CN109274269A - A kind of DC chopped-wave device and control method - Google Patents
A kind of DC chopped-wave device and control method Download PDFInfo
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- CN109274269A CN109274269A CN201811316766.5A CN201811316766A CN109274269A CN 109274269 A CN109274269 A CN 109274269A CN 201811316766 A CN201811316766 A CN 201811316766A CN 109274269 A CN109274269 A CN 109274269A
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- power semiconductor
- energy consumption
- semiconductor switch
- submodule
- pressure
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention 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 invention belongs to High Power Electronic Converter Technology fields, and in particular to a kind of DC chopped-wave device and controlling party
Method.
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.
Summary of the invention
To solve the above-mentioned problems, the invention proposes a kind of DC chopped-wave device and the controlling parties of use above-mentioned apparatus
Method, device are connected in parallel between the positive and negative electrode of middle high-pressure DC line, put into the control exited to pressure energy consumption unit, adjustment is simultaneously
It is associated in the quantity of the pressure energy consumption unit between route, so that nonlinear resistance is consumed energy, device cost performance is very high, and solves
The problem of disjunction voltage is uneven in the prior art and resistance difficulty value.
In order to achieve the above objectives, the specific scheme that the present invention 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 presses submodule and energy consumption
Resistance series connection connects and composes, and the pressure submodule is made of at least one power semiconductor switch with capacitor.
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 invention also includes a kind of control methods of DC chopped-wave device:
(1) when starting with device, described method includes following steps:
Step 1: the power semiconductor switch shutdown pressed in submodule, the switching switch separate, partition
Switch separates；
Step 2: after DC line electrification, being closed cutoff switch, pass through direct current of the bypass resistance into pressure submodule
Capacity charge；
Step 3: after the completion of to be charged, closure switching switch bypasses bypass resistance.
(2) described the first and second power in submodule to be pressed partly to lead when the DC line connecting with device operates normally
Body switching device is in an off state, and the switching closes the switch；When DC line over-voltage, the method includes walking as follows
It is rapid:
Step 1: setting voltage control target upper limit value and lower limit value calculate the pressure energy consumption unit for needing to be bypassed
Quantity is calculated as the first quantity；
Step 2: choosing the pressure energy consumption unit of the first quantity, open in selected pressure energy consumption unit and press submodule
Second power semiconductor switch；
Step 3: the nonlinear resistance end voltage for the pressure energy consumption unit for opening other not increases；
Step 4: after the end voltage for the pressure energy consumption unit that do not open reaches the movement threshold of nonlinear resistance, starting to absorb
Energy on DC line, AC line voltage decline；
Step 5: if line voltage distribution is still higher than voltage control target upper limit value, continuing the pressure energy consumption for opening the second quantity
Unit；If line voltage distribution controls target lower limit value lower than voltage, the third quantity opened is pressed to energy consumption unit shutdown.
Wherein: first quantity is greater than the second quantity, and the third quantity is less than or equal to the first quantity.
Wherein: the pressure energy consumption unit on-fixed of first, second and third quantity chosen is chosen, can be average according to energy
The principle of consumption, constantly target is chosen in switching under the premise of quantity is constant.
While executing step 2, switching switch can be separated, bypass resistance is connected in series in device, participate in consumption energy, together
When play the role of limit electric current.
Beneficial effects of the present invention:
1, DC chopped-wave device proposed by the present invention is connected in parallel between the positive and negative electrode of middle high-pressure DC line, when being connected
DC line when over-voltage occurs, by putting into the control exited to pressure energy consumption unit, adjustment is connected in parallel on equal between route
The quantity of pressure energy consumption unit changes each pressure energy consumption unit both end voltage, and each pressure energy consumption unit is in parallel non-linear
Resistance, when requiring the expenditure of energy, the quantity by the pressure energy consumption unit for reducing investment is that nonlinear resistance can be improved to bear
Voltage, when reaching nonlinear resistance movement threshold value, electric current increases, and nonlinear resistance absorbs energy, meanwhile, nonlinear resistance rises
Arrived the effect of voltage clamping, it is ensured that pressure energy consumption unit will not over-voltage breakdown, this method is simple, risk is small, high reliablity.
2, nonlinear resistance is preferably utilized when bearing voltage value difference in the present invention, the change dramatically of equivalent resistance,
The difference on electric current is formd, so that it can be connected in parallel on DC line, under rated voltage, the electric current flowed through is minimum, and with
Voltage be more than operation voltage threshold, resistance value strongly reduces, and keeps the control of energy consumption more flexible, it is thus only necessary to control the equal of investment
Voltage control can be realized in the quantity of pressure energy consumption unit.And by resistance energy consumption in the way of due to resistance value be it is fixed, resistance value
Size directly affects the effect of energy consumption, once being mainly reflected in, resistance value selection is too small, and the electric current for flowing through resistance is excessive, increases resistance
Cost and volume, if resistance value choose it is excessive, the electric current for flowing through resistance is too small, make energy consumption slow.
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 present invention transfer branch uses modular mode, is readily produced manufacture.Press submodule
Block parallel connection by-pass switch can rapidly bypass malfunctioning module in module failure, can stay in submodule configuration quantity
There is certain allowance, greatly improves the operational reliability of device.
5, the bypass resistance unit in the present invention both can limit charging current when device starts, meanwhile, disappear in device
When energy consumption, energy consumption circuit can be sealed in, as the supplement of nonlinear resistance energy consumption mode, can be selected according to the size of energy consumption electric current
The quantity of 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 accordingly reduced,
Part energy is shared for nonlinear resistance；The application of nonlinear resistance and linear resistance has been implemented in combination with optimal energy consumption and has imitated
Fruit.
Detailed description of the invention
Fig. 1 is the topology diagram of DC chopped-wave device of the present invention.
Fig. 2 is the first embodiment for pressing submodule of the invention, and a and b are two kinds of connection types.
Fig. 3 is the second embodiment for pressing submodule of the invention.
Fig. 4 is the 3rd embodiment for pressing submodule of the invention.
Fig. 5 is the fourth embodiment for pressing submodule of the invention, 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 invention.
Fig. 7 is a kind of bypass mode schematic diagram for pressing submodule of the invention.
Fig. 8 is the first energy consumption mode of the embodiment of the present invention.
Fig. 9 is the second energy consumption mode of the embodiment of the present invention.
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 present invention will be further explained below with reference to the attached drawings.
As shown in Figure 1, DC chopped-wave device 1 of the present invention presses the energy consumption equidirectional series connection structure of unit 2 by least two
At 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；It is described
The anode of 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 is single
By pressing branch and nonlinear resistance 4 to be connected in parallel and constitute, the pressure branch routes at least one and presses submodule 3 and energy consumption member
Resistance 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 that a kind of charge mode schematic diagram for pressing submodule of the invention leads to when the shutdown of the down tube of half-bridge module
Current loop as shown in FIG. 6 is crossed, is submodule capacitor charging, since capacitance parameter is consistent, multiple pressure submodules pass through electricity
Hold the effect pressed.
Fig. 7 is that a kind of bypass mode schematic diagram for pressing submodule of the invention presses submodule when needing to bypass
Down tube conducting, entirely pressure submodule is bypassed by down tube, since there are anti-paralleled diodes for upper tube, under keeping during bypass
Manage in an off state, the voltage of capacitor is maintained, without will form short circuit.
The invention also includes a kind of control methods of DC chopped-wave device:
(1) when starting with device, described method includes following steps:
Step 1: the power semiconductor switch shutdown pressed in submodule, the switching switch separate, partition
Switch separates；
Step 2: after DC line electrification, being closed cutoff switch, pass through direct current of the bypass resistance into pressure submodule
Capacity charge；
Step 3: after the completion of to be charged, closure switching switch bypasses bypass resistance.
(2) described the first and second power in submodule to be pressed partly to lead when the DC line connecting with device operates normally
Body switching device is in an off state, and the switching closes the switch；When DC line over-voltage, the method includes walking as follows
It is rapid:
Step 1: setting voltage control target upper limit value and lower limit value calculate the pressure energy consumption unit for needing to be bypassed
Quantity is calculated as the first quantity；
Step 2: choosing the pressure energy consumption unit of the first quantity, open in selected pressure energy consumption unit and press submodule
Second power semiconductor switch；
Step 3: the nonlinear resistance end voltage for the pressure energy consumption unit for opening other not increases；
Step 4: after the end voltage for the pressure energy consumption unit that do not open reaches the movement threshold of nonlinear resistance, starting to absorb
Energy on DC line, AC line voltage decline；
Step 5: if line voltage distribution is still higher than voltage control target upper limit value, continuing the pressure energy consumption for opening the second quantity
Unit；If line voltage distribution controls target lower limit value lower than voltage, the third quantity opened is pressed to energy consumption unit shutdown；
While executing step 2, switching switch can be separated, bypass resistance is connected in series in device, participate in consumption energy, together
When play the role of limit electric current.
Illustrate composition and control method of the invention 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.
The above examples are only used to illustrate the technical scheme of the present invention rather than its limitations, carries out referring to above-described embodiment
Various forms is modified or is changed within the scope of the present invention.
Claims (12)
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 and energy consumption resistor be connected in series constitute, it is described pressure submodule by least one power semiconductor switch with
Capacitor is constituted.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
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
By-pass switch.
8. 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.
9. a kind of control method based on DC chopped-wave device described in claim 1-8, it is characterised in that: start when with device
When, described method includes following steps:
Step 1: the power semiconductor switch shutdown pressed in submodule, the switching switch separate, cutoff switch
It separates；
Step 2: after DC line electrification, being closed cutoff switch, filled by DC capacitor of the energy consumption resistor into pressure submodule
Electricity；
Step 3: after the completion of to be charged, electric current flows through the nonlinear resistance of pressure energy consumption unit, and each pressure energy consumption unit is born
Voltage is impartial.
10. one kind is based on claim 1-2, the control method of DC chopped-wave device described in 6-8, it is characterised in that: when with device
It is described the first and second power semiconductor switch in submodule to be pressed to be off when the DC line of connection operates normally
State, the switching close the switch；When DC line over-voltage, described method includes following steps:
Step 1: setting voltage control target upper limit value and lower limit value calculate the quantity for the pressure energy consumption unit for needing to be bypassed
It is calculated as the first quantity；
Step 2: choosing the pressure energy consumption unit of the first quantity, open in selected pressure energy consumption unit and press the second of submodule
Power semiconductor switch；
Step 3: the nonlinear resistance end voltage for the pressure energy consumption unit for opening other not increases；
Step 4: after the end voltage for the pressure energy consumption unit that do not open reaches the movement threshold of nonlinear resistance, starting to absorb direct current
Energy on route, AC line voltage decline；
Step 5: if line voltage distribution is still higher than voltage control target upper limit value, the pressure energy consumption for continuing to open the second quantity is single
Member；If line voltage distribution controls target lower limit value lower than voltage, the third quantity opened is pressed to energy consumption unit shutdown.
11. a kind of control method based on DC chopped-wave device described in claim 10, it is characterised in that: first quantity is big
In the second quantity, the third quantity is less than or equal to the first quantity.
12. a kind of control method based on DC chopped-wave device described in claim 10, it is characterised in that: chosen
One, the pressure energy consumption unit on-fixed of two, three quantity is chosen, can be according to the principle of energy mean consumption, before quantity is constant
It puts constantly switching and chooses target.
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| CN109950890A (en) * | 2019-03-25 | 2019-06-28 | 华中科技大学 | A kind of full-control type energy-consuming device |
| CN110071518A (en) * | 2019-03-29 | 2019-07-30 | 清华大学 | A kind of combined type direct-current unloading circuit based on arrester |
| CN110233488A (en) * | 2019-04-16 | 2019-09-13 | 清华大学 | A kind of more level concentration discharging circuits of unidirectional full-bridge modulesization |
| WO2021043100A1 (en) * | 2019-09-03 | 2021-03-11 | 南京南瑞继保工程技术有限公司 | Distributed direct current energy consumption device, control method therefor, and control module thereof |
| CN112825451A (en) * | 2019-11-18 | 2021-05-21 | 南京南瑞继保电气有限公司 | Energy balance adjustment converter chain, control method, multi-section converter chain and converter |
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| CN112825451B (en) * | 2019-11-18 | 2022-04-19 | 南京南瑞继保电气有限公司 | Energy balance adjustment converter chain, control method, multi-section converter chain and converter |
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