CN105305637B - A kind of grid-connected warning system of distributed generation resource and its operation method - Google Patents
A kind of grid-connected warning system of distributed generation resource and its operation method Download PDFInfo
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Abstract
The present invention relates to a kind of grid-connected warning system of distributed generation resource and its operation methods; including photovoltaic module, inverter, no-voltage trip breaker, disconnecting link, grid-connected electric energy meter, alarm device, earth leakage circuit breaker; inverter, no-voltage trip breaker, grid-connected electric energy meter, alarm device, earth leakage circuit breaker are sequentially connected, and no-voltage trip breaker connects grid-connected electric energy meter by disconnecting link；Alarm device includes main control MCU and the information acquisition module being connect with main control MCU, electric voltage exception alarm module, frequency variation alarm module, display module, uplink communication module, memory module and power module.When the present invention is run; earth leakage circuit breaker is connected into grid side; when grid side decompression or frequency variation are more than a certain range; the alarm device can send a warning message and notify administrative staff; it goes to check Grid-connected Distributed Generation Power System equipment operation condition, safety that is wider, improving power grid, equipment and operation management personnel in degree.
Description
Technical field
The present invention relates to a kind of grid-connected warning system of distributed generation resource and its operation methods, belong to the grid-connected inspection of distributed generation resource
Survey technology field.
Background technology
As country is higher and higher to the popularization of new energy and the popularity used, safe and orderly management how is ensured
Power generation client becomes the important topic that electric company faces.
Currently, most study is the distributed generation resource grid-connected influence to power system operating mode and island detection method later
Research, still, for operation maintenance personnel's safety management details facilitate consider it is very few.Distributed power grid Shen in 2015
Please be in eruptive growth, due to the particularity of mounting condition, the overwhelming majority is small towns family distributed power generation project, and region is crossed over
Property it is big, dispersibility is strong, management is upper situations such as omission, obscure easily occurs, in conjunction with industry development and each management unit to power generation user
Actual management condition, difficult point are not notifying the administrative staff in power generation project location at the first time, in power grid
Increase the risk of the safety accidents such as anti-power transmission, maloperation when interruption maintenance.
Chinese patent literature CN102116816A discloses a kind of distributed generation resource and is incorporated into the power networks monitoring device, including signal
Acquisition module, signal processing module and management control module；The signal acquisition module acquisition distributed power grid and main power grid
Voltage and current；The signal processing module calculates electric parameter according to voltage and current；The management control module is received, is deposited
The electric parameter is stored up, and is incorporated into the power networks to distributed power grid according to the electric parameter and is managed and controls.The present invention measures simultaneously
The voltage and current of distributed power grid and main power grid at network interface is accurately calculated using pretreatment and high-speed digital video camera
The electric parameter for going out distributed power grid and main power grid is incorporated into the power networks to distributed generation resource according to electric parameter and is monitored, manages and controls
System has grasped the actual static and dynamic behaviour of power distribution network and has ensured power distribution network so as to instruct power grid security, economical operation
Stability and safety.But the patent has the following defects：(1) detection electric current is unable to the electric energy of significant reaction electrical breakdown
Quality change situation, because when grid cut-off, distributed generation resource still may normally power to the load, and at this moment curent change is very
It is small, so cannot function as basis for estimation；(2) do not have low-voltage crossing ability, frequency response ability.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of grid-connected warning systems of distributed generation resource；
The present invention also provides the operation methods of the grid-connected warning system of above-mentioned distributed generation resource；
The present invention can monitor the operating condition of all grid-connected distributed generation resources in real time, have anti-islanding detection and alarm
Function, accuracy of detection is high, and check frequency is small, and alarm is accurate, timely, safe.It can be at the first time when grid power blackout overhauls
It notifies the administrative staff of project location, disconnects grid-connected side tool lock in time, ensure that the safety of service personnel and power grid.
Term is explained
1, WDT is the abbreviation letter of English Watchdog Timer.Watchdog Timer Chinese name house dogs.It is one
A timer circuit, it is general there are one input, it cries and feeds dog, an end RST for being output to MCU, when MCU is worked normally, often
A signal is exported to dog end is fed every a period of time, is reset to WDT, if it exceeds the defined time does not feed dog, (generally in program
When running winged), WDT timings are more than that will provide a reset signal to MCU, so that MCU is resetted, prevent MCU from crashing, house dog
Effect is exactly to prevent program from endless loop occurs, in other words program fleet.
2, isolated island, i.e. island effect refer to being incorporated to electricity in the case where scheduled outage or unplanned power failure occur for power grid
The power generator of net cannot detect or at all without corresponding detection means, still feed electricity to power grid.
The technical scheme is that：
A kind of grid-connected warning system of distributed generation resource, including photovoltaic module, inverter, no-voltage trip breaker, disconnecting link, simultaneously
Net electric energy meter, alarm device, earth leakage circuit breaker, the photovoltaic module, the inverter, the no-voltage trip breaker,
The grid-connected electric energy meter, the alarm device, the earth leakage circuit breaker are sequentially connected, and the no-voltage trip breaker passes through
The disconnecting link connects the grid-connected electric energy meter；The alarm device includes that main control MCU and the information being connect with the main control MCU are adopted
Collect module, electric voltage exception alarm module, frequency variation alarm module, display module, uplink communication module, memory module and power supply
Module.
According to currently preferred, described information acquisition module for obtaining grid side voltage value u and frequency values f simultaneously in real time
It is sent to the main control MCU in real time, the grid side voltage value u obtained in real time and frequency values f, which are also sent to display module, shows；
The main control MCU real-time judge：Whether beyond voltage normal operation threshold value U, whether frequency values f is normal beyond frequency by voltage value u
Operation threshold F sends alarm command to the electric voltage exception and accuses when judging that voltage value U exceeds voltage normal operation threshold value U
Alert module；When frequency values f exceeds frequency normal operation threshold value F, sends alarm command to the frequency and change alarm module；Institute
Electric voltage exception alarm module is stated to be used for：After receiving alarm command, information warning is sent to pipe by the uplink communication module
Reason personnel；The frequency variation alarm module is used for：After receiving alarm command, is sent and warned by the uplink communication module
Information is to administrative staff；The memory module is used for：The grid side voltage value u and frequency that storage information acquisition module obtains in real time
Value f, the operation program and all alarms record, the value range of the F for storing the alarm device are：49.5-50.2Hz,
The value range of the U is：85%UN- 110%UN, UNIt refer to rated voltage.
When the present invention is run, the earth leakage circuit breaker is connected into grid side, when grid side decompression or frequency change
When more than a certain range, which, which can send a warning message, notifies administrative staff, and administrative staff go according to warning information
It checks Grid-connected Distributed Generation Power System equipment operation condition, power grid, equipment and operation management people is improved in wider, degree
The safety of member.Moreover, when inverter has anti-isolated island monitoring blind area or the anti-isolated island disabler of inverter, that is, at certain
Its akinesia in a range, can not achieve anti-isolated island defencive function, which can make up the defect and realize that two level is anti-
Isolated island monitoring function.
According to currently preferred, described information acquisition module includes A/D converter；The display module is LED dot matrix
Liquid crystal display；The uplink communication module is GPRS/CDMA wireless modules, ethernet module or optical fiber (EPON) module；Institute
It is NOR FLASH to state memory module；The power module is AC/DC Switching Power Supplies, and the AC/DC Switching Power Supplies connect power grid
Side.
Collected grid side voltage value u and frequency values f digital informations number are converted into simulation letter by A/D converter
Number, analog signal is sent to main control MCU.
The uplink communication module uses modularized design, and there is module type to identify position, can automatic identification different type
Module, support warm connection function；
Electric main is converted to low-voltage DC by AC/DC Switching Power Supplies, and power supply is provided for the alarm device.Width funtion
Range inputs, and adapts to tri- kinds of voltage specifications of 57.7/220/380V.By the voltage transformer Sample AC voltage of isolation, realize
Alternating voltage monitoring function.
According to currently preferred, the alarm device further includes：Clock unit circuit, electric power management circuit, WDT electricity
Road, temperature sensing circuit and ESAM encrypted circuits, the clock unit circuit, the electric power management circuit, the WDT circuits,
The temperature sensing circuit and the ESAM encrypted circuits are separately connected the main control MCU.
Clock unit circuit provides the clock time that operation needs for alarm device and provides lithium battery using automatic temperature compensation
The normal operation of clock when maintaining to have a power failure, cell voltage is under-voltage to be alerted；Electric power management circuit provides main control MCU operation and needs
Various DC voltages, support system blackout report；WDT circuits ensure the normal power-up initializing of main control MCU, monitoring alarm dress
The unusual condition of the operation and monitor alarm device voltage set；Temperature sensing circuit detects the environment temperature of alarm device, for meter
The accuracy compensation of amount sampling provides temperature parameter, ensures measuring accuracy of alarm device in the range of -40~+75 DEG C；ESAM
Encrypted circuit realizes the encryption function of communication packet.
According to currently preferred, the main control MCU connection infrared interface.
The advantage designed herein is there is infrared communication.Infrared communication circuit is modulation far infrared, realizes and ties up
Protect the communication function of palm PC.
According to currently preferred, the main control MCU connection communication interface unit, the communications interface unit includes
RS485 telecommunication circuits.
The advantage designed herein is：Communications interface unit provides local communication channel, including RS485 telecommunication circuits, distant
Believe circuit etc..RS485 telecommunication circuits select technical grade 485 chip (can anti-human bulk-mode ± 15KV electrostatic), three tunnels, 485 circuit with
Main system circuit is all made of the communication modes of light-coupled isolation, has overcurrent, over-voltage protecting function.Terminal provides 1 tunnel remote signalling input,
The signal transmission with MCU is realized by the way of light-coupled isolation, is realized respectively using current-limiting resistance and TVS at signal access
Stream, overvoltage protection.
The operation method of the above-mentioned grid-connected warning system of distributed generation resource, specific steps include：
(1) described information acquisition module obtains grid side voltage value u and frequency values f and is sent to the master control in real time in real time
At the same time the grid side voltage value u obtained in real time and frequency values f are sent to display module and shown by MCU；
(2) whether the main control MCU real-time judge voltage value u exceeds the value model of voltage normal operation threshold value U, the U
Enclose for：85%UN- 110%UN, when judging that voltage value U exceeds voltage normal operation threshold value U, alarm command is sent to described
Electric voltage exception alarm module, otherwise, return to step (1)；At the same time, whether the main control MCU real-time judge frequency values f exceeds
Frequency normal operation threshold value F, the value range of the F are：49.5-50.2Hz, when frequency values f exceeds frequency normal operation threshold value
When F, sends alarm command to the frequency and change alarm module, otherwise, return to step (1)；
(3) it when the electric voltage exception alarm module receives alarm command, is sent and is warned by the uplink communication module
Show information to administrative staff；When frequency variation alarm module receives alarm command, pass through the uplink communication module
Information warning is sent to administrative staff.
Beneficial effects of the present invention are：
1, when present invention operation, the earth leakage circuit breaker is connected into grid side, when grid side decompression or frequency become
Change when being more than a certain range, which, which can send a warning message, notifies administrative staff, administrative staff according to warning information,
It goes to check Grid-connected Distributed Generation Power System equipment operation condition, power grid, equipment and operation management is improved in wider, degree
The safety of personnel.
2, inverter has anti-isolated island monitoring blind area or the anti-isolated island disabler of inverter, that is, within the scope of some
Its akinesia cannot also realize that anti-isolated island defencive function, the alarm device can make up the defect and realize the anti-isolated island prison of two level
Brake.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the structure diagram of alarm device of the present invention.
Fig. 3 is the structure diagram of alarm device described in embodiment 2.
Fig. 4 is operation method flow chart of the present invention.
In Fig. 1-4,1, photovoltaic module, 2, inverter, 3, no-voltage trip breaker, 4, disconnecting link, 5, grid-connected electric energy meter, 6, accuse
Alarm device, 7, earth leakage circuit breaker, 8, main control MCU, 9, information acquisition module, 10, electric voltage exception alarm module, 11, frequency
Change alarm module, 12, display module, 13, uplink communication module, 14, memory module, 15, power module, 16, clock unit
Circuit, 17, electric power management circuit, 18, WDT circuits, 19, temperature sensing circuit, 20, ESAM encrypted circuits.
Specific implementation mode
The present invention is further qualified with embodiment with reference to the accompanying drawings of the specification, but not limited to this.
Embodiment 1
A kind of grid-connected warning system of distributed generation resource, including photovoltaic module 1, inverter 2, no-voltage trip breaker 3, disconnecting link
4, grid-connected electric energy meter 5, alarm device 6, earth leakage circuit breaker 7, the photovoltaic module 1, the inverter 2, the decompression are de-
Button breaker 3, the grid-connected electric energy meter 5, the alarm device 6, the earth leakage circuit breaker 7 are sequentially connected, the decompression
Trip circuit breaker 3 connects the grid-connected electric energy meter 5 by the disconnecting link 4；The alarm device 6 include main control MCU 8 and with it is described
Main control MCU 8 connect information acquisition module 9, electric voltage exception alarm module 10, frequency variation alarm module 11, display module 12,
Uplink communication module 13, memory module 14 and power module 15.As shown in Figure 1.
No-voltage trip breaker 3 is used for：Network voltage reduces excessive (under-voltage) when grid power blackout or for some reason
When, distributed generation resource can be made to be cut off from power grid, play the role of under-voltage and zero voltage protection, when network voltage restores, decompression is de-
Button breaker 3 is also at off-state, it is necessary to which manual operation can just close disconnecting link 4, ensure personal safety and equipment safety.
After no-voltage trip breaker 3 plus the effect of disconnecting link 4 is being overhauled according to safety code requirement in overhaul of the equipments
Apparent cut-off point is formed between equipment and charging equipment, ensures the personal safety of maintenance construction personnel.
Earth leakage circuit breaker 7 is mounted on grid side, when electric leakage occurs and gets an electric shock, and reaches and is acted defined by protection
When electric current, action auto power off is protected within the time of restriction.
The main control MCU 8 is completed at the same time sampling and calculates, and stores and communicates, can support on-line maintenance, use state
13 standard agreement of net ----meet acquisition stipulations of state's net to terminal.
(1) it is based on ARM 32-bit Cortex-M3 processors, dominant frequency highest 120MHz, when high-speed cruising can reach
The processing capacity of 150DMIPS
(2) processor embeds 512KB Flash, 128+4KByte SRAM.
(3) lower dynamic power consumption, 188uA/MHz:From on piece flash memory with 120MHz full speed runnings, power consumption is only
22.5mA。
(4) FSMC interfaces, flexible high speed outer memory interface, for extending chip external memory and peripheral hardware
(5) outstanding real-time performance, real-time flash memory accelerometer.Adaptive flash memory accelerometer in real time makes STM32F2
Code can be executed with the high speed zero-waiting of 120MHz on flash memory in piece, to play the property of Cortex-M3 ultimate attainmently
Energy.
(6) the high-performance peripheral hardware of more innovations with flexibility, supports the USB OTG of high-speed mode, video sensor interface.
(7) flexible static memory interface, rate are up to 60MHz.
(8) 2 32 timers, the multi-functional RTC32 bit timings device with calendar function.
(9) communication interface of higher speed, 3 12 ADC module, sample rate are up to 2M/ seconds.
(10) overturning rate is up to 82 GPIO of 60MHz.
Described information acquisition module 9 for obtaining grid side voltage value u and frequency values f and being sent to the master in real time in real time
MCU8 is controlled, the grid side voltage value u obtained in real time and frequency values f are also sent to display module 12 and shown；The main control MCU 8
Whether real-time judge voltage value u exceeds whether voltage normal operation threshold value U, frequency values f exceed frequency normal operation threshold value F, when
When judging that voltage value U exceeds voltage normal operation threshold value U, alarm command is sent to the electric voltage exception alarm module 10；When
When frequency values f exceeds frequency normal operation threshold value F, sends alarm command to the frequency and change alarm module 11；The voltage
Abnormality alarming module 10 is used for：After receiving alarm command, information warning is sent to management by the uplink communication module 13
Personnel；The frequency variation alarm module 11 is used for：After receiving alarm command, is sent and warned by the uplink communication module 13
Show information to administrative staff；The memory module 14 is used for：The grid side voltage value u that storage information acquisition module 9 obtains in real time
And frequency values f, the operation program and all alarms record, the value range of the F for storing the alarm device 6 are：49.5-
The value range of 50.2Hz, the U is：85%UN- 110%UN, UNIt refer to rated voltage.
When the present invention is run, the earth leakage circuit breaker 7 is connected into grid side, when grid side decompression or frequency change
When more than a certain range, which, which can send a warning message, notifies administrative staff, administrative staff according to warning information,
It goes to check Grid-connected Distributed Generation Power System equipment operation condition, power grid, equipment and operation management is improved in wider, degree
The safety of personnel.Moreover, when inverter is with anti-isolated island monitoring blind area or the anti-isolated island disabler of inverter, that is,
Its akinesia within the scope of some can not achieve anti-isolated island defencive function, which can make up the defect and realize two level
Anti- isolated island monitoring function.
Described information acquisition module 9 includes A/D converter；The display module 12 is LED lattice lcd display；It is described
Uplink communication module 13 is GPRS/CDMA wireless modules, ethernet module or optical fiber (EPON) module；The memory module 14 is
NOR FLASH；The power module 15 is AC/DC Switching Power Supplies, and the AC/DC Switching Power Supplies connect grid side.
Collected grid side voltage value u and frequency values f digital informations number are converted into simulation letter by A/D converter
Number, analog signal is sent to main control MCU 8.
The working status indication of alarm device 6 may be implemented in display module 12, and working status indication includes：Running indicator, announcement
8 indicator lights such as warning lamp, online lamp, signal strength indicator light, LINK lamps, DATA lamps, remote lamp and this floor-lamp, indicate respectively announcement
The presence in the uplink communication channel of the generation of the current operating conditions, alarm event of alarm device 6 and record, alarm device 6,
The signal strength in current uplink communication channel, the linking status of Ethernet, the data interaction of Ethernet, remote communication module are led to
The communications status of letter state and local communication interface.
Display module 12 can show grid side voltage (precision of 1V) and grid side frequency (0.2Hz precision), usually with every 3
Second wheel is aobvious primary, aobvious primary per second wheel when occurring abnormal, can be to all item datas of ammeter copy reading (3 phase) in external ammeter.
The uplink communication module 13 uses modularized design, and there is module type to identify position, can automatic identification inhomogeneity
The module of type supports warm connection function；
Electric main is converted to low-voltage DC by AC/DC Switching Power Supplies, and power supply is provided for the alarm device 6.Wide electricity
Range input is pressed, tri- kinds of voltage specifications of 57.7/220/380V are adapted to.It is real by the voltage transformer Sample AC voltage of isolation
Existing alternating voltage monitoring function.
Warning system described in the present embodiment uses technical grade Cortex-M3 Series Controllers and embedded real-time operation system
System, is completed at the same time sampling and calculates, and stores and communicates, can support on-line maintenance, use 13 standard agreement of state's net ---
Meet acquisition stipulations of state's net to terminal.It is excellent with Electro Magnetic Compatibility, reliability is high, volume is light and handy, the spies such as easy for installation
Point.
Warning system described in the present embodiment is applied to TLY2230 molded line road.
Embodiment 2
According to a kind of grid-connected warning system of distributed generation resource described in embodiment 1, difference lies in the alarm device is also
Including：Clock unit circuit 16, electric power management circuit 17, WDT circuits 18, temperature sensing circuit 19 and ESAM encrypted circuits 20,
The clock unit circuit 16, the electric power management circuit 17, the WDT circuits 18, the temperature sensing circuit 19 and described
ESAM encrypted circuits 20 are separately connected the main control MCU 8.
Clock unit circuit 16 is the clock time that alarm device 6 provides that operation needs, and using automatic temperature compensation, provides lithium electricity
The normal operation of clock when pond maintains to have a power failure, cell voltage is under-voltage to be alerted；Electric power management circuit 17 provides main control MCU 8 and transports
The various DC voltages that row needs support system blackout to report；WDT circuits 18 ensure the normal power-up initializing of main control MCU 8,
The operation of monitoring alarm device 6 and the unusual condition of 6 voltage of monitor alarm device；Temperature sensing circuit 19 detects alarm device 6
Environment temperature, the accuracy compensation for metering sampling provides temperature parameter, ensures alarm device 6 in the range of -40~+75 DEG C
Measuring accuracy；ESAM encrypted circuits 20 realize the encryption function of communication packet.
Embodiment 3
A kind of operation method of the grid-connected warning system of distributed generation resource described in embodiment 2, specific steps include：
(1) described information acquisition module 9 obtains grid side voltage value u and frequency values f and is sent to the master in real time in real time
At the same time the grid side voltage value u obtained in real time and frequency values f are sent to display module 12 and shown by control MCU8；
(2) whether 8 real-time judge voltage value u of the main control MCU exceeds voltage normal operation threshold value U, when judging voltage
When value U exceeds voltage normal operation threshold value U, alarm command is sent to the electric voltage exception alarm module 10, grid side voltage takes
It is worth range and corresponding 10 response time of electric voltage exception alarm module is as shown in table 1, otherwise, return to step (1)；At the same time,
Whether 8 real-time judge frequency values f of the main control MCU exceeds frequency normal operation threshold value F, grid side frequency value range and correspondence
Frequency variation 11 response time of alarm device it is as shown in table 2, when frequency values f exceed frequency normal operation threshold value F when, send accuse
Alert instruction to the frequency changes alarm module 11, otherwise, return to step (1)；
Table 1
| Grid side voltage u | The electric voltage exception alarm module response time/s |
| 20%UN≤ U ＜ 50%UN | 0.1 |
| 50%UN≤ U ＜ 85%UN | 2.0 |
| 85%UN≤ U ＜ 110%UN | Normal operation |
| 110%UN≤ U ＜ 135%UN | 2.0 |
| 135%UN≤U | 0.05 |
Table 2
| Grid side frequency f/Hz | Frequency changes alarm device response time/s |
| f≤48 | 0.2s |
| 48 f≤49.5 ＜ | 10min |
| 49.5≤f≤50.2 | Normal operation |
| 50.2 f≤50.5 ＜ | 2min |
| F ＞ 50.5 | 0.2s |
(3) it when the electric voltage exception alarm module 10 receives alarm command, is sent out by the uplink communication module 13
Send information warning to administrative staff；It is logical by the uplink when frequency variation alarm module 11 receives alarm command
Believe that module 13 sends information warning to administrative staff.As shown in Figure 4.
Claims (3)
1. a kind of operation method of the grid-connected warning system of distributed generation resource, which is characterized in that including photovoltaic module, inverter, mistake
Press trip circuit breaker, disconnecting link, grid-connected electric energy meter, alarm device, earth leakage circuit breaker, the photovoltaic module, the inverter,
The no-voltage trip breaker, the grid-connected electric energy meter, the alarm device, the earth leakage circuit breaker are sequentially connected, institute
It states no-voltage trip breaker and the grid-connected electric energy meter is connected by the disconnecting link；The alarm device include main control MCU and with institute
Information acquisition module, electric voltage exception alarm module, frequency the variation alarm module, display module, uplink for stating main control MCU connection are logical
Believe module, memory module and power module；
Described information acquisition module for obtaining grid side voltage value u and frequency values f and being sent to the master control in real time in real time
The grid side voltage value u obtained in real time and frequency values f are also sent to display module and shown by MCU；The main control MCU is sentenced in real time
Whether whether disconnected voltage value u beyond voltage normal operation threshold value U, frequency values f exceed frequency normal operation threshold value F, when judging
When voltage value U exceeds voltage normal operation threshold value U, alarm command is sent to the electric voltage exception alarm module；When frequency values f is super
When going out frequency normal operation threshold value F, sends alarm command to the frequency and change alarm module；The electric voltage exception alarm module
For：After receiving alarm command, information warning is sent to administrative staff by the uplink communication module；The frequency variation
Alarm module is used for：After receiving alarm command, information warning is sent to administrative staff by the uplink communication module；It is described
Memory module is used for：The grid side voltage value u and frequency values f that storage information acquisition module obtains in real time store the alarm dress
The operation program set and all alarms record, the value range of the F are：The value range of 49.5-50.2Hz, the U is：
85%UN- 110%UN, UNIt refer to rated voltage；
The main control MCU connects infrared interface；The main control MCU connection communication interface unit, the communications interface unit include
RS485 telecommunication circuits；
Specific steps include：
(1) described information acquisition module obtains grid side voltage value u and frequency values f and is sent to the main control MCU in real time in real time,
At the same time, the grid side voltage value u obtained in real time and frequency values f display module is sent to show；
(2) whether the main control MCU real-time judge voltage value u exceeds voltage normal operation threshold value U, and the value range of the U is：
85%UN- 110%UN, when judging that voltage value U exceeds voltage normal operation threshold value U, it is different to the voltage to send alarm command
Normal alarm module, otherwise, return to step (1)；At the same time, whether the main control MCU real-time judge frequency values f is exceeding frequency just
Normal operation threshold F, the value range of the F are：49.5-50.2Hz, when frequency values f exceeds frequency normal operation threshold value F, hair
Alarm command to the frequency is sent to change alarm module, otherwise, return to step (1)；
(3) when the electric voltage exception alarm module receives alarm command, warning letter is sent by the uplink communication module
It ceases to administrative staff；When frequency variation alarm module receives alarm command, sent by the uplink communication module
Information warning is to administrative staff.
2. a kind of operation method of the grid-connected warning system of distributed generation resource according to claim 1, which is characterized in that described
Information acquisition module includes A/D converter；The display module is LED lattice lcd display；The uplink communication module is
GPRS/CDMA wireless modules, ethernet module or optic module；The memory module is NOR FLASH；The power module is
AC/DC Switching Power Supplies, the AC/DC Switching Power Supplies connect grid side.
3. a kind of operation method of the grid-connected warning system of distributed generation resource according to claim 1, which is characterized in that described
Alarm device further includes：Clock unit circuit, electric power management circuit, WDT circuits, temperature sensing circuit and ESAM encrypted circuits,
The clock unit circuit, the electric power management circuit, the WDT circuits, the temperature sensing circuit and ESAM encryptions
Circuit is separately connected the main control MCU.
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| CN105515206B (en) * | 2016-02-16 | 2018-02-23 | 国网山东省电力公司淄博供电公司 | A kind of distributed power source and its micro-capacitance sensor intelligent early-warning method |
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