CN109450081B - Remote shutdown control system and control method for uninterruptible power supply - Google Patents
Remote shutdown control system and control method for uninterruptible power supply Download PDFInfo
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- CN109450081B CN109450081B CN201811631042.XA CN201811631042A CN109450081B CN 109450081 B CN109450081 B CN 109450081B CN 201811631042 A CN201811631042 A CN 201811631042A CN 109450081 B CN109450081 B CN 109450081B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000013461 design Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 description 7
- 238000010248 power generation Methods 0.000 description 5
- 230000001960 triggered effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
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Classifications
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention provides a remote shutdown control system and a control method of an uninterruptible power supply, which can effectively control the uninterruptible power supply to execute remote shutdown under the condition that the power of the uninterruptible power supply reaches the preset power-off duration or the electric quantity of the uninterruptible power supply is smaller than the preset electric quantity limit value in the power-off state of the mains supply through the circuit structure design of a power supply control branch circuit, a remote shutdown enabling branch circuit and a shutdown triggering branch circuit, reduce the risk of damage of the uninterruptible power supply caused by deep discharge of a built-in battery of the uninterruptible power supply, realize over discharge protection control on the operation of the uninterruptible power supply in a wind turbine generator, and not trigger the remote shutdown operation of the uninterruptible power supply even if a remote shutdown enabling signal output end of a main controller sends a low-level signal due to misoperation under the condition that the uninterruptible power supply works normally and the mains supply is not powered off.
Description
Technical Field
The invention relates to the technical field of control of wind power generation systems, in particular to a remote shutdown control system and a control method of an uninterruptible power supply.
Background
As wind power generation technology is becoming mature, wind power generation sets (generally abbreviated as wind power generation sets) are widely arranged and operated in many areas of China. In areas with different climates, the environments facing the wind turbine generator system are different, and different temperature and humidity environments can cause different effects on the normal operation of the wind turbine generator system, wherein a control system of the wind turbine generator system is extremely damaged at a lower temperature.
The control system of the wind turbine mainly comprises a main control cabinet, a cabin cabinet, a variable pitch cabinet, a variable flow cabinet and the like, which are commonly called as control cabinets, and the main components of the control cabinet are electric, microelectronic and power electronic elements, so that the requirements on temperature and operation conditions are high. For example, an uninterruptible power supply (Uninterruptible Power Supply, abbreviated as UPS) in the control cabinet is powered by a 230VAC mains supply and converted into a 24VDC dc power supply to supply power to electronic components serving as loads, so that the quality of the power of the loads can be ensured during normal operation, and a wind turbine generator set can be smoothly shut down and data can be stored during power failure of the mains supply; in addition, when the power grid has low voltage crossing, the UPS can be instantaneously converted into a battery working mode to supply power for the carried load through the internal battery, so that the carried load can be ensured to smoothly pass through a low voltage crossing time band. Therefore, the stability of the operation of the uninterruptible power supply UPS is particularly important for wind power generation sets. However, if the power is off due to the failure of the mains supply, maintenance and the like, the UPS is converted into a battery working mode to supply power to the load through the internal battery thereof, but if the power is off for too long, the power consumption of the UPS causes too low residual power, the power supply is continued to work, which may cause damage due to deep discharge of the internal battery of the UPS, and adverse effects on the operation stability of the UPS are also caused.
Therefore, the design of the measure for providing the overdischarge protection control for the operation of the uninterrupted power supply in the wind turbine generator has important significance for the stable operation of the wind turbine generator.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a remote shutdown control system of an uninterruptible power supply, which is used for providing over-discharge protection control for the operation of the uninterruptible power supply in a wind turbine.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a remote shutdown control system of an uninterruptible power supply comprises a mains supply branch connected in parallel between a first power end and a second power end of the mains supply, and is used for supplying power to the Uninterruptible Power Supply (UPS); the high-voltage end and the low-voltage end of the power supply output of the Uninterruptible Power Supply (UPS) are connected to a main controller of the wind turbine generator set and are used for supplying power to a power supply of the main controller;
the power supply control branch circuit comprises an electromagnetic control part of the multi-contact electromagnetic switching device and a first switching part of the multi-contact electromagnetic switching device which are connected in series, and a second switching part of the multi-contact electromagnetic switching device is connected in series in the mains supply branch circuit; the first switch part and the second switch part of the multi-contact electromagnetic switch device are closed and conducted after the electromagnetic control part of the multi-contact electromagnetic switch device is electrified;
the remote shutdown enabling branch circuit is connected between the remote shutdown enabling signal output end of the main controller and the low-voltage end of the uninterruptible power supply output, and the electromagnetic control part of the first electromagnetic switching device is connected to the remote shutdown enabling branch circuit; the remote shutdown enabling signal output end of the main controller outputs a low level when the power of the mains supply is cut off to reach a preset power-off duration or the electric quantity of the uninterruptible power supply is smaller than a preset electric quantity limit value in a power-off state of the mains supply, otherwise, outputs a high level;
the power-off trigger branch circuit comprises a switch part of a first electromagnetic switch device and a third switch part of a multi-contact electromagnetic switch device which are connected in series; after the electromagnetic control part of the first electromagnetic switch device is electrified, the switch part of the first electromagnetic switch device is switched from a normally-closed state to an open state; after the electromagnetic control part of the multi-contact electromagnetic switch device is electrified, the third switch part of the multi-contact electromagnetic switch device is switched from a normally-closed state to an open state; when the shutdown control end of the uninterruptible power supply is powered on, the uninterruptible power supply starts to execute shutdown operation.
In the remote shutdown control system of an uninterruptible power supply, preferably, the preset power-off duration is 2 hours.
In the remote shutdown control system of the uninterruptible power supply, preferably, the preset electric quantity limit value is 10% -20% of the rated electric quantity of the uninterruptible power supply.
In the remote shutdown control system of the uninterruptible power supply, preferably, the remote shutdown control system further comprises a temperature control branch and a starting trigger branch, wherein the temperature control branch and the starting trigger branch are connected in parallel between a first power end and a second power end of the mains supply;
the temperature control branch circuit comprises a temperature control switch and an electromagnetic control part of a single-pole double-throw electromagnetic switch device which are connected in series, and the temperature control switch is switched on when the ambient temperature is greater than or equal to a preset starting temperature;
the starting triggering branch circuit comprises an electromagnetic control part of a time-delay electromagnetic switch device which is connected in parallel between the first power supply end and the second power supply end, the time-delay triggering end of the electromagnetic control part of the time-delay electromagnetic switch device is connected to a second switch terminal of a single-pole double-throw electromagnetic switch device, the first switch terminal of the single-pole double-throw electromagnetic switch device is connected to the first power supply end of a mains supply, the third switch terminal of the single-pole double-throw electromagnetic switch device is connected between the electromagnetic control part of the multi-contact electromagnetic switch device and the first switch part of the multi-contact electromagnetic switch device in the power supply control branch circuit through the switch part of the time-delay electromagnetic switch device, and one terminal of the electromagnetic control part of the multi-contact electromagnetic switch device, which is far away from the first switch part of the multi-contact electromagnetic switch device, in the power supply control branch circuit is connected to the second power supply end of the mains supply; when the electromagnetic control part of the single-pole double-throw electromagnetic switch device is powered off, the first switch terminal and the second switch terminal of the single-pole double-throw electromagnetic switch device are conducted, and when the electromagnetic control part of the single-pole double-throw electromagnetic switch device is powered on, the first switch terminal and the third switch terminal of the single-pole double-throw electromagnetic switch device are conducted; when the delay triggering end of the electromagnetic control part of the delay electromagnetic switch device is in a power-on state, the switch part of the delay electromagnetic switch device is kept in a closed and conducting state, and when the delay triggering end of the electromagnetic control part of the delay electromagnetic switch device is changed from the power-on state to a power-off state, the switch part of the delay electromagnetic switch device is immediately opened and is closed and conducted again after the preset delay time.
In the remote shutdown control system of an uninterruptible power supply, preferably, the preset starting temperature of the temperature control switch is set to be 5 ℃.
In the remote shutdown control system of the uninterruptible power supply, preferably, the preset delay time of the delay electromagnetic switch device is 10-20 seconds.
Correspondingly, the invention also provides a remote shutdown control method of the uninterruptible power supply; for this purpose, the invention adopts the following technical scheme:
the remote shutdown control method of the uninterrupted power supply adopts the remote shutdown control system of the uninterrupted power supply to control, and the control method specifically comprises the following steps:
in the normal working process after the uninterrupted power supply is started, under the condition that the mains supply is kept powered, the electromagnetic control part of the multi-contact electromagnetic switching device is kept in a power-on state due to the fact that the power supply control branch is powered on, the third switching part of the multi-contact electromagnetic switching device is in a power-off triggering branch, meanwhile, the remote power-off enabling signal output end of the main controller outputs high level, the electromagnetic control part of the first electromagnetic switching device is powered on, and the switching part of the first electromagnetic switching device in the power-off triggering branch is also in a power-off state, so that the power-off control end of the uninterrupted power supply is in a power-off state;
when the mains supply is powered off for a preset power-off duration or the electric quantity of the uninterruptible power supply in a mains supply power-off state is smaller than a preset electric quantity limit value, the mains supply power-off causes the electromagnetic control part of the multi-contact electromagnetic switching device in the power supply control branch to lose power, the third switching part of the multi-contact electromagnetic switching device in the power-off trigger branch is switched to a normally-closed state, meanwhile, the remote power-off enabling signal output end of the main controller outputs a low level, the electromagnetic control part of the first electromagnetic switching device loses power, the switching part of the first electromagnetic switching device in the power-off trigger branch is also switched to the normally-closed state, a passage is formed between the high-voltage end of the power supply output of the uninterruptible power supply and the power-off control end of the uninterruptible power supply, the power-off control end of the uninterruptible power supply starts to execute power-off operation, and remote power-off control of the uninterruptible power supply is realized.
In the above method for controlling remote power-off of an uninterruptible power supply, preferably, the preset power-off duration is 2 hours.
In the remote shutdown control method of the uninterruptible power supply, preferably, the preset electric quantity limit value is 10% -20% of the rated electric quantity of the uninterruptible power supply.
Compared with the prior art, the invention has the following beneficial effects:
1. the remote shutdown control system and the control method for the uninterruptible power supply can effectively control the uninterruptible power supply to execute remote shutdown when the power of the uninterruptible power supply is cut off to reach the preset power-off duration or the electric quantity of the uninterruptible power supply is smaller than the preset electric quantity limit value in the power-off state of the mains supply, reduce the risk of damage of the uninterruptible power supply caused by deep discharge of the built-in battery of the uninterruptible power supply, and realize over discharge protection control on the operation of the uninterruptible power supply in a wind turbine generator.
2. According to the remote shutdown control system and the control method for the uninterruptible power supply, under the condition that the uninterruptible power supply works normally and the mains supply is not powered off, even if the remote shutdown enabling signal output end of the main controller sends a low-level signal due to misoperation, the remote shutdown operation of the uninterruptible power supply is not triggered, and the remote shutdown control system and the control method for the uninterruptible power supply have good reliability and working stability.
Drawings
Fig. 1 is a circuit configuration diagram of a remote shutdown control system of an uninterruptible power supply according to an embodiment of the invention.
Fig. 2 is a circuit configuration diagram of a remote shutdown control system of an uninterruptible power supply according to a second embodiment of the invention.
Fig. 3 is a circuit configuration diagram of a third embodiment of a remote shutdown control system for an uninterruptible power supply.
Reference numerals illustrate:
the UPS is an uninterruptible power supply;
b1 is a temperature control switch; 01-02 is the switch part of the temperature control switch B1;
k1 is a multi-contact electromagnetic switching device; 11-12 are electromagnetic control parts of the multi-contact electromagnetic switching device K1, 13-14 are first switching parts of the multi-contact electromagnetic switching device K1, 15-16 are second switching parts of the multi-contact electromagnetic switching device K1, and 17-18 are third switching parts of the multi-contact electromagnetic switching device K1;
k2 is a time-delay electromagnetic switching device; 21-22 are electromagnetic control parts of the delay electromagnetic switch device K2, 2c are delay trigger ends of the electromagnetic control parts of the delay electromagnetic switch device K2, and 23-24 are switch parts of the delay electromagnetic switch device K2;
k3 is a single-pole double-throw electromagnetic switch device; 31-32 are electromagnetic control parts of the single-pole double-throw electromagnetic switch device K3, and 33, 34 and 35 are respectively a first switch terminal, a second switch terminal and a third switch terminal of the single-pole double-throw electromagnetic switch device K3;
k4 is a first electromagnetic switching device; 41-42 are electromagnetic control parts of the first electromagnetic switching device K4, and 43-44 are switching parts of the first electromagnetic switching device K4;
k5 is a second multi-contact electromagnetic switching device; 51-52 are electromagnetic control parts of the second multi-contact electromagnetic switching device K5, 53-54 are first switching parts of the second multi-contact electromagnetic switching device K5, and 55-56 are second switching parts of the second multi-contact electromagnetic switching device K5;
k6 is a second electromagnetic switching device; 61-62 are electromagnetic control parts of the second electromagnetic switching device K6, and 63-64 are switching parts of the second electromagnetic switching device K6.
In the drawing, the illustrated state of the switching unit of the time delay electromagnetic switching device K2 is a state when the delay trigger end of the electromagnetic control unit of the time delay electromagnetic switching device K2 is powered on; the illustrated states of the switching units of the respective other electromagnetic switching devices are all states when the electromagnetic control units of the respective electromagnetic switching devices are powered off.
Detailed Description
Embodiment one:
in the control system of the wind turbine generator system, a main controller, namely a controller in a main control cabinet, is usually a PLC controller (Programmable Logic Controller ), is powered by an electric loop formed by a high-voltage end 24VDC and a low-voltage end 0VDC, which are supplied and output by an uninterruptible power supply UPS, and is responsible for controlling the operation of other electric, microelectronic and power electronic components in the control cabinet, including monitoring and controlling the running state of the uninterruptible power supply UPS, so that the main controller is in signal communication with the uninterruptible power supply UPS, and can monitor the power supply state of the uninterruptible power supply UPS and the electric quantity state information of an internal battery. Therefore, the main controller can be used for assisting in implementing the operation protection of the uninterruptible power supply UPS under low power.
As shown in fig. 1, the present invention provides a remote shutdown control system of an uninterruptible power supply, which includes a mains supply branch connected in parallel between a first power supply end 230VAC-L and a second power supply end 230VAC-N of the mains supply, for supplying power to the uninterruptible power supply UPS; in the invention, the positions of the first power supply end and the second power supply end can be interchanged, namely the first power supply end can be 230VAC-N, and the second power supply end can be 230VAC-L, and the implementation of the technical scheme of the invention is not influenced; the high-voltage end 24VDC and the low-voltage end 0VDC of the power supply output of the uninterruptible power supply UPS are connected to the main controller of the wind turbine generator and used for supplying power to the main controller; the power supply control branch circuit comprises an electromagnetic control part of a multi-contact electromagnetic switching device K1 and a first switching part of the multi-contact electromagnetic switching device K1 which are connected in series, and a second switching part of the multi-contact electromagnetic switching device K1 is connected in series in the mains supply branch circuit; the first switch part and the second switch part of the multi-contact electromagnetic switch device K1 are closed and conducted after the electromagnetic control part of the multi-contact electromagnetic switch device K1 is electrified; the remote shutdown control system further comprises a remote shutdown enabling branch circuit connected between a remote shutdown enabling signal output end 'UPS_SD' of the main controller and a low-voltage end of the UPS power supply output, wherein the remote shutdown enabling branch circuit is connected with an electromagnetic control part of the first electromagnetic switching device K4; the remote shutdown enabling signal output end 'UPS_SD' of the main controller outputs a low level when the power of the mains supply is cut off to reach a preset power-off duration or the electric quantity of the uninterruptible power supply UPS is smaller than a preset electric quantity limit value in a power-off state of the mains supply, otherwise, outputs a high level; the power-off trigger branch circuit is connected between a high-voltage end of the power supply output of the uninterruptible power supply UPS and a power-off control end SD of the uninterruptible power supply UPS, and comprises a switch part of a first electromagnetic switch device K4 and a third switch part of a multi-contact electromagnetic switch device K1 which are connected in series; after the electromagnetic control part of the first electromagnetic switch device K4 is powered on, the switch part is switched from a normally-closed state to an open state; after the electromagnetic control part of the multi-contact electromagnetic switch device K1 is powered on, the third switch part is switched from a normally-closed state to an open state; when the shutdown control end SD of the uninterrupted power supply UPS is powered on, the uninterrupted power supply UPS starts to execute shutdown operation.
The invention relates to a remote shutdown control system of an uninterruptible power supply, which comprises the following control modes: in the normal working process after the uninterrupted power supply is started, under the condition that the mains supply is kept powered, the electromagnetic control part of the multi-contact electromagnetic switching device K1 is kept in a power-on state due to the fact that the power supply control branch is powered on, the third switch part of the multi-contact electromagnetic switching device K1 is in a disconnection state in the shutdown triggering branch, meanwhile, the remote shutdown enabling signal output end 'UPS_SD' of the main controller outputs a high level, the electromagnetic control part of the first electromagnetic switching device K4 is powered on, the switch part of the first electromagnetic switching device K4 in the shutdown triggering branch is also in a disconnection state, and therefore the shutdown control end 'SD' of the uninterrupted power supply UPS is in a non-power-on state and the uninterrupted power supply UPS is not triggered; when the mains supply is powered off to enable the electromagnetic control part of the multi-contact electromagnetic switch device K1 in the power supply control branch circuit to lose power, the third switch part of the multi-contact electromagnetic switch device K1 in the power off triggering branch circuit is switched to a normally closed state, when the mains supply is powered off to reach a preset power off duration or the electric quantity of the uninterruptible power supply UPS in the power off state is smaller than a preset electric quantity limit value, the remote power off enabling signal output end 'UPS_SD' of the main controller outputs a low level, the electromagnetic control part of the first electromagnetic switch device K4 is powered off to enable the switch part of the first electromagnetic switch device K4 in the power off triggering branch circuit to be switched to the normally closed state, a passage is formed between the high-voltage end of the power supply output of the uninterruptible power supply UPS and the power off control end 'SD' of the uninterruptible power supply UPS, the power off control end 'SD' of the uninterruptible power supply UPS is powered on, power off operation is started to be executed, and remote power off control of the uninterruptible power supply UPS is realized.
In specific applications, the preset power-off duration and the preset power limit value can be designed according to the actual protection requirement of the UPS, for example, the preset power-off duration can be set to 2 hours, and the preset power limit value can be set to 10% -20% of the rated power of the UPS. For the active controller such as the PLC, the value of the preset power-off duration and the preset electric quantity limit value is a comparison reference value set in the system, after the system is set, the comparison and judgment control process is completely executed by the existing control program of the active controller, the signal value comparison is executed, and a level signal is output according to the comparison result, so that the active controller can be realized by using the existing PLC.
Of course, under the condition that the uninterruptible power supply works normally and the mains supply is not powered off, as the mains supply keeps the electromagnetic control part of the multi-contact electromagnetic switching device K1 in the power supply control branch circuit in a power-on state, the third switch part of the multi-contact electromagnetic switching device K1 in the power-off triggering branch circuit is in a power-off state, and the electric connection path between the high-voltage end and the power-off control end 'SD' of the uninterruptible power supply UPS is disconnected, even if the remote power-off enabling signal output end 'UPS_SD' of the main controller sends a low-level signal due to misoperation, the remote power-off operation of the uninterruptible power supply UPS is not triggered; in addition, after the uninterruptible power supply is turned off remotely, if the mains supply is powered back on, the power supply control branch can be controlled to be turned on again under the condition allowed by the temperature environment, so that the uninterruptible power supply UPS is restarted.
Embodiment two:
when the uninterruptible power supply needs to be restarted after being shut down, if the uninterruptible power supply is started in a temperature environment lower than 5 ℃, the UPS is easy to damage, and the operation stability of the UPS is also adversely affected, so that the uninterruptible power supply UPS is preferably provided with a protection measure for preventing the UPS from being started at a low temperature.
In the remote shutdown control system of the uninterruptible power supply, the power supply control branch is used for maintaining the continuous power supply state of the uninterruptible power supply under the normal working state. In contrast, the electromagnetic control of the multi-contact electromagnetic switching device K1 can be configured to control its electrical state by means of a temperature-controlled switch. For example, as shown in fig. 1, the temperature control switch B1 may be designed to be capable of switching and controlling the electromagnetic control portion of the multi-contact electromagnetic switching device K1 to be powered when the ambient temperature is greater than or equal to a preset starting temperature, and the preset starting temperature may be set to 5 ℃ to match the low-temperature starting lower limit temperature of the UPS.
In this way, when the uninterruptible power supply is not powered on and started after being turned off and the environmental temperature in the control cabinet is lower than the preset starting temperature of 5 ℃, the temperature control switch B1 cannot control the electromagnetic control part of the switching control multi-contact electromagnetic switching device K1 to be powered on, so that the first switch part and the second switch part of the multi-contact electromagnetic switching device K1 are in a disconnected state, the power supply control branch and the mains supply branch for supplying power to the uninterruptible power supply UPS are not conducted and are not started; at this time, the temperature control switch B1 may be used to switch and control the heating circuit in the control cabinet, so as to heat the temperature in the control cabinet, where the heating circuit is one of the common circuits in the control circuit of the control cabinet, and the specific circuit is designed as a mature prior art, which is not described herein. When the internal temperature of the control cabinet rises to be greater than or equal to a preset starting temperature of 5 ℃, the temperature control switch B1 controls the electromagnetic control part of the multi-contact electromagnetic switching device K1 to be switched on, so that the second switch part of the multi-contact electromagnetic switching device K1 is conducted, a mains supply branch is conducted to provide 230VAC power for the uninterruptible power supply UPS, the uninterruptible power supply UPS is started, and damage to the uninterruptible power supply due to low-temperature starting is reduced; meanwhile, the first switch part of the multi-contact electromagnetic switch device K1 in the power supply control branch is also conducted, so that a continuous power supply path is formed by the power supply control branch, continuous power supply is realized for the electromagnetic control part of the multi-contact electromagnetic switch device K1, the multi-contact electromagnetic switch device K1 forms a self-locking power supply loop, after that, even if the environment temperature in the control cabinet is lower than the preset starting temperature of 5 ℃ again, the temperature control switch B1 cuts off the power supply of the electromagnetic control part of the multi-contact electromagnetic switch device K1, the multi-contact electromagnetic switch device K1 is not powered down again to cut off the mains supply branch, continuous power supply after the uninterrupted power supply UPS is started is ensured, frequent power failure, restarting and other operations of the uninterrupted power supply UPS caused by fluctuation of the environment temperature around the preset starting temperature are avoided, damage caused by frequent starting of the uninterrupted power supply UPS under the low-temperature environment around the preset starting temperature is avoided, and the service life and the working stability of the uninterrupted power supply UPS are ensured more advantageously.
In the remote shutdown control system of the uninterruptible power supply, the circuit design of the temperature control switch B1 for switching and controlling the electromagnetic control part of the multi-contact electromagnetic switch device K1 to be electrified can have various forms. For example, as shown in fig. 1, two ends of the electromagnetic control part of the multi-contact electromagnetic switch device K1 may be directly connected in parallel between the first power end and the second power end of the mains supply, and a temperature control switch B1 is disposed in the parallel branch, so that after the temperature control switch B1 is switched on when the ambient temperature is greater than or equal to the preset starting temperature, the electromagnetic control part of the multi-contact electromagnetic switch device K1 can obtain electricity; however, in such a circuit design manner, when the internal environmental temperature of the control cabinet fluctuates near the preset starting temperature and does not reach above the preset starting temperature value, the temperature control switch B1 may be triggered to be turned on to enable the electromagnetic control part of the multi-contact electromagnetic switch device K1 to be powered on, and the UPS is triggered to start, so that the UPS is not protected by effective low-temperature starting.
Therefore, as a circuit design scheme with better stability, as shown in fig. 2, in the remote shutdown control system of the uninterruptible power supply of the present invention, a temperature control branch and a start trigger branch connected in parallel between a first power supply end and a second power supply end of the mains supply may also be designed; the temperature control switch B1 is arranged in the temperature control branch, the temperature control branch further comprises an electromagnetic control part of a single-pole double-throw electromagnetic switch device K3 connected in series with the temperature control switch B1, and the temperature control switch B1 is switched on when the ambient temperature is greater than or equal to a preset starting temperature; the starting triggering branch circuit comprises an electromagnetic control part of a delay electromagnetic switch device K2 which is connected in parallel between the first power end and the second power end, the delay triggering end of the electromagnetic control part of the delay electromagnetic switch device K2 is connected to a second switch terminal of a single-pole double-throw electromagnetic switch device K3, a first switch terminal of the single-pole double-throw electromagnetic switch device K3 is connected to a first power end of a mains supply, a third switch terminal of the single-pole double-throw electromagnetic switch device K3 is connected between an electromagnetic control part of a multi-contact electromagnetic switch device K1 and a first switch part of the multi-contact electromagnetic switch device K1 in the power supply control branch circuit through a switch part of the delay electromagnetic switch device K2, and one terminal of the electromagnetic control part of the multi-contact electromagnetic switch device K1, which is far away from the first switch part of the multi-contact electromagnetic switch device K1, is connected to the second power end of the mains supply; when the electromagnetic control part of the single-pole double-throw electromagnetic switch device K3 is powered off, the first switch terminal and the second switch terminal are conducted, and when the electromagnetic control part of the single-pole double-throw electromagnetic switch device K3 is powered on, the first switch terminal and the third switch terminal are conducted; when the delay triggering end of the electromagnetic control part of the delay electromagnetic switch device K2 is in a power-on state, the switch part of the delay electromagnetic switch device K2 is kept in a closed and conducting state, and when the delay triggering end of the electromagnetic control part of the delay electromagnetic switch device K2 is changed from the power-on state to a power-off state, the switch part of the delay electromagnetic switch device K2 is immediately opened and is closed and conducted again after the preset delay time.
In this way, when the uninterrupted power supply UPS is not powered on and started, when the environmental temperature in the control cabinet is lower than the preset starting temperature of 5 ℃, the temperature control switch B1 does not conduct the temperature control branch, the electromagnetic control part of the single-pole double-throw electromagnetic switch device K3 is in a power-off state, the first switch terminal and the second switch terminal of the single-pole double-throw electromagnetic switch device K3 are conducted, the delay triggering end of the electromagnetic control part of the delay electromagnetic switch device K2 is in a power-on state, and the switch part of the delay electromagnetic switch device K2 is kept in a closed conduction state; however, the electromagnetic control part for controlling the multi-contact electromagnetic switch device K1 is still not powered, so that the first switch part and the second switch part of the multi-contact electromagnetic switch device K1 are both in an off state, the power supply control branch and the mains supply branch for supplying power to the uninterruptible power supply UPS are not powered on, and the uninterruptible power supply UPS cannot be started.
When the environmental temperature in the control cabinet is greater than or equal to the preset starting temperature of 5 ℃, the temperature control switch B1 controls the switching control temperature control branch to be conducted, the electromagnetic control part of the single-pole double-throw electromagnetic switch device K3 is electrified, the first switch terminal and the third switch terminal of the single-pole double-throw electromagnetic switch device K3 are conducted, the delay triggering end of the electromagnetic control part of the delay electromagnetic switch device K2 is changed from the electrified state to the deenergized state, at the moment, the switch part of the delay electromagnetic switch device K2 is immediately disconnected, and the switch part of the multi-contact electromagnetic switch device K2 is closed and conducted again after the preset delay time, so that the electromagnetic control part of the multi-contact electromagnetic switch device K1 cannot be immediately electrified until the switch part of the delay electromagnetic switch device K2 is closed and conducted again after the preset delay time, and at the moment, if the environmental temperature in the control cabinet fluctuates, the first switch terminal and the third switch terminal of the single-pole double-throw electromagnetic switch device K3 cannot be kept to be disconnected, the electromagnetic switch part of the single-pole double-throw electromagnetic switch device K3 is disconnected, and the electromagnetic switch part of the multi-contact electromagnetic switch device K1 still cannot be disconnected, and the first switch part of the UPS still cannot be disconnected, and the power supply is still in the disconnected state; if the switch part of the delay electromagnetic switch device K2 is closed and conducted again after the preset delay time, if the environmental temperature in the control cabinet is still kept at a preset starting temperature greater than or equal to 5 ℃, the first switch terminal and the third switch terminal of the single-pole double-throw electromagnetic switch device K3 are controlled by the temperature control switch B1 to be conducted, the electromagnetic control part of the multi-contact electromagnetic switch device K1 is powered on through an electric loop formed by the switch part of the delay electromagnetic switch device K2 and the conduction of the first switch terminal and the third switch terminal of the single-pole double-throw electromagnetic switch device K3, the first switch part and the second switch part of the multi-contact electromagnetic switch device K1 are conducted, the commercial power supply branch and the power supply control branch are communicated, the uninterrupted power supply is powered on, and the self-locking power supply loop is formed in the power supply control branch through the multi-contact electromagnetic switch device K1.
Therefore, after the environmental temperature in the control cabinet is more stable and reaches the preset starting temperature condition, the uninterrupted power supply UPS can be powered and started, the risk of damage to the uninterrupted power supply due to low-temperature starting is further reduced, and the service life and the working stability of the uninterrupted power supply UPS are more favorably ensured. When the control cabinet is particularly applied, the preset delay time of the delay electromagnetic switch device K2 can be selected and set to be 10-20 seconds according to the needs, so that the environment temperature in the control cabinet can be better ensured to be more stable and reach the preset starting temperature condition.
Embodiment III:
in the normal working process after the uninterrupted power supply is started, if the ambient temperature is reduced to-30 ℃ to-20 ℃ or even below, the uninterrupted power supply UPS and the PLC controller continuously work under the condition of excessively low temperature, the built-in battery and the PLC controller of the UPS can be possibly damaged, and therefore, the uninterrupted power supply UPS and the PLC controller can be preferably provided with low-temperature protection measures for preventing the uninterrupted power supply UPS and the PLC controller from continuously running for a long time under the excessively low-temperature environment.
In view of this, on the basis of the remote shutdown control system scheme of the uninterruptible power supply according to the first embodiment or the second embodiment, as shown in fig. 3, a first switch portion of a series-connected second multi-contact electromagnetic switch device K5 may be further added to the power supply control branch; meanwhile, a switching part of a second electromagnetic switching device K6 is connected in series on a power supply line of the uninterruptible power supply UPS for supplying power to the main controller, a low-temperature protection control branch is connected in parallel between a high-voltage end and a low-voltage end of power supply output of the uninterruptible power supply UPS, and the low-temperature protection control branch comprises an electromagnetic control part of the second electromagnetic switching device K6 and a second switching part of a second multi-contact electromagnetic switching device K5 which are connected in series; after the electromagnetic control part of the second electromagnetic switching device K6 is electrified, the switching part is closed and conducted; in addition, a low-temperature protection enabling branch circuit connected between a low-temperature protection enabling signal output end 'UPS_RESET' of the main controller and a low-voltage end of the UPS power supply output is additionally arranged, and an electromagnetic control part of a second multi-contact electromagnetic switching device K5 is connected to the low-temperature protection enabling branch circuit; the low-temperature protection enabling signal output end of the main controller outputs a high level when the ambient temperature is lower than a preset protection temperature, otherwise, outputs a low level; after the electromagnetic control part of the second multi-contact electromagnetic switch device K5 is powered on, the first switch part and the second switch are switched to be opened from the normally-closed state. The preset protection temperature is lower than the low-temperature starting temperature of the uninterruptible power supply, and can be set to be minus 30 ℃ to minus 20 ℃ generally, and the low-temperature starting temperature of the uninterruptible power supply is 5 ℃ generally.
In this way, in the normal working process after the uninterrupted power supply is started, when the ambient temperature is equal to or higher than the preset protection temperature, the low-temperature protection enabling signal output end 'UPS_RESET' of the main controller outputs a low level, the electromagnetic control part of the second multi-contact electromagnetic switching device K5 is powered off, the first switching part of the second multi-contact electromagnetic switching device K5 in the power supply control branch and the second switching part of the electromagnetic switching device K5 in the low-temperature protection control branch are kept in a normally closed state, the electromagnetic control part of the second electromagnetic switching device K6 in the low-temperature protection control branch is powered on, so that the switching part of the second electromagnetic switching device K6 is kept on a power supply line for supplying power to the main controller by the uninterrupted power supply UPS, and the main controller can normally supply power; and, under the condition that the mains supply keeps supplying power, make the power supply control branch road get power, the electromagnetic control portion of the multi-contact electromagnetic switching device K1 keeps getting the electric state, the third switch portion of the multi-contact electromagnetic switching device K1 is also in the off-state in the off-triggering branch road, meanwhile the long-range off enable signal output end "UPS_SD" of the main controller outputs the high level, the electromagnetic control portion of the first electromagnetic switching device K4 gets power, the switch portion of the first electromagnetic switching device K4 is also in the off-state in the off-triggering branch road, make the off control end "SD" of the uninterruptible power supply UPS be in the off-state, will not trigger the uninterruptible power supply UPS to turn off.
When the ambient temperature is lower than the preset protection temperature, the low-temperature protection enabling signal output end 'UPS_RESET' of the main controller outputs a high level, and the electromagnetic control part of the second multi-contact electromagnetic switching device K5 is electrified, so that the first switching part of the second multi-contact electromagnetic switching device K5 in the power supply control branch and the second switching part of the electromagnetic switching device K5 in the low-temperature protection control branch are switched into an off state; the first switch part of the second multi-contact electromagnetic switch device K5 is disconnected to cause the electromagnetic control part of the multi-contact electromagnetic switch device K1 in the power supply control branch to lose electricity, the third switch part of the multi-contact electromagnetic switch device K1 in the shutdown trigger branch is switched to a normally-closed state, meanwhile, the second switch of the electromagnetic switch device K5 is disconnected to cause the electromagnetic control part of the second electromagnetic switch device K6 in the low-temperature protection control branch to lose electricity, so that the switch part of the second electromagnetic switch device K6 disconnects a power supply circuit for supplying power to the main controller by the uninterrupted power supply UPS, the main controller is powered down and turned off, and the low-temperature protection enabling signal output end 'UPS_RESET' and the remote shutdown enabling signal output end 'UPS_SD' of the main controller are both output to be low level due to shutdown and power down; the output end of the remote shutdown enabling signal is of low level so that the electromagnetic control part of the first electromagnetic switching device K4 is powered off, and further the switching part of the first electromagnetic switching device K4 in the shutdown triggering branch is also switched to a normally-closed state, so that a passage is formed between the high-voltage end of the power supply output of the uninterruptible power supply UPS and the shutdown control end SD of the uninterruptible power supply UPS, the shutdown control end SD of the uninterruptible power supply UPS is powered on, and shutdown operation is started to be executed; meanwhile, the output of the low-temperature protection enabling signal output end 'UPS_RESET' is low level, so that the electromagnetic control part of the second multi-contact electromagnetic switch device K5 is powered off, further, the first switch part of the second multi-contact electromagnetic switch device K5 in the power supply control branch and the second switch of the electromagnetic switch device K5 in the low-temperature protection control branch are restored to a normally closed state, at the moment, the uninterrupted power supply UPS is required to be powered off for a long time (about the shutdown program setting of a UPS manufacturer) from the start of the shutdown operation to the complete shutdown operation, the uninterrupted power supply UPS is not completed yet, so that the uninterrupted power supply UPS still executes power supply output, the electromagnetic control part of the second electromagnetic switch device K6 in the low-temperature protection control branch is powered on again, so that the switch part of the second electromagnetic switch device K6 is powered on a power supply line of the uninterrupted power supply UPS to the main controller, and the main controller is powered on again and restarted; the starting process of the main controller usually needs 2-3 min, namely the time required by the starting process of the main controller is longer than the time required by the uninterrupted power supply UPS to finish shutdown operation, and the remote shutdown enable signal output end 'UPS_SD' of the main controller still outputs low level in the starting process of the main controller, so that the electromagnetic control part of the first electromagnetic switching device K4 is continuously in a power-off state, and the switching part of the first electromagnetic switching device K4 in the shutdown triggering branch is continuously kept in a normally-closed state; meanwhile, after the electromagnetic control part of the multi-contact electromagnetic switch device K1 in the power supply control branch is powered off due to the fact that the first switch part of the second multi-contact electromagnetic switch device K5 is disconnected, the preset protection temperature is lower than the low-temperature starting temperature allowed by the uninterruptible power supply, the current environment temperature is lower than the preset protection temperature, the current environment temperature is insufficient to trigger the low-temperature starting operation allowed by the uninterruptible power supply, the electromagnetic control part of the multi-contact electromagnetic switch device K1 cannot be powered on again, the electromagnetic control part of the multi-contact electromagnetic switch device K1 keeps on in a power-off state due to the fact that the electromagnetic control part cannot be powered on again, the third switch part of the multi-contact electromagnetic switch device K1 keeps on in a normally-off state in the power-off triggering branch, a path is kept between the high-voltage end of power supply output of the uninterruptible power supply UPS and the power-off control end SD of the uninterruptible power supply UPS, and the power-off control end SD of the uninterruptible power supply UPS keeps on, so that the uninterruptible power supply UPS keeps executing power-off operation until the uninterruptible power supply UPS is powered off; and after the uninterrupted power supply UPS is powered off, stopping supplying power to the main controller, and powering off the main controller, so that the low-temperature protection power-off control of the uninterrupted power supply UPS and the main controller is realized.
When the temperature monitoring circuit is particularly applied, the main controller can acquire the ambient temperature through the low-temperature protection sensor so as to control the low-temperature protection enable signal output end 'UPS_RESET' to output a high level when the ambient temperature is lower than the preset protection temperature, so that the temperature monitoring circuit is simpler in design; in addition, the preset protection temperature can be set to be minus 30 ℃ to minus 20 ℃ so as to be matched with the low-temperature protection requirements of the uninterrupted power supply UPS and the active controller. For the active controller such as the PLC, the value of the preset protection temperature is a comparison reference value set in the system, after the system is set, the comparison and judgment control process is completely executed by the existing control program of the active controller, the comparison of the signal values is executed, and a level signal is output according to the comparison result, so that the active controller such as the PLC is simple and conventional, and the active controller can be realized by using the existing PLC.
Finally, it is noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (9)
1. A remote shutdown control system of an uninterruptible power supply comprises a mains supply branch connected in parallel between a first power end and a second power end of the mains supply, and is used for supplying power to the Uninterruptible Power Supply (UPS); the high-voltage end and the low-voltage end of the power supply output of the Uninterruptible Power Supply (UPS) are connected to a main controller of the wind turbine generator set and are used for supplying power to a power supply of the main controller; the method is characterized in that:
the power supply control branch circuit is connected in parallel between a first power end and a second power end of the mains supply, and comprises an electromagnetic control part of a multi-contact electromagnetic switching device (K1) and a first switching part of the multi-contact electromagnetic switching device (K1) which are connected in series, and a second switching part of the multi-contact electromagnetic switching device (K1) is connected in series in the mains supply branch circuit; the first switch part and the second switch part of the multi-contact electromagnetic switch device (K1) are closed and conducted after the electromagnetic control part of the multi-contact electromagnetic switch device (K1) is electrified;
the remote shutdown control device further comprises a remote shutdown enabling branch circuit connected between a remote shutdown enabling signal output end of the main controller and a low-voltage end of Uninterruptible Power Supply (UPS) power supply output, wherein the remote shutdown enabling branch circuit is connected with an electromagnetic control part of a first electromagnetic switching device (K4); the remote shutdown enabling signal output end of the main controller outputs a low level when the power of the mains supply is cut off to reach a preset power-off duration or the electric quantity of an Uninterruptible Power Supply (UPS) is smaller than a preset electric quantity limit value in a power-off state of the mains supply, otherwise, outputs a high level;
the power-off trigger branch circuit is connected between a high-voltage end of power supply output of an Uninterruptible Power Supply (UPS) and a power-off control end of the UPS, and comprises a switch part of a first electromagnetic switch device (K4) and a third switch part of a multi-contact electromagnetic switch device (K1) which are connected in series; after the electromagnetic control part of the first electromagnetic switch device (K4) is powered on, the switch part is switched from a normally-closed state to an open state; after the electromagnetic control part of the multi-contact electromagnetic switch device (K1) is powered on, the third switch part is switched from a normally-closed state to an open state; when the shutdown control end of the Uninterruptible Power Supply (UPS) is powered on, the Uninterruptible Power Supply (UPS) starts to execute shutdown operation.
2. The remote power-off control system of claim 1, wherein the preset power-off duration is 2 hours.
3. The remote power-off control system of claim 1, wherein the preset power limit is 10% -20% of a rated power of an Uninterruptible Power Supply (UPS).
4. The remote shutdown control system of claim 1, further comprising a temperature control leg and a start trigger leg connected in parallel between the first power terminal and the second power terminal of the mains power supply;
the temperature control branch circuit comprises a temperature control switch (B1) and an electromagnetic control part of a single-pole double-throw electromagnetic switch device (K3) which are connected in series, and the temperature control switch (B1) is switched on when the ambient temperature is greater than or equal to a preset starting temperature;
the starting triggering branch circuit comprises an electromagnetic control part of a time-delay electromagnetic switch device (K2) which is connected in parallel between the first power end and the second power end, the time-delay triggering end of the electromagnetic control part of the time-delay electromagnetic switch device (K2) is connected to a second switch terminal of a single-pole double-throw electromagnetic switch device (K3), a first switch terminal of the single-pole double-throw electromagnetic switch device (K3) is connected to a first power end of a mains supply, a third switch terminal of the single-pole double-throw electromagnetic switch device (K3) is connected between the electromagnetic control part of a multi-contact electromagnetic switch device (K1) and the first switch part of the multi-contact electromagnetic switch device (K1) in the power supply control branch circuit through the switch part of the time-delay electromagnetic switch device (K2), and one terminal of the electromagnetic control part of the multi-contact electromagnetic switch device (K1) in the power supply control branch circuit is far away from the first switch part of the multi-contact electromagnetic switch device (K1) and is connected to the second power end of the mains supply; when the electromagnetic control part of the single-pole double-throw electromagnetic switch device (K3) is powered off, the first switch terminal and the second switch terminal are conducted, and when the electromagnetic control part of the single-pole double-throw electromagnetic switch device (K3) is powered on, the first switch terminal and the third switch terminal are conducted; when the delay triggering end of the electromagnetic control part of the delay electromagnetic switch device (K2) is in a power-on state, the switch part of the delay electromagnetic switch device is kept in a closed and conducting state, and when the delay triggering end of the electromagnetic control part of the delay electromagnetic switch device (K2) is changed from the power-on state to a power-off state, the switch part of the delay electromagnetic switch device (K2) is immediately opened and is closed and conducted again after the preset delay time.
5. The remote power-off control system of an uninterruptible power supply according to claim 4, wherein a preset starting temperature of the temperature control switch (B1) is set to 5 ℃.
6. The remote power-off control system of the uninterruptible power supply according to claim 4, wherein the preset delay time of the delay electromagnetic switching device (K2) is 10-20 seconds.
7. The remote shutdown control method for the uninterruptible power supply, which is characterized in that the remote shutdown control system for the uninterruptible power supply is adopted for control, and the control method specifically comprises the following steps:
in the normal working process after the uninterrupted power supply is started, under the condition that the mains supply is kept powered, the electromagnetic control part of the multi-contact electromagnetic switching device (K1) is kept in a power-on state due to the fact that the power supply control branch is powered on, the third switching part of the multi-contact electromagnetic switching device (K1) is in a disconnection state in the shutdown triggering branch, meanwhile, the remote shutdown enabling signal output end of the main controller outputs a high level, the electromagnetic control part of the first electromagnetic switching device (K4) is powered on, and the switching part of the first electromagnetic switching device (K4) in the shutdown triggering branch is also in a disconnection state, so that the shutdown control end of the Uninterrupted Power Supply (UPS) is in a non-power-on state;
when the power failure of the mains supply reaches the preset power failure duration or the electric quantity of an Uninterruptible Power Supply (UPS) is smaller than the preset electric quantity limit value in the power failure state of the mains supply, the power failure of the mains supply causes the electromagnetic control part of the multi-contact electromagnetic switching device (K1) in the power supply control branch to lose power, the third switching part of the multi-contact electromagnetic switching device (K1) in the power off triggering branch is switched to be in a normally closed state, meanwhile, the remote power off enabling signal output end of the main controller outputs a low level, the electromagnetic control part of the first electromagnetic switching device (K4) is powered off, the switching part of the first electromagnetic switching device (K4) in the power off triggering branch is also switched to be in a normally closed state, so that a passage is formed between the high-voltage end of the power supply output of the Uninterruptible Power Supply (UPS) and the power off control end of the Uninterruptible Power Supply (UPS), the power off control end of the Uninterruptible Power Supply (UPS) is powered, and the power off control end of the Uninterruptible Power Supply (UPS) starts to execute power off operation, and remote power off control of the Uninterruptible Power Supply (UPS) is realized.
8. The method for remote power-off control of an uninterruptible power supply according to claim 7, wherein the preset power-off duration is 2 hours.
9. The method of claim 7, wherein the preset power limit is 10% -20% of a rated power of an Uninterruptible Power Supply (UPS).
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| CN203218969U (en) * | 2013-03-18 | 2013-09-25 | 南京南汽专用车有限公司 | Uninterrupted power supply (UPS) circuit for vehicle inverter and commercial power |
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| CN209389771U (en) * | 2018-12-29 | 2019-09-13 | 重庆科凯前卫风电设备有限责任公司 | A kind of remote power-off control system of uninterruptible power supply |
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| CN203218969U (en) * | 2013-03-18 | 2013-09-25 | 南京南汽专用车有限公司 | Uninterrupted power supply (UPS) circuit for vehicle inverter and commercial power |
| CN104909225A (en) * | 2015-06-25 | 2015-09-16 | 巨立电梯股份有限公司 | Machine room-free elevator UPS rescue control circuit |
| CN105275744A (en) * | 2015-11-13 | 2016-01-27 | 北京天诚同创电气有限公司 | Control device and method for low-temperature starting and running of wind generating set |
| CN209389771U (en) * | 2018-12-29 | 2019-09-13 | 重庆科凯前卫风电设备有限责任公司 | A kind of remote power-off control system of uninterruptible power supply |
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