Capacitor voltage feedforward control method of grid-connected inverter under weak power grid

A technology of capacitor voltage and feed-forward control, which is applied in the direction of single-network parallel feeding arrangement, AC network to reduce harmonic/ripple, harmonic reduction device, etc. Implementation, increasing the number of sensors, etc.

Active Publication Date: 2020-06-05
HENAN POLYTECHNIC UNIV
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Problems solved by technology

However, limiting the resonant frequency will lead to problems such as too slow dynamic response
To avoid this problem, it is necessary to add an additional damping link to ensure the stability of the system, but the traditional active damping will increase the number of sensors and the capacitance-voltage damping approximation link is difficult to achieve in engineering
In addition, the current feedback control strategy on the inverter side has the advantages of small dist

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  • Capacitor voltage feedforward control method of grid-connected inverter under weak power grid
  • Capacitor voltage feedforward control method of grid-connected inverter under weak power grid
  • Capacitor voltage feedforward control method of grid-connected inverter under weak power grid

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[0094]Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

[0095] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should ...

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Abstract

The invention relates to a capacitor voltage feedforward control method of a grid-connected inverter under a weak power grid. The method belongs to the field of grid-connected inverter control, and comprises the following steps: S1, performing feedback control by using inverter side current i1, and performing phase locking, active damping and feedforward compensation by using capacitor voltage uCto obtain a capacitor voltage feedforward control system of a grid-connected inverter under a weak power grid; S2, performing active damping negative feedback design under a weak power grid on the capacitor voltage feedforward control system obtained in the step S1; and S3, on the basis of the step S2, designing a capacitor voltage feedforward compensation control strategy for the capacitor voltage feedforward control system. On the premise of ensuring the performance of the control system, the use of voltage and current sensors is reduced, and the hardware cost of the system is reduced; and the dynamic performance and stability of the control system are improved, so that the grid-connected inverter always has enough stability margin under the characteristic that the impedance of the powergrid changes in a relatively wide range.

Description

technical field [0001] The invention belongs to the field of grid-connected inverter control, and relates to a method for feedforward control of the capacitor voltage of a grid-connected inverter under a weak grid. Background technique [0002] Grid-connected inverter, as the core device connecting the new energy power generation system to the grid, is related to the stable operation of the power system. When the transmission and distribution lines are long and there are many isolation transformers in the regional power grid, the power grid is prone to appear a weak power grid characterized by "low short-circuit ratio". If the grid-connected inverter is connected to a weak grid, it is easy to cause stability problems such as excessive harmonic content of the grid-connected current. [0003] In order to solve the stability problem, the existing literature has proposed many schemes to improve the stability, including adding compensation links in the current loop, optimizing t...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/38H02J3/01Y02E40/40
Inventor 杨明鲍靖雯韦延方孙岩洲
Owner HENAN POLYTECHNIC UNIV
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