A fault fast recovery control method and device for a flexible direct current transmission system
A power transmission system, flexible DC technology, applied in output power conversion devices, AC power input conversion to DC power output, electrical components, etc. The effect of speed, simple and easy installation
Active Publication Date: 2021-09-03
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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- Application Information
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Problems solved by technology
[0005] In order to meet the needs of the prior art, the present invention proposes a fault fast recovery control method and device for a flexible direct current transmission system, which solves the problem that the flexible direct current transmission system is difficult to quickly recover after a fault occurs
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Embodiment Construction
[0067] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0068] This application proposes a fast recovery control method for flexible direct current transmission system faults, such as figure 1 shown, including:
[0069] S1. Calculate the average value of the upper and lower bridge arm capacitor voltages of each phase of the modular multilevel converter, and obtain the upper and lower bridge arm capacitances of each phase of the modular multilevel converter by filtering the fundamental component in the average value DC component of voltage;
[0070] There are many methods for extracting the DC component in the average value of the capacitor voltage, such as low-pass filter and notch filter, etc., which are not limited in the present invention, and are all designated as methods for obtaining the DC component.
[0071] MMC is composed of 6 bridge arms, which are divided into ...
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The present invention provides a method and device for rapid fault recovery control of a flexible direct current transmission system, including calculating the average value of the upper and lower bridge arm capacitance voltages of each phase of a modular multilevel converter, and obtaining the value by filtering the fundamental wave component in the average value The DC component of the upper and lower bridge arm capacitor voltages of each phase of the modular multilevel converter; compare the difference between the DC component of the upper and lower bridge arm capacitor voltages and the preset threshold of the dead zone link to determine the dead zone link output; when the output of the dead zone is the difference between the DC components of the upper and lower bridge arm capacitor voltages, the proportional controller based on proportional integral control is used to adjust its output to obtain the compensation voltage; the compensation voltage and the bridge arm reference Voltage superposition to realize fault fast recovery control of flexible direct current transmission system. In this way, the flexible DC transmission system can be quickly restored to the original operating state after a fault occurs, the impact of the fault on the operating characteristics of the entire system can be reduced, and the operating stability of the system can be improved.
Description
technical field [0001] The present invention relates to the field of high voltage direct current (HVDC) based on voltage source converter (voltage source converter, VSC), including two-terminal direct current transmission technology, multi-terminal direct current transmission technology and direct current grid technology, etc., specifically The invention relates to a fault fast recovery control method and device of a flexible direct current transmission system. Background technique [0002] The world's energy and environmental pollution problems have attracted the attention of various countries. Reducing the consumption of fossil energy and improving the efficiency of the use of renewable energy are the directions that various countries are actively working on. With the vigorous development of renewable energy such as wind power, hydropower and photovoltaics, it is difficult for traditional AC transmission or conventional DC transmission to meet the transmission requirements...
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IPC IPC(8): H02M7/219H02J3/36
CPCH02J3/36H02M7/219Y02E60/60
Inventor 杨杰李云丰吴亚楠孔明范征贺之渊
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD