Networking and off-network uniform control method of energy storage inverter

A technology of energy storage inverter and control method, applied in the direction of single-grid parallel feeding arrangement, etc., can solve the problems of system shock, unable to achieve smooth switching, affecting the reliability of power supply, and achieve automatic smooth switching and ensure reliability. Effect

Inactive Publication Date: 2015-09-30
ZHUHAI XJ ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the system switches between grid-connected and off-grid states, since the inverter uses two different control loops, smooth switching cannot be achieved, which will impact the system and affect the reliability of power supply. Taking Distributed Power Off the Grid

Method used

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  • Networking and off-network uniform control method of energy storage inverter
  • Networking and off-network uniform control method of energy storage inverter

Examples

Experimental program
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Embodiment Construction

[0021] The invention relates to a unified control method for paralleling and off-grid of an energy storage inverter, which can realize the state of paralleling and off-grid and automatic smooth switching therebetween.

[0022] Refer to attached figure 1 , the control system is composed of energy storage inverter, key load, inverter grid-connected switch Si, grid power distribution switch Sg, grid and phase-locked loop. The system adopts unbalanced phase-locked, and the collected grid voltage vg is The phase loop obtains the phase-locked angle q, and the grid-connected voltage and current of the inverter are separated and transformed by positive and negative sequences to obtain voltage positive sequence components Vd+_fdb, Vq+_fdb and current positive sequence components Id+_fdb, Iq+_fdb, negative sequence components Id-_fdb, Iq-_fdb, and then through the positive and negative sequence separation control in the synchronous coordinate system to obtain the PWM wave to control the...

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Abstract

The invention discloses a networking and off-network uniform control method of an energy storage inverter. According to the method, a control system is adopted; when the inverter is in a networking/off-network state, the control system adopts voltage and current dual-loop control, the outer loop is a voltage outer loop, an inner loop is a current inner loop, the inner and outer loops adopt PI control, the voltage outer loop is in a saturation/desaturation state, so that the inverter works in a current source mode/voltage source model; when in a state between a networking state and an off-network state, the inverter can be seamlessly switched between the two working states. The networking and off-network uniform control method of the energy storage inverter provided by the invention is capable of realizing automatic and smooth switching among the networking state, the off-network state and the state between the networking state and the off-network state.

Description

technical field [0001] The invention relates to the field of microgrids or distributed power generation systems, in particular to a method for unified control of energy storage inverters connected to and off the grid. Background technique [0002] With the development of distributed power generation technology, the traditional centralized power generation system is transforming into a distributed power generation system. The distributed power generation system is close to the load, and the power supply reliability is high. It can supply power to remote mountainous areas or commercial areas, reducing transmission loss. It has effectively alleviated my country's energy problems and improved the reliability of power supply. [0003] The distributed power generation system is mainly composed of distributed power sources, energy storage devices, loads and power grids. Because the energy storage inverter has the function of peak-shaving and valley-filling, it has been widely use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 郭上华张维曹奇
Owner ZHUHAI XJ ELECTRIC
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