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Adaptive wide-area damping controller

A wide-area damping and self-adaptive technology, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as insufficient damping improvement, and achieve the effect of improving self-adaptive ability, suppressing low-frequency oscillation, and increasing damping improvement

Active Publication Date: 2019-05-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an adaptive wide-area damping controller, which is used to solve the problem that the damping controller in the prior art cannot improve the damping of the power system in place

Method used

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Experimental program
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Embodiment 1

[0051] An adaptive wide-area damping controller such as figure 1 As shown, including: adaptive skew compensator and N-input-output GrHDP unit. Wherein, the adaptive time-delay compensator is used to obtain N first wide-area measurement signals from the power system, perform adaptive time-delay compensation on the N first wide-area measurement signals, and output the N first wide-area measurement signals The N second wide-area measurement signals corresponding to the signals one by one; the N input and output GrHDP unit is used to receive the N second wide-area measurement signals, and based on the GrHDP model algorithm, calculate and obtain the N second wide-area measurement signals A corresponding N first coordinated control signals are output; the adaptive time lag compensator is also used to receive the N first coordinated control signals, and perform adaptive time lag compensation on the N first coordinated control signals to obtain N second coordinated control signals co...

Embodiment 2

[0055] On the basis of Embodiment 1, the adaptive time lag compensator includes: n time lag compensation sub-modules and an additional gain calculation unit. Among them, n delay compensation sub-modules are used to perform adaptive delay compensation on each input signal; the additional gain calculation unit is used to calculate the additional gain value corresponding to the input signal according to the communication delay of each input signal , where the input signal is the first wide-area measurement signal or the first coordinated control signal; then the transfer function of the adaptive time-delay compensator for each input signal is:

[0056]

[0057] Among them, K represents the additional gain value of the input signal, SDC i (s) represents the transfer function of the ith time-delay compensation sub-module, β i (τ) represents the weight of the ith time-delay compensation sub-module, n is the number of time-delay compensation sub-modules, and the value is the orde...

Embodiment 3

[0073] On the basis of Embodiment 2, the simplified input signal delay transfer function is:

[0074] Among them, s represents a complex variable, and τ represents a communication time delay.

[0075] It should be noted that, specifically, the time-delay transfer function G of the input signal using the first-order Pade approximation transform d (s) Approximate simplification, the simplified transfer function is G D (s), its calculation formula is as follows:

[0076]

[0077] to G D (s) is further deformed to obtain the following formula:

[0078] Among them, τ is the communication delay of the input signal, and s is a complex variable.

[0079] This formula is the time-delay transfer function of the input signal in this embodiment. It should be noted that if the time-delay transfer function of the input signal is approximated twice by using different methods, the simplified input signal time-delay transfer function obtained is If they are different, their order w...

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Abstract

The invention relates to an adaptive wide-area damping controller. The adaptive wide-area damping controller comprises an adaptive delay compensator and an N input and output GrHDP unit; the adaptivedelay compensator is used for obtaining N first wide-area measurement signals, performing adaptive delay compensation and outputting N second wide-area measurement signals; the N input and output GrHDP unit is used for receiving the N second wide-area measurement signals and obtaining N first coordinated control signals based on an adaptive dynamic programming algorithm; and the adaptive delay compensator is also used for receiving the N first coordinated control signals and obtaining N second coordinated control signals by calculation based on a GrHDP model algorithm. According to the adaptive wide-area damping controller disclosed by the invention, multiple input and multiple output are carried out by adoption of the GrHDP unit; multi-target coordinated adaptive control on multiple low-frequency oscillation modes of a power system can be simultaneously carried out; the adaptive capability of the power system is improved; furthermore, both the first wide-area measurement signals and the first coordinated control signals are subjected to delay compensation; the control influence of delay onto the power system is greatly avoided; and the damping improvement of the controller onto the power system is improved.

Description

technical field [0001] The invention relates to the technical field of new energy power systems, in particular to an adaptive wide-area damping controller. Background technique [0002] With the increasingly prominent energy problems, the penetration rate of wind power, photovoltaic and other new energy sources in the power system is getting higher and higher. Since the output of new energy sources such as wind and light has common characteristics: strong randomness, volatility, and intermittency, with the increase of its penetration rate, the safe and stable operation of the power system will face severe challenges. In particular, it may It will make the interval low-frequency oscillation problem of the power system more serious. [0003] Since wind power and photovoltaic models generally adopt vector control strategies, their output active power and reactive power are independently adjustable. Combining with wide-area measurement system (wide-area measure system, WAMS) te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 姚伟李培平曾令康艾小猛文劲宇
Owner HUAZHONG UNIV OF SCI & TECH
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