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Method for dynamically adjusting parameters of current inner loop controller

A dynamic adjustment, current inner loop technology, applied in the direction of reducing/preventing power oscillation, can solve the problem that the delay cannot be suppressed indefinitely, so as to reduce the risk of high-frequency oscillation, suppress the function of high-frequency oscillation, and achieve fast adjustment speed. Effect

Active Publication Date: 2019-05-31
STATE GRID CORP OF CHINA +2
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Problems solved by technology

However, due to the inherent characteristics of the digital control system, the delay cannot be suppressed without limit, so it is necessary to consider the control method in order to reduce the risk of high-frequency oscillation and achieve the purpose of improving the reliability and stability of operation

Method used

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  • Method for dynamically adjusting parameters of current inner loop controller
  • Method for dynamically adjusting parameters of current inner loop controller
  • Method for dynamically adjusting parameters of current inner loop controller

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0040] As shown in Fig. 1(a) and Fig. 1(b), the present invention firstly introduces the control of the inner loop and the outer loop in the control system of the soft-to-direct converter station. The inner loop part includes the inner loop controller, voltage feedforward, current cross decoupling items, etc. The figure shows the current inner loop controller, which is composed of proportional control and integral controller, and the size of the proportional controller is called Scale factor k p , the denominator of the integral controller is the Laplacian operator s, and the numerator is the integral coefficient k i . The inner ring part is composed of a d-axis channel and a q-axis channel, the d-axis channel controls the d-axis current, and the q-axis channel controls the q-axis current. The d-axis channel and q-axis channel in the inner ring par...

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Abstract

The invention relates to a method for dynamically adjusting parameters of a current inner loop controller. The method comprises steps of 1) determining the minimum and maximum values of the proportional coefficients and the integral coefficients of d-axis channel and q-axis channel current inner loop controllers on the premise of not causing high-frequency oscillation according to the strength ofa connected AC system and the dynamic response speed requirement of a flexible DC converter station, to obtain a parameter dynamic adjustment range; and 2) according to a maximum error value that mayoccur between a reference current and an actual current and the parameter dynamic adjustment range determined in the step 1), dynamically adjusting the proportional coefficients and the integral coefficients of the current inner loop controllers by a preset controller parameter adjustment rule, to obtain the optimal values of the proportional coefficients and the integral coefficients. The methodcan be widely used for the dynamic adjustment of the parameters of the inner loop control system in a flexible DC transmission engineering, and can reduce the risk of high-frequency oscillation of theflexible DC engineering and improve the operational stability of the flexible DC engineering under the condition of satisfying the steady state characteristic, the dynamic characteristic and the transient response characteristic.

Description

technical field [0001] The invention relates to a method for designing parameters of a current controller in the field of flexible direct current transmission, including a method for adjusting parameters of a current inner loop controller for two-terminal, multi-terminal and DC power grid systems, and specifically relates to a current inner-loop controller parameter that takes into account both response speed and stability Dynamic adjustment method. Background technique [0002] Flexible high voltage direct current (HVDC) using modular multilevel converter (MMC) is a new generation of power transmission technology that has developed rapidly in the past decade. With the maturity of flexible DC technology and equipment manufacturing level, the voltage and power level of flexible DC projects are gradually increasing. For example, the single converter of Zhangbei DC Power Grid Project has reached 1500MW / 500kV. MMC is composed of a series of cascaded sub-modules. Each sub-module...

Claims

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Application Information

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IPC IPC(8): H02J3/24
Inventor 郭贤珊刘杰李云丰梅念卢亚军熊凌飞
Owner STATE GRID CORP OF CHINA
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