CN113949256A - Topological structure for soft start control of converter of flexible direct-current distribution network - Google Patents
Topological structure for soft start control of converter of flexible direct-current distribution network Download PDFInfo
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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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 application discloses topological structure of soft control of starting of flexible direct current distribution network transverter, including key components and parts such as time relay and control relay, adopt the redundant control logic of time relay and control relay, can adjust the soft input time of starting in a flexible way manually, automatically on the one hand, on the other hand can ensure that the reliable switching of soft start can adjust the soft input time of starting in a flexible way to ensure the smooth switching of soft start, strengthened the reliability of system operation. And through increasing soft start resistance energy judgement condition, after soft start resistance energy is greater than the setting value, control system directly jumps out the inlet wire circuit breaker to soft start resistance damages because of the energy is too high. Therefore, the technical problem of poor reliability of soft start control in the prior art is solved.
Description
Technical Field
The application relates to the technical field of direct current transmission, in particular to a topological structure for soft start control of a converter of a flexible direct current distribution network.
Background
At present, a flexible direct current distribution network converter limits overcurrent by inputting a soft start resistor, and the soft start resistor is cut off by a bypass breaker after precharge is completed. Because the soft start resistor is required to limit overcurrent, the soft start resistor is easy to damage due to heat effect accumulation, and therefore the design of the soft start resistor needs to provide design requirements for the resistance value, the starting time, the heat insulation energy and the like of the soft start resistor by researching different starting working conditions.
The soft start resistance switching is mainly carried out by adopting a relay control mode at present, the switching time is completely controlled by background software, so that the soft start failure condition can occur once the background is down in the soft start process, and the normal state can be recovered only by restarting the background once or for multiple times. Generally, the longer the system running time is, the higher the probability of downtime in the background is, and the higher the probability of failure of soft start is.
Therefore, in order to improve the reliability of the system soft start, it is necessary to improve the soft start control logic.
Disclosure of Invention
An object of the application is to provide a topological structure for soft start control of a converter of a flexible direct-current distribution network, which is used for solving the technical problem of poor reliability of soft start control in the prior art.
In view of this, the present application provides a flexible dc distribution network converter soft start control topology structure, including: the circuit breaker comprises an incoming line breaker, a bypass breaker, a relay K2, a time relay KT and a soft start resistor;
the control circuit of inlet wire circuit breaker with bypass circuit breaker's control circuit all includes: the device comprises an electrode M, an opening coil A4, a closing coil A2 and a plurality of auxiliary contacts;
the first end of the electrode M is connected to the anode of the direct current distribution network, and the second end of the electrode M is connected to the cathode of the direct current distribution network;
the first end of the relay K2 is connected to the anode of the direct-current distribution network, the second end of the relay K2 is connected to the first end of a closing coil A2 of the incoming line breaker, and the second end of the closing coil A2 of the incoming line breaker is connected to the cathode of the direct-current distribution network; the relay K2 is used for responding to a control instruction to act so as to enable the incoming line breaker to be switched on;
the first end of the time relay KT is connected to the anode of a direct-current distribution network, the second end of the time relay KT is connected to the first end of a closing coil A2 of the bypass circuit breaker, and the second end of the closing coil A2 of the bypass circuit breaker is connected to the cathode of the direct-current distribution network; the time relay KT is used for closing when a preset action time is reached, so that the bypass circuit breaker is switched on;
the bypass circuit breaker is used for controlling the soft start resistance switching.
Optionally, the method further comprises: a button SA 2;
the button SA2 is connected in parallel with the relay K2 and used for responding to an operation instruction of an operation and maintenance worker, so that the incoming line breaker is switched on.
Optionally, the method further comprises: a relay K4;
the relay K4 is connected with the time relay KT in parallel and used for responding to a system instruction to act when the preset action time is reached, so that the bypass breaker is switched on.
Optionally, the method further comprises: a relay K1;
the first end of the relay K1 is connected to the anode of the direct-current distribution network, the second end of the relay K1 is connected to one end of the opening coil A4 of the incoming line breaker, and the other end of the opening coil A4 of the incoming line breaker is connected to the cathode of the direct-current distribution network;
the relay K1 is used for responding the system instruction to act, so that the system is normally shut down.
Optionally, the method further comprises: a button SA 1;
the button SA1 is connected in parallel with the relay K1 and used for responding to operation instructions of operation and maintenance personnel so as to open the incoming line breaker.
Optionally, the method further comprises: a relay K3;
the first end of the relay K3 is connected to the anode of the direct current distribution network, the second end is connected to one end of the opening coil A4 of the bypass breaker, and the other end of the opening coil A4 of the bypass breaker is connected to the cathode of the direct current distribution network;
the relay K1 is used for responding the system instruction to act, so that the system is normally shut down.
Optionally, the method further comprises: a button SA 3;
the button SA3 is connected in parallel with the relay K1 and is used for responding to operation and maintenance personnel operation instructions so as to open the bypass breaker.
Optionally, the method further comprises: an emergency button;
the first end of the emergency button is respectively connected with one end of a tripping coil A4 of the bypass breaker and one end of a tripping coil A4 of the incoming line breaker, and the second end of the emergency button is connected with the anode of a direct current distribution network; and the circuit breaker is used for acting when the system has a fault, so that the bypass circuit breaker and the incoming line circuit breaker are disconnected.
Optionally, the method further comprises: the system comprises an acquisition and calculation module and an analysis control module;
the acquisition and calculation module is used for acquiring a current signal of a system and calculating to obtain heat accumulation according to the current signal;
and the analysis control module is used for judging whether the heat accumulation is larger than a soft resistance heat limiting value or not, if so, controlling the incoming line breaker to be disconnected, otherwise, disconnecting the bypass breaker to cut off the soft start resistance when the current signal is unchanged within preset time.
Compared with the prior art, the embodiment of the application has the advantages that:
in the embodiment of the application, a topological structure for soft start control of a converter of a flexible direct-current distribution network is provided, and the topological structure comprises a time relay, a control relay and other key components, and the redundant control logic of the time relay and the control relay is adopted, so that on one hand, the soft start input time can be manually and automatically and flexibly adjusted, on the other hand, the soft start reliable switching can be ensured, the soft start input time can be flexibly adjusted, the soft start smooth switching is ensured, and the reliability of system operation is enhanced. And through increasing soft start resistance energy judgement condition, after soft start resistance energy is greater than the setting value, control system directly jumps out the inlet wire circuit breaker to soft start resistance damages because of the energy is too high. The topology is low in cost and convenient to popularize and apply. Therefore, the technical problem of poor reliability of soft start control in the prior art is solved.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of a topological loop of a topological structure for soft start control of a converter of a flexible direct-current distribution network according to an embodiment of the present application;
fig. 2 is a schematic main circuit diagram of a topology structure for soft start control of a converter of a flexible direct-current distribution network according to an embodiment of the present application.
Reference numbers: QS1, incoming line breaker; QS2, bypass breaker; ra, Rb, Rc: a soft start resistance.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1 and fig. 2, a topology structure for soft start control of a converter of a flexible dc distribution network according to an embodiment of the present application includes:
the circuit comprises an incoming line breaker QS1, a bypass breaker QS2, a relay K2, a time relay KT and soft start resistors Ra, Rb and Rc;
as shown in fig. 1, a1-a2 is an auxiliary contact of the time relay KT.
The control loop of the incoming circuit breaker QS1 and the control loop of the bypass circuit breaker QS2 each comprise: the device comprises an electrode M, an opening coil A4, a closing coil A2 and a plurality of auxiliary contacts;
as shown in fig. 1, it should be noted that the auxiliary contacts of the control circuit include: auxiliary contacts 11-12, auxiliary contacts 11-14, and auxiliary contacts 21-22.
The first end of the electrode M is connected with the anode of the direct current distribution network, and the second end of the electrode M is connected with the cathode of the direct current distribution network;
a first end of the relay K2 is connected to the anode of the direct current distribution network, a second end of the relay K2 is connected to a first end of a closing coil A2 of a line incoming breaker QS1, and a second end of a closing coil A2 of the line incoming breaker QS1 is connected to the cathode of the direct current distribution network; the relay K2 is used for responding to a control instruction to act so that the incoming line breaker QS1 is switched on;
a first end of the time relay KT is connected with the anode of the direct current distribution network, a second end of the time relay KT is connected with a first end of a closing coil A2 of a bypass circuit breaker QS2, and a second end of a closing coil A2 of the bypass circuit breaker QS2 is connected with the cathode of the direct current distribution network; the time relay KT is used for closing when preset action time is reached, so that the bypass circuit breaker QS2 is switched on;
and the bypass breaker QS2 is used for controlling the switching of soft start resistors Ra, Rb and Rc.
It should be noted that, as shown by the dashed line box in fig. 2, the soft-start resistor of the present embodiment includes: soft-start resistances Ra, Rb, Rc. The main loop topology of the system soft start comprises an incoming breaker QS1, a bypass breaker QS2 and soft start resistors Ra, Rb and Rc, wherein the bypass breaker QS2 is used for controlling the switching of the soft start resistors Ra, Rb and Rc. The logic of the normal start of the system is as follows: closing a line incoming breaker QS1, entering a soft start stage at the moment, and putting soft start resistors Ra, Rb and Rc into the soft start stage; after a period of time, the soft start resistors Ra, Rb and Rc are switched off by a bypass breaker QS 2.
The following is a description of the working principle:
as shown in fig. 1, in an initial state, both the incoming breaker QS1 and the bypass breaker QS2 are in an open state; subsequently, the remote control relay K2 acts to close the incoming breaker QS 1. After QS1 is switched on, soft-start resistors Ra, Rb and Rc are put into operation, auxiliary contacts 11-14 of an incoming line breaker QS1 are switched from normally open to normally closed, at the moment, a coil of a time relay KT is electrified to act, auxiliary contacts 15-18 of the time relay KT are controlled to be closed according to the set time of the time relay KT, and meanwhile, a background controls the action of a relay K4 through timing; when the auxiliary contacts 15-18 of the time relay KT are closed, the bypass breaker QS2 is switched on, and the soft start resistor is cut off.
Further, in an optional embodiment, the method further comprises: a button SA 2; the button SA2 is connected in parallel with the relay K2 and is used for responding to an operation instruction of an operation and maintenance person, so as to close the incoming line breaker QS 1.
It can be understood that the button SA2 designed in this embodiment enables an operator to manually operate the button SA2, so that the incoming line breaker QS1 is switched on, and flexibility and reliability of soft start control are improved.
Further, in an optional embodiment, the method further comprises: a relay K4; the relay K4 is connected in parallel with the time relay KT and used for responding to a system instruction to act when the preset action time is reached, so that the bypass breaker QS2 is switched on.
It can be understood that the relay K4 designed in this embodiment, when reaching the preset action time, closes the time relay KT, so that the bypass breaker QS2 is closed. The relay K4 can also act in response to a system command, so that the bypass breaker QS2 is closed.
Further, in an optional embodiment, the method further comprises: relay K1, button SA1, relay K3 and button SA 3;
the first end of the relay K1 is connected to the anode of the direct current distribution network, the second end is connected to one end of a tripping coil A4 of a line incoming breaker QS1, and the other end of the tripping coil A4 of the line incoming breaker QS1 is connected to the cathode of the direct current distribution network; the relay K1 is used to act in response to system commands to cause the system to shutdown normally.
The button SA1 is connected in parallel to the relay K1 and is used for responding to an operation and maintenance personnel operation command, so as to open the incoming line breaker QS 1.
A first end of the relay K3 is connected to the anode of the direct current distribution network, a second end of the relay K3 is connected to one end of a brake-separating coil A4 of a bypass breaker QS2, and the other end of the brake-separating coil A4 of the bypass breaker QS2 is connected to the cathode of the direct current distribution network; the relay K1 is used to act in response to system commands to cause the system to shutdown normally.
The button SA3 is connected in parallel to the relay K1 and is used for responding to an operation and maintenance personnel operation command so as to open the bypass breaker QS 2.
It should be noted that, as shown in fig. 1, the system can be normally shut down by controlling the relays K1, K3, or manually opening the brake buttons SA1, SA3 to open the incoming line breaker QS1 and the bypass breaker QS 2; if emergency such as failure occurs, the emergency can be quickly realized through the JT switch, and unnecessary loss is reduced.
Referring to fig. 1 and fig. 2, a topology structure for soft start control of a converter of a flexible dc distribution network according to a second embodiment of the present application includes:
the system comprises an incoming line breaker QS1, a bypass breaker QS2, a relay K2, a time relay KT, a soft start resistor, an acquisition and calculation module and an analysis and control module (the acquisition and calculation module and the analysis and control module are not shown in figures 1 and 2, and the two modules are two virtual functional modules of the system); the control loop of the incoming circuit breaker QS1 and the control loop of the bypass circuit breaker QS2 each comprise: the device comprises an electrode M, an opening coil A4, a closing coil A2 and a plurality of auxiliary contacts; the first end of the electrode M is connected with the anode of the direct current distribution network, and the second end of the electrode M is connected with the cathode of the direct current distribution network; a first end of the relay K2 is connected to the anode of the direct current distribution network, a second end of the relay K2 is connected to a first end of a closing coil A2 of the incoming line breaker, and a second end of a closing coil A2 of the incoming line breaker QS1 is connected to the cathode of the direct current distribution network; the relay K2 is used for responding to a control instruction to act so that the incoming line breaker QS1 is switched on; a first end of the time relay KT is connected with the anode of the direct current distribution network, a second end of the time relay KT is connected with a first end of a closing coil A2 of a bypass breaker QS1, and a second end of the closing coil A2 of the bypass breaker is connected with the cathode of the direct current distribution network; the time relay KT is configured to close when a preset action time is reached, so that the bypass breaker QS2 is closed.
The acquisition and calculation module is used for acquiring current signals of the soft start resistor and calculating according to the current signals to obtain heat accumulation;
and the analysis control module is used for judging whether the heat accumulation is larger than the soft resistance heat limiting value, controlling the QS1 to be switched off if the heat accumulation is larger than the soft resistance heat limiting value, and switching off the QS2 to cut off the soft start resistance if the current signal is not changed within the preset time.
It should be noted that, at the beginning, the incoming line breaker QS1 is switched on, the sub-module starts to charge, the direct current voltage and the sub-module capacitor voltage start to slowly rise due to the limitation of the soft start resistor, at this time, the charging current flows through the soft start resistors Ra, Rb and Rc, the soft start resistor generates heat accumulation, the control protection system performs heat accumulation calculation on the collected current signal in real time, when the heat accumulation exceeds the soft start resistor heat limit value Qlim, the incoming line breaker QS1 is tripped, and the start fails; and if not, continuing to charge the sub-module of the flexible-direct converter valve, continuing to increase the capacitor voltage of the sub-module, stabilizing the charging current at a certain value, and cutting off the soft start resistor.
In the topology structure for soft start control of the converter of the flexible direct-current distribution network provided by the second embodiment of the application, the control logic of soft start switching is as follows: closing the incoming line breaker QS1, starting soft start, judging whether the soft start resistance energy is larger than a set value Qlim or not in the soft start process, if so, tripping off the bypass breaker QS1, and if the judgment condition is met, switching on the bypass breaker QS2 through a dual control strategy of a time relay KT and a control relay K4 so as to realize that the soft start resistances Ra, Rb and Rc are reliably cut off within a specified time.
In the above embodiment of the application, a topological structure for soft start control of a converter of a flexible direct-current distribution network is provided, including key components such as a time relay and a control relay, and by adopting redundancy control logics of the time relay and the control relay, on one hand, soft start input time can be manually and automatically and flexibly adjusted, on the other hand, soft start reliable switching can be ensured, soft start input time can be flexibly adjusted, soft start smooth switching can be ensured, and reliability of system operation is enhanced. And through increasing soft start resistance energy judgement condition, after soft start resistance energy is greater than the setting value, control system directly jumps out the inlet wire circuit breaker to soft start resistance damages because of the energy is too high. The topology is low in cost and convenient to popularize and apply. Therefore, the technical problem of poor reliability of soft start control in the prior art is solved.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. The utility model provides a topological structure of soft start control of flexible direct current distribution network transverter which characterized in that includes: the circuit breaker comprises an incoming line breaker, a bypass breaker, a relay K2, a time relay KT and a soft start resistor;
the control circuit of inlet wire circuit breaker with bypass circuit breaker's control circuit all includes: the device comprises an electrode M, an opening coil A4, a closing coil A2 and a plurality of auxiliary contacts;
the first end of the electrode M is connected to the anode of the direct current distribution network, and the second end of the electrode M is connected to the cathode of the direct current distribution network;
the first end of the relay K2 is connected to the anode of the direct-current distribution network, the second end of the relay K2 is connected to the first end of a closing coil A2 of the incoming line breaker, and the second end of the closing coil A2 of the incoming line breaker is connected to the cathode of the direct-current distribution network; the relay K2 is used for responding to a control instruction to act so as to enable the incoming line breaker to be switched on;
the first end of the time relay KT is connected to the anode of a direct-current distribution network, the second end of the time relay KT is connected to the first end of a closing coil A2 of the bypass circuit breaker, and the second end of the closing coil A2 of the bypass circuit breaker is connected to the cathode of the direct-current distribution network; the time relay KT is used for closing when a preset action time is reached, so that the bypass circuit breaker is switched on;
the bypass circuit breaker is used for controlling the soft start resistance switching.
2. The topology structure for soft start control of a converter of a flexible direct current distribution network according to claim 1, further comprising: a button SA 2;
the button SA2 is connected in parallel with the relay K2 and used for responding to an operation instruction of an operation and maintenance worker, so that the incoming line breaker is switched on.
3. The topology structure for soft start control of a converter of a flexible direct current distribution network according to claim 1, further comprising: a relay K4;
the relay K4 is connected with the time relay KT in parallel and used for responding to a system instruction to act when the preset action time is reached, so that the bypass breaker is switched on.
4. The topology structure for soft start control of a converter of a flexible direct current distribution network according to claim 1, further comprising: a relay K1;
the first end of the relay K1 is connected to the anode of the direct-current distribution network, the second end of the relay K1 is connected to one end of the opening coil A4 of the incoming line breaker, and the other end of the opening coil A4 of the incoming line breaker is connected to the cathode of the direct-current distribution network;
the relay K1 is used for responding the system instruction to act, so that the system is normally shut down.
5. The topology structure for soft start control of a converter of a flexible direct current distribution network according to claim 4, further comprising: a button SA 1;
the button SA1 is connected in parallel with the relay K1 and used for responding to operation instructions of operation and maintenance personnel so as to open the incoming line breaker.
6. The topology structure for soft start control of a converter of a flexible direct current distribution network according to claim 1, further comprising: a relay K3;
the first end of the relay K3 is connected to the anode of the direct current distribution network, the second end is connected to one end of the opening coil A4 of the bypass breaker, and the other end of the opening coil A4 of the bypass breaker is connected to the cathode of the direct current distribution network;
the relay K1 is used for responding the system instruction to act, so that the system is normally shut down.
7. The topology structure for soft start control of a converter of a flexible direct current distribution network according to claim 6, further comprising: a button SA 3;
the button SA3 is connected in parallel with the relay K1 and is used for responding to operation and maintenance personnel operation instructions so as to open the bypass breaker.
8. The topology structure for soft start control of a converter of a flexible direct current distribution network according to claim 1, further comprising: an emergency button;
the first end of the emergency button is respectively connected with one end of a tripping coil A4 of the bypass breaker and one end of a tripping coil A4 of the incoming line breaker, and the second end of the emergency button is connected with the anode of a direct current distribution network; and the circuit breaker is used for acting when the system has a fault, so that the bypass circuit breaker and the incoming line circuit breaker are disconnected.
9. The topology structure for soft start control of a converter of a flexible direct current distribution network according to claim 1, further comprising: the system comprises an acquisition and calculation module and an analysis control module;
the acquisition and calculation module is used for acquiring current signals of the soft start resistor and calculating to obtain heat accumulation according to the current signals;
and the analysis control module is used for judging whether the heat accumulation is larger than a soft resistance heat limiting value or not, if so, controlling the incoming line breaker to be disconnected, otherwise, disconnecting the bypass breaker to cut off the soft start resistance when the current signal is unchanged within preset time.
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