CN107769240B - The control method and device of direct current change-over switch - Google Patents
The control method and device of direct current change-over switch Download PDFInfo
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- CN107769240B CN107769240B CN201711025837.1A CN201711025837A CN107769240B CN 107769240 B CN107769240 B CN 107769240B CN 201711025837 A CN201711025837 A CN 201711025837A CN 107769240 B CN107769240 B CN 107769240B
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- over switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
The present invention relates to the control method and device of direct current change-over switch.The described method includes: three end direct current systems of control enter the state from state shift the second loop line access of the first loop line access；Control the first loop line change-over switch closure of the first inverter side；It sends first to other instruction change-over switches of inverter side simultaneously to forbid instructing, to prevent these direct current change-over switch malfunctions；The feedback signal for closing the switch completion is received, the second loop line change-over switch of the first inverter side of control disconnects；It receives switch and disconnects the feedback signal completed, the first loop line change-over switch closure of the second inverter side of control；The feedback signal for closing the switch completion is received, the second loop line change-over switch of the second inverter side of control disconnects.Described device is device corresponding with the above method.The case where electric current that inverter side one end can occur to avoid three end direct current systems in conversion operation mode in the present invention is filled to the other end, and then guarantee to run with security and stability in conversion operation mode Shi Sanduan direct current system.
Description
Technical field
The present invention relates to technical field of direct current power transmission, more particularly to the control method and dress of a kind of direct current change-over switch
It sets.
Background technique
Traditional both ends direct current system, one end are rectification side, and the other end is inverter side, and (the earth returns direct current change-over switch
Line change-over switch, Earth Return Transfer Breaker, ERTB and metallic return change-over switch, Metallic
Return Transfer Breaker, MRTB) certain one end for being installed therein, when being operated to direct current change-over switch, operation
Sequence is simple.But it is more complicated for the operation of the direct current change-over switch of three end direct current systems.The inverter side of three end direct current systems
Two DC terminals have been accessed, for the conversion for completing system operation mode, need to install direct current change-over switch at the both ends of inverter side,
Relative to two-terminal direct current transmission system, direct current change-over switch quantity increases, and the operation of direct current change-over switch also becomes more sophisticated,
However existing direct current change-over switch control method, existing causes converter station to have high current to flow into interior grounded screen of standing through ground return circuit
Risk, to converter station run generate adverse effect, or even influence personal safety.
Summary of the invention
Based on this, the present invention provides the control method and device of direct current change-over switch, it can guarantee and converting three end direct currents
The method of operation Shi Sanduan direct current system of system is run with security and stability.
The embodiment of the present invention includes:
A kind of control method of direct current change-over switch, comprising:
The signal of three end direct current systems of conversion is received, Xiang Sanduan direct current system sends control enable signal, control described three
Direct current system is held to enter the state from state shift the second loop line access of the first loop line access；Wherein, the three ends direct current system
System includes the first inverter side and the second inverter side, and the first inverter side, the second inverter side include the first loop line and the second loop line；
In the state that three end direct current systems enter from state shift the second loop line access of the first loop line access, to first
First loop line change-over switch of inverter side sends the first close command, is opened with controlling the first loop line conversion of first inverter side
It closes and closes；Simultaneously to the second loop line change-over switch of the first inverter side, the first loop line change-over switch of the second inverter side, second time
Line change-over switch, which sends first, to be forbidden instructing, to prevent the second loop line change-over switch, the second inverter side of first inverter side
The first loop line change-over switch and the second loop line change-over switch malfunction；
The feedback signal that the first loop line change-over switch closure of the first inverter side is completed is received, the first inverter side of Xiang Suoshu
Second loop line change-over switch sends the first open command, is disconnected with controlling the second loop line change-over switch of first inverter side；
The the second loop line change-over switch for receiving the first inverter side disconnects the feedback signal completed, the second inverter side of Xiang Suoshu
First loop line change-over switch sends the second close command, to control the first loop line change-over switch closure of second inverter side；
The feedback signal that the first loop line change-over switch closure of the second inverter side is completed is received, the second inverter side of Xiang Suoshu
Second loop line change-over switch sends the second open command, is disconnected with controlling the second loop line change-over switch of second inverter side.
A kind of control device of direct current change-over switch, comprising:
Signal receiving module is controlled, for receiving the signal of three end direct current systems of conversion, Xiang Sanduan direct current system sends control
Enable signal processed, control three end direct current system enter the shape from state shift the second loop line access of the first loop line access
State；Wherein, three end direct current system includes the first inverter side and the second inverter side, and the first inverter side, the second inverter side are wrapped
Containing the first loop line and the second loop line；
First switch control module is returned for entering in three end direct current systems from the state shift second of the first loop line access
In the state of line access, the first close command is sent to the first loop line change-over switch of the first inverter side, to control described first
First loop line change-over switch of inverter side is closed；Simultaneously to the second loop line change-over switch of the first inverter side, the second inverter side
First loop line change-over switch, the second loop line change-over switch, which send first, to be forbidden instructing, to prevent the second of first inverter side
Loop line change-over switch, the first loop line change-over switch of the second inverter side and the second loop line change-over switch malfunction；
Second switch control module, the first loop line change-over switch for receiving the first inverter side are closed the feedback letter completed
Number, the second loop line change-over switch of the first inverter side of Xiang Suoshu sends the first open command, to control first inverter side
Second loop line change-over switch disconnects；
Third switch control module, the second loop line change-over switch for receiving the first inverter side disconnect the feedback letter completed
Number, the first loop line change-over switch of the second inverter side of Xiang Suoshu sends the second close command, to control second inverter side
First loop line change-over switch closure；
And the 4th switch control module, the first loop line change-over switch for receiving the second inverter side, which is closed, to be completed
Feedback signal, the second loop line change-over switch of the second inverter side of Xiang Suoshu sends the second open command, inverse to control described second
The the second loop line change-over switch for becoming side disconnects.
A kind of computer readable storage medium, is stored thereon with computer program, realization when which is executed by processor
The step of method described above.
A kind of computer equipment can be run on a memory and on a processor including memory, processor and storage
The step of computer program, the processor realizes method described above when executing described program.
Above-mentioned technical proposal, when three end direct current systems needs turn to metallic return mode from Ground return mode, control
System receives the signal of three end direct current systems of conversion, and Xiang Sanduan direct current system sends control enable signal, it is straight to control three end
Streaming system enters the state from the state shift metallic return access of Ground return access；It is closed the ERTB of the first inverter side, together
When send forbid instructing, to prevent ERTB, MRTB malfunction of the ERTB, the second inverter side of the first inverter side；Determining the first inversion
The MRTB for disconnecting the first inverter side is controlled again after the ERTB closure of side；It is controlled again after the MRTB for determining the first inverter side is disconnected
The ERTB of system the second inverter side of closure；Finally control disconnects the second inverter side after the ERTB closure for determining the second inverter side
MRTB.This operating method effectively prevents the case where side d electric current flows backward the side x appearance.When three end direct current systems are needed from metal
When loop mode turns to Ground return mode, method of controlling switch is corresponding with the above method.According to turning for above-mentioned technical proposal
It changes switching operation three end direct current systems are opened or closed, the electric current that can avoid the occurrence of inverter side one end is filled to another
The case where one end, and then guarantee to transport with security and stability in the method for operation Shi Sanduan direct current system for converting three end direct current systems
Row.
Detailed description of the invention
Fig. 1 is the schematic flow chart of the control method of direct current change-over switch in an embodiment；
Fig. 2 is the schematic diagram of three end direct current systems in an embodiment；
Fig. 3 is the equivalent circuit diagram of the direct current change-over switch of both ends direct current system in an embodiment；
Fig. 4 is the equivalent circuit diagram of the direct current change-over switch of three end direct current systems in an embodiment；
Fig. 5 is that three the second inverter sides of end direct current system are in metallic return access, the first inverter side is in an embodiment
Equivalent circuit diagram under Ground return and metallic return path in parallel operating condition；
Fig. 6 (a) is equivalent before three the first inverter sides of end direct current system closure Ground return change-over switch in an embodiment
Circuit diagram；
Fig. 6 (b) is equivalent after three the first inverter sides of end direct current system closure Ground return change-over switch in an embodiment
Circuit diagram；
Fig. 6 (c) is equivalent after three the first inverter sides of end direct current system disconnection metallic return change-over switch in an embodiment
Circuit diagram；
Fig. 6 (d) is equivalent after three the second inverter sides of end direct current system closure Ground return change-over switch in an embodiment
Circuit diagram；
Fig. 6 (e) is equivalent after three the second inverter sides of end direct current system disconnection metallic return change-over switch in an embodiment
Circuit diagram；
Fig. 7 is the structural schematic diagram of the control device of direct current change-over switch in an embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Although the step in the present invention is arranged with label, it is not used to limit the precedence of step, unless
Based on the execution of the order or certain step that specify step needs other steps, otherwise the relative rank of step is
It is adjustable.
The embodiment of the present invention provides a kind of control method of direct current change-over switch, the method includes the steps: receive conversion
The signal of three end direct current systems, Xiang Sanduan direct current system send control enable signal, control three end direct current system enter from
The state of state shift the second loop line access of first loop line access；Wherein, three end direct current system includes the first inverter side
With the second inverter side, the first inverter side, the second inverter side include the first loop line and the second loop line；Enter in three end direct current systems
In the state of state shift the second loop line access of the first loop line access, sent out to the first loop line change-over switch of the first inverter side
The first close command is sent, to control the first loop line change-over switch closure of first inverter side；Simultaneously to the first inverter side
Second loop line change-over switch, the first loop line change-over switch of the second inverter side, the second loop line change-over switch, which send first, to be forbidden referring to
It enables, to prevent the first loop line change-over switch and the of the second loop line change-over switch of first inverter side, the second inverter side
Two loop line change-over switch malfunctions；Receive the feedback signal that the first loop line change-over switch closure of the first inverter side is completed, Xiang Suoshu
Second loop line change-over switch of the first inverter side sends the first open command, is turned with controlling the second loop line of first inverter side
Switch is changed to disconnect；The the second loop line change-over switch for receiving the first inverter side disconnects the feedback signal completed, the second inversion of Xiang Suoshu
First loop line change-over switch of side sends the second close command, is closed with controlling the first loop line change-over switch of second inverter side
It closes；Receive the second inverter side the first loop line change-over switch closure complete feedback signal, the second of the second inverter side of Xiang Suoshu
Loop line change-over switch sends the second open command, is disconnected with controlling the second loop line change-over switch of second inverter side.This hair
Bright embodiment also provides the control device of corresponding direct current change-over switch.It is described in detail separately below.
As shown in Figure 1, the schematic flow chart of the control method for the direct current change-over switch of an embodiment.The embodiment
The control method of the direct current change-over switch of offer mainly includes step S110 to step S150, and detailed description are as follows:
S110, the signal for receiving three end direct current systems of conversion, Xiang Sanduan direct current system send control enable signal, control institute
It states three end direct current systems and enters state from state shift the second loop line access of the first loop line access；Wherein, three end is straight
Streaming system includes the first inverter side and the second inverter side, and the first inverter side, the second inverter side include the first loop line and second time
Line.
Generally for DC transmission system, every one end (each rectification side and inverter side) includes positive and negative polarities, each
Pole all passes through ground connection polar curve and is connected with the earth, and is connected between polar curve and polar curve by switch.Monopolar ground return refers to, direct current
Every end of transmission system all only has a pole to put into operation, and is formed into a loop by the earth.Monopolar metallic return refers to that direct current is defeated
Every end of electric system all only has a pole to put into operation, and (such by the switching circuitry forming circuit between polar curve and polar curve
State lower switch is in closed state).Every end ground electrode circuit of DC transmission system is usually being stood outside outer certain distance, is passed through
Special route extends and buries to big ground depths, this mode ground electrode circuit ground connection；In addition to this, every end is also needed every
In converter station where holding, in provided underground grounded screen, as the spare of ground electrode circuit ground connection, so as to ground electrode circuit failure
Or as temporary grounding when needing to overhaul.
It breaks down in DC transmission system, when needing trouble hunting, needs to turn the Ground return of DC transmission system
For metallic return, metallic return is switched into Ground return again after overhauling well.Optionally, the state from the first loop line access
The state for turning to the second loop line access refers to that the monopole the earth method of operation is converted to the monopole metal method of operation or the operation of monopole metal
Mode is converted to the monopole the earth method of operation, in other words, and from Ground return mode is converted to metallic return mode or from gold
Belong to loop mode and is converted to Ground return mode.
In the present invention, the first inverter side and the second inverter side are two inverter sides of three end direct current systems, from greatly
When loop line turns metallic return, the first inverter side is denoted as the end x, and the second inverter side is denoted as the end d；It is corresponding, turn from metallic return
When Ground return, the first inverter side is denoted as the end d, and the second inverter side is denoted as the end x.
The schematic diagram of three end direct current systems (three end DC transmission systems) is as shown in Figure 2.(both ends are straight for both ends direct current system
Flow transmission system) it include rectification side and inverter side (as shown in Figure 3), and three end direct current systems are different from both ends direct current system, such as
Shown in Fig. 2, two DC terminals, respectively the first inverter side 220 and the second inverter side 230 are accessed in inverter side, first is inverse
Becoming side 220 and the second inverter side 230 includes metallic return and Ground return.In polar curve in the converter station of first inverter side 220
It is connected with a route is drawn on neutral bus respectively with the second inverter side 230.Wherein, NBS refers to that neutral bus switchs
(Neutral Bus Switch), NBGS refer to neutral bus earthing switch (Neutral Bus Grounding Switch).
In this step, after control system receives the signal for converting three end direct current systems, Xiang Sanduan direct current system is sent
Enable signal is controlled, control three end direct current system enters the shape from state shift the second loop line access of the first loop line access
State.
S120, three end direct current systems enter from state shift the second loop line access of the first loop line access in the state of,
The first close command is sent to the first loop line change-over switch of the first inverter side, to control the first loop line of first inverter side
Change-over switch closure；Simultaneously to the second loop line change-over switch of the first inverter side, the second inverter side the first loop line change-over switch,
Second loop line change-over switch, which is sent, first to be forbidden instructing, with prevent first inverter side the second loop line change-over switch, second
First loop line change-over switch of inverter side and the second loop line change-over switch malfunction.
In the case that three end direct current systems enter transition status, starts the opening and closing for controlling direct current change-over switch, realize direct current
The conversion of the method for operation of transmission system.This step control system controls the first loop line change-over switch closure of the first inverter side；
It sends simultaneously and forbids instructing to control other direct current change-over switches of inverter side, prevent their malfunctions.
The feedback signal that S130, the first loop line change-over switch closure for receiving the first inverter side are completed, Xiang Suoshu first are inverse
The the second loop line change-over switch for becoming side sends the first open command, to control the second loop line change-over switch of first inverter side
It disconnects.
In this step, after the completion of the first loop line change-over switch closure of the first inverter side, feedback letter is sent to control system
Number, after control system receives the feedback signal, signal is sent to control the second loop line change-over switch of the first inverter side and disconnect.
S140, the second loop line change-over switch for receiving the first inverter side disconnect the feedback signal completed, and Xiang Suoshu second is inverse
The the first loop line change-over switch for becoming side sends the second close command, to control the first loop line change-over switch of second inverter side
Closure.
In this step, after the completion of the second loop line change-over switch of the first inverter side disconnects, feedback letter is sent to control system
Number, after control system receives the feedback signal, signal is sent to control the first loop line change-over switch closure of the second inverter side.
The feedback signal that S150, the first loop line change-over switch closure for receiving the second inverter side are completed, Xiang Suoshu second are inverse
The the second loop line change-over switch for becoming side sends the second open command, to control the second loop line change-over switch of second inverter side
It disconnects.
In this step, after the completion of the first loop line change-over switch closure of the second inverter side, feedback letter is sent to control system
Number, after control system receives the feedback signal, signal is sent to control the second loop line change-over switch of the second inverter side and disconnect.
The embodiment of the present invention, the sequence of the direct current change-over switch by controlling three end direct current systems being opened or closed, can
To avoid there is system because direct current change-over switch disconnects and is closed and the phenomenon that electric current of inverter side one end is filled to the other end occurs, into
And guarantee that, when converting the method for operation of three end direct current systems, three end direct current systems can be run with security and stability, guarantee person peace
Entirely.
In one embodiment, the control method of the direct current change-over switch further include: receive second time of the second inverter side
Line change-over switch disconnects the feedback signal completed, the first loop line change-over switch of the first inverter side of Xiang Suoshu and the conversion of the second loop line
Switch, the first loop line change-over switch of the second inverter side and the second loop line change-over switch send second respectively and forbid instructing, to prevent
Only the first loop line conversion of the first loop line change-over switch and the second loop line change-over switch of first inverter side, the second inverter side
Switch and the second loop line change-over switch malfunction.
The present embodiment second inverter side the second loop line change-over switch disconnect after the completion of, second inverter side
Second loop line change-over switch sends feedback signal to control system, after control system receives the feedback signal, to the first inversion
The transmission of all direct current change-over switches of side and the second inverter side is forbidden controlling signal, to prevent these change-over switch malfunctions.Pass through
The generation for the case where preventing all switch malfunctions from can effectively prevent the maloperation of switch and electric current is caused to flow backward.
In one embodiment, three end direct current system further includes rectification side；First inverter side or the second inverter side
It is connected by DC line with the rectification side, in the change of current for the first inverter side or the second inverter side being connected with the rectification side
In standing, first inverter side is connected with the second inverter side by DC line.
As shown in figure 4, Fig. 4 is the equivalent circuit diagram of the direct current change-over switch of three end direct current systems in an embodiment.Wherein,
Each DC terminal actually represents a DC converter station.It is inverse for first when the first inverter side is connected with rectification side
Become side (being represented in Fig. 4 as the end x), in addition to connecting the DC line being connected with rectification side, also to connect and be connected with the second inverter side
DC line, the first inverter side and the second inverter side are actually parallel relationship, therefore the first inverter side and the second inverter side
DC line be intersected in the converter station of the first inverter side.The present embodiment reconnects an inversion from the direct current system of both ends
Side, being formed has a rectification side, three end direct current systems of two inverter sides, can guarantee that more multicomponent is linked into DC power transmission system
In system.
In one embodiment, first loop line is Ground return, and second loop line is metallic return；Described first time
Line change-over switch is Ground return change-over switch, for controlling the DC current of three end direct current system from metallic return access
Be converted to Ground return access；The second loop line change-over switch is metallic return change-over switch, straight for controlling three end
The DC current of streaming system is converted to metallic return access from Ground return access.
In the present embodiment, the first loop line is Ground return, and the second loop line is metallic return, therefore, the first loop line access
State turns the state of the second loop line access and turns to metallic return access from Ground return access for DC current.
In one embodiment, first loop line is metallic return, and second loop line is Ground return；Described first time
Line change-over switch is metallic return change-over switch, for controlling the DC current of three end direct current system from Ground return access
Be converted to metallic return access；The second loop line change-over switch is Ground return change-over switch, straight for controlling three end
The DC current of streaming system is converted to Ground return access from metallic return access.
In the present embodiment, the first loop line is metallic return, and the second loop line is Ground return, therefore, the first loop line access
State turns the state of the second loop line access and turns to Ground return access from metallic return access for DC current.
Optionally, the conversion process of electric current is fairly simple in traditional both ends direct current change-over switch operating method.And for
Three end direct current change-over switches operation, it is necessary to be executed in strict accordance with certain conversion order.The embodiment of the present invention is converted to direct current
The improvement that cooperation between switch and control system carries out.Therefore, for the operating method of change-over switch, in addition to according to the present invention
Outside the sequence of embodiment meaning is operated, also certain restrictions and cooperation are given to switch operation.
The above method in order to better understand, the control method of a direct current change-over switch of the present invention detailed below
Application example.
Fig. 2 is three end direct current system schematic diagrames.It is different from both ends direct current system, in addition to rectification side 210, three end direct current systems
Two DC terminals, respectively the first inverter side 220 and the second inverter side 230 are also accessed in inverter side.First inverter side 220 and
Two inverter sides 230 have been respectively coupled direct current change-over switch MRTB and ERTB, in polar curve in the converter station of the first inverter side 220
It is connected with a route is drawn on neutral bus respectively with the second inverter side 230.
Fig. 3 is the equivalent circuit diagram of both ends direct current system MRTB/ERTB switch, wherein RMIndicate metallic(return) circuit resistance (pole
Line), LMMetallic return inductance (polar curve), RELIndicate earthing pole line resistance, REEIndicate ground connection electrode resistance, LELIndicate ground connection polar curve
Inductance, LGIndicate Ground return inductance, RGIndicate Ground return resistance, CSIndicate surge capacitor, IdcFor DC current.For two
Direct current system is held, the operation of direct current change-over switch is divided into following two:
First is that Ground return mode turns metallic return mode (DC circuit Ground return access turns metallic return access): first
First, closure ERTB forms metallic(return) circuit, since MRTB is in "on" position, at this time metallic(return) circuit and ground return circuit parallel running；
Then, MRTB is disconnected, DC current all flows through metallic(return) circuit, completes DC current and turns from ground return circuit to metallic(return) circuit
It changes.
Second is that metallic return mode turns Ground return mode: firstly, closure MRTB forms ground return circuit, since ERTB is in
"on" position, at this time metallic(return) circuit and ground return circuit parallel running；Then, ERTB is disconnected, DC current all flows through the earth and returns
Conversion of the DC current from metallic(return) circuit to ground return circuit is completed on road.
It also can analyze and learn from Fig. 3, since the change-over switch of both ends direct current system only has 2, the operation of each switch
State can have 2 kinds of disconnection and closure, therefore the method for operation of opposite ends direct current system shares 22=4 kinds.
Fig. 4 show the equivalent circuit diagram of three end direct current system MRTB/ERTB switch, and comparison diagram 2 and Fig. 3 can be seen that
Due to increasing a DC terminal newly, when three end direct current systems will be transformed into metallic return/the earth from Ground return/metallic return mode
When mode, the change-over switch operating method of response will become sufficiently complex, since both ends all have 2 directly to three end direct currents wherein
Change-over switch is flowed, therefore the method for operation of three end direct currents will up to 42=16 kinds.
Fig. 5 show the three end sides direct current system d in the state of turning metallic return from Ground return and is in metallic return mould
Formula, the side x are in the equivalent circuit diagram under the earth and metallic return modes parallel operating condition, and under such operating condition, the end d the earth is returned
Line current will flow into the station x by interconnection, so that the earth current in the station x greatly increases, it is bad by being generated to the operation of system
It influences.
When Fig. 6 (a)~(e) is that Ground return turns metallic return operation, the system equivalent circuit of change-over switch movement front and back
Figure.
Fig. 6 (a) is that the three end ends direct current system x are closed ERTB in the state of turning metallic return from Ground returnxPreceding is equivalent
Circuit diagram, at this point, MRTBxAnd MRTBdClosure.
The signal of three end direct current systems of conversion is received, Xiang Sanduan direct current system sends control enable signal, control described three
Direct current system is held to enter the state from the state shift metallic return access of Ground return access.To ERTBxSend the first closure
Instruction controls ERTBxClosure, obtains the circuit diagram such as Fig. 6 (b), and Fig. 6 (b) is in the state of turning metallic return from Ground return
Three the first inverter sides of end direct current system are closed the equivalent circuit diagram after Ground return change-over switch.Meanwhile control system sends the
One forbids instructing, to prevent ERTBd、 MRTBxAnd MRTBdMalfunction.
ERTBxClosed procedure is carried out according to the first close command, control system receives ERTBxAfter the feedback signal of closure,
To MRTBxThe first open command is sent, control disconnects MRTBx, the circuit diagram such as Fig. 6 (c) is obtained, Fig. 6 (c) is from Ground return
Three the first inverter sides of end direct current system disconnect the equivalent circuit diagram after metallic return change-over switch in the state of turning metallic return.
MRTBxOperation is turned off according to the first open command, control system receives MRTBxAfter the feedback signal of disconnection,
To ERTBdSend the second close command, control closure ERTBd, the circuit diagram such as Fig. 6 (d) is obtained, Fig. 6 (d) is from Ground return
Three the second inverter sides of end direct current system are closed the equivalent circuit diagram after Ground return change-over switch in the state of turning metallic return；
ERTBdClosed procedure is carried out according to the second close command, control system receives ERTBdAfter the feedback signal of closure,
To MRTBdThe first open command is sent, control disconnects MRTBd, the circuit diagram such as Fig. 6 (d) is obtained, Fig. 6 (e) is from Ground return
Three the second inverter sides of end direct current system disconnect the equivalent circuit diagram after metallic return change-over switch in the state of turning metallic return；Together
When to ERTBx、ERTBd、MRTBxAnd MRTBdIt sends second to forbid instructing, to prevent ERTBx、ERTBd、MRTBxAnd MRTBdMalfunction.
MRTBdOperation is turned off according to the second open command, Ground return is completed and turns the straight of the metallic return method of operation
Flow the operating process of change-over switch.
In conclusion turning the metallic return method of operation for Ground return, it is closed the ERTB of the side x firstx, it is then turned off x
The MRTB of sidex, reclose the ERTB of the side dd, finally disconnect the MRTB of the side dd.This operating method effectively prevents the side d electric current and falls
The case where filling the side x occurs, it is ensured that system safety operation.
The change-over switch movement that metallic return turns Ground return turns that metallic return is corresponding with Ground return, in metallic return
Under state, ERTBx、ERTBdClosure.The specific control process of direct current change-over switch are as follows: receive the letter of three end direct current systems of conversion
Number, Xiang Sanduan direct current system sends control enable signal, and control three end direct current system enters the shape from metallic return access
State turns to the state of Ground return access, to MRTBdThe first close command is sent, MRTB is controlleddClosure, meanwhile, control system hair
First is sent to forbid instructing, to prevent ERTBx、 ERTBdAnd MRTBxMalfunction.
MRTBdClosed procedure is carried out according to the first close command, control system receives MRTBdAfter the feedback signal of closure,
To ERTBdThe first open command is sent, control disconnects ERTBd。
ERTBdOperation is turned off according to the first open command, control system receives ERTBdAfter the feedback signal of disconnection,
To MRTBxSend the second close command, control closure MRTBx。
MRTBxClosed procedure is carried out according to the second close command, control system receives closure MRTBxAfter feedback signal, to
ERTBxThe second open command is sent, control disconnects ERTBx, while to ERTBx、ERTBd、 MRTBxAnd MRTBdSecond is sent to forbid
Instruction, to prevent ERTBx、ERTBd、MRTBxAnd MRTBdMalfunction.
ERTBxOperation is turned off according to the second open command, metallic return is completed and turns the straight of the Ground return method of operation
Flow the operating process of change-over switch.
In conclusion turning the Ground return method of operation for metallic return, it is closed the MRTB of the side d firstd, it is then turned off d
The ERTB of sided, reclose the MRTB of the side xx, finally disconnect the ERTB of the side xx.This operating method effectively prevents electric current reverse irrigation
Situation occurs, it is ensured that system safety operation.
It should be noted that for the various method embodiments described above, describing for simplicity, it is all expressed as a series of
Combination of actions, but those skilled in the art should understand that, the present invention is not limited by the sequence of acts described, because according to
According to the present invention, certain steps can use other sequences or carry out simultaneously.
Based on thought identical with the control method of direct current change-over switch in above-described embodiment, the present invention also provides direct currents
The control device of change-over switch, the device can be used for executing the control method of above-mentioned direct current change-over switch.For ease of description, directly
In the structural schematic diagram for flowing the control device embodiment of change-over switch, part related to the embodiment of the present invention illustrate only,
It will be understood by those skilled in the art that the restriction of schematic structure not structure twin installation, may include more more or less than illustrating
Component, perhaps combine certain components or different component layouts.
As described in Figure 7, the control device of direct current change-over switch includes control signal receiving module 510, first switch control
Module 520, second switch control module 530, third switch control module 540 and the 4th switch control module 550 are described in detail
It is as follows:
Signal receiving module 510 is controlled, for receiving the signal of three end direct current systems of conversion, Xiang Sanduan direct current system is sent
Enable signal is controlled, control three end direct current system enters the shape from state shift the second loop line access of the first loop line access
State；Wherein, three end direct current system includes the first inverter side and the second inverter side, and the first inverter side, the second inverter side are wrapped
Containing the first loop line and the second loop line.
First switch control module 520, for entering in three end direct current systems from the state shift of the first loop line access the
In the state of two loop line accesses, the first close command is sent to the first loop line change-over switch of the first inverter side, described in control
First loop line change-over switch of the first inverter side is closed；Simultaneously to the second loop line change-over switch of the first inverter side, the second inversion
The first loop line change-over switch, the second loop line change-over switch of side, which send first, to be forbidden instructing, to prevent first inverter side
Second loop line change-over switch, the first loop line change-over switch of the second inverter side and the second loop line change-over switch malfunction.
Second switch control module 530, the first loop line change-over switch for receiving the first inverter side are closed the anti-of completion
Second loop line change-over switch of feedback signal, the first inverter side of Xiang Suoshu sends the first open command, to control first inversion
Second loop line change-over switch of side disconnects.
Third switch control module 540, the second loop line change-over switch for receiving the first inverter side disconnect the anti-of completion
First loop line change-over switch of feedback signal, the second inverter side of Xiang Suoshu sends the second close command, to control second inversion
First loop line change-over switch of side is closed.
4th switch control module 550, the first loop line change-over switch for receiving the second inverter side are closed the anti-of completion
Second loop line change-over switch of feedback signal, the second inverter side of Xiang Suoshu sends the second open command, to control second inversion
Second loop line change-over switch of side disconnects.
In one embodiment, the control device of the direct current change-over switch further include: malfunction control module, for receiving the
Second loop line change-over switch of two inverter sides disconnects the feedback signal completed, and the first loop line conversion of the first inverter side of Xiang Suoshu is opened
It closes and the second loop line change-over switch, the first loop line change-over switch of the second inverter side and the second loop line change-over switch sends the respectively
Two forbid instructing, to prevent the first loop line change-over switch and the second loop line change-over switch, the second inversion of first inverter side
First loop line change-over switch of side and the second loop line change-over switch malfunction.
In an alternative embodiment, three end direct current system further includes rectification side；First inverter side is second inverse
Become side to be connected by DC line with the rectification side, in the first inverter side or the second inverter side being connected with the rectification side
In converter station, first inverter side is connected with the second inverter side by DC line.
In an alternative embodiment, first loop line is Ground return, and second loop line is metallic return；Described
One loop line change-over switch is Ground return change-over switch, for controlling the DC current of three end direct current system from metallic return
Access is converted to Ground return access；The second loop line change-over switch is metallic return change-over switch, for controlling described three
The DC current of end direct current system is converted to metallic return access from Ground return access.
In an alternative embodiment, first loop line is metallic return, and second loop line is Ground return；Described
One loop line change-over switch is metallic return change-over switch, for controlling the DC current of three end direct current system from Ground return
Access is converted to metallic return access；The second loop line change-over switch is Ground return change-over switch, for controlling described three
The DC current of end direct current system is converted to Ground return access from metallic return access.
It should be noted that the control of the control device of direct current change-over switch of the invention and direct current change-over switch of the invention
Method processed corresponds, in the technical characteristic and its advantages of the embodiment elaboration of the control method of above-mentioned direct current change-over switch
Suitable for the embodiment of the control device of direct current change-over switch, particular content can be found in chatting in embodiment of the present invention method
It states, details are not described herein again, hereby give notice that.
In addition, the logic of each program module is drawn in the embodiment of the control device of the direct current change-over switch of above-mentioned example
Divide and be merely illustrative of, can according to need in practical application, such as the configuration requirement of corresponding hardware or the reality of software
Above-mentioned function distribution is completed by different program modules, i.e., filled the control of the direct current change-over switch by existing convenient consideration
The internal structure set is divided into different program modules, to complete all or part of the functions described above.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, it may refer to the associated description of other embodiments.It is appreciated that term " first ", " second " used in wherein etc. is at this
For distinguishing object in text, but these objects should not be limited by these terms.
It will appreciated by the skilled person that realizing all or part of the process in above-described embodiment method, being can
It is completed with instructing relevant hardware by computer program, the program can be stored in a computer-readable storage and be situated between
In matter, sells or use as independent product.The more specific example (non-exhaustive list) of computer-readable medium includes
Below: there is the electrical connection section (electronic device) of one or more wirings, portable computer diskette box (magnetic device), arbitrary access
Memory (RAM), read-only memory (ROM), erasable edit read-only storage (EPROM or flash memory), optical fiber dress
It sets and portable optic disk read-only storage (CDROM).In addition, computer-readable medium, which can even is that, to be printed on it
The paper of described program or other suitable media, because can be for example by carrying out optical scanner to paper or other media, then
It edited, interpreted or is handled when necessary with other suitable methods electronically to obtain described program, then by it
Storage is in computer storage.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, should not be understood as to the invention patent range
Limitation.It should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the premise,
Various modifications and improvements can be made, and these are all within the scope of protection of the present invention.Therefore, the scope of protection of the patent of the present invention
It should be determined by the appended claims.
Claims (10)
1. a kind of control method of direct current change-over switch characterized by comprising
The signal of three end direct current systems of conversion is received, Xiang Sanduan direct current system sends control enable signal, it is straight to control three end
Streaming system enters the state from state shift the second loop line access of the first loop line access；Wherein, the three ends direct current system packet
The first inverter side and the second inverter side are included, the first inverter side, the second inverter side include the first loop line and the second loop line；
In the state that three end direct current systems enter from state shift the second loop line access of the first loop line access, to the first inversion
First loop line change-over switch of side sends the first close command, is closed with controlling the first loop line change-over switch of first inverter side
It closes, so that the first loop line access and the second loop line path in parallel are run；It is converted simultaneously to the second loop line of the first inverter side
Switch, the first loop line change-over switch of the second inverter side, the second loop line change-over switch, which send first, to be forbidden instructing, described to prevent
Second loop line change-over switch of the first inverter side, the first loop line change-over switch of the second inverter side and the second loop line change-over switch
Malfunction；
Receive the first inverter side the first loop line change-over switch closure complete feedback signal, the second of the first inverter side of Xiang Suoshu
Loop line change-over switch sends the first open command, is disconnected with controlling the second loop line change-over switch of first inverter side, so that
DC current flows through the second loop line access；
Receive the first inverter side the second loop line change-over switch disconnect complete feedback signal, the first of the second inverter side of Xiang Suoshu
Loop line change-over switch sends the second close command, to control the first loop line change-over switch closure of second inverter side；
Receive the second inverter side the first loop line change-over switch closure complete feedback signal, the second of the second inverter side of Xiang Suoshu
Loop line change-over switch sends the second open command, is disconnected with controlling the second loop line change-over switch of second inverter side；
Further include:
Receive the second inverter side the second loop line change-over switch disconnect complete feedback signal, the first of the first inverter side of Xiang Suoshu
The the first loop line change-over switch and the second loop line change-over switch of loop line change-over switch and the second loop line change-over switch, the second inverter side
It sends second respectively to forbid instructing, to prevent the first loop line change-over switch and the conversion of the second loop line of first inverter side from opening
Pass, the first loop line change-over switch of the second inverter side and the second loop line change-over switch malfunction.
2. the control method of direct current change-over switch according to claim 1, which is characterized in that three end direct current system is also
Including rectification side；
First inverter side or the second inverter side are connected by DC line with the rectification side, are connected with the rectification side
The first inverter side or the second inverter side converter station in, first inverter side and the second inverter side pass through DC line phase
Even.
3. the control method of direct current change-over switch according to claim 1, which is characterized in that
First loop line is Ground return, and second loop line is metallic return；
The first loop line change-over switch is Ground return change-over switch, for controlling the DC current of three end direct current system
Ground return access is converted to from metallic return access；
The second loop line change-over switch is metallic return change-over switch, for controlling the DC current of three end direct current system
Metallic return access is converted to from Ground return access.
4. the control method of direct current change-over switch according to claim 1, which is characterized in that
First loop line is metallic return, and second loop line is Ground return；
The first loop line change-over switch is metallic return change-over switch, for controlling the DC current of three end direct current system
Metallic return access is converted to from Ground return access；
The second loop line change-over switch is Ground return change-over switch, for controlling the DC current of three end direct current system
Ground return access is converted to from metallic return access.
5. a kind of control device of direct current change-over switch characterized by comprising
Signal receiving module is controlled, for receiving the signal of three end direct current systems of conversion, Xiang Sanduan direct current system, which sends control, to be made
Energy signal, control three end direct current system enter the state from state shift the second loop line access of the first loop line access；Its
In, three end direct current system includes the first inverter side and the second inverter side, and the first inverter side, the second inverter side include first
Loop line and the second loop line；
First switch control module, it is logical from the second loop line of state shift of the first loop line access for entering in three end direct current systems
In the state of road, the first close command is sent to the first loop line change-over switch of the first inverter side, to control first inversion
First loop line change-over switch of side is closed, so that the first loop line access and the second loop line path in parallel are run；Simultaneously to the
Second loop line change-over switch of one inverter side, the first loop line change-over switch of the second inverter side, the second loop line change-over switch are sent
First forbids instructing, to prevent the second loop line change-over switch of first inverter side, the first loop line conversion of the second inverter side
Switch and the second loop line change-over switch malfunction；
Second switch control module, the first loop line change-over switch for receiving the first inverter side are closed the feedback signal completed,
The first open command is sent to the second loop line change-over switch of first inverter side, to control the second of first inverter side
Loop line change-over switch disconnects, so that DC current flows through the second loop line access；
Third switch control module, the second loop line change-over switch for receiving the first inverter side disconnect the feedback signal completed,
The second close command is sent to the first loop line change-over switch of second inverter side, to control the first of second inverter side
Loop line change-over switch closure；
And the 4th switch control module, the first loop line change-over switch for receiving the second inverter side are closed the feedback completed
Second loop line change-over switch of signal, the second inverter side of Xiang Suoshu sends the second open command, to control second inverter side
The second loop line change-over switch disconnect；
Further include:
Malfunction control module, the second loop line change-over switch for receiving the second inverter side disconnects the feedback signal completed, to institute
State the first loop line change-over switch of the first inverter side and the first loop line change-over switch of the second loop line change-over switch, the second inverter side
It sends second respectively with the second loop line change-over switch to forbid instructing, to prevent the first loop line change-over switch of first inverter side
With the second loop line change-over switch, the first loop line change-over switch of the second inverter side and the second loop line change-over switch malfunction.
6. the control device of direct current change-over switch according to claim 5, which is characterized in that
Three end direct current system further includes rectification side；
First inverter side or the second inverter side are connected by DC line with the rectification side, are connected with the rectification side
The first inverter side or the second inverter side converter station in, first inverter side and the second inverter side pass through DC line phase
Even.
7. the control device of direct current change-over switch according to claim 5, which is characterized in that
First loop line is Ground return, and second loop line is metallic return；
The first loop line change-over switch is Ground return change-over switch, for controlling the DC current of three end direct current system
Ground return access is converted to from metallic return access；
The second loop line change-over switch is metallic return change-over switch, for controlling the DC current of three end direct current system
Metallic return access is converted to from Ground return access.
8. the control device of direct current change-over switch according to claim 5, which is characterized in that
First loop line is metallic return, and second loop line is Ground return；
The first loop line change-over switch is metallic return change-over switch, for controlling the DC current of three end direct current system
Metallic return access is converted to from Ground return access；
The second loop line change-over switch is Ground return change-over switch, for controlling the DC current of three end direct current system
Ground return access is converted to from metallic return access.
9. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is held by processor
The step of Claims 1-4 any the method is realized when row.
10. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the processor realizes the step of Claims 1-4 any the method when executing described program
Suddenly.
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| CN111244998B (en) * | 2020-01-14 | 2021-11-19 | 南方电网科学研究院有限责任公司 | Control method and device for converting single-pole ground return wire into metal return wire and storage medium |
| CN112260303B (en) * | 2020-06-04 | 2022-08-12 | 许继集团有限公司 | LCC parallel three-terminal metal ground transfer switch sequence coordination control method and system |
| CN113555858B (en) * | 2021-07-28 | 2022-08-16 | 中国南方电网有限责任公司超高压输电公司昆明局 | Control method, device and protection system for direct current power transmission system under metal return wire |
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| CN106532659A (en) * | 2016-12-15 | 2017-03-22 | 国家电网公司 | Control protective method for ultra-high-voltage direct-current engineering direct-current change-over switch with parallel structure |
| CN106936153A (en) * | 2017-04-28 | 2017-07-07 | 南方电网科学研究院有限责任公司 | A kind of new extra-high voltage DC transmission system and method for operation changing method |
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| CN106532659A (en) * | 2016-12-15 | 2017-03-22 | 国家电网公司 | Control protective method for ultra-high-voltage direct-current engineering direct-current change-over switch with parallel structure |
| CN106936153A (en) * | 2017-04-28 | 2017-07-07 | 南方电网科学研究院有限责任公司 | A kind of new extra-high voltage DC transmission system and method for operation changing method |
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