CN111478368B - Connection transformer switching method, system and equipment for hot standby connection transformer circuit - Google Patents
Connection transformer switching method, system and equipment for hot standby connection transformer circuit Download PDFInfo
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
- H02H9/002—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off limiting inrush current on switching on of inductive loads subjected to remanence, e.g. transformers
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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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- 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
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Abstract
The invention relates to the technical field of offshore power generation and transmission, in particular to a method, a system and equipment for inputting a connecting transformer for a hot standby connecting transformer circuit, which are used for solving the technical problem of excitation inrush current caused by switching-on deviation of a phase selection switching-on device. The invention comprises the following steps: switching a control mode in the flexible direct current converter valve to an alternating current voltage controller control mode through a control system; adjusting an alternating voltage controller through a control system, and reducing the alternating voltage of the hot standby connection transformer circuit to a preset value; and controlling another group of alternating current circuit breakers to complete switching on through a control system, and realizing the input of a hot standby connecting transformer of the hot standby connecting transformer circuit.
Description
Technical Field
The invention relates to the technical field of offshore power generation and transmission, in particular to a method, a system and equipment for inputting a connecting transformer for a hot standby connecting transformer circuit.
Background
In recent years, with the implementation of the policy of sustainable development in China, solar energy and wind energy are developing vigorously to represent a series of renewable energy power generation technologies. The wind power technology comprises two branches of onshore wind power and offshore wind power, the offshore wind power has higher construction difficulty than onshore wind power, and special requirements are provided for the wind power grid-connected technology. The aim of the offshore wind power engineering is to deliver electric energy generated by an offshore wind farm to land and realize grid connection with a land power grid. The offshore wind power engineering generally comprises an offshore wind power plant, an offshore booster station, a submarine cable, an onshore cable and an onshore converter station. The offshore booster station has the function of collecting and boosting the electric energy of the wind power plant, the offshore converter station has the function of converting the alternating current of the offshore booster station into direct current through a rectification technology and transmitting the direct current to the onshore converter station through a submarine cable and an onshore cable, and the onshore converter station converts the electric energy from the direct current into the alternating current and realizes the grid connection with an onshore power grid.
In the prior art, two strategies for connecting transformers are currently put into service and completed: 1. switching on by using a phase selection switching-on device; 2. and closing by using a closing resistor. In both schemes, a connecting transformer is put into the transformer under the rated AC voltage. The phase selection closing device is used for selecting the closing time of the connecting transformer at the peak value time of each phase voltage, so that the magnetic flux variation of the transformer during closing is the lowest, and the magnetizing inrush current during closing is restrained. The switching-on resistor is used for switching on the switching-on resistor firstly in the switching-on process to limit the magnetizing inrush current, and then switching on the breaker to form a bypass for the switching-on resistor.
The problem that exists among the prior art is to select the shortcoming of looks closing device to have: and the alternating current voltage before the second connecting transformer is switched on is a rated value, and the second connecting transformer is switched on by the phase selection switching-on device. The principle of the phase selection switching-on device is to detect the phase of the primary side voltage of the connected transformer and take account of the switching-on delay of the breaker, so that the voltage of the transformer is at the peak value when the transformer is actually switched on. Due to the fact that the closing time of the circuit breaker is dispersive, the closing time of the transformer determined by the phase selection closing device has large deviation. The deviation can be as high as 30 degrees and more according to field operation experience. The deviation of the connection transformer switching-on phase causes the attenuated non-periodic component of the transformer iron core magnetic flux after switching-on, and the non-periodic component is superposed with the periodic component to cause the iron core saturation and the magnetizing inrush current. The magnetizing inrush current is mainly composed of low harmonics of 7 th order or less, and the voltage generated by the current on the ac-side impedance may cause an overvoltage phenomenon in the ac system, especially in the case where the system is weak or a low-order resonance point exists. Generally, if an alternating current system is a strong system (such as an alternating current system of a large power grid), system overvoltage caused by magnetizing inrush current is not obvious, but an alternating current system of an offshore wind farm is very weak, and the short-circuit capacity is only 2 times of direct current transmission power, so that the overvoltage condition caused by the magnetizing inrush current is especially obvious. The overvoltage generated when the second connecting transformer is switched on threatens the safety of equipment. The disadvantages for the closing resistor are: primary equipment is required to be added, the occupied area and the weight of the offshore converter station platform are increased, the engineering cost is increased, and the difficulty of construction is increased.
The technical problem of excitation inrush current caused by closing deviation of a phase selection closing device exists in the prior art.
Disclosure of Invention
The invention provides a method, a system and equipment for inputting a connecting transformer for a hot standby connecting transformer circuit, which solve the technical problem of excitation inrush current caused by closing deviation of a phase selection closing device in the prior art.
The embodiment of the invention provides a connecting transformer switching method for a hot standby connecting transformer circuit, wherein the hot standby connecting transformer circuit comprises a flexible direct current converter valve, a control system, two groups of connecting transformers and two groups of alternating current circuit breakers, each group of alternating current circuit breakers is respectively connected with one group of connecting transformers in series, the two groups of connecting transformers are connected in parallel, the flexible direct current converter valve is connected in series on the parallel circuit of the two groups of connecting transformers, the control system controls the flexible direct current converter valve and the two groups of alternating current circuit breakers, one group of alternating current circuit breakers are in a switching-on state, and the method comprises the following steps:
switching a control mode in the flexible direct current converter valve to an alternating current voltage controller control mode through a control system;
adjusting an alternating voltage controller through a control system, and reducing the alternating voltage of the hot standby connection transformer circuit to a preset value;
and controlling another group of alternating current circuit breakers to complete switching on through a control system, and realizing the input of a hot standby connecting transformer of the hot standby connecting transformer circuit.
Wherein, control another group through control system the alternating current circuit breaker accomplishes the combined floodgate, still include after realizing the input of hot reserve coupling transformer to hot reserve coupling transformer circuit:
regulating an AC voltage controller by the control system to raise the AC voltage of the hot standby coupling transformer circuit to a nominal value;
and switching the control mode in the flexible direct current converter valve to a reactive power controller control mode through the control system.
Wherein, control another group through control system the exchange circuit breaker switching-on process includes:
detecting the alternating voltage of the hot standby connection transformer circuit through a control system to obtain the alternating voltage of the hot standby connection transformer circuit;
judging whether the alternating voltage of the hot standby connection transformer circuit is reduced to a preset value;
when the alternating current voltage of the hot standby connection transformer circuit is reduced to a preset value, the control system sends a closing instruction to the other group of alternating current circuit breakers after delay time;
and according to the closing instruction, the other group of the alternating current circuit breakers complete closing.
Wherein the step of boosting the AC voltage of the hot standby coupling transformer circuit to a nominal value by the control system regulating the AC voltage controller comprises:
adjusting elements in an alternating current voltage controller through the control system to obtain a preset rate of rise of the alternating current voltage of the hot standby coupling transformer circuit;
increasing the AC voltage of the hot standby coupling transformer circuit to a rated value according to a preset rate of increase of the AC voltage of the hot standby coupling transformer circuit.
Wherein the sum of the time for completing the step of reducing the alternating voltage of the hot standby coupling transformer circuit to a predetermined value and the step of controlling the other set of alternating current circuit breakers to complete the closing by the control system is less than time T.
Wherein the preset value is 0.3p.u-0.5p.u; the rated value is 1p.u., the delay time is 50ms, the preset rate is 0.51p.u./s, and the time T is 0.625s.
Another aspect of an embodiment of the present invention provides a coupling transformer commissioning system for a hot standby coupling transformer circuit, comprising:
the switching module 201 is configured to switch a control mode in the flexible dc converter valve to an ac voltage controller control mode through the control system;
the adjusting module 202 is used for adjusting the alternating voltage controller through a control system, and reducing the alternating voltage of the hot standby connection transformer circuit to a preset value;
and the input module 203 is used for controlling another group of alternating current circuit breakers to complete switching on through a control system, so that the input of a hot standby connecting transformer of the hot standby connecting transformer circuit is realized.
Wherein, still include after the module of throwing:
regulating an AC voltage controller by the control system to raise the AC voltage of the hot standby coupling transformer circuit to a nominal value;
and switching the control mode in the flexible direct current converter valve to a reactive power controller control mode through the control system.
Wherein, control another group through control system the exchange circuit breaker switching-on process includes:
detecting the alternating voltage of the hot standby connection transformer circuit through a control system to obtain the alternating voltage of the hot standby connection transformer circuit;
judging whether the alternating voltage of the hot standby connection transformer circuit is reduced to a preset value;
when the alternating current voltage of the hot standby connection transformer circuit is reduced to a preset value, the control system sends a closing instruction to the other group of alternating current circuit breakers after delay time;
and according to the closing instruction, the other group of the alternating current circuit breakers complete closing.
Embodiments of the present invention also provide a coupling transformer commissioning device for a hot standby coupling transformer circuit, comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute a coupling transformer commissioning method for a hot standby coupling transformer circuit as described above according to instructions in the program code.
According to the technical scheme, the embodiment of the invention has the following advantages:
1. the phase selection switching-on device does not need to be installed on the alternating current switch, so that the problem of excitation inrush current caused by switching-on deviation of the phase selection switching-on device is solved;
2. a closing resistor is not required to be installed on the alternating current switch, so that the engineering investment is saved, and the occupied area and the weight of the offshore platform are reduced;
3. a better method is provided for the input of the second connecting transformer, the magnetizing inrush current during switching-on is reduced, the equipment safety is improved, primary equipment is not added, and the economical efficiency of the engineering is guaranteed.
The technical problem of excitation inrush current caused by closing deviation of a phase selection closing device in the prior art is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a diagram of a main wiring pattern of an offshore converter station;
FIG. 2 is a method flow diagram of a method, system and apparatus for commissioning a connection transformer for a hot standby connection transformer circuit according to an embodiment of the present invention;
FIG. 3 is a block diagram of a system configuration of a coupling transformer commissioning method, system and apparatus for a hot standby coupling transformer circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an apparatus structure of a connection transformer commissioning method, a system and an apparatus thereof for a hot standby connection transformer circuit according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, 1 is an ac circuit breaker, 2 is a coupling transformer, 3 is a resistor, 4 is a bridge arm reactor, 5 is a flexible dc converter valve, and 6 is a submarine cable; the converter station for offshore wind power engineering is characterized in that two connecting transformers are connected in parallel and are mutually in hot standby, and during normal operation, the two connecting transformers are switched on simultaneously before direct current starting, and the alternating current voltage before switching on is 0. However, when one connecting transformer is overhauled, the other connecting transformer operates independently, and after the overhaul is finished, the overhauled transformer needs to be switched on under the rated alternating voltage.
The reason that the excitation inrush current is generated when the connection transformer is switched on is that the magnetic flux phase caused by the alternating voltage is inconsistent with the transformer residual magnetism phase, if the alternating voltage phase at the switching-on moment is 0 degree (voltage minimum) of a sine wave, the magnetic flux phase caused by the alternating voltage is 90 degrees (magnetic flux positive maximum), and the residual magnetism before the connection transformer is switched on is assumed to be 0, at the switching-on moment, because the total magnetic flux of the iron core cannot be suddenly changed, an aperiodic component with the same amplitude and the opposite direction to the alternating voltage magnetic flux is generated in the iron core. Then, at the moment of closing, the total magnetic flux of the transformer core is 0, but the direction of the magnetic flux caused by the alternating voltage is opposite after a half period, so that the total magnetic flux of the transformer core is 2p.u. after the non-periodic component is superposed in the same direction, the transformer is saturated, and the magnetizing inrush current is generated.
The embodiment of the invention provides a method, a system and a device for inputting a connecting transformer for a hot standby connecting transformer circuit, which are used for solving the technical problem of excitation inrush current caused by switching-on deviation of a phase selection switching-on device in the prior art.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the 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 invention.
Referring to fig. 2, a connection transformer switching method for a hot standby connection transformer circuit according to an embodiment of the present invention is provided, where the hot standby connection transformer circuit includes a flexible dc converter valve, a control system, two sets of connection transformers and two sets of ac circuit breakers, each set of ac circuit breaker is respectively connected in series with one set of connection transformer, the two sets of connection transformers are connected in parallel, the flexible dc converter valve is connected in series with the parallel circuit of the two sets of connection transformers, and the control system controls the flexible dc converter valve and the two sets of ac circuit breakers, where one set of ac circuit breaker is in a closed state;
the hot standby connection transformer circuit is a connection circuit in the converter station of the offshore wind power engineering. The control system controls the hot standby connection transformer circuit, the two groups of connection transformers which are mutually hot standby are correspondingly connected with the alternating current circuit breakers in series, and the alternating current circuit breakers can control the corresponding connection transformers to be put into the hot standby connection transformer circuit. In general, two groups of connecting transformers are put into a hot standby connecting transformer circuit to work, when one group of connecting transformers breaks down, the other group of connecting transformers can still continue to work, and the phenomenon that the offshore power grid system is interrupted due to the fact that one group of connecting transformers breaks down is avoided. After the faulty connecting transformer is repaired, the repaired connecting transformer needs to be put into the hot standby connecting transformer circuit again, and the work of protecting the offshore power grid system can be continued.
The method comprises the following steps:
switching a control mode in the flexible direct current converter valve to an alternating current voltage controller control mode through a control system; the flexible direct current converter valve comprises a reactive power controller control mode and an alternating voltage controller control mode, wherein the reactive power controller control mode is a control mode of the reactive power controller for controlling the hot standby connection transformer circuit under the condition that the alternating voltage of the hot standby connection transformer circuit is a rated value, namely the control mode under the normal working condition of the hot standby connection transformer circuit; the ac voltage controller control mode is a control mode in which the ac voltage of the hot standby link transformer circuit can be adjusted by adjusting elements within the ac voltage controller. When another group of hot standby connection transformers of the hot standby connection transformer circuit is put into use, the control mode in the flexible direct current converter valve is switched from the reactive power controller control mode to the alternating voltage controller control mode through the control system, and then the alternating voltage of the hot standby connection transformer circuit can be adjusted.
Adjusting an alternating voltage controller through a control system, and reducing the alternating voltage of the hot standby connection transformer circuit to a preset value;
the alternating voltage of the hot standby connection transformer circuit is adjusted by controlling the access number of elements in the alternating voltage controller through a control system, and the alternating voltage can be adjusted in a mode of increasing the alternating voltage or decreasing the alternating voltage. The purpose of reducing the ac voltage of the hot standby link transformer circuit to a predetermined value is that, in the embodiments of the present application, by reducing the ac voltage, even if a magnetizing inrush current occurs, the generated ac voltage does not affect the safety of each device on the offshore wind power engineering converter station. The preset value is 0.3p.u. -0.5p.u., the hot standby connection transformer circuit generates excitation inrush current even when the other group of alternating current circuit breakers are switched on, namely when the other group of combined transformers are put into the hot standby connection transformer circuit, the maximum alternating current value of the multiple increase can only reach 1p.u., and the safety of each device on the offshore wind power engineering converter station cannot be influenced.
And controlling another group of alternating current circuit breakers to complete switching on through a control system, and realizing the input of a hot standby connecting transformer of the hot standby connecting transformer circuit.
The control of the switching-on process of the other group of the alternating current circuit breakers through the control system comprises the following steps:
detecting the alternating voltage of the hot standby connection transformer circuit through a control system to obtain the alternating voltage of the hot standby connection transformer circuit;
judging whether the alternating voltage of the hot standby connection transformer circuit is reduced to a preset value;
when the alternating current voltage of the hot standby connection transformer circuit is reduced to a preset value, the control system sends a closing instruction to the other group of alternating current circuit breakers after delay time;
and according to the closing instruction, the other group of the alternating current circuit breakers complete closing.
The delay time is 50ms, and the purpose of setting the delay time is mainly to ensure that the alternating voltage reduced to a preset value is stable, and avoid the situation that the alternating voltage after excitation surge current occurs to influence the equipment safety due to switching on under the condition that the alternating voltage of the hot standby connection transformer circuit is not stable yet.
And when the interval of 50ms is detected after the alternating voltage of the hot standby connection transformer circuit reaches a preset value, the control system issues another group of switching-on instructions of the alternating current circuit breaker, and the circuit breaker executes switching-on operation after receiving the instructions. The circuit breaker comprises an alternating current side circuit breaker and a valve side circuit breaker, the closing instruction is issued to the alternating current side circuit breaker and the valve side circuit breaker simultaneously, three phases are closed simultaneously, and a phase selection closing device or a closing resistor is not needed. And issuing a closing instruction of the connecting transformer circuit breaker at preset time intervals after detecting that the alternating voltage of the hot standby connecting transformer circuit reaches a preset value, wherein the delay time is also a numerical value which can be regulated and controlled according to the actual requirement.
The embodiment adopts a connection transformer input method for a hot standby connection transformer circuit to solve the technical problem of excitation inrush current caused by the switching deviation of a phase selection switching-on device, and meanwhile, the hot standby connection transformer circuit is not required to be protected by installing a switching-on resistor, so that the problems of cost increase, construction difficulty and the like caused by adding equipment on an offshore platform are solved.
Wherein, control another group through control system the alternating current circuit breaker accomplishes the combined floodgate, still include after realizing the input of hot reserve coupling transformer to hot reserve coupling transformer circuit:
regulating an AC voltage controller by the control system to raise the AC voltage of the hot standby coupling transformer circuit to a nominal value; the ac voltage is increased, here controlled by the control system, in the same manner as described above for the hot standby link transformer circuit. The rated value is 1p.u., and the alternating voltage is controlled to the rated value under the normal working state through the control system by adjusting the alternating voltage controller.
And switching the control mode in the flexible direct current converter valve to a reactive power controller control mode through the control system.
And switching the control mode in the flexible direct current converter valve back to the reactive power controller control mode, so that the hot standby connection transformer circuit recovers to a normal operation state, namely the offshore wind power engineering converter station recovers to a normal working state.
Wherein the step of boosting the AC voltage of the hot standby coupling transformer circuit to a nominal value by the control system regulating the AC voltage controller comprises:
adjusting elements in an alternating current voltage controller through the control system to obtain a preset rate of rise of the alternating current voltage of the hot standby connection transformer circuit; the predetermined rate is 0.51p.u./s.
Increasing the AC voltage of the hot standby coupling transformer circuit to a nominal value according to a preset rate of increase of the AC voltage of the hot standby coupling transformer circuit.
The preset speed of the rise of the alternating current voltage of the hot standby connection transformer circuit can be stably and quickly reached to the rated value by setting the preset speed, and the phenomenon that the two groups of hot standby connection transformers are disconnected due to the fact that the alternating current voltage of the hot standby connection transformer circuit is in a non-rated voltage state for a long time and influences on an offshore power grid system are caused is avoided.
Wherein the sum of the time for completing the step of reducing the alternating voltage of the hot standby coupling transformer circuit to a predetermined value and the step of controlling another set of the alternating current circuit breakers to complete closing by the control system is less than time T. The time T is 0.625s, and the time T is also set to avoid the problem that the whole offshore power grid system is influenced by the disconnection of the two groups of combined transformers due to the fact that the alternating current of the hot standby connection transformer circuit for a long time is in an abnormal working state for a long time.
Embodiments of the present invention also provide a coupling transformer commissioning system for a hot standby coupling transformer circuit, comprising:
the switching module 201 is configured to switch a control mode in the flexible dc converter valve to an ac voltage controller control mode through the control system;
the adjusting module 202 is used for adjusting the alternating voltage controller through a control system, and reducing the alternating voltage of the hot standby connection transformer circuit to a preset value;
and the input module 203 is used for controlling another group of alternating current circuit breakers to complete switching on through a control system, so that the input of a hot standby connecting transformer of the hot standby connecting transformer circuit is realized.
Wherein, still include after the module of throwing:
regulating an AC voltage controller by the control system to raise the AC voltage of the hot standby coupling transformer circuit to a nominal value;
and switching the control mode in the flexible direct current converter valve to a reactive power controller control mode through the control system.
Wherein, control another group through control system the exchange circuit breaker switching-on process includes:
detecting the alternating voltage of the hot standby connection transformer circuit through a control system to obtain the alternating voltage of the hot standby connection transformer circuit;
judging whether the alternating voltage of the hot standby connection transformer circuit is reduced to a preset value;
when the alternating current voltage of the hot standby connection transformer circuit is reduced to a preset value, the control system sends a closing instruction to the other group of alternating current circuit breakers after delay time;
and according to the closing instruction, the other group of the alternating current circuit breakers complete closing.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Embodiments of the present invention further provide a coupling transformer commissioning device for a hot standby coupling transformer circuit,
the apparatus comprises a processor 300 and a memory 301;
the memory 301 is configured to store a program code 302 and transmit the program code 302 to the processor;
the processor 300 is configured to perform the steps of a method for commissioning a connection transformer for a hot standby connection transformer circuit as described above according to instructions in the program code 302.
Illustratively, the computer program 302 may be partitioned into one or more modules/units that are stored in the memory 301 and executed by the processor 300 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 302 in the terminal device 30.
The terminal device 30 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 300, a memory 301. Those skilled in the art will appreciate that fig. 4 is merely an example of a terminal device 30 and does not constitute a limitation of terminal device 30 and may include more or fewer components than shown, or some components may be combined, or different components, e.g., the terminal device may also include input-output devices, network access devices, buses, etc.
The Processor 300 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf ProgrammaBle gate array (FPGA) or other ProgrammaBle logic device, discrete gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 301 may be an internal storage unit of the terminal device 30, such as a hard disk or a memory of the terminal device 30. The memory 301 may also be an external storage device of the terminal device 30, such as a plug-in hard disk, a Smart Memory Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, provided on the terminal device 30. Further, the memory 301 may also include both an internal storage unit and an external storage device of the terminal device 30. The memory 301 is used for storing the computer program and other programs and data required by the terminal device. The memory 301 may also be used to temporarily store data that has been output or is to be output.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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 technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for inputting a connecting transformer for a hot standby connecting transformer circuit is characterized in that the hot standby connecting transformer circuit comprises a flexible direct current converter valve, a control system, two groups of connecting transformers and two groups of alternating current circuit breakers, wherein each group of alternating current circuit breakers are respectively connected with one group of connecting transformers in series, the two groups of connecting transformers are connected in parallel, the flexible direct current converter valve is connected in series on a parallel circuit of the two groups of connecting transformers, the control system controls the flexible direct current converter valve and the two groups of alternating current circuit breakers, one group of alternating current circuit breakers are in a closing state, and the method comprises the following steps:
switching a control mode in the flexible direct current converter valve to an alternating current voltage controller control mode through a control system;
adjusting an alternating voltage controller through a control system, and reducing the alternating voltage of the hot standby connection transformer circuit to a preset value;
the control system controls the other group of alternating current circuit breakers to complete switching on, so that the input of a hot standby connecting transformer circuit is realized, and the switching-on process of the other group of alternating current circuit breakers controlled by the control system comprises the following steps:
detecting the alternating voltage of the hot standby connection transformer circuit through a control system to obtain the alternating voltage of the hot standby connection transformer circuit;
judging whether the alternating voltage of the hot standby connection transformer circuit is reduced to a preset value;
when the alternating current voltage of the hot standby connection transformer circuit is reduced to a preset value, the control system sends a closing instruction to the other group of alternating current circuit breakers after delay time;
according to the switching-on instruction, the other group of alternating current circuit breakers complete switching-on;
the control system controls another group of alternating current circuit breakers to complete switching on, and the method also comprises the following steps after the hot standby connection transformer of the hot standby connection transformer circuit is put into operation:
regulating an AC voltage controller by the control system to raise the AC voltage of the hot standby coupling transformer circuit to a nominal value;
and switching the control mode in the flexible direct current converter valve to a reactive power controller control mode through the control system.
2. A method of commissioning a connection transformer for a hot standby connection transformer circuit according to claim 1, wherein said step of boosting said ac voltage of said hot standby connection transformer circuit to a nominal value by regulating said ac voltage controller by said control system comprises:
adjusting elements in an alternating current voltage controller through the control system to obtain a preset rate of rise of the alternating current voltage of the hot standby coupling transformer circuit;
increasing the AC voltage of the hot standby coupling transformer circuit to a nominal value according to a preset rate of increase of the AC voltage of the hot standby coupling transformer circuit.
3. A method according to claim 2, wherein the sum of the time taken to complete said step of reducing the ac voltage of said hot standby link transformer circuit to a predetermined value and the time taken to complete said step of closing another set of said ac breakers by the control system is less than T.
4. A method of commissioning a connection transformer for a hot standby connection transformer circuit according to claim 3 wherein said predetermined value is 0.3p.u. -0.5p.u.; the rated value is 1p.u., the delay time is 50ms, the preset rate is 0.51p.u./s, and the time T is 0.625s.
5. A coupling transformer switching system for a hot standby coupling transformer circuit, the hot standby coupling transformer circuit including two sets of ac circuit breakers, one of the sets of ac circuit breakers being in a closed state, comprising:
the switching module is used for switching the control mode in the flexible direct current converter valve through the control system to the control mode of the alternating current voltage controller;
the adjusting module is used for adjusting the alternating voltage controller through a control system and reducing the alternating voltage of the hot standby connection transformer circuit to a preset value;
the input module is used for controlling another group of alternating current circuit breakers to complete switching on through a control system so as to realize the input of a hot standby connecting transformer circuit;
the input module further comprises the following components:
regulating an AC voltage controller by the control system to raise the AC voltage of the hot standby coupling transformer circuit to a nominal value;
and switching the control mode in the flexible direct current converter valve to a reactive power controller control mode through the control system.
6. The system of claim 5, wherein controlling the closing process of another set of said ac circuit breakers by a control system comprises:
detecting the alternating voltage of the hot standby connection transformer circuit through a control system to obtain the alternating voltage of the hot standby connection transformer circuit;
judging whether the alternating voltage of the hot standby connection transformer circuit is reduced to a preset value;
when the alternating-current voltage of the hot standby connection transformer circuit is reduced to a preset value, the control system sends a closing instruction to the other group of alternating-current circuit breakers after delay time;
and according to the closing instruction, the other group of the alternating current circuit breakers complete closing.
7. A coupling transformer throw-in device for a hot standby coupling transformer circuit, comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute a method of commissioning a connection transformer for a hot standby connection transformer circuit according to any one of claims 1-4 in accordance with instructions in the program code.
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| CN116435981A (en) * | 2021-12-30 | 2023-07-14 | 北京金风零碳能源有限公司 | Control method and device of power type energy storage device |
| CN115378021B (en) * | 2022-10-25 | 2023-01-24 | 国网经济技术研究院有限公司 | Offshore flexible-straight main wiring system and starting method thereof |
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| CN102255338A (en) * | 2011-08-19 | 2011-11-23 | 青岛特锐德电气股份有限公司 | Transformer automatic switching device for power transmission system |
| CN102403694A (en) * | 2011-09-21 | 2012-04-04 | 山东大学 | Transformer protection method and protection device with exciting inrush current restrain and switch parameter detection |
| CN104242240A (en) * | 2014-09-28 | 2014-12-24 | 哈尔滨帕特尔科技股份有限公司 | No-load closing inrush current and overvoltage suppression unit of ultrahigh-voltage transformer |
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