CN203942470U - The startup control circuit of a kind of pumped storage unit SFC - Google Patents
The startup control circuit of a kind of pumped storage unit SFC Download PDFInfo
- Publication number
- CN203942470U CN203942470U CN201420311200.4U CN201420311200U CN203942470U CN 203942470 U CN203942470 U CN 203942470U CN 201420311200 U CN201420311200 U CN 201420311200U CN 203942470 U CN203942470 U CN 203942470U
- Authority
- CN
- China
- Prior art keywords
- sfc
- storage unit
- pumped storage
- electrically connected
- control system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model discloses the startup control circuit of a kind of pumped storage unit SFC, the circuit structure of this startup control circuit is simple, the whole process that SFC starts pumped storage unit is also comparatively simple, therefore control flow is also comparatively simple, in the time there is burst accident, is easy to handle it quickly.Comprise: pumped storage unit, LCU5, SFC, excitation system and supervisory control system; SFC is electrically connected with LCU5, pumped storage unit is electrically connected with LCU5, SFC is electrically connected with pumped storage unit, SFC is electrically connected with excitation system, SFC is electrically connected with supervisory control system, and excitation system is electrically connected with supervisory control system, and LCU5 is electrically connected with supervisory control system, pumped storage unit is electrically connected with supervisory control system, and pumped storage unit is electrically connected with excitation system.The utility model is mainly used in pumped storage Unit Starting Technology.
Description
Technical field
The utility model relates to pumped storage Unit Starting Technology field, relates in particular to the startup control circuit of a kind of pumped storage unit SFC.
Background technology
The modes such as existing hydroenergy storage station is general to be adopted back-to-back, total head or step-down drag the startup of pumped storage unit.Total head and reduced-voltage starting mode are units direct (total head) or are connected to the grid through impedance or transformer (half presses), total head and reduced-voltage starting mode are applicable to the unit of Small And Medium Capacity, if unit capacity is large, the impact of Parallel Operation on Power System and unit self is all larger.The circuit structure of Starting mode is comparatively complicated back-to-back, makes sequence control process also comparatively complicated, handles it quickly if more difficult while there is burst accident.If unit capacity is large, must take to reduce " soft " Starting mode of impacting, at present the most frequently used is to adopt SFC (being static startup frequency converter) to start jumbo pumped storage unit, but SFC starts the control procedure more complicated of large capacity pumped storage unit at present, handle it quickly if more difficult while there is burst accident.
Utility model content
The utility model is the control procedure more complicated that starts large capacity pumped storage unit in order to solve existing SFC, there is the more difficult deficiency of handling it fast in time of burst accident, the startup control circuit of a kind of pumped storage unit SFC is provided, the circuit structure of this startup control circuit is simple, the whole process that SFC starts pumped storage unit is also comparatively simple, therefore control flow is also comparatively simple, in the time there is burst accident, is easy to handle it quickly.
To achieve these goals, the utility model is by the following technical solutions:
A startup control circuit of pumped storage unit SFC, comprising: pumped storage unit, LCU5, SFC, excitation system and supervisory control system; SFC is electrically connected with LCU5, pumped storage unit is electrically connected with LCU5, SFC is electrically connected with pumped storage unit, SFC is electrically connected with excitation system, SFC is electrically connected with supervisory control system, and excitation system is electrically connected with supervisory control system, and LCU5 is electrically connected with supervisory control system, pumped storage unit is electrically connected with supervisory control system, and pumped storage unit is electrically connected with excitation system.
In this programme, SFC is static startup frequency converter, and LCU5 is local control unit.The circuit structure that this programme starts control circuit is simple, and the whole process that SFC starts pumped storage unit is also comparatively simple, and therefore control flow is also comparatively simple, in the time there is burst accident, is easy to handle it quickly.The startup control circuit that this programme starts control circuit is:
(1) instruction of sending startup by supervisory control system to the auxiliary equipment of pumped storage unit starts the auxiliary equipment of pumped storage unit, and the auxiliary equipment of described pumped storage unit comprises: the oil tray oil extraction mist pump of high pressure oiling pump, supply-water pump and the conduction bearing of thrust bearing;
(2) send and close cutter instruction to the commutation cutter of pumped storage unit by supervisory control system, commutation cutter is closed in the motor direction of pumped storage unit; Send exit instruction by supervisory control system to the mechanical brake of pumped storage unit, allow pumped storage unit mechanical brake exit; Send reclosing command by supervisory control system to the bus plug-in strip of LCU5, bus plug-in strip is closed;
(3) send SFC by supervisory control system to LCU5 and start the instruction of preparing, jointly complete the preparation before pumped storage unit is started by SFC by LCU5 and SFC, the preparation before described pumped storage unit starting comprises:
(3.1) input of opening SFC by LCU5 becomes, output becomes and the cooling water valve with electrically motorized operation of power cabinet;
(3.2) send the instruction that powers on to SFC by LCU5, the control logic of the SFC harmonic filter switch of SFC that can automatically close, and start the auxiliary equipment of SFC; The auxiliary equipment of described SFC comprises: input and output become oil pump, deionization water pump, cooling fan and external refrigeration water valve with electrically motorized operation; After the auxiliary equipment of SFC starts, the auxiliary equipment that SFC sends SFC to LCU5 starts successful signal;
(3.3) which input switch what SFC request LCU5 judged according to the operation conditions of the main transformer of hydroenergy storage station that SFC closes is, after input switch closes, SFC has just entered hot stand-by duty;
(3.4) SFC sends the instruction of closing SFC output switch to LCU5, then sends SFC by LCU5 to pumped storage unit and starts the signal being ready to complete;
(4)) send the instruction of closing to the plug-in strip that dragged of pumped storage unit by supervisory control system, allow the plug-in strip that dragged of pumped storage unit close, and open the labyrinth ring cooling water valve of pumped storage unit;
(5) issue an order and make excitation system enter SFC start-up mode to excitation system by supervisory control system, excitation system automatically performs the logic of described SFC start-up mode, and close excitation low pressure side switch and field suppression switch, excitation system is switched to permanent exciting current and regulates working method, permanent exciting current set point is become to SFC and start required exciting current value, then send to pumped storage unit the signal that excitation is ready to complete simultaneously;
(6) pumped storage unit sends to SFC the instruction that SFC starts, SFC sends order for discharge to excitation system after receiving the instruction that SFC that SFC sends starts immediately, now excitation system starts, add exciting current to pumped storage unit, send the feedback signal that excitation mode has discharged to SFC simultaneously, SFC measures the initial position of the rotor of pumped storage unit after receiving this feedback signal immediately, and then pumped storage unit is dragged;
(7) when pumped storage generating unit speed be greater than the specified running speed of pumped storage unit 10% time, start pumped storage unit phase modulation setting-out control logic, runner chamber water level is forced down with gases at high pressure, pumped storage unit is rotated in air, alleviate the startup load of SFC;
(8) when pumped storage generating unit speed is greater than 90% of the specified running speed of pumped storage unit, and the voltage of pumped storage unit be greater than pumped storage unit rating operating voltage 90% time, make pumped storage unit enter automatic presynchronization running status; Pumped storage unit sends phase modulation operation instruction to speed regulator simultaneously, after being closed, the gate out switch of pumped storage unit enters the working conditions of phrase modulation running status of drawing water, pumped storage unit is by SFC enabled instruction involution, SFC, by tripping output switch after locking output current, allows SFC turn back to hot stand-by duty; Transfer cold standby state to if set before starting after SFC starts pumped storage unit, the SFC LCU5 tripping input switch of issuing an order, and time delay stops the auxiliary equipment of SFC, closes external refrigeration water valve with electrically motorized operation;
(9) by supervisory control system to LCU5 issue an order pull open pumped storage unit dragged plug-in strip, sent the instruction that works in idle adjusting pattern to excitation system by supervisory control system, and issue an order and pull open the instruction that starts bus plug-in strip to LCU5, so far complete the whole process of SFC startup pumped storage unit.
As preferably, also comprise input switch, output switch and driving bus, SFC and supervisory control system are electrically connected with input switch respectively, and output switch is electrically connected with SFC, drives bus to be electrically connected with output switch.Sort circuit is simple in structure, and the whole process that SFC starts pumped storage unit is also comparatively simple, and therefore control flow is also comparatively simple, in the time there is burst accident, is easy to handle it quickly.
As preferably, also comprise filter, input switch and supervisory control system are electrically connected with filter respectively.Filter is current quick-breaking and the overcurrent protection of each harmonic filtering, and stability is high.
As preferably, SFC comprises: input change, bridge, direct current reactor, machine bridge, isolation switch and output become, input switch, bridge are connected with input power transformation respectively, machine bridge and bridge are electrically connected with direct current reactor respectively, machine bridge and output switch are electrically connected with isolation switch respectively, and input change, bridge, direct current reactor, machine bridge, isolation switch and output variation are not electrically connected with supervisory control system.Sort circuit structure, annexation is simple, makes the whole process of SFC startup pumped storage unit also comparatively simple, and therefore control flow is also comparatively simple, in the time there is burst accident, is easy to handle it quickly.
The utility model can reach following effect:
1, the circuit structure of this programme startup control circuit is simple, and the whole process that SFC starts pumped storage unit is also comparatively simple, and therefore control flow is also comparatively simple, in the time there is burst accident, is easy to handle it quickly.
2, the circuit structure of this programme is simple, makes the circuit safety of this scheme high, and reliability is strong, protective good.
Brief description of the drawings
Fig. 1 is a kind of circuit theory syndeton schematic block diagram of the present utility model.
Fig. 2 is the external interface schematic diagram of SFC of the present utility model.
Fig. 3 is the schematic diagram that connects each other of SFC of the present utility model, supervisory control system, excitation system.
Fig. 4 is a kind of circuit theory syndeton schematic block diagram of the utility model SFC, input switch, filter, driving bus and supervisory control system.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment mono-: the startup control circuit of a kind of pumped storage unit SFC of the present embodiment, as shown in Figure 1, comprising: pumped storage unit (100), LCU5 (200), SFC (300), excitation system (400) and supervisory control system (500); SFC is electrically connected with LCU5, pumped storage unit is electrically connected with LCU5, SFC is electrically connected with pumped storage unit, SFC is electrically connected with excitation system, SFC is electrically connected with supervisory control system, and excitation system is electrically connected with supervisory control system, and LCU5 is electrically connected with supervisory control system, pumped storage unit is electrically connected with supervisory control system, and pumped storage unit is electrically connected with excitation system.Shown in Figure 4, also comprise input switch (11), output switch (17) and drive bus (18), SFC and supervisory control system are electrically connected with input switch respectively, and output switch is electrically connected with SFC, drive bus to be electrically connected with output switch.Also comprise filter (19), input switch and supervisory control system are electrically connected with filter respectively.SFC comprises: input becomes (12), bridge (13), direct current reactor (14), machine bridge (15), isolation switch (16) and output and becomes (20), input switch, bridge are connected with input power transformation respectively, machine bridge and bridge are electrically connected with direct current reactor respectively, machine bridge and output switch are electrically connected with isolation switch respectively, and input change, bridge, direct current reactor, machine bridge, isolation switch and output variation are not electrically connected with supervisory control system.
Shown in Figure 3, the startup control method of this startup control circuit comprises the steps:
(1) instruction of sending startup by supervisory control system to the auxiliary equipment of pumped storage unit starts the auxiliary equipment of pumped storage unit, and the auxiliary equipment of described pumped storage unit comprises: the oil tray oil extraction mist pump of high pressure oiling pump, supply-water pump and the conduction bearing of thrust bearing;
(2) send and close cutter instruction to the commutation cutter of pumped storage unit by supervisory control system, commutation cutter is closed in the motor direction of pumped storage unit; Send exit instruction by supervisory control system to the mechanical brake of pumped storage unit, allow pumped storage unit mechanical brake exit; Send reclosing command by supervisory control system to the bus plug-in strip of LCU5, bus plug-in strip is closed;
(3) send SFC by supervisory control system to LCU5 and start the instruction of preparing, jointly complete the preparation before pumped storage unit is started by SFC by LCU5 and SFC, the preparation before described pumped storage unit starting comprises:
(3.1) input of opening SFC by LCU5 becomes, output becomes and the cooling water valve with electrically motorized operation of power cabinet;
(3.2) send the instruction that powers on to SFC by LCU5, the control logic of the SFC harmonic filter switch of SFC that can automatically close, and start the auxiliary equipment of SFC; The auxiliary equipment of described SFC comprises: input and output become oil pump, deionization water pump, cooling fan and external refrigeration water valve with electrically motorized operation; After the auxiliary equipment of SFC starts, the auxiliary equipment that SFC sends SFC to LCU5 starts successful signal;
(3.3) which input switch what SFC request LCU5 judged according to the operation conditions of the main transformer of hydroenergy storage station that SFC closes is, after input switch closes, SFC has just entered hot stand-by duty;
(3.4) SFC sends the instruction of closing SFC output switch to LCU5, then sends SFC by LCU5 to pumped storage unit and starts the signal being ready to complete;
(4)) send the instruction of closing to the plug-in strip that dragged of pumped storage unit by supervisory control system, allow the plug-in strip that dragged of pumped storage unit close, and open the labyrinth ring cooling water valve of pumped storage unit;
(5) issue an order and make excitation system enter SFC start-up mode to excitation system by supervisory control system, excitation system automatically performs the logic of described SFC start-up mode, and close excitation low pressure side switch and field suppression switch, excitation system is switched to permanent exciting current and regulates working method, permanent exciting current set point is become to SFC and start required exciting current value, then send to pumped storage unit the signal that excitation is ready to complete simultaneously;
(6) pumped storage unit sends to SFC the instruction that SFC starts, SFC sends order for discharge to excitation system after receiving the instruction that SFC that SFC sends starts immediately, now excitation system starts, add exciting current to pumped storage unit, send the feedback signal that excitation mode has discharged to SFC simultaneously, SFC measures the initial position of the rotor of pumped storage unit after receiving this feedback signal immediately, and then pumped storage unit is dragged.If pumped storage generating unit speed after 40 seconds, be still less than the specified running speed of pumped storage unit 1% time, allow pumped storage unit send chaser instruction, stop SFC dragging pumped storage unit.Sent the instruction powering on to SFC by LCU5, when SFC receives powering on after instruction that LCU5 sends, pumped storage unit just enters auxiliary equipment starting process and set-up procedure stage; After auxiliary equipment starting process and set-up procedure finish, SFC is just in hot stand-by duty; When SFC receives after the SFC action command that the pumped storage unit that is activated sends, send excitation by SFC and release order, request excitation system adds exciting current; While receiving the signal that the exciting current of excitation system added, SFC enters the start-up course stage, starts to measure initial position of rotor, and slowly drags pumped storage unit and rotate.
(7) when pumped storage generating unit speed be greater than the specified running speed of pumped storage unit 10% time, start pumped storage unit phase modulation setting-out control logic, runner chamber water level is forced down with gases at high pressure, pumped storage unit is rotated in air, alleviate the startup load of SFC;
(8) when pumped storage generating unit speed is greater than 90% of the specified running speed of pumped storage unit, and the voltage of pumped storage unit be greater than pumped storage unit rating operating voltage 90% time, make pumped storage unit enter automatic presynchronization running status; Pumped storage unit sends phase modulation operation instruction to speed regulator simultaneously, after being closed, the gate out switch of pumped storage unit enters the working conditions of phrase modulation running status of drawing water, pumped storage unit is by SFC enabled instruction involution, SFC, by tripping output switch after locking output current, allows SFC turn back to hot stand-by duty; Transfer cold standby state to if set before starting after SFC starts pumped storage unit, the SFC LCU5 tripping input switch of issuing an order, and time delay stops the auxiliary equipment of SFC, closes external refrigeration water valve with electrically motorized operation.SFC starts pumped storage unit and is divided into low cruise stage and high-speed cruising stage, and pumped storage unit is produced reposefully from zero variable frequency power supply to rated frequency value, synchronously drags pumped storage unit and enters the working conditions of phrase modulation that draws water; The 5Hz tachometer signal being produced by pumping energy storage machine unit speed regulating device is realized the switching in pumped storage unit low cruise stage and these two stages in high-speed cruising stage, in the time that pumped storage generating unit speed is less than 5Hz, SFC works in the pulse-couple stage, and in the time that pumped storage generating unit speed is greater than 5Hz, SFC works in the synchronous operation stage; When pumped storage generating unit speed be greater than the specified running speed of pumped storage unit 90% time, started the synchronous device of pumped storage unit by supervisory control system, SFC enters the same period and regulates mode phases, the frequency increase and decrease signal that the synchronous device of SFC reception pumped storage unit is sent, regulates pumped storage generating unit speed until grid-connected by SFC; When SFC receives after the signal of pumped storage unit switch closing position contact or closing relay contact, SFC is locking output current, then SFC tripping output switch, and SFC enters hot stand-by duty, now can continue to start an other pumped storage unit; If do not need to start an other pumped storage unit, LCU5 issues an order and continues keep hot stand-by duty or enter cold standby state to SFC according to operator's requirement.
(9) by supervisory control system to LCU5 issue an order pull open pumped storage unit dragged plug-in strip, sent the instruction that works in idle adjusting pattern to excitation system by supervisory control system, and issue an order and pull open the instruction that starts bus plug-in strip to LCU5, so far complete the whole process of SFC startup pumped storage unit.
As shown in Figure 2, if pumped storage unit has four generators, the port for stopping SFC that wherein the generator contactor closing position contact of 1～No. 4 machine or closing relay contact are sent into end with SFC device outside is respectively connected.The interface end that the SFC action command that 1～No. 4 machine sends and exciting current have added the interface end of signal and the upper cable order of SFC that LCU5 sends respectively with for starting SFC, the port that stops SFC in the time that arbitrary order is lost connects.The corresponding interface that the divide-shut brake position contact of the interface end of rotating speed that the synchronous device of 4 machines sends increase and decrease order and SFC input, output switch is sent into end with SFC device outside is respectively connected.The port for the working stage that switches SFC that end is sent in the interface end that the machine class frequency of pumped storage unit is greater than or less than 5Hz signal and SFC device outside is connected.1～No. 4 machine excitation order for discharge interface that the SFC of SFC device sends on end is connected with the excitation end of 1～No. 4 machine of pumped storage unit respectively.Send the interface that is provided with 1～No. 4 machine excitation order for discharge on end at the SFC of SFC device, the interface that SFC can use, the ready interface of SFC, the interface that SFC reports to the police, the interface of SFC tripping operation, the interface of input switch combined floodgate order, the interface of input switch separating brake order, the interface of output switch combined floodgate order, the interface of output switch separating brake order.These interfaces connect with interface corresponding on pumped storage unit respectively.
The circuit structure that the present embodiment starts control circuit is simple, and the whole process that SFC starts pumped storage unit is also comparatively simple, and therefore control flow is also comparatively simple, in the time there is burst accident, is easy to handle it quickly.The circuit structure of this embodiment is simple, makes the circuit safety of this scheme high, and reliability is strong, protective good.
Described by reference to the accompanying drawings execution mode of the present utility model above, but not limited by above-described embodiment while realizing, those of ordinary skill in the art can make a variety of changes within the scope of the appended claims or revise.
Claims (4)
1. a startup control circuit of pumped storage unit SFC, is characterized in that, comprising: pumped storage unit, LCU5, SFC, excitation system and supervisory control system; SFC is electrically connected with LCU5, pumped storage unit is electrically connected with LCU5, SFC is electrically connected with pumped storage unit, SFC is electrically connected with excitation system, SFC is electrically connected with supervisory control system, and excitation system is electrically connected with supervisory control system, and LCU5 is electrically connected with supervisory control system, pumped storage unit is electrically connected with supervisory control system, and pumped storage unit is electrically connected with excitation system.
2. the startup control circuit of a kind of pumped storage unit SFC according to claim 1, it is characterized in that, also comprise input switch, output switch and driving bus, SFC and supervisory control system are electrically connected with input switch respectively, output switch is electrically connected with SFC, drives bus to be electrically connected with output switch.
3. the startup control circuit of a kind of pumped storage unit SFC according to claim 2, is characterized in that, also comprises filter, and input switch and supervisory control system are electrically connected with filter respectively.
4. the startup control circuit of a kind of pumped storage unit SFC according to claim 2, it is characterized in that, SFC comprises: input change, bridge, direct current reactor, machine bridge, isolation switch and output become, input switch, bridge are connected with input power transformation respectively, machine bridge and bridge are electrically connected with direct current reactor respectively, machine bridge and output switch are electrically connected with isolation switch respectively, and input change, bridge, direct current reactor, machine bridge, isolation switch and output variation are not electrically connected with supervisory control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420311200.4U CN203942470U (en) | 2014-06-12 | 2014-06-12 | The startup control circuit of a kind of pumped storage unit SFC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420311200.4U CN203942470U (en) | 2014-06-12 | 2014-06-12 | The startup control circuit of a kind of pumped storage unit SFC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203942470U true CN203942470U (en) | 2014-11-12 |
Family
ID=51861755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420311200.4U Expired - Fee Related CN203942470U (en) | 2014-06-12 | 2014-06-12 | The startup control circuit of a kind of pumped storage unit SFC |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203942470U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026809A (en) * | 2016-05-12 | 2016-10-12 | 国家电网公司 | Pumped storage power station excitation system black start control circuit and control method thereof |
| CN106026810A (en) * | 2016-05-12 | 2016-10-12 | 国家电网公司 | Black start control system and method for excitation system of pumped storage power station |
| CN106026811A (en) * | 2016-05-12 | 2016-10-12 | 国家电网公司 | Black start control system and method for excitation system of pumped storage power station |
-
2014
- 2014-06-12 CN CN201420311200.4U patent/CN203942470U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026809A (en) * | 2016-05-12 | 2016-10-12 | 国家电网公司 | Pumped storage power station excitation system black start control circuit and control method thereof |
| CN106026810A (en) * | 2016-05-12 | 2016-10-12 | 国家电网公司 | Black start control system and method for excitation system of pumped storage power station |
| CN106026811A (en) * | 2016-05-12 | 2016-10-12 | 国家电网公司 | Black start control system and method for excitation system of pumped storage power station |
| CN106026811B (en) * | 2016-05-12 | 2018-06-26 | 国家电网公司 | Excitation System on Pumped Storage Power Stations black starting-up control device and its control method |
| CN106026809B (en) * | 2016-05-12 | 2018-06-26 | 国家电网公司 | Excitation System on Pumped Storage Power Stations black starting-up control loop and its control method |
| CN106026810B (en) * | 2016-05-12 | 2018-06-26 | 国家电网公司 | Excitation System on Pumped Storage Power Stations black starting-up control system and its control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104155883B (en) | A kind of startup control method of pump-storage generator SFC | |
| CN106602962B (en) | Work converting operation method for synchronously switching based on high-voltage frequency converter electric machine control system | |
| CN104612891B (en) | Emergent switchover starting control method from water pumping to power generation of pump storage group | |
| CN204244113U (en) | A kind of control circuit of soft initiator | |
| CN105689160B (en) | A kind of closing method and device for magnetic suspension centrifuge | |
| CN102570934B (en) | Start control method for working condition excitation system of static frequency converter of pumped-storage aggregate set | |
| CN106685271B (en) | The operating status control method of brushless dual-feed motor | |
| CN203942470U (en) | The startup control circuit of a kind of pumped storage unit SFC | |
| CN107979096A (en) | A kind of excitation control method during large-scale phase modifier startup is grid-connected | |
| CN100525068C (en) | Method for driving synchronous machine to operation using power source type frequency converter | |
| CN102882441B (en) | A kind of threephase asynchronous electric brake arrangement and control method thereof | |
| EP3443276B1 (en) | Compressor unit, refrigeration circuit comprising the same and method of operating a compressor unit | |
| CN113098039B (en) | Kinetic energy recovery system and method based on flywheel energy storage variable-speed pumped storage unit | |
| CN103825509A (en) | Device applied to startup and operation of high-power motors | |
| CN203590094U (en) | Control system by soft starter for start-up of four motors | |
| CN203617935U (en) | Overload starting control device for low-power motor | |
| CN214154366U (en) | Electromagnetic soft start control circuit and device for low-voltage high-power motor | |
| CN202550961U (en) | Frequency conversion energy-saving device of low-voltage three-phase asynchronous motor control system | |
| CN108105024B (en) | SFC starting control method | |
| CN107707175A (en) | A kind of dead electricity of electric drive compressor crosses over control system and method | |
| CN112910343B (en) | Bidirectional excitation loop of synchronous generator and synchronous generator set | |
| CN209375506U (en) | A kind of generator soft starting device avoiding secondary pulse electric current | |
| CN102420564B (en) | Intelligent bypass system for high-voltage frequency converter | |
| CN209088843U (en) | A kind of generator soft starting device | |
| CN216086519U (en) | Production system recovery device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141112 |