Control method of inverter parallel system based on secondary frequency modulation and virtual synchronous generator algorithm

A technology of secondary frequency modulation and control method, applied in the field of micro-grid, can solve the problems of parallel instantaneous voltage and current sag oscillation power distribution, low power supply voltage quality, unevenness, etc. Eliminate the effect of voltage sag

Active Publication Date: 2018-12-25
JIANGSU UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a control method for an inverter parallel system based on secondary frequency modulation and a virtual synchronous generator algorithm, using a three-phase three-wire inverter parallel topology and a virtual synchronous generator Combined with the pre-synchronization control unit for parallel operation and the secondary frequency modulation principle of virtual synch

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  • Control method of inverter parallel system based on secondary frequency modulation and virtual synchronous generator algorithm
  • Control method of inverter parallel system based on secondary frequency modulation and virtual synchronous generator algorithm
  • Control method of inverter parallel system based on secondary frequency modulation and virtual synchronous generator algorithm

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Example Embodiment

[0048] Embodiment 1. A control method of inverter parallel system based on secondary frequency modulation and virtual synchronous generator algorithm. Combine below Figure 1 to Figure 8 The method provided in this embodiment is described in detail.

[0049] See Figure 1 to Figure 8 , The present invention adopts the control method of inverter parallel system based on secondary frequency modulation and virtual synchronous generator algorithm, which solves the problem of voltage and current drop and oscillation at the moment of parallel load load, and realizes that the output power of parallel system is equally divided according to rated capacity. , Effectively reducing the system circulation. The method includes: S1, adopting a separate and independent sampling method to collect the frequencies of two parallel virtual synchronous generators; at the same time, using an amplitude calculation module to calculate the output voltage and current amplitudes of the two virtual synchrono...

Example Embodiment

[0115] Embodiment 2. A control method of inverter parallel system based on secondary frequency modulation and virtual synchronous generator algorithm. Combine below Figure 2 to Figure 8 The system provided in this embodiment will be described in detail.

[0116] See Figure 2 to Figure 8 , A control method of inverter parallel system based on secondary frequency modulation and virtual synchronous generator algorithm, characterized in that the system includes a frequency sampling module, an amplitude calculation module, a virtual synchronous generator control module, and a secondary Frequency modulation module, pulse signal generation module and pre-synchronization control module.

[0117] Frequency sampling module, used to collect the frequency of two parallel virtual synchronous generators by means of separate and independent sampling.

[0118] Specifically, the frequency sampling module is specifically used to: adopt a microgrid central controller, that is, a frequency sampling...

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Abstract

The invention discloses a control method of an inverter parallel system based on secondary frequency modulation and a virtual identical generator algorithm. The invention adopts the topology structureof three-phase three-wire inverters running in parallel, and by using the control algorithm of two virtual synchronous generators and the pre-synchronization control unit in parallel running of the inverters and using the secondary frequency modulation principle of the virtual synchronous generators, the pre-synchronization control and power equalization of the inverter parallel system are finally realized. The invention solves the problems of low supply voltage quality, voltage and current transient sag oscillation and uneven power distribution when the prior conventional inverter parallel system is loaded, effectively improves the operation stability and capacity when the microgrid is loaded, and strengthens the ability of stable operation when the distributed power supply is loaded inparallel.

Description

technical field [0001] The invention belongs to the technical field of micro-grids, and relates to a control method for an inverter parallel system based on secondary frequency modulation and a virtual synchronous generator algorithm. Background technique [0002] In recent years, with the advantages of miniature, clean, autonomous and friendly microgrids, the country has increased investment in the construction of microgrids, making microgrid technology a research hotspot. Among many micro-grid control technologies, the control of distributed inverter units is the most important. Therefore, some literatures have proposed virtual synchronous generator technology, which enables distributed inverter power to simulate the operating characteristics of synchronous generators, and improves the acceptance capacity of large power grids for micro-sources. The parallel operation of VSG (Virtual Synchronous Generator) improves the capacity of the microgrid. If one of them fails and ex...

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Application Information

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IPC IPC(8): H02J3/40
CPCH02J3/40
Inventor 孙宇新陈诚施凯徐培凤刘奕辰谭斐
Owner JIANGSU UNIV
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