CN105375500A - Three-phase unbalance monitoring and management system and method for distribution transformer - Google Patents
Three-phase unbalance monitoring and management system and method for distribution transformer Download PDFInfo
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- CN105375500A CN105375500A CN201510826307.1A CN201510826307A CN105375500A CN 105375500 A CN105375500 A CN 105375500A CN 201510826307 A CN201510826307 A CN 201510826307A CN 105375500 A CN105375500 A CN 105375500A
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/40—Arrangements for reducing harmonics
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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
Abstract
The invention relates to the technical field of three-phase unbalance of distribution transformers, in particular to a three-phase unbalance monitoring and management system and method for a distribution transformer. The system comprises three parts, namely an alarm device, an SVG automatic compensation device and a detection device, wherein an outlet line of the distribution transformer is connected to the SVG automatic compensation device through the alarm device; the SVG automatic compensation device is connected with the detection device, and also receives a current transformer signal through the detection device; and meanwhile, the detection device also acts as a feedback circuit of an adjusting device to the line. Negative effects caused by the three-phase unbalance can be effectively managed; the three-phase unbalance monitoring and management system and method have SVG technology adjustment advantages and are relatively short in response time, relatively high in voltage flicker suppression ability and relatively small in floor area; a plurality of compensation functions can be achieved with one set of device; high-capacity reactor and capacitor are not needed as energy storage elements; the power supply reliability can be effectively improved; the electric energy loss is reduced; and the transformer loss is reduced.
Description
Technical field
The present invention relates to distribution transformer three-phase imbalance technical field, particularly relate to a kind of distribution transformer three-phase imbalance inspective regulation system and method.
Background technology
In Distribution network system, there is single-phase, asymmetric, non-linear, impact load in a large number, due to early stage electrical reticulation design plan inconsiderate, there will be the situation that a large amount of single-phase load concentrates on a phase or two-phase, these unbalanced loads can make distribution system produce three-phase imbalance, cause the imbalance of electric power system three-phase voltage, electric current.
Because sharing of load is uneven, load character is also inconsistent, causes the idle deficiency of low-voltage power supply system, load unbalanced, and the regional representation that especially economic level is comparatively flourishing is more obvious.Idle deficiency and load unbalanced two hang-ups having become distribution system.Due to the restriction of the factors such as circuit and distribution transformer One's name is legion, power supply user dispersion, fund cost in Distribution network especially agricultural network, by configuring the modes such as low-voltage reactive compensator capable and solve the problem of three-phase imbalance and unrealistic.Usual way adjusts three-phase equilibrium mutually by the power supply of manual switching single-phase load, but this mode needs first to have a power failure to load to operate again, and this has had a strong impact on the power supply reliability to user, proposes challenge to the quality supply of electrical network.Therefore, the three-phase imbalance problem of Distribution network and rural power grids has become problem demanding prompt solution in current power distribution systems.
Summary of the invention
For Problems existing in above-mentioned technology, the invention provides a kind of distribution transformer three-phase imbalance inspective regulation system and method.Its object is to improve power supply reliability, reduce electric energy loss, reduce transformer loss.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of distribution transformer three-phase imbalance inspective regulation system, comprises warning device, SVG autocompensation installation and checkout gear three parts; Wherein, distribution transformer egress line is by warning device access SVG autocompensation installation, and SVG autocompensation installation connects checkout gear, and SVG autocompensation installation is also by checkout gear received current transducer signal, meanwhile, checkout gear also serves as the feedback network of adjusting device to circuit.
Described SVG autocompensation installation is primarily of main circuit, control circuit, drive circuit composition.Control circuit monitoring electric network state, be connected with drive circuit, drive circuit is connected with main circuit.
Main circuit comprises: voltage-type inverter bridge IGBT and capacitor;
Control circuit bag: current/voltage zero cross signal detection module, digital signal processor DSP and complex programmable logic device (CPLD);
Drive circuit comprises; Comparator, trigger and pwm circuit.
Described current/voltage zero cross signal detection module is used for detection of grid side voltage zero-crossing signal Us, load current IL, output current Ic and dc-link capacitance voltage U c;
DSP is master control device, the generation of main completion system voltage, current signal collection analysis, PDI control, output current reference sinusoidal signal, PWM drive circuit control signal;
CPLD signal interface unit is mainly used in interface signal conversion, focuses on IGBT guard signal, overtemperature protection, air-blower control, pwm signal output.
A kind of distribution transformer three-phase imbalance inspective regulation method is when three-phase imbalance appears in current signal, meeting automatic action alarm, and unbalanced signal is passed to SVG autocompensation installation by warning device; SVG autocompensation installation is analyzed the unbalanced signal received, and the output current after compensation feeds back to electrical network through signal supervisory instrument, and synchronous signal checkout gear is comprehensively analyzed compensation result, satisfies condition signal to export; Do not satisfy condition, then signal negative feedback is carried out second compensation to SVG autocompensation installation.
Signal deteching circuit in described SVG autocompensation installation is used for detection of grid side voltage zero-crossing signal, load current, output current and dc-link capacitance voltage; By power information acquisition system image data, monitoring, analysis the whole province load unbalanced situation in platform district; After distribution transforming three-phase outlet current values gathers in power information acquisition system, analyzed by daemon software, three-phase imbalance situation is added up, and determine that three-phase imbalance controlling device installs reconnaissance to prioritize.
The principle that described three-phase imbalance situation carries out adding up is:
The computing formula of tri-phase unbalance factor: tri-phase unbalance factor=(maximum phase current-minimum phase current)/maximum phase current;
During single-phase maximum load rate≤30%, do not calculate tri-phase unbalance factor, only add up the cumulative time;
During single-phase maximum load rate > 30%, calculate tri-phase unbalance factor, and classify by tri-phase unbalance factor <15%, 50%> tri-phase unbalance factor >=15%, tri-phase unbalance factor >=50%, and add up each cumulative time in stage;
Based on cumulative data analysis, can show that maximum degree of unbalance in the period is selected in distribution transforming simultaneously;
Concrete applicable elements is as follows:
A, quality of power supply requirement Gao Tai district higher for three-phase living load accounting, preferentially select three-phase imbalance autocompensation installation;
B, suggestion autocompensation installation emphasis solve three-phase load and cannot pass through manual adjustment, and tri-phase unbalance factor is lower than 85%, considers the platform district of the impact of SVG compensation capacity and economy;
C, should harmonic suppression apparatus be installed additional for the platform district that harmonic pollution is serious after, can autocompensation installation be used, otherwise neutral current cannot compensate;
D, autocompensation installation replace existing reactive power compensator.
Tool of the present invention has the following advantages and beneficial effect: effectively can administer the negative effect that three-phase imbalance brings, there is SVG technology and regulate advantage, response time is faster, the mutual conversion from specified capacitive reactive power to specified lagging reactive power can be completed within the extremely short time, suppress voltage flicker ability stronger, and use set of device, multiple compensate function can be realized, and owing to doing energy-storage travelling wave tube without the need to jumbo reactor and capacitor, floor space is less.The present invention effectively can also improve power supply reliability, reduces electric energy loss, reduces transformer loss.
Accompanying drawing explanation
Fig. 1 be present system at the scene platform district install electrical primary winding diagram;
Fig. 2 is three-phase imbalance governance flowchart figure of the present invention;
Fig. 3 is SVG compensation arrangement internal structure schematic diagram of the present invention.
In figure: current/voltage zero cross signal detection module 1, CPLD2, DSP3, PWM drive circuit 4, IGBT5.
Embodiment
The present invention is a kind of distribution transformer three-phase imbalance inspective regulation system, is made up of, effectively can improves power supply reliability warning device, SVG autocompensation installation, checkout gear three parts, reduces electric energy loss, reduces transformer loss.As shown in Figure 1, distribution transformer egress line is by warning device access SVG autocompensation installation.SVG autocompensation installation is also by checkout gear received current transducer signal, and meanwhile, checkout gear also serves as the feedback network of adjusting device to circuit.
Described SVG autocompensation installation is primarily of main circuit, control circuit, drive circuit composition.Control circuit monitoring electric network state, be connected with drive circuit, drive circuit is connected with main circuit.
Main circuit comprises: voltage-type inverter bridge IGBT and capacitor;
Control circuit bag: current/voltage zero cross signal monitoring modular, digital signal processor DSP and complex programmable logic device (CPLD);
Drive circuit comprises; Comparator, trigger and pwm circuit.
As shown in Figure 3, in SVG autocompensation installation current/voltage zero cross signal detection module 1 for detection of grid side voltage zero-crossing signal Us, load current IL, output current Ic and dc-link capacitance voltage U c; DSP3 is master control device, and its function is the generation etc. of completion system voltage, current signal collection analysis, PDI control, output current reference sinusoidal signal, PWM drive circuit 4 control signal.CPLD2 signal interface unit is mainly used in interface signal conversion, focuses on IGBT5 guard signal, overtemperature protection, air-blower control, pwm signal output etc.
A kind of distribution transformer three-phase imbalance inspective regulation method, as shown in Figure 2, when three-phase imbalance appears in current signal, understand automatic action alarm, unbalanced signal is passed to SVG autocompensation installation to realization flow by warning device; SVG autocompensation installation is analyzed the unbalanced signal received, and the output current after compensation feeds back to electrical network through signal supervisory instrument, and synchronous signal checkout gear is comprehensively analyzed compensation result, satisfies condition signal to export; Do not satisfy condition, then signal negative feedback is carried out second compensation to SVG autocompensation installation.
In SVG autocompensation installation, signal deteching circuit is used for detection of grid side voltage zero-crossing signal, load current, output current and dc-link capacitance voltage.By power information acquisition system image data, monitoring, analysis the whole province load unbalanced situation in platform district, current Utilities Electric Co. is to after distribution transforming three-phase outlet current values collection in power information acquisition system, analyzed by daemon software, three-phase imbalance situation is added up, and determines that three-phase imbalance controlling device installs reconnaissance to prioritize.
Three-phase imbalance Statistical Principles is:
The computing formula of tri-phase unbalance factor: tri-phase unbalance factor=(maximum phase current-minimum phase current)/maximum phase current;
During single-phase maximum load rate≤30%, do not calculate tri-phase unbalance factor, only add up the cumulative time;
During single-phase maximum load rate > 30%, calculate tri-phase unbalance factor, and classify by tri-phase unbalance factor <15%, 50%> tri-phase unbalance factor >=15%, tri-phase unbalance factor >=50%, and add up each cumulative time in stage;
Based on cumulative data analysis, can show that maximum degree of unbalance in the period is selected in distribution transforming simultaneously;
Advise that concrete applicable elements is as follows:
A, quality of power supply requirement Gao Tai district higher for three-phase living load accounting, can preferentially select three-phase imbalance autocompensation installation.
B, suggestion autocompensation installation emphasis solve three-phase load and cannot pass through manual adjustment, and tri-phase unbalance factor is lower than the impact of 85%(consideration SVG compensation capacity and economy) platform district.
C, should harmonic suppression apparatus be installed additional for the platform district that harmonic pollution is serious after, can autocompensation installation be used, otherwise neutral current cannot compensate.
D, autocompensation installation can replace existing reactive power compensator, when design selection, can save the investment of this part.
As mentioned above, embodiments of the invention have been described in detail, but as long as do not depart from inventive point of the present invention in fact and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation is also all included within protection scope of the present invention.
Claims (6)
1. a distribution transformer three-phase imbalance inspective regulation system, is characterized in that: comprise warning device, SVG autocompensation installation and checkout gear three parts; Wherein, distribution transformer egress line is by warning device access SVG autocompensation installation, and SVG autocompensation installation connects checkout gear, and SVG autocompensation installation is also by checkout gear received current transducer signal, meanwhile, checkout gear also serves as the feedback network of adjusting device to circuit.
2. a kind of distribution transformer three-phase imbalance inspective regulation system according to claim 1, is characterized in that: described SVG autocompensation installation is primarily of main circuit, control circuit, drive circuit composition;
Control circuit monitoring electric network state, be connected with drive circuit, drive circuit is connected with main circuit;
Main circuit comprises: voltage-type inverter bridge IGBT and capacitor;
Control circuit bag: current/voltage zero cross signal detection module (1), digital signal processor DSP and complex programmable logic device (CPLD);
Drive circuit comprises; Comparator, trigger and pwm circuit.
3. a kind of distribution transformer three-phase imbalance inspective regulation system according to claim 2, is characterized in that: described current/voltage zero cross signal detection module (1) is for detection of grid side voltage zero-crossing signal Us, load current IL, output current Ic and dc-link capacitance voltage U c;
DSP(3) be master control device, the generation of main completion system voltage, current signal collection analysis, PDI control, output current reference sinusoidal signal, PWM drive circuit (4) control signal;
CPLD(2) signal interface unit be mainly used in interface signal conversion, focus on IGBT(5) guard signal, overtemperature protection, air-blower control, pwm signal export.
4. a distribution transformer three-phase imbalance inspective regulation method, is characterized in that: when three-phase imbalance appears in current signal, meeting automatic action alarm, and unbalanced signal is passed to SVG autocompensation installation by warning device; SVG autocompensation installation is analyzed the unbalanced signal received, and the output current after compensation feeds back to electrical network through signal supervisory instrument, and synchronous signal checkout gear is comprehensively analyzed compensation result, satisfies condition signal to export; Do not satisfy condition, then signal negative feedback is carried out second compensation to SVG autocompensation installation.
5. a kind of distribution transformer three-phase imbalance inspective regulation method according to claim 1, is characterized in that: the signal deteching circuit in described SVG autocompensation installation is used for detection of grid side voltage zero-crossing signal, load current, output current and dc-link capacitance voltage; By power information acquisition system image data, monitoring, analysis the whole province load unbalanced situation in platform district; After distribution transforming three-phase outlet current values gathers in power information acquisition system, analyzed by daemon software, three-phase imbalance situation is added up, and determine that three-phase imbalance controlling device installs reconnaissance to prioritize.
6. a kind of distribution transformer three-phase imbalance inspective regulation method according to claim 5, is characterized in that: the principle that described three-phase imbalance situation carries out adding up is:
The computing formula of tri-phase unbalance factor: tri-phase unbalance factor=(maximum phase current-minimum phase current)/maximum phase current;
During single-phase maximum load rate≤30%, do not calculate tri-phase unbalance factor, only add up the cumulative time;
During single-phase maximum load rate > 30%, calculate tri-phase unbalance factor, and classify by tri-phase unbalance factor <15%, 50%> tri-phase unbalance factor >=15%, tri-phase unbalance factor >=50%, and add up each cumulative time in stage;
Based on cumulative data analysis, can show that maximum degree of unbalance in the period is selected in distribution transforming simultaneously;
Concrete applicable elements is as follows:
A, quality of power supply requirement Gao Tai district higher for three-phase living load accounting, preferentially select three-phase imbalance autocompensation installation;
B, suggestion autocompensation installation emphasis solve three-phase load and cannot pass through manual adjustment, and tri-phase unbalance factor is lower than 85%, considers the platform district of the impact of SVG compensation capacity and economy;
C, should harmonic suppression apparatus be installed additional for the platform district that harmonic pollution is serious after, can autocompensation installation be used, otherwise neutral current cannot compensate;
D, autocompensation installation replace existing reactive power compensator.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105807684A (en) * | 2016-03-15 | 2016-07-27 | 石狮国高电子科技有限公司 | Energy-saving control system for building |
| CN106786679A (en) * | 2016-12-16 | 2017-05-31 | 湖南世优电力科技股份有限公司 | Agriculture net platform region electric energy voltage balancing control system and method based on Real-time Power Flow |
| WO2017175016A1 (en) * | 2016-04-05 | 2017-10-12 | György Róbert | Circuit arrangement and device for load balance of parallel conductors of ac systems |
| CN108736495A (en) * | 2018-07-03 | 2018-11-02 | 北京智创骏驰电气科技有限公司 | A kind of novel phase-change switch device |
| TWI666460B (en) * | 2018-08-10 | 2019-07-21 | 東元電機股份有限公司 | Rapid test method for motor layer short |
| CN111049163A (en) * | 2019-12-02 | 2020-04-21 | 贵州电网有限责任公司 | Treatment method for three-phase imbalance generated by grid connection of single-phase distributed power supply |
| CN111044893A (en) * | 2019-12-12 | 2020-04-21 | 云南电网有限责任公司临沧供电局 | System and method for measuring load response time of phase change switch |
| CN113328517A (en) * | 2021-05-11 | 2021-08-31 | 北京华服物业管理有限责任公司朝阳分公司 | Wisdom electricity distribution room |
| CN114221325A (en) * | 2021-11-15 | 2022-03-22 | 国网辽宁省电力有限公司锦州供电公司 | Method for automatically adjusting three-phase unbalanced load of distribution transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105807684A (en) * | 2016-03-15 | 2016-07-27 | 石狮国高电子科技有限公司 | Energy-saving control system for building |
| WO2017175016A1 (en) * | 2016-04-05 | 2017-10-12 | György Róbert | Circuit arrangement and device for load balance of parallel conductors of ac systems |
| CN106786679A (en) * | 2016-12-16 | 2017-05-31 | 湖南世优电力科技股份有限公司 | Agriculture net platform region electric energy voltage balancing control system and method based on Real-time Power Flow |
| CN108736495A (en) * | 2018-07-03 | 2018-11-02 | 北京智创骏驰电气科技有限公司 | A kind of novel phase-change switch device |
| TWI666460B (en) * | 2018-08-10 | 2019-07-21 | 東元電機股份有限公司 | Rapid test method for motor layer short |
| CN111049163A (en) * | 2019-12-02 | 2020-04-21 | 贵州电网有限责任公司 | Treatment method for three-phase imbalance generated by grid connection of single-phase distributed power supply |
| CN111044893A (en) * | 2019-12-12 | 2020-04-21 | 云南电网有限责任公司临沧供电局 | System and method for measuring load response time of phase change switch |
| CN111044893B (en) * | 2019-12-12 | 2020-11-13 | 云南电网有限责任公司临沧供电局 | System and method for measuring load response time of phase change switch |
| CN113328517A (en) * | 2021-05-11 | 2021-08-31 | 北京华服物业管理有限责任公司朝阳分公司 | Wisdom electricity distribution room |
| CN114221325A (en) * | 2021-11-15 | 2022-03-22 | 国网辽宁省电力有限公司锦州供电公司 | Method for automatically adjusting three-phase unbalanced load of distribution transformer |
| CN114221325B (en) * | 2021-11-15 | 2023-05-02 | 国网辽宁省电力有限公司锦州供电公司 | Method for automatically adjusting three-phase unbalanced load of distribution transformer |
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