CN104340085A - Urban rail medium voltage energy feedback power supply method and device with ring current eliminating function - Google Patents
Urban rail medium voltage energy feedback power supply method and device with ring current eliminating function Download PDFInfo
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- CN104340085A CN104340085A CN201410585665.3A CN201410585665A CN104340085A CN 104340085 A CN104340085 A CN 104340085A CN 201410585665 A CN201410585665 A CN 201410585665A CN 104340085 A CN104340085 A CN 104340085A
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Abstract
The invention discloses an urban rail medium voltage energy feedback power supply method and device with a ring current eliminating function. The method comprises the steps of arranging a high-power electronic power device in advance, detecting the direct current grid pressure of a direct current grid of an urban rail tractive power supply system and the no load voltage of a rectifier, and judging the operation state of a train, thereby controlling the throwing in and throwing off of a diode rectifier and an energy feedback converter and the on-off of the high-power electronic power device to eliminate ring current; the device comprises a high-voltage switch unit, a transformer, the diode rectifier, a first direct current switch unit, the energy feedback converter, a second direct current switch unit, the high-power electronic power device and switch device driving circuits. The device can ensure that the energy feedback converter and the diode rectifier do not form a loop when the urban rail train is in a traction power supply state, an energy feedback state and is switched between the two states, thereby realizing the ring current eliminating function, does not need to add an isolation transformer and an electric reactor, is lower in the cost, and has a compact structure.
Description
Technical field
What the present invention relates to city rail tractive power supply system can present electric supply installation, is specifically related to a kind of city rail medium-pressure type with circulation elimination function and can presents electric supply installation.
Background technology
In the regenerating braking energy regenerative apparatus of city rail, the regenerating braking energy that electric supply installation can make full use of train can be presented, good energy-conserving effect, good with middle pressure AC network compatibility, regenerating braking energy directly can be fed back to AC network for other equipment use, there is no the heating problem of energy consumption resistor, do not need other energy-storage travelling wave tubes yet, therefore become the most promising regenerated energy recovery scheme of city rail tractive power supply system.
City rail can be presented electric supply installation and be divided into by the difference exchanging feedback point that city rail high-pressure type can present electric supply installation, city rail medium-pressure type can present electric supply installation, city rail low-pressure type can present electric supply installation.Wherein rail high-pressure type in city can present electric supply installation, city rail low-pressure type can present electric supply installation and all pass through to present voltage transformer and press AC network or low-voltage network by being fed back in substation inside after the alternating current boosting after inversion or step-down.City rail medium-pressure type can be presented electric supply installation and comprise diode rectifier, current transformer and shared voltage transformer can be presented, the direct current network of city rail tractive power supply system passes through diode rectifier successively, voltage transformer is connected with middle pressure AC network, and describedly can present current transformer and diode rectifier is connected in parallel, when municipal rail train is braked, after regenerating braking energy passes through to present current transformer inversion, the alternating current obtained is fed back to the rectifier transformer low pressure side in traction substation in rectifier unit, boosted by rectifier transformer, press in AC network in the most at last in energy feedback to traction substation.City rail medium-pressure type can present electric supply installation can present device for transformer, advantage of lower cost owing to saving, and floor area is little, and the electric energy of feedback can utilize completely, is the very promising energy back feed device scheme of one.
The city rail medium-pressure type applied in the rail tractive power supply system of city at present can be presented in electric supply installation, current transformer and the shared voltage transformer of diode rectifier can be presented, although can the cost presenting voltage transformer be saved like this, reduction can present electric supply installation volume, but current transformer can be presented in this technical scheme and rectifier can form a loop, in the process of energy feedback, when the line voltage presenting AC side of converter reaches peak value, regenerating braking energy can cause rectifier transformer secondary side voltage to raise, Partial peaks voltage can higher than the DC bus-bar voltage of direct current network, thus cause the diode of diode rectifier from open-minded, with can present current transformer and form loop, produce circulation.This circulation can be presented in electric supply installation can cause current distortion at city rail medium-pressure type, reduce the overall performance of device, increase the system loss of device, increase electric supply installation noise, reduce the feedback efficiency of device, this becomes the inherent defect that current city rail medium-pressure type can present electric supply installation, is unfavorable for that energy feedback electric power system is stable, failure-free runs, limits the promotion and application that city rail medium-pressure type can present electric supply installation.
Therefore, circulation problem has become city rail medium-pressure type and can present electric supply installation key technical problem urgently to be resolved hurrily.For this technical matters, prior art has following several solution.
Prior art one: can present AC side of converter current-limiting reactor, because the size of loop current amount and the size of loop inductance are inversely proportional to, therefore can increase the method suppression circulation of loop inductance by additional reactor.But the program is in implementation process, in order to prevent inductance saturated, needing magnetic core or the air reactor of selecting larger volume, thus increasing device volume and weight, adding cost.
Prior art two: presenting current transformer DC side current-limiting reactor, identical with the principle of prior art one, suppresses circulation by increasing loop inductance.But reactor will cause AC side of converter and direct current net voltage rise high, and above two schemes all can only reduce circulation as far as possible, can not suppress circulation completely.
Prior art three: by adding isolating transformer and suppress circulation current transformer low-voltage alternating-current side can being presented, utilize the buffer action of isolating transformer, can circulation flow path be disconnected, thus realize suppressing the function of circulation.The loop current suppression effect of the relatively above-mentioned two schemes of the program will be got well, but adds isolating transformer, adds cost, also makes volume increase.
In sum, it is when presenting device and put into operation that the city rail medium-pressure type of prior art can present the topmost shortcoming that electric supply installation exists, and can present between current transformer and rectifier and there is circulation.Circulation will cause current distortion, increases system loss, and reduce performance and the efficiency of system, this all have impact on stability and the reliability of system.The technical scheme of several suppression circulation of current existence, has increase installation cost, the shortcoming of aggrandizement apparatus volume, and the scheme increasing loop inductance can only reduce circulation as far as possible, and the impact of circulation on system still exists.As everyone knows, city rail can present formula electric power system has become a kind of application system be mature on the whole, and use in field of track traffic such as subways, the reliability of energy back feed device, stability become the important indicator of power supply of city railway system.Therefore, how to provide the circulation that has of a kind of reliability, stability to eliminate the city rail medium-pressure type of function and can present electric supply installation, become a key technical problem urgently to be resolved hurrily.
Summary of the invention
The technical problem to be solved in the present invention is: for the above-mentioned technical matters of prior art, there is provided a kind of can guarantee present between current transformer and diode rectifier in all processes switched at traction power supply state, energy feedback state and two kinds of mode of operations at municipal rail train not form loop, thus reach the function eliminating circulation, and do not need to increase isolating transformer and reactor, advantage of lower cost, the city rail medium-pressure type with circulation elimination function of compact conformation can present method of supplying power to and device.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
The city rail medium-pressure type with circulation elimination function can present a method of supplying power to, and step comprises:
1) can present at city rail medium-pressure type between the both positive and negative polarity of the DC side outlet of the diode rectifier of electric supply installation and the direct current network of city rail tractive power supply system and arrange high-power electronic switch device, described city rail medium-pressure type can be presented electric supply installation and comprise diode rectifier, can present current transformer and shared voltage transformer, the direct current network of city rail tractive power supply system is connected with middle pressure AC network by diode rectifier, voltage transformer successively, and describedly can present current transformer and diode rectifier is connected in parallel; Initialize installation can be presented the input voltage threshold value of current transformer and exit voltage threshold value, exits electric current threshold value, and acquiescence disconnects high-power electronic switch device;
2) in city rail train process, detect the direct current net pressure of the direct current network of city rail tractive power supply system, obtain the rectifier non-load voltage of diode rectifier; If described direct current net pressure is less than or equal to rectifier non-load voltage, then redirect performs step 3); If described direct current net pressure is greater than rectifier non-load voltage and is less than drop into voltage threshold value, then redirect performs step 4); If described direct current net pressure is more than or equal to drop into voltage threshold value and rectifier non-load voltage, then redirect performs step 5);
3) judge without municipal rail train braking, do not reach energy feedback condition, closed high-power electronic switch device, diode rectifier is in and drops into state, can present current transformer is in and exits state, make diode rectifier and can present between current transformer do not have circulation, the alternating current of middle pressure AC network is powered through voltage transformer transformation, direct current network again for city rail tractive power supply system after diode rectifier rectification; Redirect performs step 2);
4) be determined with municipal rail train braking but braking energy is less or partial brake energy by other neighbouring municipal rail trains absorb, do not reach energy feedback condition, disconnect high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in and exits state, make diode rectifier and can present between current transformer do not have circulation, the regenerating braking energy produced by municipal rail train braking supports direct current net pressure; Redirect performs step 2);
5) be determined with municipal rail train braking, reach energy feedback condition, disconnect high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in input state, make diode rectifier and can present between current transformer do not have circulation, the unnecessary regenerating braking energy from the direct current network of city rail tractive power supply system is three plase alternating current by presenting current transformer inversion, after voltage transformer transformation, is fed back to middle pressure AC network again; Redirect performs step 6);
6) detect and can present current transformer DC side electric current, if described direct current net pressure is more than or equal to and exits voltage threshold value, can present current transformer DC side electric current and be more than or equal to and exit electric current threshold value two conditions and set up simultaneously, then redirect performs step 7); If described direct current net pressure is less than and exits voltage threshold value, can present current transformer DC side electric current and be less than and exit electric current threshold value two conditions and set up simultaneously, then judge to reach to exit energy feedback condition, redirect performs step 8);
7) judge not reach to exit energy feedback condition, disconnect high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in input state, make diode rectifier and can present between current transformer there is no circulation, feedback now from the unnecessary regenerating braking energy of the direct current network of city rail tractive power supply system not yet completes, and continues through can present current transformer inversion and be three plase alternating current, after voltage transformer transformation, be fed back to middle pressure AC network again; Redirect performs step 6);
8) closed high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in and exits state, makes diode rectifier and can present between current transformer do not have circulation; Redirect performs step 9);
9) the direct current net pressure of the direct current network of city rail tractive power supply system is detected, obtain the rectifier non-load voltage of diode rectifier, when exiting voltage threshold value described in described direct current net pressure is greater than rectifier non-load voltage and described direct current net pressure is less than, decision-making system has been in the stable process of bus voltage resume after energy feedback, remain closed high-power electronic switch device, diode rectifier is in and exits state, can present current transformer and be in and exit state, when described direct current net pressure is less than or equal to rectifier non-load voltage, redirect performs step 2).
Preferably, described step 2) detailed step comprise:
2.1) in city rail train process, detect the direct current net pressure (being called for short direct current net pressure) of the direct current network of city rail tractive power supply system, obtain the rectifier non-load voltage of diode rectifier;
2.2) the direct current net pressure detecting the direct current network of the city rail tractive power supply system obtained is contrasted with the rectifier non-load voltage of diode rectifier, if during described direct current net Hair Fixer life change of voltage also synchronously there is respective change in rectifier non-load voltage, then illustrate that the change of described direct current net pressure is caused by AC network change of voltage, instead of caused by train operation state change, terminate and exit; Otherwise judge that the change of direct current net pressure is changed by train operation state to cause, redirect performs step 2.3);
2.3) judge for the direct current net pressure of the direct current network of city rail tractive power supply system, rectifier non-load voltage, if described direct current net pressure is less than or equal to rectifier non-load voltage, then redirect performs step 3); If described direct current net pressure is greater than rectifier non-load voltage and is less than drop into voltage threshold value, then redirect performs step 4); If described direct current net pressure is more than or equal to drop into voltage threshold value and rectifier non-load voltage, then redirect performs step 5).
The present invention also provides a kind of city rail medium-pressure type with circulation elimination function to present electric supply installation, comprise high voltage switch unit, voltage transformer, diode rectifier, first DC switch unit, current transformer can be presented, second DC switch unit, high-power electronic switch device and binistor driving circuit, the primary winding of described voltage transformer is connected with middle pressure AC network by high voltage switch unit, the output primary of described voltage transformer passes through diode rectifier successively, first DC switch unit is connected with the direct current network of city rail tractive power supply system, and the output primary of described voltage transformer is also successively by presenting current transformer, second DC switch unit is connected with the direct current network of city rail tractive power supply system, between the both positive and negative polarity that described high-power electronic switch devices in series is connected to the DC side outlet of diode rectifier and the first DC switch unit, the mouth of described binistor driving circuit is connected with the control end of high-power electronic switch device.
Preferably, described voltage transformer comprises a primary winding and at least two output primary.
Preferably, described diode rectifier is 24 Pulses Rectifiers.
Preferably, described high-power electronic switch device is integrated gate commutated thyristor.
Preferably; described binistor driving circuit comprises power module, logic controller, opens maintenance module, turns off module, detects protection module, sending module, receiver module and state display module; the mouth of described power module respectively andlogic control device, open and maintain module, turn off module and be connected; the mouth of described logic controller respectively with open maintain module, turn off module, sending module, state display module be connected, the input end of described logic controller is connected with detection protection module, receiver module respectively.
Preferably, described logic controller is Programmable logical controller chip FPGA, and described sending module is optical fiber sending module, and described receiver module is optic fiber transceiver module.
The present invention has circulation and eliminates the city rail medium-pressure type of function to present the advantage of method of supplying power to as follows: the present invention arranges high-power electronic switch device by presenting at city rail medium-pressure type between the both positive and negative polarity of the diode rectifier DC side outlet of electric supply installation and the direct current network of city rail tractive power supply system, by to electric current and voltage Real-Time Monitoring each in system, and signal is processed, judge the running state of train, the on off mode controlling diode rectifier DC side high-power electronic switch device to can present current transformer carry out corresponding action under the various mode of operation of system, the traction power supply state at municipal rail train can be guaranteed, in all processes of energy feedback state and two kinds of mode of operation switchings, by controlling the break-make of diode rectification unit DC side high-power electronic switch device, can present between current transformer and diode rectifier and not form loop, thus realize the function eliminating circulation completely, and do not need to increase isolating transformer and reactor, advantage of lower cost, can not aggrandizement apparatus volume.
The present invention has circulation and eliminates the city rail medium-pressure type of function and can present electric supply installation and have following advantage: the present invention has city rail medium-pressure type that circulation eliminates function, and to present electric supply installation be that the present invention has the city rail medium-pressure type that circulation eliminates function and can present device corresponding to method of supplying power to, the output primary of voltage transformer passes through diode rectifier successively, first DC switch unit is connected with the direct current network of city rail tractive power supply system, and the output primary of voltage transformer is also successively by presenting current transformer, second DC switch unit is connected with the direct current network of city rail tractive power supply system, between the both positive and negative polarity that high-power electronic switch devices in series is connected to the DC side outlet of diode rectifier and the first DC switch unit, the mouth of binistor driving circuit is connected with the control end of high-power electronic switch device, under various mode of operation, corresponding action is carried out to control diode rectifier DC side electronic switch, the traction power supply state at municipal rail train can be guaranteed, in all processes of energy feedback state and two kinds of mode of operation switchings, by controlling the break-make of diode rectification unit DC side high-power electronic switch device, can present between current transformer and diode rectifier and not form loop, thus realize the function eliminating circulation completely, and do not need to increase isolating transformer and reactor, advantage of lower cost, can not aggrandizement apparatus volume.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of embodiment of the present invention method.
Fig. 2 is the electrical block diagram of embodiment of the present invention device.
Fig. 3 is the generalized section of prior art GCT structure.
Equivalent circuit diagram when Fig. 4 is prior art IGCT conducting.
Equivalent circuit diagram when Fig. 5 is prior art IGCT shutoff.
Fig. 6 is the framed structure schematic diagram of embodiment of the present invention breaker in middle component driving circuit.
Fig. 7 is the equivalent circuit structure schematic diagram in the embodiment of the present invention when high-power electronic switch device closes.
Marginal data: 1, high voltage switch unit; 2, voltage transformer; 3, diode rectifier; 4, the first DC switch unit; 5, current transformer can be presented; 6, the second DC switch unit; 7, high-power electronic switch device; 8, binistor driving circuit; 81, power module; 82, logic controller; 83, maintenance module is opened; 84, module is turned off; 85, protection module is detected; 86, sending module; 87, receiver module; 88, state display module.
Detailed description of the invention
As shown in Figure 1, the circulation that has of the present embodiment is eliminated the step that the city rail medium-pressure type of function can present method of supplying power to and is comprised:
1) can present at city rail medium-pressure type between the both positive and negative polarity of the DC side outlet of the diode rectifier of electric supply installation and the direct current network of city rail tractive power supply system and arrange high-power electronic switch device, city rail medium-pressure type can be presented electric supply installation and comprise diode rectifier, can present current transformer and shared voltage transformer, the direct current network of city rail tractive power supply system is connected with middle pressure AC network by diode rectifier, voltage transformer successively, and can present current transformer and diode rectifier is connected in parallel; Initialize installation can be presented the input voltage threshold value of current transformer and exit voltage threshold value, exits electric current threshold value, and acquiescence disconnects high-power electronic switch device;
2) in city rail train process, detect the direct current net pressure (being called for short direct current net pressure) of the direct current network of city rail tractive power supply system, obtain the rectifier non-load voltage of diode rectifier; If direct current net pressure is less than or equal to rectifier non-load voltage, then redirect performs step 3); If direct current net pressure is greater than rectifier non-load voltage and is less than drop into voltage threshold value, then redirect performs step 4); If direct current net pressure is more than or equal to drop into voltage threshold value and rectifier non-load voltage, then redirect performs step 5);
3) judge without municipal rail train braking, do not reach energy feedback condition, closed high-power electronic switch device, diode rectifier is in and drops into state, can present current transformer is in and exits state, make diode rectifier and can present between current transformer do not have circulation, the alternating current of middle pressure AC network is powered through voltage transformer transformation, direct current network again for city rail tractive power supply system after diode rectifier rectification; Redirect performs step 2);
4) be determined with municipal rail train braking but braking energy is less or partial brake energy by other neighbouring municipal rail trains absorb, do not reach energy feedback condition, disconnect high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in and exits state, make diode rectifier and can present between current transformer do not have circulation, the regenerating braking energy produced by municipal rail train braking supports direct current net pressure; Redirect performs step 2);
5) be determined with municipal rail train braking, reach energy feedback condition, disconnect high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in input state, make diode rectifier and can present between current transformer do not have circulation, the unnecessary regenerating braking energy from the direct current network of city rail tractive power supply system is three plase alternating current by presenting current transformer inversion, after voltage transformer transformation, is fed back to middle pressure AC network again; Redirect performs step 6);
6) detect and can present current transformer DC side electric current, if direct current net pressure is more than or equal to and exits voltage threshold value, can present current transformer DC side electric current and be more than or equal to and exit electric current threshold value two conditions and set up simultaneously, then redirect performs step 7); If direct current net pressure is less than and exits voltage threshold value, can present current transformer DC side electric current and be less than and exit electric current threshold value two conditions and set up simultaneously, then judge to reach to exit energy feedback condition, redirect performs step 8);
7) judge not reach to exit energy feedback condition, disconnect high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in input state, make diode rectifier and can present between current transformer there is no circulation, feedback now from the unnecessary regenerating braking energy of the direct current network of city rail tractive power supply system not yet completes, and continues through can present current transformer inversion and be three plase alternating current, after voltage transformer transformation, be fed back to middle pressure AC network again; Redirect performs step 6);
8) closed high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in and exits state, makes diode rectifier and can present between current transformer do not have circulation; Redirect performs step 9);
9) the direct current net pressure of the direct current network of city rail tractive power supply system is detected, obtain the rectifier non-load voltage of diode rectifier, when direct current net pressure be greater than rectifier non-load voltage and direct current net pressure be less than exit voltage threshold value time decision-making system be in the stable process of bus voltage resume after energy feedback, remain closed high-power electronic switch device, diode rectifier is in and exits state, can present current transformer and be in and exit state, when described direct current net pressure is less than or equal to rectifier non-load voltage, redirect performs step 2).
Due to the complexity of power supply of city railway system self structure, the realization of high-power electronic switch device 7 is more difficult, the reason of an aspect is very complicated for the on off mode logic control of high-power electronic switch device 7, therefore prior art is general it is envisioned that increases loop inductance by the mode increasing reactor and reaches the function suppressing circulation, the present embodiment is by above-mentioned steps 1) ~ 9), achieve the complete logic control for high-power electronic switch device 7, thus can realize eliminating based on high-power electronic switch device 7 circulation that city rail medium-pressure type can present power supply, guarantee the traction power supply state at municipal rail train, in all processes of energy feedback state and two kinds of mode of operation switchings, by controlling the break-make of diode rectification unit DC side high-power electronic switch device, can present between current transformer and diode rectifier and not form loop, thus realize the function eliminating circulation completely, and do not need to increase isolating transformer and reactor, advantage of lower cost, can not aggrandizement apparatus volume.
Step 2 in the present embodiment) detailed step comprise:
2.1) in city rail train process, detect the direct current net pressure (being called for short direct current net pressure) of the direct current network of city rail tractive power supply system, obtain the rectifier non-load voltage of diode rectifier;
2.2) the direct current net pressure detecting the direct current network of the city rail tractive power supply system obtained is contrasted with the rectifier non-load voltage of diode rectifier, if during direct current net Hair Fixer life change of voltage also synchronously there is respective change in rectifier non-load voltage, then the change of explanation direct current net pressure is caused by AC network change of voltage, instead of caused by train operation state change, terminate and exit; Otherwise judge that the change of direct current net pressure is changed by train operation state to cause, redirect performs step 2.3);
2.3) judge for the direct current net pressure of the direct current network of city rail tractive power supply system, rectifier non-load voltage, if direct current net pressure is less than or equal to rectifier non-load voltage, then redirect performs step 3); If direct current net pressure is greater than rectifier non-load voltage and is less than drop into voltage threshold value, then redirect performs step 4); If direct current net pressure is more than or equal to drop into voltage threshold value and rectifier non-load voltage, then redirect performs step 5).
To sum up step 2.1) ~ 2.3), when direct current net pressure changes, the present embodiment first by above-mentioned steps get rid of cause direct current net press change disturbed condition, namely non-train traction, braking and cause net pressure change, avoid maloperation.Caused by train operation when determining the change of direct current net pressure, then carry out the judgement of train operation state.
As shown in Figure 2, the city rail medium-pressure type with circulation elimination function of the present embodiment can be presented electric supply installation and comprise high voltage switch unit 1, voltage transformer 2, diode rectifier 3, first DC switch unit 4, current transformer 5 can be presented, second DC switch unit 6, high-power electronic switch device 7 and binistor driving circuit 8, the primary winding of voltage transformer 2 is connected with middle pressure AC network by high voltage switch unit 1, the output primary of voltage transformer 2 is successively by diode rectifier 3, first DC switch unit 4 is connected with the direct current network of city rail tractive power supply system, and the output primary of voltage transformer 2 is also successively by presenting current transformer 5, second DC switch unit 6 is connected with the direct current network of city rail tractive power supply system, between the both positive and negative polarity that high-power electronic switch device 7 is connected in series in the DC side outlet of diode rectifier 3 and the first DC switch unit 4, the mouth of binistor driving circuit 8 is connected with the control end of high-power electronic switch device 7.
In the present embodiment, high voltage switch unit 1 is arranged in high-tension switch cabinet, first DC switch unit 4, second DC switch unit 6 is arranged in direct-current switch cabinet, diode rectifier 3 is arranged in diode rectification cabinet, current transformer 5 can be presented be arranged in and can present in converter cabinet, can present converter cabinet to be connected with AC PT cabinet, AC PT cabinet is used for sampling to ac grid voltage, and sampled signal is converted to voltage synchronous signal by inner synchronous transformer.
In the present embodiment, voltage transformer 2 comprises a primary winding and at least two output primary.
Alternating current, by controlling diode switch, is converted to direct current (DC) by diode rectifier 3, the direct current contact system of supply train.In the present embodiment, diode rectifier 3 is 24 Pulses Rectifiers, and diode rectifier 3 also can adopt the rectifier based on diode of other types as required in addition.
For the selection of high-power electronic switch device 7 in the present embodiment, consider that circuit breaker is subject to the impact of on-off times, the position of frequent break-make can not be used in, therefore not be suitable for the present embodiment; Contactless switch switching speed and bear electric current ability on all out of reach requirements; GTO switching loss is too high; The requirement of IGBT current class out of reach.Consider each side factors such as the current class of high-power electronic switch device 7, switch life, switching speed, select integrated gate commutated thyristor (IGCT) as the electronic switching device of diode rectifier 2 DC side in the present embodiment, by the switching speed, the real-time that adopt IGCT can ensure high-power electronic switch device 7, and service life; And after the AC power-off of diode rectifier 2; recover again to impact the diode in diode rectifier 2 when powering on; frequent power-off will affect diode service life; therefore select to add high-power electronic switch device 7 in the DC side of diode rectifier, the object of the diode in available protecting diode rectifier 2 can also be played.IGCT by door pole stream-exchanging thyristor (GCT) and hard driven circuit integrated, combine the advantage of IGBT and GTO, GCT is at GTO(gate level turn-off thyristor) chip to introduce cushion layer, launch area can be penetrated and inverse guide structure is formed, its physical construction wants simple compared with IGBT.GCT structural profile is as shown in Figure 3 known, and GCT is four layers of three terminal device, is namely made up of four-level semiconductor material (PNPN), outside extraction three poles, and GCT inside is made up of hundreds and thousands of GCT units, with GTO similar.But GCT utilizes buffer layer technique, under identical blocking voltage, silicon chip is thinner, greatly can reduce conduction loss, employing simultaneously can penetrate lift-off technology makes GCT anode thinner, and is weak doping, during shutoff, electronics can be swept anode launch area, and inject without hole, improve turn-off speed, reduce turn-off power loss.IGCT adopts gate pole hard-drive technology, gate drive circuit, GCT are integrated, its conducting provides drive current to control to gate pole by driving circuit, by improving amplitude and the escalating rate of drive current, the difference of delay time in different sliver unit opening process in chip greatly can be reduced.Adopt such hard-drive gate trigger current mode, di/dt(and the current changing rate of IGCT self can be improved, corresponding dv/dt and voltage change ratio) tolerance, thus reduce the suppression inductance value needed for IGCT plate tank.Opening by force gate trigger current pulse makes cathode electronics inject very evenly, reduce the on-state voltage drop of IGCT device, thus speed is opened by raising device, reduces loss before anode current increases.The principle of work of IGCT depends on the working process of GCT, and available two transistors represent, during its conducting equivalent circuit diagram and turn off time equivalent circuit diagram as shown in Figure 4 and Figure 5.Moment when IGCT opens, gate pole applies positive strong voltage, and GCT is in NPN transistor state.After conducting, GCT is equivalent to the transistor of two positive feed backs, and strong positive feed back makes two transistor all saturation conductions, and therefore GCT is when conducting state, is equivalent to the positive feedback switches of a similar thyristor, and carry current capacity strong, on-state voltage drop is low.When IGCT turns off, before electric charge is drawn out of completely from anode N base, whole anode current turns to gate pole rapidly by negative electrode, allows GCT door-negative electrode PN junction enter reverse bias in advance and to deactivate when namely turning off by force, negative electrode injection instant, stops, and device is turned off under polar transistor mode.Before bearing any blocking voltage, namely IGCT becomes transistor, so without the restriction of additional dv/dt, without the need to absorbing circuit, therefore IGCT is without second breakdown, though the tail currents large time is very short.To sum up, under suitable gate pole drives by force, IGCT opens and is in NPN transistor state instantaneously, and be thyristor state during conducting, shutdown moment and off condition are PNP transistor state.
As shown in Figure 6, binistor driving circuit 8 comprises power module 81, logic controller 82, open and maintain module 83, turn off module 84, detect protection module 85, sending module 86, receiver module 87 and state display module 88, the mouth andlogic control device 82 respectively of power module 81, open and maintain module 83, turn off module 84 to be connected, the mouth of logic controller 82 maintains module 83 with opening respectively, turn off module 84, sending module 86, state display module 88 is connected, the input end of logic controller 82 respectively with detection protection module 85, receiver module 87 is connected.Current high-power electronic switch device 7 be difficult to city rail medium-pressure type can present the Another reason applied in electric supply installation be high-power electronic switch device 7 driving circuit design all difficult, therefore prior art generally increases loop inductance by the mode increasing reactor and reaches the function suppressing circulation, and can not use the method increasing high-power electronic switch device 7.The present embodiment, based on the structure of above-mentioned binistor driving circuit 8, can effectively realize controlling the break-make of high-power electronic switch device 7.
In the present embodiment, power module 81 adopts 20V direct supply, and generate 5V, the control power supply of 15V, open and maintain module 83 and provide to IGCT when obtaining the Continuity signal of logic controller 82 and open pulse current and on-state gate pole maintains electric current, turn off module 84 control IGCT when obtaining logic controller 82 cut-off signals to turn off, detect protection module 85 charge of overseeing drive circuit board and IGCT mode of operation, carry out when fault protecting and reporting to the police, logic controller 82 is Programmable logical controller chip FPGA, sending module 86, receiver module 87 is for realizing the signal contact of actuator and control system.In the present embodiment, sending module 86 is optical fiber sending module, and receiver module 87 is optic fiber transceiver module; In addition the transceiver interface module of other types can also be adopted as required.
In working order, press the city rail medium-pressure type with circulation elimination function of the direct current network of AC network, city rail tractive power supply system and the present embodiment can present the real-time sampling monitoring of electric supply installation electric current and voltage by centering, each voltage and current signal is processed, judge the running state of train and whether meet the condition of energy feedback, thus control to present the running state of current transformer 5 and the break-make of diode rectifier 3 DC side high-power electronic switch device 7, finally reach the object eliminated and can present circulation between current transformer 5 and diode rectifier 3.
The process of powering for the control realization of high-power electronic switch device 7 in the present embodiment is as follows: in city rail train process, AC PT cabinet carries out real-time sampling monitoring to AC voltage, the signal collected is delivered to the control system presenting converter cabinet by synchronous transformer, simultaneously to direct current contact system, the electric current and voltage presenting device and rectifier carries out Real-Time Monitoring, mainly based on the direct current net pressure of the direct current network of detection city rail tractive power supply system, the rectifier non-load voltage of diode rectifier, current transformer DC side electric current can be presented realize judging to present the running state of current transformer 5 and the input of diode rectifier, the condition exited, and control the break-make of high-power electronic switch device 7.When direct current net pressure changes, first need according to rectifier non-load voltage get rid of cause direct current net press change disturbed condition, namely non-train traction, braking and cause net pressure change, avoid maloperation.Caused by train operation when determining the change of direct current net pressure, then carry out the judgement of train operation state.
Composition graphs 1 is known, can present current transformer 5 and enter and drop into the judgement of state and have following several situation in the present embodiment:
(1) direct current net pressure≤rectifier non-load voltage.Judge without municipal rail train braking, do not reach energy feedback condition, closed high-power electronic switch device 7, diode rectifier 3 is in and drops into state, can present current transformer 5 is in and exits state, make diode rectifier 3 and can present between current transformer 5 there is no circulation, electric power system is in traction power supply state, and the alternating current of middle pressure AC network is powered through voltage transformer 2 transformation, direct current network again for city rail tractive power supply system after diode rectifier 3 rectification.
(2) rectifier non-load voltage < direct current net pressure < drops into voltage threshold value.Be determined with municipal rail train braking but braking energy is less or partial brake energy by other neighbouring municipal rail trains absorb, do not reach energy feedback condition, disconnect high-power electronic switch device 7, diode rectifier 3 is in and exits state, can present current transformer 5 is in and exits state, makes diode rectifier 3 and can present between current transformer 5 do not have circulation.Now owing to reaching the condition of energy feedback not yet, therefore the non-place in operation of current transformer 5 can be presented, and there is no circulation between diode rectifier 3, after disconnecting high-power electronic switch device 7, the rectification branch road at diode rectifier 3 place disconnects, braking mode is in owing to now there being municipal rail train, braking energy can support direct current net pressure, keeps normally running.When disconnecting high-power electronic switch device 7, be equivalent to only have and can present current transformer 5 branch road, its equivalent circuit diagram as shown in Figure 7.
(3) direct current net pressure >=rectifier non-load voltage and input voltage threshold value.
Be determined with municipal rail train braking, reach energy feedback condition, disconnect high-power electronic switch device 7, diode rectifier is in and exits state 3, can present current transformer 5 is in input state, make diode rectifier 3 and can present between current transformer 5 there is no circulation, system is in energy feedback state, from direct current network unnecessary of city rail tractive power supply system at regenerating braking energy by current transformer 5(IGBT unsteady flow module can be presented) inversion is three plase alternating current, after voltage transformer 2 transformation, is fed back to middle pressure AC network again.Direct current net pressure is in a uphill process before reaching and dropping into voltage threshold value, when direct current net pressure is greater than rectifier non-load voltage and when being less than the input voltage threshold value presenting device, namely above-mentioned situation (2) is in, then high-power electronic switch device 7 can disconnect rapidly before presenting current transformer 5 and starting input, avoid diode rectifier 3 and current transformer 5 can be presented and form loop when system traction power supply and energy feedback state switch, therefore the state that avoids switches rush current and the circulation of moment, power supply of city railway system pulsation-free is realized from traction power supply state to the conversion of energy feedback state.In whole energy feedback process, owing to being disconnected high-power electronic switch device 7, the rectification branch road at diode rectifier 3 place disconnects, diode rectifier 3 with can present current transformer 5 and no longer form a loop, therefore there is not circulation therebetween.
Composition graphs 1 is known, enters and drop into after state in the present embodiment, exits and drops into state, enters and exit state and have following several situation.
(4) direct current net pressure >=exit voltage threshold value, current transformer DC side electric current >=exit electric current threshold value can be presented.Judge not reach to exit energy feedback condition, disconnect high-power electronic switch device 7, diode rectifier 3 is in and exits state, can present current transformer 5 is in input state, make diode rectifier 3 and can present between current transformer 5 there is no circulation, the unnecessary feedback at regenerating braking energy now from the direct current network of city rail tractive power supply system not yet completes, and continues through can present current transformer 5 inversion and be three plase alternating current, after voltage transformer 2 transformation, be fed back to middle pressure AC network again.
(5) direct current net pressure < exits voltage threshold value, can present current transformer DC side electric current < and exit electric current threshold value.Judge to reach and exits energy feedback condition, closed high-power electronic switch device 7, diode rectifier 3 is in and exits state, current transformer 5 can be presented be in and exit state, make diode rectifier and can present between current transformer there is no circulation.
(6) rectifier non-load voltage < direct current net pressure < exits voltage threshold value.Decision-making system has been in the stable process of bus voltage resume after energy feedback, remain closed high-power electronic switch device, diode rectifier is in and exits state, can present current transformer and be in and exit state, when described direct current net pressure≤rectifier non-load voltage, redirect performs step 2).
Step 2) in see aforesaid condition (1), judge to be in traction power supply state when direct current net pressure≤rectifier non-load voltage under, closed high-power electronic switch device 7, diode rectifier 3 is in and drops into state, can present current transformer 5 is in and exits state, make diode rectifier 3 and can present between current transformer 5 there is no circulation, the alternating current of middle pressure AC network is powered through voltage transformer 2 transformation, direct current network again for city rail tractive power supply system after diode rectifier 3 rectification, waits for municipal rail train braking.
To sum up, the present embodiment is in medium-pressure type energy feedback electric power system, in all processes that train traction power supply state, energy feedback state and two states switch, by to the process of each voltage and current signal and judgement, control the high-power electronic switch device 7 of diode rectifier 3 DC side, all can present current transformer 5 in the process can run in whole electric power system to disconnect with the loop of diode rectifier 3, the circulation between both eliminations.The present embodiment adds high-power electronic switch device 7 in the DC side of diode rectifier 3, voltage synchronous signal is provided by AC PT cabinet, system real-time sampling monitoring direct current network, the electric current and voltage of current transformer 5 can be presented, and arrange can present current transformer 5 input voltage threshold value, exit electric current threshold value.Based on the direct current net pressure detected, rectifier non-load voltage, current transformer DC side electric current can be presented and judge train operation state and system running state, according to judging that the state obtained obtains operating instruction, to diode rectifier DC side electronic switch state and plant running state can be presented control accordingly, make train in traction power supply state, in all processes that energy feedback state and two states switch, current transformer can be presented and diode rectifier does not form loop, reach the object eliminating circulation, compare the method that conventional medium-pressure type energy back feed device suppresses circulation, the present embodiment eliminates the better effects if of circulation, circulation can be eliminated completely, instead of suppress circulation as far as possible, and the reliability of the present embodiment is high, while elimination circulation, the switching between the various running state of the system that also assures that is steady, and security and stability is high, in addition, the present embodiment compares the method that conventional medium-pressure type energy back feed device suppresses circulation, eliminates isolating transformer and reactor device, has saved system cost, reduced volume.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. the city rail medium-pressure type with circulation elimination function can present a method of supplying power to, it is characterized in that step comprises:
1) can present at city rail medium-pressure type between the both positive and negative polarity of the DC side outlet of the diode rectifier of electric supply installation and the direct current network of city rail tractive power supply system and arrange high-power electronic switch device, described city rail medium-pressure type can be presented electric supply installation and comprise diode rectifier, can present current transformer and shared voltage transformer, the direct current network of city rail tractive power supply system is connected with middle pressure AC network by diode rectifier, voltage transformer successively, and describedly can present current transformer and diode rectifier is connected in parallel; Initialize installation can be presented the input voltage threshold value of current transformer and exit voltage threshold value, exits electric current threshold value, and acquiescence disconnects high-power electronic switch device;
2) in city rail train process, detect the direct current net pressure of the direct current network of city rail tractive power supply system, obtain the rectifier non-load voltage of diode rectifier; If described direct current net pressure is less than or equal to rectifier non-load voltage, then redirect performs step 3); If described direct current net pressure is greater than rectifier non-load voltage and is less than drop into voltage threshold value, then redirect performs step 4); If described direct current net pressure is more than or equal to drop into voltage threshold value and rectifier non-load voltage, then redirect performs step 5);
3) judge without municipal rail train braking, do not reach energy feedback condition, closed high-power electronic switch device, diode rectifier is in and drops into state, can present current transformer is in and exits state, make diode rectifier and can present between current transformer do not have circulation, the alternating current of middle pressure AC network is powered through voltage transformer transformation, direct current network again for city rail tractive power supply system after diode rectifier rectification; Redirect performs step 2);
4) be determined with municipal rail train braking but braking energy is less or partial brake energy by other neighbouring municipal rail trains absorb, do not reach energy feedback condition, disconnect high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in and exits state, make diode rectifier and can present between current transformer do not have circulation, the regenerating braking energy produced by municipal rail train braking supports direct current net pressure; Redirect performs step 2);
5) be determined with municipal rail train braking, reach energy feedback condition, disconnect high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in input state, make diode rectifier and can present between current transformer do not have circulation, the unnecessary regenerating braking energy from the direct current network of city rail tractive power supply system is three plase alternating current by presenting current transformer inversion, after voltage transformer transformation, is fed back to middle pressure AC network again; Redirect performs step 6);
6) detect and can present current transformer DC side electric current, if described direct current net pressure is more than or equal to and exits voltage threshold value, can present current transformer DC side electric current and be more than or equal to and exit electric current threshold value two conditions and set up simultaneously, then redirect performs step 7); If described direct current net pressure is less than and exits voltage threshold value, can present current transformer DC side electric current and be less than and exit electric current threshold value two conditions and set up simultaneously, then judge to reach to exit energy feedback condition, redirect performs step 8);
7) judge not reach to exit energy feedback condition, disconnect high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in input state, make diode rectifier and can present between current transformer there is no circulation, feedback now from the unnecessary regenerating braking energy of the direct current network of city rail tractive power supply system not yet completes, and continues through can present current transformer inversion and be three plase alternating current, after voltage transformer transformation, be fed back to middle pressure AC network again; Redirect performs step 6);
8) closed high-power electronic switch device, diode rectifier is in and exits state, can present current transformer is in and exits state, makes diode rectifier and can present between current transformer do not have circulation; Redirect performs step 9);
9) the direct current net pressure of the direct current network of city rail tractive power supply system is detected, obtain the rectifier non-load voltage of diode rectifier, when exiting voltage threshold value described in described direct current net pressure is greater than rectifier non-load voltage and described direct current net pressure is less than, decision-making system has been in the stable process of bus voltage resume after energy feedback, remain closed high-power electronic switch device, diode rectifier is in and exits state, can present current transformer and be in and exit state, when described direct current net pressure is less than or equal to rectifier non-load voltage, redirect performs step 2).
2. according to claim 1 have circulation and eliminate the city rail medium-pressure type of function and can present method of supplying power to, it is characterized in that, described step 2) detailed step comprise:
2.1) in city rail train process, detect the direct current net pressure (being called for short direct current net pressure) of the direct current network of city rail tractive power supply system, obtain the rectifier non-load voltage of diode rectifier;
2.2) the direct current net pressure detecting the direct current network of the city rail tractive power supply system obtained is contrasted with the rectifier non-load voltage of diode rectifier, if during described direct current net Hair Fixer life change of voltage also synchronously there is respective change in rectifier non-load voltage, then illustrate that the change of described direct current net pressure is caused by AC network change of voltage, instead of caused by train operation state change, terminate and exit; Otherwise judge that the change of direct current net pressure is changed by train operation state to cause, redirect performs step 2.3);
2.3) judge for the direct current net pressure of the direct current network of city rail tractive power supply system, rectifier non-load voltage, if described direct current net pressure is less than or equal to rectifier non-load voltage, then redirect performs step 3); If described direct current net pressure is greater than rectifier non-load voltage and is less than drop into voltage threshold value, then redirect performs step 4); If described direct current net pressure is more than or equal to drop into voltage threshold value and rectifier non-load voltage, then redirect performs step 5).
3. a city rail medium-pressure type with circulation elimination function can present electric supply installation, it is characterized in that: comprise high voltage switch unit (1), voltage transformer (2), diode rectifier (3), first DC switch unit (4), current transformer (5) can be presented, second DC switch unit (6), high-power electronic switch device (7) and binistor driving circuit (8), the primary winding of described voltage transformer (2) is connected with middle pressure AC network by high voltage switch unit (1), the output primary of described voltage transformer (2) is successively by diode rectifier (3), first DC switch unit (4) is connected with the direct current network of city rail tractive power supply system, and the output primary of described voltage transformer (2) is also successively by presenting current transformer (5), second DC switch unit (6) is connected with the direct current network of city rail tractive power supply system, between the both positive and negative polarity that described high-power electronic switch device (7) is connected in series in the DC side outlet of diode rectifier (3) and the first DC switch unit (4), the mouth of described binistor driving circuit (8) is connected with the control end of high-power electronic switch device (7).
4. the city rail medium-pressure type with circulation elimination function according to claim 3 can present electric supply installation, it is characterized in that: described voltage transformer (2) comprises a primary winding and at least two output primary.
5. the city rail medium-pressure type with circulation elimination function according to claim 4 can present electric supply installation, it is characterized in that: described diode rectifier (3) is 24 Pulses Rectifiers.
6. the city rail medium-pressure type with circulation elimination function according to claim 3 or 4 or 5 can present electric supply installation, it is characterized in that: described high-power electronic switch device (7) is integrated gate commutated thyristor.
7. the city rail medium-pressure type with circulation elimination function according to claim 6 can present electric supply installation, it is characterized in that: described binistor driving circuit (8) comprises power module (81), logic controller (82), open and maintain module (83), turn off module (84), detect protection module (85), sending module (86), receiver module (87) and state display module (88), mouth andlogic control device (82) respectively of described power module (81), open and maintain module (83), turn off module (84) to be connected, the mouth of described logic controller (82) maintains module (83) with opening respectively, turn off module (84), sending module (86), state display module (88) is connected, the input end of described logic controller (82) respectively with detection protection module (85), receiver module (87) is connected.
8. the city rail medium-pressure type with circulation elimination function according to claim 7 can present electric supply installation, it is characterized in that: described logic controller (82) is Programmable logical controller chip FPGA, described sending module (86) is optical fiber sending module, and described receiver module (87) is optic fiber transceiver module.
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| CN112356741A (en) * | 2020-11-20 | 2021-02-12 | 西安许继电力电子技术有限公司 | Feedback control method and system based on PWM energy feedback converter |
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