Hierarchical coordination voltage control method and system for hybrid multi-infeed AC/DC hybrid system

A voltage control method, AC-DC hybrid technology, applied in the direction of AC network voltage adjustment, AC network circuit, power transmission AC network, etc., can solve the non-optimal control of arc-extinguishing angle system voltage and fail to fully utilize the DC control characteristics , lack of coordinated control of AC and DC systems, etc., to achieve the effect of improving medium and long-term voltage stability, improving long-term voltage stability, and increasing controllable margin

Active Publication Date: 2020-09-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This move is not necessarily suitable for medium and long-term voltage problems. Keeping the arc extinguishing angle unchanged ensures the success of conventional DC commutation, but it does not control the entire system voltage optimally.
(2) In the existing

Method used

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  • Hierarchical coordination voltage control method and system for hybrid multi-infeed AC/DC hybrid system
  • Hierarchical coordination voltage control method and system for hybrid multi-infeed AC/DC hybrid system
  • Hierarchical coordination voltage control method and system for hybrid multi-infeed AC/DC hybrid system

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Embodiment 1

[0042] like figure 1 and figure 2 As shown, the hierarchical coordinated voltage control method of hybrid multi-infeed AC / DC hybrid system includes the following steps:

[0043] Step 1: Calculate the trajectory sensitivity of each bus voltage and the voltage sensitivity of each control variable to the DC infeed bus based on the initial value information of the hybrid multi-infeed AC-DC hybrid system, the DC infeed bus and the DC system, combined with time domain simulation ;

[0044]Step 2: According to the corresponding relationship between the system-level and converter-station-level control activation conditions and the trajectory sensitivity of each busbar voltage and the voltage sensitivity of the DC feed-in busbar, determine whether to activate the system-level control and the converter station-level control;

[0045] Step 3: Calculate the generator reactive power margin based on the wide-area measurement data and determine whether the system-level participating coord...

Embodiment 2

[0114] This embodiment provides a hierarchical coordinated voltage control system for a hybrid multi-infeed AC / DC hybrid system, including:

[0115] (1) Sensitivity calculation module, which is used to: calculate the trajectory sensitivity and control variables of each bus voltage based on the initial value information of the hybrid multi-infeed AC-DC hybrid system, the DC infeed bus and the DC system, combined with time domain simulation Voltage sensitivity to DC feed-in bus;

[0116] Specifically, in the sensitivity calculation module, the initial value information of the hybrid multi-infeed AC-DC hybrid system, the DC infeed bus and the DC system is calculated based on the wide-area measurement data.

[0117] (2) Control start judgment module, which is used to judge whether to start the system level and converter station level control start conditions according to the corresponding relationship between the trajectory sensitivity of each bus voltage and the voltage sensitivi...

Embodiment 3

[0128]This embodiment provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps in the method for hierarchically coordinated voltage control of a hybrid multi-infeed AC / DC hybrid system as described above are implemented .

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Abstract

The invention provides a hierarchical coordination voltage control method and system for a hybrid multi-infeed AC/DC hybrid system. The method comprises the following steps: 1, calculating the track sensitivity of each bus voltage and the voltage sensitivity of each control quantity to a direct-current feed-in bus; 2, judging whether system-level control and converter station-level control are started or not; 3, calculating the reactive power margin of the generator based on the wide-area measurement data, and determining whether the system-level participation coordination control quantity comprises a converter station-level control quantity or not; 4, optimizing and solving a corresponding optimal control sequence of voltage stability coordination control; 5, judging whether the control quantities in the two-stage optimal control sequences of the system and the converter station conflict or not, if yes, selecting the control quantities according to a coordination control rule for application, detecting whether the load bus voltage meets a preset requirement or not after application, and if yes, exiting coordination control; otherwise, repeating the steps 1-5 until the voltage of the load bus meets the preset requirement. And the medium-and-long-term voltage stability of the system can be improved.

Description

technical field [0001] The invention belongs to the field of smart grids, and in particular relates to a method and system for hierarchically coordinated voltage control of a hybrid multi-infeed AC / DC hybrid system. 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] Due to the reverse distribution of energy centers and loads in my country, conventional direct current has been fully developed due to its advantages of long-distance and large-capacity power transmission. Flexible DC has the characteristics of decoupling regulation of active and reactive power, and no risk of commutation failure. It is suitable for new energy grid connection and interconnection of regional power grids, and has been developed rapidly. With the increase of high-voltage DC lines, flexible DC (VSC-HVDC) and conventional DC (LCC-HVDC) are fed into the same AC busbar ...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/38H02J3/12
CPCH02J3/12H02J3/36H02J3/38H02J2203/20Y02E60/60
Inventor 张文弓帅
Owner SHANDONG UNIV
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