CN208369224U - Bidirectional, dc transmission system is pressed in one kind - Google Patents
Bidirectional, dc transmission system is pressed in one kind Download PDFInfo
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- CN208369224U CN208369224U CN201821138666.3U CN201821138666U CN208369224U CN 208369224 U CN208369224 U CN 208369224U CN 201821138666 U CN201821138666 U CN 201821138666U CN 208369224 U CN208369224 U CN 208369224U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
Bidirectional, dc transmission system is pressed in one kind, including inverter I, inverter II, controller I, controller II, disconnecting switch and direct current connecting line, it is characterized in that the inverter I is connect by disconnecting switch with AC network, the inverter II is connected by the AC network of disconnecting switch and the other side, inverter I is connected by direct current connecting line with inverter II, the controller I is electrically connected with inverter I, and the controller II is electrically connected with inverter II；All inverter units use identical two level or three-level three-phase structure, and inverter unit can be replaced mutually, and maintenance is simple；Inverter has independent controller, controller carries out power regulation according to instruction current, realizes the mutual transmission of two power station electric energy according to the voltage and current of Converter DC-side and the voltage and current situation computations electric current of AC network, inverter unit, control strategy is simple, practical.
Description
Technical field
The utility model relates to bidirectional, dc transmission system is pressed in a kind of electrical equipment technical field more particularly to one kind.
Background technique
With the development of power electronics technology, higher and higher, the traditional DC transmission system of requirement of the people to power grid
(LCC-HVDC) a large amount of due to needing to consume in its operational process although converter station technology has mature engineer application experience
Reactive power, and the shortcomings that there are commutation failures, be increasingly unsatisfactory for requirement of the modern power network to flexible transmission.In recent years
Come, with the development of flexible transmission technology, voltage source converter D.C. high voltage transmission (VSC-HVDC) because its switching frequency is low,
The advantages that small is lost, is widely used in flexible HVDC transmission system.
The Chinese utility model patent of application number 201310276517.9 gives a kind of based on the modular multilevel change of current
The three-pole direct current power transmission topological structure of device, the structure based on modularization multi-level converter, solve LCC-HVDC
The problem of side commutation failure is exchanged under fault in ac transmission system, but do not have the locking function of dc-side short-circuit electric current.Application number
201510920911.0 Chinese utility model patent give a kind of flexible HVDC transmission system topological structure, which uses
The sub-module cascade of two kinds of different structures can effectively reduce fault current when dc-side short-circuit occurs, effective to protect
Power electronic devices has been protected, but has been cascaded using two seed modules, has not only increased the maintenance difficulties of system, and increase control
Difficulty.
Summary of the invention
To solve the above-mentioned problems, the utility model provides pressure bidirectional, dc transmission system in one kind, provides a kind of dimension
Bidirectional, dc transmission system is pressed during shield is convenient, control is simple.To achieve the above object, the technical solution that the utility model is taken
Are as follows: one kind in press bidirectional, dc transmission system, including inverter I, inverter II, controller I, controller II, disconnecting switch and
Direct current connecting line, the inverter I are connect by disconnecting switch with AC network, and the inverter II passes through disconnecting switch
Connect with the AC network of the other side, inverter I is connected by direct current connecting line with inverter II, the controller I and
Inverter I is electrically connected, and the controller II is electrically connected with inverter II.
Further, controller I obtains the voltage value signal of I DC side of inverter, current value signals and AC network
Voltage signal, ac-side current signal.
Further, controller II obtains voltage value signal, current value signals and the AC network of II DC side of inverter
Voltage signal, ac-side current signal.
Further, it does not need to communicate between controller I and controller II.
Further, inverter I include the grid-connected transformer of preset quantity, the inverter unit of preset quantity, reactor,
The grid-connected transformer of resistance and conducting wire, preset quantity is linked together by way of in parallel, the inverter unit of preset quantity
DC terminal linked together by concatenated mode, grid-connected transformer is connected with the end that exchanges of inverter unit, head and the tail
The DC terminal of inverter unit is connected with D.C. contactor I, D.C. contactor II respectively by reactor, and the resistance is set
It sets between intermediate two inverter unit DC terminals, resistance is connected by conducting wire with the earth.
Further, inverter II and inverter I are set as identical circuit topological structure.
Further, grid-connected transformer includes primary connection and secondary connection, and the primary connection is by preset quantity
Winding parallel is constituted, and the secondary connection is constituted by the winding of preset quantity is mutually isolated, and the primary connection passes through disconnected
Road device is connected with AC network, and the secondary connection is connected with the end that exchanges of inverter unit.
Further, resistance is dimensioned to mega-ohms.
Further, inverter unit circuit topology is set as two level three-phase bridge structures or three-level three-phase bridge structure.
PWM rectification had both may be implemented in inverter unit, PWM inversion also may be implemented, bi-directional may be implemented in energy.
Further, inverter unit reduces exchange side output off current HIGH frequency ripple by way of phase-shifting carrier wave.
Further, inverter I is different with the control strategy of inverter II, and one of control strategy presses off for direct current
The given control of ring+reactive power, another control strategy be active power it is given+reactive power is given, pass through above-mentioned control
Active transmitting may be implemented in strategy and the function of reactive compensation is unified.
Further, the active power can be positive and be also possible to negative power, i.e., energy transmission mode is double
To.
Further, inverter unit have the function of after auto by pass, inverter unit break down can auto by pass, protect
Demonstrate,prove whole system stable operation.
Compared with prior art, the utility model has the following beneficial effects: all inverter units use identical two
Level or three-level three-phase structure, inverter unit can be replaced mutually, and maintenance is simple；Inverter has independent controller, control
Device processed is according to the voltage and current of Converter DC-side and the voltage and current situation computations electric current of AC network, inverter unit
Power regulation is carried out according to instruction current, realizes the mutual transmission of two power station electric energy, control strategy is simple, practical.
Detailed description of the invention
The utility model is described in further detail below in conjunction with attached drawing.
Attached drawing 1 is the structural schematic diagram of the utility model；
Attached drawing 2 is a kind of circuit topological structure schematic diagram of inverter unit；
In attached drawing: 1, inverter I, 2, inverter II, 3, controller I, 4, controller II, 5, D.C. contactor I, 6, direct current
Contactor II, 7, breaker, 8, grid-connected transformer, 9, inverter unit, 10, reactor, 11, resistance.
Specific embodiment
In order to enable those skilled in the art to better understand the technical solutions of the present invention, 1, attached drawing with reference to the accompanying drawing
2 and specific embodiment the utility model is further described.
Such as attached drawing 1, bidirectional, dc transmission system, including inverter I 1, inverter II 2, controller I 3, control are pressed in one kind
Device II 4, D.C. contactor I 5, D.C. contactor II 6 and breaker 7, the inverter I 1 pass through breaker 7 and 3.3kV tri-
The connection of phase AC network, the inverter II 2 are connect by breaker 7 with the 3.3kV three-phase AC grid of the other side, the change of current
The positive bus-bar of device I 1 is connected by D.C. contactor I 5 with the positive bus-bar of inverter II 2, and the negative busbar of inverter I 1 passes through direct current
Contactor II 6 is connected with the negative busbar of inverter II 2, and the controller I 3 is electrically connected with inverter I 1, the controller
II 4 are electrically connected with inverter II 2.When inverter I 1 breaks down, it is disconnected that controller I 1 controls breaker 7, D.C. contactor I 5
It opens, to disconnect the connection of inverter I 1 Yu AC network and DC line；When inverter II 2 breaks down, controller II 4
Breaker 7, the disconnection of D.C. contactor II 6 are controlled, to disconnect the connection of inverter II 2 Yu AC network and DC line.
Further, controller I 3 includes main controller, signal regulating panel, communication board, power panel, current transformer, direct current
Voltage sensor and current sensor, the current transformer, direct current voltage sensor, current sensor respectively with signal tune
Plate electrical connection is managed, the signal regulating panel includes conditioning circuit, and the conditioning circuit includes difference channel, signal regulating panel
It is electrically connected with main controller, signal regulating panel is described for acquiring current and voltage signals and signal conversion being sent to main controller
Power panel is electrically connected with main controller, and power panel is used to provide electric energy to main controller and support, the communication board is electrically connected with main controller
It connects, communication board is communicated for main controller with inverter I 1, and main controller is calculated according to the current and voltage signals that signal regulating panel acquires
Active power and reactive power, and the regulating command of active power and reactive power is sent to inverter I 1 by communication board,
And then it controls inverter I 1 and exports；Conditioning plate acquires the voltage and current signal of AC network by current transformer, difference channel,
The voltage and current signal of I 1 DC side of inverter is acquired by direct current voltage sensor, current sensor, wherein the electricity of DC side
Pressure signal can also communicate reading with inverter I 1 by main controller.
Further, controller II 4 is set as structure identical with controller I 3, and controller II 4 includes main controller, signal
Conditioning plate, communication board, power panel, current transformer, direct current voltage sensor and current sensor, the current transformer,
Direct current voltage sensor, current sensor are electrically connected respectively at signal regulating panel, and the signal regulating panel includes conditioning circuit,
The conditioning circuit includes difference channel, and signal regulating panel is electrically connected with main controller, and signal regulating panel is for acquiring electric current electricity
Signal conversion is simultaneously sent to main controller by pressure signal, and the power panel is electrically connected with main controller, and power panel is used for main controller
It provides electric energy to support, the communication board is electrically connected with main controller, and communication board is communicated for main controller with inverter II 2, master control
The current and voltage signals that device is acquired according to signal regulating panel calculate active power and reactive power, and by active power and idle function
The regulating command of rate is sent to inverter II 2 by communication board, and then controls inverter II 2 and export；Conditioning plate is mutual by electric current
The voltage and current signal of sensor, difference channel acquisition AC network acquires the change of current by direct current voltage sensor, current sensor
The voltage and current signal of II 2 DC side of device, wherein the voltage signal of DC side can also be communicated by main controller with inverter II 2
It reads.
Further, it does not need to communicate between controller I 3 and controller II 4.
Further, inverter I 1 includes 2 grid-connected transformers, 8,12 inverter units 9, reactor 10,11 and of resistance
Conducting wire, the group of the grid-connected transformer 8 are set as Yd11, grid-connected transformer 8 include 6 armature windings and 6 secondary around
Group, 12 secondary windings are connected with the three-phase input end of 12 inverter units 9 respectively, the 1st inverter unit 9 and last
The DC terminal of one inverter unit 9 is connected with D.C. contactor I 5, D.C. contactor II 6 respectively by reactor 10, institute
The DC terminal for stating 12 inverter units 9 is linked together by concatenated mode, what 9 DC terminal of inverter unit was connected in series
The final DC terminal total voltage of inverter I 1 can be improved in mode, and the setting of resistance 11 is straight in intermediate two inverter units 9
It flows between end, resistance 11 is connected by conducting wire with the earth, and the pressure difference of inverter unit 9 and the earth is reduced.
Further, inverter II 2 includes 2 grid-connected transformers 8,12 inverter units 9, reactor 10, resistance 11
And conducting wire, the group of the grid-connected transformer 8 are set as Yd11, grid-connected transformer 8 includes 6 armature windings and 6 secondary
Winding, 12 secondary windings are connected respectively at the three-phase input end of 12 inverter units 9, the 1st inverter unit 9 and most
The DC terminal of the latter inverter unit 9 is connected with D.C. contactor I 5, D.C. contactor II 6 respectively by reactor 10,
The DC terminal of 12 inverter units 9 is linked together by concatenated mode, and 9 DC terminal of inverter unit is connected in series
Mode can be improved the final DC terminal total voltage of inverter II, the setting of resistance 11 is in intermediate two inverter units 9
Between DC terminal, resistance 11 is connected by conducting wire with the earth, reduces the pressure difference of inverter unit 9 and the earth.
Further, the resistance value of resistance 11 is set as 1M Ω.
Further, the inductance value of reactor 10 is set as 1mH.
Further, as shown in Fig. 2, inverter unit 9 is set as three-level three-phase bridge structure, including bridge arm I, bridge arm
II, bridge arm III, capacitor C1, capacitor C2, resistance R1, resistance R2 and peripheral circuit, the bridge arm I include IGBTQ11,
IGBTQ12, IGBTQ13, IGBTQ14, diode D11 and diode D12, IGBTQ11, IGBTQ12, IGBTQ13, IGBTQ14
It is linked together by concatenated mode, the tie point of concatenated diode D11, diode D12 and IGBTQ11 and IGBTQ12,
The tie point of IGBTQ13 and IGBTQ14 links together, bridge arm II include IGBTQ21, IGBTQ22, IGBTQ23, IGBTQ24,
Diode D21 and diode D22, IGBTQ21, IGBTQ22, IGBTQ23, IGBTQ24 are connected to one by concatenated mode
It rises, the connection of the tie point, IGBTQ23 and IGBTQ24 of concatenated diode D21, diode D22 and IGBTQ21 and IGBTQ22
Point links together, and bridge arm III includes IGBTQ31, IGBTQ32, IGBTQ33, IGBTQ34, diode D31 and diode D32,
IGBTQ31, IGBTQ32, IGBTQ33, IGBTQ34 are linked together by concatenated mode, concatenated diode D31, two poles
The tie point of the tie point of pipe D32 and IGBTQ31 and IGBTQ32, IGBTQ33 and IGBTQ34 links together, IGBTQ12 and
The tie point of IGBTQ13 is connected with the A phase of grid-connected transformer secondary output winding, the tie point of IGBTQ22 and IGBTQ23 with it is grid-connected
The B phase of transformer secondary output winding is connected, the C phase phase of the tie point of IGBTQ32 and IGBTQ33 and grid-connected transformer secondary output winding
Connection, the capacitor C1, capacitor C2 series connection after be connected with the both ends of bridge arm III, the resistance R1, resistance R2 series connection after with electricity
Hold C1 and capacitor C2 to be connected in parallel, resistance R1, resistance R2 are used for capacitor C1, the both ends capacitor C2 static state voltage equipoise, diode D11 and two
The tie point of pole pipe D12, the tie point of diode D21 and diode D22, diode D31 and diode D32 tie point, electricity
The tie point for holding C1 and capacitor C2 is linked together by peripheral circuit.
A kind of control method of middle pressure bidirectional, dc transmission system, comprising the following steps:
(i) controller I 3 acquires the voltage and current signal of AC network by current transformer, difference channel, passes through direct current
Voltage sensor, current sensor acquisition direct current survey voltage and current signal；Controller II 4 passes through current transformer, difference channel
The voltage and current signal for acquiring other side AC network acquires direct current by direct current voltage sensor, current sensor and surveys voltage
Current signal;
(ii) controller I 3 is given as control algolithm with DC voltage closed loop and reactive power, and controller II 4 is with wattful power
Rate is given and reactive power is given as control algolithm, and the two can be interchanged, i.e., controller I 3 is given and idle function with active power
Rate is given as control algolithm, and controller II 4 is given as control algolithm, controller I 3 and control with DC voltage closed loop and reactive power
It does not need to communicate between device II 4 processed;
The instruction of (iii) reactive power and active power instruction are to be respectively issued to inverter list by controller I 3, controller II 4
Member 9, inverter unit 9 reduce exchange side output off current HIGH frequency ripple by way of phase-shifting carrier wave;
(iv) controller I 3 and controller II 4 can receive and dispatch given reactive power, then carry out Reactive-power control;
(v) control algolithm is given as with DC voltage closed loop and reactive power when controller I 3, controller II 4 is with wattful power
When rate is given and reactive power is given as control algolithm, controller II 4 receives given active power, determines the tune of active power
Save direction.If it is towards I 1 side of inverter, inverter I 1 and inverter that controller II 4, which receives given active power direction,
DC bus-bar voltage between II 2 increases, and controller I 3 passes through the operation of DC voltage closed loop, and inverter II 2 is passed over
Active power be transported on the AC network of I 1 side of inverter；If controller II 4 receives given watt current direction
Towards II 2 side of inverter, then the DC bus-bar voltage between inverter I 1 and inverter II 2 reduces, and controller I 3 passes through straight
The operation for flowing voltage close loop absorbs active power from I 1 side of inverter
Compared with prior art, the utility model has the following beneficial effects: all inverter units use identical two
Level or three-level three-phase structure, inverter unit can be replaced mutually, and maintenance is simple；Inverter has independent controller, control
Device processed is according to the voltage and current of Converter DC-side and the voltage and current situation computations electric current of AC network, inverter unit
Power regulation is carried out according to instruction current, realizes the mutual transmission of two power station electric energy, control strategy is simple, practical.
Using technical solution described in the utility model or those skilled in the art in technical solutions of the utility model
Under inspiration, similar technical solution is designed, and reaches above-mentioned technical effect, is the protection model for falling into the utility model
It encloses.
Claims (8)
1. pressing bidirectional, dc transmission system, including inverter I (1), inverter II (2), controller I (3), controller II in one kind
(4), D.C. contactor I (5), D.C. contactor II (6) and breaker (7), it is characterized in that the inverter I (1) is by breaking
Road device (7) is connect with three-phase AC grid, and the inverter II (2) passes through the three-phase alternating current of breaker (7) and the other side
The positive bus-bar of net connection, inverter I (1) is connected by D.C. contactor I (5) with the positive bus-bar of inverter II (2), inverter I
(1) negative busbar is connected by D.C. contactor II (6) with the negative busbar of inverter II (2), the controller I (3) with change
Device I (1) electrical connection is flowed, the controller II (4) is electrically connected with inverter II (2).
2. DC transmission system according to claim 1, it is characterized in that controller I (3) includes main controller, signal condition
Plate, communication board, power panel, current transformer, direct current voltage sensor and current sensor, the current transformer, direct current
Voltage sensor, current sensor are electrically connected with signal regulating panel respectively, and the signal regulating panel includes conditioning circuit, described
Conditioning circuit include difference channel, the signal regulating panel for playing signal acquisition, the power panel for playing electric energy supporting function, rise it is logical
The communication board of letter effect is electrically connected with main controller respectively.
3. DC transmission system according to claim 1, it is characterized in that controller II (4) is set as and controller I (3) phase
Same structure.
4. DC transmission system according to claim 1, it is characterized in that inverter I (1) includes the grid-connected change of preset quantity
Depressor (8), the inverter unit (9) of preset quantity, reactor (10), resistance (11) and conducting wire, the grid-connected transformation of preset quantity
Device (8) is linked together by way of in parallel, and the DC terminal of the inverter unit (9) of preset quantity is connected by concatenated mode
It is connected together, grid-connected transformer (8) is connected with the end that exchanges of inverter unit (9), the direct current of the inverter unit (9) of head and the tail
End is connected with D.C. contactor I (5), D.C. contactor II (6) respectively by reactor (10), the resistance (11) setting
Between intermediate two inverter unit (9) DC terminals, resistance (11) is connected by conducting wire with the earth.
5. DC transmission system according to claim 1, it is characterized in that inverter II (2) is set as and inverter I (1) phase
Same structure.
6. DC transmission system according to claim 4, it is characterized in that grid-connected transformer (8) includes primary connection and secondary
Connection, the primary connection are made of the winding parallel of preset quantity, the secondary winding phase connected by preset quantity
Mutually isolation is constituted, and the primary connection is connected by breaker with AC network, the secondary connection and inverter list
The exchange end of first (9) is connected.
7. DC transmission system according to claim 4, it is characterized in that the resistance value of resistance (11) is set as mega-ohms.
8. DC transmission system according to claim 4, it is characterized in that inverter unit (9) circuit topology is set as two electricity
Flat three-phase bridge structure or three-level three-phase bridge structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821138666.3U CN208369224U (en) | 2018-07-18 | 2018-07-18 | Bidirectional, dc transmission system is pressed in one kind |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821138666.3U CN208369224U (en) | 2018-07-18 | 2018-07-18 | Bidirectional, dc transmission system is pressed in one kind |
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| CN208369224U true CN208369224U (en) | 2019-01-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108736505A (en) * | 2018-07-18 | 2018-11-02 | 新风光电子科技股份有限公司 | Bidirectional, dc transmission system and its control method are pressed in one kind |
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2018
- 2018-07-18 CN CN201821138666.3U patent/CN208369224U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108736505A (en) * | 2018-07-18 | 2018-11-02 | 新风光电子科技股份有限公司 | Bidirectional, dc transmission system and its control method are pressed in one kind |
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