Simulation method and system for flexible direct current power transmission device

A flexible DC power transmission and flexible DC technology, applied in circuit devices, AC network circuits, power transmission AC networks, etc., can solve the problems of large computational burden of electromagnetic transient simulation, reduce scientific research efficiency, slow simulation process, etc. Computational burden, large simulation step size, the effect of improving efficiency

Active Publication Date: 2019-03-05
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

Therefore, simulating ultra-large-scale MMC will bring a very large computational burden to electromagnetic transient simulation,

Method used

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  • Simulation method and system for flexible direct current power transmission device
  • Simulation method and system for flexible direct current power transmission device
  • Simulation method and system for flexible direct current power transmission device

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Embodiment Construction

[0046] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0047] According to the characteristics of the external electrical characteristics of MMC in the large-scale power grid simulation, a simulation method and system of flexible DC transmission device is proposed, which can simplify some of the complex control algorithms and internal circuits of MMC and improve its simulation speed. The present invention is especially aimed at system-level simulation research in large power grid simulation. According to the principle of power conservation on the AC and DC sides of the MMC, a controllable voltage source and a controllable current source are used for modeling respectively, which improves the simulation speed. A larger simulation step size can be used in MMC modeling and simulation. Because of the use of a step wave with the nearest level approximation, it can be used to study the characterist...

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Abstract

The invention relates to a simulation method and system for a flexible direct current power transmission device. The method comprises the following steps that: obtaining the reactance and the voltageof a bridge arm, the capacitance of a submodule and a submodule number in the bridge arm; on the basis of the reactance of the bridge arm, the capacitance of the submodule, the submodule number in thebridge arm and a pre-established modularized multi-level current converter model, simulating the flexible direct current power transmission device, and obtaining flexible current and electromechanical transient state operation characteristics under different working conditions of a direct current power grid; and constructing the pre-established modularized multi-level current converter model through a main circuit parameter, an alternating current side equivalent voltage source control quantity and a direct current side controllable current source control quantity.

Description

Technical field [0001] The invention belongs to the field of power electronics, and particularly relates to a simulation method and system of a flexible direct current transmission device. Background technique [0002] Compared with two-level converters, Modular Multilevel Converter (MMC) has a modular design and is easy to expand, avoids the problem of multiple IGBT (Insulated Gate Bipolar Transistor) series connection, and has good harmonic characteristics. Advantages, it is widely used in voltage source converter type high voltage direct current transmission and other fields. [0003] The modular design of MMC is easy to expand, but at the same time it also creates new problems such as a large number of sub-modules, a huge number of nodes, and frequent switching actions that cannot achieve fast simulation and real-time simulation. Take 251-level half-bridge MMC as an example. A converter station requires 1500 sub-modules, each of which has 4 switching elements, and the on and o...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 吴广禄彭红英张星徐得超陈绪江穆清乔小敏徐翌征林因吴丹岳黄道姗黄霆刘智煖苏清梅
Owner CHINA ELECTRIC POWER RES INST
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