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Series compensation power grid resonance suppression method based on virtual synchronous generator

A technology of virtual synchronization and resonance suppression, which is applied in the direction of single-network parallel feed arrangement, reduction/prevention of power oscillation, etc., can solve problems such as unstable access to series-compensated power grids, and achieve improved system stability, simple control structure, and improved The effect of the stability margin

Active Publication Date: 2020-04-17
HEFEI UNIV OF TECH
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Problems solved by technology

The present invention proposes a series compensation grid resonance suppression method based on a virtual synchronous generator. By introducing the proportional feedback of the filter inductor current inside the inverter in the wave generation link controlled by the virtual synchronous generator without an inner loop, the virtual resistance is realized, and then Solve the unstable problem of virtual synchronous generator connected to series compensated grid

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  • Series compensation power grid resonance suppression method based on virtual synchronous generator
  • Series compensation power grid resonance suppression method based on virtual synchronous generator
  • Series compensation power grid resonance suppression method based on virtual synchronous generator

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Embodiment Construction

[0064] The present embodiment will be specifically described below in conjunction with the accompanying drawings.

[0065] figure 1 It is a grid-connected topological structure diagram of a virtual synchronous generator related to the present invention. . It can be seen from the figure, including the DC side power supply V dc , DC side filter capacitor C in , Grid-connected inverter, LC filter, series compensation circuit and power grid. The DC side power supply and the DC side filter capacitor C in Parallel connection, DC side filter capacitor C in It is connected in parallel with the grid-connected inverter, and the output of the grid-connected inverter is filtered by an LC filter and then connected to the grid through a series compensation circuit. The capacitance and inductance in the LC filter are denoted as inverter-side filter capacitor and inverter-side filter inductance, respectively. exist figure 1 in, V dc is the DC voltage source voltage, L f is the inver...

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Abstract

The invention discloses a series compensation power grid resonance suppression method based on a virtual synchronous generator. A grid-connected topological structure of the virtual synchronous generator applying a control method comprises a direct-current side power supply, a direct-current side filter capacitor Cin, a grid-connected inverter, an LC filter, a series compensation capacitor, a lineinductor and a power grid. According to the control structure of the inverter, filter inductor current proportion feedback on an inner side of the inverter is introduced under a three-phase coordinate system before a wave sending link of an inner-loop-free virtual synchronous machine structure so as to realize virtual resistance; therefore, the problem of instability when the virtual synchronousmachine is connected to a series compensation power grid is solved, the grid-connected stability is remarkably improved, and the economy and reliability of new energy power generation are improved.

Description

technical field [0001] The invention belongs to the technical field of distributed power generation and power electronics, and in particular relates to a method for suppressing resonance of a series-compensated power grid based on a virtual synchronous generator. Background technique [0002] As the penetration rate of new energy power generation increases, the stability of grid-connected inverters connected to the public grid has received widespread attention. The traditional current-controlled inverter has gained wide advantages due to its simple control structure, quick MPPT, and cost-effectiveness. However, when the current-controlled inverter is connected to the grid on a large scale, it is easy to cause instability problems. Therefore, the virtual synchronous machine technology came into being. [0003] Virtual synchronous machine technology can simulate the damping and inertia of traditional synchronous generators, and provide frequency and voltage support for the gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24
Inventor 张兴王杨郭梓暄潘海龙高倩王继磊谢震刘晓玺陈巧地
Owner HEFEI UNIV OF TECH
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