CN114172174B - Unbalanced three phase adjusting device for power distribution network - Google Patents
Unbalanced three phase adjusting device for power distribution network Download PDFInfo
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- CN114172174B CN114172174B CN202111561910.3A CN202111561910A CN114172174B CN 114172174 B CN114172174 B CN 114172174B CN 202111561910 A CN202111561910 A CN 202111561910A CN 114172174 B CN114172174 B CN 114172174B
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- bridge arm
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- 239000003990 capacitor Substances 0.000 claims abstract description 35
- 238000010521 absorption reaction Methods 0.000 claims abstract description 25
- 230000005611 electricity Effects 0.000 claims description 10
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a three-phase unbalance adjusting device for a power distribution network, belongs to the field of power electronics and power grids, and aims to solve the problem that energy is wasted due to IGBT peak voltage absorption in the existing three-phase unbalance adjusting device for the power distribution network. The full-bridge circuit comprises a full-bridge circuit formed by IGBTs, wherein an upper bridge arm and a lower bridge arm of the full-bridge circuit are respectively connected in parallel with a peak voltage absorption circuit, the two peak voltage absorption circuits are used for absorbing peak voltages of IGBT tubes in the upper bridge arm and the lower bridge arm, and the peak voltage absorption circuits are also used for outputting a group of direct-current voltages to realize surplus power utilization; the peak voltage absorption circuit comprises a capacitor C1, an electrolytic capacitor C2, an electrolytic capacitor C3, an inductor L1, a resistor R1, a voltage regulator Z1, a voltage regulator Z2, a diode D1 and a diode D2, and the peak voltage absorption circuit of the upper bridge arm outputs residual electric energy output ends V1+ and V1-, and the peak voltage absorption circuit of the lower bridge arm outputs residual electric energy output ends V2+ and V2-.
Description
Technical Field
The invention relates to a three-phase unbalance adjusting technology of a power distribution network, and belongs to the field of power electronics and power grids.
Background
The reasons for generating the three-phase imbalance of the power distribution network are roughly divided into two types, one type is the three-phase imbalance of the system caused by the imbalance of the power supply link, and the other type is the three-phase imbalance of the system caused by the asymmetric load.
In order to solve the problems, a three-phase unbalance adjusting device is configured on a power distribution network for adjustment, the principle of the three-phase unbalance adjusting device is shown in a figure 1, three-phase current in a power distribution system is detected in real time through an external current transformer CT, system current information is sent to an internal controller for analysis and processing, whether a shut-off system is in an unbalanced state or not is judged, a current value required to be converted by each phase when the system reaches the balanced state is calculated, signals are sent to an internal IGBT and drive the IGBT to act, the unbalanced current is transferred from a phase with large current to a phase with small current, three-phase load distribution is adjusted, three-phase load tends to be balanced, line loss is reduced, the problem of single-phase overload of a transformer is solved, power supply quality is improved, and power utilization environment is improved.
The two ends of a key element IGBT in the existing three-phase unbalance adjusting device are easy to generate peak voltage, therefore, an IGBT element is required to be provided with an absorption circuit, the existing peak circuit roughly comprises C, RC, RCD and LC, a first capacitor C is respectively connected in parallel at the two ends of each IGBT, a second capacitor C is changed into an absorption network formed by connecting a resistor R and the capacitor C in series, a third absorption network is formed by connecting the resistor R, the capacitor C and a diode D, and a fourth absorption network is formed by connecting an inductor L and the capacitor C.
Disclosure of Invention
The invention aims to solve the problem that IGBT peak voltage absorbs energy waste in the existing three-phase unbalance adjusting device for the power distribution network, and provides the three-phase unbalance adjusting device for the power distribution network.
The invention discloses a three-phase unbalance adjusting device for a power distribution network, which comprises a full-bridge circuit formed by IGBT (insulated gate bipolar transistor) tubes, wherein an upper bridge arm and a lower bridge arm of the full-bridge circuit are respectively connected with a peak voltage absorbing circuit in parallel, the two peak voltage absorbing circuits are used for absorbing peak voltages of the IGBT tubes in the upper bridge arm and the lower bridge arm, and each peak voltage absorbing circuit is also used for outputting a group of direct current voltages so as to realize utilization of surplus power energy;
the peak voltage absorption circuit comprises a capacitor C1, an electrolytic capacitor C2, an electrolytic capacitor C3, an inductor L1, a resistor R1, a voltage regulator tube Z1, a voltage regulator tube Z2, a diode D1 and a diode D2;
the collector of the IGBT tube is connected with one end of a capacitor C1, and the emitter of the IGBT tube is simultaneously connected with the anode of a voltage-regulator tube Z1, the cathode of an electrolytic capacitor C2, the anode of an electrolytic capacitor C3 and the cathode of a voltage-regulator tube Z2;
the other end of the capacitor C1 is simultaneously connected with the anode of the diode D1 and one end of the inductor L1, the other end of the inductor L1 is connected with one end of the resistor R1, and the other end of the resistor R1 is connected with the cathode of the diode D2;
the cathode of the diode D1 is simultaneously connected with the cathode of the voltage regulator tube Z1 and the anode of the electrolytic capacitor C2, and is used as the positive ends V1+ and V2+ of the residual electricity energy output end;
the anode of the diode D2 is connected with the anode of the voltage regulator tube Z2 and the cathode of the electrolytic capacitor C3 at the same time and is used as the cathode ends V1-V2-of the residual electricity energy output end.
Preferably, the positive pole end V1+ and the negative pole end V1-of the residual electricity energy output end of the spike voltage absorption circuit of the upper bridge arm are positive and negative voltages relative to the neutral point A of the full bridge circuit.
Preferably, the positive and negative terminals V2+ and V2-of the residual electricity energy output terminal of the spike voltage absorbing circuit of the lower bridge arm are positive and negative voltages relative to the negative output terminal of the full bridge circuit.
The invention has the beneficial effects that: the absorption circuit provided by the invention for the IGBT of the three-phase unbalance adjusting device not only can absorb peak voltage, but also can utilize the residual energy, and provides an energy interface to output to the outside, thereby avoiding the waste of energy.
Drawings
Fig. 1 is a schematic diagram of a three-phase unbalance adjustment according to the background art;
fig. 2 is a schematic diagram of a three-phase imbalance adjustment device for a power distribution network according to the present invention.
Detailed Description
The first specific implementation way is as follows: the present embodiment is described below with reference to fig. 2, and the three-phase imbalance adjusting device for a power distribution network according to the present embodiment includes a full-bridge circuit formed by IGBT tubes, where an upper bridge arm and a lower bridge arm of the full-bridge circuit are respectively connected in parallel with a spike voltage absorbing circuit, and the two spike voltage absorbing circuits are used for absorbing spike voltages of the IGBT tubes in the upper and lower bridge arms and outputting a set of dc voltages to realize utilization of surplus electrical energy;
the peak voltage absorption circuit comprises a capacitor C1, an electrolytic capacitor C2, an electrolytic capacitor C3, an inductor L1, a resistor R1, a voltage regulator tube Z1, a voltage regulator tube Z2, a diode D1 and a diode D2;
the collector of the IGBT tube is connected with one end of a capacitor C1, and the emitter of the IGBT tube is simultaneously connected with the anode of a voltage-regulator tube Z1, the cathode of an electrolytic capacitor C2, the anode of an electrolytic capacitor C3 and the cathode of a voltage-regulator tube Z2;
the other end of the capacitor C1 is simultaneously connected with the anode of the diode D1 and one end of the inductor L1, the other end of the inductor L1 is connected with one end of the resistor R1, and the other end of the resistor R1 is connected with the cathode of the diode D2;
the cathode of the diode D1 is simultaneously connected with the cathode of the voltage regulator tube Z1 and the anode of the electrolytic capacitor C2, and is used as the positive ends V1+ and V2+ of the residual electricity energy output end;
the anode of the diode D2 is connected with the anode of the voltage regulator tube Z2 and the cathode of the electrolytic capacitor C3 at the same time and is used as the cathode ends V1-V2-of the residual electricity energy output end.
In the embodiment, two peak voltage absorption circuits are arranged in common, one peak voltage absorption circuit is connected with the three IGBTs of the upper bridge arm in parallel, the other peak voltage absorption circuit is connected with the three IGBTs of the lower bridge arm in parallel, and each peak voltage absorption circuit provides an energy source recycling interface which is respectively V1+, V1-, V2+ and V2-.
And positive and negative terminals V1 & lt + & gt and V1 & lt- & gt of the residual electricity energy output end of the spike voltage absorption circuit of the upper bridge arm are positive and negative voltages relative to a neutral point A of the full bridge circuit.
The positive and negative terminals V2+ and V2-of the residual electricity energy output end of the spike voltage absorption circuit of the lower bridge arm are positive and negative voltages relative to the negative output end of the full bridge circuit.
The peak voltage absorption circuit utilizes C1, L1 and R1 to realize absorption of peak voltage, meanwhile, the peak voltage absorption circuit is provided with two paths, D1 and C2 are one path, D2 and C3 are the other paths opposite to the other paths, when three phases are unbalanced, current can select one path of the two paths according to the unbalanced condition, and Z1 and Z2 clamp C2 and C3 respectively to realize relatively stable output V + and V-, and an energy interface is connected with an external load, so that energy is reused.
Claims (3)
1. The three-phase unbalance adjusting device for the power distribution network is characterized by comprising a full-bridge circuit formed by IGBT tubes, wherein an upper bridge arm and a lower bridge arm of the full-bridge circuit are respectively connected with a peak voltage absorbing circuit in parallel, the two peak voltage absorbing circuits are used for absorbing peak voltages of the IGBT tubes in the upper bridge arm and the lower bridge arm, and each peak voltage absorbing circuit is also used for outputting a group of direct current voltages to realize utilization of surplus power energy;
the peak voltage absorption circuit comprises a capacitor C1, an electrolytic capacitor C2, an electrolytic capacitor C3, an inductor L1, a resistor R1, a voltage regulator tube Z1, a voltage regulator tube Z2, a diode D1 and a diode D2;
the collector of the IGBT tube is connected with one end of a capacitor C1, and the emitter of the IGBT tube is simultaneously connected with the anode of a voltage regulator tube Z1, the cathode of an electrolytic capacitor C2, the anode of an electrolytic capacitor C3 and the cathode of a voltage regulator tube Z2;
the other end of the capacitor C1 is connected with the anode of the diode D1 and one end of the inductor L1 at the same time, the other end of the inductor L1 is connected with one end of the resistor R1, and the other end of the resistor R1 is connected with the cathode of the diode D2;
the cathode of the diode D1 is simultaneously connected with the cathode of the voltage regulator tube Z1 and the anode of the electrolytic capacitor C2, and is used as the positive ends V1+ and V2+ of the residual electricity energy output end;
the anode of the diode D2 is connected with the anode of the voltage regulator tube Z2 and the cathode of the electrolytic capacitor C3 at the same time and is used as the cathode ends V1-V2-of the residual electricity energy output end.
2. The three-phase imbalance adjusting device for the power distribution network according to claim 1, wherein positive and negative terminals V1+ and V1-of the residual power source output terminal of the spike voltage absorbing circuit of the upper bridge arm are positive and negative voltages relative to a neutral point a of the full bridge circuit.
3. The three-phase imbalance adjusting device for the power distribution network according to claim 1, wherein the positive and negative terminals V2+ and V2-of the residual power source output terminal of the spike voltage absorbing circuit of the lower bridge arm are positive and negative voltages relative to the negative terminal of the full bridge circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111561910.3A CN114172174B (en) | 2021-12-20 | 2021-12-20 | Unbalanced three phase adjusting device for power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111561910.3A CN114172174B (en) | 2021-12-20 | 2021-12-20 | Unbalanced three phase adjusting device for power distribution network |
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| Publication Number | Publication Date |
|---|---|
| CN114172174A CN114172174A (en) | 2022-03-11 |
| CN114172174B true CN114172174B (en) | 2022-06-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05260747A (en) * | 1992-03-13 | 1993-10-08 | Brother Ind Ltd | Snubber circuit |
| CN206004524U (en) * | 2016-08-30 | 2017-03-08 | 广东电网有限责任公司电力科学研究院 | A kind of IGBT absorbing circuit of three-phase imbalance adjustment module |
| CN107834832A (en) * | 2017-11-27 | 2018-03-23 | 天津航空机电有限公司 | A kind of voltage peak absorbing circuit |
| CN209823429U (en) * | 2018-07-24 | 2019-12-20 | 国网青海省电力公司黄化供电公司 | Three-phase unbalance compensation device |
-
2021
- 2021-12-20 CN CN202111561910.3A patent/CN114172174B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05260747A (en) * | 1992-03-13 | 1993-10-08 | Brother Ind Ltd | Snubber circuit |
| CN206004524U (en) * | 2016-08-30 | 2017-03-08 | 广东电网有限责任公司电力科学研究院 | A kind of IGBT absorbing circuit of three-phase imbalance adjustment module |
| CN107834832A (en) * | 2017-11-27 | 2018-03-23 | 天津航空机电有限公司 | A kind of voltage peak absorbing circuit |
| CN209823429U (en) * | 2018-07-24 | 2019-12-20 | 国网青海省电力公司黄化供电公司 | Three-phase unbalance compensation device |
Non-Patent Citations (1)
| Title |
|---|
| 三相负荷不平衡自动调节装置应用研究;李宗原等;《电力电子技术》;20200820;第54卷(第08期);71-74 * |
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| CN114172174A (en) | 2022-03-11 |
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Effective date of registration: 20220530 Address after: 154002 No. 179, security road, Qianjin District, Heilongjiang, Jiamusi Applicant after: JIAMUSI POWER SUPPLY COMPANY OF STATE GRID HEILONGJIANG ELECTRIC POWER CO.,LTD. Applicant after: STATE GRID HEILONGJIANG ELECTRIC POWER Co.,Ltd. Applicant after: NORTHEAST DIANLI University Applicant after: STATE GRID CORPORATION OF CHINA Address before: 154002 No. 179, security road, Qianjin District, Heilongjiang, Jiamusi Applicant before: JIAMUSI POWER SUPPLY COMPANY OF STATE GRID HEILONGJIANG ELECTRIC POWER CO.,LTD. Applicant before: Northeast Electric Power University |
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