CN101404414A

CN101404414A - Power distribution network electromagnetic optimization dynamic loss reduction method, system and synthetic loss reduction system

Info

Publication number: CN101404414A
Application number: CNA2008101415529A
Authority: CN
Inventors: 王磊
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-09-28
Filing date: 2008-09-28
Publication date: 2009-04-08
Anticipated expiration: 2028-09-28
Also published as: CN101404414B

Abstract

The invention relates to a dynamic loss reduction method for a distribution network and a synthesized loss reduction system of a distribution network. A principle that an electric field and a magnetic field are mutually symbiotic and affected is applied for dynamically realizing electromagnetic balance; the treatment of'peak load shifting'is carried out on the current difference value between three-phase unbalanced currents caused by the dynamic unbalance of the power used by a three-phase load at the secondary side of a distribution transformer so as to lead the current difference value to approach balance, reduce a zero sequence current and the unbalance degree of the three phases, and restrain a harmonic, thereby realizing the self loss (loss on transmission) of the distribution transformer and the line loss (the copper loss of the line) at the first side and the secondary side of the distribution transformer; the synthesized loss reduction system of the distribution network realizes the synthesized loss reduction management of the distribution network, the loss on transmission of the distribution transformer as well as the automatic measuring and accounting on the data of the copper loss of the line at the first side and the secondary side thereof; the system also realizes the remote automatic collection on the power data of the distribution transformer in the same time as well as the accounting of the line loss of a distribution line, calculates and accounts the line loss of the distribution network, calculates and analyzes the loss reduction as well as analyzes the benefits of energy saving and emission reduction.

Description

Power distribution network electromagnetic optimization dynamic loss reduction method, system and synthetic loss reduction system

One, technical field:

The present invention relates to that damage method dynamically falls in a kind of power distribution network and the damage system falls in power distribution network synthesis, especially relate to a kind of power distribution network electromagnetic optimization dynamic loss reduction method and synthetic loss reduction system.

Two, background technology:

Power industry is the big power consumer, and relevant data shows that China Power industrial consumption coal was about 1,100,000,000 tons in 2005, and consumption coal proportion accounts for more than 50% of 21.9 hundred million tons of Chinese coal output.According to initial estimate, the first half of the year in 2008, nationwide units GDP power consumption was 1433.8 kilowatt hours/ten thousand yuan, than increasing by 75.3 kilowatt hours/ten thousand yuan the end of last year, rose 5.5%.The power industry whole nation in first half of the year generating consumes 4.82 hundred million tons in raw coal, increases by 8.12% on a year-on-year basis.Power industry realizes energy-saving and cost-reducing significant.

Line loss is the electric energy loss that all devices produces in the power network, and promptly electric energy is transferred to client's process from the power plant, the kwh loss and the loss that produce in each link of transmission of electricity, power transformation, distribution and marketing.The technology line loss two large divisions that line loss mainly comprises the management line loss that causes because of artificial origins such as " race ", " emitting ", " dripping ", " leakages " and causes because of the technical reasons such as running status of the structure of electrical network, distribution transformer.For a long time, the line loss problem is a difficult problem of puzzlement power supply industry always.Line loss rate is as important economic and technical norms of power supply enterprise, and it just is directly connected to economic benefit, social benefit and environmental benefit.

The too high phenomenon of line loss ubiquity in China in the power distribution network, and still do not have effective solution and approach.According to long-term data monitored in real time as can be known: the three-phase imbalance rate of the distribution transformer in the power distribution network " exceeds standard " up to about 70% at present, there is every day the distribution transformer about 40% to operate in " underloading " or " non-economy operation areas " such as " overloads " the very big (see figure 8) of the technology line loss that causes thus.The data of authoritative department also confirm: the line loss in the power distribution network accounts for more than 60% of full electric network line loss.Related data shows, 2007 are only electric energy loss that Henan Electric Power Company causes because of line loss just up to 82.4 hundred million kWh, 35.9 hundred million yuan of direct economic losses.Well imagine thus because of the waste that line loss causes every year in the whole nation.The Study on Sustainable Development center Contract Research Fellow doctor Zhang Anhua of the Chinese Academy of Social Sciences writes articles " case study of China Power industry efficiency " and appeals: " in the power transmission and distribution link, the loss that reduces transformer (the especially following middle-size and small-size transformer of 10kV) becomes the task of top priority.”

At present, doing the emphasis and the difficult point that damage work is each power supply enterprise of falling of low and medium voltage distribution network well, also is the energy-saving and cost-reducing key of power supply enterprise.Cause the too high main cause of power distribution network line loss to be:

1. threephase load imbalance seriously causes line loss too high.Distribution transformer varies in size because of the load that articulates, each load electricity consumption service time inconsistent, cause distribution transformer use in its three-phase institute bringing onto load present the dynamic unbalance state.Ubiquitous threephase load non-equilibrium state causes zero-sequence current excessive in this electricity consumption link, produces bigger electric energy loss.By calculating as can be known: when the loss on transmission when transformer is in the maximum unbalanced operation state of three-phase load is poised state 3 times.Tri-phase unbalance factor is bigger, and zero-sequence current is just bigger, and the line loss increase is also bigger.Three-phase imbalance not only adds lossy, also can reduce the useful life of distribution transformer when serious, even burn.This three-phase imbalance phenomenon of ubiquity during " public distribution transformer " uses is especially more outstanding with agricultural distribution transformer.

Power supply industry is perfectly clear to the electric energy loss that the threephase load imbalance problem causes, and also takes many methods to make every effort to solve the electric energy loss that three-phase imbalance causes.Mainly be reasonable disposition, the adjustment of loading, strive that the load size on each phase circuit is consistent as far as possible according to the situation of three-phase load.But this method has just solved the imbalance problem of a static state, because the electricity consumption time is inconsistent, the relative equilibrium under the static state has been transformed into imbalance at once again under dynamic environment.Be that three-phase imbalance state in the power distribution network is the universal phenomenon of absolute being.The operation of the three-phase imbalance of distribution transformer is inevitably in the real work, and the three-phrase burden balance power supply has become the emphasis of line loss management.Find in time that in the distribution transformer running threephase load is uneven and dynamically adjust its three-phase imbalance but is a very thing of difficulty.

2. single-phase nonlinear-load equipment rapidly increases and causes harmonic pollution serious.All nonlinear-loads can both produce harmonic current, and the device type that produces harmonic wave has: switched-mode power supply (SMPS), electric ballast, speed-regulating actuator, uninterrupted power supply (ups) Unity, magnetive cord equipment and some household electrical appliance such as television set etc.Coming into operation of more and more non-linear, impact load makes that the harmonic pollution of electrical network is serious day by day.Zero sequence 3 subharmonic that non-linear electrical equipment produces in the power distribution network can superpose on the neutral line, electric current is increased, cause voltage centerline skew, distribution system is produced harm, cause voltage distortion, zero passage noise, problems such as the neutral line is overheated, transformer is overheated, circuit breaker misoperation.

3. the operating state of existing reactive-load compensation equipment causes anxiety, and fails to produce a desired effect.Have a large amount of induction motor and other inductive power consumption equipments of adopting in the electric power system, they also need electric power system to supply with a large amount of reactive powers except that the active power work done of absorption system.These reactive powers cause the loss of reactive power again through the conveying and the conversion of multistage power transmission sequence, transformer, and power factor of electric network is descended.This has not only reduced exerting oneself of power supply equipment, causes the fluctuation of line voltage, has also increased electric energy loss.From nineteen nineties, country throws huge fund and implements " two net improvement projects " in power industry, promotes " reactive power compensation technology " at power distribution network.Principle according to " grading compensation, in-situ balancing " progressively installs " reactive power compensator " additional to distribution transformer, to improve power factor.According to us " reactive power compensator " the actual monitoring data of Zhengzhou electric company part hanging net operation and the equipment running status selective examination of other electric company of Henan Province are learnt: the reactive power compensator more than 95% is in " abnormal operating state " basically, the a variety of causes that exists except that compensation arrangement self causes the irregular operating, the outlet overtension of distribution transformer is (more than 90%, see Fig. 9), also cause the equipment work precondition not satisfy and do not play a role.In addition, the higher superfluous power wastage that also causes the user of distribution transformer supply power voltage.When supply power voltage be higher than rated value 10% the time because the saturated influence of magnetic circuit, reactive power will increase very soon.According to interrelated data statistics, when supply power voltage be rated value 110% the time, the reactive power of general factory will increase about 35%.

4. too much distribution transformer is operated in " non-economy operation area " and causes line loss to increase.The economy load rate of distribution transformer is 60%～70% of its rated power.It is its unloaded reactive power that distribution transformer consumes idle Main Ingredients and Appearance.As everyone knows, when distribution transformer operates in " underloading " or " non-economy operation areas " such as " overloads ", can produce bigger electric energy loss.In order to improve the power factor of power distribution network, distribution transformer should " zero load " operation or is in low load (" underloading ") running status for a long time, can not long-term work at excess load (" overload ") state.The reasons such as waste of superfluous electric power in the three-phase imbalance electric current that the threephase load imbalance causes and the zero-sequence current of generation, the harmonic pollution that load characteristic causes, idle scarcity and the power supply link, and distribution transformer operates in " non-economy traffic coverage ", the statistical error that the line loss statistics time difference causes, these factors are interweaved, influence each other, cause the technology line loss dynamic change in the low and medium voltage distribution network, can't predict.

The randomness of electricity consumption time, with the lack of uniformity of electric loading and the uncertainty of electricity consumption load characteristic, also be to cause the multifarious reason of the technology line loss origin cause of formation, cause technology to fall the difficulty of damage and complicated, it falls to decrease and has little effect to rely on unicity ground to fall the damage technology.Actual count data for many years show: at present power supply enterprise generally adopts, and " reactive power compensator " that be used for reducing line loss rate is in " improper " operating state basically because of multiple reason; Though and some voltage adjusting devices can realize reducing the effect of " surplus " power wastage, can not realize other is influenced the improvement of line loss factor.In sum, the diversity of the technology line loss origin cause of formation causes technology to fall the complexity and the great difficulty of damage.Solve the emphasis and the difficult point problem of the wastage reducing and energy saving work of above restriction power supply enterprise, the means of must depending on science and technology, carry out technological innovation and autonomous innovation; Must the employing system, comprehensive and creationary scientific and technical means, makes up comprehensive damage system platform, each level of realization power distribution network, the synthetic loss reduction of each link of falling.

Three, summary of the invention:

The present invention overcomes existing power distribution network and falls the deficiency of decreasing technical elements, a kind of power distribution network electromagnetic optimization dynamic loss reduction method and power distribution network electromagnetic optimization dynamic loss reduction system are proposed, utilization electric field and magnetic field symbiosis each other, interactional principle, dynamically realize " electromagnetism containing ", electric current difference between the dynamic unbalanced three-phase imbalance electric current that causes of distribution transformer secondary side three characteristics of the middle term load electricity consumption is carried out " peak load shifting " to be handled, make it to tend to be balanced, reduce zero-sequence current, reduce tri-phase unbalance factor, the harmonic wave of drawing up, thus realize reducing distribution transformer own loss (loss on transmission) and reduction distribution transformer one, the line loss of secondary side (circuit copper loss);

Propose a kind of power distribution network synthesis simultaneously and fall the damage system, realize that automatic gauge, the statistics of the circuit copper loss data of decreasing management and distribution transformer loss on transmission and one, secondary side fall in power distribution network synthesis, and the analysis of the statistics of statistics, calculating and the power distribution network line loss of the remote auto collection by communication system realization distribution transformer synchronization electric quantity data, distribution line line loss, the computational analysis of calculating and falling damage, energy-saving and emission-reduction benefit.

The technical solution adopted in the present invention is:

A kind of power distribution network electromagnetic optimization dynamic loss reduction method, secondary side output series connection electromagnetism at distribution transformer is transferred the weighing apparatus unit, described electromagnetism transfers the weighing apparatus unit to comprise cross-over connection, mix the three-phase winding element that is wound on three groups of magnetic posts that are overrided to form by silicon steel or silicon steel sheet, each of three-phase winding element all comprises a certain number of series connection mutually and is wound on two coils on the adjacent magnetic post, two one on adjacent magnetic posts are body magnetic post, another is a cross-over connection magnetic post, coil on the body magnetic post adopts the clockwise direction coiling, coil on the cross-over connection magnetic post adopts coiling counterclockwise, and its coil turn calculates according to falling the damage amplitude requirement; The head end of each phase winding connects a phase of distribution transformer secondary side in the three-phase winding element, and the end of each phase winding all connects the zero line N phase of distribution transformer secondary side; Each phase winding of three-phase winding element has the access point of a plurality of leading points as this phase load, draw the load output that connects distribution transformer through multi-channel gating switch on the body magnetic post winding coil of the access point of every phase load by its place, according to detected three-phase current signal, when the threephase load imbalance appears in the load output of distribution transformer, size according to the threephase load degree of unbalance is passed through multi-channel gating switch, big certain of phase current is added to a negative fluxfield with former FR, with former magnetic field " offset " to reduce this magnetic flux mutually, reduce phase current; Simultaneously, to little certain of phase current apply mutually one with former magnetic field positive flux field in the same way, with former magnetic field " stack " to increase this magnetic flux mutually, increase this phase current, realization is carried out " peak load shifting " to three-phase current and is handled, it is poor to reduce phase current, finish the real-time adjustment of three-phase imbalance electric current, make it dynamically to tend to relative equilibrium, reduce zero-sequence current, reduce tri-phase unbalance factor, reduce the centerline skew, reduce the copper loss on the distribution transformer secondary side 380V low-voltage circuit, reduce the own loss of distribution transformer, and then the copper loss on the reduction distribution transformer primary side 10kV high-tension line, reduce the copper loss of distribution line and the line loss of power distribution network.

Described power distribution network electromagnetic optimization dynamic loss reduction method, in the three-phase circuit of distribution transformer secondary side output, be parallel with the capacitance compensation unit, described capacitance compensation unit is by power capacitor, the compensation control switch constitutes, according to detected power factor, reactive power, voltage, the size of capacitor's capacity parameter, when power factor not in interval value 0.85～0.95, voltage be no more than preset value (as can be set to the transformer load voltage value+7% or-10%), and when required reactive power is thrown the appearance value of electric capacity greater than plan, by the compensation control switch electric capacity of correspondence is put in the electrical network, reactive power so that compensation lacks improves power factor; When voltage exceeds preset value or power factor greater than higher limit 0.95; According to the principle of " throw earlier cut earlier ", or look the principle of emergency " speed is cut ", excise corresponding electric capacity by described compensation control switch.

A kind of power distribution network electromagnetic optimization dynamic loss reduction system, contain the synthetic loss reduction device (1) in the output circuit that is connected on the distribution transformer secondary side, described synthetic loss reduction device comprises synthetic loss reduction controller (11), electromagnetism accent weighing apparatus unit (12), wherein the electromagnetism of synthetic loss reduction controller (11) transfers weighing apparatus control output interface (1121) control connection electromagnetism to transfer weighing apparatus unit (12), electromagnetism transfers the input (121) of weighing apparatus unit (12) to connect the three-phase output end of distribution transformer secondary side, the output (122) that electromagnetism is transferred weighing apparatus unit (12) with link to each other with electric loading; Synthetic loss reduction device (1) contains multichannel electric parameter signal synchronous collection unit (111), gather respectively synchronously three-phase voltage, current signal, synthetic loss reduction device (1) input side, three-phase voltage, the current signal of outlet side and the synthetic loss reduction device (1) of flowing through on the distribution transformer primary side 10kV circuit 3 the tunnel in all or part of zero sequence current signal input synthetic loss reduction controller (11); Synthetic loss reduction controller (11) calculates the tri-phase unbalance factor of distribution transformer secondary side, when tri-phase unbalance factor during greater than a certain preset value 2%, perhaps, size according to the zero-sequence current of distribution transformer secondary side, when zero-sequence current during (or be set to 15%, 20%, 25% etc.) greater than the some percentage 10% of distribution transformer rated current, export corresponding electromagnetism and transfer the weighing apparatus control signal, transfer weighing apparatus unit (12) to drop into electromagnetism and be " mode of operation ", otherwise, then transfer weighing apparatus unit (12) to cut its " bypass " mode of operation electromagnetism.

The mode of operation control switch of electromagnetism accent weighing apparatus unit comprises distribution transformer synthetic loss reduction device by-pass switch and transfers weighing apparatus to throw/cut control switch with the electric current of described by-pass switch mutual exclusion in the synthetic loss reduction device, the head end of each phase winding transfers weighing apparatus to throw/cut the phase that control switch connects the distribution transformer secondary side by described electric current in the described three-phase winding element, described by-pass switch and the electric current accent weighing apparatus control interface that is connected the synthetic loss reduction control unit with the control input end that electric current transfers weighing apparatus to throw/cut control switch.Described mode of operation control switch can also be provided with protection switch, and described protection switch is connected on the output of each phase multi-channel gating switch in the described three-phase winding element, with described electric current transfer weighing apparatus throw/to cut control switch synchronous.

Described power distribution network electromagnetic optimization dynamic loss reduction system, the synthetic loss reduction device contains capacitance compensation unit (13), and capacitance compensation unit (13) are connected in parallel in the three-phase four-wire power output circuit of distribution transformer secondary side; Reactive power compensation control output interface (1122) the control connection capacitance compensation unit (13) of synthetic loss reduction controller (11), size according to detected power factor, reactive power, voltage, capacitor's capacity parameter, when power factor not in interval value 0.85～0.95, voltage is no more than preset value (can be set to distribution transformer load voltage value+7% or-10%), and when required reactive power is thrown the appearance value of electric capacity greater than plan, by described compensation control switch the electric capacity of correspondence is put in the electrical network, with the shortage of compensating power, improve power factor; When voltage exceeds preset value or power factor greater than higher limit (can be set to the some numerical value between 0.85～0.95); According to the principle of " throw earlier cut earlier ", or look the principle of emergency " speed is cut ", excise corresponding electric capacity by described compensation control switch.

Described power distribution network electromagnetic optimization dynamic loss reduction system, by described synthetic loss reduction controller (11), voltage parameter according to the distribution transformer secondary side that monitors, when the phase voltage of distribution transformer secondary side be lower than preset value (as rated voltage-10%) time, export corresponding electromagnetism and transfer the weighing apparatus control signal, transfer the weighing apparatus unit to force to cut its " bypass " mode of operation electromagnetism.

Described power distribution network electromagnetic optimization dynamic loss reduction system, synthetic loss reduction controller (11) according to " line loss electric quantity metering model " and " fall and decrease the electric quantity metering model " (revise obtain according to " rms current method ") directly measure branched line copper loss on the distribution transformer primary side 10kV high-tension line, on the metering distribution transformer secondary side 380V low-voltage circuit copper loss, measure the loss on transmission electric weight of distribution transformer self; When the state of synthetic loss reduction device (1) is " bypass ", synthetic loss reduction controller (11) measures the line loss electric weight that obtains distribution transformer first and second side line road copper loss according to line loss electric quantity metering model, when the state of synthetic loss reduction device (1) was " work ", synthetic loss reduction controller (11) was according to falling the line loss electric weight that decreases the metering of electric quantity metering model and obtain distribution transformer first and second side line road copper loss, the loss on transmission electric weight that line drop is decreased electric weight and distribution transformer; Described line loss electric weight and falling decreases electric quantity data and all can or specify constantly constantly " freezing " in the memory cell of synthetic loss reduction controller (11) according to Preset Time temporarily.

The damage system falls in a kind of power distribution network synthesis, constitute power distribution network by N bar 10kV distribution line, every distribution line is mounted with 1 station power distribution transformer at least, the primary side of every station power distribution transformer links to each other with the 10kV distribution line, every station power distribution Circuit Fault on Secondary Transformer output series connection 1 synthetic loss reduction device (1), described synthetic loss reduction device (1) comprises synthetic loss reduction controller (11), electromagnetism is transferred weighing apparatus unit (12), capacitance compensation unit (13), the electromagnetism of synthetic loss reduction controller (11) transfers weighing apparatus control output interface (1121) control connection electromagnetism to transfer weighing apparatus unit (12), reactive power compensation control output interface (1122) control connection capacitance compensation unit (13), electromagnetism transfers the input (121) of weighing apparatus unit (12) to connect the three-phase output end of distribution transformer secondary side, the output (122) that electromagnetism is transferred weighing apparatus unit (12) with link to each other with electric loading; Capacitance compensation unit (13) is connected in parallel in the three-phase circuit of distribution transformer secondary side; Synthetic loss reduction device (1) is connected communication system (2) by communication unit (15) with communication link (24), insert computer network (33) connected system master control platform (3) by communication system (2), data transfer mode comprises " active communication " and " call together to survey and communicate by letter ", the value of setting decision by communications control mode in the synthetic loss reduction controller (11), when synthetic loss reduction controller (11) is operated in " active communication " mode, synthetic loss reduction controller (11) is according to the default time interval, automatically detect the clock when the unification school, according to clock trigger signal, synthetic loss reduction controller (11) sends by the communication unit (15) that is attached thereto the predefined data of uploading automatically to master control platform (3); When synthetic loss reduction controller (11) is operated in " call together and survey communication " mode, synthetic loss reduction controller (11) detects the serial ports that links to each other with communication unit (15) in real time, when receiving master control platform (3) when calling together of sending of communication system (2) surveyed signal, according to the requirement of communication instruction with relevant data loopback.

The damage system falls in described power distribution network synthesis, and communication system (2) is made of the communication server (211), Control on Communication work station (212) and communication link (24); Communication system (2) adopts " multisequencing pattern " to constitute the communication array, and communication task management software (221), communications control software softwares such as (222) are installed respectively, operated on the different computer, connect by network system (33) between them; Described communications control software (222) adopts " multithreading " mode to support to receive synchronously the high capacity communication task of handling.

Communication system (2) is supported many modes of communication systems, supports the GPRS standard of China Mobile, also supports the CDMA standard of CHINAUNICOM, also supports the wireless digital broadcasting station communication pattern of autonomous networking; Communication unit can adopt the JC8600 communication module (GPRS DTU) of wound Science and Technology Ltd. of Henan army.

The damage system falls in described power distribution network synthesis, and system master platform (3) is made of system server (311), data server (312), WEB server (313), system operation Control work station (314), system remote maintenance work station (315), warning work station (316), computer network (33) and multiple-way feed system (34); System master platform (3) adopts " multisequencing pattern " to constitute the main website array, system server (311), data server (312), WEB server (313), operation Control work station (314), remote maintenance work station (315), warning work station (316) adopts different computers as hardware platform, operation control software (321), system configuration parameter storehouse (322), WEB information releasing software (315), alarm processing software (324), remote maintenance management software (325) and line loss automatic generating software (326) are installed respectively, operate on the different equipment; Described line loss automatic generating software (326) calculates the line loss electric weight of every distribution line in power distribution network and the power distribution network automatically and falls the damage electric weight according to " trend method " or other computational methods, falls loss rate and energy-saving and emission-reduction benefit according to falling the calculating of damage electric weight; The user of described WEB information releasing software (315) in network provides " sharing " of relevant data.

The damage system falls in described power distribution network synthesis, and communication system (2) and system master platform (3) all can adopt " unit mode of operation ", and communication task management software (221), Control on Communication Control Software (222) are installed, operated on the computer; Operation control software (321), system configuration parameter storehouse (322), WEB information releasing software (315), alarm processing software (324), remote maintenance management software (325) and line loss automatic generating software (326) are installed, are operated on the computer.

The damage system of falling power distribution network synthesis adopts multiple-way feed system (34) to fall the communication server (211) in the damage system to power distribution network synthesis, Control on Communication work station (212), system server (311), data server (312), WEB server (313), operation Control work station (314), system remote maintenance work station (315), warning work station (316), equipment such as the network switch provide electrical source of power, multiple-way feed system (34) is by being made of normal electricity electric power system and uninterrupted backup power system, adopt the power supply system power supply under the normal condition, when power supply system " powers failure " etc. occur and can't power, automatically switch to uninterrupted back-up source electric power system to power; Power supply system goes back to normal power supply again after recovering normally automatically.

Good effect of the present invention:

1, power distribution network synthesis of the present invention falls the damage system and can be widely used in the power distribution network, by dynamic adjustment to the distribution transformer running status, reduce the own loss of distribution transformer in real time, reduce the line loss on the distribution transformer first and second side line road, realize the synthetic loss reduction of power distribution network, fall that to decrease effect remarkable.

1) by special process structure the three-phase imbalance electric current is dynamically formed " electromagnetism containing " and harmonic wave is drawn up, phase current difference to the three-phase imbalance electric current is carried out " peak load shifting ", reduce difference between current, make it the dynamic equilibrium of three-phase imbalance trend, reach and improve tri-phase unbalance factor, reduce zero-sequence current, reduce neutral point drifting, realize dynamically reducing the purpose of distribution transformer loss on transmission.

Can see from Fig. 6-1, Fig. 6-3:

A) phase current " difference " of three-phase current is significantly less than the phase current " difference " of three-phase current under " bypass " state under " work " state, and promptly falling damage device has tangible regulating power to the three-phase imbalance electric current.

B) the three-phase electricity flow valuve is significantly less than three-phase electricity flow valuve under " bypass " state under " work " state, and promptly falling unit has the ability that reduces distribution transformer first and second side line road copper loss.

C) the zero-sequence current value is significantly less than zero-sequence current value under " bypass " state under " work " state, promptly falls damage device and has the ability that reduces zero-sequence current.

Can see from Fig. 6-2:

" difference " under " work " state between the three-phase voltage is significantly less than " difference " between the three-phase voltage under " bypass " state, promptly falls damage device and has the three-phase imbalance of adjustment ability.

As seen from Figure 7:

The three-phase electricity flow valuve is less than the three-phase electricity flow valuve under " bypass " state under " work " state, the difference amplitude of the phase current of three-phase current is less than the difference amplitude of the phase current of three-phase current under " bypass " state under " work " state, and the zero-sequence current value is less than the zero-sequence current value under " bypass " state under " work " state.Be that the synthetic loss reduction device has the ability of regulating three-phase imbalance, have the ability that reduces circuit copper sweet-smelling grass, have the ability that reduces zero-sequence current.

2) organize the electric parameter real time data of synchronous acquisition unit dynamic acquisition by multichannel more, according to " line loss dynamic calculation model " but the line loss electric weight of automatic gauge, statistics distribution transformer first and second side and fall the damage electric weight.Realize the synchronous measurement of all distribution transformer losses and line loss in the power distribution network, and then realize statistics, the calculating of the synthetic loss reduction effect of every distribution line and power distribution network.

3) " local data freezes in real time " function by the synthetic loss reduction controller, by the Modern wireless communication technology, can obtain the operational factor and the line loss statistics of each distribution transformer at any time synchronously, realize synchronism, accuracy and the reliability of statistics line loss, and the automaticity of line loss generation, the measuring accuracy of raising line loss.

4), adopt alarm processing software (325) to relevant fault automatic location and the automatic alert literary composition of reporting to the police that forms, with SMS by alarm mechanism and warning model, or phone, or fax, or mode such as the network information sends alarm condition report to relevant person liable, reminds and handles.Type of alarm and alarm content comprise:

A) according to the equipment state of on-line monitoring, automatically position, nature of trouble, the fault time of fault location equipment, hinder processing speed to accelerate row.

B) distribution transformer of automatic screening running status " data exception ", the generation of preventing accident ahead of time.

C) automatic screening is operated in the distribution transformer in " overload " or " non-economy operation areas " such as " underloadings ", for the construction of power distribution network and adjustment provide the science decision-making foundation of " layouting ".

Model machine of the present invention is through the actual linked network test of " the public distribution transformer " of actual linked network test, factory testing and Liaoning electric company of " user's distribution transformer " more than 1 year, and the linked network measured data shows:

1) loss on transmission (distribution transformer own loss) range of decrease is 1.73%～32.02%

2) the 380V line loss range of decrease 12.6%～36.92%

3) the 10kV line loss range of decrease 2.54%～67.55%

According to relevant line loss distribution proportion in the existing document, can extrapolate system synthesis that the damage system falls in power distribution network synthesis by above-mentioned experiment conclusion and fall loss rate and reach 2.8%～18.96%[and see Figure 10, Figure 11].

2. applying of damage method and system dynamically falls in power distribution network of the present invention will be made factors such as three characteristics of the middle term laod unbalance, harmonic pollution cause in the power distribution network technology line loss be effectively controlled and reduce, and will obtain huge economic benefit and environmental benefit.The state basic policy that meets " energy-saving and emission-reduction " reduces discharging remarkable benefit.The electric energy loss that the objective of the invention is to be wasted in the power distribution network " is retrieved ".The popularization of this technology does not need to change the power distribution network existing structure, it is the new technology of an investment instant effect, not only directly " energy-conservation " but also significant " reduction of discharging " effect is arranged meets the state basic policy of " energy-saving and emission-reduction ", is applied to power supply enterprise and will produces significant direct economic benefit and social benefit widely.The benefit of " the damage system falls in power distribution network synthesis " not only is embodied in the line loss in the direct reduction power distribution network, and consequent energy-conservation (consuming coal, few water consumption less) reduces discharging and (reduce CO ₂, SO ₂Discharging) benefit is also very remarkable.

Popularize in an all-round way and use " the damage system falls in power distribution network synthesis ", only calculate according to electricity sales amount and the line loss rate of 2007 21200000000 kWh of Henan electric company, can save energy loss 1.04 hundred million kWh/, be equivalent to save 5.2 ten thousand tons/year of standard coals, reduce 13.8 ten thousand tons/year of CO2 emissions (according to the CDM project demand, its Emission Right can be sold in the world), reduce 8,570,000 tons/year of water consumptions, obtain 1.41 hundred million yuan/year comprehensive income; Electricity sales amount and line loss rate measuring and calculating according to its 2007 1345.6 hundred million kWh of Henan Electric Power Company, can save energy loss 4.94 hundred million kWh/, be equivalent to save 18.5 ten thousand tons/year of standard coals, reduce 49.2 ten thousand tons/year of carbon dioxide (CO2) dischargings, reduce 2,554 ten thousand tons/year of water consumptions, can obtain 4.95 hundred million yuan/year comprehensive income [seeing Figure 12].

3. the damage system falls in power distribution network synthesis of the present invention can be directly used in the energy-saving and cost-reducing of " user transformers ", and power savings is obvious.Can effectively suppress harmonic effects, dynamically adjust three-phase imbalance, reduce zero-sequence current, reduce the loss on transmission of user transformers, the copper loss on the reduction 380V low-voltage circuit effectively, simultaneously, also reduced the copper loss on the 10kV circuit, for the user provides tangible power savings.

4. power distribution network synthesis of the present invention falls the damage system and has the huge market space and the development prospect that the damage rising industry falls in technology of formation." the damage system falls in power distribution network synthesis " is mainly used in the power distribution network of power supply industry, and promptly the end of electrical network is an effective object with distribution line and distribution transformer.It is the constant of the distribution transformer of existing installation and operation in the electrical network and along with the increment of the annual distribution transformer with the speed cumulative year after year new clothes more than 10% of urbanization development has constituted the huge damage market space of falling.

Initial estimate, the existing about 4,000,000,000 yuan static market, Henan Province and tens yuan the supporting market space.It is different that the market scale of other each province is looked the difference in its economic development level and Henan Province, and the damage market space falls in the existing static state that exceeds 100 billion in the whole nation.Therefore, applying of " the damage system falling in power distribution network synthesis " will form the rising industry that damage falls in a huge technology, promotes the development of economy.

Four, description of drawings

Fig. 1: electromagnetic optimization dynamic loss reduction system configuration schematic diagram of the present invention

Fig. 2: electromagnetic optimization dynamic loss reduction system synthesis of the present invention is fallen and is decreased controller signals collection position schematic diagram

Fig. 3: power distribution network synthesis of the present invention falls and decreases the system configuration schematic diagram

Fig. 4: power distribution network synthesis falls and decreases system communication system configuration schematic diagram

Fig. 5: power distribution network synthesis falls and decreases system master platform structure schematic diagram

Fig. 6-1: fall the 315KVA device primary side day current curve diagram that decreases effect comparison analytic curve figure

Fig. 6-2: fall the 315KVA device secondary side day voltage curve that decreases effect comparison analytic curve figure

Fig. 6-3: fall the 315KVA device secondary side day current curve diagram that decreases effect comparison analytic curve figure

Fig. 7: fall the 630KVA device secondary side day current curve diagram that decreases effect comparison analytic curve figure

Fig. 8: Zhengzhou electric company part distribution transforming service data monitoring and statistics table (Data Source: distribution transforming monitoring total management system) in 2007

Fig. 9: Zhengzhou 200kVA distribution transformer monitoring service data statistical form (in January, 08)

Figure 10: 315kVA device linked network experiment synthetic loss reduction effect analysis summary sheet

Figure 11: 630kVA device linked network experiment synthetic loss reduction effect analysis summary sheet

Figure 12: power distribution network synthesis falls the damage system and falls the damage comprehensive benefit analysis

Five, embodiment

Embodiment one: present embodiment is a kind of execution mode of power distribution network electromagnetic optimization dynamic loss reduction method, transfer the weighing apparatus unit by secondary side output series connection electromagnetism at distribution transformer, the electromagnetism here transfers the weighing apparatus unit to comprise cross-over connection, mix the three-phase winding element that is wound on three groups of magnetic posts that are overrided to form by silicon steel or silicon steel sheet, the series connection that each of three-phase winding element all comprises some mutually is wound on two coils on the adjacent magnetic post, two one on adjacent magnetic posts are body magnetic post, another is a cross-over connection magnetic post, coil on the body magnetic post adopts the clockwise direction coiling, coil on the cross-over connection magnetic post adopts coiling counterclockwise, and its coil turn calculates according to falling the damage amplitude requirement; The head end of each phase winding connects a phase of distribution transformer secondary side in the three-phase winding element, and the terminal of each phase winding all links to each other mutually with the zero line N of distribution transformer secondary side; Each phase winding of three-phase winding element has the access point of a plurality of leading points as this phase load, draw the load output that connects distribution transformer through multi-channel gating switch on the body magnetic post winding coil of the access point of every phase load by its place, key of the present invention is: according to detected three-phase current signal, when the threephase load imbalance appears in the load output of distribution transformer, size according to the threephase load degree of unbalance is passed through multi-channel gating switch, big certain of phase current is added to a negative fluxfield with former FR, with former magnetic field offset to reduce this magnetic flux mutually, reduce phase current; Simultaneously, to little certain of phase current apply mutually one with former magnetic field positive flux field in the same way, with former magnetic field superposition to increase this magnetic flux mutually, increase this phase current, realization is carried out " peak load shifting " processing to three-phase current, and it is poor to reduce phase current, finishes the real-time adjustment of three-phase imbalance electric current, make it dynamically to tend to relative equilibrium, reduce zero-sequence current.

Handle by dynamically the three-phase imbalance electric current being carried out " peak load shifting ", reduce distribution transformer output tri-phase unbalance factor, reduce the centerline skew, can reach the copper loss that reduces on the distribution transformer secondary side 380V low-voltage circuit, reduce the purpose of the own loss of distribution transformer, and then can reduce copper loss on the distribution transformer primary side 10kV high-tension line, reduce the copper loss of distribution line and the line loss of power distribution network.

Application principle of the present invention is: adopt " adjacent magnetic post differential concatenation cross-over connection winding " special structure, make full use of the relation and the characteristic of electricity and interdependent each other, the mutual containing of magnetic, dynamically realize " magnetic potential balance ", difference between current to the three-phase imbalance electric current carries out " peak load shifting ", it is poor to reduce phase current, make it the three-phase imbalance electric current and dynamically tend to be balanced, reach and reduce zero-sequence current, reduce tri-phase unbalance factor.Basis standard GB/the T15543-1995 of tri-phase unbalance factor " three-phase voltage permission degree of unbalance " carries out.

Embodiment two: the present embodiment power distribution network electromagnetic optimization dynamic loss reduction method has increased the capacitance compensation unit on the basis of embodiment one.By parallel capacitive compensation unit in the three-phase circuit of distribution transformer secondary side output, size according to detected power factor, reactive power, voltage, capacitor's capacity parameter, when power factor not in interval value 0.85～0.95, voltage is no more than preset value (can be set to transformer load voltage value+7% or-10%), and when required reactive power is thrown the appearance value of electric capacity greater than plan, by described compensation control switch the electric capacity of correspondence is put in the electrical network, with the shortage of compensating power, improve power factor; When voltage exceeds preset value or power factor greater than higher limit 0.95, excise corresponding electric capacity according to the principle of " throw earlier and cut earlier " by the compensation control switch; Or look the principle that emergency is taked " speed is cut ", force the corresponding electric capacity of excision.

Embodiment three: referring to Fig. 1, Fig. 2.Present embodiment power distribution network electromagnetic optimization dynamic loss reduction system, contain the synthetic loss reduction device 1 in the output circuit that is connected on the distribution transformer secondary side, synthetic loss reduction device 1 comprises synthetic loss reduction controller 11, electromagnetism accent weighing apparatus unit 12, wherein the electromagnetism of synthetic loss reduction controller 11 transfers weighing apparatus control output interface 1121 to transfer weighing apparatus unit 12 by transferring weighing apparatus control interface 141 control connection electromagnetism, electromagnetism transfers the input 121 of weighing apparatus unit 12 to connect the three-phase output end of distribution transformer secondary sides, the output 122 that electromagnetism is transferred weighing apparatus unit 12 with link to each other with electric loading; Described synthetic loss reduction device 1 contains multichannel electric parameter signal synchronous collection unit, respectively on the synchronous acquisition distribution transformer primary side 10kV circuit, synthetic loss reduction device 1 input side, the three-phase voltage of outlet side, the current signal and the synthetic loss reduction device 1 of flowing through 3 the tunnel in all or part of zero sequence current signal input synthetic loss reduction controller 11, synthetic loss reduction controller 11 calculates the tri-phase unbalance factor of distribution transformer secondary side, when tri-phase unbalance factor during greater than preset value 2%, perhaps according to the size of the zero-sequence current of distribution transformer secondary side, when zero-sequence current greater than the distribution transformer rated current 10% the time (this value also can be set to 15%, 20% or 25% etc., export corresponding electromagnetism and transfer the weighing apparatus control signal, transfer weighing apparatus unit 12 to drop into electromagnetism and be " mode of operation ", otherwise, then electromagnetism is transferred weighing apparatus unit 12 to cut its " bypass " mode of operation.

Wherein multichannel electric parameter signal synchronous collection unit is made of interface circuit, sample/hold circuit, multichannel genlock circuit, high-precision A/D conversion, data conditioning circuit, multichannel electric parameter signal through instrument transformer, sample/hold circuit, multichannel genlock circuit, amplify transfer 0 circuit, high-precision A/D conversion after, digital signal is input to the synthetic loss reduction controller to be converted to voltage, electric current, differ etc.

Embodiment four: referring to Fig. 1, Fig. 2.What present embodiment power distribution network electromagnetic optimization dynamic loss reduction system and embodiment one were different is: the synthetic loss reduction device contains capacitance compensation unit 13, and capacitance compensation unit 13 is connected in parallel in the three-phase four-wire power output circuit of distribution transformer secondary side; The reactive power compensation control output interface 1122 control connection capacitance compensation unit 13 of synthetic loss reduction controller 11, synthetic loss reduction controller 11 is according to the size of detected power factor, reactive power, voltage, capacitor's capacity parameter, when power factor not in interval value 0.85～0.95, voltage is no more than preset value (can be set to transformer rated voltage+7% or-10%), and when required reactive power is thrown the appearance value of electric capacity greater than plan, by described compensation control switch the electric capacity of correspondence is put in the electrical network, with the shortage of compensating power, improve power factor; Or when voltage exceeds preset value or power factor greater than higher limit 0.95,, excise corresponding electric capacity by the compensation control switch according to the principle of " throw earlier and cut earlier "; Or look the principle that emergency is taked " speed is cut ", force the corresponding electric capacity of excision.

Above-mentioned two embodiment power distribution network electromagnetic optimization dynamic loss reduction systems, synthetic loss reduction controller 11 can be according to the voltage parameter of the distribution transformer secondary side that monitors, when the phase voltage of distribution transformer secondary side be lower than preset value distributor rated voltage-10% the time, export corresponding electromagnetism and transfer the weighing apparatus control signal, transfer the weighing apparatus unit to force to cut its " bypass " mode of operation electromagnetism.

Power distribution network electromagnetic optimization dynamic loss reduction of the present invention system, synthetic loss reduction controller 11 according to " line loss electric quantity metering model " and " fall and decrease the electric quantity metering model " (revise obtain according to " rms current method ") directly measure branched line copper loss on the distribution transformer primary side 10kV high-tension line, on the metering distribution transformer secondary side 380V low-voltage circuit copper loss, measure the loss on transmission electric weight of distribution transformer self; When the state of synthetic loss reduction device (1) is " bypass ", synthetic loss reduction controller 11 measures the line loss electric weight that obtains distribution transformer first and second side line road copper loss according to line loss electric quantity metering model, when the state of synthetic loss reduction device 1 was " work ", synthetic loss reduction controller 11 was according to falling the line loss electric weight that decreases the metering of electric quantity metering model and obtain distribution transformer first and second side line road copper loss, the loss on transmission electric weight that line drop is decreased electric weight and distribution transformer; Described line loss electric weight and falling decreases electric quantity data and all can or specify constantly constantly " freezing " in the memory cell of synthetic loss reduction controller 11 according to Preset Time temporarily.Wherein line loss electric quantity metering model is as follows

XSDL = Σ_{k = 1}^{n} ΔAk + BSDL - - - (1)

BSDL＝P1-P2 (2)

ΔA＝ξ*I ²jf*R*t×10 ^-3 (3)

In the formula:

1) XSDL: line loss electric weight, kWh;

2) BSDL: loss on transmission electric weight, kWh;

3) P1: distribution transformer primary side electric weight (10kV high-pressure side), kWh;

4) P2: distribution transformer secondary side electric weight (380V low-pressure side), kWh;

5) Δ A: line loss electric weight (copper loss electric weight), kWh;

6) ξ: state parameter, 1--device are in " work " state, the 0--device is in " bypass " state;

7) I ²Jf: rms current, A;

8) R: the resistance of element, Ω;

9) t: running time, h;

10) Δ A1 (k=1): 10kV high-pressure side circuit copper loss, kWh;

11) Δ A2 (k=2): 380V low-pressure side circuit copper loss, kWh.

It is as follows to fall damage electric quantity metering model

JSDL = {\frac{λ}{1 - λ}} * XSDL - - - (4)

In the formula:

1) the damage electric weight falls in JSDL-, kWh, ξ=0 o'clock, JSDL=0, ξ=1 o'clock, JSDL＞0;

2) XSDL--line loss electric weight, kWh;

3) λ--fall the damage coefficient, depend on the damage amplitude of falling of synthetic loss reduction device, span: (0～1).

The mode of operation control switch of electromagnetism accent weighing apparatus unit comprises distribution transformer synthetic loss reduction device by-pass switch and transfers weighing apparatus to throw/cut control switch with the electric current of described by-pass switch mutual exclusion in the synthetic loss reduction device, the head end of each phase winding transfers weighing apparatus to throw/cut the phase that control switch connects the distribution transformer secondary side by described electric current in the described three-phase winding element, described by-pass switch and the electric current accent weighing apparatus control interface that is connected the synthetic loss reduction control unit with the control input end that electric current transfers weighing apparatus to throw/cut control switch.Described mode of operation control switch can also be provided with protection switch, and described protection switch is connected on the output of each phase multi-channel gating switch in the described three-phase winding element, with described electric current transfer weighing apparatus throw/to cut control switch synchronous.Content about synthetic loss reduction device and electromagnetism accent weighing apparatus unit, capacitance compensation unit and synthetic loss reduction controller in the existing argumentation of this case inventor's utility application " a kind of distribution transformer synthetic loss reduction device ", here no longer describes in detail.

Embodiment five: referring to Fig. 3, Fig. 4, Fig. 5, the present embodiment power distribution network synthesis falls the damage system and constitutes power distribution network by N bar 10kV distribution line, every distribution line is mounted with 1 station power distribution transformer at least, the primary side of every station power distribution transformer links to each other with the 10kV distribution line, 1 synthetic loss reduction device 1 of every station power distribution Circuit Fault on Secondary Transformer output series connection, the electromagnetism of synthetic loss reduction device 1 transfers the input of weighing apparatus unit to connect the three-phase output end of distribution transformer secondary side, the output that electromagnetism is transferred the weighing apparatus unit with link to each other with electric loading; The capacitance compensation unit is connected in parallel in the three-phase circuit of distribution transformer secondary side; Wherein synthetic loss reduction device 1 is connected with communication system 2 with communication link 24 by communication unit 15, inserts computer network 33 connected system master control platforms 3 by communication system 2, and described data transfer mode comprises active communication and communicates by letter with calling together to survey; Data transfer mode is by the value of the setting decision of communications control mode in the synthetic loss reduction controller 11, when synthetic loss reduction controller 11 is operated in " active communication " mode, synthetic loss reduction controller 11 according to preset time at interval, automatically detect the clock when the unification school, according to clock trigger signal, synthetic loss reduction controller 11 is uploaded relevant data according to predefined data type automatically, sends to master control platform 3 by the communication unit 2 that is attached thereto; When synthetic loss reduction controller 11 is operated in " call together and survey communication " mode, synthetic loss reduction controller 11 detects its serial ports that links to each other with communication unit 15 in real time, when receiving master control platform 3 when calling together of sending of communication system 2 surveyed signal, according to the requirement of communication instruction with relevant data loopback.

Referring to Fig. 4, communication system 2 is made of communication unit 15, the communication server 211, Control on Communication work station 212, communication interface 23 and communication link 24; Communication system 2 adopts " multisequencing pattern " to constitute the communication array, and softwares such as communication task management software 221, communications control software 222 are installed respectively, operated on the different computers, connects by network system 33 between them; Described communications control software 222 adopts modes such as " multithreadings " to support to receive synchronously the high capacity communication task of handling.Communication system 2 also can adopt " unit mode of operation " as one sees fit, and communication task management software 221, Control on Communication Control Software 222 are installed, operated on the computer.

Control on Communication work station 212 is installed and the operational communications Control Software, and the teledata that is installed in the communication unit 15 in the synthetic loss reduction device in the power distribution network is scattered in transmitting-receiving; By network interface card, the network switch, read the effective task in the communication task formation, generate communication instruction according to the particular communication stipulations, and outwards send by communication interface, be installed in distribution that the communication unit in the synthetic loss reduction device 15 carries out telecommunication in the power distribution network, the relevant data in the long-range copy reading synthetic loss reduction controller 11.Described communication system 2 is supported many modes of communication systems, supports the GPRS standard of China Mobile, also supports the CDMA standard of CHINAUNICOM, also supports the wireless digital broadcasting station communication pattern of autonomous networking.Communication unit can adopt the JC8600 communication module (GPRS DTU) of wound Science and Technology Ltd. of Henan army.

By communication system, realized the synchronization electric quantity data of each distribution transformer that the remote auto copy reading is obtained when the unification school, guaranteed line loss metering, statistical accuracy and synchronization, eliminate because of the influence of time error of checking meter the line loss metering.

Referring to Fig. 5, system master platform 3 is made of system server 311, data server 312, WEB server 313, system operation Control work station 314, system remote maintenance work station 315, warning work station 316, computer network 33 and multiple-way feed system 34; System master platform 3 adopts " multisequencing pattern " to constitute the main website array, system server 311, data server 312, WEB server 313, operation Control work station 314, remote maintenance work station 315, warning work station 316 adopt different computers as hardware platform, and operation control software 321, system configuration parameter storehouse 322, WEB information releasing software 315, alarm processing software 324, remote maintenance management software 325 and line loss automatic generating software 326 operate in respectively on the different equipment; Line loss automatic generating software 326 calculates the line loss electric weight of every distribution line in power distribution network and the power distribution network automatically and falls the damage electric weight according to " trend method " or according to other computing formula, falls loss rate and energy-saving and emission-reduction benefit according to falling the calculating of damage electric weight; The user of WEB information releasing software 315 in network provides " sharing " of the various information datas of relevant power distribution network, the user of mode in network system with browser provides by the running status (voltage of inquiry distribution transformer, electric current, power factor, active power, reactive power, electric weight, electric parameter data such as harmonic wave), line loss situation (the loss on transmission of inquiry period, one, copper loss on the secondary side circuit) and fall and decrease effect (the loss on transmission range of decrease, one, the copper loss range of decrease on the secondary side circuit), statistics is provided by the line loss situation of change of inquiry distribution line, print the line loss situation in the power distribution network and fall forms such as decreasing effect.

Power distribution network synthesis of the present invention falls and decreases system data framework employing C/S structure (Client/Server, Client), with the stability of speed up processing and raising system; B/S structure (Browser/Server, browser/server pattern) is adopted in the issue of WEB information, with the requirement of reduction system to environment for use.

Wherein system server 311 provides the work support environment of system master platform 3; System configuration parameter storehouse 322 comprises characteristic parameters such as the numbering, bar number of the distribution transformer of having jurisdiction over, affiliated distribution line, position, capacity, manager, load overview, it is the basic data that the damage system falls in power distribution network synthesis, data server 312 adopts power industry to specify special-purpose oracle database platform, also can adopt SQL Server database platform, also can adopt the sybase database platform; WEB server 313 adopts the IIS systems, and the user in network provides the operational environment of services such as the inquiry, statistics, printing of relevant distribution transformer.

The human-machine operation environment that operation Control work station 314 mainly provides relevant power distribution network synthesis to fall damage system 4, the management maintenance, line loss management that Operation and Maintenance, the communication task in system configuration parameter storehouse 322 be provided with statistics, functions such as decreasing statistical effect and analysis, alarming and managing and maintenance, report printing fall;

Install on the remote maintenance work station 315 and operation remote maintenance management software 325, the remote maintenance support function is provided, identity is carried out in user's request of Telnet screens, the user who meets the demands gives the corresponding function of remote operating system according to authority, guarantee promptness and convenience that system maintenance is supported, refusal " disabled user " guarantees the reliability and the fail safe of system to every operations such as the visit of system, inquiry, additions and deletions.

Install on the warning work station 316 and operation alarm processing software 324, automatically obtain terminal data in the database server by network interface card, netting twine, the network switch, according to detected equipment running status in the prediction scheme automatic checkout system, wait unusual or electric parameter data appearance " exceeding standard " etc. when unusual when discovering device " stops " operation, " gate inhibition is out of control ", produce warning message automatically; Alarm processing software 324 is according to the order of importance and emergency grade of alert, automatically with relevant warning message with mobile phone short messages, be sent on responsible person concerned's the mobile phone, finish warning, relevant warning message or adopt phone, fax or network information mode to send.

The damage system falls in power distribution network synthesis of the present invention, adopt multiple-way feed system 34 to fall the communication server 211 in the damage system to power distribution network synthesis, Control on Communication work station 212, system server 311, data server 312, WEB server 313, operation Control work station 314, remote maintenance work station 315, warning work station 316, equipment such as the network switch provide electrical source of power, multiple-way feed system 34 is made of normal electricity electric power system and uninterrupted backup power system, adopt the power supply system power supply under the normal condition, when power supply system " powers failure " etc. occur and can't power, automatically switch to uninterrupted back-up source electric power system to power; Power supply system goes back to normal power supply again after recovering normally automatically.

Claims

1, a kind of power distribution network electromagnetic optimization dynamic loss reduction method, secondary side output series connection electromagnetism at distribution transformer is transferred the weighing apparatus unit, described electromagnetism transfers the weighing apparatus unit to comprise cross-over connection, mix and be wound on three groups of three-phase winding elements on the magnetic post, each of three-phase winding element all comprises a certain number of series connection mutually and is wound on two coils on the adjacent magnetic post, two one on adjacent magnetic posts are body magnetic post, another is a cross-over connection magnetic post, coil on the body magnetic post adopts the clockwise direction coiling, coil on the cross-over connection magnetic post adopts coiling counterclockwise, and coil turn calculates according to falling the damage amplitude requirement; The head end of each phase winding connects a phase of distribution transformer secondary side in the described three-phase winding element, and the end of each phase winding all connects the zero line N phase of distribution transformer secondary side; Each phase winding of three-phase winding element has the access point of a plurality of leading points as this phase load, draw the load output that connects distribution transformer through multi-channel gating switch on the body magnetic post winding coil of the access point of every phase load by its place, it is characterized in that: according to detected three-phase current signal, when the threephase load imbalance appears in the load output of distribution transformer, size according to the threephase load degree of unbalance is passed through multi-channel gating switch, big certain of phase current is added to a negative fluxfield with former FR, with former magnetic field " offset " to reduce this magnetic flux mutually, reduce phase current; Simultaneously, to little certain of phase current apply mutually one with former magnetic field positive flux field in the same way, with former magnetic field " stack " to increase this magnetic flux mutually, increase this phase current, realize that three-phase current is carried out " peak load shifting " to be handled, it is poor to reduce phase current, finish the real-time adjustment of three-phase imbalance electric current, make it dynamically to tend to relative equilibrium, reduce zero-sequence current, and then reduce the copper loss on loss on transmission and the first and second side line road.

2, power distribution network electromagnetic optimization dynamic loss reduction method according to claim 1, it is characterized in that: in the three-phase circuit of distribution transformer secondary side output, be parallel with the capacitance compensation unit, described capacitance compensation unit is by power capacitor, the compensation control switch constitutes, according to detected power factor, reactive power, voltage, the size of capacitor's capacity parameter, when power factor is not being set interval value [0.85,0.95] in, voltage is no more than the preset value upper limit, and when required reactive power is thrown the appearance value of electric capacity greater than plan, by described compensation control switch the electric capacity of correspondence is put in the electrical network, reactive power so that compensation lacks improves power factor; When voltage exceeds preset value or power factor when setting the higher limit of interval value, by described compensation control switch according to " throw earlier and cut earlier " or the corresponding electric capacity of " speed is cut " principle excision; Following-10% of the transformer rated voltage that is limited to of voltage preset value, on be limited to the transformer rated voltage+7%.

3, a kind of power distribution network electromagnetic optimization dynamic loss reduction system, contain the synthetic loss reduction device (1) in the output circuit that is connected on the distribution transformer secondary side, described synthetic loss reduction device comprises synthetic loss reduction controller (11), electromagnetism accent weighing apparatus unit (12), wherein the electromagnetism of synthetic loss reduction controller (11) transfers weighing apparatus control output interface (1121) control connection electromagnetism to transfer weighing apparatus unit (12), electromagnetism transfers the input (121) of weighing apparatus unit (12) to connect the three-phase output end of distribution transformer secondary side, the output (122) that electromagnetism is transferred weighing apparatus unit (12) with link to each other with electric loading; It is characterized in that: described synthetic loss reduction device (1) contains multichannel electric parameter signal synchronous collection unit, distinguishes on the synchronous acquisition distribution transformer primary side 10kV high-tension line and all or part of zero sequence current signal input synthetic loss reduction controller (11) in 3 road zero-sequence currents of synthetic loss reduction device (1) input side and three-phase voltage, the current signal of outlet side and the synthetic loss reduction device (1) of flowing through; Synthetic loss reduction controller (11) calculates the tri-phase unbalance factor of distribution transformer secondary side, when tri-phase unbalance factor during greater than preset value 2%, perhaps according to the size of the zero-sequence current of distribution transformer secondary side, when zero-sequence current during greater than the some percentage of distribution transformer rated current, the corresponding electromagnetism of synthetic loss reduction controller (11) output is transferred the weighing apparatus control signal, transfer weighing apparatus unit (12) to drop into electromagnetism and be " mode of operation ", otherwise, then transfer weighing apparatus unit (12) to cut its " bypass " mode of operation electromagnetism; Wherein the preset value of distribution transformer zero-sequence current is set to the some percent value more than 10% of distribution transformer load current value.

4, power distribution network electromagnetic optimization dynamic loss reduction according to claim 3 system, it is characterized in that: the synthetic loss reduction device contains capacitance compensation unit (13), and capacitance compensation unit (13) are connected in parallel in the three-phase four-wire power output circuit of distribution transformer secondary side; Reactive power compensation control output interface (1122) the control connection capacitance compensation unit (13) of synthetic loss reduction controller (11), synthetic loss reduction controller (11) is according to the size of detected power factor, reactive power, voltage, capacitor's capacity parameter, when power factor is not being set interval value [0.85,0.95] in, voltage is no more than preset value, and when required reactive power is thrown the appearance value of electric capacity greater than plan, by the compensation control switch electric capacity of correspondence is put in the electrical network, with the shortage of compensating power, improve power factor; When voltage exceeds preset value or power factor greater than higher limit, by the compensation control switch according to " throw earlier and cut earlier " or the corresponding electric capacity of " speed is cut " principle excision; Following-10% of the transformer load voltage value that is limited to of voltage preset value, on be limited to the transformer load voltage value+7%.

5, according to claim 3 or 4 described power distribution network electromagnetic optimization dynamic loss reduction systems, it is characterized in that: synthetic loss reduction controller (11) is according to the voltage parameter of the distribution transformer secondary side that monitors, when the phase voltage of distribution transformer secondary side is lower than preset value, export corresponding electromagnetism and transfer the weighing apparatus control signal, transfer the weighing apparatus unit to force to cut its " bypass " mode of operation electromagnetism.

6, according to claim 3 or 4 described power distribution network electromagnetic optimization dynamic loss reduction systems, it is characterized in that: synthetic loss reduction controller (11) according to revise by " rms current method " " the line loss electric quantity metering model " and " fall and decrease the electric quantity metering model " that obtain directly measure branched line copper loss on the distribution transformer primary side 10kV high-tension line, on the metering distribution transformer secondary side 380V low-voltage circuit copper loss, measure the loss on transmission electric weight of distribution transformer self; When the state of synthetic loss reduction device (1) is " bypass ", synthetic loss reduction controller (11) measures the line loss electric weight that obtains distribution transformer first and second side line road copper loss according to line loss electric quantity metering model, when the state of synthetic loss reduction device (1) was " work ", synthetic loss reduction controller (11) was according to falling the line loss electric weight that decreases the metering of electric quantity metering model and obtain distribution transformer first and second side line road copper loss, the loss on transmission electric weight that line drop is decreased electric weight and distribution transformer; The line loss electric weight that obtains of metering and falling decreases electric quantity data according to Preset Time or specify constantly " freezing " in the memory cell of synthetic loss reduction controller (11) temporarily.

7, power distribution network electromagnetic optimization dynamic loss reduction according to claim 6 system is characterized in that: " line loss electric quantity metering model " and " fall and decrease the electric quantity metering model " is as follows:

" line loss electric quantity metering model ":

XSDL = Σ_{k = 1}^{n} ΔAk + BSDL - - - (1)

BSDL＝P1-P2 (2)

ΔA＝ξ*I ²jf*R*t×10 ^-3 (3)

Wherein:

1) XSDL: line loss electric weight, kWh;

2) BSDL: loss on transmission electric weight, kWh;

5) Δ A: line loss electric weight (copper loss electric weight), kWh;

7) I ²Jf: rms current, A;

8) R: the resistance of element, Ω;

9) t: running time, h;

10) Δ A1 (k=1): 10kV high-pressure side circuit copper loss, kWh;

11) Δ A2 (k=2): 380V low-pressure side circuit copper loss, kWh;

" fall and decrease the electric quantity metering model ":

JSDL = {\frac{λ}{1 - λ}} * XSDL - - - (4)

Wherein:

2) XSDL--line loss electric weight, kWh;

8, the damage system falls in a kind of power distribution network synthesis, constitute power distribution network by N bar 10kV distribution line, every distribution line is mounted with 1 station power distribution transformer at least, the primary side of every station power distribution transformer links to each other with the 10kV distribution line, every station power distribution Circuit Fault on Secondary Transformer output series connection 1 synthetic loss reduction device (1), described synthetic loss reduction device (1) comprises synthetic loss reduction controller (11), electromagnetism is transferred weighing apparatus unit (12), capacitance compensation unit (13), the electromagnetism of synthetic loss reduction controller (11) transfers weighing apparatus control output interface (1121) control connection electromagnetism to transfer weighing apparatus unit (12), reactive power compensation control output interface (1122) control connection capacitance compensation unit (13), electromagnetism transfers the input (121) of weighing apparatus unit (12) to connect the three-phase output end of distribution transformer secondary side, the output (122) that electromagnetism is transferred weighing apparatus unit (12) with link to each other with electric loading; Capacitance compensation unit (13) is connected in parallel in the three-phase circuit of distribution transformer secondary side; Described synthetic loss reduction device is connected communication system (2) by communication unit (15) with communication link (24), insert computer network (33) connected system master control platform (3) by communication system (2), it is characterized in that: the data transfer mode of communication unit (15) adopts " active communication " mode and " call together to survey and communicate by letter " mode, data transfer mode is by the value of the setting decision of communications control mode in the synthetic loss reduction controller (11), when synthetic loss reduction controller (11) is operated in " active communication " mode, synthetic loss reduction controller (11) is according to the default time interval, automatically detect the clock when the unification school, according to clock trigger signal, automatically upload relevant data according to predefined data type, send to master control platform (3) by the communication unit (15) that is attached thereto; When synthetic loss reduction controller (11) is operated in " call together and survey communication " mode, synthetic loss reduction controller (11) detects its serial ports that links to each other with communication unit (15) in real time, when receiving master control platform (3) when calling together of sending of communication system (2) surveyed signal, according to the requirement of communication instruction with relevant data loopback.

9, the damage system falls in power distribution network synthesis according to claim 8, it is characterized in that: communication system (2) is made of communication unit (15), the communication server (211), Control on Communication work station (212), communication interface (23) and communication link (24); Communication system (2) adopts " multisequencing pattern " to constitute the communication array, and communication task management software (221), communications control software (222) are installed respectively, operated on the different computers, and each computer connects by network system (33); Letter Control Software (222) adopts " multithreading " mode to support to receive synchronously the high capacity communication task of handling.

10, the damage system falls in power distribution network synthesis according to claim 8, it is characterized in that: system master platform (3) is made of system server (311), data server (312), WEB server (313), system operation Control work station (314), system remote maintenance work station (315), warning work station (316), computer network (33) and multiple-way feed system (34); System master platform (3) adopts " multisequencing pattern " to constitute the main website array, system server (311), data server (312), WEB server (313), operation Control work station (314), remote maintenance work station (315), warning work station (316) adopts different computers as hardware platform, operation control software (321), system configuration parameter storehouse (322), WEB information releasing software (323), alarm processing software (324), remote maintenance management software (325) and line loss automatic generating software (326) are installed respectively, operate on the different equipment; Line loss automatic generating software (326) calculates the line loss electric weight of every distribution line in power distribution network and the power distribution network automatically and falls the damage electric weight according to " trend method ", falls loss rate and energy-saving and emission-reduction benefit according to falling the calculating of damage electric weight; The user of described WEB information releasing software (323) in network provides " sharing " of relevant data.