CN107453338A - The protection investigating method and system of a kind of photovoltaic plant - Google Patents
The protection investigating method and system of a kind of photovoltaic plant Download PDFInfo
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- CN107453338A CN107453338A CN201710810560.7A CN201710810560A CN107453338A CN 107453338 A CN107453338 A CN 107453338A CN 201710810560 A CN201710810560 A CN 201710810560A CN 107453338 A CN107453338 A CN 107453338A
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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
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/46—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to frequency deviations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
-
- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00019—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using optical means
Abstract
The invention discloses the protection investigating method and system of a kind of photovoltaic plant, TT＆C system is arranged at photovoltaic plant case low pressure side；The device includes：CPU；The CPU is connected with communication module, sampling module, interchanger, power module, protection module, LCD MODULE, protocol converter.The system is used to realize electric quantity protective and non-ionizing energy loss, and electric quantity protective includes overcurrent protection, overvoltage protection and under-voltage protection.The present invention is not influenceed by observing and controlling and communication, comprehensive protection can be carried out to photovoltaic plant, it is ensured that the reliability and security of photovoltaic plant.
Description
Technical field
Become low pressure the present invention relates to photovoltaic plant case and survey overall-in-one control schema technology, the protection of particularly a kind of photovoltaic plant is surveyed
Control method and system.
Background technology
Photovoltaic plant environment compares remoter with severe, the operation of conventional photovoltaic power station and maintenance inconvenience, especially for big
The photovoltaic power plant of type, so that photovoltaic generation power is adjusted as an example, it is well known that the power output of photovoltaic inversion device is mainly by light
Lie prostrate plate and absorb what solar energy determined, power and generated energy are determined that is, intensity of illumination is stronger by intensity of illumination and light irradiation time, illumination
Duration is longer, and generated output and generated energy are bigger, if the power of photovoltaic generation can not be controlled and be adjusted, Jiu Huizao
Into very big waste.And in the prior art, photovoltaic plant can not be protected.
The content of the invention
The present invention is intended to provide the protection investigating method and system of a kind of photovoltaic plant, are effectively protected to photovoltaic plant
Shield.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of protection observing and controlling side of photovoltaic plant
Method, including electric quantity protective part and non-ionizing energy loss part；
The electric quantity protective part includes：
Overcurrent protection：After the soft pressing plate input of I section excessively streams, I section overcurrent protection functions are activated, and set excessively stream definite value
Ig, when the excessively stream definite value that the three-phase electricity flow valuve collected has an entry value to exceed definition, then relay protective scheme judges to set up, when passing through
Between T be delayed, corresponding protection exit acts and alerts；After the soft pressing plate input of II section of excessively stream, II section of overcurrent protection function is opened
With, set definite value, when the three-phase electricity flow valuve collected have an entry value exceed definition definite value when, then relay protective scheme judges into
Vertical, elapsed time T delays, corresponding protection exit is acted and alerted；
Overvoltage protection：Three-phase line voltage is taken, when maximum phase voltage is more than setting valve, relay protective scheme judges to set up, warp
Time T delays are crossed, corresponding protection exit is acted and alerted；
Frequency anomaly is protected：Frequency range is divided into two frequency bands, and f1 by two definite values f1, f2>F2, I section is
f1>F >=f2, time t1, when frequency is in [f2, f1] section, frequency I section protection acts, by the t1 protection acts that are delayed, driving dress
The power relay in input and output module is put to go to control the circuit breaker trip in outside Split type box type transformer；II section is f<
F2, time t2, when frequency is less than f2, frequency II section protection acts, be delayed t2 protection acts, drives the box change of outside Split type
Circuit breaker trip in depressor；Over frequency protection is provided only with I sections, and frequency exceeds after normal value after a delay, and driving is outside to divide
Circuit breaker trip in formula box type transformer；Judged by low-voltage dead lock software logic, voltage caused by when preventing frequency anomaly
Fluctuate and allow under-voltage protection and frequency anomaly to protect while act；
Under-voltage protection：After low-voltage soft pressing plate input, under-voltage protection function is activated, when collect three alternate
Magnitude of voltage has the overvoltage definite value that an entry value exceedes definition, and during the load current value In of electric current >=0.04 times, then relay protective scheme is sentenced
It is broken into vertical, acts corresponding protection exit, be concurrently out of order signal；
Non-ionizing energy loss：After the soft pressing plate input of non electrical quantity, non-ionizing energy loss function is activated, and is believed when collecting non electrical quantity
After number, then relay protective scheme judges to set up, and acts corresponding protection exit and alerts.
T=0~99s.
Present invention also offers a kind of protection TT＆C system of photovoltaic plant, including：
Overcurrent protection module：For after the soft pressing plate input of I section excessively streams, enabling I section overcurrent protection functions, setting is well
Definite value Ig is flowed, when the excessively stream definite value that the three-phase electricity flow valuve collected has an entry value to exceed definition, then relay protective scheme judges to set up,
Elapsed time T is delayed, and corresponding protection exit is acted and alerted；After the soft pressing plate input of II section of excessively stream, II section of overcurrent protection work(
It can be activated, set definite value, when the definite value that the three-phase electricity flow valuve collected has an entry value to exceed definition, then relay protective scheme is sentenced
It is broken into vertical, elapsed time T delays, corresponding protection exit acts and alert；
Over-voltage protection module：For taking three-phase line voltage, when maximum phase voltage is more than setting valve, relay protective scheme judges
Set up, elapsed time T delays, corresponding protection exit is acted and alerted；
Frequency anomaly protection module：Frequency range is divided into two frequency bands, and f1 by two definite values f1, f2>F2, I
Section is f1>F >=f2, time t1, when frequency is in [f2, f1] section, frequency I section protection acts, by the t1 protection acts that are delayed, drive
Power relay in dynamic device input and output module goes to control the circuit breaker trip in Split type box type transformer；II section is f<
F2, time t2, when frequency is less than f2, frequency II section protection acts, be delayed t2 protection acts, drives the box change of outside Split type
Circuit breaker trip in depressor；Over frequency protection is provided only with I sections, and frequency is acted in driving beyond normal value and after a delay
Circuit breaker trip in outside Split type box type transformer；Judged by low-voltage dead lock software logic, prevent from making during frequency anomaly
Into voltage pulsation and allow under-voltage protection and frequency anomaly to protect while act；
Under-voltage protection module：For after the soft pressing plate input of low-voltage, under-voltage protection function being enabled, when what is collected
Three alternate magnitudes of voltage have the overvoltage definite value that an entry value exceedes definition, and during the load current value In of electric current >=0.04 times, then protect
Logic judgment is set up, and acts corresponding protection exit, be concurrently out of order signal；
Non-ionizing energy loss module：It is non-when collecting for after the soft pressing plate input of non electrical quantity, enabling non-ionizing energy loss function
After electric quantity signal, then relay protective scheme judges to set up, and acts corresponding protection exit and alerts.
Present invention also offers a kind of protection TT＆C system of photovoltaic plant, the system is arranged at photovoltaic plant case and becomes low pressure
Side；The device includes：CPU；The CPU and communication module, sampling module, interchanger, power module, protection module, liquid crystal
Show module, protocol converter connection；The protection module is used to realize following guard method：
Overcurrent protection：After the soft pressing plate input of I section excessively streams, I section overcurrent protection functions are activated, and set excessively stream definite value
Ig, when the excessively stream definite value that the three-phase electricity flow valuve collected has an entry value to exceed definition, then relay protective scheme judges to set up, when passing through
Between T be delayed, corresponding protection exit acts and alerts；After the soft pressing plate input of II section of excessively stream, II section of overcurrent protection function is opened
With, set definite value, when the three-phase electricity flow valuve collected have an entry value exceed definition definite value when, then relay protective scheme judges into
Vertical, elapsed time T delays, corresponding protection exit is acted and alerted；
Overvoltage protection：Three-phase line voltage is taken, when maximum phase voltage is more than setting valve, relay protective scheme judges to set up, warp
Time T delays are crossed, corresponding protection exit is acted and alerted；
Frequency anomaly is protected：Frequency range is divided into two frequency bands, and f1 by two definite values f1, f2>F2, I section is
f1>F >=f2, time t1, when frequency is in [f2, f1] section, frequency I section protection acts, by the t1 protection acts that are delayed, driving dress
The power relay in input and output module is put to go to control the circuit breaker trip in Split type box type transformer；II section is f<F2,
Time is t2, and when frequency is less than f2, frequency II section protection acts, by the t2 that is delayed, protection act is in the outside Split type case of driving
Circuit breaker trip in formula transformer；Over frequency protection is provided only with I sections, and frequency exceeds normal value and after being delayed after a while,
Circuit breaker trip of the protection act in the outside Split type box type transformer of driving；Judged by low-voltage dead lock software logic, prevented
Only during frequency anomaly caused by voltage pulsation and allow under-voltage protection and frequency anomaly to protect while act；
Under-voltage protection：After low-voltage soft pressing plate input, under-voltage protection function is activated, when collect three alternate
Magnitude of voltage has the overvoltage definite value that an entry value exceedes definition, and during the load current value In of electric current >=0.04 times, then relay protective scheme is sentenced
It is broken into vertical, acts corresponding protection exit, be concurrently out of order signal；
Non-ionizing energy loss：After the soft pressing plate input of non electrical quantity, non-ionizing energy loss function is activated, and is believed when collecting non electrical quantity
After number, then relay protective scheme judges to set up, and acts corresponding protection exit and alerts.
Compared with prior art, the advantageous effect of present invention is that：The present invention is not influenceed by observing and controlling and communication, energy
Comprehensive protection is carried out to photovoltaic plant, protection act reliability is high, effectively prevent when failure occurs the tripping of device and
Malfunction, it is ensured that photovoltaic plant reliability of operation and security, while device is designed and developed using modularized design, Ge Gemo
Block function independently of each other and effectively cascade, maintains easily and upgrading.
Brief description of the drawings
Fig. 1 is electric quantity protective excessively stream I section schematic diagrams of the present invention；
Fig. 2 is frequency anomaly relay protective scheme block diagram of the present invention；
Fig. 3 is under-voltage protection theory diagram of the present invention；
Fig. 4 is non-ionizing energy loss theory diagram of the present invention；
Fig. 5 is protection module architecture logic block diagram of the present invention.
Fig. 6 is present system structured flowchart.
Embodiment
Protection philosophy of the present invention is as follows.
(1) electric quantity protective
The auxiliary that excessively stream I sections fast tripping protection can become low pressure survey phase fault as elimination differential protection dead band or as case is protected
Shield.The condition judged is protected to be more than device setting valve Ig, the relay protective scheme figure such as Fig. 1 institutes as maximum in load three-phase current
Show.
Protection process is that I section overcurrent protection functions are activated after device puts into I section excessively streams soft pressing plate, user according to
Scene protection needs to set excessively stream definite value Ig, as long as when the three-phase electricity flow valuve that device collects has an entry value to exceed the mistake defined
Definite value is flowed, then relay protective scheme judges to set up, elapsed time T (0~99s) delays, and device can make corresponding protection exit action simultaneously
Alarm.
II section of protection of excessively stream：
II section of protection of excessively stream is provided with single definite value (user can set), can control the protection by II section of soft pressing plate of excessively stream
Throwing move back, principle illustrates similar overcurrent I sections.
Overvoltage protection：
Overvoltage protection can be used as overvoltage startup, locking and delay cell.Protection takes three-phase line voltage, when maximum phase voltage
More than setting valve, protection acts, and the logic mechanism of the protection is similar with overcurrent I sections.
Frequency anomaly is protected：
When power system is active insufficient, low frequency can be produced.In the unexpected removal of load of power system or a lot of failures occur
When, overfrequency can be produced.Frequency range is divided into two frequency bands, and f1 by underfrequency protection by two definite values f1, f2>F2, I section
f1>During f >=f2, time t1, II section of f<The time is t2 during f2.Over frequency protection is provided only with I sections, is moved after frequency anomaly through a delay
Signal or trip.
The low locking criterion of line voltage is provided with this protection.Logic diagram is shown in Fig. 2.
During short-circuit fault of power system, the voltage of system can be made reduce, especially make the voltage of trouble point reduce more.And
Overload is electric current increase under normal operation, and voltage does not reduce.Low-voltage lockout is may be constructed for this feature
Overcurrent protection, the contact of under-voltage replay has both only been accessed in overcurrent protection loop, just connect over current protection
The outlet loop of shield makes circuit breaker trip, and under Overload, make under-voltage protection locking because voltage is normal.
After each section of soft pressing plate input, after occurrence frequency abnormal failure, corresponding protection exit is acted and alerted.
Under-voltage protection：
Under-voltage protection takes three-phase line voltage, when wantonly two phases line voltage is less than setting valve (user can set), is delayed through protection
Protection act afterwards, see Fig. 3.
Protection process is that under-voltage protection function is activated after device puts into low-voltage soft pressing plate, when device gathers
As long as to three alternate magnitudes of voltage have an overvoltage definite value that an entry value exceedes definition, and electric current >=0.04 times load current value In,
Then relay protective scheme judges to set up, and device can make corresponding protection exit action (after undervoltage tripping input), and be concurrently out of order letter
Number.
(2) non-ionizing energy loss
Device receiving magazine becomes low pressure and surveys the 220V AC signals for being transmitted through coming, and by logic judgment, realizes control breaker
Separating brake or alarm, are shown in Fig. 4.
Such as Fig. 5, protection process is that non-ionizing energy loss function is activated, and works as dress after device puts into non electrical quantity soft pressing plate
After putting the non-electric charge quantity signalling collected, then relay protective scheme judges into vertically-arranged and can act corresponding protection exit and alert.
Such as Fig. 6, the present invention realizes that header box, inverter, case become low pressure and surveyed by switch module and stipulations modular converter
Signal and the communication on Central Control Room backstage.
Device uses reinforced unit cabinet, is moved by anti-earthquake, strong jamming designs；Ensure that device is installed on inclement condition
When live, appoint and possess high reliability.No matter group screen or scattered installation need not add AC and DC input immunity module.Face
Plate includes liquid crystal display, signal lamp, operation keyboard etc..In function realization, measuring and controlling protective device mainly includes MCU moulds
Block, analog sampling module, input and output module, power module, communication module, switch module, stipulations modular converter.
(1) MCU module (i.e. CPU)
MCU module is the computing, troubleshooting, the nucleus module of communication of device, and main function is the essence of analog acquisition amount
True calculating, intake scanning, the logic judgment of protective number, device Communication processing, data storage etc., during being plant running
Various information exchanges and input and output and its core of all control commands, CPU use STM32F407 chips, performance is powerful,
It is powerful.
(2) analog sampling module (i.e. sampling module)
Device is equipped with 18 road ac analog sampling channels and 6 road DC analogue quantity samplings.Major function is device pair
Split type case become low pressure survey IA1, IB1 of two-way three-phase alternating current, IC1, Ua1, Ub1, Uc1, IA2, IB2, IC2, Ua2, Ub2,
The filtering of analog quantity such as Uc2, power factor COS ф, active-power P, reactive power Q and sensor 4-20mA DC quantity signals and
Sampling.Module includes alternating current and direct current analog quantity sampled measurements circuit, and case is become to three-phase alternating voltage, electric current and the biography of low pressure survey
Sensor DC quantity is converted to weak electric signal, is conveyed to MCU module and is AD converted, and is calculated accurately by accurate in MCU
Value, and be shown on liquid crystal display.
(3) protection module
Device configure 40 tunnels open into detection case become inside grave gas, light gas, superhigh temperature, high temperature, oil level is low, pressure is different
Signal is often waited, and is equipped with the relay outlet that 10 tunnels can be independently programmable, light, grave gas tripping operation can be controlled, superelevation, warm high temperature are jumped
Lock, the low tripping operation of oil level, pressure anomaly tripping operation etc. (all signal outlet tripping operations alert optional), realizes non-ionizing energy loss；Excessively stream
One section of tripping operation, two sections of tripping operations of excessively stream, overvoltage tripping, undervoltage tripping, frequency anomaly tripping operation etc., realize electric quantity protective.Tripping operation
Exit circuit mainly provides measure and control device trip(ping) circuit, and the control breaker for power station provides tripping operation outlet when a failure occurs.
(4) power module
Power module by case become in the AC220V power source transitions that provide inputted into DC24V, then by DC-DC circuit decompression into
DC12V, DC5V, DC3.3V, powered respectively to protocol module, switch module, analog sampling circuit module, MCU module etc..
(5) stipulations modular converter
Header box, inverter and case low pressure side signal are transferred to survey by 485 differential signal lines using Modbus agreements
Device is controlled, device is internally integrated independent stipulations modular converter, realizes Modbus agreements and 103/104IEC60870-5-103/
After 104 protocol conversions, monitoring power station room and power office backstage are scheduled in unification.
(6) switch module
Device is internally integrated independent switch module, realizes the interconnection of network interface and optical port, makes device flexibly and easily each
Individual functional module is organic and is independently associated together.
(7) communication module
Being combined by CPU, protocol converter and switch function, device provides 485 communications, using MODBUS stipulations,
485 differential signal lines are become by case and gather header box, inverter drive signal.It is real by switch module optical port, network interface translation function
The interconnection of existing protocol module and switch module, between each measure and control device, by interchanger, with 2 road optical fiber, realize self-healing light
Fine Ethernet ring.By stipulations modular converter, MODBUS stipulations agreements are turned IEC60870-5-104 stipulations agreements, pass through optical fiber
Looped network communicates with backstage Central Control Room.Device provides 4 road RS485 communication interfaces；2 groups of optical fiber interfaces, optical fiber interface 10/100Base-
FX (optical port), single mode, multimode are optional, standard SC interfaces；2 road RJ45 ethernet communication interfaces.
(8) key-press module
Device key-press module major function is inquires about as device information, definite value is set, the key-press input work(of relaying configuration
Energy.
(9) liquid crystal display
The human-computer interaction interface of centralized displaying and the parameter modification of device information.
Claims (5)
1. the protection investigating method of a kind of photovoltaic plant, it is characterised in that including electric quantity protective part and non-ionizing energy loss part；
The electric quantity protective part includes：
Overcurrent protection：After the soft pressing plate input of I section excessively streams, I section overcurrent protection functions are activated, and set excessively stream definite value Ig,
When the excessively stream definite value that the three-phase electricity flow valuve collected has an entry value to exceed definition, then relay protective scheme judges to set up, elapsed time T
Delay, corresponding protection exit are acted and alerted；After the soft pressing plate input of II section of excessively stream, II section of overcurrent protection function is activated,
Definite value is set, when the definite value that the three-phase electricity flow valuve collected has an entry value to exceed definition, then relay protective scheme judges to set up, warp
Time T delays are crossed, corresponding protection exit is acted and alerted；
Overvoltage protection：Three-phase line voltage is taken, when maximum phase voltage is more than setting valve, relay protective scheme judges to set up, when passing through
Between T be delayed, corresponding protection exit acts and alerts；
Frequency anomaly is protected：Frequency range is divided into two frequency bands, and f1 by two definite values f1, f2>F2, I section is f1>f
>=f2, time t1, when frequency f is in [f2, f1] section, frequency I section protection acts, by the t1 protection acts that are delayed, drive device
Power relay in input and output module goes to control the circuit breaker trip in outside Split type box type transformer；II section is f<
F2, time t2, when frequency is less than f2, frequency II section protection acts, be delayed t2 protection acts, drives the box change of outside Split type
Circuit breaker trip in depressor；Over frequency protection is provided only with I sections, and frequency exceeds after normal value after a delay, and driving is outside to divide
Circuit breaker trip in formula box type transformer；Judged by low-voltage dead lock software logic, voltage caused by when preventing frequency anomaly
Fluctuate and allow under-voltage protection and frequency anomaly to protect while act；
Under-voltage protection：After the soft pressing plate input of low-voltage, under-voltage protection function is activated, when three voltages between phases collected
Value has the overvoltage definite value that an entry value exceedes definition, and during the load current value In of electric current >=0.04 times, then relay protective scheme judges into
It is vertical, act corresponding protection exit, be concurrently out of order signal；
Non-ionizing energy loss：After non electrical quantity soft pressing plate input, non-ionizing energy loss function is activated, when collecting non-electric charge quantity signalling
Afterwards, then relay protective scheme judges to set up, and acts corresponding protection exit and alerts.
2. the protection investigating method of photovoltaic plant according to claim 1, it is characterised in that T=0~99s.
A kind of 3. protection TT＆C system of photovoltaic plant, it is characterised in that including：Overcurrent protection module：For I section excessively streams
After soft pressing plate input, I section overcurrent protection functions are enabled, set excessively stream definite value Ig, when the three-phase electricity flow valuve collected has one
When value is more than the excessively stream definite value defined, then relay protective scheme judges to set up, elapsed time T delays, and corresponding protection exit action is simultaneously
Alarm；After the soft pressing plate input of II section of excessively stream, II section of overcurrent protection function is activated, and sets definite value, when the three-phase collected
When current value has the definite value that an entry value exceedes definition, then relay protective scheme judges to set up, and elapsed time T delays, protects out accordingly
Mouth is acted and alerted；Over-voltage protection module：For taking three-phase line voltage, when maximum phase voltage is more than setting valve, protection is patrolled
Collect and judge to set up, elapsed time T delays, corresponding protection exit is acted and alerted；
Frequency anomaly protection module：Frequency range is divided into two frequency bands, and f1 by two definite values f1, f2>F2, I section is
f1>F >=f2, time t1, when frequency is in [f2, f1] section, frequency I section protection acts, by the t1 protection acts that are delayed, driving dress
The power relay in input and output module is put to go to control the circuit breaker trip in Split type box type transformer；II section is f<F2,
Time is t2, and when frequency is less than f2, frequency II section protection acts, be delayed t2 protection acts, drives outside Split type box-type transformation
Circuit breaker trip in device；Over frequency protection is provided only with I sections, and frequency acts outer in driving beyond normal value and after a delay
Circuit breaker trip in portion's Split type box type transformer；Judged by low-voltage dead lock software logic, prevent from causing during frequency anomaly
Voltage pulsation and allow under-voltage protection and frequency anomaly to protect while act；
Under-voltage protection module：For after the soft pressing plate input of low-voltage, under-voltage protection function being enabled, when the three-phase collected
Between magnitude of voltage have the overvoltage definite value that an entry value exceedes definition, and during the load current value In of electric current >=0.04 times, then relay protective scheme
Judge to set up, act corresponding protection exit, be concurrently out of order signal；
Non-ionizing energy loss module：For after non electrical quantity soft pressing plate input, enabling non-ionizing energy loss function, when collecting non electrical quantity
After signal, then relay protective scheme judges to set up, and acts corresponding protection exit and alerts.
4. the protection TT＆C system of photovoltaic plant according to claim 3, it is characterised in that T=0~99s.
5. the protection TT＆C system of a kind of photovoltaic plant, it is characterised in that the system is arranged at photovoltaic plant case low pressure side；Should
Device includes：CPU；The CPU and communication module, sampling module, interchanger, power module, protection module, liquid crystal display mode
Block, protocol converter connection；The protection module is used to realize following guard method：
Overcurrent protection：After the soft pressing plate input of I section excessively streams, I section overcurrent protection functions are activated, and set excessively stream definite value Ig,
When the excessively stream definite value that the three-phase electricity flow valuve collected has an entry value to exceed definition, then relay protective scheme judges to set up, elapsed time T
Delay, corresponding protection exit are acted and alerted；After the soft pressing plate input of II section of excessively stream, II section of overcurrent protection function is activated,
Definite value is set, when the definite value that the three-phase electricity flow valuve collected has an entry value to exceed definition, then relay protective scheme judges to set up, warp
Time T delays are crossed, corresponding protection exit is acted and alerted；
Overvoltage protection：Three-phase line voltage is taken, when maximum phase voltage is more than setting valve, relay protective scheme judges to set up, when passing through
Between T be delayed, corresponding protection exit acts and alerts；
Frequency anomaly is protected：Frequency range is divided into two frequency bands, and f1 by two definite values f1, f2>F2, I section is f1>f
>=f2, time t1, when frequency is in [f2, f1] section, frequency I section protection acts, by the t1 protection acts that are delayed, drive device is opened
Enter the power relay outputed in module to go to control the circuit breaker trip in Split type box type transformer；II section is f<F2, time
For t2, when frequency is less than f2, frequency II section protection acts, by the t2 that is delayed, protection act is in the box change of the outside Split type of driving
Circuit breaker trip in depressor；Over frequency protection is provided only with I sections, and frequency is beyond normal value and after being delayed after a while, protection
Act the circuit breaker trip in the outside Split type box type transformer of driving；Judged by low-voltage dead lock software logic, prevent frequency
Voltage pulsation caused by during rate exception and allow under-voltage protection and frequency anomaly to protect while act；
Under-voltage protection：After the soft pressing plate input of low-voltage, under-voltage protection function is activated, when three voltages between phases collected
Value has the overvoltage definite value that an entry value exceedes definition, and during the load current value In of electric current >=0.04 times, then relay protective scheme judges into
It is vertical, act corresponding protection exit, be concurrently out of order signal；
Non-ionizing energy loss：After non electrical quantity soft pressing plate input, non-ionizing energy loss function is activated, when collecting non-electric charge quantity signalling
Afterwards, then relay protective scheme judges to set up, and acts corresponding protection exit and alerts.
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| CN201710810560.7A CN107453338A (en) | 2017-09-11 | 2017-09-11 | The protection investigating method and system of a kind of photovoltaic plant |
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Cited By (1)
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|---|---|---|---|---|
| CN110350490A (en) * | 2019-07-30 | 2019-10-18 | 南京南电继保自动化有限公司 | Intelligent box becomes protection measurement and control integration device |
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