Method and device for establishing impedance model of flexible direct current converter
An impedance model, flexible DC technology, applied in the direction of circuit devices, AC network circuits, power transmission AC networks, etc., can solve the problem that the flexible DC transmission system is not accurate enough, and cannot accurately analyze the oscillation problem of the DC transmission system.
Active Publication Date: 2019-04-09
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology
Due to the neglect of the harmonic signal dynamics in the converter control loop, the flexible DC transmission system is not accurate enough in analyzing the dynamic characteristics of each frequency band, so that the oscillation problem existing in the DC transmission system cannot be accurately analyzed
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[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0063] see figure 1 , which is a schematic diagram of the system structure of a flexible DC converter provided by an embodiment of the present invention. The system structure of the flexible DC converter includes: a phase-locked loop control module, an active power control module, a reactive power control module, The current inner loop control module, abc / dq control module, resistance and reactance, through the establishment of a complete control loop of the flexib...
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The invention discloses a method and a device for establishing an impedance model of a flexible direct current converter. The method comprises the following steps: obtaining the voltage and current information of fundamental waves inside a power grid, a resistance reactance value, and a first voltage harmonic vector and a first current harmonic vector under a plurality of frequencies; carrying outcontrol loop module processing on the voltage and current information of fundamental waves, the first voltage harmonic vector and the first current harmonic vector to obtain a second voltage vector under corresponding frequency; carrying out calculation on the resistance reactance value, the first voltage harmonic vector and the first current harmonic vector to obtain a third voltage vector undercorresponding frequency; and according to the second voltage vector and the third voltage vector, carrying out calculation integration to obtain the impedance model of the flexible direct current converter. According to the method, when the impedance model of the flexible direct current converter is established, the dynamic property of each control loop module inside the flexible direct current converter can be combined, and the dynamic property of the flexible direct current system in each frequency band is analyzed accurately, so that the problem of vibration existing in a direct current power transmission system is analyzed accurately.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to a method and device for establishing an impedance model of a flexible DC converter. Background technique [0002] Flexible DC converters have the characteristics of flexible structure, high controllability, and low output harmonics, so they are widely used in large-capacity, long-distance flexible DC transmission systems. With the putting into use of multiple flexible DC system projects, the oscillation problem related to flexible DC converters has gradually become prominent. The mainstream analysis methods for such oscillation problems all need to build an accurate impedance model of the target system, obtain the impedance curves of the system in different frequency bands, and then use appropriate stability analysis methods to evaluate the oscillation risk of the system in each frequency band and perform optimal control. [0003] The existing method for establishing the i...
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IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/24H02J3/36H02J2203/20Y02E60/60
Inventor 邹常跃许树楷尹聪琦谢小荣赵晓斌李岩陈俊辛清明
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD