Method, device and system for stability analysis of voltage source converter grid-connected system considering the influence of phase-locked loop

A system stability, voltage source technology, applied in circuit devices, electrical components, AC network circuits, etc., can solve problems that threaten the safe and stable operation of new energy grid connection and DC transmission systems, power loss, system oscillation, etc., to achieve The effect of simple and efficient judgment

Active Publication Date: 2021-12-17
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under weak connection conditions, the fast feedback control of the converter and improper control links and parameter settings may cause it to exhibit negative resistance characteristics to the outside, and changes in the dynamic characteristics of the voltage source converter system may cause system oscillation problems, thereby threatening new Safe and stable operation of energy grid connection and direct current transmission system
In July 2015, a large-scale power oscillation accident occurred in the Hami area of ​​Xinjiang, my country. The accident caused the torsional vibration protection of three thermal power units in a thermal power plant 300km away from the wind farm to operate one after another, resulting in a power loss of 1280MW
At present, most of the analysis methods for the stability problems brought about by the power electronics of the power system follow the traditional electromagnetic transient simulation, eigenvalue analysis or impedance analysis, but these methods cannot comprehensively and accurately analyze the voltage source variation. The problem of the stability of the connection between the converter and the weak grid

Method used

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  • Method, device and system for stability analysis of voltage source converter grid-connected system considering the influence of phase-locked loop
  • Method, device and system for stability analysis of voltage source converter grid-connected system considering the influence of phase-locked loop
  • Method, device and system for stability analysis of voltage source converter grid-connected system considering the influence of phase-locked loop

Examples

Experimental program
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Effect test

Embodiment 1

[0076] like figure 1 As shown, the voltage source type converter in the embodiment of the present invention includes an equivalent grid and a voltage source converter, wherein the equivalent grid is from infinite ideal voltage source (U ga U gb U gc ), Grid contouring electrical group R 2 , Grid contour inductance 2 Composition; the voltage source converter (VSC converter) is composed of a paneficial transmission electrical main circuit unit and a control unit; an equivalent grid is connected to a voltage source type grid converter electrical primary circuit unit. The grid converter electrical main circuit and the control unit pass and the dot voltage U c Contact the PWM pulse width modulation signal;

[0077] The stability analysis method of the voltage source type converter affected by the lock-phase ring is specifically included in the following steps:

[0078] Step (1) establish an equivalent grid, and the electrical main circuit unit and the control unit of the electrical mai...

Embodiment 2

[0133] Based on the same inventive concepts as in Example 1, embodiments of the present invention provide a stability analysis apparatus for a voltage source type converter considering a phase locked loop, including:

[0134] The first acquisition module is used to obtain the small disturbance state equation of the equivalent grid, the mesh converter electrical main circuit unit and the control unit;

[0135] The generation module is used to generate a relationship between the control unit synchronous coordinate system based on the small disturbance lock-off ring detection error and the corresponding control unit actually synchronized coordinate system variable increment, and generates a control unit involves an axial transformation. State variable calculation formula;

[0136] The second acquisition module is used to obtain a small disturbance state equation of the phase-locked loop;

[0137] The solve module is used to connect the above-described state equation and the variable ...

Embodiment 3

[0141] Based on the same inventive concepts as in Example 1, embodiments of the present invention provide a stability analysis system that considers a voltage source type converter considering a phase-locked loop, including:

[0142] Processor is adapted to implement various instructions;

[0143] The storage device is adapted to store a plurality of instructions, the instructions being adapted to load and perform the steps according to any one of claims 1.

[0144] Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Therefore, the present application may employ a full hardware embodiment, a fully software embodiment, or in the form of a combination of software and hardware embodiments. Moreover, the present application may employ a computer program product that includes a computer available storage medium (including, but not limited to, disk memory, CD-ROM, optical memory, etc.) in ...

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Abstract

The invention discloses a stability analysis method, device and system of a voltage source type converter grid-connected system considering the influence of a phase-locked loop, including: obtaining small disturbances of the equivalent grid and the electrical main circuit unit of the grid-connected converter The state equation, and the small disturbance state equation of the current inner loop, feedforward link and converter pulse width modulation link in the control unit; based on the control unit synchronous coordinate system variable increment and The relationship between the corresponding variable increments of the actual synchronous coordinate system is obtained to obtain the specific relational expression of the variables involved in the transformation of the shaft system; the small disturbance state equation of the phase-locked loop in the control unit is obtained; finally, the aforementioned state equations are combined and substituted into the relevant parameters , solve the system eigenvalues, and complete the stability analysis of the voltage source converter grid-connected system. The invention can simply and efficiently determine the stability and oscillation characteristics of the grid-connected system of the voltage source type converter.

Description

Technical field [0001] The present invention specifically relates to a stability analysis method, apparatus, and system of voltage source type converters considering a phase-locked loop. Background technique [0002] my country's wind energy resource and load reversed, with the increase in power electronic device and renewable energy entry, the multi-scale control mechanism and low inertial broadband response characteristics of power electron becoming technologies have significantly changed the dynamic characteristics of power systems. Large-scale new energy is connected to the grid through remote lines, or transported by remote flow from remote high voltage, so that it is weakened with the intensity of the AC grid connection. Under weak connection conditions, the quick feedback control of the converter and the inappropriate control link and parameter settings may cause negative resistance characteristics, and the dynamic characteristics of the voltage source converter system may...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24H02J3/381H02J2203/20
Inventor 杨尉薇朱玲刘新元郑惠萍刘福锁李威黄锡芳段永泽程雪婷王玮茹薄利明张一帆张谦
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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