CN109004751B - Lightweight distributed energy gateway equipment - Google Patents
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Abstract
The invention discloses a lightweight distributed energy gateway device, which realizes the multifunctional integrated design of telecontrol function, protection function, electric energy quality monitoring function and regional autonomous control through a lightweight gateway device through a matched device among modules, reduces the quantity of devices required to be configured when a distributed new energy is connected to the grid through an integrated gateway device, further reduces the access cost of the distributed new energy connected to the grid, and solves the technical problem that the input cost of the existing device for managing the distributed new energy access is overhigh.
Description
Technical Field
The invention relates to the field of intelligent gateway equipment, in particular to lightweight distributed energy gateway equipment.
Background
With the popularization of concepts of smart power grids and smart power utilization and the gradual maturity of internet technologies, the collected power utilization data of the power consumers are uploaded to a master station system so as to process big data and provide value-added services, and the method becomes a new direction for the development of power utilization data application technologies of the power consumers.
In recent years, as the number of users accessing distributed new energy resources greatly rises, the uncontrollable performance and complexity of power flow bring impact on the control and protection of the power distribution network, and meanwhile, opportunities are brought to the intelligent control of the power distribution network. The influence of new energy on the power distribution network needs to be reduced by means of information acquisition of new energy equipment, intelligent control of local electric power, intelligent interaction with a master station system, protection, power quality monitoring and the like.
In order to better manage the user new energy equipment, a plurality of pieces of equipment such as telecontrol equipment, a protection device, a region controller, an electric energy quality monitoring device and the like need to be configured for the user new energy equipment of each user, but a large number of pieces of matching equipment also cause the technical problem that the equipment investment cost of the existing distributed new energy access management is too high.
Disclosure of Invention
The invention provides lightweight distributed energy gateway equipment, which is used for solving the technical problem that the investment cost of the existing distributed new energy access management equipment is too high.
The invention provides a lightweight distributed energy gateway device, which comprises: the device comprises a processing module, an uplink transmission module, a communication access module, a measurement and control module, a unified information interface module and a data bus;
the data bus is respectively connected with the processing module, the unified information interface module, the measurement and control module and the communication access module;
the measurement and control module is used for acquiring grid-connected point data of grid-connected points in a preset area and controlling the on-off state of each grid-connected point switch, wherein the grid-connected point data specifically comprises: the grid-connected point switch position, the voltage on two sides of the grid-connected point and the current of the grid-connected point;
the communication access module is used for acquiring equipment data and metering data of new energy equipment in a preset area;
the uplink transmission module is in communication connection with the unified information interface module, wherein the uplink transmission module is used for establishing communication connection with the master station platform;
the processing module specifically comprises: the system comprises a telecontrol submodule, a protection submodule, an electric energy quality monitoring submodule and an area autonomy submodule.
Preferably, the telecontrol sub-module is specifically configured to construct an IEC 61850-based station-side model according to the grid-connected point data and the device data and metering data of the new energy device.
Preferably, the protection sub-modules comprise an overcurrent protection secondary sub-module, an island protection secondary sub-module and a reverse power protection secondary sub-module;
the overcurrent protection secondary submodule is used for judging overcurrent faults according to the grid-connected point currents, and when the grid-connected point currents exceed a preset current threshold, the measurement and control module is triggered to disconnect the grid-connected point switches corresponding to the grid-connected point currents exceeding the current threshold;
the island protection secondary submodule is used for carrying out island fault judgment according to voltages on two sides of each grid-connected point, and when the voltages on the two sides of the grid-connected points exceed a preset voltage threshold, the measurement and control module is triggered to disconnect the grid-connected point switches corresponding to the voltages on the two sides of the grid-connected points exceeding the voltage threshold;
and the reverse power protection secondary subunit is used for carrying out reverse power fault judgment according to the power flow direction of each grid-connected point, and when the power flow direction of the grid-connected point is opposite to the preset flow direction, the measurement and control module is triggered to disconnect the grid-connected point switch corresponding to the reverse power flow.
Preferably, the power quality monitoring submodule is configured to calculate an unbalance degree of a three-phase voltage, an unbalance degree of a three-phase current, and a voltage deviation of the grid-connected point according to the grid-connected point data.
Preferably, the regional autonomous sub-module specifically includes: the power generation rate calculation secondary submodule and the power generation amount scheduling secondary submodule;
the power generation rate calculation secondary submodule is specifically used for calculating the total available power, the total reactive power and the total reactive power of the new energy equipment;
and the generating capacity scheduling secondary submodule is used for adjusting the generating power of the new energy equipment according to the power target parameter received from the main station platform.
Preferably, the increasable total active power is specifically an accumulated sum of differences between preset active power and real-time active power of each new energy device;
the reducible total active power is specifically based on the accumulated sum of the real-time active power of the new energy device;
the increasable total reactive power is specifically the accumulated sum of the differences between the rated maximum reactive power and the real-time reactive power of each new energy device;
the total reactive power, in particular the cumulative sum of the differences between the real-time reactive power and the rated minimum reactive power of the new energy device, may be reduced.
Preferably, the power generation amount scheduling secondary sub-module is specifically configured to:
judging whether power target parameters sent by a master station platform are received or not, if so, adjusting the power generation power of the new energy equipment according to a first target power calculation formula, and if not, adjusting the power generation power of the new energy equipment according to a second target power calculation formula;
wherein the first target power calculation formula is:
the second target power calculation formula is:
wherein, Prat(i) Rated active power of the ith new energy device, N is the total number of the new energy devices in operation, and Qrat(i) Rated reactive power, P, for the ith new energy deviceSETTarget parameter of active power, Q, emitted for the platform of the master stationSETAnd the target parameters of the reactive power sent by the main station platform.
Preferably, the method further comprises the following steps: an HMI interaction module;
the HMI interaction module is connected with the data bus.
Preferably, the method further comprises the following steps: a storage module;
the memory module is connected with the data bus.
Preferably, the method further comprises the following steps: a power supply module;
the power module is used for providing electric energy for each module in the lightweight distributed energy gateway equipment.
According to the technical scheme, the invention has the following advantages:
the invention provides a lightweight gateway device which realizes a telecontrol function, a protection function, an electric energy quality monitoring function and a multifunctional integration design of regional autonomous control through matching devices among modules, reduces the quantity of devices required to be configured when the distributed new energy is connected to the grid through the integrated gateway device, further reduces the access cost of the distributed new energy connected to the grid, and solves the technical problem of overhigh equipment investment cost of the existing distributed new energy access management.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an embodiment of a lightweight distributed energy gateway device provided in the present invention;
fig. 2 is a system diagram of an embodiment of a lightweight distributed energy gateway device provided in the present invention;
fig. 3 is a schematic structural diagram of a processing module in a lightweight distributed energy gateway device according to the present invention
Fig. 4 is a schematic structural diagram of a protection submodule in a lightweight distributed energy gateway device provided in the present invention;
wherein the reference numbers are as follows:
1. a processing module; 2. a power supply module; 3. a storage module; 4. unifying the information interface module; 5. an HMI interaction module; 6. a communication access module; 7. a measurement and control module; 8. an uplink transmission module; 9. a data bus; 11. a telemechanical submodule; 12. a protection submodule; 121. an overcurrent protection secondary submodule; 122. an island protection secondary submodule; 123. the reverse power protection secondary submodule; 13. a power quality monitoring submodule; 14. and (4) an area autonomous submodule.
Detailed Description
The embodiment of the invention provides a lightweight distributed energy gateway device, which is used for solving the technical problem that the investment cost of the existing distributed new energy access management device is too high.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, an embodiment of the present invention provides a lightweight distributed energy gateway device, including: the system comprises a processing module 1, an uplink transmission module 8, a communication access module 6, a measurement and control module 7, a unified information interface module 4 and a data bus 9;
the data bus 9 is respectively connected with the processing module 1, the unified information interface module 4, the measurement and control module 7 and the communication access module 6;
the measurement and control module 7 is configured to acquire grid-connected point data of a grid-connected point in a preset area and control an on-off state of each grid-connected point switch, where the grid-connected point data specifically includes: the grid-connected point switch position, the voltage on two sides of the grid-connected point and the current of the grid-connected point;
the communication access module 6 is used for acquiring equipment data and metering data of new energy equipment in a preset area;
wherein, communication access module 6 has contained RS485 interface and net gape, uses hard-wired and new energy equipment, strapping table etc. to have communication interface's device to carry out communication connection through RS485 interface or net gape, realizes the acquisition to data and the control to equipment.
The uplink transmission module 8 is in communication connection with the unified information interface module 4, wherein the uplink transmission module 8 is used for establishing communication connection with the master station platform;
the unified information interface module 4 is used for converting a data format, converting heterogeneous data acquired by the gateway device of this embodiment into a predetermined protocol format, and then transmitting the predetermined protocol format to the master station platform through the uplink transmission module 8, so that the master station platform can summarize and store the data, and also can convert information of a specific protocol transmitted to the gateway device by the master station platform into other private protocols, so that the master station can control the user new energy devices.
The uplink transmission module 8 can be directly connected with the wireless communication unit through an RS232 port in a hard wiring manner, is communicated with the master station system in a wireless manner, and can also be directly connected with the master station system through a network port in a hard wiring manner, and the specific communication mode can be freely selected by a user according to actual assembly requirements;
the processing module 1 specifically includes: the system comprises a telecontrol submodule 11, a protection submodule 12, a power quality monitoring submodule 13 and an area autonomous submodule 14.
It should be noted that, further, the telemechanical sub-module 11 is specifically configured to construct an IEC 61850-based station-side model according to the grid-connected point data and the device data and metering data of the new energy device.
The station-side model in the telecontrol sub-module 11 is established based on IEC-61850, and the telecontrol sub-module 11 has a CSC2000 protocol or a standard IEC60870-5-103 protocol and an extended IEC103 protocol and is communicated with the monitoring master station; the communication with the main station of the fault information system is carried out by an extended IEC103 protocol, and the communication can be automatically interacted with corresponding points in a main station model after the communication is established
In addition, the station-side model in the telemechanical submodule 11 of this embodiment further includes different new energy devices such as wind power generation, photovoltaic power generation, an energy storage system, a small hydropower system, and the like, and data structures of their grid-connected points. The data structure comprises information of remote measurement, remote signaling, remote control and remote regulation. The master station system can acquire a data structure of a station side model of the gateway equipment, establish a corresponding station side model, and purchase a more complete new energy topology model according to a plurality of station side models.
Further, the protection sub-module 12 includes an overcurrent protection secondary sub-module 121, an island protection secondary sub-module 122, and a reverse power protection secondary sub-module 123;
the overcurrent protection secondary submodule 121 is configured to perform overcurrent fault determination according to each grid-connected point current, and when the grid-connected point current exceeds a preset current threshold, trigger the measurement and control module 7 to turn off a grid-connected point switch corresponding to the grid-connected point current exceeding the current threshold;
the island protection secondary sub-module 122 is configured to perform island fault determination according to voltages on two sides of each grid-connected point, and when the voltages on two sides of the grid-connected point exceed a preset voltage threshold, trigger the measurement and control module 7 to turn off a grid-connected point switch corresponding to the voltages on two sides of the grid-connected point exceeding the voltage threshold;
the reverse power protection secondary subunit is used for performing reverse power fault judgment according to the power flow direction of each grid-connected point, and when the power flow direction of the grid-connected point is opposite to the preset flow direction, the measurement and control module 7 is triggered to disconnect the grid-connected point switch corresponding to the reverse power flow grid-connected point.
It should be noted that the purpose of protecting the microgrid in the trigger area and switching off the grid is achieved by triggering the on/off of the grid-connected point switch, and when the grid-connected point switch in the trigger area is turned off to execute the protection action, the energy storage device in the trigger area switches the operation mode to the voltage source mode. The new energy region can guarantee continuous power supply after external isolation.
Further, the power quality monitoring submodule 13 is configured to calculate an unbalance degree of a three-phase voltage, an unbalance degree of a three-phase current, and a voltage deviation of a grid connection point according to the grid connection point data.
Further, the regional autonomous sub-module 14 specifically includes: the power generation rate calculation secondary submodule and the power generation amount scheduling secondary submodule;
the power generation rate calculation secondary submodule is specifically used for calculating the total active power which can be increased, the total active power which can be decreased, the total reactive power which can be increased and the total reactive power which can be decreased of the new energy equipment;
and the generating capacity scheduling secondary submodule is used for adjusting the generating power of the new energy equipment according to the power target parameter received from the main station platform.
Further, the increased total active power is specifically an accumulated sum of differences between preset active power and real-time active power of each new energy device, and the specific formula is as follows:
wherein, Pdis(t) increasing the total active power at time t, Pemi(i, t) is the predicted power of the ith new energy device at the moment t, P (i, t) is the real-time active power of the ith new energy device at the moment t, and N is the total number of the operating new energy devices;
the total active power can be reduced according to the accumulated sum of the real-time active power of the new energy equipment, and the specific formula is as follows:
wherein, Pcha(t) the total active power can be reduced at time t;
the increased total reactive power is specifically the sum of the differences between the preset reactive power and the real-time reactive power of each new energy device, and the specific formula is as follows:
wherein Q isdis(t) increasing the total reactive power at time t, Qmax(i) Rated maximum reactive power of ith new energy equipment is obtained, and Q (i, t) is the real-time reactive power of the ith new energy equipment;
the total reactive power can be reduced, in particular according to the cumulative sum of the differences between the real-time reactive power and the rated minimum reactive power of the new energy device, in particularThe formula is as follows:
wherein Q ischa(t) reducible Total reactive Power at time t, Qmin(i) Rated minimum reactive power of the ith new energy device.
Further, the power generation amount scheduling secondary submodule is specifically configured to:
judging whether power target parameters sent by the master station platform are received or not, if so, adjusting the power generation power of the new energy equipment according to a first target power calculation formula, and if not, adjusting the power generation power of the new energy equipment according to a second target power calculation formula;
wherein, the first target power calculation formula is:
the second target power calculation formula is:
wherein, Prat(i) Rated active power of the ith new energy device, N is total number of total devices of the new energy devices in operation, and Qrat(i) Rated reactive power, P, for the ith new energy deviceSETTarget parameter of active power, Q, emitted for the platform of the master stationSETAnd the target parameters of the reactive power sent by the main station platform.
Further, still include: an HMI interaction module 5;
the HMI interaction module 5 is connected to a data bus 9.
It should be noted that an HMI (Human Machine Interface) interaction module is disposed in the shell of the gateway device in this embodiment, and is used to operate the gateway device.
Further, still include: a storage module 3;
the storage module 3 is connected with the data bus 9 and used for summarizing and storing the data acquired by the communication access module 6 and the measurement and control module 7.
Further, still include: a power supply module 2;
the power module 2 is used for providing electric energy for each module in the lightweight distributed energy gateway device.
The integration of functions such as telecontrol, protection, power quality monitoring, regional autonomous control and the like of gateway equipment can be realized through the invention patent, and the configuration cost of new energy access is reduced;
the interaction with a unified model of the master station system is realized through the established unified station end model through the telecontrol processing function, and the configuration difficulty of the new energy system accessing the master station system is reduced;
the protection function processing function is used for isolating the new energy region from the outside after the fault, the influence of the new energy region on an external power distribution network is reduced, the micro-grid in the protection triggering region can be switched in an off-grid mode, the three-phase voltage data of a grid-connected point, the fundamental wave data of current and the effective value data of 2-25 harmonics can be obtained from the data acquired by the measurement and control module 7 and the communication access module 6 through the power quality monitoring function, the unbalance degree and the voltage deviation of the three-phase voltage and the current can be calculated, and the power supply reliability of the new energy system is comprehensively improved;
the analysis of the power generation capability of the regional power grid and the power generation autonomy of the regional new energy system are realized through the regional autonomy control function, the scheduling requirement of the master station system is met, and conditions are brought to the active power distribution network and the demand side response.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed system and apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A lightweight distributed energy gateway device, comprising: the device comprises a processing module, an uplink transmission module, a communication access module, a measurement and control module, a unified information interface module and a data bus;
the data bus is respectively connected with the processing module, the unified information interface module, the measurement and control module and the communication access module;
the measurement and control module is used for acquiring grid-connected point data of grid-connected points in a preset area and controlling the on-off state of each grid-connected point switch, wherein the grid-connected point data specifically comprises: the grid-connected point switch position, the voltage on two sides of the grid-connected point and the current of the grid-connected point;
the communication access module is used for acquiring equipment data and metering data of new energy equipment in a preset area;
the uplink transmission module is in communication connection with the unified information interface module, wherein the uplink transmission module is used for establishing communication connection with the master station platform;
the processing module specifically comprises: the system comprises a telecontrol submodule, a protection submodule, an electric energy quality monitoring submodule and an area autonomy submodule;
the regional autonomous submodule specifically includes: the power generation rate calculation secondary submodule and the power generation amount scheduling secondary submodule;
the power generation rate calculation secondary submodule is specifically used for calculating the total available power, the total reactive power and the total reactive power of the new energy equipment;
the generating capacity scheduling secondary submodule is used for adjusting the generating power of the new energy equipment according to the power target parameter received from the main station platform;
the power generation amount scheduling secondary submodule is specifically used for:
judging whether power target parameters sent by a master station platform are received or not, if so, adjusting the power generation power of the new energy equipment according to a first target power calculation formula, and if not, adjusting the power generation power of the new energy equipment according to a second target power calculation formula;
wherein the first target power calculation formula is:
the second target power calculation formula is:
wherein, Prat(i) Rated active power of the ith new energy device, N is the total number of the new energy devices in operation, and Qrat(i) Rated reactive power, P, for the ith new energy deviceSETTarget parameter of active power, Q, emitted for the platform of the master stationSETAnd the target parameters of the reactive power sent by the main station platform.
2. The lightweight distributed energy gateway device according to claim 1, wherein the telemechanical sub-module is specifically configured to construct an IEC 61850-based station-side model according to the grid-connected point data and the device data and metering data of the new energy device.
3. The lightweight distributed energy gateway device of claim 1, wherein said protection sub-modules comprise an overcurrent protection secondary sub-module, an island protection secondary sub-module, and a reverse power protection secondary sub-module;
the overcurrent protection secondary submodule is used for judging overcurrent faults according to the grid-connected point currents, and when the grid-connected point currents exceed a preset current threshold, the measurement and control module is triggered to disconnect the grid-connected point switches corresponding to the grid-connected point currents exceeding the current threshold;
the island protection secondary submodule is used for carrying out island fault judgment according to voltages on two sides of each grid-connected point, and when the voltages on the two sides of the grid-connected points exceed a preset voltage threshold, the measurement and control module is triggered to disconnect the grid-connected point switches corresponding to the voltages on the two sides of the grid-connected points exceeding the voltage threshold;
and the reverse power protection secondary subunit is used for carrying out reverse power fault judgment according to the power flow direction of each grid-connected point, and when the power flow direction of the grid-connected point is opposite to the preset flow direction, the measurement and control module is triggered to disconnect the grid-connected point switch corresponding to the reverse power flow.
4. The lightweight distributed energy gateway device according to claim 1, wherein the power quality monitoring submodule is configured to calculate an imbalance of three-phase voltages, an imbalance of three-phase currents, and a voltage deviation of the grid-connected point according to the grid-connected point data.
5. The gateway device of claim 1, wherein the increasable total active power is a cumulative sum of differences between preset active power and real-time active power of each new energy device;
the reducible total active power is specifically based on the accumulated sum of the real-time active power of the new energy device;
the total reactive power can be increased, specifically, the sum of the differences between the rated maximum reactive power and the real-time reactive power of each new energy device is added;
the reducible total reactive power is specifically based on an accumulated sum of differences between real-time reactive power and rated minimum reactive power of the new energy device.
6. The lightweight distributed energy gateway device of claim 1, further comprising: an HMI interaction module;
the HMI interaction module is connected with the data bus.
7. The lightweight distributed energy gateway device of claim 1, further comprising: a storage module;
the memory module is connected with the data bus.
8. The lightweight distributed energy gateway device of claim 1, further comprising: a power supply module;
the power module is used for providing electric energy for each module in the lightweight distributed energy gateway equipment.
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| CN109004751A (en) | 2018-12-14 |
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