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Virtual synchronous generator power decoupling method based on virtual power of single rotation angle

A generator power and virtual power technology, which is applied in the direction of converting AC power input to DC power output, output power conversion device, wind power generation, etc., can solve problems such as weakening the coupling degree of inverter output power, and achieve dynamic and static protection. Stable, easy to implement, less sensitive effects

Active Publication Date: 2019-01-22
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0004] The present invention aims at the problem of power oscillation caused by the power coupling of the output power of the virtual synchronous generator during line transmission, and proposes a power decoupling method of the virtual synchronous generator based on the virtual power of a single rotation angle. It can weaken the coupling degree of the output power of the inverter when the system is connected to the medium and low voltage microgrid, thereby suppressing the oscillation of the output power, improving the dynamic and static stability of the entire inverter system, and ensuring its safe and reliable operation

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  • Virtual synchronous generator power decoupling method based on virtual power of single rotation angle
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  • Virtual synchronous generator power decoupling method based on virtual power of single rotation angle

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Embodiment Construction

[0038] like figure 1 It is a block diagram of the overall structure of the virtual synchronous generator power decoupling method based on the virtual power of a single rotation angle, including a DC voltage source, a high-frequency switching three-phase inverter, an LC filter, and a power detection for detecting the output power of the inverter Transmitter, virtual power calculation unit, virtual synchronous generator algorithm unit, detection transmitter used to detect inverter side current and filter capacitor voltage, convert three-phase current and voltage in three-phase stationary coordinate system into two The coordinate transformation unit of the two-phase current and voltage in the phase rotation coordinate system is used for coordinate transformation of the three-phase current on the inverter side and the three-phase voltage of the filter capacitor, and a double-loop control unit for controlling the reference voltage, and two One PI controller for regulating the volta...

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Abstract

The invention relates to a virtual synchronous generator power decoupling method based on single rotation angle virtual power. As a fixed rotation angle is adopted in the virtual power conversion, theimpedance angle of the output impedance of the inverter is not considered, the sensitivity to the output impedance is small, and the design is simple and easy to realize. The dynamic and static stability of the system is ensured by using the inertial structure of the virtual synchronous generator algorithm to solve the weak decoupling problem caused by the fixed rotation angle. The invention hasthe advantages of high control accuracy, good tracking effect, effective suppression of power oscillation, damping support for power grid and the like, and is suitable for connecting new energy sources such as solar power generation, wind power and the like into a medium-low voltage microgrid. The method can weaken the coupling degree of the output power of the inverter when the system is connected to the medium-low voltage microgrid, thereby restraining the oscillation of the output power, improving the dynamic and static stability of the whole inverter system, and ensuring the safe and reliable operation of the inverter system.

Description

technical field [0001] The invention relates to an inverter control technology, in particular to a power decoupling method of a virtual synchronous generator based on virtual power of a single rotation angle. Background technique [0002] Grid-connected inverters have been widely used as the interface between distributed power generation and the grid. Since power electronic equipment cannot provide the required inertia and damping for the grid, with the continuous improvement of the penetration rate of distributed power generation, the power grid The inertia and damping are seriously insufficient, and the stability is reduced. Virtual synchronous generator technology simulates the operating characteristics of synchronous generators, provides inertia and damping for the grid, and becomes an effective way to solve this problem. [0003] Virtual synchronous generator technology imitates the characteristics of primary frequency regulation and primary voltage regulation of synch...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/5387
CPCH02J3/38H02M7/5387Y02E10/76
Inventor 杨旭红陈昊张云飞刘洋姚凤军陆浩郝鹏飞宋兴龙
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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