Modular multilevel converter impedance correction device design method and correction device
A modular multi-level, impedance correction technology, applied in the direction of circuit devices, harmonic reduction devices, electrical components, etc., can solve the uncertain impedance characteristics of other frequency bands, oscillation stability problems and complex control, complex internal dynamic behavior, etc. problems, to achieve the effect of improving system operation stability, weakening adverse effects, and improving AC impedance characteristics
Active Publication Date: 2021-02-09
XUJI GRP +3
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Problems solved by technology
Compared with the two-level voltage source converter, the modular multilevel converter topology has more complex internal dynamic behavior, so its oscillation stability problem and control are very complicated
In addition, the control system link delay of the modular multilevel converter in the project is long, which makes the control strategy for oscillation suppression for a certain frequency unable to adjust the output of the converter in a timely and accurate manner as expected, and thus cannot Accurately adjust the impedance of the converter at this frequency, and have an uncertain control effect on the impedance characteristics of other frequency bands
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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.
[0029] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. figure 1 A schematic diagram of the circuit structure of a modular multilevel converter is shown, figure 1 The modular multilevel converter shown in includes six bridge arms. A single bridge arm is composed of multiple sub-modules cascaded and connected in series with bridge arm reactors...
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The invention relates to a modular multilevel converter impedance correction device design method and an impedance correction device. The impedance correction device is connected to the alternating current network side of a modular multilevel converter, and according to the frequency requirement of converter impedance correction, each equipment parameter of the impedance correction device can be obtained through a specific design method. Capacitors and inductors are introduced to the alternating current side of a modular multilevel converter through a primary equipment means, so the alternating current impedance characteristic of the modular multilevel converter is directly and accurately improved, the problem that oscillation is difficult to accurately and effectively solve through a control means is solved, the impedance characteristic of the flexible direct current converter is guided by primary equipment, the adverse effect of a complex control system and long link delay thereof onthe impedance characteristic is reduced or weakened, and the operation stability of the system is improved.
Description
technical field [0001] The present invention relates to the technical field related to flexible direct current transmission, in particular to a design method of an impedance correction device for a modular multilevel converter, an impedance correction device, and a modular multilevel converter system using the impedance correction device. Background technique [0002] The flexible DC transmission technology based on the voltage source converter has been vigorously researched and applied in recent years because of its fast and flexible active and reactive power control, which can provide voltage support for the AC grid and has no commutation failure. Compared with the traditional two-level and three-level converter topologies, the modular multi-level converter topology adopts sub-module cascading, which is easier to achieve high voltage levels, reduces AC harmonics, and greatly improves the high-voltage flexible DC The feasibility of the power transmission project has promote...
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Login to view more IPC IPC(8): H02J3/24H02J3/01H02J3/00
CPCH02J3/241H02J3/01H02J3/002Y02E40/40Y02E60/60
Inventor 杨美娟刘启建薛瑞李道洋行登江王先为赵菲
Owner XUJI GRP
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