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Rapid simulation method and system for modular DC side active power balancing device

A technology of active power and balance device, which is applied in special data processing applications, instruments, electrical digital data processing, etc. problems, to achieve the effect of improving design efficiency, reducing the number of computing nodes, and speeding up the simulation speed

Pending Publication Date: 2020-10-02
STATE GRID ECONOMIC TECH RES INST CO +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the huge number of sub-modules of the modular DC-side active power balance device (the second type), the calculation efficiency for electromagnetic transient simulation is very low, and it is difficult to meet the requirements of engineering planning and design
The reason for the low simulation calculation speed of the electromagnetic transient model of the modular DC-side active power balance device is mainly that each power electronic switch is described in detail, and a large number of nonlinear element models result in a huge order of the system admittance matrix. In each simulation step To solve the system state variables internally, a large-scale admittance matrix inversion operation is required
[0007] The existing technology mainly focuses on the simplified modeling of modular multilevel converters using half-bridge sub-modules and full-bridge sub-modules, but for the simplified modeling and The rapid simulation method has not been covered in the literature

Method used

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  • Rapid simulation method and system for modular DC side active power balancing device
  • Rapid simulation method and system for modular DC side active power balancing device
  • Rapid simulation method and system for modular DC side active power balancing device

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Embodiment 1

[0105] In order to further verify the effectiveness and feasibility of the present invention, the present invention will be further described by the following examples:

[0106] Build the corresponding model in the power system transient simulation software PSCAD / EMTDC. The specific simulation parameters are: ±400 kV, 1100 MW flexible DC project, 10 branch sub-modules of the active power balance device on the DC side, and the module capacitance is 50 microfarads. The energy dissipation resistance of the module is 58.2 ohms, the voltage equalizing resistance is 120 kohms, and the on-state resistance of the diode is 0.01 ohms.

[0107] Such as Figure 5(a) ~ Figure 5(b) , Figure 6(a) ~ Figure 6(b) As shown, in this embodiment, a three-phase short-circuit fault on the AC side of the receiving end occurs at 2s during the steady-state operation, and then the active power balance device on the DC side is put into operation, and the DC voltage drops. The equivalent modeling and fas...

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Abstract

The invention relates to a rapid simulation method and system for a modular DC side active power balancing device, and the method comprises the following steps: (1), carrying out the electromagnetic transient modeling of various types of elements contained in the modular DC side active power balancing device, and obtaining the equivalent models of the various types of elements; (2) simplifying each power balance sub-module in the modular DC side active power balance device according to the equivalent model of each component to obtain a simplified model of each power balance sub-module; (3) according to the simplified model of each power balance sub-module obtained in the step (2), modeling each energy consumption branch forming the modular DC side active power balance device to obtain an equivalent model of each energy consumption branch; (4) performing electromagnetic transient simulation on the established equivalent model of each energy consumption branch to obtain an electromagnetic transient simulation result of the modular DC side active power balancing device. The simulation speed of the system can be greatly increased, and the method can be widely applied to the technical field of high-voltage flexible DC power transmission.

Description

technical field [0001] The invention relates to the technical field of high-voltage flexible direct current transmission, in particular to a fast simulation method and system for a modularized direct current side active power balance device. Background technique [0002] The DC side active power balance device is one of the key equipment to solve the power surplus of the offshore wind power direct transmission project, and it is arranged on the DC side of the converter valve. There are roughly three types of DC side active power balance devices in terms of technical realization principles: [0003] 1) Centralized type: The full-control power device adopts a straight-series method to form a power balance valve, and the power balance resistors are arranged in a centralized manner. The structure is shown in Figure 1(a); [0004] 2) Distributed: A large number of sub-modules are cascaded, and power devices and power balancing resistors are distributed in each sub-module. When ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/3308
CPCG06F30/3308
Inventor 付颖薛英林田园园赵峥卢亚军陈钊
Owner STATE GRID ECONOMIC TECH RES INST CO
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