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Converter topology structure for large megawatt power grid characteristic real-time simulation device

A technology for power grid characteristics and real-time simulation, applied in measurement devices, measurement of electrical variables, harmonic reduction devices, etc., can solve problems such as the inability to effectively simulate high voltage dynamic response performance and the limited number of harmonics.

Inactive Publication Date: 2021-04-20
NANJING UNIV OF SCI & TECH +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the inverter part of the power grid simulation device uses a single inverter topology, which can achieve a limited number of harmonics and cannot effectively simulate high-voltage dynamic response performance.

Method used

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  • Converter topology structure for large megawatt power grid characteristic real-time simulation device
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  • Converter topology structure for large megawatt power grid characteristic real-time simulation device

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Embodiment Construction

[0019] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0020] In one embodiment, combined with figure 1 , providing a converter topology for a real-time simulation device for large-megawatt power grid characteristics, the structure includes a high-power simulation unit 1, a high-voltage dynamic response performance simulation unit 2, an LCL filter 3, and a three-phase isolation transformer 4 and a three-phase load 5;

[0021] The high-power analog unit 1 is used to simulate the fundamental frequency and low frequency changes of the grid voltage, and provide the main support for power exchange with the three-phase load 5;

[...

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Abstract

The invention discloses a converter topology structure for a large megawatt power grid characteristic real-time simulation device, and the structure comprises a high-power simulation unit which simulates the fundamental frequency and low-frequency changes of a power grid voltage, and provides a main support for the power exchange with a three-phase load; a high-voltage dynamic response performance simulation unit which has a transient time scale response rate, simulates high-frequency and non-sinusoidal transient changes of the power grid voltage, and provides auxiliary support for power exchange; two simulation unit output ends are connected in series and then are connected with a three-phase load through an LCL filter and a three-phase isolation transformer. According to the invention, high-power requirements and power grid transient characteristic simulation requirements are separately realized, and a modular cascaded multilevel topological structure is adopted, so that the voltage dynamic response performance of the simulation device can be further improved while high-megawatt power exchange with a load is carried out safely and efficiently, the structure is especially suitable for performance analysis of an access type power generation system of a high-capacity power electronic device.

Description

technical field [0001] The invention belongs to the field of performance analysis of a power electronic access type power generation system, in particular to a variable current topological structure used for a real-time simulation device for characteristics of a large megawatt power grid. Background technique [0002] With the rapid development of new energy power generation technology, the single-unit capacity of new energy generating units connected to the grid is also increasing. In order to ensure the safety and stability of the system operation after grid connection, it is usually necessary to test the performance of such power electronic device-connected power generation systems in a laboratory environment. However, with the increase of system capacity, traditional power grid simulators can no longer meet the simulation requirements in related tests. Therefore, there is an urgent need to develop a real-time simulation device for power hardware-in-the-loop grid charact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02M7/162H02M7/219H02M3/10G01R1/28G01R31/00
CPCY02E40/40
Inventor 周连俊应展烽彭子琦汪诚殷明慧彭云谢振华卜京陈载宇邹云
Owner NANJING UNIV OF SCI & TECH
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