CN106364328B - Braking energy absorption plant and its control method - Google Patents
Braking energy absorption plant and its control method Download PDFInfo
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- CN106364328B CN106364328B CN201610873511.3A CN201610873511A CN106364328B CN 106364328 B CN106364328 B CN 106364328B CN 201610873511 A CN201610873511 A CN 201610873511A CN 106364328 B CN106364328 B CN 106364328B
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- braking resistor
- braking
- capacitor
- gradually
- switching frequency
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/02—Arrangements for reducing harmonics or ripples
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
A kind of braking energy absorption plant of the invention and its control method, disconnecting switch QS1, main D.C. contactor KM1, reactor L and capacitor C, the main D.C. contactor KM1 including being connected between DC power anode and DC power cathode are parallel with the series arm being made of snubber contact device KM2 and resistance R1；The capacitor C1 is parallel with copped wave branch, and the copped wave branch includes that the IGBT module V1 being connected in series and fast recovery diode V2, the fast recovery diode V2 are parallel with braking resistor R2.The beneficial effects of the present invention are: ensure that the phenomenon that fluctuation does not occur in DC bus-bar voltage, there is good rapidity and certain stability, substantially reduce the overall volume and production cost of device.
Description
Technical field
The present invention relates to a kind of braking energy absorption plant and its control methods.
Background technique
The control of existing braking energy absorption plant all is all the side using the simple conducting dutycycle for adjusting IGBT
Formula realizes that such mode biggest advantage is that control mode is simple, but its absorb power it is relatively large when, to DC grid
Influence it is more obvious, need to be equipped with direct current reactor to reduce the disturbance to DC grid voltage.
Summary of the invention
To solve the above technical deficiency, the present invention provides a kind of fast response time, the low Brake Energies of production cost
Measure absorption plant and its control method.
The present invention is achieved by the following measures:
A kind of braking energy absorption plant of the invention, including be connected between DC power anode and DC power cathode
Disconnecting switch QS1, main D.C. contactor KM1, reactor L and capacitor C, the main D.C. contactor KM1 is parallel with by buffering
The series arm of contactor KM2 and resistance R1 composition；The capacitor C1 is parallel with copped wave branch, and the copped wave branch includes mutually going here and there
The IGBT module V1 and fast recovery diode V2, the fast recovery diode V2 of connection are parallel with braking resistor R2.
A kind of control method of braking energy absorption plant of the invention, comprising the following steps:
Step 1, it determines the fluctuation range value Δ U that DC bus-bar voltage allows, calculates the maximum allowable braking resistor of single
Making time Δ t；Its calculation formula is as follows:
Wherein, I indicates that the transient absorption electric current of braking resistor R2, C indicate the capacitance of capacitor C1；
Step 2, when braking initial stage, the braking resistor switching frequency of setting is kept, and is thrown by gradually increasing braking resistor
Duty ratio is gradually increased in the mode of angle of incidence t, when braking resistor making time t is gradually increased to the throwing of maximum allowable braking resistor
When angle of incidence Δ t, step 3 is carried out；
Step 3, it keeps the making time Δ t of maximum allowable braking resistor constant, first gradually increases the switching of braking resistor
Then frequency is gradually reduced the switching frequency of braking resistor, when the switching frequency of braking resistor is gradually decrease to the braking of setting
When resistance switching frequency, step 4 is carried out；
Step 4, the braking resistor switching frequency of setting, and the side by being gradually reduced braking resistor making time t are kept
Duty ratio is gradually increased in formula.
In step 1, calculation formula is obtained by the charging and discharging currents fortran of capacitor, and the charging and discharging currents of capacitor are public
Formula is as follows:Wherein, I indicates that the transient absorption electric current of braking resistor R2, C indicate the capacitor of capacitor C1
Value.
The beneficial effects of the present invention are: the present invention when putting into operation, ensure that DC bus-bar voltage does not occur big amplitude wave
Dynamic phenomenon has good rapidity and certain stability, but also has faster dynamic responding speed, and control is opposite
Simply, to stablizing, supply conductor voltage, reduction electromagnetic pollution, cutting operating costs plays an important role.It can be by original direct current
The inductance of filter reactor reduces or removes, and substantially reduces the overall volume and production cost of device, is conducive to equipment
Installation and maintenance are conducive to the present invention in the popularization and application of subway.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
Fig. 2 is control method demonstration graph of the invention.
Specific embodiment
Further detailed description is done to the present invention with reference to the accompanying drawing:
As shown in Figure 1, a kind of braking energy absorption plant of the invention, including it is connected on DC power anode and direct current
Disconnecting switch QS1, main D.C. contactor KM1, reactor L between the cathode of source and capacitor C, main D.C. contactor KM1 are parallel with
The series arm being made of snubber contact device KM2 and resistance R1；Capacitor C1 is parallel with copped wave branch, and copped wave branch includes being connected in series
IGBT module V1 and fast recovery diode V2, fast recovery diode V2 is parallel with braking resistor R2.
A kind of control method of braking energy absorption plant of the invention, comprising the following steps:
Step 1, it determines the fluctuation range value Δ U that DC bus-bar voltage allows, calculates the maximum allowable braking resistor of single
Making time Δ t；Its calculation formula is as follows:
Wherein, I indicates that the transient absorption electric current of braking resistor R2, C indicate the capacitance of capacitor C1；
Step 2, when braking initial stage, the braking resistor switching frequency of setting is kept, and is thrown by gradually increasing braking resistor
Duty ratio is gradually increased in the mode of angle of incidence t, when braking resistor making time t is gradually increased to the throwing of maximum allowable braking resistor
When angle of incidence Δ t, step 3 is carried out；
Step 3, it keeps the making time Δ t of maximum allowable braking resistor constant, first gradually increases the switching of braking resistor
Then frequency is gradually reduced the switching frequency of braking resistor, when the switching frequency of braking resistor is gradually decrease to the braking of setting
When resistance switching frequency, step 4 is carried out；
Step 4, the braking resistor switching frequency of setting, and the side by being gradually reduced braking resistor making time t are kept
Duty ratio is gradually increased in formula.
In step 1, calculation formula is obtained by the charging and discharging currents fortran of capacitor, and the charging and discharging currents of capacitor are public
Formula is as follows:Wherein, I indicates that the transient absorption electric current of braking resistor R2, C indicate the capacitor of capacitor C1
Value.
The control method includes industry and mining city analysis, braking energy absorption dynamic regulation control.Industry and mining city analysis is to sentence
On the opportunity and condition question whether disconnected braking energy absorption plant puts into operation, be the basis of control method.Braking energy absorbs
Dynamic regulation is to solve to be adjusted in real time after braking energy absorption plant puts into operation, should guarantee connected DC grid voltage
It cannot continue to increase, not damage the equipment for being connected to DC grid, guarantee again when device puts into operation, DC bus-bar voltage
The phenomenon that there can be no fluctuations has good rapidity and certain stability.
By formula (1) as can be seen that the voltage fluctuation on capacitor is related with three factors, the instantaneous suction of braking resistor R2
Electric current I is received, the capacitance C of C1 and the time t of braking resistor investment are held.After DC grid voltage and braking resistor determine,
The transient absorption electric current of braking resistor is equal to DC voltage divided by braking resistor resistance value after braking resistor investment, can regard as
It is uncontrollable.The capacitance of capacitor is also uncontrollable after device determines.Uniquely adjustable is braking resistor
Switching time t.
Main implementation method of the invention is the fluctuation range Δ U allowed according to DC bus-bar voltage, the wink of braking resistor
When absorb electric current, capacitor capacitance can calculate the making time Δ t of the maximum allowable braking resistor of single.Master of the invention
Core is wanted to be when the braking energy of required absorption is smaller, by way of adjusting duty ratio, with required absorption
The increase of braking energy, duty ratio can gradually increase, and the time of braking resistor investment with increase, permits when it reaches maximum
When turn-on time perhaps, as the braking energy of required absorption further increases, conventional way is to further increase duty
Than increasing the time of braking resistor investment, the fluctuation of DC bus can be caused to increase in this way.In the present invention, when braking resistor
After single making time reaches permitted maximum time, it is not further added by the making time of braking resistor, but by increasing system
Move the switching frequency of resistance and the duty ratio of covert increase braking resistor investment, so can achieve both can be with Same Efficieney
The voltage fluctuation of DC grid caused by braking resistor switching can also be reduced simultaneously by absorbing braking energy.
When braking energy is relatively small, braking energy absorption plant realizes braking energy by way of adjusting duty ratio
The adjusting of absorption controls, and when braking energy is relatively large, the single making time of braking resistor passes through the output of regulating device
The mode of frequency come realize braking energy absorb adjusting control.From the foregoing it can be seen that using of the present invention
Method can reduce the inductance of the reactor L in equipment or even be removed.Can so substantially reduce equipment volume and
Cost.
The above is only the preferred embodiment of this patent, it is noted that for the ordinary skill people of the art
For member, under the premise of not departing from the art of this patent principle, several improvement and replacement can also be made, these are improved and replacement
Also it should be regarded as the protection scope of this patent.
Claims (2)
1. a kind of control method of braking energy absorption plant, it is characterised in that: including being connected on DC power anode and direct current
Disconnecting switch QS1, main D.C. contactor KM1, reactor L and capacitor C1 between power cathode, the main direct current contact
Device KM1 is parallel with the series arm being made of snubber contact device KM2 and resistance R1；The capacitor C1 is parallel with copped wave branch
Road, the copped wave branch include the IGBT module V1 being connected in series and fast recovery diode V2, the fast recovery diode V2
It is parallel with braking resistor R2；
The control method of the braking energy absorption plant, comprising the following steps:
Step 1, it determines the fluctuation range value Δ U that DC bus-bar voltage allows, calculates the throwing of the maximum allowable braking resistor of single
Angle of incidence Δ t；Its calculation formula is as follows:
Wherein, I indicates that the transient absorption electric current of braking resistor R2, C indicate the capacitance of capacitor C1；
Step 2, when braking initial stage, the braking resistor switching frequency of setting is kept, and by gradually increasing braking resistor investment
Duty ratio is gradually increased in the mode of time t, when braking resistor making time t is gradually increased to maximum allowable braking resistor
When making time Δ t, step 3 is carried out；
Step 3, it keeps the making time Δ t of maximum allowable braking resistor constant, first gradually increases the switching frequency of braking resistor,
Then it is gradually reduced the switching frequency of braking resistor, when the braking resistor that the switching frequency of braking resistor is gradually decrease to setting is thrown
When cutting frequency, step 4 is carried out；
Step 4, keep setting braking resistor switching frequency, and by way of being gradually reduced braking resistor making time t by
Gradually improve duty ratio.
2. the control method of the braking energy absorption plant according to claim 1, it is characterised in that: in step 1, meter
It calculates formula to be obtained by the charging and discharging currents fortran of capacitor, the charging and discharging currents formula of capacitor is as follows:
Wherein, I indicates that the transient absorption electric current of braking resistor R2, C indicate the capacitance of capacitor C1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610873511.3A CN106364328B (en) | 2016-09-30 | 2016-09-30 | Braking energy absorption plant and its control method |
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| CN201610873511.3A CN106364328B (en) | 2016-09-30 | 2016-09-30 | Braking energy absorption plant and its control method |
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| CN106364328B true CN106364328B (en) | 2019-04-02 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5841647A (en) * | 1996-10-07 | 1998-11-24 | Kabushiki Kaisha Toshiba | Power conversion system |
| CN104333038A (en) * | 2014-11-05 | 2015-02-04 | 株洲时代装备技术有限责任公司 | Method and device for recovering mixed regenerative energy of urban railway power supply system |
| CN206155196U (en) * | 2016-09-30 | 2017-05-10 | 新风光电子科技股份有限公司 | Braking energy absorbing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2974347B2 (en) * | 1989-12-08 | 1999-11-10 | キヤノン株式会社 | Flash photography system |
| JP2004274801A (en) * | 2003-03-05 | 2004-09-30 | Toshiba Corp | Inverter circuit |
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2016
- 2016-09-30 CN CN201610873511.3A patent/CN106364328B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5841647A (en) * | 1996-10-07 | 1998-11-24 | Kabushiki Kaisha Toshiba | Power conversion system |
| CN104333038A (en) * | 2014-11-05 | 2015-02-04 | 株洲时代装备技术有限责任公司 | Method and device for recovering mixed regenerative energy of urban railway power supply system |
| CN206155196U (en) * | 2016-09-30 | 2017-05-10 | 新风光电子科技股份有限公司 | Braking energy absorbing device |
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| CN106364328A (en) | 2017-02-01 |
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Address after: Jin Cheng Road northbound middle 272500 Shandong province Wenshang County Economic Development Zone Patentee after: Shandong Xinfengguang Electronic Technology Development Co., Ltd. Address before: The Middle Road Economic Development Zone, Shandong city of Jining Province Jin Cheng Road 272500 Patentee before: Shandong Xinfengguang Electronic Technology Development Co., Ltd. |
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