CN107453337A - A kind of distributed photovoltaic and network protection method and device - Google Patents
A kind of distributed photovoltaic and network protection method and device Download PDFInfo
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- CN107453337A CN107453337A CN201710784126.6A CN201710784126A CN107453337A CN 107453337 A CN107453337 A CN 107453337A CN 201710784126 A CN201710784126 A CN 201710784126A CN 107453337 A CN107453337 A CN 107453337A
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- pressing plate
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
The invention discloses a kind of distributed photovoltaic and network protection method and device; three sections of overcurrent protections that lock can be pressed off through direction and again, one section of zero-sequencedirectional protection, overload protection, anti-isolated island protection (two sections of under-voltage protections, two sections of overvoltage protections, two sections of underfrequency protections, two sections of height are with protection) and reverse-power protection are set.Defencive function can carry out throwing by corresponding soft pressing plate and move back.Present invention can assure that distributed photovoltaic power grid security, stable operation.
Description
Technical field
The present invention relates to photovoltaic control field, particularly a kind of distributed photovoltaic and network protection method and device.
Background technology
With the development of society and the progress of science and technology, people also increasingly increase for the demand of electric power, and traditional energy is short
Lack and power system is not turned off more while original bulk power grid centrally connected power supply is expanded an urgent demand of environmental protection
Hair utilizes new energy, strengthens the utilization of regenerative resource, forms the new powering mode that bulk power grid is combined with distributed power grid.
Active development and make full use of the green regenerative energy sources such as solar energy, and its application such as is generated electricity at the field again, be to push away
The dynamic economic fast and stable development in China, meets that effective means of the broad masses for electrical energy demands, and the current emphasis in China are built
If one of project.At present, have many advantages, such as although distributed photovoltaic power generation technology, access after bulk power grid operation to the quality of power supply
Many influences are brought with electric energy management and running.
According to State Grid Corporation of China《Distributed power source accesses power distribution network associated specifications》Regulation, distributed photovoltaic scheduling
Automated information accesses principle：" the distributed electrical source item of 10 kilovolts of accesses, upload grid-connection device state, grid entry point voltage, electricity
The real-time traffic informations such as stream, active power, reactive power and generated energy ".To meet the requirement, the grid-connected distributed photovoltaic electricity of 10kV
Design of standing must typically install grid-connected protective relaying device, protocol conversion device, telemechanical apparatus, secondary safety device, road
By equipment such as devices, numerous secondary devices causes numerous and diverse equipment secondary circuit, installation difficulty, operation maintenance workload big, and sets
Standby investment cost is high, is unfavorable for the popularization of distributed photovoltaic power generation.
Due to the new energy large-scale development in market and utilization and the political affairs of help from government photovoltaic industry in recent years at home
Plan is constantly put into effect, and substantial amounts of photovoltaic power station accesses power network.Photovoltaic power station has small scale, the spy more than quantity
Point, it is substantial amounts of to access in power network, if grid dispatching center can not will be delivered in the schedule information of power station, by the stable operation to power network
Bury potential safety hazard.Therefore, photovoltaic power station generating parameter is acquired, the implementation prison to photovoltaic power station
Control, meet that the requirement that photovoltaic generation networks becomes very necessary.
The content of the invention
The present invention is intended to provide a kind of distributed photovoltaic and network protection method and device, it is ensured that distributed photovoltaic power network pacify
Entirely, stable operation.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of grid-connected protection of distributed photovoltaic
Method, including：
Overcurrent protection：Device is provided with three-stage overcurrent protection, when any phase current values of distributed photovoltaic are more than I section of excessively stream
Setting valve (0.1~200.0A) is set, the soft pressing plate input of overcurrent protection starting element is square if this protection through not pressing off lock again
To locking, then trip and alert by T time (0.05~100.0s) delay, I section of protection act outlet of excessively stream；Work as distribution
When any phase current values of photovoltaic are more than excessively stream II sections setting setting valve (0.1~200.0A), the soft pressing plate of overcurrent protection, hard pressing plate are thrown
Enter, if this protection direction locking, is then protected not through pressing off lock again by T time (0.05~100.0s) delay, excessively stream II sections
Trip and alert in shield action outlet；When any phase current values of distributed photovoltaic be more than excessively stream III sections setting setting valve (0.1~
When 200.0A), the soft pressing plate input of overcurrent protection starting element, if this protection through not pressing off lock, direction locking, then by T again
The delay of time (0.05~100.0s), the outlet of excessively stream III sections protection act are tripped and alerted；
Zero-sequencedirectional protection：When zero-sequence current is more than I section of current setting (0.1~12.0A) of zero sequence, I section of zero sequence excessively stream
The soft pressing plate input of starting element is protected, if this protection is not blocked, by the delay of T (0.05~100.0s) times, zero sequence
Trip and alarm in I section of action outlet of excessively stream；
Overload protection：When distributed photovoltaic three-phase current maximum is more than overload setting valve (0.1~200.0A),
The soft pressing plate input of overload protection, if this protection is not blocked, by T time (0.05~100.0s) delay, overload
Trip and alarm in protection act outlet；
Under-voltage protection：When distributed photovoltaic three-phase line voltage minimum value be less than I section of setting valve of low-voltage (30.0~
380.0V), the soft pressing plate input of starting element is protected, if PT does not break or circuit breaker position is not at a point position, this protection does not have
It is blocked, then trips and alarm by the delay of T (0.1~100.0s) times, I section of protection act outlet of low-voltage；Work as distribution
When formula photovoltaic three-phase line voltage minimum value is less than low-voltage II sections setting valve (30.0~380.0V), the soft pressing plate of starting element is protected
Input, if PT does not break or circuit breaker position is not at a point position, this protection is not blocked, then by T (0.1~100.0s)
The delay of time, the outlet of low-voltage II sections protection act are tripped and alarmed；
Overvoltage protection：When distributed photovoltaic three-phase voltage maximum be more than I section of setting valve of overvoltage (100.0~
When 500.0V), the soft pressing plate input of protection starting element, if this protection is not blocked, by T time (0.1~100.0s)
Delay, I section of protection act of overvoltage trip and alarmed in outlet；When distributed photovoltaic three-phase voltage maximum is more than overvoltage II
During section setting valve (100.0~500.0V), the soft pressing plate input of protection starting element, if this protection is not blocked, by T time
The delay of (0.1~100.0s), overvoltage II sections protection act trip and alarmed in outlet；
Underfrequency protection：When the frequency of photovoltaic system is less than I section of setting valve (45~50Hz) of low frequency, I section of protection of low frequency is thrown
Enter soft pressing plate, hard pressing plate, if when three-phase minimum voltage is more than 0.3Un, this protection is not blocked, then by T time (0.1
~100.0s) delay, I section of protection act of low frequency is in outlet tripping operation and alarms；When device acquisition system frequency is less than low frequency II sections
During setting valve (45~50Hz), the protection of I section of low frequency puts into soft pressing plate, hard pressing plate, if when three-phase minimum voltage is more than 0.3Un,
This protection is not blocked, then is delayed by T time (0.1~100.0s), and low frequency II sections protection act trips and reported in outlet
It is alert；
Carrier current protection：When device acquisition system frequency is more than I section of setting valve (50~55Hz) of high frequency, I section of protection of high frequency
Soft pressing plate, hard pressing plate are put into, if this protection is not blocked, is delayed by T time (0.1~100.0s), I section of protection of high frequency
Act and trip and alarm in outlet；When device acquisition system frequency is more than high-frequency I I sections setting valve (50~55Hz), high-frequency I I
Section protection puts into soft pressing plate, hard pressing plate, if this protection is not blocked, is delayed by T time (0.1~100.0s), high frequency
II sections protection act trips and alarmed in outlet；
Reverse-power protection：As the active-power P ＜ 0 of distributed photovoltaic, and when P absolute value is more than reverse-power protection definite value
(5~300W), reverse-power protection puts into soft pressing plate, hard pressing plate, if this protection is not blocked, by T time (0.1~
Delay 100.0s), reverse-power protection, which acts, trips and alarms in outlet.
Correspondingly, present invention also offers a kind of grid-connected protection device of distributed photovoltaic, it includes：
Over-current protecting unit：For when any phase current values of distributed photovoltaic be more than I section of excessively stream setting setting valve (0.1~
When 200.0A), the soft pressing plate input of overcurrent protection, if this protection through not pressing off lock, direction locking, then by T time (0.05 again
~100.0s) delay, the outlet of I section of protection act of excessively stream, which is tripped, simultaneously to be alerted；When any phase current values of distributed photovoltaic were more than
When flowing II sections setting setting valve (0.1~200.0A), the soft pressing plate input of overcurrent protection is square if this protection through not pressing off lock again
To locking, then trip and alert by T time (0.05~100.0s) delay, the outlet of excessively stream II sections protection act；Work as distribution
When any phase current values of formula photovoltaic are more than excessively stream III sections setting setting valve (0.1~200.0A), the soft pressing plate input of overcurrent protection,
If this protection through not pressing off lock, direction locking, then by T time (0.05~100.0s) delay, the protection of excessively stream III sections again
Trip and alert in action outlet；
Zero-sequencedirectional protection unit：For being more than I section of current setting (0.1~12.0A) of zero sequence, zero sequence when zero-sequence current
The soft pressing plate input of I section of protection of excessively stream, if this protection is not blocked, by T time (0.05~100.0s) delay, zero sequence mistake
Trip and alarm in I section of action outlet of stream；
Overload protection unit：For when distributed photovoltaic three-phase current maximum be more than overload setting valve (0.1~
When 200.0A), protection puts into soft pressing plate, hard pressing plate, if this protection is not blocked, by T time (0.05~100.0s)
Delay, overload protection action outlet are tripped and alarmed；
Under-voltage protection unit：For being less than I section of setting valve of low-voltage when distributed photovoltaic three-phase line voltage minimum value
When (30.0~380.0V), protection puts into soft pressing plate, hard pressing plate, if PT does not break or circuit breaker position is not at a point position, this
Protection is not blocked, then trips and report by T time (0.1~100.0s) delay, I section of protection act outlet of low-voltage
It is alert；When distributed photovoltaic three-phase line voltage minimum value is less than low-voltage II sections setting valve (30.0~380.0V), protection input
Soft pressing plate, hard pressing plate, if PT does not break or circuit breaker position is not at a point position, this protection is not blocked, then by T time
The delay of (0.1~100.0s), the outlet of low-voltage II sections protection act are tripped and alarmed；
Overvoltage protective unit：For being more than I section of setting valve of overvoltage when distributed photovoltaic three-phase voltage maximum
When (100.0~500.0V), protection puts into soft pressing plate, hard pressing plate, if this protection is not blocked, by T time (0.1~
Delay 100.0s), I section of protection act of overvoltage trip and alarmed in outlet；When distributed photovoltaic three-phase voltage maximum is big
When overvoltage II sections setting valve (100.0~500.0V), protection puts into soft pressing plate, hard pressing plate, if this protection is not blocked,
By T time (0.1~100.0s) delay, overvoltage II sections protection act trips and alarmed in outlet；
Underfrequency protection unit：For when device acquisition system frequency is less than I section of setting valve (45~50Hz) of low frequency, low frequency
I section of protection puts into soft pressing plate, hard pressing plate, if when three-phase minimum voltage is more than 0.3Un, this protection is not blocked, then by T
Time (0.1~100.0s) is delayed, and I section of protection act of low frequency trips and alarmed in outlet；When device acquisition system frequency is less than
During low frequency II sections setting valve (45~50Hz), I section of protection of low frequency puts into soft pressing plate, hard pressing plate, if when three-phase minimum voltage is big
In 0.3Un, this protection is not blocked, then is delayed by T time (0.1~100.0s), low frequency II section protection acts are in outlet
Trip and alarm；
Carrier current protection unit：For when device acquisition system frequency is more than I section of setting valve (50~55Hz) of high frequency, high frequency
I section of protection puts into soft pressing plate, hard pressing plate, if this protection is not blocked, is delayed by T time (0.1~100.0s), high frequency
I section of protection act trips and alarmed in outlet；When device acquisition system frequency is more than high-frequency I I sections setting valve (50~55Hz),
The protection of high-frequency I I sections puts into soft pressing plate, hard pressing plate, if this protection is not blocked, prolongs by T time (0.1~100.0s)
When, high-frequency I I sections protection act trips and alarmed in outlet；
Reverse-power protection unit：For as the active-power P ＜ 0 of distributed photovoltaic, and P absolute value is protected more than inverse probability
When protecting definite value (5~300W), reverse-power protection puts into soft pressing plate, hard pressing plate, if this protection is not blocked, by T time
The delay of (0.1~100.0s), reverse-power protection, which acts, trips and alarms in outlet.
Compared with prior art, the advantageous effect of present invention is that：Present invention can assure that distributed photovoltaic power network
Safe and stable operation.
Brief description of the drawings
Fig. 1 is overcurrent protection logic diagram of the present invention；
Fig. 2 is zero-sequencedirectional protection logic diagram of the present invention；
Fig. 3 is overload protection logic diagram of the present invention；
Fig. 4 is under-voltage protection logic diagram；
Fig. 5 is overvoltage protection logic diagram；
Fig. 6 is underfrequency protection logic diagram；
Fig. 7 is carrier current protection logic diagram；
Fig. 8 is reverse-power protection logic diagram；
Fig. 9 is that inspection has pressing lock logic diagram；
Figure 10 is the grid-connected protection supervisory equipment structured flowchart of distributed photovoltaic；
Figure 11 is protection device structure chart of the present invention.
Embodiment
Its physical composition of measure and control device is divided into MCU module, analog input module, input module switch, key-press module, liquid crystal
Display module, protection module, output module, communication module, power module (see Figure 10).
1st, MCU module
The MCU module of device uses the high-performance 32-bit dsp chip that Texas Instrument provides, and data processing function is powerful, branch
Hold at least 16 road analog acquisitions and 32 road programmable digital amounts；The core of whole system operation, the signal of control device
Collection, switch control, information instruction and its distant place communication etc..
2nd, analog input module
Unit simulation input module major function is the data messages such as collection three-phase voltage, three-phase current, power, harmonic wave,
12 bit AD samples, precision are higher；On the one hand its data gathered shows source data as device information, on the other hand as electric energy
Quality analysis and the data analysis of defencive function.
3rd, input module switch
Device input module switch major function provides digital quantity for device and opened into information, gathers the switch position of line segregation
Put (unit is put or two-position is optional).
4th, key-press module
Device key-press module major function is the key-press input work(configured as device information inquiry, definite value setting, logic
Energy.
5th, liquid crystal display
The human-computer interaction interface of device information, the centralized displaying of power quality analysis and the modification of protection module parameter.
6th, protection module (see Figure 11)
Overcurrent protection, zero-sequencedirectional protection, overload protection are provided for device, underfrequency protection, height are protected with protection, low-voltage
Shield, overvoltage protection, reverse-power protection etc..
Relaying configuration is the high-precision protection of binary channels, and sampling coil passes through 12 bit AD sample line operational datas, sampled data
On the one hand comparison circuit is sent to, by judging whether to put into hard pressing plate with protecting the comparison of setting value, on the other hand transmitted
To CPU module, by the comparison with protection seting value and control word, whether the common judgement of latch-up protection decides whether to throw
Enter soft pressing plate, when hard pressing plate and soft pressing plate have any one to come into operation, protection act is in tripping and alert.
7th, module is outputed
The relay of unit protection and control action outputs module.
8th, communication module
Major function is by the data of device collection and outputs action message and produce, and supports fiber optic communication, wireless telecommunications,
9th, power module
Major function provides stable direct current 24V power supplys and 48V power supplys for device, and module is using support alternating current-direct current input
Switching Power Supply, it is AC/DC220V that input, which is surveyed, and outlet side exports for the direct current 24V and 48V of stability margin.
To ensure distributed photovoltaic power grid security, stable operation, the present invention is provided with three sections can press off lock through direction and again
Overcurrent protection, (two sections of under-voltage protections, two sections of overvoltage are protected for one section of zero-sequencedirectional protection, overload protection, the protection of anti-isolated island
Shield, two sections of underfrequency protections, two sections of height are with protection) and reverse-power protection.Defencive function can be thrown by corresponding soft pressing plate
Move back.
Overcurrent protection：If three sections of overcurrent protections, each section has independent current ration and time definite value and control word.Each section
Can independently it choose whether through pressing off lock (low-voltage and negative sequence voltage) again, if as shown in Figure 1 through direction locking, logic diagram.
When any phase current values of three-phase are more than I section of setting setting valve of excessively stream, overcurrent protection starting element starts, if this is protected
Shield through not pressing off lock again, and direction locking, by the delay of T time, I section of protection act outlet of excessively stream is tripped and alerted.Excessively stream
II section, the I section of protection of III section of relay protective scheme of excessively stream and excessively stream it is similar.
It is now to exit answering for this section of current protection that can be selected when PT breaks by control word " PT breakage lock devices excessively stream "
Pressure and direction locking become pure overcurrent protection, or the current protection is directly exited." current protection " that secondary place refers to refers to
Those have thrown the current protection section for pressing off lock or direction locking again.Lock is pressed off again also without the electricity for throwing direction locking without throwing
Stream protects section not influenceed by this control word.
Zero-sequencedirectional protection：
The present apparatus provides one section of zero-sequencedirectional protection, and zero-sequence current introduces from special zero sequence CT, logic diagram such as Fig. 2 institutes
Show.
When zero-sequence current is more than I section of current setting of zero sequence, I section of protection starting element of zero sequence excessively stream starts, if this is protected
It is not blocked, by the delay of T time, the I section of action outlet of zero sequence excessively stream is tripped and alarmed.
Overload protection：
Device one section of independent overload protection of setting, logic diagram are as shown in Figure 3.
When three-phase current maximum is more than overload setting valve, overload protection starting element starts, if this protection does not have
It is blocked, by the delay of T time, overload protection action outlet is tripped and alarmed.
Under-voltage protection：
The present apparatus sets two sections of under-voltage protections, and two sections can independently be thrown by control word and move back, logic diagram such as Fig. 4 institutes
Show.When three-phase line voltage minimum value is less than I section of setting valve of low-voltage, protection puts into soft pressing plate, hard pressing plate, if PT does not break
Or circuit breaker position is not at a point position, this protection is not blocked, then is gone out by the delay of T time, I section of protection act of low-voltage
Mouth trips and alarmed.II section of protection of low-voltage is similar.
Overvoltage protection：
The present apparatus sets two sections of overvoltage protections, and two sections can independently be thrown by control word and move back, and be acted in tripping operation, logic
Block diagram is as shown in Figure 5.
When three-phase voltage maximum is more than I section of definite value of overvoltage, protection puts into soft pressing plate, hard pressing plate, if this protection does not have
It is blocked, by the delay of T time, I section of protection act of overvoltage trips and alarmed in outlet.II section of overvoltage with it is such
Seemingly.Underfrequency protection：
The present apparatus sets two sections of underfrequency protections, and logic diagram is as shown in Figure 6.
When device acquisition system frequency is less than I section of setting valve of low frequency, I section of protection of low frequency puts into soft pressing plate, hard pressing plate, if
When three-phase minimum voltage is more than 0.3Un, this protection is not blocked, then is delayed by T time, I section of protection act of low frequency in
Trip and alarm in outlet.II section of low frequency is similar.
Carrier current protection：
The present apparatus sets two sections of carrier current protections, and logic diagram is as shown in Figure 7.
When device acquisition system frequency is more than I section of setting valve of high frequency, I section of protection of high frequency puts into soft pressing plate, hard pressing plate, if
This protection is not blocked, then is delayed by T time, and I section of protection act of high frequency trips and alarmed in outlet.II section of high frequency and this
It is similar.
Reverse-power protection：
Reverse-power protection logic diagram is as shown in Figure 8.
When device collection active-power P ＜ 0 and P absolute value are more than reverse-power protection definite value, reverse-power protection input
Soft pressing plate, hard pressing plate, if this protection is not blocked, by the delay of T time, reverse-power protection is acted in outlet tripping operation simultaneously
Alarm.
The present apparatus can pass through control word in " auxiliary parameter " " switch combined floodgate inspection has pressure to put into ", " switch automatic closing is put into "
Selection inspection has pressing lock.When " switch combined floodgate inspection has pressure to put into " control word set, only system voltage is more than 0.85Un,
Allow close a floodgate (remote control combined floodgate, local closing by hand or automatic closing), in other words, when any line voltage is less than 0.85Un, close
Sealed lock.Voltage is not examined when the control word reset, during combined floodgate.Logic diagram is as shown in Figure 9.
Claims (10)
1. a kind of distributed photovoltaic and network protection method, it is characterised in that including：
Overcurrent protection：Device is provided with three-stage overcurrent protection, when any phase current values of distributed photovoltaic are more than I section of setting of excessively stream
Setting valve, the soft pressing plate input of overcurrent protection starting element, if this protection through not pressing off lock, direction locking, then by T time again
Delay, the outlet of I section of protection act of excessively stream, which is tripped, simultaneously to be alerted；When any phase current values of distributed photovoltaic are set more than excessively stream II sections
During setting valve, the soft pressing plate of overcurrent protection, hard pressing plate input, if this protection not through pressing off lock again, direction locking, then by T when
Between delay, excessively stream II sections protection act outlet trip simultaneously alert；When any phase current values of distributed photovoltaic are more than excessively stream III sections
When setting setting valve, the soft pressing plate input of overcurrent protection starting element, if this protection direction locking, then passes through not through pressing off lock again
The delay of T time is crossed, the outlet of excessively stream III sections protection act is tripped and alerted；
Zero-sequencedirectional protection：When zero-sequence current is more than I section of current setting of zero sequence, I section of protection soft pressure of starting element of zero sequence excessively stream
Plate is put into, if this protection is not blocked, by the delay of T time, the I section of action outlet of zero sequence excessively stream is tripped and alarmed；
Overload protection：When distributed photovoltaic three-phase current maximum is more than overload setting valve, the soft pressing plate of overload protection
Input, if this protection is not blocked, by the delay of T time, overload protection action outlet is tripped and alarmed；
Under-voltage protection：When distributed photovoltaic three-phase line voltage minimum value is less than I section of setting valve of low-voltage, protection starting element is soft
Pressing plate is put into, if PT does not break or circuit breaker position is not at a point position, this protection is not blocked, then prolonging by the T1 times
When, I section of protection act outlet of low-voltage is tripped and alarmed；When distributed photovoltaic three-phase line voltage minimum value is less than low-voltage II sections
During setting valve, the soft pressing plate input of protection starting element, if PT does not break or circuit breaker position is not at a point position, this protection does not have
It is blocked, then trips and alarm by the delay of T1 times, the outlet of low-voltage II sections protection act；
Overvoltage protection：When distributed photovoltaic three-phase voltage maximum is more than I section of setting valve of overvoltage, protection starting element is soft
Pressing plate is put into, if this protection is not blocked, by the delay of T1 times, I section of protection act of overvoltage trips and reported in outlet
It is alert；When distributed photovoltaic three-phase voltage maximum is more than overvoltage II section setting valves, the soft pressing plate input of protection starting element, if
This protection is not blocked, and by the delay of T1 times, overvoltage II sections protection act trips and alarmed in outlet；
Underfrequency protection：When the frequency of photovoltaic system is less than I section of setting valve of low frequency, I section of protection of low frequency puts into soft pressing plate, hard pressure
Plate, if when three-phase minimum voltage is more than 0.3Un, this protection is not blocked, then by T1 time delayses, I section of protection of low frequency
Act and trip and alarm in outlet；When device acquisition system frequency is less than low frequency II section setting valves, I section of protection input of low frequency is soft
Pressing plate, hard pressing plate, if when three-phase minimum voltage is more than 0.3Un, this protection is not blocked, then low by T1 time delayses
Frequency II sections protection act trips and alarmed in outlet；
Carrier current protection：When device acquisition system frequency is more than I section of setting valve of high frequency, I section of protection of high frequency puts into soft pressing plate, hard pressure
Plate, if this protection is not blocked, by T1 time delayses, I section of protection act of high frequency trips and alarmed in outlet；Work as device
When acquisition system frequency is more than high-frequency I I section setting valves, the protection of high-frequency I I sections puts into soft pressing plate, hard pressing plate, if this protection not by
Locking, then trip and alarm in outlet by T1 time delayses, high-frequency I I sections protection act；
Reverse-power protection：It is inverse as the active-power P ＜ 0 of distributed photovoltaic, and when P absolute value is more than reverse-power protection definite value
Power protection puts into soft pressing plate, hard pressing plate, if this protection is not blocked, by the delay of T1 times, reverse-power protection is moved
Make in outlet to trip and alarm.
2. distributed photovoltaic according to claim 1 and network protection method, it is characterised in that I section of setting of excessively stream is adjusted
Value, excessively stream II sections setting setting valve, excessively stream III sections setting setting valve, overload setting valve are 0.1~200.0A.
3. distributed photovoltaic according to claim 1 and network protection method, it is characterised in that T=0.05~100.0s；
T1=0.1~100.0s.
4. distributed photovoltaic according to claim 1 and network protection method, it is characterised in that I section of current calibration of zero sequence
It is worth for 0.1~12.0A.
5. distributed photovoltaic according to claim 1 and network protection method, it is characterised in that I section of setting valve of low-voltage,
Low-voltage II section setting valves are 30.0~380.0V.
6. distributed photovoltaic according to claim 1 and network protection method, it is characterised in that I section of setting valve of overvoltage,
Overvoltage II section setting valves are 100.0~500.0V.
7. distributed photovoltaic according to claim 1 and network protection method, it is characterised in that it is I section of setting valve of low frequency, low
Frequency II section setting valves are 45~50Hz.
8. distributed photovoltaic according to claim 1 and network protection method, it is characterised in that high frequency I section of setting valve, height
Frequency II section setting valves are 50~55Hz.
9. distributed photovoltaic according to claim 1 and network protection method, it is characterised in that reverse-power protection definite value is
5~300W.
A kind of 10. grid-connected protection device of distributed photovoltaic, it is characterised in that including：
Over-current protecting unit：For when any phase current values of distributed photovoltaic are more than I section of excessively stream setting setting valve, overcurrent protection
Soft pressing plate input, if this protection through not pressing off lock, direction locking, then by the delay of T time, I section of protection act of excessively stream again
Trip and alert in outlet；When any phase current values of distributed photovoltaic are more than excessively stream II sections setting setting valve, the soft pressure of overcurrent protection
Plate is put into, if this protection through not pressing off lock, direction locking, then by the delay of T time, the outlet of excessively stream II sections protection act again
Trip and alert；When any phase current values of distributed photovoltaic are more than excessively stream III sections setting setting valve, the soft pressing plate of overcurrent protection is thrown
Enter, if this protection direction locking, is then jumped not through pressing off lock again by the delay of T time, the outlet of excessively stream III sections protection act
Lock simultaneously alerts；
Zero-sequencedirectional protection unit：For being more than I section of current setting of zero sequence, I section of soft pressure of protection of zero sequence excessively stream when zero-sequence current
Plate is put into, if this protection is not blocked, by the delay of T time, the I section of action outlet of zero sequence excessively stream is tripped and alarmed；
Overload protection unit：For when distributed photovoltaic three-phase current maximum is more than overload setting valve, protection to be put into
Soft pressing plate, hard pressing plate, if this protection is not blocked, by the delay of T time, overload protection action outlet is tripped and reported
It is alert；
Under-voltage protection unit：For when distributed photovoltaic three-phase line voltage minimum value is less than I section of setting valve of low-voltage, protecting
Soft pressing plate, hard pressing plate are put into, if PT does not break or circuit breaker position is not at a point position, this protection is not blocked, then is passed through
The delay of T1 times, I section of protection act outlet of low-voltage are tripped and alarmed；When distributed photovoltaic three-phase line voltage minimum value is less than
During low-voltage II section setting valves, protection puts into soft pressing plate, hard pressing plate, if PT does not break or circuit breaker position is not at a point position,
This protection is not blocked, then trips and alarm by the delay of T1 times, the outlet of low-voltage II sections protection act；
Overvoltage protective unit：For when distributed photovoltaic three-phase voltage maximum is more than I section of setting valve of overvoltage, protection to be thrown
Enter soft pressing plate, hard pressing plate, if this protection is not blocked, by the delay of T1 times, I section of protection act of overvoltage is jumped in outlet
Lock is simultaneously alarmed；When distributed photovoltaic three-phase voltage maximum is more than overvoltage II section setting valves, protection puts into soft pressing plate, hard pressure
Plate, if this protection is not blocked, by the delay of T1 times, overvoltage II sections protection act trips and alarmed in outlet；
Underfrequency protection unit：For when device acquisition system frequency is less than I section of setting valve of low frequency, I section of protection input of low frequency to be soft
Pressing plate, hard pressing plate, if when three-phase minimum voltage is more than 0.3Un, this protection is not blocked, then low by T1 time delayses
Frequently I section of protection act trips and alarmed in outlet；When device acquisition system frequency is less than low frequency II section setting valves, I section of low frequency
Protection puts into soft pressing plate, hard pressing plate, if when three-phase minimum voltage is more than 0.3Un, this protection is not blocked, then by T1 when
Between be delayed, low frequency II sections protection act in outlet trip and alarm；
Carrier current protection unit：For when device acquisition system frequency is more than I section of setting valve (50~55Hz) of high frequency, I section of high frequency
Protection puts into soft pressing plate, hard pressing plate, if this protection is not blocked, by T1 time delayses, I section of protection act of high frequency is in going out
Mouth trips and alarmed；When device acquisition system frequency is more than high-frequency I I section setting valves, the protection of high-frequency I I sections puts into soft pressing plate, hard
Pressing plate, if this protection is not blocked, by T1 time delayses, high-frequency I I sections protection act trips and alarmed in outlet；
Reverse-power protection unit：For as the active-power P ＜ 0 of distributed photovoltaic, and P absolute value is determined more than reverse-power protection
During value, reverse-power protection puts into soft pressing plate, hard pressing plate, if this protection is not blocked, by the delay of T1 times, inverse probability
Protection act trips and alarmed in outlet.
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| CN108183461A (en) * | 2018-03-05 | 2018-06-19 | 温州科宇电器有限公司 | A kind of photovoltaic plant directional current protection method and central control module |
| CN109066767A (en) * | 2018-07-09 | 2018-12-21 | 国网浙江省电力有限公司台州供电公司 | A kind of zero blind area anti-islanding protection system of low pressure distributed generation resource |
| CN111463759A (en) * | 2020-03-18 | 2020-07-28 | 广东电网有限责任公司 | Power distribution network protection setting method |
| CN115241854A (en) * | 2022-09-26 | 2022-10-25 | 国网上海能源互联网研究院有限公司 | Method and system for low-voltage distributed photovoltaic grid-connected control and protection |
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