Parallelable large energy feedback device electricity-saving device
An energy feedback and power saving device technology, applied in the field of motor energy saving, can solve the problems of the limited capacity of the energy feedback device, the influence of heat dissipation and stability of the device, and the difficulty of single machine implementation, and achieves high reliability, good current sharing effect, Responsive effect
Active Publication Date: 2013-10-23
万洲电气股份有限公司
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Problems solved by technology
However, it is more difficult to implement a single machine, because as the power level increases, the reactor and IGBT need to bear more current, and the heat dissipation and stability of the device are affected. In order to solve the problem of limited capacity of the energy feedback device, the present invention A method of paralleling energy to realize energy feedback expansion is proposed to meet the application occasions with large demand for feedback power
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[0025] The large-scale energy feedback device of the present invention can be connected in parallel and the power saving device can operate independently or in parallel with current equalization.
[0026] Such as figure 1 shown. The energy-saving device (control part) that can be connected in parallel with a large-scale energy feedback device includes: a three-phase inverter bridge, an LC three-phase filter circuit, and a control circuit. The three-phase inverter bridge consists of 6 IGBT modules V1, V2, V3, V4, V5, V6, and a set of capacitor modules C1, C2. The LC three-phase filter circuit consists of three-phase reactors La, Lb, Lc and filter capacitors Composition, connection methods such as figure 1 The connection method of the conventional circuit shown is that the three-phase DC side is connected with the DC bus P of the inverter through the diode VD1, the three-phase DC side is connected with N through the diode VD2, and the AC output side of the three-phase inverter...
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The invention provides a parallelable large energy feedback device electricity-saving device, and belongs to the energy-saving technical field of motors. The invention mainly solves the problem that the existing energy feedback device is very difficult to be applied to large-power occasions. The electricity-saving device is mainly characterized by comprising a module and a control circuit, wherein the module is formed by a three-phase inverter bridge and an LC three-phase filter circuit, the direct current side end of the three-phase inverter bridge is used for being connected with a direct current bus of a converter, an alternating current output side of the three-phase inverter bridge is connected with an electric reactor which is arranged in the LC filter circuit and is not connected with a capacitor, the other end of the electric reactor is used for being connected with a three-phase power grid, the control circuit is formed by a sampling circuit and a DSP (Digital Signal Processor), the output end of the DSP is respectively connected with the control end of the three-phase inverter bridge. With the adoption of the device provided by the invention, direct current electric energy generated by motor brake can be converted into alternating current to be fed back to the power grid, the respond speed is high, the current sharing effect is good, and the reliability is high, and the device is mainly used on the large brake electric energy occasions such as motors of belt conveyors, centrifugal machines and hoisters.
Description
technical field [0001] The invention belongs to the technical field of motor energy saving, in particular a parallel-connectable large-scale energy feedback device energy-saving device combined with a frequency converter and used in the occasions where the braking electric energy of belt conveyors, centrifuges, hoist motors, etc. is relatively large. Background technique [0002] The energy problem is a prominent issue that determines the social development in the new century. How to improve the utilization rate of energy has attracted the attention of people all over the world. The energy feedback type active inverter, as the access to the power grid, can realize the conversion of direct current and alternating current, and has broad application prospects. The power feedback system can invert the energy of the capacitor in the frequency converter into a current that is in phase with the grid voltage and return it to the grid. While reusing mechanical energy, it reduces the...
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IPC IPC(8): H02J3/38
Inventor 赵世运邓福能林武生
Owner 万洲电气股份有限公司