CN221353934U - Three-phase unbalance treatment circuit - Google Patents
Three-phase unbalance treatment circuit Download PDFInfo
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- CN221353934U CN221353934U CN202323175260.6U CN202323175260U CN221353934U CN 221353934 U CN221353934 U CN 221353934U CN 202323175260 U CN202323175260 U CN 202323175260U CN 221353934 U CN221353934 U CN 221353934U
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- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 230000005611 electricity Effects 0.000 claims abstract description 8
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The utility model discloses a three-phase unbalance management circuit, which belongs to the field of electricity and comprises IBCT drives for driving a first IGBT tube group, a second IGBT tube group and a third IGBT tube group, wherein the first IGBT tube group, the second IGBT tube group, the third IGBT tube group and a capacitor group form a parallel circuit; the first IGBT tube group comprises a first IGBT tube and a fourth IGBT tube, and the first IGBT tube is connected with the fourth IGBT tube in series; the second IGBT tube group comprises a second IGBT tube and a fifth IGBT tube, and the second IGBT tube is connected with the fifth IGBT tube in series; through using IGBT drive circuit to drive the IGBT pipe and carry out the switching action, can realize the real-time supervision and control to three-phase current, when finding that three-phase current is unbalanced, the device can automatic calculation need the current value of adjustment to realize the redistribution of electric current through the on-off state of control IGBT pipe, this kind of design can solve the unbalanced problem of three-phase fast, accurately, high-efficient, simultaneously also can protect electric power system and relevant equipment effectively, improves its stability and reliability.
Description
Technical Field
The utility model belongs to the technical field of electricity, and particularly relates to a three-phase imbalance treatment circuit.
Background
With the development of economy, the contradiction between the load demand and the relatively slow power quality optimization on the side close to each other is increasingly prominent, the current problems are mainly represented by the voltage and current quality problems of the distribution network, the voltage problems are mainly represented by voltage sag, the current problems are mainly represented by unbalanced load, and the three-phase current imbalance, heavy current, harmonic interference and reactive power problems are caused.
The three-phase current imbalance problem causes the following effects: when the three-phase load is in unbalanced operation, the neutral line passes current, so that not only the phase line is lost, but also the neutral line is lost, thereby increasing the loss of a power grid line, the distribution transformer is a power supply main device of a low-voltage power grid, the power loss of the distribution transformer is changed along with the unbalanced degree of the load, and when the three-phase load is in operation under the unbalanced working condition of the three-phase load, the distribution transformer loss is increased; the distribution transformer operates under the unbalanced working condition of the three-phase load, zero-sequence current is generated, the current changes along with the unbalanced degree of the three-phase load, the greater the unbalanced degree is, the greater the zero-sequence current is, the local temperature of a steel component of the distribution transformer is increased to generate heat, the insulation of a winding of the distribution transformer is accelerated to age due to overheating, and the service life of equipment is reduced.
Disclosure of utility model
The utility model aims to provide a three-phase unbalance management circuit for solving the problem of three-phase current unbalance.
In order to achieve the above purpose, the present utility model provides the following technical solutions: a three-phase unbalance management circuit comprises IBCT drives for driving a first IGBT tube group, a second IGBT tube group and a third IGBT tube group, wherein the first IGBT tube group, the second IGBT tube group, the third IGBT tube group and a capacitor group form a parallel circuit;
The first IGBT tube group comprises a first IGBT tube and a fourth IGBT tube, and the first IGBT tube is connected with the fourth IGBT tube in series;
the second IGBT tube group comprises a second IGBT tube and a fifth IGBT tube, and the second IGBT tube is connected with the fifth IGBT tube in series;
The third IGBT tube group comprises a third IGBT tube and a sixth IGBT tube, and the third IGBT tube is connected with the sixth IGBT tube in series.
Further, one side that IGBT tube No. one and IGBT tube No. four are close each other is connected with a phase line electricity, one side that IGBT tube No. two and IGBT tube No. five are close each other is connected with b phase line electricity, one side that IGBT tube No. three and IGBT tube No. six are close each other is connected with c phase line electricity.
Furthermore, the capacitor group is formed by connecting two capacitors in series.
Further, the IBCT driver is electrically connected with a controller.
Further, the controller is electrically connected with a current transformer, and the current transformer collects three-phase current data.
Further, two sides of the capacitors, which are close to each other, are connected with a ground wire.
Compared with the prior art, the utility model has the beneficial effects that:
according to the three-phase unbalance management circuit, the IGBT driving circuit is used for driving the IGBT tube to conduct switching action, real-time monitoring and control of three-phase current can be achieved, when three-phase current unbalance is found, the device can automatically calculate a current value to be adjusted, and current redistribution is achieved through controlling the switching state of the IGBT tube.
Drawings
FIG. 1 is a circuit diagram of a three-phase imbalance remediation circuit;
FIG. 2 is a graph of data before and after use of the three-phase imbalance management circuit.
In the figure: 1. a first IGBT tube; 2. a second IGBT tube; 3. a third IGBT tube; 4. a fourth IGBT tube; 5. a fifth IGBT tube; 6. and a sixth IGBT tube.
Detailed Description
The utility model is further described below with reference to examples.
The following examples are illustrative of the present utility model but are not intended to limit the scope of the utility model. The conditions in the examples can be further adjusted according to specific conditions, and simple modifications of the method of the utility model under the premise of the conception of the utility model are all within the scope of the utility model as claimed.
Referring to fig. 1 and 2, the present utility model provides a three-phase imbalance treatment circuit, which includes a parallel circuit of a first IGBT stack, a second IGBT stack, a third IGBT stack, and a capacitor stack.
The first IGBT tube group comprises a first IGBT tube 1 and a fourth IGBT tube 4, the first IGBT tube 1 is connected with the fourth IGBT tube 4 in series, and one side, close to the fourth IGBT tube 4, of the first IGBT tube 1 is electrically connected with the a-phase line through an inductor.
The second IGBT tube group comprises a second IGBT tube 2 and a fifth IGBT tube 5, the second IGBT tube 2 is connected with the fifth IGBT tube 5 in series, and one side, close to the fifth IGBT tube 5, of the second IGBT tube 2 is electrically connected with the b phase line through an inductor.
The third IGBT tube group comprises a third IGBT tube 3 and a sixth IGBT tube 6, the third IGBT tube 3 is connected with the sixth IGBT tube 6 in series, and one side, close to the third IGBT tube 3 and the sixth IGBT tube 6, of the third IGBT tube group is electrically connected with the c phase line through an inductor.
The capacitor group is formed by connecting two capacitors in series, and the capacitors are direct current bus capacitors and play a role in controlling the voltage of the direct current bus.
The current transformer is externally connected with one side of the power grid, which is close to the load, and is used for detecting the system current in real time, the output end of the current transformer is electrically connected with the receiving end of the controller, and the output end of the controller is electrically connected with the driving receiving end, so that the magnitude and the direction of the current of each phase can be flexibly adjusted, and the flexible distribution and balance control of the current are realized; after the controller calculates the current value to be adjusted according to the information of the current transformer, the controller sends a corresponding signal to the IGBT driving circuit. The IGBT driving circuit drives the IGBT tube to perform switching action according to the signals, so that the flow direction and the magnitude of current are changed.
The working principle and the using flow of the utility model are as follows: when the device is operated, the system current is detected in real time through the external current transformer, then the current information acquired by the current transformer is sent to the internal controller for processing, after the analysis of the controller, the device can find the current unbalance state of the system, and meanwhile, the current value required to be converted when the three-phase current reaches the balance state is calculated.
Referring to fig. 1, it is assumed that the three-phase currents a, b and c are 5A, 10A and 15A, respectively, the current of 5A needs to be increased when the phase a current is about to reach an equilibrium state, the phase b current is just 10A and does not need to be adjusted, the current of 5A needs to be reduced when the phase c current is about to reach an equilibrium state, after calculation is completed, the controller drives the IGBT through the IGBT driving circuit to act, so that the current flows into the device 5A from the phase c of the system and flows out of 5A to the phase a of the system from the inside, and thus the three-phase currents a, b and c are all redistributed into 10A, and the three-phase total current of the system remains unchanged, thus realizing balanced distribution of the currents, and simultaneously minimizing current fluctuation and guaranteeing stable operation of the system.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A three-phase unbalance management circuit is characterized in that: the IGBT driving circuit comprises IBCT driving circuits for driving a first IGBT tube group, a second IGBT tube group and a third IGBT tube group, wherein the first IGBT tube group, the second IGBT tube group, the third IGBT tube group and the capacitor group form a parallel circuit;
The first IGBT tube group comprises a first IGBT tube (1) and a fourth IGBT tube (4), and the first IGBT tube (1) is connected with the fourth IGBT tube (4) in series;
the second IGBT tube group comprises a second IGBT tube (2) and a fifth IGBT tube (5), and the second IGBT tube (2) is connected with the fifth IGBT tube (5) in series;
The third IGBT tube group comprises a third IGBT tube (3) and a sixth IGBT tube (6), and the third IGBT tube (3) is connected with the sixth IGBT tube (6) in series.
2. A three-phase imbalance treatment circuit according to claim 1, wherein: one side that IGBT tube (1) and No. four IGBT tube (4) are close each other is connected with a phase line electricity, one side that IGBT tube (2) and No. five IGBT tube (5) are close each other is connected with b phase line electricity, one side that IGBT tube (3) and No. six IGBT tube (6) are close each other is connected with c phase line electricity.
3. A three-phase imbalance treatment circuit according to claim 1, wherein: the capacitor group is formed by connecting two capacitors in series.
4. A three-phase imbalance treatment circuit according to claim 1, wherein: the IBCT drive is electrically connected with a controller.
5. The three-phase imbalance treatment circuit according to claim 4, wherein: the controller is electrically connected with a current transformer, and the current transformer collects three-phase current data.
6. A three-phase imbalance treatment circuit according to claim 3, wherein: one side of the two capacitors, which are close to each other, is connected with a ground wire.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221353934U true CN221353934U (en) | 2024-07-16 |
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