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Modular multilevel converter (MMC)-based electromechanical transient simulation method and system of flexible DC and DC power grid

A DC power grid, flexible DC technology, applied to AC networks with the same frequency from different sources, AC network circuits, power transmission AC networks, etc. question

Active Publication Date: 2017-09-01
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of current computer technology and simulation hardware resources, electromagnetic transient simulation must perform equivalent simplification of the AC system when performing large-scale AC and DC power grid simulations, which will lead to differences between the dynamic characteristics of the AC system model and the actual power grid , will also affect the accuracy of the final simulation results

Method used

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  • Modular multilevel converter (MMC)-based electromechanical transient simulation method and system of flexible DC and DC power grid
  • Modular multilevel converter (MMC)-based electromechanical transient simulation method and system of flexible DC and DC power grid
  • Modular multilevel converter (MMC)-based electromechanical transient simulation method and system of flexible DC and DC power grid

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Embodiment 1

[0070] The flow chart of the flexible DC and DC power grid electromechanical transient simulation modeling method proposed by the present invention is as follows figure 1 shown, including:

[0071] S1: Establish 1) a steady-state power flow model based on a controlled current source; 2) a transient model on the AC side; 3) a control system model; 4) a transient model on the DC side and 5) other additional functional modules;

[0072] S2: Using the above model, simulate the electromechanical transient operation characteristics of flexible DC and DC grids under different working conditions.

[0073] Before establishing the steady-state power flow model based on the controlled current source, it also includes: determining the steady-state power flow parameters, that is, determining the injected bus voltage, current, active power and reactive power of the MMC converter.

[0074] in:

[0075] S101: Establish a steady-state power flow model based on a controlled current source, th...

Embodiment 2

[0114] Based on the same inventive concept, the present invention also provides a flexible DC and DC power grid electromechanical transient simulation system based on MMC converters, including:

[0115] Modeling module: used to establish steady-state power flow model based on controlled current source, AC side transient model, control system model, DC side transient model and additional function model;

[0116] Simulation module: It is used to simulate the electromechanical transient operation characteristics of flexible DC and DC power grids under different working conditions by using the above models.

[0117] Modeling modules, further including:

[0118] Power flow model modeling module: used to establish the initial power flow data required for generating transient simulations, and a steady-state power flow model based on a controlled current source;

[0119] AC model modeling module: used to establish a transient model of the AC side for simulating the dynamic characteri...

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Abstract

The invention relates to a modular multilevel converter (MMC)-based electromechanical transient simulation method and system of a flexible DC and DC power grid. The method comprises the step of building a transient simulation model, wherein the transient simulation model comprises a controlled current source-based steady-state power flow model, an AC-side transient model and a DC-side transient model, and the controlled current source-based steady-state power flow model is used for generating initial power flow data required by transient simulation. The method involves at least one additive module based on an outer ring control structure for function expansion, the additive module is used for setting a shunting signal between an AC side and a DC side of the flexible DC and DC power grid to generate a logic and is connected by the outer ring control structure of the AC side and the DC side of the flexible DC and DC power grid, and the electromechanical transient running characteristic of the flexible DC and DC power grid under different working conditions is simulated by the transient simulation model. By the method, the calculation of an initial value of a DC network is not considered, the steady-state power flow model is simplified on the premise of no influence on transient simulation accuracy and stability, and the expansibility of the model is improved.

Description

technical field [0001] The invention relates to a digital simulation technology for flexible direct current transmission, in particular to an MMC-based electromechanical transient simulation method and system for flexible direct current and direct current power grids. Background technique [0002] The Voltage Source Converter Based High Voltage Direct Current (VSC-HVDC) technology has the advantages of no commutation failure, fast independent control of active and reactive power, etc. Asynchronous grid interconnection and other aspects are considered to be the most effective technical solutions. VSC-HVDC has different topologies, among which Modular Multilevel Converter (MMC) has become a research hotspot due to its low switching frequency, low harmonic content and easy expansion, and has achieved engineering Applications. [0003] MMC contains a large number of power electronic switching devices, and it is suitable to use electromagnetic transient simulation tools to simu...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/06H02J3/36
CPCH02J3/00H02J3/06H02J3/36H02J2203/20Y02E60/60
Inventor 刘栋寇龙泽庞辉贺之渊朱琳吴学光
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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