CN216390598U - Distributed power supply coordination monitoring device - Google Patents
Distributed power supply coordination monitoring device Download PDFInfo
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- CN216390598U CN216390598U CN202121694028.1U CN202121694028U CN216390598U CN 216390598 U CN216390598 U CN 216390598U CN 202121694028 U CN202121694028 U CN 202121694028U CN 216390598 U CN216390598 U CN 216390598U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The utility model discloses a distributed power supply coordination monitoring device; the device comprises an alternating current sampling board, a switching value input board, a switching value output board, a main control board, a communication management board and a power supply board; the alternating current sampling board is used for connecting the secondary alternating current signals obtained by sampling to the main control board through alternating current conversion and A/D conversion by a data bus; the switching value input plate is connected to the main control plate through optical coupling isolation; the main control board isolates the controlled switching value signal through an optical coupler and is connected to an external circuit through the switching value output board; the communication management board completes data communication with the upper computer and the lower computer; and each module of the power panel supplies power. The device can solve the problem that the voltage of the power grid rises to the out-of-limit state, has the functions of automatic power generation, primary frequency modulation and the like, and meets the requirement of the distributed power supply for monitoring the stable operation of the power system in a steady state and a transient state.
Description
Technical Field
The utility model relates to the technical field of distributed power supply comprehensive automation, in particular to a photovoltaic, wind power, energy storage and other distributed power supply coordination monitoring device.
Background
A large amount of new energy is connected to a power grid in a distributed power supply mode, the proportion of the new energy is increased gradually, the photovoltaic energy and the wind energy with large proportion have obvious intermittence and random fluctuation, and the intermittence and the random fluctuation increase a lot of difficulties for transient power balance of a power system, so that the stability of the frequency of the power grid is not facilitated. On the other hand, for the distributed photovoltaic power station with the largest ratio, the unit power factor 1 of a fixed grid-connected point is generally adopted for control in a local control mode, the resistance and reactance ratio of the power distribution network is generally larger, the voltage of the grid-connected point is increased due to active injection of photovoltaic, the voltage is likely to fluctuate greatly due to active power fluctuation, and difficulty is brought to voltage regulation of the power distribution network. The traditional centralized power dispatching mode lacks effective management and control on distributed power sources which are numerous, different in form and not dispatchable, and hidden dangers are left for the stability and the safety of a power system.
The inverter for power conversion of the distributed power supply has rapid and continuous power regulation capacity, particularly reactive power regulation, and if the power regulation means are included in the regulation and control range of a power grid region, the inverter is helpful for enhancing the frequency and voltage stability of the power grid and improving the stability and safety of the operation of the power grid.
Most distributed power stations at present lack the means and devices for power coordination, generally only have simple information acquisition and forwarding devices, relay protection devices, power quality analysis devices and the like, are various and are not integrated, the connection is complex, and the investment is large.
Disclosure of Invention
In order to solve the above problems, the present invention provides a distributed power source coordination monitoring apparatus.
The utility model discloses a distributed power supply coordination monitoring device which comprises an alternating current sampling board, a switching value input board, a switching value output board, a main control board, a communication management board and a power supply board, wherein the alternating current sampling board is connected with the switching value input board;
the alternating current sampling board is used for connecting the secondary alternating current signals obtained by sampling to the main control board through alternating current conversion and A/D conversion by a data bus; wherein the secondary alternating current signal comprises three-phase voltage and three-phase current;
the switching value input board collects external switching values and is connected to the main control board through optical coupling isolation;
the main control board isolates the controlled switching value signal through an optical coupler and is connected to an external circuit through the switching value output board;
the communication management board completes data communication with the upper computer and the lower computer through an optical fiber or an Ethernet port or an RS485/RS232 serial port or a built-in wireless 4G/5G communication interface;
the power panel converts the power supply from the direct-current power supply screen into various voltages required by the work of the internal plate and supplies power to each module.
Preferably, the system also comprises a human-computer interface which is in signal connection with the main control panel and is used for displaying the data state and inputting partial data.
Preferably, signals of the communication management board and the main control board are communicated through an optical fiber or an Ethernet port or an RS485/RS232 serial port or a built-in wireless 4G/5G communication interface.
Preferably, the distributed power supply coordination monitoring device is connected with and communicates with each power generation unit of the power station, and communicates with the power grid regulation and control center in a wired or wireless mode.
Preferably, the alternating current sampling plate completes various remote signaling and remote measuring information acquisition and remote control and remote adjusting information receiving required by the power grid dispatching center.
The working principle of the device is as follows: the device obtains parameters such as total active power, reactive power, frequency, harmonic wave and the like of a grid point through the accessed secondary values (from PT and CT) of the voltage and the current of the grid point, and the parameters are respectively used for power control, information acquisition, relay protection and electric energy quality analysis; the device communicates with a power grid regulation and control center in a wired or wireless mode, uploads information and receives instructions; the local power station is connected with each power generation unit of the power station in a communication mode to obtain the state parameters of the power generation units; and the power control module obtains the decomposition values of the reactive power and the active power according to the control requirements of the power grid regulation center on the active frequency and the reactive voltage and by combining the working condition of the power station distribution network model and the inverter and the limiting value of the power voltage, and transmits the decomposition values to each power generation unit (inverter) for control and regulation. The relay protection module determines whether to act or not according to comparison of actual values and setting values of current, voltage and frequency.
The device can solve the problem that the voltage of the power grid rises to the out-of-limit state, has the functions of automatic power generation, primary frequency modulation and the like, meets the requirement of stable operation monitoring of the distributed power supply in the steady state and the transient state of the power system, enables the power station to realize the functions of remote signaling, remote measurement, remote control, remote modulation or local self-adaptation control, integrates the modules of relay protection, power quality analysis and the like required to be configured by the distributed power supply, and has important engineering application value and good economical efficiency.
Drawings
FIG. 1: the device of the utility model controls the connection diagram;
FIG. 2: the utility model relates to an internal structure block diagram of a device.
Detailed Description
The technology is further explained by combining the drawings in the specification.
The device is shown in figure 1, and is used in a power grid regulation center and a power station power generation device, and the original values of voltage and current of a grid-connected point (secondary measurement values of a voltage transformer and a current transformer, namely voltage of 100V and current of 5A or 1A) are collected in real time and are provided for each internal module for calculation. The device is connected with a power grid regional dispatching master station through a longitudinal encryption device (in a wired or wireless mode, communication protocols such as IEC61850, IEC60870-5-104, IEC60870-5-103, IEC60870-5-102 and IEC60870-5-101 are adopted), information is uploaded, and a control instruction is issued. The device and the centralized data acquisition communication (supporting communication protocols such as IEC61850, IEC60870 and Modbus) of each power generation unit or each inverter acquire information such as active and reactive power of the power generation units (inverters), and the power control module combines the working conditions of a power station distribution network model and the power generation units according to the control requirements of a power grid regulation and control center on active frequency and reactive voltage to obtain the decomposition values of the reactive power and the active power required by stable and safe operation of the power grid, and sends the decomposition values to each power generation unit for control and regulation. The remote power regulation and local automatic control comprises the following steps:
1) reactive power and voltage control, namely utilizing the reactive power regulation capability of the power generation units to the maximum extent according to the limit values of reactive power output of all power generation units in a real-time station (according to the rated value and real-time active power output of the power generation units), realizing reactive voltage control, and specifically designing three control modes: (1) direct reactive power control (remote regulation according to a scheduling instruction); (2) bus voltage control; (3) and (4) constant power factor control. And the control strategy of AVC and SVG is provided.
2) And active power and frequency control, namely implementing active power regulation of the power generation unit according to the steady-state and transient-state operation requirements of the power system. Four control modes are specifically designed: (1) direct active power control (per schedule AGC commands); (2) primary frequency modulation function; (3) suppressing oscillation of the power system; (4) and (5) accurate load control.
The remote control mode comprises on-off of a grid-connected switch, starting and stopping of a power station and the like, and is output through a digital interface.
The information collection function involves:
1) remote signaling: and a grid-connected point switch, a power station accident total signal and the like.
2) Telemetry: and the grid-connected point voltage, current, active power, reactive power, frequency, on-line electricity quantity, power factor, power station adjustable power generation margin and the like.
Relay protection design: three-stage overcurrent protection (composite voltage latch); zero-sequence overcurrent protection; overload protection; low-voltage protection; overvoltage protection; low-frequency protection; reclosing (post acceleration).
Electric energy analysis: three-phase voltage fundamental wave and 2-13 harmonic effective values, three-phase current fundamental wave and 2-13 harmonic effective values, total harmonic voltage, current distortion rate and voltage qualification rate. The increase of the number of the analyzed harmonics can be based on the sampling frequency according to actual requirements.
The device is designed with a human-computer interface: the system has the functions of event recording and data recording, and provides detailed and comprehensive data information for the action behavior of the analysis device.
The distributed power supply coordination monitoring device is an intelligent device which takes a microprocessor as a core on hardware, mainly comprises an alternating current sampling board, a switching value input board, a switching value output board, a main control board, a communication management board, a power board, a human-computer interface and the like, is a compact integrated device, and can be installed on a secondary screen cabinet of a power station. The specific internal connection block diagram is shown in fig. 2.
The alternating current sampling board is used for connecting secondary alternating current signals (three-phase voltage and three-phase current) to the main control board through alternating current conversion and A/D conversion by a data bus; the switching value input board is used for acquiring external switching values and is connected to the main control board through optical coupling isolation; the switching value signal controlled by software is isolated by an optical coupler and is connected to an external circuit by a switching value output board; the communication management board completes data communication with the upper computer and the lower computer through an optical fiber or an Ethernet port or an RS485/RS232 serial port or a built-in wireless 4G/5G communication interface; the human-computer interface is used for displaying the data state and inputting partial data; and the power panel converts the power supply from the direct-current power supply panel into various voltages required by the work of the internal panel.
Claims (5)
1. The utility model provides a monitoring device is coordinated to distributed generator which characterized in that: the device comprises an alternating current sampling board, a switching value input board, a switching value output board, a main control board, a communication management board and a power supply board;
the alternating current sampling board is used for connecting the secondary alternating current signals obtained by sampling to the main control board through alternating current conversion and A/D conversion by a data bus; wherein the secondary alternating current signal comprises three-phase voltage and three-phase current;
the switching value input board collects external switching values and is connected to the main control board through optical coupling isolation;
the main control board isolates the controlled switching value signal through an optical coupler and is connected to an external circuit through the switching value output board;
the communication management board is in signal connection with the main control board to complete data communication with the upper computer and the lower computer;
the power panel converts the power supply from the direct-current power supply screen into various voltages required by the work of the internal plate and supplies power to each module.
2. The device for coordinately monitoring distributed power sources according to claim 1, wherein: the system also comprises a human-computer interface which is in signal connection with the main control board and is used for displaying the data state and inputting partial data.
3. The device for coordinately monitoring distributed power sources according to claim 1, wherein: the communication management board is connected with the main control board through an optical fiber or an Ethernet port or an RS485/RS232 serial port or a built-in wireless 4G/5G communication interface.
4. The device for coordinately monitoring distributed power sources according to claim 1, wherein: the distributed power supply coordination monitoring device is connected and communicated with each power generation unit of the power station and is communicated with the power grid regulation and control center in a wired or wireless mode.
5. The device for coordinately monitoring distributed power sources according to claim 1, wherein: the alternating current sampling plate completes various remote signaling and remote measuring information acquisition and remote control and remote adjusting information receiving required by a power grid dispatching center.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121694028.1U CN216390598U (en) | 2021-07-23 | 2021-07-23 | Distributed power supply coordination monitoring device |
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| CN202121694028.1U CN216390598U (en) | 2021-07-23 | 2021-07-23 | Distributed power supply coordination monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113555961A (en) * | 2021-07-23 | 2021-10-26 | 杭州东华电力设备有限公司 | Distributed power supply coordination monitoring device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113555961A (en) * | 2021-07-23 | 2021-10-26 | 杭州东华电力设备有限公司 | Distributed power supply coordination monitoring device and method |
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