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Hybrid multi-infeed AC/DC hybrid system hierarchical coordinated voltage control method and system

A voltage control method and a technology of a voltage control system, which are applied in the direction of AC network voltage adjustment, AC network circuit, power transmission AC network, etc., can solve the problem of non-optimal control of arc-extinguishing angle system voltage, failure to fully utilize DC control characteristics, Lack of problems such as AC and DC system coordination control, to achieve the effect of improving medium and long-term voltage stability, improving long-term voltage stability, and increasing controllable margin

Active Publication Date: 2021-11-02
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 medium and long-term voltage instability control scheme, there is a lack of coordinated control between AC and DC systems, and the control characteristics of DC cannot be fully utilized, which reduces the medium and long-term voltage stability of the system

Method used

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  • Hybrid multi-infeed AC/DC hybrid system hierarchical coordinated voltage control method and system
  • Hybrid multi-infeed AC/DC hybrid system hierarchical coordinated voltage control method and system
  • Hybrid multi-infeed AC/DC hybrid system hierarchical coordinated voltage control method and system

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Embodiment 1

[0042] Such as figure 1 with 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 starting conditions and the trajectory sensitivity of each bus voltage and the voltage sensitivity of the DC feed-in bus, determine whether to start the system-level control and converter station-level control;

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

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 includes step 1 calculating the trajectory sensitivity of each bus voltage and the voltage sensitivity of each control variable to the DC feed-in bus; step 2 judging whether to start system-level control and converter station-level control; step 3 based on wide-area measurement data Calculate the reactive power margin of the generator and determine whether the system-level coordinated control quantity includes the converter station-level control quantity; Step 4 optimizes and solves the corresponding optimal control sequence of the coordinated control of voltage stability; Step 5 judges the two-level system and converter station Whether the control quantities in the optimal control sequence conflict: if there is a conflict, the control quantity is selected according to the coordinated control rules to be applied, and after application, it is checked whether the load bus voltage meets the preset requirements, and if so, exit the coordinated control; otherwise, repeat the steps 1-Step 5, until the load bus voltage meets the preset requirements. It can improve the medium and long-term voltage stability 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 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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Patent Type & Authority Patents(China)
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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