Efficient simulation method for multi-converter centralized grid-connected system
A simulation method and converter technology, which are applied to instruments, special data processing applications, electrical and digital data processing, etc., can solve the problems of low simulation accuracy, complex modeling methods, and insignificant speed-up effect, and reduce calculation time. , Decoupling the effect of flexible position
Active Publication Date: 2021-03-09
通号(长沙)轨道交通控制技术有限公司
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Problems solved by technology
[0011] It can be seen from the above that the existing multi-converter centralized grid-connected system high-efficiency simulation modeling methods have problems such as complex modeling methods, limited versatility, low simulation accuracy, and inconspicuous speed-up effects to varying degrees.
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Embodiment 1
[0054] Embodiment one, such as Figure 4 The original structure diagram of centralized grid-connected multi-converters is shown. If the maximum distance between the grid-connected positions of multiple converters is less than a specified positive number, such as 0.01km, it can be approximately considered that the grid-connected positions of all converters are at the same point. That is, centralized grid connection, Figure 4 The multi-converter centralized grid-connected system can be regarded as including multiple Figure 5 The structure shown consists of, Figure 5 is the topological structure diagram of the kth converter, in the figure, V s i sk are the grid-side voltage and grid-side current of the k-th converter, respectively.
[0055] Based on the implicit trapezoidal method with damping and the turn-on / turn-off characteristics of power electronic switches, the present invention derives and adopts the branch of current source parallel admittance to simulate the inter...
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The invention discloses an efficient simulation method for a multi-converter centralized grid-connected system, and provides a high-efficiency simulation method for a multi-converter centralized grid-connected system, which integrates a converter switch and support capacitor equivalent modeling technology and a converter Norton equivalent technology. The efficient simulation method provided by theinvention is high in universality, and is suitable for a multi-converter centralized grid-connected system of any power electronic switch (IGBT, thyristor, diode, ideal switch and the like); and thealgorithm organization is simple, the simulation efficiency and precision are high, and large system behavior characteristics, converter module internal electrical transient characteristics and the like can be simulated at the same time.
Description
technical field [0001] The invention relates to the technical field of power electronics simulation modeling, in particular to an efficient simulation method for a centralized grid-connected system with multiple converters. Background technique [0002] With the development of power electronics technology and the increase of application requirements, the scale of multi-converter grid-connected systems is getting larger and larger, such as vehicle-network systems, wind farms, and photovoltaic power stations. Due to the large number of converters, the interaction mechanism between the converters and between the converters and the grid is complex, the optimal matching of the converter device and the grid and the coordinated control of the converter group are difficult. Once an accident occurs, many The equipment is damaged, the economic loss is huge, the repair cost is high, and the time period is long. Therefore, the safe, stable and reliable operation of the multi-converter ...
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IPC IPC(8): G06F30/367
CPCG06F30/367G06F2113/04G06F2113/06
Inventor 吴鹤翔张杰余家华曾力勇潘卫国
Owner 通号(长沙)轨道交通控制技术有限公司