CN106160440B - A kind of direct current system and its control unit and detection method - Google Patents
A kind of direct current system and its control unit and detection method Download PDFInfo
- Publication number
- CN106160440B CN106160440B CN201610591486.XA CN201610591486A CN106160440B CN 106160440 B CN106160440 B CN 106160440B CN 201610591486 A CN201610591486 A CN 201610591486A CN 106160440 B CN106160440 B CN 106160440B
- Authority
- CN
- China
- Prior art keywords
- protective device
- direct current
- current system
- output voltage
- safety value
- 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.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Protection Of Static Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of direct current system and its control unit and detection method, outputs enable signal to the protective device of direct current system according to preset condition first；Then the output voltage of protective device is detected；Judge whether the output voltage of protective device is less than default safety value again；When the output voltage of protective device is less than default safety value, and the output voltage of protective device is less than the duration of default safety value more than the first preset duration, determine that protective device is normal, and remove enable signal；When the output voltage of protective device is more than or equal to default safety value, and the output voltage of protective device is more than or equal to the duration of default safety value more than the second preset duration, protective device failure is determined；And then the automatic detection realized for protective device can be able to periodically detect it automatically according to preset condition, confirm its validity, ensure that the safe and reliable of direct current system even if protective device is that external protective device is equally applicable.
Description
Technical field
The present invention relates to DC source safe mode technical field, in particular to a kind of direct current system and its control unit and inspection
Survey method.
Background technique
It is needed when carrying out circuit maintenance or other emergency cases occurring by DC source in the application of DC source
Output voltage be limited within safe range so that system enters safe mode.Thus, it usually needs increase such as Fig. 1 institute
The tandem protective device or parallel protective device shown in Fig. 2 shown control the conducting of respective switch by enable signal
And shutdown, voltage Vout is limited within safe range.In specific practical application, to guarantee DC source and being connect electricity consumption
The safety of equipment needs periodically to detect the protective device of system.
Existing detection scheme is generally divided into manually and automatically two kinds, manual detection scheme, that is, artificial trigger protection device and root
Judge whether protective device is normal according to the result after its movement, but the detection cycle of manual approach and frequency are uncontrollable, it is uncomfortable
For requiring the application occasion of periodic detection；And automatic scheme is located at the situation inside equipment generally directed to protective device, is setting
Standby periodically to detect (before working normally) or to protective device when opening, which belongs to opening of device process
A part, eliminate human intervention process, but be not particularly suited for external protective device.
The case where being located at except DC source and electrical equipment for protective device, generally requires the detection of the protective device
It is controlled by DC source or electrical equipment, therefore, constructs the detection system of complete set, periodically to be detected automatically to it, really
Recognize its validity, guarantees the safe and reliable of system, be a problem to be solved.
Summary of the invention
The present invention provides a kind of direct current system and its control unit and detection method, external to solve to lack in the prior art
The problem of automatic detection scheme of protective device.
In order to achieve the object, technical solution provided by the present application is as follows:
A kind of detection method of direct current system, comprising:
The protective device of direct current system is outputed enable signal to according to preset condition；
Detect the output voltage of the protective device；
Judge whether the output voltage of the protective device is less than default safety value；
When the output voltage of the protective device is less than the default safety value, and the output voltage of the protective device is small
When the duration of the default safety value being more than the first preset duration, determine that the protective device is normal, and described in removing
Enable signal；
When the output voltage of the protective device is more than or equal to the default safety value, and the output electricity of the protective device
When the duration that pressure is more than or equal to the default safety value is more than the second preset duration, the protective device failure is determined.
Preferably, after the judgement protective device failure the step of further include: outputting alarm signal.
Preferably, further includes:
Determine that the protective device is normal and the electrical equipment or conversion equipment state of the direct current system it is normal after, control
It makes the direct current system and enters normal mode of operation.
Preferably, the electrical equipment or conversion equipment include: DC/DC converter, accessory power supply and control unit, and institute
Accessory power supply is stated for taking electricity from the output end of the DC/DC converter, is powered for described control unit；The direct current system
Detection method the protective device for outputing enable signal to the direct current system according to preset condition the step of before also wrap
It includes:
The output voltage for controlling the DC/DC converter is default supply voltage.
Preferably, the default safety value is 30V；First preset duration is 100 milliseconds, second preset duration
It is 1 second.
A kind of control unit of direct current system, comprising:
Instruction module, for outputing enable signal to the protective device of direct current system according to preset condition；
Detection module, for detecting the output voltage of the protective device；
Judgment module, for judging whether the output voltage of the protective device is less than default safety value；
Determination module is less than the default safety value for the output voltage when the protective device, and the protection fills
When the duration that the output voltage set is less than the default safety value is more than the first preset duration, the protective device is being determined just
Often, and the enable signal is removed；When the output voltage of the protective device is more than or equal to the default safety value, and the guarantor
When the duration that the output voltage of protection unit is more than or equal to the default safety value is more than the second preset duration, the guarantor is determined
Protection unit failure.
Preferably, further includes: alarm module, after determining the protective device failure, outputting alarm signal.
Preferably, further includes: the first control module, for determining that the protective device is normal and the use of the direct current system
After electric equipment or conversion equipment state are normal, control the direct current system and enter normal mode of operation.
A kind of direct current system, comprising: DC source, protective device and electrical equipment or conversion equipment；Wherein:
The DC source is for exporting direct current；
The protective device is connected between the DC source and the electrical equipment or conversion equipment, described for transmitting
Output voltage is defined within default safety value by direct current or based on the received enable signal；
The electrical equipment or conversion equipment include: converter, accessory power supply, load or power grid and any of the above-described described
The control unit of direct current system；
The accessory power supply is used to take electricity from the converter, powers for described control unit.
Preferably, the DC source are as follows: battery, capacitor or photovoltaic battery panel；
The protective device includes: be series at the direct current source output terminal and the electrical equipment or conversion equipment corresponding
Switch between input terminal, and/or, the switch being parallel between the DC source and the electrical equipment or conversion equipment；
The converter includes: DC/AC converter and/or DC/DC converter.
It preferably, include DC/DC converter in the converter, and the accessory power supply is used to convert from the DC/DC
The output end of device takes electricity, when powering for described control unit, described control unit further include: and the second control module, for controlling
The output voltage of the DC/DC converter is default supply voltage.
The detection method of the direct current system provided by the invention, outputs enable signal to direct current according to preset condition first
The protective device of system；Then the output voltage of the protective device is detected；Judging the output voltage of the protective device again is
It is no to be less than default safety value；When the output voltage of the protective device is less than the default safety value, and the protective device
When the duration that output voltage is less than the default safety value is more than the first preset duration, determine that the protective device is normal,
And remove the enable signal；When the output voltage of the protective device is more than or equal to the default safety value, and the protection
When the duration that the output voltage of device is more than or equal to the default safety value is more than the second preset duration, the protection is determined
Plant failure；The automatic detection for the protective device is realized in turn, even if the protective device is external protective device
It is equally applicable, can be able to periodically detect it automatically according to the preset condition, confirm its validity, ensure that institute
State the safe and reliable of direct current system.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, it is only this that interior attached drawing, which is described below,
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the protective device for the DC source that the prior art provides；
Fig. 2 is the structural schematic diagram of another protective device for the DC source that the prior art provides；
Fig. 3 is the flow chart of the detection method of direct current system provided in an embodiment of the present invention；
Fig. 4 be another embodiment of the present invention provides direct current system detection method another flow chart；
Fig. 5 be another embodiment of the present invention provides direct current system control unit structural schematic diagram；
Fig. 6 be another embodiment of the present invention provides direct current system control unit another structural schematic diagram；
Fig. 7 be another embodiment of the present invention provides direct current system control unit another structural schematic diagram；
Fig. 8 be another embodiment of the present invention provides direct current system structural schematic diagram；
Fig. 9 be another embodiment of the present invention provides direct current system another structural schematic diagram.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
The present invention provides a kind of detection method of direct current system, lacks oneself of external protective device in the prior art with solution
The problem of dynamic detection scheme.
Specifically, the detection method of the direct current system, as shown in Figure 3, comprising:
S101, the protective device that direct current system is outputed enable signal to according to preset condition；
The output voltage of S102, the detection protective device；
S103, judge whether the output voltage of the protective device is less than default safety value；
When the output voltage of the protective device is less than the default safety value, and the output voltage of the protective device is small
When the duration of the default safety value being more than the first preset duration, executes step S104, determining the protective device just
Often, and the enable signal is removed；
When the output voltage of the protective device is more than or equal to the default safety value, and the output electricity of the protective device
When the duration that pressure is more than or equal to the default safety value is more than the second preset duration, executes step S105, determines the guarantor
Protection unit failure.
In practical application, the protective device is can be set under normal circumstances in normally closed mode, i.e., in no institute
In the case where stating enable signal, the protective device normally closed, output voltage Vout；According to the preset condition, for example arrive
Up to regular self-test time, it is auxiliary electric electric when or when urgent or failure, the protective device will receive described
Enable signal outputs it voltage Vout and is limited within the default safety value into safe mode.In order to ensure the guarantor
The validity of protection unit can realize the detection for the protective device through the above steps.
It, can be by judging that the protection fills in order to guarantee the correctness of the result detected for the protective device
Whether the duration that the output voltage Vout set is less than the default safety value is more than first preset duration, to the guarantor
Whether protection unit, which enters safe mode, is confirmed.After determining that the protective device is normal, and remove the enable signal, institute
The output voltage Vout for stating protective device restores normal, and the direct current system enters normal operating conditions.
And if the output voltage Vout of the protective device be more than or equal to the default safety value, can by judgement described in
When whether the duration that the output voltage Vout of protective device is more than or equal to the default safety value is more than described second default
It is long, come ensure the protective device testing result correctness, when the output voltage Vout of the protective device is more than or equal to
When the duration of the default safety value is more than second preset duration, then it is assumed that the protective device cannot normally enter
Safe mode can determine that the protective device failure.
In addition, in specific practical application, according to its specific application environment, it may be necessary to the protective device into
The confirmation process of row multiple output voltage detection and duration, it can step S102 and S103 are repeated, it is final to obtain
To the judgement result of the protective device failure.
The detection method of the direct current system provided in this embodiment, the through the above steps available protective device
Normal or failure testing result, realizes the automatic detection for the protective device, even if the protective device is outer
It sets protective device to be equally applicable, can be able to periodically detect it automatically according to the preset condition, confirm it effectively
Property, it ensure that the safe and reliable of the direct current system.The detection method of the direct current system provided by the invention especially suitable for
Demand of the North America UL1741 standard to direct current system safety utilization of electric power, and without increasing additional detection device, conducive to being widely popularized.
In another specific embodiment of the present invention, on the basis of Fig. 3, after step S105 further include: output is accused
Alert signal.
After confirming that the protective device not can enter safe mode, alarm signal can be exported by described control unit,
Operator is notified to be further processed.At this point, if the protective device still can normally closed, the direct current system in principle
System can still work normally, and only there is the risk of direct current protecting.Therefore, can decide whether to continue according to system actual demand
Start the direct current system to normal operating condition (but having to last for exporting the alarm signal).
Preferably, on the basis of Fig. 3, the detection method of the direct current system further include:
Determine that the protective device is normal and the electrical equipment or conversion equipment state of the direct current system it is normal after, control
It makes the direct current system and enters normal mode of operation.
After described control unit can first confirm that the state of the electrical equipment or conversion equipment is normal, then to the protection
Device is detected, and after the detection to guarantee to complete the protective device, the direct current system can be directly entered normal work mould
Formula；Alternatively, first the protective device can also be detected after the accessory power supply and described control unit work normally,
After ensuring that it can be worked normally, then the electrical equipment or conversion equipment are confirmed, determines that the protective device is normal, and
The enable signal is removed, the direct current system is made to enter normal mode of operation.
Preferably, on the basis of Fig. 3, the electrical equipment or conversion equipment include: DC/DC converter, auxiliary electricity
Source and control unit, and the accessory power supply is used to take electricity from the output end of the DC/DC converter, supplies for described control unit
Electricity；The detection method of the direct current system, as shown in figure 4, before step S101 further include:
S100, the output voltage for controlling the DC/DC converter are default supply voltage.
When the accessory power supply is used to take electricity from the output end of the DC/DC converter, when powering for described control unit,
The output voltage that the DC/DC converter can be controlled by described control unit is default supply voltage, is converted using DC/DC
The DC capacitor of device stores energy as much as possible, in case utilizing described in the protective device detection process for accessory power supply.
Preferably, the default safety value is 30V；First preset duration is 100 milliseconds, second preset duration
It is 1 second.
The default safety value can be set according to relevant safety requirement, such as 30V, naturally it is also possible to for other tools
Body numerical value, only a kind of example, is not necessarily limited to this herein, can be set according to the actual situation.
First preset duration can according to the response time of the auxiliary electric supporting time of system and/or the protective device come
It determines, such as 100 milliseconds；Second preset duration can be greater than first preset duration, such as be selected as 1 second.It is herein only one
Kind example, is not necessarily limited to this, can be set according to the actual situation.
Another embodiment of the present invention additionally provides a kind of control unit of direct current system, as shown in Figure 5, comprising: instruction mould
Block 101, detection module 102, judgment module 103 and determination module 104；Wherein:
Instruction module 101 is used to output enable signal to the protective device of direct current system according to preset condition；
Detection module 102 is used to detect the output voltage of the protective device；
Judgment module 103 is for judging whether the output voltage of the protective device is less than default safety value；
Determination module 104 is used to be less than the default safety value, and the protection when the output voltage of the protective device
When the duration that the output voltage of device is less than the default safety value is more than the first preset duration, the protective device is determined
Normally, and the enable signal is removed；It is and described when the output voltage of the protective device is more than or equal to the default safety value
When the duration that the output voltage of protective device is more than or equal to the default safety value is more than the second preset duration, described in judgement
Protective device failure.
The control unit of the direct current system provided in this embodiment passes through the available protective device of above-mentioned principle
Normal or failure testing result, realizes the automatic detection for the protective device, even if the protective device is outer
It sets protective device to be equally applicable, can be able to periodically detect it automatically according to the preset condition, confirm it effectively
Property, it ensure that the safe and reliable of the direct current system.
In practical applications, can according to the setting to the preset condition, so that the control unit of the direct current system,
Not only reach regular self-test time, it is auxiliary electric electric when or when urgent or failure, can also according to actual needs,
Work as electric network power-fail, fire and other unsafe conditions being likely to occur occur for the DC source or other equipment in the direct current system
When, the enable signal can be exported by instruction module 101, and then control the protective device, so that the protection
Device enters safe mode, and then guarantees system safety.
Preferably, on the basis of Fig. 5, as shown in fig. 6, the control unit of the direct current system further include: alarm mould
Block 105, after determining the protective device failure, outputting alarm signal.
After confirming that the protective device not can enter safe mode, alarm signal, notice can be exported by alarm module 105
Operator is further processed.At this point, if the protective device still can normally closed, the direct current system is still in principle
It can work normally, only there is the risk of direct current protecting.Therefore, can decide whether to continue to start according to system actual demand
The direct current system has to last for exporting the alarm signal to normal operating condition.
Preferably, on the basis of Fig. 5, as shown in fig. 7, the control unit of the direct current system further include: the first control
Molding block 106, for determining that the protective device is normal and the electrical equipment or conversion equipment state of the direct current system are normal
Later, it controls the direct current system and enters normal mode of operation.
Judge that the protective device is normal and the electrical equipment or conversion equipment state of the direct current system it is normal it
Afterwards, it then controls the direct current system and enters normal mode of operation, the safety of the direct current system can be increased.
Another embodiment of the present invention additionally provides a kind of direct current system, as shown in Figure 8, comprising: DC source 100, protection dress
Set 200 and electrical equipment or conversion equipment 300；Wherein:
Protective device 200 is connected between DC source 100 and electrical equipment or conversion equipment 300；
Electrical equipment or conversion equipment 300 include: converter 301, accessory power supply 302, control unit 303 and load or electricity
Net 304；
Control unit 303 is as shown in Figure 5, comprising: instruction module 101, detection module 102, judgment module 103 and judgement mould
Block 104.
Specific working principle are as follows:
DC source 100 is for exporting direct current；
Protective device 200 for transmit the direct current or based on the received enable signal output voltage is defined in it is pre-
If within safety value；
Accessory power supply 302 is used to take electricity from converter 301, powers for control unit 303；
Instruction module 101 is used to output enable signal to protective device 200 according to preset condition；
Detection module 102 is used to detect the output voltage of protective device 200；
Judgment module 103 is for judging whether the output voltage of protective device 200 is less than default safety value；
Determination module 104 is used to be less than the default safety value, and protective device when the output voltage of protective device 200
When the duration that 200 output voltage is less than the default safety value is more than the first preset duration, the protective device is determined
Normally, and the enable signal is removed；When the output voltage of protective device 200 is more than or equal to the default safety value, and protection
When the duration that the output voltage of device 200 is more than or equal to the default safety value is more than the second preset duration, described in judgement
Protective device failure.
The direct current system provided in this embodiment is normal or former by the available protective device of above-mentioned principle
The testing result of barrier realizes the automatic detection for the protective device, even if the protective device is external protective device
It is equally applicable, can be able to periodically detect it automatically according to the preset condition, confirm its validity, ensure that institute
State the safe and reliable of direct current system.The detection method of the direct current system provided by the invention is marked especially suitable for North America UL1741
Demand of the standard to direct current system safety utilization of electric power, and without increasing additional detection device, conducive to being widely popularized.
It is worth noting that the direct current system can also be using periodically manual for the automatic detection of protective device 200
Mode add their confirmation, although its is inefficient, operability is not strong, the direct current system may be implemented to protection fill
While setting 200 automatic detection, such mode detected manually can also be received.
It in practical applications, can be according to the setting to the preset condition, so that the direct current system, not only reaches
The time of regular self-test, it is auxiliary electric electric when or urgent or failure when, can also according to actual needs, when power grid falls
Electricity can pass through when fire and other unsafe conditions being likely to occur occur for DC source or other equipment in the direct current system
Control unit 303 exports the enable signal, and then controls protective device 200, so that protective device 200 enters safety
Mode, and then guarantee system safety.
Preferably, DC source 100 can be with are as follows: battery, capacitor or photovoltaic battery panel；
Protective device 200 includes: be series at 100 output end of DC source and electrical equipment or conversion equipment 300 corresponding defeated
Enter the switch between end, and/or, the switch being parallel between DC source 100 and electrical equipment or conversion equipment 300；
Converter 301 includes: DC/AC converter and/or DC/DC converter.
In specific practical application, the form of DC source 101 is unlimited, can be voltage source or current source, such as direct current
The DC source etc. that source device, battery, capacitor, photovoltaic battery panel and other generator units are formed, output voltage Vdc；
Formula scheme in parallel or series can be used in protective device 200, is also possible to combination mode, it is usually arranged and is
Normally closed mode, and its control for switching acceptable enable signal En, protective device 200 is closed when normal work, output voltage
For Vout (when using parallel scheme, Vout=Vdc)；
Electrical equipment or conversion equipment 300 can be electrical equipment or generating equipment, such as photovoltaic DC-to-AC converter, input termination
Voltage Vout is received, enable signal En control protective unit 200 can be exported as needed when urgent or failure and connect
Or DC source 100 is disconnected, so that the direct current system enters safe mode, and then achieve the purpose that protect whole system.
In addition, electrical equipment or the specific implementation form of conversion equipment also without limitation, can be an exchange electricity consumption and set
Standby or power grid is also possible to direct-flow electricity utilization apparatus or DC load.
Preferably, as shown in fig. 6, control unit 303 further include: alarm module 105, for determining 200 event of protective device
After barrier, outputting alarm signal.
After confirmation protective device 200 not can enter safe mode, accessory power supply 302 need to work on, and can be by controlling
Unit 303 exports alarm signal, and operator is notified to be further processed.At this point, if protective device 200 still can be just normally closed
It closes, the direct current system can still work normally in principle, only there is the risk of direct current protecting.It therefore, can be according to system reality
Border demand decides whether to continue to start the direct current system to normal operating condition and (but has to last for exporting the alarm letter
Number).
Preferably, as shown in fig. 7, control unit 303 further include: the first control module 106, for determining protective device
After the electrical equipment or conversion equipment state of the 200 normal and described direct current systems are normal, control the direct current system and enter just
Normal operating mode.
It preferably, include DC/DC converter in converter 301, and accessory power supply 302 is used for from the DC/DC converter
Output end take electricity, for control unit 303 power when, control unit 303 be also used to control the DC/DC converter output electricity
Pressure is default supply voltage.
Fig. 9 is 300 schematic diagram of the present embodiment electrical equipment or conversion equipment, specifically includes that DC/DC converter 311, DC/
AC converter 312, accessory power supply 302, control unit 303 and load or power grid 304；Wherein,
DC/DC converter 311 is used to direct current being converted to direct current, and form is unlimited, for matching Vout and Vbus
Voltage is selected as needed, and it is also not necessary to (Vout and Vbus are connected directly)；
DC/AC converter 312 is used to direct current being converted to alternating current, and form is unlimited, for being converted to direct current
Alternating current, input are that Vbus output is Vac；
Load or power grid 304 connect DC/AC converter 312, and load or power grid 304, which can be, single-phase is also possible to three-phase shape
Formula is not specifically limited herein；
Accessory power supply 302 can take electricity in Vbus and/or Vac, when taking electricity only with Vbus, protection dress when normal work
200 sealing voltages output Vout is set, and DC/DC converter 311 can bypass Vout to Vbus at this time for requirement, and is taken using Vac
Electricity is using Vbus and Vac while then not limited when taking electricity；
Control unit 303 is powered by accessory power supply 302, and exportable control signal Ctr is set with controlling electrical equipment or transformation
Standby 300, and enable signal En can be exported as needed with control protective unit 200.
DC/DC converter 311 can bypass Vout to Vbus, and it is for auxiliary electricity that Vbus, which is adjusted to suitable voltage,
When source 302 only takes electric situation from Vbus, stored to the greatest extent using the DC capacitor of DC/DC converter 311 and DC/AC converter 312
May more than energy in case 200 detection process of protective device in, it is described for accessory power supply utilize；According to Vac take electricity or
When Vbus and Vac mixing takes electricity, then the output voltage for controlling the DC/DC converter without control unit 303 is default power supply
Voltage.
After protective device 200, which responds the enable signal, enters safe mode, output voltage Vout is pulled low, usually
In the case of can be lower than accessory power supply 302 operating voltage, therefore need to guarantee in the detection process accessory power supply 302 reliably supply
Electricity.First is that blocking Vbus to discharge to Vout, so that accessory power supply 302 can use using the characteristic of DC/DC converter 311
The detection time of the energy support overprotection device 200 of Vbus；First is that using Vac give accessory power supply 302 power, then power grid just
Without the concern for supporting time under normal state.
Other specific working principles are same as the previously described embodiments, and details are not described herein again.
Each embodiment is described in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (11)
1. a kind of detection method of direct current system characterized by comprising
The protective device that direct current system is outputed enable signal to according to preset condition makes the protective device enter safe mode；
When the preset condition is the time for reaching regular self-test, is auxiliary electric electric or under urgent or fault condition；
Detect the output voltage of the protective device；
Judge whether the output voltage of the protective device is less than default safety value；
When the protective device output voltage be less than the default safety value, and the output voltage of the protective device be less than institute
When stating the duration of default safety value more than the first preset duration, determine that the protective device is normal, and removes described enabled
Signal；
When the output voltage of the protective device is more than or equal to the default safety value, and the output voltage of the protective device is big
When the duration for being equal to the default safety value being more than the second preset duration, the protective device failure is determined.
2. the detection method of direct current system according to claim 1, which is characterized in that determine the protective device described
After the step of failure further include: outputting alarm signal.
3. the detection method of direct current system according to claim 1, which is characterized in that further include:
Determine that the protective device is normal and the electrical equipment or conversion equipment state of the direct current system it is normal after, control institute
It states direct current system and enters normal mode of operation.
4. the detection method of direct current system according to claim 3, which is characterized in that the electrical equipment or conversion equipment
It include: DC/DC converter, accessory power supply and control unit, and the accessory power supply is used for the output from the DC/DC converter
End takes electricity, powers for described control unit；The detection method of the direct current system exports enabled letter according to preset condition described
Number to the direct current system protective device the step of before further include:
The output voltage for controlling the DC/DC converter is default supply voltage.
5. the detection method of direct current system according to claim 1, which is characterized in that the default safety value is 30V；Institute
Stating the first preset duration is 100 milliseconds, and second preset duration is 1 second.
6. a kind of control unit of direct current system characterized by comprising
Instruction module makes the protective device for outputing enable signal to the protective device of direct current system according to preset condition
Into safe mode；When the preset condition is the time for reaching regular self-test, is auxiliary electric electric or in urgent or fault condition
Under；
Detection module, for detecting the output voltage of the protective device；
Judgment module, for judging whether the output voltage of the protective device is less than default safety value；
Determination module is less than the default safety value, and the protective device for the output voltage when the protective device
When the duration that output voltage is less than the default safety value is more than the first preset duration, determine that the protective device is normal,
And remove the enable signal；When the output voltage of the protective device is more than or equal to the default safety value, and the protection
When the duration that the output voltage of device is more than or equal to the default safety value is more than the second preset duration, the protection is determined
Plant failure.
7. the control unit of direct current system according to claim 6, which is characterized in that further include: alarm module, for sentencing
After the fixed protective device failure, outputting alarm signal.
8. the control unit of direct current system according to claim 6, which is characterized in that further include: the first control module is used
After in the judgement protective device, the electrical equipment of the normal and described direct current system or conversion equipment state are normal, described in control
Direct current system enters normal mode of operation.
9. a kind of direct current system characterized by comprising DC source, protective device and electrical equipment or conversion equipment；Wherein:
The DC source is for exporting direct current；
The protective device is connected between the DC source and the electrical equipment or conversion equipment, for transmitting the direct current
Electricity or output voltage is defined within default safety value by enable signal based on the received；
The electrical equipment or conversion equipment include: converter, accessory power supply, load or power grid and any institute of claim 6 to 8
The control unit for the direct current system stated；
The accessory power supply is used to take electricity from the converter, powers for described control unit.
10. direct current system according to claim 9, which is characterized in that the DC source are as follows: battery, capacitor or light
Lie prostrate solar panel；
The protective device includes: to be series at the corresponding input of the direct current source output terminal with the electrical equipment or conversion equipment
Switch between end, and/or, the switch being parallel between the DC source and the electrical equipment or conversion equipment；
The converter includes: DC/AC converter and/or DC/DC converter.
11. direct current system according to claim 9, which is characterized in that it include DC/DC converter in the converter, and
The accessory power supply is used to take electricity from the output end of the DC/DC converter, and when powering for described control unit, the control is single
Member further include: the second control module, the output voltage for controlling the DC/DC converter are default supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610591486.XA CN106160440B (en) | 2016-07-25 | 2016-07-25 | A kind of direct current system and its control unit and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610591486.XA CN106160440B (en) | 2016-07-25 | 2016-07-25 | A kind of direct current system and its control unit and detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106160440A CN106160440A (en) | 2016-11-23 |
| CN106160440B true CN106160440B (en) | 2019-04-09 |
Family
ID=58059625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610591486.XA Active CN106160440B (en) | 2016-07-25 | 2016-07-25 | A kind of direct current system and its control unit and detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106160440B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519530A (en) * | 2018-04-27 | 2018-09-11 | 国网江苏省电力有限公司电力科学研究院 | A kind of extra-high voltage direct-current defencive function test method synchronized based on Wide-area Measurement Information |
| CN109270450A (en) * | 2018-10-19 | 2019-01-25 | 易事特集团股份有限公司 | A kind of UPS inversion static switch open circuit detection method and device |
| CN111384895A (en) * | 2018-12-27 | 2020-07-07 | 东泰高科装备科技有限公司 | Solar cell test system, solar cell test method and storage medium |
| CN112234690A (en) * | 2020-12-15 | 2021-01-15 | 鹏城实验室 | Power supply protection circuit, apparatus and method |
| CN114167970A (en) * | 2021-12-09 | 2022-03-11 | 深圳市海浦蒙特科技有限公司 | Overcurrent protection method and related assembly |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6194877B1 (en) * | 1999-08-02 | 2001-02-27 | Visteon Global Technologies, Inc. | Fault detection in a motor vehicle charging system |
| CN101447666A (en) * | 2007-11-27 | 2009-06-03 | 深圳迈瑞生物医疗电子股份有限公司 | Power supply system and power overvoltage safety protection control method |
| CN101718842A (en) * | 2009-12-11 | 2010-06-02 | 北汽福田汽车股份有限公司 | Monitoring method and monitoring system for touch switch |
| CN103424690A (en) * | 2012-05-22 | 2013-12-04 | Ls产电株式会社 | Apparatus for diagnosing relay contact of electric vehicle and method thereof |
| CN103995211A (en) * | 2014-05-30 | 2014-08-20 | 长城汽车股份有限公司 | Method and system for detecting vehicle high-voltage system |
| CN104749459A (en) * | 2013-12-30 | 2015-07-01 | 现代自动车株式会社 | Method and system of diagnosing breakdown during pre-charging |
| CN204462334U (en) * | 2015-03-25 | 2015-07-08 | 观致汽车有限公司 | A kind of fault test set being applied to high-tension battery contactor |
| CN105186588A (en) * | 2014-02-24 | 2015-12-23 | 通用电气能源能量变换技术有限公司 | Battery energy storage system with arc flash protection, energy conversion system and protection method |
-
2016
- 2016-07-25 CN CN201610591486.XA patent/CN106160440B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6194877B1 (en) * | 1999-08-02 | 2001-02-27 | Visteon Global Technologies, Inc. | Fault detection in a motor vehicle charging system |
| CN101447666A (en) * | 2007-11-27 | 2009-06-03 | 深圳迈瑞生物医疗电子股份有限公司 | Power supply system and power overvoltage safety protection control method |
| CN101718842A (en) * | 2009-12-11 | 2010-06-02 | 北汽福田汽车股份有限公司 | Monitoring method and monitoring system for touch switch |
| CN103424690A (en) * | 2012-05-22 | 2013-12-04 | Ls产电株式会社 | Apparatus for diagnosing relay contact of electric vehicle and method thereof |
| CN104749459A (en) * | 2013-12-30 | 2015-07-01 | 现代自动车株式会社 | Method and system of diagnosing breakdown during pre-charging |
| CN105186588A (en) * | 2014-02-24 | 2015-12-23 | 通用电气能源能量变换技术有限公司 | Battery energy storage system with arc flash protection, energy conversion system and protection method |
| CN103995211A (en) * | 2014-05-30 | 2014-08-20 | 长城汽车股份有限公司 | Method and system for detecting vehicle high-voltage system |
| CN204462334U (en) * | 2015-03-25 | 2015-07-08 | 观致汽车有限公司 | A kind of fault test set being applied to high-tension battery contactor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106160440A (en) | 2016-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106160440B (en) | A kind of direct current system and its control unit and detection method | |
| CN106208129B (en) | The connection control method of parallel connection direct power supply and its device of application | |
| CN106877311B (en) | A kind of direct current photovoltaic generating system | |
| AU2018227610B2 (en) | Extending black-start availability using energy storage systems | |
| CN103384958B (en) | Power conversion device | |
| EP3082254A1 (en) | Solar photovoltaic system | |
| KR101410508B1 (en) | Direct current ground fault detecting circuit for solar cell generating system | |
| JP2012196023A (en) | Electric power controller and electric power control method | |
| EP3010110B1 (en) | Grid-tied photovoltaic power generation system | |
| JP6730826B2 (en) | Power conditioner, power supply system and current control method | |
| KR20150032052A (en) | Power conversion apparatus | |
| KR20180072476A (en) | PCS for ESS and PCS Operating Method thereof | |
| EP2680424A1 (en) | Power conversion device | |
| JP6503095B2 (en) | Charge / discharge device | |
| CN112398171A (en) | Photovoltaic system, control method thereof and air conditioning system | |
| KR101742600B1 (en) | Distributing borad with uninterruptible function | |
| JP2019092389A (en) | Power supply switching device and power supply switching system | |
| KR20170074631A (en) | Energy distribuition system in smart grid envirmnent | |
| CN105518965A (en) | Photovoltaic grid connection control method and photovoltaic grid connection system | |
| GB2509103A (en) | Controlling a turbogenerator during a grid disturbance | |
| WO2021044653A1 (en) | Power conversion apparatus and system interconnection system | |
| KR101568712B1 (en) | An islanding detection apparatus and method with partial phase window monitoring method on grid connected inverter | |
| CN206401910U (en) | A kind of electric supply installation | |
| CN111555352A (en) | Photovoltaic low-voltage protection equipment, control method, control device and storage medium | |
| CN213402467U (en) | Photovoltaic system and air conditioning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |