CN102487197A - Three-phase load balancer of small-power set - Google Patents
Three-phase load balancer of small-power set Download PDFInfo
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- CN102487197A CN102487197A CN2010105811813A CN201010581181A CN102487197A CN 102487197 A CN102487197 A CN 102487197A CN 2010105811813 A CN2010105811813 A CN 2010105811813A CN 201010581181 A CN201010581181 A CN 201010581181A CN 102487197 A CN102487197 A CN 102487197A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to the power supply equipment technology field, especially to a load balancing device of a small-power generator set. The balancer employs a PLC full-automatic control. Besides, the balancer comprises: a PLC module; a relay output module, which is connected with the PLC module and is used for directly loading a resistance load on a uniphase output that is underloaded by the set by a relay contact; an analog quantity input module, which is connected with the PLC module and is used for converting an analog signal into a digital signal and transmitting the digital signal to the PLC module; a power transducer, which is connected with the analog quantity input module as well as is used for converting a three-phase output signal of a small-power set into an analog signal and transmitting the converted analog signal to the analog quantity input module; and a relay, which is connected with the relay output module. According to the invention, a PLC full-automatic control is employed to carry out load distribution, thereby realizing three-phase load balancing of a set. Besides, the balance has advantages of simple structure, scientific and reasonable performance, low investment cost, and simple operation. Moreover, an operation ratio of equipment of the set is improved.
Description
Technical field:
The present invention relates to the power supply unit technical field, refer in particular to the load balance device of small power generator group.
Background technology:
Along with development of modern science and technology, its load form variation exerts a certain influence to the quality of power supply, and various device to the quality of power supply require increasingly highly, this is more and more obvious to contradiction.Diesel generating set allows the limit value of tolerance 25% three-phase imbalance load, when surpassing this limit value, will cause the diesel engine generator heating in winding to be multiplied, the also corresponding increase of the vibrations of unit, and failure rate also thereby significantly rises.Under this background, the applicant is adhering to research innovation, excelsior spirit, utilizes its professional eye and professional knowledge, works out a kind of small-power unit threephase load balancer.
Summary of the invention:
The object of the present invention is to provide the automatic control of a kind of PLC of employing to carry out the single-phase small-power unit threephase load balancer that off-load impels load balancing that adds again.
Still a further object of the present invention provides a kind of simple in structure, and is scientific and reasonable, and cost of investment is low, and the operation operation is easy, improved the small-power unit threephase load balancer of the operation ratio of unit equipment greatly.
For achieving the above object, the present invention adopts following technical scheme:
A kind of small-power unit threephase load balancer, this balancer adopts the PLC Automatic Control, includes:
One PLC module;
One relay output module that is connected with the PLC module, relay output module directly is carried in resistive load in the underload single-phase output of unit through relay contact;
The one analog quantity input module that is connected with the PLC module, the analog quantity input module is digital signal with analog signal conversion and flows to the PLC module;
One power transducer that is connected with the analog quantity input module, power transducer through converting analog signal into, flows to the analog quantity input module with small-power unit three-phase output signal;
One relay that is connected with relay output module.
Said resistive load is that the resistive load by 4 1KW of each single-phase access constitutes.
Whole service process of the present invention is carried out load allocating by the PLC Automatic Control and is reached unit threephase load equilibrium; Before this with three-phase current signal difference access power transmitter; Be converted into analog signal then and flow to the analog quantity input module, analog quantity input mould is digital signal with analog signal conversion and is conveyed into the PLC module and analyzes comparison, by PLC each phase load degree of unbalance relatively; When a certain phase load degree of unbalance surpasses 25%; The PLC output order is given relay output module, and through relay contact resistive load directly is carried in the underload single-phase output of generator, when unit three-phase output signal recovers just often; Be added in underload single-phase load and shed automatically, reached the tri-phase unbalance factor that comes to change flexibly generating set through reprogramming thus.
Further advantage of the present invention is simple in structure, and is scientific and reasonable, and cost of investment is low, and the operation operation is easy, improved the operation ratio and the operability of unit equipment greatly, optimizes unit and uses.
Description of drawings:
Accompanying drawing 1 is circuit theory diagrams of the present invention;
Accompanying drawing 2 is logic diagram of the present invention.
Embodiment:
Below in conjunction with accompanying drawing the present invention is further specified:
Consult Fig. 1, shown in 2, a kind of small-power unit threephase load balancer provided by the invention, this balancer adopts the PLC Automatic Control, includes:
One PLC module 1 realizes the threephase load of intelligent control unit;
One relay output module 2 that is connected with PLC module 1, relay output module directly is carried in resistive load 5 in the underload single-phase output of unit through relay contact;
The one analog quantity input module 3 that is connected with PLC module 1, the analog quantity input module is digital signal with analog signal conversion and is conveyed into PLC module 1;
One power transducer 4 that is connected with analog quantity input module 3, power transducer through converting analog signal into, flows to analog quantity input module 3 with small-power unit three-phase output signal;
One relay 6 that is connected with relay output module 2.
Said resistive load 5 is that the resistive load by 4 1KW of each single-phase access constitutes.
During work; Power transducer 4 is exported signal through converting analog signal into small-power unit three-phase;, analog quantity input module 3 flows to PLC module 1 after converting digital signal into; Output order was given relay output module 2 after PLC module 1 was analyzed the signal that receives relatively, and relay output module 2 directly is carried in resistive load 5 in the underload single-phase output of generator through relay 6 contacts; When unit three-phase output signal recovers just often, be added in underload single-phase load and shed automatically.
Work-based logic figure shown in Figure 2; The present invention's initialization of switching on before this begins to monitor the unit three-phase current then, and three-phase current signal is access power transmitter 4 respectively; Be converted into analog signal and give analog quantity input module 3; 1), low excessively as finding yellow phase power analog quantity input module 3 is converted into analog signal digital signal and is conveyed in the PLC module 1 analyzes comparison, realizes promptly the unit three phase power being monitored by adopting the PLC Automatic Control to carry out the intelligent decision power situation:; Then increase load automatically; And make the respective load switch through relay output module 2 and close a floodgate (corresponding relay 6 is connected), the loading that promptly hits pay dirk, other two phase also is to carry out the power monitoring adjustment through mode like this.2), too high as finding yellow phase power, then reduce load automatically, and do respective load switch separating brake (corresponding relay 6 break off) through relay output module 2, loadings that promptly hit pay dirk, other two also is to carry out power monitoring adjustment through mode like this mutually.
Embodiment:
The operation principle of threephase load balancer is described with the load of representative communication base station below; Suppose that this communication base station load is made up of 7.5kW three-phase rectifier and 2 2kW unit air conditioner in machine room; Amount to load 11.5kW; The unit model of apolegamy is western electric TM22 unit, and its long row power/non-firm power is respectively 16Kw/17kW, and operating mode is following before inserting the threephase load balancer:
Each phase load distributes as follows in 50% time:
A phase 2.5kW+2kW=4.5kW
B phase 2.5kW
C phase 2.5kW
Each phase load distributes as follows in 30% time:
A phase 2.5kW+2kW=4.5kW
B phase 2.5kW+2kW=4.5kW
C phase 2.5kW
Each phase load distributes as follows in 20% time:
A phase 2.5kW
B phase 2.5kW
C phase 2.5kW
Can find out that from above the maximum load degree of unbalance is (4.5-2.5)/(16.8/3) * 100%=36%, this generating set allows the limit value of tolerance 25% three-phase imbalance load head and shoulders above, causes heating in winding to be multiplied, the also corresponding increase of the vibrations of unit.
After adopting the threephase load balancer; In the output of threephase load balancer input termination small-power unit three-phase; Resistive load 5 is divided into three groups of each single-phase outputs of receiving unit respectively; Every group of resistive load has the resistive load of 4 1KW of parallel connection, by PLC control single-phase resistive load shared out equally effectively in the output of generator three-phase.Its control procedure is: at first with three-phase current signal difference access power transmitter 4, be converted into analog signal then and flow to analog quantity input module 3, the digital signal of analog quantity input module 3 outputs gets into PLC module 1 and analyzes comparison; When a certain phase load degree of unbalance surpasses 25%; PLC module 1 output order is given relay output module 2; Relay 6 contacts are carried in resistive load 5 in the underload single-phase output of generator, when unit three-phase output signal recovers just often, have been added in underload single-phase load and have been shed automatically.
Operating mode is following after inserting the threephase load balancer:
The working condition of generator is improved greatly:
Each phase load distributes as follows in 80% time:
A phase, B reach C mutually and are 2.5kW+2kW=4.5kW mutually
Each phase load distributes as follows in 20% time:
A phase, B reach C mutually and are 2.5kW mutually
Can find out from top example, behind the employing threephase load balancer, because the generating set that single-phase air-conditioning causes output threephase load imbalance problem is readily solved.
Claims (2)
1. small-power unit threephase load balancer is characterized in that: this balancer adopts the PLC Automatic Control, includes:
One PLC module (1);
One relay output module (2) that is connected with PLC module (1), relay output module directly is carried in resistive load (5) in the underload single-phase output of unit through relay contact;
The one analog quantity input module (3) that is connected with PLC module (1), the analog quantity input module is digital signal with analog signal conversion and flows to PLC module (1);
One power transducer (4) that is connected with analog quantity input module (3), power transducer through converting analog signal into, flows to analog quantity input module (3) with small-power unit three-phase output signal;
One relay (6) that is connected with relay output module (2).
2. according to the described a kind of small-power unit threephase load balancer of claim, it is characterized in that: resistive load (5) is that the resistive load by 4 1KW of each single-phase access constitutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105811813A CN102487197A (en) | 2010-12-01 | 2010-12-01 | Three-phase load balancer of small-power set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105811813A CN102487197A (en) | 2010-12-01 | 2010-12-01 | Three-phase load balancer of small-power set |
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| CN102487197A true CN102487197A (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010105811813A Pending CN102487197A (en) | 2010-12-01 | 2010-12-01 | Three-phase load balancer of small-power set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103400710A (en) * | 2013-08-22 | 2013-11-20 | 秦宇翔 | Balanced leveling method for three-phase loads of low-voltage power network and automatic load transferring switch |
| CN105449700A (en) * | 2015-12-30 | 2016-03-30 | 北京四方继保自动化股份有限公司 | Balance control system and method of three-phase active unbalanced loads of isolated grid generator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2202994Y (en) * | 1993-02-15 | 1995-07-05 | 梅岭芳 | Electricity transmission three-phase automatic balancing device |
| CN2899232Y (en) * | 2006-03-23 | 2007-05-09 | 江苏省电力公司南京供电公司 | Loss-descending loading economical phase adjuster |
| CN101179197A (en) * | 2007-12-03 | 2008-05-14 | 黑龙江中星科技股份有限公司 | Three-phase load automatic equalization device of power distribution network |
| CN201956697U (en) * | 2010-12-01 | 2011-08-31 | 西电(汕头保税区)动力设备有限公司 | Triphase load balancer of low power unit |
-
2010
- 2010-12-01 CN CN2010105811813A patent/CN102487197A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2202994Y (en) * | 1993-02-15 | 1995-07-05 | 梅岭芳 | Electricity transmission three-phase automatic balancing device |
| CN2899232Y (en) * | 2006-03-23 | 2007-05-09 | 江苏省电力公司南京供电公司 | Loss-descending loading economical phase adjuster |
| CN101179197A (en) * | 2007-12-03 | 2008-05-14 | 黑龙江中星科技股份有限公司 | Three-phase load automatic equalization device of power distribution network |
| CN201956697U (en) * | 2010-12-01 | 2011-08-31 | 西电(汕头保税区)动力设备有限公司 | Triphase load balancer of low power unit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103400710A (en) * | 2013-08-22 | 2013-11-20 | 秦宇翔 | Balanced leveling method for three-phase loads of low-voltage power network and automatic load transferring switch |
| CN105449700A (en) * | 2015-12-30 | 2016-03-30 | 北京四方继保自动化股份有限公司 | Balance control system and method of three-phase active unbalanced loads of isolated grid generator |
| CN105449700B (en) * | 2015-12-30 | 2018-05-25 | 北京四方继保自动化股份有限公司 | The active out-of-balance load balance control system of island network generator three-phase and control method |
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Application publication date: 20120606 |