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A Calculation Method and Device for Small Signal Impedance of Modular Multilevel Converter

A modular multi-level, calculation method technology, applied in the direction of circuit devices, output power conversion devices, power transmission AC networks, etc., can solve the problems of consuming computing resources and time, high computational complexity, etc., to reduce complexity, Save time and improve design efficiency

Active Publication Date: 2021-12-07
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a method and device for calculating the small-signal impedance of a modular multilevel converter, which solves the problem of calculating the AC and DC side impedance of a modular multilevel converter in the prior art. Problems with high complexity, computational resource and time consumption

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  • A Calculation Method and Device for Small Signal Impedance of Modular Multilevel Converter
  • A Calculation Method and Device for Small Signal Impedance of Modular Multilevel Converter
  • A Calculation Method and Device for Small Signal Impedance of Modular Multilevel Converter

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Embodiment 1

[0041] An embodiment of the present invention provides a method for calculating the small-signal impedance of a modular multilevel converter, such as figure 1 shown, including the following steps:

[0042] Step S1: Obtain the operating condition information of the flexible direct current transmission system.

[0043] In the embodiment of the present invention, the main components of the flexible direct current transmission (VSC-HVDC) system include a voltage source converter (VSC), a converter transformer, a commutation reactor, a direct current capacitor and an alternating current filter, etc. Operational condition information of DC transmission system. For example, the operating condition of a substation is essentially the working condition of the substation. As far as a certain equipment in the substation is concerned, there are three working conditions: 1. Operating status; 2. Maintenance status; 3. Standby status (including hot standby and cold standby ), master the ope...

Embodiment 2

[0089] An embodiment of the present invention provides a calculation device for small-signal impedance of a modular multilevel converter, such as Figure 5 shown, including:

[0090] The obtaining module 1 is used to obtain the operating condition information of the flexible direct current transmission system; this module executes the method described in step S1 in Embodiment 1, and details are not repeated here.

[0091] The first model building module 2 is used to build a power level model by using the operating condition information and the circuit topology of the converter; this module executes the method described in step S2 in Embodiment 1, which will not be repeated here.

[0092] The second model building module 3 is used to use the small signal component of the bridge arm modulation signal of each control module of the converter to establish a control level small signal model; this module executes the method described in step S3 in Embodiment 1, here No longer.

[0...

Embodiment 3

[0096] An embodiment of the present invention provides an electronic device, such as Figure 6 As shown, it includes: at least one processor 401 , such as a CPU (Central Processing Unit, central processing unit), at least one communication interface 403 , memory 404 , and at least one communication bus 402 . Wherein, the communication bus 402 is used to realize connection and communication between these components. Wherein, the communication interface 403 may include a display screen (Display) and a keyboard (Keyboard), and the optional communication interface 403 may also include a standard wired interface and a wireless interface. The memory 404 may be a high-speed RAM memory (Ramdom Access Memory, volatile random access memory), or a non-volatile memory (non-volatile memory), such as at least one disk memory. Optionally, the memory 404 may also be at least one storage device located away from the aforementioned processor 401 . The processor 401 can execute the method for ...

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Abstract

The invention discloses a method and device for calculating the small-signal impedance of a modularized multilevel converter. The method includes: acquiring operating condition information of a flexible direct current transmission system; utilizing the operating condition information and the circuit topology of the converter structure, establish a power level model; use the small signal component of the bridge arm modulation signal of each control module of the converter to establish a control level small signal model; use the power level model, control level small signal model and each electrical quantity of each control module, The small-signal impedance of the modular multilevel converter is calculated. The present invention integrates the small-signal impedance models of the AC and DC sides of the modular multi-level converter, which can be directly used for the resonance and small-signal stability analysis of the modular flexible DC system, without the need for computer simulation to measure and obtain The external small-signal impedance of the modular flexible DC converter reduces the complexity of calculation, greatly saves the time of small-signal stability analysis of the modular flexible DC system, and improves the design efficiency.

Description

technical field [0001] The invention relates to the field of flexible direct current transmission, in particular to a method and device for calculating the small-signal impedance of a modular multilevel converter. Background technique [0002] Flexible DC is a cutting-edge technology that is urgently needed to improve the acceptance capacity of renewable energy and support energy transformation. Based on this technology, Europe has formulated a "super grid" plan across Europe and North Africa, and plans to build hundreds of flexible DC projects. Due to the high degree of power electronics, the flexible DC transmission project is prone to resonance. The small signal impedance analysis is an effective tool for analyzing the resonance of the flexible DC transmission project. The key step is to obtain the external small signal impedance of the flexible DC converter. characteristic. [0003] At present, the main way to obtain the small-signal impedance of the modular multilevel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36G06F30/20H02M7/00
CPCG06F30/20H02J3/36H02M7/00H02J2203/10H02J2203/20Y02E60/60
Inventor 季柯庞辉杨杰刘杉许伟华周啸汤广福
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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