CN209709688U - A kind of controlling device that rail traffic low-voltage system voltage temporarily drops - Google Patents
A kind of controlling device that rail traffic low-voltage system voltage temporarily drops Download PDFInfo
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- CN209709688U CN209709688U CN201920558766.XU CN201920558766U CN209709688U CN 209709688 U CN209709688 U CN 209709688U CN 201920558766 U CN201920558766 U CN 201920558766U CN 209709688 U CN209709688 U CN 209709688U
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Abstract
The utility model discloses a kind of controlling devices that rail traffic low-voltage system voltage temporarily drops, comprising: DC/DC converter, Support Capacitor C1, inversion unit, LCL filter, two-way anti-parallel thyristor and control circuit；Wherein: DC/DC converter one end connects 1500V DC bus, and the other end passes through Support Capacitor C1It is connected with inversion unit, control circuit signal input part connects 35/0.4kV transformer, and control terminal is separately connected two-way anti-parallel thyristor and inverter circuit.The controlling device can eliminate voltage dip influence caused by low-voltage load safe and stable operation.
Description
Technical field
It is temporarily dropped the utility model relates to technical field of power systems more particularly to a kind of rail traffic low-voltage system voltage
Controlling device.
Background technique
Common power quality problem generally comprises voltage swell, voltage dip, short interruptions, three in modern power systems
Mutually uneven and harmonic wave interference etc..In these power quality problems, the most forms of frequency it is most severe be exactly that voltage is temporary
Drop problem.Voltage dip is occurred more frequently compared to voltage interruption, and voltage interruption is confined to some area or region, and
Voltage dip can but be caused by the transmission system failure outside several hundred kilometers, it is endangered caused by sensitive load and voltage interruption is
The same.Although the voltage dip duration is short, there are a large amount of sensitive loads in rail traffic low-pressure system, such as communicate
Equipment and part special equipment, once voltage dip, which occurs, to pacify the life of the operation of the normal table of equipment and the people
It is complete to generate grave danger.
It can be seen that, it is necessary to it takes appropriate measures to solve the problems, such as that rail traffic low-voltage system voltage temporarily drops.For electricity
The improvement temporarily dropped is pressed, includes: at present that (solid-state switching is opened by UPS (uninterruptible power supply), SSTS using controlling device the most universal
Close), DVR (dynamic electric voltage recovery device).UPS energy-storage battery maintenance cost is excessively high in three of the above device and is not suitable for high-power
Place, SSTS need backup power source as precondition, and DVR then has compared with high performance-price ratio and can compensate within the Millisecond time
The voltage dip of system.But traditional DVR generally has preferable regulation effect within grid voltage sags 50%, once
Grid voltage sags are to 50% hereinafter, or when interrupting completely, traditional DVR is due to the topological structure of itself, stored energy capacitance and defeated
The limitation of power will be unable to carry out effective compensation out.
Utility model content
The purpose of the utility model is to provide a kind of controlling devices that rail traffic low-voltage system voltage temporarily drops, to eliminate
Voltage dip is influenced caused by low-voltage load safe and stable operation.
The purpose of this utility model is achieved through the following technical solutions:
A kind of controlling device that rail traffic low-voltage system voltage temporarily drops, comprising: DC/DC converter, Support Capacitor C1, it is inverse
Become unit, LCL filter, two-way anti-parallel thyristor and control circuit；Wherein:
DC/DC converter one end connects 1500V DC bus, and the other end passes through Support Capacitor C1It is connected with inversion unit,
Control circuit signal input part connection 35kV turns 0.4kV transformer, and control terminal is separately connected two-way anti-parallel thyristor and inverse
Power transformation road.
It can be fine by the novel circuit topological of proposition it can be seen from above-mentioned technical solution provided by the utility model
Ground solves depth Problem of Voltage Temporary-Drop, and is not necessarily to energy-storage module, rectification unit and grid-connected transformer, greatly reduces improvement dress
It is set to this, economy with higher.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical solution of the utility model embodiment
The attached drawing used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the utility model
Example, for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other accompanying drawings.
Fig. 1 is rail traffic tractive power supply system grid structure figure provided by the embodiment of the utility model；
Fig. 2 is a kind of controlling device structure that rail traffic low-voltage system voltage temporarily drops provided by the embodiment of the utility model
Schematic diagram；
Fig. 3 is the working principle diagram of controlling device provided by the embodiment of the utility model；
Fig. 4 is the design method schematic diagram of device parameters provided by the embodiment of the utility model.
Specific embodiment
Below with reference to the attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu is fully described by, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole realities
Apply example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work
The every other embodiment obtained, belongs to the protection scope of the utility model.
The grid structure of rail traffic tractive power supply system such as Fig. 1, there are multiple 110/35kV transformers in the system, often
There is the 35kV bus of multistage paired running to pass through rectifier transformer DC bus powered, this design for 1500V under a transformer
Mode substantially increases DC bus powered reliability.
The utility model embodiment proposes that a kind of rail traffic is low based on the grid structure of rail traffic tractive power supply system
The controlling device that pressure system voltage temporarily drops, as shown in Fig. 2, it includes: DC/DC converter, Support Capacitor C that it, which is specifically included that,1, it is inverse
Become unit (i.e. AC/DC in Fig. 2), LCL filter, two-way anti-parallel thyristor and control circuit.Circuit connecting mode is such as
Under: DC/DC converter one end connects 1500V DC bus, and the other end passes through Support Capacitor C1It is connected with inversion unit, inversion list
Member accesses 0.4kV low-pressure system by LCL filter；Control circuit signal input part connects 35/0.4kV transformer, control terminal
It is separately connected two-way anti-parallel thyristor and inverter circuit；
The control circuit is using 35/0.4kV step down side voltage as input signal, to two-way anti-parallel thyristor
And inverter circuit is controlled.
The utility model embodiment above scheme is substituted by the DC bus using rail traffic tractive power supply system
The energy-storage module of traditional DVR, and series transformer needed for DVR access system is omitted, greatly reduce controlling device cost,
Economy with higher.
In order to make it easy to understand, being introduced below for working principle.
As shown in Fig. 2, low-pressure system has two power supply branches, first is 35KV bus through 35/0.4kV transformer-supplied
(referred to as former power supply branch), Article 2 is that 1500V DC bus is supplied through DC/DC, Support Capacitor, inversion unit, LCL filter
Electricity.The working principle of controlling device is as shown in figure 3, by voltage detection unit real-time detection network voltage, to judge whether to occur
Voltage temporarily will；When occur voltage temporarily by when, two-way anti-parallel thyristor has been sealed in by low-pressure system total input-wire, therefore, by stopping
Information only is controlled to thyristor to interrupt first branch, and Article 2 branch is controlled by output voltage control unit and gives low pressure system
System power supply；When system voltage restores normal, low-voltage system voltage phase angle theta1, and inverter output voltage phase angle theta2, to eliminate two
Phase angle difference between person makes inverter output voltage phase angle and system voltage kissing by controlling inverter output voltage frequency
It closes, then switches to first branch power supply.
In addition, the design method of device parameters is provided below, as shown in Figure 4 to improve the reliability of controlling device.
1, Support Capacitor parameter.
If allowing Support Capacitor both end voltage in Umin~UmaxFluctuation, inversion unit output power are P, then Support Capacitor is most
Low-capacitance are as follows:
Wherein, fRFor 1500V DC bus-bar voltage vibration frequency.
2, LCL filter parameter.
As shown in Fig. 2, LCL filter specifically includes that two inductance interconnected, and it is connected between two inductance
Filter capacitor.
In order not to make the resonance peak of LCL filter appear in low frequency or high band, when designing the resonance frequency of filter, answer
10 times of mains frequency should be greater than, be less than switching frequency 1/2.
The resonance frequency of LCL filter are as follows:
Wherein, L1For the inductance value of inversion unit side, L2For the inductance value of load side, C2For the capacitance of filter capacitor；
It is no more than the constraint condition of Support Capacitor both end voltage 10%, the total inductance value of LCL filter according to inductive drop
Meet:
In formula, IsElectric current is exported for inversion unit；f1For power grid fundamental frequency.
According to the inductance value L of maximum allowable ripple conditional decision inversion unit side inductance1:
Wherein, UdcFor Support Capacitor both end voltage；fcFor inversion unit switching frequency；ΔimaxFlow through Support Capacitor
Maximum allowable ripple current.ΔimaxElectric current setting, typically not greater than 0.2I are exported according to inversion units。
In order to avoid the power factor of parallel network reverse unit excessively reduces, the First Harmonic Reactive Power that filter capacitor absorbs cannot
Greater than the 5% of system nominal active power, therefore, the capacitance C of filter capacitor2Meet:
Wherein, EmFor power grid phase voltage virtual value；f1For power grid fundamental frequency；λ is the fundamental wave reactive power function that filter capacitor absorbs
Inversion unit output power shared by rate is the ratio of P.
It is introduced below using a specific application scenarios as example.It should be noted that institute in following examples
The numerical value of use is only for example, and user can do corresponding change according to actual demand.
In this example, dynamic electric voltage recovery device is used to the voltage dip administered on the 0.4kV bus of rail traffic low-voltage platform area
Problem.Wherein during low-voltage load normal electricity consumption, average apparent energy S=389.51kVA, average active power is (that is, inversion list
First output power) P=307.71kW, load average power-factor cos θ.
According to data provided by governing system, making following design to each component parameters of controlling device above:
Support Capacitor both end voltage is designed as Udc=320V, Support Capacitor both end voltage allowable fluctuation range are no more than Udc
5%.Then Support Capacitor both end voltage maximum value:
Umax=320 × (1+2.5%)=328V
Support Capacitor both end voltage minimum value:
Umax=320 × (1-2.5%)=312V
It is as follows to Support Capacitor parameter designing:
When to LCL filter parameter designing, if filter capacitor value is excessive to will lead to a large amount of reactive current injection filters
Wave capacitor, so that inversion unit output electric current increases, to increase system loss, so the fundamental wave reactive power function that filter capacitor absorbs
Rate cannot generally be greater than the 5% of system active power, and filter capacitor capacitance calculates as follows:
Entering port filter total inductance should meet:
According to the maximum allowable ripple conditional decision inversion unit side inductance L of net side1Value:
Design filter resonance frequency fres=2kHz, filter capacitor C2=400 μ F, total inductance L=0.2mH can be obtained
It arrives:
Then it is as follows equation group can be obtained:
In order to shunt to higher harmonic current caused by inversion unit switching frequency, it is made more to flow through capacitor branch
Road, therefore design net side inductance L2When, X should be metC2<<XL2, wherein XL2, XC2It is L2, C2Impedance value at switching frequency.
Filter capacitor is in fcThe capacitive reactance at place:
Net side inductance is in fcThe induction reactance at place: XL2=h ω L2=200 × 100 π × 0.182 × 10-3=11.43 Ω
It can be seen that XC2<<XL2, which can play preferable shunting function to higher hamonic wave.
To sum up, designed component parameters out are respectively as follows:
Support Capacitor: C1=7000 μ F
Filter capacitor: C2=400 μ F
Inversion unit side inductance: L1=0.018mH
Load side inductance: L2=0.182mH
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art can readily occur in the technical scope that the utility model discloses
Change or replacement, should be covered within the scope of the utility model.Therefore, the protection scope of the utility model should
Subject to the scope of protection of the claims.
Claims (3)
1. a kind of controlling device that rail traffic low-voltage system voltage temporarily drops characterized by comprising DC/DC converter, support
Capacitor C1, inversion unit, LCL filter, two-way anti-parallel thyristor and control circuit；Wherein:
DC/DC converter one end connects 1500V DC bus, and the other end passes through Support Capacitor C1It is connected with inversion unit, control electricity
Road signal input part connects 35/0.4kV transformer, and control terminal is separately connected two-way anti-parallel thyristor and inverter circuit.
2. a kind of controlling device that rail traffic low-voltage system voltage temporarily drops according to claim 1, which is characterized in that institute
Stating inversion unit is AC/DC converter.
3. a kind of controlling device that rail traffic low-voltage system voltage temporarily drops according to claim 1, which is characterized in that institute
Stating LCL filter includes: two inductance interconnected, and the filter capacitor being connected between two inductance.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110011305A (en) * | 2019-04-23 | 2019-07-12 | 安徽大学 | A kind of controlling device that rail traffic low-voltage system voltage temporarily drops |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110011305A (en) * | 2019-04-23 | 2019-07-12 | 安徽大学 | A kind of controlling device that rail traffic low-voltage system voltage temporarily drops |
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