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Impedance adapter used for stabilizing multiple inverter grid-connected system

An inverter and adapter technology, applied in the field of new energy grid-connected power generation, can solve the problems of increasing the complexity of the inverter control algorithm, weak high-frequency resonance suppression effect, etc.

Active Publication Date: 2016-12-21
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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  • Impedance adapter used for stabilizing multiple inverter grid-connected system
  • Impedance adapter used for stabilizing multiple inverter grid-connected system
  • Impedance adapter used for stabilizing multiple inverter grid-connected system

Examples

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Embodiment Construction

[0051] The specific implementation manner thereof will be described below.

[0052] Such as figure 1 , the impedance adapter used to stabilize the grid-connected system of multiple inverters in this embodiment is connected in parallel with the grid-connected system of multiple inverters at a point of common coupling (Point of Common Coupling, PCC). The impedance adapter is mainly composed of a power output circuit and a control circuit. Power output circuit output DC side capacitor voltage V dc and grid current i g ; The control circuit detects the PCC voltage v pcc , the phase θ is obtained through the phase-locked loop unit, and the DC side capacitor voltage V is measured through the voltage outer loop unit and the current inner loop unit respectively. dc and grid current i g Perform closed-loop control, and at the same time, correct the output impedance characteristics of the impedance adapter by introducing a PCC voltage feedforward unit. Through the power output cir...

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Abstract

The invention provides an impedance adapter used for stabilizing a multiple inverter grid-connected system. The impedance adapter is parallelly connected with the multiple inverter grid-connected system at a point of common coupling, and comprises a power output circuit and a control circuit, wherein the power output circuit outputs a DC side capacitance voltage V<dc> and a grid-connected current i<g>; and the control circuit detects a PCC voltage v<pcc>, acquires a phase position theta by means of a phase-locked loop unit, performs closed-loop control on the DC side capacitance voltage V<dc> by means of a voltage outer loop unit, performs closed-loop control on the grid-connected current i<g> by means of a current inner loop unit, and corrects output impedance characteristics of the impedance adapter by introducing a PCC voltage feedforward unit. The impedance adapter has the beneficial effects that the impedance adapter is less affected by digital control delay, can stabilize the system quickly and effectively, and has good stabilizing effect on the occurrence of a plurality of resonance points without changing control methods of each inverter in the system as well as software and hardware parameters.

Description

technical field [0001] The invention relates to the field of new energy grid-connected power generation, in particular to an impedance adapter for stabilizing a grid-connected system of multiple inverters. Background technique [0002] In recent years, in order to deal with environmental pollution and energy shortage, renewable energy represented by wind energy and solar energy has attracted more and more attention. As the interface between the renewable power generation unit and the grid, the grid-connected inverter has always been a research hotspot of 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 filter contains resonant spikes that may affect system stability. At present, the damping method of the resonance peak of the LCL filter and the design method of the inverter control para...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/38
Inventor 贾雷阮新波杨东升赵文心
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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