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Reactive damping controller based on flexible excitation system and parameter setting method

A technology for damping controllers and excitation systems, applied in control systems, controlling generators, reducing/preventing power oscillations, etc. It can solve the complex design of controller parameter setting, difficulty in providing strong damping in multiple modes, and difficulty in field application, etc. question

Active Publication Date: 2020-01-17
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional single-channel power system stabilizers, such as the widely used PSS2B, are difficult to provide strong damping in multiple modes at the same time due to the limitations of parameter setting
Although PSS4B can solve the problem of simultaneous suppression of low-frequency oscillations in multiple frequency bands, the three channels of PSS4B have coupling effects and mutual influence, and the setting design of controller parameters is complicated, which is not easy for field application

Method used

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  • Reactive damping controller based on flexible excitation system and parameter setting method
  • Reactive damping controller based on flexible excitation system and parameter setting method
  • Reactive damping controller based on flexible excitation system and parameter setting method

Examples

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Effect test

Embodiment 1

[0086] Such as image 3 A reactive damping controller based on a flexible excitation system for the 0.1Hz-0.5Hz frequency band is shown, which includes:

[0087] Two-way signal input terminals 110 and 120, which are respectively used to receive the rotational speed signal 108 and the electric power signal 109 representing the operating state of the unit;

[0088] An acceleration power signal synthesis link 140, which is used to synthesize and process the rotational speed signal 108 and the electric power signal 109 into an acceleration power signal 107 that can represent the power oscillation of the unit;

[0089] A band-pass filtering link 150, which is used to filter out non-predetermined frequency signals in the acceleration power signal 107 to obtain the acceleration power filter signal 106 within a predetermined frequency range;

[0090] Phase shift gain and output limiting link 160, which is used to provide the phase difference and gain ratio between the acceleration po...

Embodiment 2

[0138] This embodiment provides a reactive damping controller based on a flexible excitation system for the entire frequency range of 0.1 Hz-2.5 Hz. Will image 3 The band-pass filtering link of the reactive damping controller is canceled and set as a path, such as Figure 4 shown, which includes:

[0139] Two-way signal input terminals 110 and 120, which are respectively used to receive the rotational speed signal 108 and the electric power signal 109 representing the operating state of the unit;

[0140] An acceleration power signal synthesis link 140, which is used to synthesize and process the rotational speed signal 108 and the electric power signal 109 into an acceleration power signal 107 that can represent the power oscillation of the unit;

[0141] Phase shift gain and output limiting link 160, which is used to provide the phase difference and gain ratio between the acceleration power signal 107 and the oscillation damping control signal 105, and limit the output os...

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Abstract

The invention discloses a reactive damping controller based on a flexible excitation system and a parameter setting method. The controller is composed of a double-channel signal input end, an acceleration power signal synthesis link, a phase shift gain and output amplitude limiting link and a control signal output end. The parameter setting method comprises the following steps of setting the parameters of the acceleration power signal synthesis link; establishing a theoretical uncompensated characteristic mathematical model of a reactive damping channel of a flexible excitation system; and establishing a reactive damping controller compensation characteristic mathematical model, solving an optimal solution of the control parameters of a phase shift link of a reactive damping controller byusing an intelligent optimization algorithm, solving a critical gain by using a root locus method, and finally setting the gain of the reactive damping controller according to a damping calculation formula. The controller can replace a power system stabilizer to provide damping for a full frequency band of low-frequency oscillation, and can also independently design a damping strengthening strategy for a specific frequency band by utilizing the advantage of channel independence, so that the full-effect suppression effect of excitation control on the multi-mode low-frequency oscillation of a power system is improved.

Description

technical field [0001] The invention belongs to the related field of generator excitation additional control, in particular to a reactive damping controller and a parameter setting method based on a flexible excitation system. Background technique [0002] The power system stabilizer (PSS) based on the conventional excitation system is an effective and economical method to suppress the low-frequency oscillation of the power system. The control has the stable control requirement of simultaneously suppressing low-frequency oscillations in different modes. [0003] Traditional single-channel power system stabilizers, such as PSS2B, which is widely used at present, are difficult to provide strong damping in multiple modes at the same time in the low frequency band, mid frequency band and high frequency band due to the limitation of parameter setting. Although PSS4B can solve the problem of simultaneous suppression of low-frequency oscillations in multiple frequency bands, the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02P9/10
CPCH02J3/24H02P9/105
Inventor 张建承吴跨宇毛承雄张甜甜俞鸿飞段文华熊鸿韬楼伯良汪宗恒沈轶君房乐
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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