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Flexible multi-state switch control method and system based on fuzzy logic PI controller

A technology of switch control and fuzzy logic, applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc., can solve the non-linear characteristics of PI controller design that can not achieve the effect, parameter changes, load disturbance To reduce the impact of load disturbance and improve adaptability and robustness

Active Publication Date: 2021-05-14
SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, parameter changes, load disturbances, and nonlinear characteristics of the actual power grid have a great influence on the design of conventional PI controllers, which cannot achieve good results.

Method used

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  • Flexible multi-state switch control method and system based on fuzzy logic PI controller
  • Flexible multi-state switch control method and system based on fuzzy logic PI controller
  • Flexible multi-state switch control method and system based on fuzzy logic PI controller

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Experimental program
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Effect test

Embodiment 1

[0051] Such as Figure 1-5 As shown, the present invention provides a flexible multi-state switch control method based on fuzzy logic PI controller

[0052] law, including:

[0053] 1. Determine the input and output power of the three-terminal flexible multi-state switch when the system is in a steady state and the DC side voltage is constant;

[0054] During the period, the loss of the converter and the corresponding line is expressed as an equivalent impedance, and the converter and switching losses are ignored

[0055] Specifically: the dynamic differential equation in the three-phase stationary abc coordinate system is expressed as:

[0056]

[0057] Among them, R is the equivalent impedance of the converter side, L is the inductance of the converter side, i kj is the phase current of the AC system, E kj is the phase voltage of the AC system, m kj is the switching function of the three-phase bridge arm, U dc is the DC side voltage, k represents the intended phase ...

Embodiment 2

[0081] A three-terminal flexible multi-state switch control system based on a fuzzy logic PI controller is provided, including:

[0082] Power determination module: used to determine the input and output power of the three-terminal flexible multi-state switch when the system is in a steady state and the DC side voltage is constant;

[0083] Outer loop control module: used to control the outer loops on the VSC1 and VSC3 side with active power and reactive power according to the input and output power of the three-terminal flexible multi-state switch to obtain the reference estimated current value of the two, and then use the reference current value of the two The estimated current value is superimposed on the current correction amount to obtain the respective output current reference value; the outer loop on the VSC2 side is controlled by a constant DC voltage, and the PI controller is used to obtain its output current reference value;

[0084] Inner loop control module: used t...

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Abstract

The invention discloses a flexible multi-state switch control method based on a fuzzy logic PI controller. The flexible multi-state switch control method comprises the following steps of: determining the input and output power of a three-terminal flexible multi-state switch when the system is in a steady state and the direct current side voltage is constant; according to the input and output power of the three-terminal flexible multi-state switch, adopting active power and reactive power control for outer rings at VSC1 and VSC3 sides to obtain reference estimated current values of the outer rings at the VSC1 and VSC3 sides, and then superposing reference estimated current values of the outer rings at the VSC1 and VSC3 sides with current correction values to obtain respective output current reference values; performing constant direct-current voltage control on an outer ring at the a VSC2 side, and acquiring an output current reference value by using a PI controller; and adopting a fuzzy logic PI controller for inner rings at the three sides of VSC1, VSC2 and VSC3 to calculate actually-measured output currents and output current reference values to obtain output reference voltages, and then subjecting the output reference voltages to SPWM conversion to obtain converter gate trigger signals. The flexible multi-state switch control method uses fuzzy logic to perform online adjustment on control parameters, and has high adaptability and robustness.

Description

technical field [0001] The invention belongs to the technical field of power grid control, and in particular relates to a flexible multi-state switch control method and system based on a fuzzy logic PI controller. Background technique [0002] With the rapid development of the power system, a large number of intermittent distributed generators (Distributed Generator, DG) and loads are connected to the distribution network, which poses more serious challenges to the power quality of the power grid. The power quality control device with a single function or mode can no longer Meet the use requirements. The multi-functional and multi-mode smart grid will become a trend, and its safe, reliable, high-quality and efficient operation can effectively ensure the stability of the power system. [0003] The flexible multi-state switch (FMSS) can replace the sectional switch on the feeder or the tie switch between the feeders, connect multiple feeders in the distribution network, and p...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/088
CPCH02M7/219H02M1/088
Inventor 马晓芳吉耀辉李有池曹彪姜峰
Owner SUZHOU R&D CENT OF NO 214 RES INST OF CHINA NORTH IND GRP
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