grids under high wind power penetration
(2) Existing research only considers the emergency voltage control after the fault, and does not consider the optimization of the reactive power backup of the system after the voltage enters the safe range
After emergency voltage control, the fast response reactive power reserve drops significantly. If no reactive power replacement is performed, the system will not have sufficient fast response reactive power reserve in the next control, which will reduce the voltage stability of the system.
(3) In the existing long-term voltage instability control scheme, for the scenario where the wind farm is connected to the AC grid through VSC-MTDC, the control characteristics of flexible DC cannot be fully utilized, which reduces the long-term voltage stability of the system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Staged voltage control method and system for alternating current and direct current system under high wind power permeability
  • Staged voltage control method and system for alternating current and direct current system under high wind power permeability
  • Staged voltage control method and system for alternating current and direct current system under high wind power permeability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Such as figure 1 As shown, the voltage control method of AC and DC systems in stages under high wind power penetration rate includes the following steps:

[0059] Step 1: Obtain wind power forecast output and grid real-time operating status information, and perform partitioning based on voltage sensitivity according to the obtained information;

[0060] Step 2: Obtain the voltage information of all nodes in each area, and judge whether the maximum deviation between the voltage and the set value is greater than ΔV emer , if greater, the system enters the emergency control mode, if not greater, enter step 4;

[0061] Step 3: Determine whether the reactive power and flexible DC control quantities in the area can meet the voltage control requirements. If possible, implement emergency voltage control in the area. If not, then add the reactive control variable with the highest inter-system voltage sensitivity to the control sequence to carry out inter-regional voltage coor...

Embodiment 2

[0166] This embodiment provides a two-stage voltage control system for AC and DC systems under high wind power penetration, including:

[0167] The zoning module is configured to: use the wind power forecast output data and take the wind power access point as the cluster center to perform zoning based on voltage sensitivity;

[0168] The stage-by-stage voltage control module is configured to: acquire the lowest and highest node voltage information in each area, and perform stage-by-stage voltage control, including: emergency control stage, adopt emergency control mode, preventive voltage control stage, adopt preventive voltage control mode ;

[0169] In the emergency control stage, the control determines the next voltage control amount in the region through prediction and inter-regional communication; then the model predictive control with the minimum voltage deviation and control cost as the objective function performs voltage control; Generator sets and parallel capacitors ...

Embodiment 3

[0176] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps in the control method in the first embodiment above are realized.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the field of intelligent power grids, and provides a staged voltage control method and system for an alternating current and direct current system under high wind power permeability. In an emergency control stage, the voltage control variable of an area in the next step is determined through prediction and inter-area communication; and voltage control is carried out through model predictive control with minimum voltage deviation and control cost as objective functions. In a preventive voltage control stage, reactive replacement is performed on quick response equipment by using a generator set and a parallel capacitor in the area, so that the standby margin of the quick response equipment is increased, and the ability of the system to deal with sudden accidents is improved. A simulation result shows that the strategy can improve the calculation efficiency of long-term voltage control and optimize the reactive standby of the system.

Description

technical field [0001] The invention belongs to the field of smart grids, and in particular relates to a method and system for phase-by-stage voltage control of AC and DC systems under high wind power penetration rates. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] With the construction and operation of large-scale offshore wind farms in my country, how to reasonably accept offshore wind power has become one of the urgent problems to be solved in the power system. The connection mode between the wind farm and the AC system is an important factor affecting the stability of the AC voltage. The existing connection methods are divided into AC access, traditional DC (LCC-HVDC) access and multi-terminal flexible DC access (VSC-MTDC). VSC-MTDC has become the best choice for the existing wind power grid because of its advantages such as indepe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/16H02J3/38G06K9/62
CPCH02J3/24H02J3/16H02J3/38H02J2203/10H02J2300/28G06F18/23Y02E10/76Y02E40/30
Inventor 张文弓帅李伟佳
Owner SHANDONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap