State space model modeling method of lcc series mmc hybrid converter station
A technology of state space model and modeling method, applied in the field of power transmission and distribution, which can solve the problem of not considering the coupling relationship between the electrical quantities of the converter and so on.
Active Publication Date: 2022-03-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
[0003] At present, there are many research results on the state space model of the DC system of LCC and MMC, but these studies are mainly for a single converter station, and do not consider the coupling relationship between the AC and DC side electrical quantities of different converters in the converter station; For the state space model of LCC series MMC hybrid converter station, there is no relevant literature report at home and abroad
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[0018] The specific implementation of the present invention and the state space model modeling method of an LCC series MMC hybrid converter station proposed by the present invention will be described in detail below in conjunction with the accompanying drawings.
[0019] Such as figure 1 As shown, the LCC series MMC hybrid converter station high-voltage side LCC converter and low-voltage side MMC converter are directly connected in series on the DC side, and connected in parallel through the AC connection line on the AC side. The LCC and MMC converters are directly connected in series on the DC side, and the LCC and MMC are closely related in terms of DC electrical quantities, which are transmitted to the AC system through their respective switching functions; while the AC sides of the LCC and MMC are connected in parallel through tie lines, and then through switches The function is passed back to the DC system, making the relationship between the two closer, that is, the elec...
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The invention relates to a state space model modeling method suitable for describing the coupling relationship of an LCC series MMC hybrid converter station. On the DC side of the converter station, the high-voltage end LCC and the low-voltage end MMC are equivalent to a voltage source series impedance structure ; On the AC side of the converter station, LCC and MMC are respectively equivalent to the structure of current source series impedance and voltage source series impedance, and the switching function of LCC and MMC is used to describe the connection between AC and DC sides; for the DC side equivalent circuit, Define the DC current as the common state variable of the LCC smoothing reactance and the MMC bridge arm reactance, combine the series relationship of the DC side and the mathematical model of the DC current, and establish the mathematical model of the DC side; for the equivalent circuit of the AC side, combine the parallel relationship of the AC side, The electrical quantities of LCC and MMC at the connection line are rotated and transformed to establish a mathematical model on the AC side; the connection between the AC and DC sides of the converter station is constructed by combining the switching functions of LCC and MMC, and finally the state space model is obtained.
Description
technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a modeling method of a state space model of an LCC series MMC hybrid converter station. Background technique [0002] With the development of DC transmission projects towards high voltage and large capacity, HVDC commutation technology has also received extensive attention from academia and engineering circles. The hybrid DC transmission system combines the advantages of the grid commutation converter LCC and the modular multilevel converter MMC, which can reduce costs and operating losses to a certain extent. The converter station composed of LCC and MMC in series is one of the hybrid forms. The high-voltage end of the converter station is LCC, and the low-voltage end is MMC. When the converter station is running in reverse, the LCC can block the DC fault. MMC discharge path; MMC can reduce the probability of LCC commutation failure to a ...
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IPC IPC(8): H02M7/483H02J3/36
CPCH02M7/483H02J3/36H02J2203/20Y02E60/60
Inventor 郭春义崔鹏林欣赵成勇王庆华
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)