CN105305637B - A kind of grid-connected warning system of distributed generation resource and its operation method - Google Patents

Abstract

The invention relates to a distributed power grid-connected alarm system and its operating method, including a photovoltaic module, an inverter, a voltage loss tripping circuit breaker, a knife switch, a grid-connected electric energy meter, an alarm device, an electric leakage protection circuit breaker, an inverter circuit breaker, grid-connected watt-hour meter, alarm device, and leakage protection circuit breaker are connected in sequence, and the voltage-loss tripping circuit breaker is connected to the grid-connected watt-hour meter through a knife switch; the alarm device includes the main control MCU and the main control MCU Connected information collection module, abnormal voltage alarm module, frequency change alarm module, display module, uplink communication module, storage module and power supply module. When the invention is in operation, the leakage protection circuit breaker is connected to the power grid side. When the power grid side loses voltage or the frequency changes beyond a certain range, the alarm device can send alarm information to notify the management personnel to check the operation status of the distributed power grid-connected system equipment , which improves the safety of power grids, equipment and operation and maintenance managers on a larger scale and to a greater extent.

Description

A distributed power grid-connected alarm system and its operating method

technical field

The invention relates to a distributed power grid-connected alarm system and an operating method thereof, belonging to the technical field of distributed power grid-connected detection.

Background technique

As the country's promotion and use of new energy is becoming more and more popular, how to ensure safe and orderly management of power generation customers has become an important issue for power supply companies.

At present, the most research is on the influence of distributed power generation on the grid operation mode and the research on the islanding detection method after grid connection, but the details of the safety management of operation and maintenance personnel are rarely considered. In 2015, applications for grid-connection of distributed power generation developed in a blowout manner. Due to the particularity of installation conditions, most of them were distributed power generation projects for households in towns and villages. The geographical spanning is large, the dispersion is strong, and management is prone to omissions and confusion. , combined with the development of the industry and the actual management status of power generation users by various management units, the difficulty is that it is impossible to notify the management personnel at the location of the power generation project in the first place, thus increasing the risk of safety accidents such as reverse power transmission and misoperation during power grid maintenance. .

Chinese patent document CN102116816A discloses a distributed power grid-connected operation monitoring device, including a signal acquisition module, a signal processing module and a management control module; the signal acquisition module collects the voltage and current of the distributed power grid and the main power grid; the signal The processing module calculates electrical parameters according to the voltage and current; the management control module receives and stores the electrical parameters, and manages and controls the grid-connected operation of the distributed power grid according to the electrical parameters. The invention measures the voltage and current of the distributed grid and the main grid at the grid-connected interface, adopts preprocessing and high-speed digital signal processing, accurately calculates the electrical parameters of the distributed grid and the main grid, and performs grid-connected operation of the distributed power supply according to the electrical parameters Through monitoring, management and control, mastering the actual static and dynamic behavior of the distribution network can guide the safe and economical operation of the distribution network and ensure the stability and security of the distribution network. However, this patent has the following defects: (1) The detection current cannot obviously reflect the power quality change of the grid failure, because when the grid is powered off, the distributed power supply may still supply power to the load normally, and the current change is very small at this time, so it cannot be used as Judgment basis; (2) Does not have low-voltage ride-through capability and frequency response capability.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a distributed power grid-connected alarm system;

The present invention also provides an operation method of the above-mentioned distributed power grid-connected alarm system;

The invention can monitor the running conditions of all grid-connected distributed power sources in real time, has the functions of anti-islanding detection and alarm, high detection precision, small detection blind area, accurate and timely alarm, and high safety. When the power grid is out of maintenance, the management personnel at the location of the project can be notified at the first time, and the grid-connected side knife switch is disconnected in time to ensure the safety of the maintenance personnel and the power grid.

Terminology Explanation

1. WDT is the abbreviation of English Watchdog Timer. Watchdog Timer Chinese name Watchdog. It is a timer circuit, generally has one input, called feeding dog, and one output to the RST terminal of the MCU. When the MCU is working normally, it outputs a signal to the feeding dog terminal every once in a while, and clears WDT. If it exceeds the specified Time does not feed the dog, (generally when the program runs away), when the WDT time exceeds, a reset signal will be sent to the MCU to reset the MCU and prevent the MCU from crashing. The function of the watchdog is to prevent the program from infinitely looping, or The program runs away.

2. Islanding, that is, the islanding effect, means that in the event of a planned or unplanned power outage in the power grid, the power generation device connected to the power grid cannot be detected or has no corresponding detection means at all, and still feeds power to the power grid.

Technical scheme of the present invention is:

A distributed power grid-connected alarm system, including a photovoltaic module, an inverter, a voltage loss tripping circuit breaker, a knife switch, a grid-connected electric energy meter, an alarm device, and a leakage protection circuit breaker. The photovoltaic module, the inverter The voltage-loss tripping circuit breaker, the grid-connected electric energy meter, the alarm device, and the leakage protection circuit breaker are connected in sequence, and the voltage-loss tripping circuit breaker is connected to the grid-connected Electric energy meter; the alarm device includes a main control MCU and an information collection module connected to the main control MCU, a voltage abnormality alarm module, a frequency change alarm module, a display module, an uplink communication module, a storage module and a power supply module.

Preferably, according to the present invention, the information collection module is used to obtain the voltage value u and the frequency value f of the power grid side in real time and send them to the main control MCU in real time, and also send the voltage value u and the frequency value f of the power grid side obtained in real time to The display module displays; the main control MCU judges in real time: whether the voltage value u exceeds the voltage normal operation threshold U, whether the frequency value f exceeds the frequency normal operation threshold F, and when it is judged that the voltage value U exceeds the voltage normal operation threshold U, an alarm is sent Instructions to the abnormal voltage alarm module; when the frequency value f exceeds the frequency normal operation threshold F, send an alarm instruction to the frequency change alarm module; the abnormal voltage alarm module is used to: after receiving the alarm instruction, through the The uplink communication module sends warning information to the management personnel; the frequency change alarm module is used for: after receiving the warning instruction, sends the warning information to the management personnel through the uplink communication module; the storage module is used for: storing the information collection module in real time The acquired grid-side voltage value u and frequency value f store the operation program and all alarm records of the alarm device. The value range of F is: 49.5-50.2 Hz, and the value range of U is: 85 %U _N -110% U _N , U _N refers to the rated voltage.

When the present invention is in operation, the leakage protection circuit breaker is connected to the grid side. When the grid side loses voltage or the frequency changes beyond a certain range, the alarm device can send alarm information to notify the management personnel, and the management personnel check the distribution according to the alarm information. The equipment operation status of the grid-connected power supply system improves the safety of the power grid, equipment and operation and maintenance management personnel in a wider range and to a greater extent. Moreover, when the inverter has an anti-islanding monitoring blind area or the inverter’s anti-islanding function fails, that is, it cannot operate within a certain range and cannot realize the anti-islanding protection function, the alarm device can make up for this defect and realize the second-level anti-islanding function monitoring function.

Preferably according to the present invention, the information collection module includes an A/D converter; the display module is an LED dot-matrix liquid crystal display; the uplink communication module is a GPRS/CDMA wireless module, an Ethernet module or an optical fiber (EPON) module ; The storage module is NOR FLASH; the power module is an AC/DC switching power supply, and the AC/DC switching power supply is connected to the grid side.

The collected digital information such as voltage value u and frequency value f on the grid side is converted into an analog signal through an A/D converter, and the analog signal is sent to the main control MCU.

The uplink communication module adopts a modular design, has a module type identification bit, can automatically identify different types of modules, and supports hot-swappable functions;

The AC/DC switching power supply converts the AC mains power into a low-voltage direct current to provide power for the warning device. Wide voltage range input, suitable for three voltage specifications of 57.7/220/380V. The AC voltage is sampled through the isolated voltage transformer to realize the AC voltage monitoring function.

Preferably according to the present invention, the alarm device further includes: a clock unit circuit, a power management circuit, a WDT circuit, a temperature detection circuit and an ESAM encryption circuit, the clock unit circuit, the power management circuit, the WDT circuit, the The temperature detection circuit and the ESAM encryption circuit are respectively connected to the main control MCU.

The clock unit circuit provides the clock time required for the operation of the alarm device, adopts automatic temperature compensation, provides a lithium battery to maintain the normal operation of the clock during power failure, and alarms when the battery voltage is undervoltage; the power management circuit provides various DC voltages required for the operation of the main control MCU , support system power failure reporting; WDT circuit ensures the normal power-on initialization of the main control MCU, monitors the operation of the alarm device and monitors the abnormal condition of the voltage of the alarm device; the temperature detection circuit detects the ambient temperature of the alarm device, and provides temperature for the accuracy compensation of metering and sampling parameters to ensure the measurement accuracy of the alarm device in the range of -40 to +75°C; the ESAM encryption circuit realizes the encryption function of communication messages.

Preferably, according to the present invention, the main control MCU is connected to an infrared interface.

The advantage of the design here is that it has infrared communication function. The infrared communication circuit is for modulating far infrared to realize and maintain the communication function of the handheld computer.

Preferably, according to the present invention, the main control MCU is connected to a communication interface unit, and the communication interface unit includes an RS485 communication circuit.

The advantage of the design here is that the communication interface unit provides local communication channels, including RS485 communication circuits, remote signaling circuits, etc. The RS485 communication circuit adopts industrial-grade 485 chip (can resist human body model ±15KV static electricity), and the three-way 485 circuit and the main system circuit all adopt optocoupler isolation communication mode, with over-current and over-voltage protection functions. The terminal provides 1 channel of remote signal input, which uses optocoupler isolation to realize signal transmission with the MCU, and uses current-limiting resistors and TVS at the signal access to realize over-current and over-voltage protection respectively.

The specific steps of the operation method of the above-mentioned distributed power grid-connected alarm system include:

(1) The information acquisition module acquires the grid side voltage value u and frequency value f in real time and sends them to the main control MCU in real time, and at the same time, sends the grid side voltage value u and frequency value f acquired in real time to the display module show;

(2) The main control MCU judges in real time whether the voltage value u exceeds the voltage normal operation threshold U, and the value range of the U is: 85% U _N -110% U _N , when it is judged that the voltage value U exceeds the voltage normal operation When the threshold U, send an alarm command to the abnormal voltage alarm module, otherwise, return to step (1); at the same time, the main control MCU judges in real time whether the frequency value f exceeds the frequency normal operation threshold F, and the acquisition of the F The value range is: 49.5-50.2Hz. When the frequency value f exceeds the frequency normal operation threshold F, an alarm command is sent to the frequency change alarm module, otherwise, return to step (1);

(3) When the abnormal voltage alarm module receives an alarm instruction, it sends an alarm message to the management personnel through the uplink communication module; when the frequency change alarm module receives an alarm instruction, it sends an alarm through the uplink communication module information to management.

The beneficial effects of the present invention are:

1. When the present invention is running, the leakage protection circuit breaker is connected to the power grid side. When the power grid side loses voltage or the frequency changes beyond a certain range, the alarm device can send alarm information to notify the management personnel. Check the operation status of the distributed power grid-connected system equipment, which improves the safety of the grid, equipment and operation and maintenance management personnel in a wider range and to a greater extent.

2. The inverter has an anti-islanding monitoring blind area or the inverter’s anti-islanding function fails, that is, it cannot operate within a certain range and cannot realize the anti-islanding protection function. The alarm device can make up for this defect and realize the second-level anti-islanding function monitoring function.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a structural block diagram of the alarm device of the present invention.

Fig. 3 is a structural block diagram of the alarm device described in Embodiment 2.

Fig. 4 is a flowchart of the operating method of the present invention.

In Figure 1-4, 1. Photovoltaic module, 2. Inverter, 3. Loss of voltage trip circuit breaker, 4. Knife switch, 5. Grid-connected energy meter, 6. Alarm device, 7. Leakage protection circuit breaker, 8. Main control MCU, 9. Information acquisition module, 10. Voltage abnormality alarm module, 11. Frequency change alarm module, 12. Display module, 13. Uplink communication module, 14. Storage module, 15. Power supply module, 16. Clock Unit circuit, 17, power management circuit, 18, WDT circuit, 19, temperature detection circuit, 20, ESAM encryption circuit.

Detailed ways

The present invention will be further limited below in conjunction with the accompanying drawings and embodiments, but not limited thereto.

Example 1

A distributed power grid-connected alarm system, including a photovoltaic module 1, an inverter 2, a voltage loss trip circuit breaker 3, a knife switch 4, a grid-connected electric energy meter 5, an alarm device 6, and a leakage protection circuit breaker 7, the The photovoltaic module 1, the inverter 2, the voltage-loss trip circuit breaker 3, the grid-connected electric energy meter 5, the alarm device 6, and the leakage protection circuit breaker 7 are connected in sequence, and the voltage-loss trip The circuit breaker 3 is connected to the grid-connected electric energy meter 5 through the knife switch 4; the alarm device 6 includes a main control MCU 8 and an information collection module 9 connected to the main control MCU 8, an abnormal voltage alarm module 10, a frequency change An alarm module 11 , a display module 12 , an uplink communication module 13 , a storage module 14 and a power supply module 15 . As shown in Figure 1.

The under-voltage tripping circuit breaker 3 is used for: when the grid is powered off or the grid voltage drops too much (undervoltage) for some reason, the distributed power supply can be cut off from the grid to play the role of undervoltage and zero voltage protection. When the power grid voltage recovers, the undervoltage tripping circuit breaker 3 is also in the disconnected state, and the knife switch 4 must be closed by manual operation to ensure personal safety and equipment safety.

The function of adding a knife switch 4 behind the voltage-loss tripping circuit breaker 3 is to form an obvious disconnection point between the maintenance equipment and the live equipment when the equipment is overhauled according to the safety regulations, so as to ensure the personal safety of the overhaul construction personnel.

The leakage protection circuit breaker 7 is installed on the side of the power grid. When leakage or electric shock occurs, and when the operating current limited by protection is reached, it will automatically cut off the power supply within a limited time for protection.

The main control MCU8 completes sampling and calculation, storage and communication at the same time, can support online maintenance, and uses the State Grid 13 standard protocol-conforming to the State Grid's collection regulations for terminals.

(1) Based on ARM 32-bit Cortex-M3 processor, the main frequency is up to 120MHz, and the processing capacity can reach 150DMIPS when running at high speed

(2) The processor is embedded with 512KB Flash and 128+4KByte SRAM.

(3) Lower dynamic power consumption, 188uA/MHz: running at full speed of 120MHz from the on-chip flash memory, the power consumption is only 22.5mA.

(4) FSMC interface, flexible high-speed external memory interface, used to expand off-chip memory and peripherals

(5) Excellent real-time performance, real-time flash accelerator. The adaptive real-time flash accelerator enables the STM32F2 to execute code at a high speed of 120MHz on the on-chip flash memory without waiting, thus maximizing the performance of the Cortex-M3.

(6) More flexible and innovative high-performance peripherals, supporting USB OTG in high-speed mode, and video sensor interface.

(7) Flexible static memory interface with a rate up to 60MHz.

(8) Two 32-bit timers, a multi-function RTC32-bit timer with calendar function.

(9) Higher speed communication interface, three 12-bit ADC modules, sampling rate up to 2M/s.

(10) 82 GPIOs with toggle rate up to 60MHz.

The information acquisition module 9 is used to acquire the grid side voltage value u and frequency value f in real time and send them to the main control MCU 8 in real time, and also send the grid side voltage value u and frequency value f acquired in real time to the display module 12 for display; The main control MCU8 judges in real time whether the voltage value u exceeds the voltage normal operation threshold U, whether the frequency value f exceeds the frequency normal operation threshold F, and when it is judged that the voltage value U exceeds the voltage normal operation threshold U, an alarm command is sent to the voltage Abnormal alarm module 10; when the frequency value f exceeds the frequency normal operation threshold F, send an alarm command to the frequency change alarm module 11; the voltage abnormal alarm module 10 is used to: after receiving the alarm command, through the uplink communication The module 13 sends warning information to the management personnel; the frequency change warning module 11 is used for: after receiving the warning instruction, sends the warning information to the management personnel through the uplink communication module 13; the storage module 14 is used for: storing information collection Module 9 acquires the grid side voltage value u and frequency value f in real time, stores the operation program of the alarm device 6 and all alarm records, the value range of F is: 49.5-50.2Hz, and the value of U The range is: 85% U _N -110% U _N , U _N refers to the rated voltage.

When the present invention is in operation, the leakage protection circuit breaker 7 is connected to the power grid side. When the power grid side loses voltage or the frequency changes beyond a certain range, the alarm device 6 can send alarm information to notify the management personnel, and the management personnel will go to the power grid according to the alarm information. Check the operation status of the distributed power grid-connected system equipment, which improves the safety of the grid, equipment and operation and maintenance management personnel in a wider range and to a greater extent. Moreover, when the inverter has an anti-islanding monitoring blind area or the inverter’s anti-islanding function fails, that is, it cannot operate within a certain range and cannot realize the anti-islanding protection function, the alarm device 6 can make up for this defect and realize the secondary anti-islanding function. Island monitoring function.

Described information collecting module 9 comprises A/D converter; Described display module 12 is LED dot-matrix liquid crystal display; Described uplink communication module 13 is GPRS/CDMA wireless module, Ethernet module or optical fiber (EPON) module; Described The storage module 14 is NOR FLASH; the power module 15 is an AC/DC switching power supply, and the AC/DC switching power supply is connected to the grid side.

The collected digital information such as voltage value u and frequency value f on the grid side is converted into an analog signal through an A/D converter, and the analog signal is sent to the main control MCU 8 .

The display module 12 can realize the working state indication of the warning device 6, and the working state indication includes: running light, warning light, online light, signal strength light, LINK light, DATA light, remote light and local light, etc. 8 indicator lights, respectively Indicate the current operating status of the alarm device 6, the occurrence and recording of alarm events, the online status of the uplink communication channel of the alarm device 6, the signal strength of the current uplink communication channel, the link status of the Ethernet, the data interaction of the Ethernet, and the remote communication module The communication status of and the communication status of the local communication interface.

The display module 12 can display the grid-side voltage (1V accuracy) and grid-side frequency (0.2Hz accuracy), which are displayed in turn every 3 seconds at ordinary times, and once in a second when an abnormality occurs. Copy and read various data (3 issues).

The uplink communication module 13 adopts a modular design, has a module type identification bit, can automatically identify different types of modules, and supports hot-swappable functions;

The AC/DC switching power supply converts AC mains power into low-voltage direct current to provide power for the warning device 6 . Wide voltage range input, suitable for three voltage specifications of 57.7/220/380V. The AC voltage is sampled through the isolated voltage transformer to realize the AC voltage monitoring function.

The alarm system described in this embodiment adopts industrial-grade Cortex-M3 series controllers and embedded real-time operating systems to simultaneously complete sampling and calculation, storage and communication, and can support online maintenance. Network-to-terminal collection protocol. It has the characteristics of excellent electromagnetic compatibility, high reliability, light size and convenient installation.

The alarm system described in this embodiment is applied to a TLY2230 line.

Example 2

According to a distributed power grid-connected alarm system described in Embodiment 1, the difference is that the alarm device also includes: a clock unit circuit 16, a power management circuit 17, a WDT circuit 18, a temperature detection circuit 19 and an ESAM encryption circuit 20 , the clock unit circuit 16 , the power management circuit 17 , the WDT circuit 18 , the temperature detection circuit 19 and the ESAM encryption circuit 20 are respectively connected to the main control MCU 8 .

The clock unit circuit 16 provides the clock time required for the operation of the alarm device 6, adopts automatic temperature compensation, provides lithium batteries to maintain the normal operation of the clock during power outages, and alarms when the battery voltage is undervoltage; the power management circuit 17 provides various functions required by the main control MCU8 operation. A DC voltage to support system power outage reporting; WDT circuit 18 ensures the normal power-on initialization of the main control MCU8, monitors the operation of the alarm device 6 and monitors the abnormal condition of the voltage of the alarm device 6; the temperature detection circuit 19 detects the ambient temperature of the alarm device 6, Provide temperature parameters for the accuracy compensation of metering sampling, and ensure the metering accuracy of the alarm device 6 within the range of -40°C to +75°C; the ESAM encryption circuit 20 realizes the encryption function of communication messages.

Example 3

The operating method of a distributed power grid-connected alarm system described in Embodiment 2, the specific steps include:

(1) The information acquisition module 9 acquires the grid side voltage value u and the frequency value f in real time and sends them to the main control MCU 8 in real time, and at the same time, sends the grid side voltage value u and the frequency value f acquired in real time to the display Module 12 shows;

(2) The main control MCU8 judges in real time whether the voltage value u exceeds the voltage normal operation threshold U, and when it is judged that the voltage value U exceeds the voltage normal operation threshold U, an alarm command is sent to the abnormal voltage alarm module 10, and the grid side voltage Value range and corresponding abnormal voltage alarm module 10 response time are as shown in table 1, otherwise, return step (1); Meanwhile, described master control MCU8 judges whether frequency value f exceeds frequency normal operation threshold value F in real time, power grid The value range of the side frequency and the response time of the corresponding frequency change alarm device 11 are as shown in Table 2. When the frequency value f exceeds the frequency normal operation threshold F, an alarm command is sent to the frequency change alarm module 11, otherwise, return to step ( 1);

Table 1

Grid side voltage u Voltage abnormal alarm module response time/s 20% U _N ≤ U < 50% U _N 0.1 50% U _N ≤ U < 85% U _N 2.0 85% U _N ≤ U < 110% U _N normal operation 110% U _N ≤ U < 135% U _N 2.0 135% U _N ≤ U 0.05

Table 2

Grid side frequency f/Hz Response time of frequency change alarm device/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) When the abnormal voltage alarm module 10 receives an alarm instruction, it sends an alarm message to the management personnel through the uplink communication module 13; Module 13 sends warning information to management personnel. 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%U_N- 110%U_N, U_NIt 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%U_N- 110%U_N, 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.