CN105322551A - Low-voltage line voltage stepped series-connection superposition compensation system - Google Patents
Low-voltage line voltage stepped series-connection superposition compensation system Download PDFInfo
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- CN105322551A CN105322551A CN201410335402.7A CN201410335402A CN105322551A CN 105322551 A CN105322551 A CN 105322551A CN 201410335402 A CN201410335402 A CN 201410335402A CN 105322551 A CN105322551 A CN 105322551A
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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
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a low-voltage line stepped series-connection superposition compensation system, which is a comprehensive treatment scheme for a problem that voltage at the tail end of a low-voltage line is too low because of the low-voltage line is too long. According to the system disclosed by the invention, a plurality of superposition principle based voltage compensation devices are connected to sections of a rural low-voltage power supply line in a scattered mode, communication is performed through a communication mode of electric power carriers, and autonomous control of each voltage compensation device is realized. Each voltage compensation device of the rural low-voltage line voltage stepped series-connection superposition compensation system can complete autonomous control thereof according to voltage conditions of an access point and states of the other voltage compensation devices, stepped compensation for the voltage of a low-voltage circuit is realized, and the voltage level of the whole low-voltage line is enabled to meet power utilization requirements of users. In addition, the low-voltage line voltage stepped series-connection superposition compensation system has the advantages of small size, light weight, high reliability, convenient installation, good voltage compensation effect, no voltage loss in the voltage regulating process and the like.
Description
Technical field
The present invention relates to a kind of low-voltage circuit voltage steps ladder type overlapped in series bucking-out system.
Background technology
The present situation in current most rural area is: take in low, living standard is low, inhabitation relative distribution, although solve Rural areas electricity problem, power load amount is on the low side, the problem of rural area low-voltage supply line ubiquity brownout.
Study carefully its cause: be rural residence relative distribution on the one hand, cause the supply district of transformer platform area comparatively large, the radius of electricity supply of low-voltage distributing line is longer, and the pressure drop of low-voltage circuit is comparatively large, makes line end brownout; On the other hand, because power load is on the low side, amount of power supply is not enough, and economic benefit is difficult to embody, and the mode being thus difficult to be increased by investment transformer platform area reduces supply district.Thus the voltage of Rural Areas at Present circuit is often in fluctuation status, and when power load is larger, low-voltage circuit voltage levvl is obviously on the low side, and especially at the end of low-voltage circuit, brownout even can not meet the starting resistor requirement of electrical appliance.Rural area low-voltage circuit brownout problem has become the problem left over by history failing for a long time to obtain properly settling.
The approach solving rural line brownout problem has: the supply district 1) reducing transformer platform area, it thoroughly solves the too low Last Resort of line voltage distribution.But due to rural residence dispersion, power load is low, and this solution means the platform district quantity that will roll up transformer, but amount of power supply can not get corresponding growth, and thus huge investment does not have economy return support, dead end; 2) trial technological means solves brownout problem.
The major programme that current employing technological means solves brownout problem has: the exit potential 1) being heightened transformer platform area by on-load voltage regulation tap, although the program can promote the terminal voltage of low-voltage circuit to a certain extent, but circuit leading portion supply power voltage can be caused higher, easily burn out the power consumption equipment of leading portion user, too high voltage also can cause damaging to be increased, and disagrees with energy-saving and cost-reducing aim; 2) autotransformer pressure regulation scheme is adopted, by the conversion of gear, voltage can be remained on a qualified level, but due to autotransformer volume large, Heavy Weight, generally all need vertical rod to install, thus cause mounting points floor space large, costly, bury bar quantities large, the inconveniences such as the cycle is long, and user's end of short duration power-off decompression phenomenon may be there is in gear-change operation, and application is restricted; 3) adopt reactive power compensation technology, reduce the apparent current of circuit, thus the pressure drop that reduction line impedance causes, the effect promoting circuit terminal voltage can be reached.The device of the program is adopted to have the feature of small in volume, when obviously on the low side and three-phase imbalance is serious, there is certain effect at load power factor, but its limitation is also fairly obvious, be mainly reflected in: capacitor is fragile, not obvious etc. to the line voltage distribution castering action that power factor is higher; 4) thyristor voltage regulation scheme, by the effect of thyristor phase modulation, realizes the adjustment to voltage, but due to technical sophistication, work harmonic pollution is serious, and the problems such as reliability is low also fail to obtain practical application.
The above-mentioned various technological means of comprehensive analysis, it is expect to solve low-voltage circuit brownout problem by an equipment or device at all, problem is: the basic reason producing line voltage distribution reduction causes because electricity consumption electric current produces pressure drop in line impedance, thus for arbitrary low-voltage supply line, its line voltage distribution level is a drop wire, its sagging slope determined by line impedance and the acting in conjunction of electricity consumption electric current, therefore merely select to carry out booster tension at some somes installation equipment in this supply line, that the voltage levvl being difficult to meet whole piece circuit requires.
Summary of the invention
For problems of the prior art, the object of the present invention is to provide a kind of low-voltage circuit voltage steps ladder type overlapped in series bucking-out system, this system is by several voltage compensating devices of series connection access in low-voltage supply line, the staged realizing low-voltage circuit voltage compensates, thus the voltage levvl of whole piece low-voltage circuit can be reached meet the electricity consumption requirement of user.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of low-voltage circuit voltage steps ladder type overlapped in series bucking-out system, this bucking-out system comprises some voltage compensating devices in series connection access low-voltage supply line, be provided with three end mutual reactor and control modules in described electrical compensation device, described control module comprises current sampling circuit, voltage sample circuit, on line state communication check circuit and CPU; Wherein,
Described current sampling circuit, for gathering the current signal of described voltage compensating device output, and inputs in described CPU by this current signal;
Described voltage sample circuit, for gathering the voltage signal of described voltage compensating device input, and inputs in described CPU by this voltage signal;
Described on line state communication check circuit, for exchanging working state signal between described voltage compensating device, and inputs this signal in described CPU, so that CPU is according to the start-stop of other voltage compensating devices in circuit, determines the state of self;
Described CPU, processes the signal received, controls unlatching or the closedown of described three end mutual reactors, compensates to realize stepwise voltage.
Further, according to described current signal, described CPU judges whether described low-voltage power supply circuit transships.
Further, according to described voltage signal, described CPU judges that whether the magnitude of voltage of described low-voltage power supply circuit is lower than supply power voltage typical set value.
Further, the signal of communication of described on line state communication check circuit directly transmits on described low-voltage supply line in the mode of carrier wave.
Low-voltage circuit voltage steps ladder type overlapped in series bucking-out system involved in the present invention, by some voltage compensating device distributings are connected and are linked in each segmentation of low-voltage supply line, under the autonomous cooperation control of each voltage compensating device, stepped compensation is carried out to low-voltage circuit voltage, the voltage levvl of whole piece low-voltage circuit can be reached meet the electricity consumption requirement of user.In addition, because voltage compensating device is by the access of three end mutual reactors with whether exit the voltage compensation that controls just to realize low-voltage circuit, device has that volume is little, lightweight, reliability is high, easy for installation, voltage compensation is effective, the voltage-regulation process not advantage such as decompression.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention distribution schematic diagrams;
Fig. 2 is the structural representation of voltage compensating device of the present invention;
Fig. 3 is the structural representation of control system of the present invention;
Fig. 4 is the line voltage distribution design sketch after the invention process.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, low-voltage circuit voltage steps ladder type overlapped in series bucking-out system of the present invention comprises some voltage compensating device BV, on the live wire L that each voltage compensating device BV connects between access different loads district, its electrical wiring mode is: on the live wire L after first paragraph equivalent load Z1, series connection access voltage compensating device BV1, then after second segment equivalent load Z2, series connection access voltage compensating device BV2 again, the rest may be inferred, after n-th section of equivalent load Zn, series connection access voltage compensating device BVn, its output voltage is for driving (n+1)th section of equivalent load Zn+1, the zero line of each voltage compensating device BV all links together with the zero line N of supply line, and by being arranged on the control system CS on each voltage compensating device, realize each voltage compensating device from master control, cooperation, and then the staged realizing low-voltage circuit compensates, make the voltage levvl of whole piece low-voltage circuit can reach the need for electricity of user.
As shown in Figure 2, voltage compensating device BV comprises three end mutual reactor XB, protection fuse R, control switch K1, by-pass switch K2 and control system CS, wherein the common port of three end mutual reactor XB is connected with input live wire L, the less one end of the three end mutual reactor XB numbers of turn is connected with output live wire, the more one end of the three end mutual reactor XB numbers of turn is connected with one end of control switch K1, the other end of control switch K1 is connected with one end of protection fuse R, the other end of protection fuse is then connected on the zero line N of supply line, the two ends of by-pass switch K2 respectively with input live wire L with export live wire and be connected, when K1 closes, when K2 opens, voltage compensating device starts, when K1 opens, when K2 closes, voltage compensating device is closed.
As shown in Figure 3, control system CS comprises current sampling circuit I, voltage sample circuit U, on line state communication check circuit S and central control circuit CPU, wherein current sampling circuit I is used for the output current size of sampled voltage compensation arrangement BV, and sampled result is sent to described central control circuit CPU, CPU and judges whether output current transships with this, voltage sample circuit is used for the voltage between sampled voltage compensation arrangement BV input live wire L and zero line N, with this, CPU judges that voltage between voltage compensating device BV input live wire L and zero line N is the need of compensation, and sampled result is sent to central control circuit CPU, on line state communication check circuit S is for carrying out On-line measurement to the running status of each the voltage compensating device BV1 ~ BVn be connected on low-voltage circuit, obtain the state information of each voltage compensating device, and testing result is sent to central control circuit CPU, central control circuit CPU is to the current sampling circuit I received, the Information Monitoring of voltage sample circuit U and on line state communication check circuit S processes, and send control command to control switch K1 and by-pass switch K2, thus realize controlling voltage compensating device, wherein, the communication mode between each voltage compensating device is carrier communication, and signal of communication directly transmits on low-voltage supply line, avoids and again sets up communication line, simplifies system authority.
As shown in Figure 4, if low-voltage supply line does not do any indemnifying measure, along with the increase of line length, its line voltage distribution is falling characteristic, the slope declined depends on the size of power load, when power load is little, descending slope is also little, and line voltage distribution reduces few, and when power load is larger, descending slope is comparatively large, and line end voltage will be obviously on the low side, as shown in phantom in Figure 4; After adopting low-voltage circuit voltage steps ladder type overlapped in series bucking-out system of the present invention, when power load increase causes the voltage in each segmentation of low-voltage circuit all on the low side, the voltage compensating device be connected in each segmentation of low-voltage circuit incites somebody to action all input compensation successively, and the change of line voltage distribution will as shown in solid line in Fig. 4.As can be seen here, the staged that the present invention can realize low-voltage circuit voltage compensates, and the voltage levvl of whole piece low-voltage circuit can be reached meet the electricity consumption requirement of user.
When supply line's voltage is lower than electricity consumption required voltage, current sampling circuit, voltage sample circuit and on line state communication check circuit obtain the work state information of the output end current signal of voltage compensating device, input terminal voltage signal and other voltage compensating devices respectively, CPU is according to the output end current signal of voltage compensating device, the work state information of input terminal voltage signal and other voltage compensating devices judges that described voltage compensating device is the need of unlatching, its detailed process is: CPU judges successively from the operating state of the first voltage compensating device lower than supply power voltage typical set value, the voltage compensating device action successively risen along with the first voltage compensating device lower than supply power voltage typical set value, as after the voltage compensating device of CPU self place, supply power voltage is still lower than voltage standard set point, then CPU sends open command, start CPU self place voltage compensating device, otherwise CPU self place voltage compensating device, without the need to starting, realizes the interlock step by step of voltage compensating device, and then realizes the compensation step by step of low-voltage supply line.
Specifically when described voltage signal is lower than supply power voltage typical set value, and when described current signal does not transship, described voltage compensating device just allows to open; When described voltage signal is lower than supply power voltage typical set value, but during described current signal overload, described voltage compensating device does not allow to open, and avoids supply line's current overload with this, or aggravation supply line current overload degree.
When supply line's voltage is higher than electricity consumption required voltage, current sampling circuit, voltage sample circuit and on line state communication check circuit obtain the work state information of the output end current signal of voltage compensating device, input terminal voltage signal and other voltage compensating devices respectively, CPU is according to the output end current signal of voltage compensating device, the work state information of input terminal voltage signal and other voltage compensating devices judges that described voltage compensating device is the need of closedown, its detailed process is: CPU judges successively from the operating state of the first voltage compensating device higher than supply power voltage typical set value, the voltage compensating device action successively risen along with the first voltage compensating device higher than supply power voltage typical set value, as after the voltage compensating device of CPU self place, supply power voltage is still higher than voltage standard set point, then CPU sends out code, close CPU self place voltage compensating device, otherwise CPU self place voltage compensating device is without the need to closing.
Enumerate two specific embodiments below to illustrate the course of work of low-voltage circuit voltage steps ladder type overlapped in series bucking-out system of the present invention:
embodiment one
Connect access 5 voltage compensating device BV1-BV5 in low-voltage supply line, for convenience of description, all replace 5 voltage compensating devices with BV1-BV5 below, the operating state of BV1-BV5 respectively: BV1 is in opening, and BV2, BV3, BV4 and BV5 are in closed condition.If now, the equivalent load of the low-voltage supply line between BV1 and BV2 strengthens, cause the input voltage of BV2-BV5 all lower than supply power voltage set point, even if the now output current nonoverload of BV5, it also first will obtain the operating state of BV2-BV4 by line state telecommunication circuit, after BV2-BV4 has responded, whether detect the input voltage of now BV5 self more still lower than supply power voltage set point, the information such as whether output current transships, if output current does not transship, and input voltage is still lower than supply power voltage set point, so now BV5 will send open command, control three end mutual reactor XB to start working, voltage compensation is provided to power supply circuits, if output current does not transship, but input voltage has reached supply power voltage set point, now BV5 will maintain closed condition, in addition, if the current sampling circuit of BV5 detects that output current transships, so no matter input voltage is any state, BV5 can not open.
embodiment two
Connect access 5 voltage compensating device BV1-BV5 in low-voltage supply line, for convenience of description, all replace 5 voltage compensating devices with BV1-BV5 below, the operating state of BV1-BV5 respectively: BV1 is in closed condition, and BV2, BV3, BV4 and BV5 are in opening.If now, the equivalent load of the low-voltage supply line between BV1 and BV2 reduces, cause the input voltage of BV2-BV5 all higher than supply power voltage set point, even if the now output current nonoverload of BV5, it also first will obtain the operating state of BV2-BV4 by line state telecommunication circuit, after BV2-BV4 has responded, whether detect the input voltage of now BV5 self more still higher than supply power voltage set point, the information such as whether output current transships, if output current does not transship, and input voltage is still higher than supply power voltage set point, so now BV5 will send out code, control three end mutual reactor XB to quit work, if output current does not transship, but input voltage has dropped to supply power voltage set point, now BV5 will maintain opening.
Above-mentioned example is just for illustration of the present invention, and embodiments of the present invention are not limited to these examples, and what those skilled in the art made meets the various embodiments of inventive concept all within protection scope of the present invention.
Claims (4)
1. a low-voltage circuit voltage steps ladder type overlapped in series bucking-out system, it is characterized in that, this bucking-out system comprises some voltage compensating devices in series connection access low-voltage supply line, be provided with three end mutual reactor and control modules in described electrical compensation device, described control module comprises current sampling circuit, voltage sample circuit, on line state communication check circuit and CPU; Wherein,
Described current sampling circuit, for gathering the current signal of described voltage compensating device input, and inputs in described CPU by this current signal;
Described voltage sample circuit, for gathering the voltage signal of described voltage compensating device input, and inputs in described CPU by this voltage signal;
Described on line state communication check circuit, for exchanging working state signal between described voltage compensating device, and inputs this signal in described CPU, so that CPU is according to the start-stop of other voltage compensating devices in circuit, determines the state of self;
Described CPU, processes the signal received, controls unlatching or the closedown of described three end mutual reactors, compensates to realize stepwise voltage.
2. low-voltage circuit voltage steps ladder type overlapped in series bucking-out system as claimed in claim 1, it is characterized in that, according to described current signal, described CPU judges whether described low-voltage power supply circuit transships.
3. low-voltage circuit voltage steps ladder type overlapped in series bucking-out system as claimed in claim 1, it is characterized in that, according to described voltage signal, described CPU judges that whether the magnitude of voltage of described low-voltage power supply circuit is lower than supply power voltage typical set value.
4. low-voltage circuit voltage steps ladder type overlapped in series bucking-out system as claimed in claim 1, it is characterized in that, the signal of communication of described on line state communication check circuit directly transmits on described low-voltage supply line in the mode of carrier wave.
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| CN201410335402.7A CN105322551A (en) | 2014-07-15 | 2014-07-15 | Low-voltage line voltage stepped series-connection superposition compensation system |
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| CN201410335402.7A CN105322551A (en) | 2014-07-15 | 2014-07-15 | Low-voltage line voltage stepped series-connection superposition compensation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109149569A (en) * | 2018-09-14 | 2019-01-04 | 国网安徽省电力有限公司培训中心 | A kind of voltage based on network system and amperometry processing system |
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| CN201594201U (en) * | 2009-11-30 | 2010-09-29 | 东莞市西屋电气设备制造有限公司 | Alternating current voltage stabilizer |
| CN202663114U (en) * | 2012-06-28 | 2013-01-09 | 四川省电力公司乐山电业局 | Voltage compensation system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1604421A (en) * | 2004-08-11 | 2005-04-06 | 北京四方清能电气电子有限公司 | Unified electric energy quality controller |
| CN201594201U (en) * | 2009-11-30 | 2010-09-29 | 东莞市西屋电气设备制造有限公司 | Alternating current voltage stabilizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109149569A (en) * | 2018-09-14 | 2019-01-04 | 国网安徽省电力有限公司培训中心 | A kind of voltage based on network system and amperometry processing system |
| CN109149569B (en) * | 2018-09-14 | 2023-01-31 | 国网安徽省电力有限公司培训中心 | Voltage and current analysis processing system based on power grid system |
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