A Method of Suppressing Low-frequency Oscillation of AC-DC Hybrid Grid Based on VSC-HVDC
An AC-DC hybrid, low-frequency oscillation technology, used in AC network circuits, power transmission AC networks, reducing/preventing power oscillations, etc. The effect of suppressing low frequency oscillation and improving the damping ratio of system eigenvalues
Active Publication Date: 2021-11-02
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD +1
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Existing literature has proposed a coordinated control method that combines static synchronous compensators and DC additional damping controllers. This control method emphasizes controlling the bus voltage of the AC system to improve the ability to resist commutation failures, thereby greatly reducing small disturbance failures. stability risk, but this method limits the active power sent by DC
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0029] The present invention proposes an integrated control controller to simulate low-frequency oscillation based on VSC-HVDC AC-DC hybrid power grid. The block diagram of its control system is as follows figure 1 shown.
[0030] In the figure, V s ∠θ s is the voltage amplitude and phase angle of the bus, I lac is the AC line current, P lac +jQ lac For AC line transfer power, V sh , I sh Converter VSC 1 Output voltage and output current, V se , I se Converter VSC 2 Output voltage and output current, V c For the DC converter VSC DC Head end voltage, V dc is the DC capacitor voltage, I dc is the DC line current; K p1 、K p2 、K p3 is the proportional coefficient of PI link, K i1 、K i2 、K i3 is the integral coefficient of the PI link, T W is the DC blocking time constant, T a , T b , T c , T d , T e , T f is the time constant of the lead-lag link; y 1 、y 2 、y 3 is the state variable of the comprehensive damping controller, including the voltage V sh ,...
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
Login to View More Abstract
The invention relates to a method for suppressing low-frequency oscillation of a VSC‑HVDC-based AC-DC hybrid power grid. The integrated controller of the invention controls the voltage of the AC bus through a parallel-side converter, and the series-side converter controls the line active power. The DC voltage is controlled by the converter; the additional damping controller of the converter introduces the bus voltage variation and the amplitude variation passes through the PI control link and the lead-lag link to input the reactive power variation at the end of the line to the converter 1, and the converter 2 additionally The damping controller introduces the variation of the bus voltage phase angle through the PI control link and the lead-lag link to input the variation of the active power at the end of the line to the converter 2; the additional damping control of the DC converter introduces the variation of the active power at the end of the line through the DC blocking link , PI control and other links output the DC current variation to the DC converter. The invention can accurately make the system eigenvalue damping ratio of the damped controller meet the requirement of suppressing low-frequency oscillation.
Description
technical field [0001] The invention belongs to the field of stable operation and control of AC and DC hybrid power grids. Specifically, it relates to a method for suppressing low-frequency oscillation of a VSC-HVDC AC / DC hybrid grid, so as to improve the stable operation of the AC / DC hybrid grid. Background technique [0002] In view of the low-frequency oscillation phenomenon in the VSC-HVDC AC-DC hybrid system, DC additional damping controllers are currently being used at home and abroad to improve the stability of the DC system and suppress low-frequency oscillations. Existing literature has proposed a coordinated control method that combines static synchronous compensators and DC additional damping controllers. This control method emphasizes controlling the bus voltage of the AC system to improve the ability to resist commutation failures, thereby greatly reducing small disturbance failures. stability risk, but this method limits the active power sent by DC. Contents...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/24H02J3/36H02J2003/365Y02E60/60
Inventor 刘俊磊刘思捷钱峰杨韵钟雅珊彭红英陈绪江刘敏程昱杨宏涛唐爱红
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD