CN104836252A - Urban rail transit medium-voltage inverter type renewable energy utilization device - Google Patents
Urban rail transit medium-voltage inverter type renewable energy utilization device Download PDFInfo
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- CN104836252A CN104836252A CN201510223159.4A CN201510223159A CN104836252A CN 104836252 A CN104836252 A CN 104836252A CN 201510223159 A CN201510223159 A CN 201510223159A CN 104836252 A CN104836252 A CN 104836252A
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Abstract
An urban rail transit medium-voltage inverter type renewable energy utilization device includes a first rectifier transformer, a first rectifier connected with the first rectifier transformer, a second rectifier transformer and a second rectifier connected with the second rectifier transformer. The urban rail transit medium-voltage inverter type renewable energy utilization device also includes a feedback transformer, an inverter connected with the feedback transformer and a medium-voltage switch connected with the inverter. According to the invention, the device facilitates the recovery of renewable braking energy, requires no configuration of a resistance device, can solve the problems of high resistor heat productivity, large noise and the like, and has remarkable energy-saving effects.
Description
Technical field
The present invention relates to urban rail transit technology field, particularly relate in a kind of urban track traffic and press inverse type regenerative electric energy to utilize device.
Background technology
Urban track traffic has that distance between sites is short, vehicle operating density high, can produce considerable braking energy in the process of vehicle Fraquent start and braking.In Feeding System of Urban Rail Transit, train regenerating braking energy absorbs has become one of very important link with feedback, can not only play the effect reducing tunnel temperature rise, reduce the abrasion of vehicle brake shoe, also have significant energy-saving effect.
At present, in the field of urban rail built up, regenerative electric energy utilizes device to mainly contain following a few class, resistance energy consumption type, accumulation energy type and inversion feedback type.
As shown in Figure 1, it is resistance energy consumption type, described resistance energy consumption type regenerative electric energy utilizes device mainly to adopt the constant voltage absorption pattern of heterogeneous IGBT chopper and absorption resistance cooperation, the conduction ratio of chopper is regulated according to the variable condition of DC bus-bar voltage during regenerative braking, thus change absorbed power, by constant for direct voltage in the scope of a certain set point, and by braking energy consumption on absorption resistance.
As shown in Figure 2, it is accumulation energy type, described accumulation energy type regenerative electric energy utilizes device mainly to adopt IGBT inverter by the regenerative braking energy absorption of train in energy storage device, energy storage device can select super capacitor or flywheel, when have in service area launch train, accelerate needs get stream time, stored electric energy discharges and recycles by this device.The electrical system of such device mainly comprises the compositions such as energy storage device, IGBT chopper, direct current quick breaker, electric isolating switch, transducer and microcomputer control unit.
As shown in Figure 3, it is low pressure inversion feedback type, described low pressure inversion feedback type device mainly adopts IGBT to form large power three-phase inverter, and the DC side of this inverter is connected with the rectifier DC bus in traction substation, and it exchanges inlet wire and receives in 400V AC network; When regenerative braking makes direct voltage exceed setting, inverter startup, and from DC bus Absorption Current, be that industrial-frequency alternating current is fed back in 400V AC network by the inversion of regeneration direct current energy.
But above-mentioned three types regenerative electric energy utilizes device to there is following technical problem: in existing line, mounted resistance energy consumption type device also exists the problem that caloric value is large, noise is serious first at present, metro operation company has received the complaint of the resident near multiple subway station, resistance energy consumption type device is only change into heat exhaustion to fall to regenerative electric energy simultaneously, again do not utilize, therefore, the scheme of resistance energy consumption type no longer adopts gradually; Then accumulation energy type device at present at home subway main track there is no successful Application case, and the maximum at present restraining factors of accumulation energy type device are high costs.The super capacitor energy storage type device price of current domestic production is more than 2 times of inverse type device, and super capacitor energy storage type device sets volume greatly, installs and there is larger difficulty in track traffic electric substation.Energy accumulation device for fly wheel is limited by the technology of flywheel gear at present, and domestic at present only have a supplier to possess availability, and the price of energy accumulation device for fly wheel is higher than super capacitor energy storage type device simultaneously; Last low pressure inversion feedback type device limits by electric substation's distribution transformer installed capacity, capacity is difficult to do greatly, the low pressure inverter of current domestic direct current 1500V can accomplish 1200W, and the low pressure inverter of direct current 750V can accomplish 900kW, because rail transit train braking energy instantaneous power is very high, usually will more than 2MW, therefore, low pressure inverter is difficult to the demand meeting track traffic, also need with resistor-type device with the use of.Therefore, adopt the program, the problems such as the caloric value of resistance energy consumption type scheme is large, noise is large still exist.
Therefore, be necessary to provide a kind of new technical scheme to overcome above-mentioned defect.
Summary of the invention
The object of the present invention is to provide in a kind of urban track traffic that can effectively solve the problems of the technologies described above presses inverse type regenerative electric energy to utilize device.
For achieving the above object, the present invention adopts following technical scheme:
Inverse type regenerative electric energy is pressed to utilize device in a kind of urban track traffic, it comprises the first rectifier transformer, the first rectifier be connected with described first rectifier transformer, second rectifier transformer, the second rectifier be connected with described second rectifier transformer, inverse type regenerative electric energy is pressed to utilize device also to comprise fly-back transformer in described urban track traffic, the inverter be connected with described fly-back transformer and the Medium voltage switch or circuit breaker be connected with inverter, the DC side of described inverter respectively with electric substation just, negative busbar connects, the AC of described inverter is connected with described fly-back transformer.
Described fly-back transformer is by described Medium voltage switch or circuit breaker incoming transport 10kV or 35kV bus.
The DC side of described first rectifier and the second rectifier is connected with the positive and negative bus of electric substation.
Described first rectifier transformer and the second rectifier transformer incoming transport 10kV or 35kV bus.
Compared with prior art, the present invention has following beneficial effect: press inverse type regenerative electric energy to utilize device to be directly fed back to middle-voltage network (10kV or 35kV looped network) by switch, inverter and fly-back transformer in urban track traffic of the present invention, instead of be fed back to 400V bus, thus be more conducive to the recycling of regenerating braking energy.And because regenerative electric energy is directly fed back to middle pressure ring net, installed capacity can reach 2MW to 4MW, without the need to configuring resistance device, can solve the problems such as resistance heating amount is high, noise is large.Simultaneously energy-saving effect is remarkable, and according to the actual operation data of No. 14 lines in Beijing, every day, every covering device can save energy more than 2000kWh, and compared with low pressure inversion feedback device every day energy-conservation 1000kWh, every day can more piece energy 1000kWh.
Accompanying drawing explanation
Fig. 1 is the structural representation that existing resistance energy consumption type regenerative electric energy utilizes device;
Fig. 2 is the structural representation that existing accumulation energy type regenerative electric energy utilizes device;
Fig. 3 is the structural representation that existing low pressure inversion feedback type regenerative electric energy utilizes device;
Fig. 4 presses inverse type regenerative electric energy to utilize the structural representation of device in urban track traffic of the present invention;
Fig. 5 is the structural representation of existing 24 pulse wave rectifier units;
Fig. 6 is the structural representation of first embodiment of the invention;
Fig. 7 is the structural representation of second embodiment of the invention;
Fig. 8 is the structural representation of third embodiment of the invention.
Embodiment
As shown in Figure 4, inverse type regenerative electric energy is pressed to utilize device to comprise the first rectifier transformer Tr1, the second rectifier transformer Tr2, the first rectifier R1 be connected with described first rectifier transformer Tr1, the second rectifier R2, the fly-back transformer Td that are connected with described second rectifier transformer Tr2, the inverter INV be connected with described fly-back transformer Td and the Medium voltage switch or circuit breaker 821 be connected with inverter INV in urban track traffic of the present invention.The DC side of described inverter INV is connected with the positive and negative bus of electric substation respectively, the AC of described inverter INV is connected with described fly-back transformer Td, described fly-back transformer Td by described Medium voltage switch or circuit breaker 821 incoming transport 10kV or 35kV bus, thus forms the feedback path of regenerative electric energy of the present invention.Described first rectifier R1 and the DC side of the second rectifier R2 are connected with the positive and negative bus of electric substation, described first rectifier transformer Tr1 and the second rectifier transformer Tr2 incoming transport 10kV or 35kV bus.Other structures are prior art, therefore do not repeat them here.
As shown in Figure 5, it is the structural representation of current city track traffic traction power set, its 24 Pulses Rectifiers be made up of two cover 12 pulse wave rectifier units, and its one end is connected with the AC network of 10kV or 35kV, and the other end is connected with 750V or 1500V.Because it adopts two cover 12 pulse wave rectifier units in parallel, thus expand power system capacity to facilitate, peak power requirements when meeting train traction, ensure on the other hand the redundancy of system, a set of unit break down exit time, a set of unit can also work in addition, in addition, owing to adopting phase shifting transformer, fractional harmonic composition between two cover units can also be realized and offset, reduce alternating current harmonic content.
As shown in Figure 6, it presses inverse type regenerative electric energy to utilize the first embodiment of device in urban track traffic of the present invention, to inverse type regenerative electric energy be pressed in the urban track traffic of the present invention of two covers to utilize device to substitute two existing cover 12 pulse wave rectifier units completely, it has following pluses and minuses:
Advantage: without the need to additionally increasing installation space, especially without the need to increasing transformer, total occupation of land is little, can make full use of the Bidirectional variable-flow ability of middle pressure inverse type feedback device, energy is provided, by unnecessary regenerating braking energy feedback communication electrical network during train braking during train traction.In addition, because middle pressure inverse type feedback device has output voltage regulating power, therefore, direct current net pressure can maintain good stationarity, capacity also better can meet the absorption demand of train regenerating braking energy.
Shortcoming: in order to meet the requirement of VI stage load, equipment peaking capacity is large, and require that overload capacity is strong, before high-power IGBT semiconductor device does not have scale volume production, equipment price costly.
As shown in Figure 7, it presses inverse type regenerative electric energy to utilize the second embodiment of device in urban track traffic of the present invention, it utilizes device to substitute a set of 12 pulse wave rectifier units by pressing inverse type regenerative electric energy in a set of urban track traffic of the present invention, retain a set of original 12 pulse Rectification Power Factor, its pluses and minuses are as follows:
Advantage: without the need to additionally increasing installation space, especially without the need to increasing transformer, total occupation of land is little, and have the advantage that Rectification Power Factor structure is simple, reliability is high, cheap and middle pressure inverse type feedback device energy in bidirectional flow, output characteristic are controlled concurrently, while realizing the utilization of train regenerative braking energy feedback, overall system investment increases few.
Shortcoming: after adopting 12 pulse wave rectifiers, the harmonic content of alternating current can increase to some extent relative to original 24 pulse wave rectifiers, in addition, press in one on inverse type feedback device capacity and be also difficult to meet train in particular cases regenerating braking energy absorption demand completely, such as, when single vehicles is braked at a high speed.
As shown in Figure 8, it presses inverse type regenerative electric energy to utilize the 3rd embodiment of device in urban track traffic of the present invention, it is on the basis retaining 24 traditional pulse wave rectifier units, inverse type regenerative electric energy is pressed to utilize device in a set of independently urban track traffic of the present invention of extra increase, and in parallel with it, its pluses and minuses are as follows:
Advantage: when not changing existing power supply unit, has independently increased the 3rd unit newly, adds electric substation's traction power supply capacity, achieve effective feedback of train regenerating braking energy, can not cause adverse effect to original supply power mode, system reliability is high simultaneously, promotes difficulty little.
Shortcoming: additionally need increase installation space, increases equipment investment.
Owing to pressing inverse type regenerative electric energy to utilize device to belong to new technology in urban track traffic of the present invention, therefore, be optimized for the relaying protection aspect of pressing inverse type regenerative electric energy to utilize device to access electric power system in urban track traffic of the present invention.
First, inverse type regenerative electric energy is pressed to utilize device can be considered to a power supply in urban track traffic of the present invention, if device is in reversals, external power dead electricity, then this section of bus load in this power supply area can occur by the situation of pressing inverse type regenerative electric energy to utilize device to power in urban track traffic of the present invention.In this case, the present invention will form an independently circuit cycles with power load.Because inverter is not a reliable and stable power supply, when braking force of train declines, when feedback electric energy declines, the voltage of power consumption equipment will be caused to reduce or frequency reduces thereupon, will the stable operation of power consumption equipment be affected.
The transformer of special definite value that to be finally fly-back transformer of the present invention be, this transformer leakage reactance value is about 30% ~ 40%.When this just causes fly-back transformer time limit to be short-circuited, short circuit current will be less than device maximum operating currenbt, cause 821 switch overcurrent protection definite values to arrange the problem of difficulty.
For above-mentioned technical problem, adopt following solution:
First carry out low-frequency load reduction protection, it can be protected the fault that inverter frequency of the present invention reduces.Low-frequency load reduction protection effectively can control the quality of power supply, as a backup protection of internal protection of the present invention.Namely in the middle of, voltage source is when exiting, and the present invention is operated in electric energy feedback state just, and the internal protection of device own can not effective action time, low-frequency load reduction protection can disconnect 821 switches, to avoid the appearance of island effect.Now system will detect 10kV mono-section of bus loss of pressure and automatically drop into bus connection switch, to guarantee the safety utilization of electric power of this section of each equipment of bus.
Being finally low voltage starting overcurrent protection (can the sense of current be distinguished), when having a power failure in external power in reversals, low voltage in reversals being affected to the protection of power supply quality.Can in duplicate supply situation, the sense of current for different running method arranges definite value respectively, less to solve transformer time change short circuit current, the problem of protection difficulty.Because fly-back transformer is the transformer of particular design, leakage reactance value is higher, and when therefore fly-back transformer time limit is short-circuited, short circuit current will be less than device maximum operating currenbt, cause 821 switch overcurrent protection definite values to arrange difficulty.The low voltage starting overcurrent protection distinguishing the sense of current at 821 switch-linear hybrid can effectively overcome the above problems, and namely the current direction of default 821 switch is unidirectional, only allows electric current to flow to 10kV bus by the present invention.When fly-back transformer time limit is short-circuited, 821 can detect the electric current being presented transformer by the 10kV bus flow direction, can disconnect 821 switches by protection act, excise fault rapidly during to ensure short circuit.
Obviously, above-described embodiment is only used to clearly example is described, and the restriction not to execution mode.For those of ordinary skill in the field, other multi-form change or variations can also be made on the basis of the above description.Here without the need to also giving exhaustive to all execution modes.And thus the apparent change of amplifying out or variation be still among the protection range of the invention.
Claims (4)
1. press inverse type regenerative electric energy to utilize device in a urban track traffic, it comprises the first rectifier transformer, the first rectifier be connected with described first rectifier transformer, second rectifier transformer, the second rectifier be connected with described second rectifier transformer, it is characterized in that: in described urban track traffic, press inverse type regenerative electric energy to utilize device also to comprise fly-back transformer, the inverter be connected with described fly-back transformer and the Medium voltage switch or circuit breaker be connected with inverter, the DC side of described inverter respectively with electric substation just, negative busbar connects, the AC of described inverter is connected with described fly-back transformer.
2. press inverse type regenerative electric energy to utilize device in urban track traffic as claimed in claim 2, it is characterized in that: described fly-back transformer is by described Medium voltage switch or circuit breaker incoming transport 10kV or 35kV bus.
3. press inverse type regenerative electric energy to utilize device in urban track traffic as claimed in claim 3, it is characterized in that: the DC side of described first rectifier and the second rectifier is connected with the positive and negative bus of electric substation.
4. press inverse type regenerative electric energy to utilize device in urban track traffic as claimed in claim 4, it is characterized in that: described first rectifier transformer and the second rectifier transformer incoming transport 10kV or 35kV bus.
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| CN201510223159.4A CN104836252A (en) | 2015-05-05 | 2015-05-05 | Urban rail transit medium-voltage inverter type renewable energy utilization device |
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| CN201510223159.4A CN104836252A (en) | 2015-05-05 | 2015-05-05 | Urban rail transit medium-voltage inverter type renewable energy utilization device |
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Cited By (5)
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| CN105116260A (en) * | 2015-09-07 | 2015-12-02 | 西南交通大学 | Direct-current traction substation regenerative electric energy utilization test system |
| CN109733253A (en) * | 2019-03-25 | 2019-05-10 | 盾石磁能科技有限责任公司 | Utilize the system and method that can present inverter and solve the problems, such as rail potential |
| CN111355240A (en) * | 2018-12-21 | 2020-06-30 | 西安许继电力电子技术有限公司 | Rail transit power distribution network system, power supply system and regenerated energy inverter circuit |
| CN112737368A (en) * | 2020-12-09 | 2021-04-30 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | High-performance rectifying power supply device |
| CN113014078A (en) * | 2021-04-21 | 2021-06-22 | 重庆中车长客轨道车辆有限公司 | Energy absorption method for a rail vehicle |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116260A (en) * | 2015-09-07 | 2015-12-02 | 西南交通大学 | Direct-current traction substation regenerative electric energy utilization test system |
| CN105116260B (en) * | 2015-09-07 | 2017-10-17 | 西南交通大学 | A kind of DC traction substation regenerative electric energy utilizes pilot system |
| CN111355240A (en) * | 2018-12-21 | 2020-06-30 | 西安许继电力电子技术有限公司 | Rail transit power distribution network system, power supply system and regenerated energy inverter circuit |
| CN111355240B (en) * | 2018-12-21 | 2024-04-19 | 西安许继电力电子技术有限公司 | Rail transit power distribution network system, power supply system and regenerated energy inverter circuit |
| CN109733253A (en) * | 2019-03-25 | 2019-05-10 | 盾石磁能科技有限责任公司 | Utilize the system and method that can present inverter and solve the problems, such as rail potential |
| CN112737368A (en) * | 2020-12-09 | 2021-04-30 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | High-performance rectifying power supply device |
| CN113014078A (en) * | 2021-04-21 | 2021-06-22 | 重庆中车长客轨道车辆有限公司 | Energy absorption method for a rail vehicle |
| CN113014078B (en) * | 2021-04-21 | 2022-02-15 | 重庆中车长客轨道车辆有限公司 | Energy absorption method for a rail vehicle |
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Application publication date: 20150812 |