Grid connected inverter power distributing method based on virtual synchronous control

A technology of virtual synchronization and distribution method, applied in reactive power adjustment/elimination/compensation, reactive power compensation, single-grid parallel feeding arrangement, etc. Power proportional distribution and other issues

Active Publication Date: 2017-01-18
HUNAN UNIV
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Problems solved by technology

However, the realization of this power distribution method depends on the large enough capacity of the grid-connected inverter
When the capacity of the grid-connected inverter is insufficient, the proportional distribution of power cannot be realized, and the performance of the system will deteriorate
Although the virtual synchronous generator technology that further simulates the characteristics of synchronous motors on the basis of droop control can make the transient process of the grid-connected inverter power slower and can effectively improve the stability of the system, it is also affected by the grid-connected inverter. capacity limitation

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  • Grid connected inverter power distributing method based on virtual synchronous control
  • Grid connected inverter power distributing method based on virtual synchronous control
  • Grid connected inverter power distributing method based on virtual synchronous control

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Embodiment Construction

[0043] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0044] figure 1 Load model diagram, the generator is connected to node 1, the main load is connected to node 2, the rest of the load is connected to node 3, the grid-connected inverter is connected to node 2, the capacity of the grid-connected inverter is 0.6MVA, and the capacity of the generator is 10MVA , the short-circuit capacity is 100MVA, the generator port line voltage is 380V, the grid-connected inverter is connected to node 3, the load of node 3 is 0.816MW+j0.0816MVar, and the transmission line impedance between node 1 and node 3 is 0.00125+j0 .0079.

[0045] figure 2 It is...

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Abstract

The invention provides a grid connected inverter power distributing method based on virtual synchronous control to mainly solve the problem that the classical droop control strategy can not effectively improve the stability of a system when the voltage and frequency of the grid fluctuate greatly and the capacity of an inverter is insufficient. A constant-speed regulation mode is employed by taking into account the frequency instability and voltage instability of the power grid, so that the speed of frequency and voltage instability trend is consistent. Excessively fast voltage instability due to excessive inverter active power compensation and excessively fast frequency instability due to excessive reactive compensation can be prevented, thereby prolonging the relative time length of power grid instability. Compared with a classic control method, the control method can effective improve the stability of a power grid, and ensure safety and stability of the power grid.

Description

technical field [0001] The patent of the invention belongs to the field of flexible direct current transmission, and in particular relates to a method for power distribution of grid-connected inverters based on virtual synchronous control. Background technique [0002] Flexible DC transmission technology is an effective way to build a flexible, strong and efficient power grid and make full use of renewable energy. It represents the future development direction of DC transmission and has become one of the key technologies of the new generation of smart grid. [0003] The most important outer-loop controls of grid-connected inverters are: power control, constant voltage-frequency control and virtual synchronous control; different outer-loop control methods correspond to different power distribution methods of grid-connected inverters. Although the power control method can realize the tracking of the output power to the preset power, it does not consider how to optimize the act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/46H02J3/48H02J3/50H02J3/18
CPCY02E40/30H02J3/46H02J3/18H02J3/48H02J3/50
Inventor 荣飞黄韬龚喜长黄守道尹章涛李文君
Owner HUNAN UNIV
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