CN209184487U - A kind of DC chopped-wave device - Google Patents
A kind of DC chopped-wave device Download PDFInfo
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- CN209184487U CN209184487U CN201821831813.5U CN201821831813U CN209184487U CN 209184487 U CN209184487 U CN 209184487U CN 201821831813 U CN201821831813 U CN 201821831813U CN 209184487 U CN209184487 U CN 209184487U
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- power semiconductor
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Abstract
The utility model discloses a kind of DC chopped-wave device, device is made of at least two equidirectional series connections of pressure energy consumption unit, and the anode of described device connect with the anode of DC line, the connection of the cathode of the cathode of device and DC line；The pressure energy consumption unit is constituted by pressing branch and nonlinear resistance to be connected in parallel, and the pressure branch routes at least one and submodule and energy consumption resistor series connection is pressed to constitute, and the pressure submodule is made of at least one power semiconductor switch with capacitor；The invention also discloses a kind of control methods based on DC chopped-wave device, the DC chopped-wave device is connected in parallel between the positive and negative electrode of middle high-pressure DC line, when AC line voltage increases, voltage value can be born by bypassing a part remaining unit of pressure energy consumption unit change, nonlinear resistance is set to absorb energy, device cost performance is very high, high reliablity, it is easy to accomplish.
Description
Technical field
The utility model belongs to High Power Electronic Converter Technology field, and in particular to a kind of DC chopped-wave device.
Background technique
In HVDC transmission system, DC chopped-wave device is vital equipment.DC chopped-wave device is mainly answered
For the application scenarios of island power supply, if power generation end is the inertia power supply similar with wind-powered electricity generation, when receiving end breaks down, by
It can not be sent out in power, the voltage of DC power transmission line will be caused to increase, the safe operation to equipment in DC side cumlative energy
It causes damages.
In the prior art, the method for use is to pass through the control of power electronic devices, investment electricity when DC voltage is excessively high
Resistance, the investment of resistance will be such that DC voltage declines, when the energy consumption speed of resistance is more than the speed of DC side cumlative energy, direct current
Pressure will decline, at this point, going to shutdown conductive discharge circuit again, DC voltage rises again, repeatedly turn on and off resistance branch,
The problem of effect of formation Hysteresis control, this method is primarily present is: on the one hand, resistance quickly puts into and exits needs simultaneously
Join power semiconductor switch, when off, since multiple power semiconductor switches simultaneously turn off it is difficult to ensure that consistent
Property, it easily bears overvoltage and damages.On the other hand, since resistance value is fixed, the size of resistance value in the way of resistance energy consumption
Directly affect the effect of energy consumption, once be mainly reflected in resistance value choose it is too small, the electric current for flowing through resistance is excessive, increase resistance at
Sheet and volume, if resistance value selection is excessive, the electric current for flowing through resistance is too small, makes slowing for energy consumption, or even will appear resistance
Energy consumption speed be less than DC side cumlative energy speed, can not consume energy at this time, dangerous.
Utility model content
To solve the above-mentioned problems, the utility model proposes the controls of a kind of DC chopped-wave device and use above-mentioned apparatus
Method processed, device are connected in parallel between the positive and negative electrode of middle high-pressure DC line, are put into the control exited to pressure energy consumption unit, are adjusted
The quantity of the whole pressure energy consumption unit being connected in parallel between route, makes nonlinear resistance consume energy, device cost performance is very high, and solves
The problem of uneven disjunction voltage in the prior art and resistance difficulty value of having determined.
In order to achieve the above objectives, the specific scheme that the utility model uses is as follows:
Described device is made of at least two equidirectional series connections of pressure energy consumption unit, and the head end of the series connection is fixed
Justice is that the tail end of positive, the described series connection of device is defined as the cathode of device；The anode of described device and DC line
The low-potential electrode (cathode) that high-potential electrode connects (anode), the cathode of device and DC line connects；The pressure energy consumption
Unit is constituted by pressing branch and nonlinear resistance to be connected in parallel, and the pressure branch routes at least one and submodule series connection is pressed to connect
Composition is connect, the pressure submodule is made of at least one power semiconductor switch with capacitor.
Wherein, the pressure branch is also connected an energy consumption resistor.
Wherein, the pressure submodule includes the first and second power semiconductor switch and DC capacitor, wherein the
One, two power semiconductor switch series aiding connections connect, and connection type is one of following two:
1: the first power semiconductor switch collector of connection type is connect with DC capacitor anode, and the second power is partly led
Body switching device emitter is connect with DC capacitor cathode；
2: the second power semiconductor switch collector of connection type is connect with DC capacitor anode, and the first power is partly led
Body switching device emitter is connect with DC capacitor cathode；
The collector of second power semiconductor switch is defined as pressing the anode of submodule, and the second power is partly led
The emitter of body switching device is defined as pressing the cathode of submodule；The power semiconductor switch has two pole of inverse parallel
Pipe.
Wherein, the pressure submodule include third and fourth, five, six power semiconductor switches and DC capacitor, institute
It states third and fourth power semiconductor switch series aiding connection and connects and composes the first bridge arm, the five, the six power semiconductor switches
Series aiding connection connects and composes the second bridge arm；Third, five power semiconductor switch collectors are connect with DC capacitor anode, the
Four, six power semiconductor switch emitters are connect with DC capacitor cathode；The midpoint of first bridge arm and the second bridge arm
It is defined as pressing the positive electrode and negative electrode of submodule；The power semiconductor switch has anti-paralleled diode.
Wherein, the pressure submodule includes at least one the 7th power semiconductor switch, the 7th power half
Conductor switching device has anti-paralleled diode.
Wherein, the pressure submodule includes the 8th power semiconductor switch, diode and DC capacitor；It is described
8th power semiconductor switch has anti-paralleled diode, and diode is connected company with the 8th power semiconductor switch
It connects, connection type is one of following two:
Connection type 1: the anode connection of cathode and DC capacitor of diode, anode and the 8th power of diode are partly led
The collector of body switching device connects, and the emitter of the 8th power semiconductor switch and the cathode of DC capacitor connect；
The collector of 2: the eight power semiconductor switch of connection type and the anode of DC capacitor connect, the 8th power
The emitter of semiconductor switch device and the cathode of diode connect, and the anode of diode and the cathode of DC capacitor connect；
The collector of 8th power semiconductor switch is defined as pressing the anode of submodule, and the 8th power is partly led
The emitter of body switching device is defined as pressing the cathode of submodule.
Wherein, pressure energy consumption unit equalizing resistance also in parallel.
Wherein, pressure energy consumption unit by-pass switch also in parallel.
Wherein, the DC chopped-wave device is also connected at least one cutoff switch.
The utility model has the beneficial effects that
1, the utility model proposes DC chopped-wave device be connected in parallel between the positive and negative electrode of middle high-pressure DC line, work as institute
When over-voltage occurs for the DC line of connection, by putting into the control exited to pressure energy consumption unit, adjustment is connected in parallel between route
Pressure energy consumption unit quantity, change each pressure energy consumption unit both end voltage, each pressure energy consumption unit is in parallel non-
Nonlinear resistance can be improved by reducing the quantity of pressure energy consumption unit of investment when requiring the expenditure of energy in linear resistance
Voltage is born, when reaching nonlinear resistance movement threshold value, electric current increases, and nonlinear resistance absorbs energy, meanwhile, non-linear electricity
Resistance play the role of voltage clamping, it is ensured that pressure energy consumption unit will not over-voltage breakdown, this method is simple, risk is small, reliably
Property it is high.
2, nonlinear resistance is preferably utilized when bearing voltage value difference in the utility model, the sharply change of equivalent resistance
Change, forms the difference on electric current, so that it can be connected in parallel on DC line, under rated voltage, the electric current flowed through is minimum, and
As voltage is more than operation voltage threshold, resistance value is strongly reduced, and keeps the control of energy consumption more flexible, it is thus only necessary to control investment
Voltage control can be realized in the quantity of pressure energy consumption unit.And since resistance value is fixed, resistance value in the way of resistance energy consumption
Size directly affect the effect of energy consumption, once be mainly reflected in resistance value choose it is too small, the electric current for flowing through resistance is excessive, increase electricity
The cost and volume of resistance, if resistance value selection is excessive, the electric current for flowing through resistance is too small, makes slowing for energy consumption.
3, the pressure energy consumption unit on-fixed put into, can carry out cyclic shift, in number according to the principle of energy mean consumption
Measure it is constant under the premise of constantly switch, realize energy uniformly consume.
4, the pressure submodule in the utility model transfer branch uses modular mode, is readily produced manufacture.Press
Submodule parallel connection by-pass switch can rapidly bypass malfunctioning module in module failure, in submodule configuration quantity
The operational reliability of device can be greatly improved there are certain allowance.
5, the bypass resistance unit in the utility model both can limit charging current when device starts, meanwhile, it is filling
When setting consumption energy, energy consumption circuit can be sealed in, it, can be according to the size of energy consumption electric current as the supplement of nonlinear resistance energy consumption mode
The quantity for selecting investment puts into more bypass resistances when the electric current that consumes energy is excessive, and circuit total resistance value increases, and electric current is corresponding
It reduces, shares part energy for nonlinear resistance；The application of nonlinear resistance and linear resistance has been implemented in combination with optimal consumption
It can effect.
Detailed description of the invention
Fig. 1 is the topology diagram of the utility model DC chopped-wave device.
Fig. 2 is the first embodiment for pressing submodule of the utility model, and a and b are two kinds of connection types.
Fig. 3 is the second embodiment for pressing submodule of the utility model.
Fig. 4 is the 3rd embodiment for pressing submodule of the utility model.
Fig. 5 is the fourth embodiment for pressing submodule of the utility model, and a and b are two kinds of connection types.
Fig. 6 is a kind of charge mode schematic diagram for pressing submodule of the utility model.
Fig. 7 is a kind of bypass mode schematic diagram for pressing submodule of the utility model.
Fig. 8 is the first energy consumption mode of the utility model embodiment.
Fig. 9 is the second energy consumption mode of the utility model embodiment.
Figure label title: 1, DC chopped-wave device；2, energy consumption unit is pressed；3, submodule is pressed；4, nonlinear resistance；
5, equalizing resistance；6, by-pass switch；7, energy consumption resistor；8, cutoff switch.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
As shown in Figure 1, the utility model DC chopped-wave device 1 is connected by at least two pressure energy consumption equidirectional series connection of unit 2
Composition is connect, the tail end that the head end of the series connection is defined as positive, the described series connection of device is defined as the cathode of device；
The anode of described device connect with the anode of DC line, the connection of the cathode of the cathode of device and DC line；The pressure consumption
Can unit by pressing branch and nonlinear resistance 4 to be connected in parallel and constitute, it is described pressure branch route at least one press submodule 3 and
Energy consumption resistor 7, which is connected in series, to be constituted, and the pressure submodule is made of at least one power semiconductor switch with capacitor.
As shown in Fig. 2, pressure the first embodiment of submodule includes the first and second power semiconductor switch and direct current
Capacitor, wherein the connection of the first and second power semiconductor switch series aiding connection, connection type are one of following two:
1: the first power semiconductor switch collector of connection type is connect with DC capacitor anode, and the second power is partly led
Body switching device emitter is connect with DC capacitor cathode；
2: the second power semiconductor switch collector of connection type is connect with DC capacitor anode, and the first power is partly led
Body switching device emitter is connect with DC capacitor cathode；
The collector of second power semiconductor switch is defined as pressing the anode of submodule, and the second power is partly led
The emitter of body switching device is defined as pressing the cathode of submodule；The power semiconductor switch has two pole of inverse parallel
Pipe.
As shown in figure 3, pressure second of embodiment of submodule include third and fourth, five, six power semiconductor switches with
And DC capacitor, third and fourth described power semiconductor switch series aiding connection connect and compose the first bridge arm, the five, the six power
Semiconductor switch device series aiding connection connects and composes the second bridge arm；Third, five power semiconductor switch collectors and direct current
Capacitance cathode connection, the four, the six power semiconductor switch emitters are connect with DC capacitor cathode；First bridge arm with
The midpoint of second bridge arm is defined as pressing the positive electrode and negative electrode of submodule；The power semiconductor switch has inverse parallel two
Pole pipe.
As shown in figure 4, pressure the third embodiment of submodule includes at least one the 7th power semiconductor switch, institute
The 7th power semiconductor switch is stated with anti-paralleled diode.
As shown in figure 5, pressure the 4th kind of embodiment of submodule include the 8th power semiconductor switch, diode and
DC capacitor；8th power semiconductor switch has anti-paralleled diode, and diode is opened with the 8th power semiconductor
Devices in series connection is closed, connection type is one of following two:
Connection type 1: the anode connection of cathode and DC capacitor of diode, anode and the 8th power of diode are partly led
The collector of body switching device connects, and the emitter of the 8th power semiconductor switch and the cathode of DC capacitor connect；
The collector of 2: the eight power semiconductor switch of connection type and the anode of DC capacitor connect, the 8th power
The emitter of semiconductor switch device and the cathode of diode connect, and the anode of diode and the cathode of DC capacitor connect；
The collector of 8th power semiconductor switch is defined as pressing the anode of submodule, and the 8th power is partly led
The emitter of body switching device is defined as pressing the cathode of submodule.
Wherein, the pressure energy consumption unit can be with an equalizing resistance 5 in parallel.Equalizing resistance can be further assured that each
The equalizing effect of energy consumption unit.
Wherein, the pressure energy consumption unit can be with a by-pass switch 6 in parallel.When pressure energy consumption unit breaks down
When, trouble unit can be bypassed by by-pass switch, not influence other and energy consumption unit is pressed to operate normally.
Wherein, the DC chopped-wave device is also connected at least one cutoff switch 8.It is available when device is out of service
Cutoff switch is isolated by device with DC line.
Fig. 6 is a kind of charge mode schematic diagram for pressing submodule of the utility model, when the down tube of half-bridge module turns off
When, it is submodule capacitor charging by current loop as shown in FIG. 6, since capacitance parameter is consistent, multiple pressure submodules are logical
Cross the effect that capacitor is pressed.
Fig. 7 is that a kind of bypass mode schematic diagram for pressing submodule of the utility model presses submodule when needing to bypass
The down tube of block is connected, and entirely pressure submodule is bypassed by down tube, since there are anti-paralleled diodes for upper tube, protects during bypass
Hold that down tube is in an off state, the voltage of capacitor is maintained, without will form short circuit.
Illustrate the composition and application method of the utility model by specific embodiment:
In embodiment, DC power transmission line cathode voltage be 200kV, cathode voltage be -200kV, pressure difference 400kV,
Device includes 100 and presses energy consumption units altogether, and each pressure energy consumption unit bears voltage rating 4kV, each presses energy consumption unit
A nonlinear resistance in parallel, the operation voltage threshold of nonlinear resistance is in 6kV, therefore, then flows through the electricity of nonlinear resistance
It flows minimum, can be ignored.
If line voltage distribution is still higher than voltage control target upper limit value 420kV, it is 390kV that voltage, which controls target lower limit value,
When line voltage distribution is more than 430kV: choosing the pressure energy consumption unit of the first quantity, in the present embodiment, choose 33 pressure consumptions
The IGBT that submodule is pressed in selected pressure energy consumption unit is connected in energy unit, and remaining 67 are pressed the unit that consumes energy, and are shared
430kV voltage, each pressure energy consumption unit shares voltage 6.4kV, more than the operation voltage threshold of nonlinear resistance, starts to absorb
Energy limits line over-voltage.As shown in figure 8, the nonlinear resistance investment of a part pressure energy consumption unit, a part pressure consumption
Energy unit is in the state being bypassed.
If line voltage distribution is still higher than voltage control target upper limit value, continue the pressure energy consumption unit for opening the second quantity,
The second quantity chooses 3 in the present embodiment；If line voltage distribution controls target lower limit value, the third that will have been opened lower than voltage
Quantity presses energy consumption unit shutdown, and in the present embodiment, third quantity chooses 3.The pressure of second quantity and third quantity consumption
Energy unit switching control plays the role of fine tuning.
Wherein: the pressure energy consumption unit on-fixed chosen is chosen, can be according to the principle of energy mean consumption, in quantity
Constantly target is chosen in switching under the premise of constant, and as shown in Figure 8 and Figure 9, under two kinds of different modes, quantity is constant, and that chooses is equal
Pressure energy consumption unit is different unit.
Above embodiments are merely to illustrate the technical solution of the utility model rather than its limitations, referring to above-described embodiment into
Capable various forms modification or change both are within the protection scope of the present invention.
Claims (9)
1. a kind of DC chopped-wave device, which is characterized in that described device is connected by at least two equidirectional series connection of pressure energy consumption unit
Composition is connect, the tail end that the head end of the series connection is defined as positive, the described series connection of device is defined as the cathode of device；
The anode of described device connect with the high-potential electrode of DC line, the low-potential electrode of the cathode of device and DC line company
It connects；The pressure energy consumption unit is constituted by pressing branch and nonlinear resistance to be connected in parallel, and the pressure branch routes at least one
Pressure submodule, which is connected in series, is constituted, and the pressure submodule is made of at least one power semiconductor switch with capacitor.
2. a kind of DC chopped-wave device as described in claim 1, it is characterised in that: the pressure branch is also connected an energy consumption
Resistance.
3. a kind of DC chopped-wave device as described in claim 1, it is characterised in that: the pressure submodule includes first and second
Power semiconductor switch and DC capacitor, wherein the connection of the first and second power semiconductor switch series aiding connection, even
Connecing mode is one of following two:
1: the first power semiconductor switch collector of connection type is connect with DC capacitor anode, and the second power semiconductor is opened
Device emitter is closed to connect with DC capacitor cathode；
2: the second power semiconductor switch collector of connection type is connect with DC capacitor anode, and the first power semiconductor is opened
Device emitter is closed to connect with DC capacitor cathode；
The collector of second power semiconductor switch is defined as pressing the anode of submodule, and the second power semiconductor is opened
The emitter for closing device is defined as pressing the cathode of submodule；The power semiconductor switch has anti-paralleled diode.
4. a kind of DC chopped-wave device as described in claim 1, it is characterised in that: the pressure submodule includes third and fourth,
Five, six power semiconductor switches and DC capacitor, third and fourth power semiconductor switch series aiding connection connection
The first bridge arm is constituted, the five, the six power semiconductor switch series aiding connections connect and compose the second bridge arm；Third, five power half
Conductor switching device collector is connect with DC capacitor anode, the four, the six power semiconductor switch emitters and direct current
Hold cathode connection；The midpoint of first bridge arm and the second bridge arm is defined as pressing the positive electrode and negative electrode of submodule；The power
Semiconductor switch device has anti-paralleled diode.
5. a kind of DC chopped-wave device as described in claim 1, it is characterised in that: the pressure submodule includes at least one
7th power semiconductor switch, the 7th power semiconductor switch have anti-paralleled diode.
6. a kind of DC chopped-wave device as described in claim 1, it is characterised in that: the pressure submodule includes the 8th power
Semiconductor switch device, diode and DC capacitor；8th power semiconductor switch has anti-paralleled diode,
Diode and the 8th power semiconductor switch are connected in series, and connection type is one of following two:
Connection type 1: the anode connection of cathode and DC capacitor of diode, anode and the 8th power semiconductor of diode are opened
The collector connection of device is closed, the emitter of the 8th power semiconductor switch and the cathode of DC capacitor connect；
The collector of 2: the eight power semiconductor switch of connection type and the anode of DC capacitor connect, and the 8th power is partly led
The emitter of body switching device and the cathode of diode connect, and the anode of diode and the cathode of DC capacitor connect；
The collector of 8th power semiconductor switch is defined as pressing the anode of submodule, and the 8th power semiconductor is opened
The emitter for closing device is defined as pressing the cathode of submodule.
7. a kind of DC chopped-wave device as described in claim 1, it is characterised in that: the pressure energy consumption unit is also one in parallel
Equalizing resistance.
8. a kind of DC chopped-wave device as described in claim 1, it is characterised in that: the pressure energy consumption unit is also one in parallel
By-pass switch.
9. a kind of DC chopped-wave device as described in claim 1, it is characterised in that: the DC chopped-wave device is also connected at least
One cutoff switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821831813.5U CN209184487U (en) | 2018-11-07 | 2018-11-07 | A kind of DC chopped-wave device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821831813.5U CN209184487U (en) | 2018-11-07 | 2018-11-07 | A kind of DC chopped-wave device |
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| CN209184487U true CN209184487U (en) | 2019-07-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274269A (en) * | 2018-11-07 | 2019-01-25 | 王宇 | A kind of DC chopped-wave device and control method |
-
2018
- 2018-11-07 CN CN201821831813.5U patent/CN209184487U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109274269A (en) * | 2018-11-07 | 2019-01-25 | 王宇 | A kind of DC chopped-wave device and control method |
| CN109274269B (en) * | 2018-11-07 | 2021-08-27 | 王宇 | Direct-current chopping device and control method |
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