A virtual synchronous generator fault ride-through control method

A technology of virtual synchronization and control method, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of complex fault control method and weak system stability.

Active Publication Date: 2020-06-26
合肥东徽欣能电气科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the above problems and provide a virtual synchronous generator fault ride-through control method to solve the problem of complex fault control method and stable system when the current loop and voltage loop are switched under the fault state of the existing virtual synchronous generator Technical problems such as weak sex

Method used

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  • A virtual synchronous generator fault ride-through control method
  • A virtual synchronous generator fault ride-through control method
  • A virtual synchronous generator fault ride-through control method

Examples

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Embodiment 1

[0067] see figure 1 , is the virtual synchronous generator topology in the embodiment of the present invention, including a DC source Udc, a DC side filter capacitor Cdc, a three-phase half-bridge inverter circuit, and an LC filter, and the DC side filter capacitor Cdc is connected in parallel to the DC source Udc At both ends, the two power output terminals of the DC source Udc are respectively connected to the two input terminals of the three-phase full-bridge inverter circuit, and the three-phase output terminals of the three-phase full-bridge inverter circuit are connected to the three-phase input terminals of the LC filter. One-to-one connection, the three-phase output terminals of the LC filter are respectively connected to the delta side of the Dyn11 transformer, the star side of the transformer is connected to the three-phase power grid Ea, Eb, Ec, the effective value of the phase voltage of the power grid is E, and Lg is three The inductance corresponding to the induc...

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Abstract

The present invention relates to a fault ride-through control method of a virtual synchronous generator, and relates to the technical field of virtual synchronous generators. The method employs a fault state determination link having a return difference feature and a wave-by-wave current limiting control module to finally generate PWM modulation signals Ua*, Ub* and Uc* of a switch tube to allow switching of a current loop and a voltage loop to be not required when faults are operated so as to ensure the control continuity of a control loop. The rapidity of the wave-by-wave current limiting and an outer loop instruction switching control scheme are combined to suppress a transient overcurrent and guarantee the voltage and current waveform instructions in the fault process.

Description

technical field [0001] The invention belongs to the technical field of virtual synchronous generators, and in particular relates to a virtual synchronous generator fault ride-through control method. Background technique [0002] In the traditional power system, the synchronous generating set plays a key role in maintaining the stability of the system under faults due to its strong overload capacity and large moment of inertia. A power electronic power supply device that can simulate or partially simulate Genset frequency and voltage control characteristics is called a virtual synchronous generator (Virtual Synchronous Generator, VSG). However, compared with the traditional synchronous generator set, the power electronic device based on VSG technology has weaker over-current capability and lacks inertia. Therefore, with the widespread application of distributed power sources interfaced with power electronic devices in power grid systems, the stability problem under fault con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/48H02J3/50H02J3/42
Inventor 钮小雨姜影
Owner 合肥东徽欣能电气科技有限公司
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