Frequency-doubled circulation control method and device of converter and computer equipment
A circulating current control and frequency doubling technology, applied in the field of electric power, can solve the problems of inability to adjust the current peak value of the converter valve, the switching frequency of the capacitor voltage fluctuation, and a single operating index at the same time, and achieve the self-adaptive multi-objective dynamic optimization of all working conditions. Effect
Active Publication Date: 2022-02-11
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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Problems solved by technology
However, the existing technology can only meet the requirements of a single operating index, and cannot simultaneously adjust the operating index such as the peak current of the converter valve, the fluctuation of the capacitor voltage, and the switching frequency.
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[0041] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the application are given in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.
[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.
[0043] Modular Multilevel Converter (MMC) has the advantages of independent adjustment of active power an...
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The invention relates to a frequency-doubled circulation control method of a current converter. The method comprises the steps that the amplitude of a current period of frequency-doubled circulation, the phase angle of the current period, and the stress priority and loss priority of the current converter are obtained; under the condition that the loss priority is higher than the stress priority, the amplitude of the next period is obtained according to the amplitude of the current period and a first preset reduction amount, and the amplitude of the next period and the phase angle of the current period are processed to obtain target double-frequency circulating current; and under the condition that the stress priority is higher than the loss priority, the phase angle of the next period is obtained according to the phase angle of the current period and a second preset value, and the phase angle of the next period and the amplitude of the current period are processed to obtain the target double-frequency circulating current. According to the method, the operation indexes of the current peak value, the capacitor voltage fluctuation and the switching frequency of the current converter can be adjusted by controlling the frequency doubling circulation in the current converter, and full-working-condition self-adaptive multi-target dynamic optimization of the operation indexes of the current converter in power grid operation is achieved.
Description
technical field [0001] The present application relates to the field of electric power technology, in particular to a double frequency circulating current control method, device and computer equipment of a converter. Background technique [0002] With the development of flexible DC projects towards ultra-high voltage and ultra-high power, the capacity of the converter valve group is brought close to the limit. The power system has many operating conditions and complex operating modes. Under various operating modes, it is necessary to dynamically adjust the operating indicators according to the operating conditions. For example, under the condition of high current, it is necessary to reduce the current peak value as much as possible to reduce the current stress; under the condition of heavy AC bus voltage load and the increase of capacitance voltage fluctuation, it is necessary to reduce the capacitance voltage fluctuation and voltage stress; Flow valve loss is also an import...
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IPC IPC(8): H02M7/00H02J3/36
CPCH02M7/00H02J3/36Y02E60/60
Inventor 吴嘉琪刘继平叶石丰陈丽莉杨泽萍岳伟许苑邓烨恒赵杨宇陈奥博彭莱
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD