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Active damper which can improve the stability of grid-connected inverter system and regulate the power

A technology of system stability and power regulation, applied in single-network parallel feeding arrangements, harmonic reduction devices, wind power generation, etc., can solve problems such as weak suppression of high-frequency resonance and increased complexity of inverter control algorithms, etc. Achieve the effects of improving stability, increasing computing burden, and good compatibility

Active Publication Date: 2019-01-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Application Information

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Problems solved by technology

On the one hand, this increases the complexity of the control algorithm of each inverter in the system; on the other hand, due to the influence of digital control delay, these methods have relatively weak suppression of high-frequency resonance

Method used

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  • Active damper which can improve the stability of grid-connected inverter system and regulate the power
  • Active damper which can improve the stability of grid-connected inverter system and regulate the power
  • Active damper which can improve the stability of grid-connected inverter system and regulate the power

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Embodiment

[0086] An application example of the present invention is given below.

[0087] Such as Figure 7 As shown, the inverter 17 and the active damper are connected to the weak grid 18 together with the PCC to form a grid-connected system, and their parameters are shown in Table 1 and Table 2 respectively. Grid line impedance Z g It is purely inductive, and the inductive value is 1000μH.

[0088] The waveform diagram of this specific embodiment is as Figure 8 As shown, from top to bottom are three-phase PCC voltage waveform, inverter three-phase grid-connected current waveform, active damper grid-connected current waveform and active damper adaptive impedance admittance waveform.

[0089] When the active damper works alone, the grid-connected system is stable, and the active damper does not need virtual impedance to stabilize the system, but only needs to feed energy to the grid according to the requirements of active power and reactive power. But when the inverter is cut in, ...

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Abstract

The invention provides an active damper which improves the stability of the inverter grid-connected system and can be adjusted in power, the active damper is connected in parallel with a plurality ofinverter grid-connected systems at a common coupling point, comprises a power output circuit and a control circuit, A power output circuit outputs a three-phase grid-connected current, the control circuit detects the three-phase PCC voltage, The harmonic content in the target frequency range is extracted, and the active damper is made to simulate the resistance characteristics in the control bandwidth by the feed-forward compensation unit in the static coordinate system, so as to damp the oscillation caused by the instability in the grid-connected inverter system and improve the stability of the whole system. At the same time, the active power and reactive power of the grid-connected current are controlled directly in the synchronous coordinate system. The active damper can stabilize the system quickly and effectively when the grid-connected system is unstable while the active power and reactive power are controlled, and it also has good damping effect for the case of multiple resonance points simultaneously.

Description

technical field [0001] The invention relates to an active damper for improving the stability of a three-phase inverter grid-connected system, in particular to an active damper for improving the stability of a three-phase inverter grid-connected system with active power and reactive power adjustment The active damper belongs to the field of new energy grid-connected power generation. Background technique [0002] In recent years, in order to cope with energy crisis and environmental pollution, renewable energy represented by wind energy and solar energy is being used more and more widely. Three-phase grid-connected inverters, as the interface between distributed renewable generation units and the grid, are becoming a research hotspot among scholars at home and abroad. [0003] In order to suppress the switching harmonics contained in the output voltage of the bridge arm of the grid-connected inverter, an LCL filter is usually used. However, the frequency response of the LCL...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/38Y02E40/40
Inventor 林志恒阮新波贾雷张昊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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