CN105958516A - Device and method for treating condition that three-phase imbalance of distribution network terminal causes low voltage - Google Patents
Device and method for treating condition that three-phase imbalance of distribution network terminal causes low voltage Download PDFInfo
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- CN105958516A CN105958516A CN201610371780.XA CN201610371780A CN105958516A CN 105958516 A CN105958516 A CN 105958516A CN 201610371780 A CN201610371780 A CN 201610371780A CN 105958516 A CN105958516 A CN 105958516A
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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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- 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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Abstract
The invention discloses a device and method for treating a condition that the three-phase imbalance of a distribution network terminal causes a low voltage, and belongs to the technical field of power systems. The device has the structure that a voltage and current collection part (1) which is used for collecting the voltage and current values of each home-entry phase is connected with a home-entry terminal; the output end of the voltage and current collection part (1) is connected with a voltage and current comparison part (2); the output end of the voltage and current comparison part (2) is connected with a control switching part (3); and the control switching part (3) is connected with a load. According to the invention, the device effectively solves a problem that the three-phase imbalance of the distribution network terminal causes the low voltage, does not refer to the reconstruction and reforming of a power grid, is low in cost, achieves the real-time monitoring of the power grid, can adjust the load in real time according to the conditions, achieves the no-delay processing, and guarantees the stable operation of a load which cannot be switched off.
Description
Technical field
The invention discloses a kind of distribution network terminal and caused controlling device and the administering method of low-voltage by three-phase imbalance, it belongs to technical field of power systems.
Background technology
Along with economic growth and social progress, some technical problems present in power distribution network, the problem of the low-voltage particularly caused by load three-phase imbalance is the most prominent, the improvement of load three-phase imbalance has become as those skilled in the art and is badly in need of solving the technical problem that.
At present, the method of domestic solution three-phase imbalance mainly has following several: one is lines escalation, out-of-balance load is disperseed, out-of-balance load in electrical network is carried out distributing supply, i.e. according to the character of load, circuit is carried out transformation to rebuild, can avoid owing to concentrating the too much uncompensated load of connection to cause the serious energy imbalance of electrical network to occur, its process needs to collect related data, such as: the information such as the recent daily load curve in this area and change thereof；Two is to be appropriately distributed in each phase by asymmetric load, namely single-phase load is the most balancedly distributed in three-phase power supply system, single-phase load position in three-phase power supply system is unreasonable is the main cause causing energy imbalance to occur, so when the corresponding electric power system of initial design, just single-phase load the most balancedly should be distributed in three-phase power supply system, to reduce the purpose of tri-phase unbalance factor；Three is to correct three-phase imbalance with reactive power compensation, and this measure mainly carries out reactive power compensation by split-phase, returns to poised state with correction as much as possible already at the three-phase system of unbalanced state.
But all there is certain technical problem in above-mentioned three kinds of solutions, specific as follows: first two method relates to the upgrading of electrical network, economic input is bigger, and cost performance is the lowest, can not recoup the investment in life cycle management, so both approaches can not be popularized.The third method, also has bigger economic input, and the engineering time is long, management inconvenience；Owing to randomness and the uncertainty of load cause reactive power compensation to there is hysteresis quality, institute administers for three-phase imbalance in this approach and there is also corresponding problem.
Summary of the invention
A kind of distribution network terminal that the present invention is contemplated to solve above-mentioned technical problem and provides is caused controlling device and the administering method of low-voltage by three-phase imbalance, the present invention effectively solves the problem that distribution network terminal is caused low-voltage by three-phase imbalance, it is not related to rebuild electrical network, transform, low cost, achieve and electrical network is monitored in real time, can according to circumstances real-time Load adjustment, no-delay process can be accomplished, it is ensured that the stable operation of uninterrupted load.
In order to solve above-mentioned technical problem, the present invention is achieved through the following technical solutions:
Distribution network terminal is caused the controlling device of low-voltage by three-phase imbalance, its structure is as follows: the voltage x current collection portion for gathering the every phase voltage current value registered one's residence being connected with end of registering one's residence, the outfan in voltage x current collection portion is connected with voltage x current comparing section, the outfan of voltage x current comparing section is connected with controlling switching portion, controls switching portion and is connected with load.
Above-mentioned voltage x current collection portion is voltage transformer summation current transformer.
Above-mentioned end of registering one's residence is three-phase voltage or single-phase voltage.
Above-mentioned voltage x current comparing section is operating amplifier with current feedback and Voltage Feedback operational amplifier.
Above-mentioned control switching portion is thyristor control switching device.
Distribution network terminal is caused the administering method of low-voltage by three-phase imbalance, and its step is as follows: the voltage x current collection portion being connected with end of registering one's residence gathers the every phase voltage current value registered one's residence, and collected voltage x current value is transferred to voltage x current comparing section；Voltage x current comparing section exports thyristor triggering impulse signal to controlling switching portion after comparing analysis；Control switching portion to judge according to load type according to received start pulse signal and control load whether switching.
When above-mentioned load is three-phase load, before three-phase load closes a floodgate, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, if voltage is in allowed band value, voltage x current comparing section sends thyristor triggering impulse signal to controlling switching portion, control switching portion circuit ON, it is allowed to load uses, if voltage is in low-voltage state, does not allow it to close a floodgate；When three-phase load has turned in circuit, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, when line voltage is in low-voltage, carry out judging whether to excise load according to load type, further according to needs, electrical equipment is accessed in mains-power circuit when line voltage reaches conformance with standard, if this load type is uninterrupted load, then load does not allow excision.
Above-mentioned load is single-phase load, before single-phase load is closed a floodgate, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, if now line voltage is in poised state, voltage x current comparing section sends thyristor triggering impulse signal to controlling switching portion, control switching portion circuit ON, control switching portion automatically load to be connected in any one phase of A, B, C, if unbalanced source voltage is still in allowed band value, then load is connected on high the going up mutually of voltage, otherwise, permissible load does not accesses circuit；When single-phase load has turned in circuit, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, when line voltage in allowed limits time, by controlling switching portion, load is connected on high the going up mutually of voltage, when line voltage the most in allowed limits time, according to the type of load judge excise load order.
Above-mentioned line voltage allowed band value is >=198V.
Owing to using technique scheme so that the invention have the advantages that and effect:
The present invention is the purpose by the regulation of load side load reaches to administer three-phase imbalance, voltage x current can be detected by real time, monitors electrical network in real time, can according to circumstances real-time Load adjustment, no-delay process can be accomplished, it is ensured that the stable operation of uninterrupted load.The present invention can effectively improve power distribution network resident and register one's residence the phenomenon of end low-voltage, and the electricity consumption decreasing low-voltage cause the user is inconvenient, improves the quality of life of resident.Small investment of the present invention, low cost, cost recovery is fast, easy to use, installs and has a power failure for a long time without large area, is beneficial to promote.The present invention is not limited by line length, makes up equipment design defect, has consolidated stablizing of electrical network.The operation of the whole circuit of the present invention need not artificial real-time participation, it is achieved that Automated condtrol.Solve the technical problem that it is by distribution network voltage electric current being measured and comparing the place determining three-phase imbalance problem at load side, it is not related to rebuild electrical network, transform, and by automatic control and adjustment, single-phase load is adjusted to the high phase of voltage or according to load type, three-phase or single-phase load is put into or excised.
Accompanying drawing explanation
Fig. 1 is circuit structure block diagram during band three-phase load of the present invention.
Fig. 2 is circuit structure block diagram during band single-phase load of the present invention.
In figure, 1, voltage x current collection portion, 2, voltage x current comparing section, 3, control switching portion, 4, three-phase load, 5, single-phase load.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further details, but protection scope of the present invention is not limited by embodiment.
Embodiment
1
:
As shown in Figure 1, distribution network terminal of the present invention is caused the controlling device of low-voltage by three-phase imbalance, its structure is as follows: the voltage x current collection portion 1 for gathering the every phase voltage current value registered one's residence being connected with end of registering one's residence, voltage x current collection portion 1 is voltage transformer summation current transformer, the outfan in voltage x current collection portion 1 is connected with voltage x current comparing section 2, the outfan of voltage x current comparing section 2 is connected with controlling switching portion 3, controls switching portion 3 and three-phase load 4.
Above-mentioned end of registering one's residence is three-phase voltage or single-phase voltage, and voltage x current comparing section 2 is operating amplifier with current feedback and Voltage Feedback operational amplifier.Controlling switching portion 3 is thyristor control switching device.
Distribution network terminal is caused the administering method of low-voltage as follows by three-phase imbalance: distribution network terminal is caused the administering method of low-voltage by three-phase imbalance, its step is as follows: the voltage x current collection portion being connected with end of registering one's residence gathers the every phase voltage current value registered one's residence, and collected voltage x current value is transferred to voltage x current comparing section；Voltage x current comparing section exports thyristor triggering impulse signal to controlling switching portion after comparing analysis；Control switching portion to judge according to three-phase load type according to received start pulse signal and control three-phase load whether switching.
Specifically comprise the following steps that when load is three-phase load, before three-phase load closes a floodgate, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, if voltage is (>=198V) in allowed band value, voltage x current comparing section sends thyristor triggering impulse signal to controlling switching portion, control switching portion circuit ON, it is allowed to load uses, if voltage is in low-voltage state, does not allow it to close a floodgate；When three-phase load has turned in circuit, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, when line voltage is in low-voltage, carry out judging whether to excise load according to load type, if this load is interruptible load such as TV, electric heater, smoke extractor etc., or can short interruptions load such as computer, electric refrigerator etc., then by controlling switching portion, these can be met excision, further according to needs, electrical equipment is accessed in mains-power circuit when line voltage reaches conformance with standard, if this load type is uninterrupted load, such as hospital's electricity consumption, municipal administration electricity consumption etc., these loads do not allow excision.
Embodiment
2
:
As shown in Figure 2, distribution network terminal of the present invention is caused the controlling device of low-voltage by three-phase imbalance, its structure is as follows: the voltage x current collection portion 1 for gathering the every phase voltage current value registered one's residence being connected with end of registering one's residence, voltage x current collection portion 1 is voltage transformer summation current transformer, the outfan in voltage x current collection portion 1 is connected with voltage x current comparing section 2, the outfan of voltage x current comparing section 2 is connected with controlling switching portion 3, controls switching portion 3 and unidirectional phase load 5.
Above-mentioned end of registering one's residence is three-phase voltage or single-phase voltage, and voltage x current comparing section 1 is operating amplifier with current feedback and Voltage Feedback operational amplifier.Controlling switching portion 3 is thyristor control switching device.
Distribution network terminal is caused the administering method of low-voltage as follows by three-phase imbalance: distribution network terminal is caused the administering method of low-voltage by three-phase imbalance, its step is as follows: the voltage x current collection portion being connected with end of registering one's residence gathers the every phase voltage current value registered one's residence, and collected voltage x current value is transferred to voltage x current comparing section；Voltage x current comparing section exports thyristor triggering impulse signal to controlling switching portion after comparing analysis；Control switching portion to judge according to single-phase load type according to received start pulse signal and control single-phase load whether switching.
Specifically comprise the following steps that load is single-phase load, before single-phase load is closed a floodgate, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, if now line voltage is in poised state voltage x current comparing section and sends thyristor triggering impulse signal to controlling switching portion, control switching portion circuit ON, control switching portion automatically load to be connected in any one phase of A, B, C, if unbalanced source voltage is still in allowed band value, then load is connected on high the going up mutually of voltage, otherwise, permissible load does not accesses circuit；When single-phase load has turned in circuit, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, as line voltage (>=198V) in allowed limits, by controlling switching portion, load is connected on high the going up mutually of voltage, when line voltage the most in allowed limits time, type according to load judges to excise the order of load, to ensure the stable operation of uninterrupted load.
Claims (9)
1. distribution network terminal is caused the controlling device of low-voltage by three-phase imbalance, it is characterized in that structure is as follows: the voltage x current collection portion (1) for gathering the every phase voltage current value registered one's residence being connected with end of registering one's residence, the outfan in voltage x current collection portion (1) is connected with voltage x current comparing section (2), the outfan of voltage x current comparing section (2) is connected with controlling switching portion (3), controls switching portion (3) and is connected with load.
Distribution network terminal the most according to claim 1 is caused the controlling device of low-voltage by three-phase imbalance, it is characterised in that described voltage x current collection portion (1) is voltage transformer summation current transformer.
Distribution network terminal the most according to claim 1 is caused the controlling device of low-voltage by three-phase imbalance, it is characterised in that described end of registering one's residence is three-phase voltage or single-phase voltage.
Distribution network terminal the most according to claim 1 is caused the controlling device of low-voltage by three-phase imbalance, it is characterised in that described voltage x current comparing section (2) is operating amplifier with current feedback and Voltage Feedback operational amplifier.
Distribution network terminal the most according to claim 1 is caused the controlling device of low-voltage by three-phase imbalance, it is characterised in that described control switching portion is thyristor control switching device.
6. distribution network terminal described in a claim 1 is caused the administering method of low-voltage by three-phase imbalance, it is characterized in that step is as follows: the voltage x current collection portion being connected with end of registering one's residence gathers the every phase voltage current value registered one's residence, and collected voltage x current value is transferred to voltage x current comparing section；Voltage x current comparing section exports thyristor triggering impulse signal to controlling switching portion after comparing analysis；Control switching portion to judge according to load type according to received start pulse signal and control load whether switching.
Distribution network terminal the most according to claim 6 is caused the administering method of low-voltage by three-phase imbalance, it is characterized in that when described load is three-phase load, before three-phase load closes a floodgate, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, if voltage is in allowed band value, voltage x current comparing section sends thyristor triggering impulse signal to controlling switching portion, control switching portion circuit ON, permissible load uses, if voltage is in low-voltage state, does not allow it to close a floodgate；When three-phase load has turned in circuit, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, when line voltage is in low-voltage, carry out judging whether to excise load according to load type, further according to needs, electrical equipment is accessed in mains-power circuit when line voltage reaches conformance with standard, if this load type is uninterrupted load, then load does not allow excision.
Distribution network terminal the most according to claim 6 is caused the administering method of low-voltage by three-phase imbalance, it is characterized in that described load is single-phase load, before single-phase load is closed a floodgate, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, if now line voltage is in poised state, voltage x current comparing section sends thyristor triggering impulse signal to controlling switching portion, control switching portion circuit ON, control switching portion and automatically load is connected on A, B, in any one phase of C, if unbalanced source voltage is still in allowed band value, then load is connected on high the going up mutually of voltage, otherwise, permissible load does not accesses circuit；When single-phase load has turned in circuit, by voltage x current collection portion and voltage x current comparing section, line voltage is carried out detection to compare, when line voltage in allowed limits time, by controlling switching portion, load is connected on high the going up mutually of voltage, when line voltage the most in allowed limits time, according to the type of load judge excise load order.
9. caused the administering method of low-voltage by three-phase imbalance according to the distribution network terminal described in claim 7 or 8, it is characterised in that described line voltage allowed band value is >=198V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610371780.XA CN105958516B (en) | 2016-05-31 | 2016-05-31 | Distribution network terminal is caused the controlling device and administering method of low-voltage by three-phase imbalance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610371780.XA CN105958516B (en) | 2016-05-31 | 2016-05-31 | Distribution network terminal is caused the controlling device and administering method of low-voltage by three-phase imbalance |
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| CN105958516A true CN105958516A (en) | 2016-09-21 |
| CN105958516B CN105958516B (en) | 2019-09-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579532A (en) * | 2017-08-08 | 2018-01-12 | 陈鸽 | A kind of low-voltage network threephase load balance method |
| CN116742661A (en) * | 2023-08-14 | 2023-09-12 | 国网山西省电力公司临汾供电公司 | Three-phase unbalance treatment device based on three-sagging control |
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| CN102394501A (en) * | 2011-03-18 | 2012-03-28 | 北京潞能麒麟电力设备有限公司 | Energy-saving method and device based on power grid load dynamic balance |
| CN102904270A (en) * | 2012-11-05 | 2013-01-30 | 镇江长河电力技术有限公司 | Three-phase current unbalance adjusting system for power distribution network |
| CN204681092U (en) * | 2015-05-22 | 2015-09-30 | 国家电网公司 | A kind of low-frequency and low-voltage load-reducing system |
| CN105207237A (en) * | 2015-09-22 | 2015-12-30 | 国网电网公司 | Distribution network three-phase load unbalance adjusting control system |
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2016
- 2016-05-31 CN CN201610371780.XA patent/CN105958516B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102394501A (en) * | 2011-03-18 | 2012-03-28 | 北京潞能麒麟电力设备有限公司 | Energy-saving method and device based on power grid load dynamic balance |
| CN102904270A (en) * | 2012-11-05 | 2013-01-30 | 镇江长河电力技术有限公司 | Three-phase current unbalance adjusting system for power distribution network |
| CN204681092U (en) * | 2015-05-22 | 2015-09-30 | 国家电网公司 | A kind of low-frequency and low-voltage load-reducing system |
| CN105207237A (en) * | 2015-09-22 | 2015-12-30 | 国网电网公司 | Distribution network three-phase load unbalance adjusting control system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579532A (en) * | 2017-08-08 | 2018-01-12 | 陈鸽 | A kind of low-voltage network threephase load balance method |
| CN116742661A (en) * | 2023-08-14 | 2023-09-12 | 国网山西省电力公司临汾供电公司 | Three-phase unbalance treatment device based on three-sagging control |
| CN116742661B (en) * | 2023-08-14 | 2023-10-27 | 国网山西省电力公司临汾供电公司 | Three-phase unbalance treatment device based on three-phase sagging control |
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| CN105958516B (en) | 2019-09-03 |
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