Energy-saving device and method capable of feeding back electric energy to power grid from parallel connection

An energy-saving device and grid voltage technology, applied in the field of power electronics, can solve problems such as the inability to feed back the electric energy of the crane to the grid, and achieve the effect of flexible combination

Inactive Publication Date: 2012-09-19
大连美恒电气有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an energy-saving device capable of self-parallel feeding back electric energy to t

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  • Energy-saving device and method capable of feeding back electric energy to power grid from parallel connection
  • Energy-saving device and method capable of feeding back electric energy to power grid from parallel connection
  • Energy-saving device and method capable of feeding back electric energy to power grid from parallel connection

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[0035] The invention provides an energy-saving device capable of self-paralleling and feeding back electric energy to the grid, figure 1 It is a schematic structural diagram of the energy-saving device capable of self-paralleling and feeding back electric energy to the grid of the present invention. As shown in the figure, the device includes an AC contactor, a DC bus voltage detection unit, a first comparator, a DC bus signal acquisition unit, a power grid signal acquisition unit, a second comparator, an output current feedback signal acquisition unit, and a third comparator. Converter, drive circuit and inverter unit. The voltage detection unit is used to detect the voltage of the inverter's DC bus, and send the detected voltage to the first comparator to compare and determine with the given voltage value. When the conditions are met, it sends a signal to the AC contactor to connect to the power grid. At the same time, the compared difference is sent to the DC bus signal acqu...

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Abstract

The invention provides an energy-saving device capable of feeding back electric energy to a power grid from parallel connection. The device adopts double closed-loop control of a direct current bus voltage control loop and a feedback current control loop, and adjusts the size of feedback current according to output of the direct current bus voltage control loop. The invention also provides an energy-saving method capable of feeding back electric energy to the power grid from parallel connection. By implementation of the energy-saving device and the method disclosed by the invention, the beneficial effects are that: firstly, double closed-loop control of the direct current bus voltage control loop and the feedback current control loop are adopted, and the size of the feedback current is adjusted according to the output of the direct current bus voltage control loop so as to ensure that no effect on the power grid is generated while feeding back electric energy to the power grid, and secondly, field application and field combination are flexible, one energy-saving device is connected between the power grid and one or more transducers to achieve electric energy feedback on the occasion of low power, and a plurality of energy-saving devices are connected between the power grid and one or more transducers to achieve electric energy feedback.

Description

technical field [0001] The present invention relates to the technical field of power electronics, and more specifically relates to an energy-saving device and method capable of self-parallel feeding back electric energy to a power grid. Background technique [0002] A crane is an electromechanical device that places heavy objects by vertical lifting or vertical lifting and horizontal movement. With the continuous development of technology, in order to ensure the safe and stable operation of cranes, the demand for speed control accuracy is increasing. At present, more and more on-site control uses frequency converters to control motor operation. However, there will be a problem when using frequency converter control. When the heavy load is lowered, its load position can be converted into electrical energy through the motor and stored in the DC capacitor, and the converted electrical energy will be stored in the DC capacitor when the crane brakes. It will cause the voltage of...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 滕波
Owner 大连美恒电气有限公司
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