CN111431209B - Grid-connected power generation anti-reflux system and method thereof, computer equipment and storage medium - Google Patents
Grid-connected power generation anti-reflux system and method thereof, computer equipment and storage medium Download PDFInfo
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- CN111431209B CN111431209B CN202010339040.4A CN202010339040A CN111431209B CN 111431209 B CN111431209 B CN 111431209B CN 202010339040 A CN202010339040 A CN 202010339040A CN 111431209 B CN111431209 B CN 111431209B
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- 238000010248 power generation Methods 0.000 title claims abstract description 149
- 230000000151 anti-reflux effect Effects 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 40
- 230000002265 prevention Effects 0.000 claims abstract 2
- 238000004891 communication Methods 0.000 claims description 47
- 238000004590 computer program Methods 0.000 claims description 12
- 230000002776 aggregation Effects 0.000 claims description 11
- 238000004220 aggregation Methods 0.000 claims description 11
- 239000002699 waste material Substances 0.000 abstract description 8
- 238000010992 reflux Methods 0.000 abstract description 7
- 230000001276 controlling effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 230000002269 spontaneous effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/001—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of incorrect or interrupted earth connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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Abstract
The invention relates to the technical field of grid-connected power generation, and discloses a grid-connected power generation countercurrent prevention system and method, computer equipment and a storage medium. And monitoring the electric signals at the grid-connected point, when the countercurrent occurs, switching off the grid-connected point switch, calculating the electric energy required by the user load by analyzing the real-time electric signals at the acquired property boundary point, and judging the maximum input of the power generation unit in the system according to logic analysis, wherein the generated electric energy cannot exceed the requirement of the user load to cause the countercurrent phenomenon. And executing operation according to the analysis result, disconnecting the collection line of the redundant power generation units, closing the grid-connected point switch and providing the required electric energy for the user. The grid-connected power generation anti-reflux system provided by the invention can ensure that new energy power generation of the system is consumed by users to the maximum extent under the condition of ensuring no reflux, avoid the phenomenon of serious waste of power generation resources and improve the economic benefit of the system.
Description
Technical Field
The invention relates to the technical field of grid-connected power generation, in particular to a grid-connected power generation anti-reflux system and a method thereof, computer equipment and a storage medium.
Background
Most of the existing spontaneous self-use mode photovoltaic power generation projects adopt an inverse power control cabinet, and the power of the title demarcation point is monitored and logically compared with a set control power fixed value, so that the power output of an inverter is regulated or a photovoltaic power generation system is cut off. The reverse power protection device can achieve the purpose of preventing reverse flow, but when the protection device acts when reverse power occurs, serious waste of photovoltaic power generation can be caused by directly switching off the grid-connected point switch.
Disclosure of Invention
Based on the above, it is necessary to provide a grid-connected power generation anti-reflux system and a method thereof, a computer device and a storage medium for solving the problem that the connection of a photovoltaic power generation system is directly cut off when the existing spontaneous self-use mode photovoltaic power generation project encounters a reflux condition, so that the serious waste of photovoltaic power generation resources is caused.
The grid-connected power generation anti-reflux system comprises at least one power generation unit, wherein the at least one power generation unit is connected with a user load bus through a grid-connected cabinet, and the grid-connected cabinet is used for collecting electric energy output by the power generation unit and inputting the electric energy into the user load bus; the at least one power generation unit is connected with the connecting passage of the grid-connected cabinet to form at least one collecting line; the connection point of the grid-connected cabinet and the user load bus is a title demarcation point; the anti-backflow relay protection device is connected with the title demarcation point and is used for collecting and monitoring the electric signals at the title demarcation point in real time, and when the electric signals at the title demarcation point are in backflow, a connecting passage between the grid-connected cabinet and the user load bus is disconnected; the collection control unit is connected with the power generation unit and used for collecting the electric energy output by the power generation unit in real time; the analysis control module is respectively connected with the at least one acquisition control unit and the anti-backflow relay protection device and is used for outputting control signals according to the electric signals at the title boundary points and the effective power generation amount; the acquisition control unit is also used for controlling the on-off of the collecting line according to the control signal; and the anti-backflow relay protection device is also used for controlling the on-off between the grid-connected cabinet and the user load bus according to the control signal.
In one embodiment, the grid-connected power generation anti-reflux system further comprises a communication module, which is respectively connected with the analysis control module, the at least one acquisition control unit and the anti-reflux relay protection device, and is used for respectively establishing communication connection between the analysis control module and the at least one acquisition control unit and communication connection between the analysis control module and the anti-reflux relay protection device.
In one embodiment, the communication module comprises a wired communication module or/and a wireless communication module.
In one embodiment, the acquisition control unit comprises a circuit breaker.
The utility model provides a grid-connected power generation anti-reflux method, is applied to grid-connected power generation anti-reflux system, the grid-connected power generation anti-reflux system includes at least one power generation unit and grid-connected cabinet, the at least one power generation unit is connected with user load busbar through the grid-connected cabinet, the connecting channel that at least one power generation unit lets in the grid-connected cabinet constitutes at least one collecting line, the connecting point that grid-connected cabinet lets in the user load busbar is title demarcation point, the method includes carrying out real-time collection and monitoring to the electrical signal of title demarcation point, when the electrical signal of title demarcation point appears in countercurrent, break off the connecting channel between grid-connected cabinet and the user load busbar; monitoring the working state of the at least one collecting line, and obtaining the effective power generation amount of the system; comparing the effective power generation amount with real-time power at the title demarcation point; when the effective generating capacity is smaller than the real-time power at the title demarcation point, a connecting passage between the grid-connected cabinet and the user load bus is conducted; and when the effective generating capacity is larger than the real-time power at the title demarcation point, disconnecting the passage of one of the collecting lines until the effective generating capacity is smaller than the real-time power at the title demarcation point.
In one embodiment, the monitoring the working state of the at least one collecting line includes monitoring the at least one collecting line in real time, and judging whether the at least one collecting line is in an electric energy output state; and acquiring the preset generated energy of the collecting line in the electric energy output state.
In one embodiment, the effective power generation amount of the system is the sum of preset power generation amounts of the collecting lines in the power generation state.
In one embodiment, before disconnecting one of the aggregation lines, presetting different priorities for the at least one aggregation line; when one of the aggregation lines is disconnected, the aggregation line with the higher priority is disconnected preferentially.
A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the grid-tie power generation anti-reflux method of any of the above embodiments.
A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the grid-tie power generation anti-reflux method of any one of the above embodiments.
According to the grid-connected power generation anti-reflux system, the electric signals at the grid-connected points are monitored, the grid-connected point switch is disconnected when reflux occurs, the required electric energy of the user load is calculated by checking the real-time electric signals at the title collection boundary points, and the generated electric energy cannot cause the reflux phenomenon when the maximum input of the power generation units in the system is judged according to logic analysis. And executing operation according to the analysis result, disconnecting the collection line of the redundant power generation units, closing the grid-connected point switch and providing the required electric energy for the user. The grid-connected power generation anti-reflux system provided by the invention can ensure that new energy power generation of the system is consumed by users to the maximum extent under the condition of ensuring no reflux, avoid the phenomenon of serious waste of power generation resources and improve the economic benefit of the system.
Drawings
FIG. 1 is a block diagram of a grid-connected power generation anti-reflux system according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a connection of a grid-connected power generation anti-reflux system according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for preventing reverse flow in grid-connected power generation according to one embodiment of the invention;
FIG. 4 is a flow chart of a method for monitoring the working state of a collecting line according to one embodiment of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The existing photovoltaic power generation inverse power control system is mainly used for monitoring voltage and current of a title demarcation point and adjusting the output of an inverter in a communication mode. However, the scheme is only suitable for projects with the single capacity below 500kWp, is not suitable for large-scale enterprises and mining enterprises with larger loads, and is not beneficial to improving the level of photovoltaic power generation and consumption of redundant electric energy generated by a power generation unit without any place if the reverse power protection device directly breaks off the grid-connected point switch, so that the waste of photovoltaic power generation resources is caused.
The invention designs an anti-reflux scheme based on a SCADA (Supervisory Control And Data Acquisition, data acquisition and monitoring control system) computer monitoring system, develops a new functional module on the basis of SCADA monitoring software provided by a manufacturer, and is matched with an anti-reflux power relay protection device, so that the anti-reflux capacity of a user for generating power of new energy is improved. The grid-connected power generation anti-reflux system provided by the invention can be used for the project that spontaneous self-use residual electricity with the monomer capacity of 6-20 MWp is forbidden to be connected with the network in 10kV and 35kV grid connection, and also can be used for the project that the monomer capacity is below 500kWp and the low-voltage grid connection is realized.
Fig. 1 is a block diagram of a grid-connected power generation anti-backflow system according to an embodiment of the present invention, where in one embodiment, the grid-connected power generation anti-backflow system includes at least one power generation unit 100, a grid-connected cabinet 200, an anti-backflow relay protection device 300, at least one collection control unit 400, and an analysis control module 500. The at least one power generation unit 100 is connected with a user load bus through a grid-connected cabinet 200, and the grid-connected cabinet 200 is used for collecting electric energy output by the power generation unit 100 and inputting the electric energy into the user load bus; the connection path of the at least one power generation unit 100 to the grid-connected cabinet 200 forms at least one collecting line; the connection point of the grid-connected cabinet 200 and the user load bus is a title demarcation point. The anti-backflow relay protection device 300 is connected with the title demarcation point, and is used for collecting and monitoring the electric signal at the title demarcation point in real time, and disconnecting the connection path between the grid-connected cabinet 200 and the user load bus when the electric signal at the title demarcation point is in backflow. The at least one collection control unit 400 is connected to the power generation unit 100, and is configured to collect the electric energy output by the power generation unit 100 in real time. The analysis control module 500 is respectively connected with the at least one collection control unit 400 and the anti-backflow relay protection device 300, and is used for outputting control signals according to the electric signals at the title demarcation point and the effective power generation amount. The collection control unit 400 is further configured to control on-off of the collecting line according to the control signal; the anti-backflow relay protection device 300 is further configured to control on-off between the grid-connected cabinet 200 and the user load bus according to the control signal.
Specifically, the at least one power generation unit 100 is configured to generate new energy to provide electric energy for a user load, and collect the electric energy generated by all the power generation units 100 in the grid-connected cabinet 200 in a grid-connected manner, and output the collected electric energy to a user load bus. The title demarcation point refers to a demarcation point where the maintenance management range of the power supply department and the user electrical equipment is divided according to the attribution of the title, and in this embodiment, the title demarcation point is defined as a connection point between the grid-connected cabinet 200 and the user load bus. The anti-backflow relay protection device 300 monitors voltage and current at the title demarcation point. The direction of transmission of electrical energy from the system to the user load is defined as the forward direction. When the current is reversely sent to the power grid, the anti-backflow relay protection device 300 turns off the grid-connected point switch of the grid-connected cabinet 200 and transmits the voltage and current detected in real time at the title demarcation point to the analysis control module 500.
The analysis control module 500 in this embodiment is a computer equipped with a SCADA monitoring system. The SCADA monitoring system calculates forward power according to the voltage and current received in real time at the title demarcation point, namely the total amount of electric energy which can be consumed by a user; and calculating the quantity of the collection lines of the power generation unit 100 to be input according to the forward power, and ensuring that the total power generation quantity of the input collection lines is smaller than the forward power of the title demarcation point. At this time, the SCADA monitoring system outputs a control signal to the collection control unit 400, and the collection control unit 400 sequentially and automatically performs an operation of disconnecting the corresponding collecting line. Finally, the SCADA monitoring system outputs a control signal to the anti-backflow relay protection device 300 to execute the operation of switching on and off the merging points. The grid-connected power generation anti-reflux system avoids the reflux phenomenon caused by surplus power output by controlling the total power output by the system to be smaller than the power required by the load of a user, and also avoids the condition of energy waste caused by directly disconnecting a grid-connected point switch after the reflux phenomenon is generated.
Fig. 2 is a schematic diagram of a specific connection of a grid-connected power generation anti-backflow system according to an embodiment of the present invention, where in one embodiment, the grid-connected power generation anti-backflow system further includes a communication module 600. The communication module 600 is respectively connected with the analysis control module 500, the at least one collection control unit 400 and the anti-backflow relay protection device 300, and is used for respectively establishing communication connection between the analysis control module 500 and the at least one collection control unit 400 and communication connection between the analysis control module 500 and the anti-backflow relay protection device 300. When the anti-backflow relay protection device 300 monitors the title demarcation point in real time and finds that the backflow phenomenon occurs, the anti-backflow relay protection device 300 turns off the grid-connected point switch of the grid-connected cabinet 200 and transmits the electric signal at the title demarcation point acquired in real time to the analysis control module 500 through the communication module 600. The analysis control module 500 calculates and obtains the forward power of the title demarcation point according to the electric signal. At this time, the acquisition control unit 400 transmits the monitoring condition of the power generation unit 100 to the analysis control module 500 through the communication module 600. The analysis control module 500 determines which of the power generation units 100 are in the power input state, and obtains a preset power generation amount of the power generation unit 100 in the power input state. The analysis control module 500 determines which power generation units 100 are put into to ensure that the total power output by the system is smaller than the power required by the load of the user according to the magnitude of the forward power and the condition of the power generation units 100, and outputs a control signal to the acquisition control unit 400. The collection control unit 400 controls the corresponding collection paths of the power generation units 100 in the grid-connected cabinet according to the control signals. Finally, the analysis control module 500 outputs a control signal to the anti-backflow relay protection device 300 through the communication module 600, and the anti-backflow relay protection device 300 closes the grid-connected point switch of the grid-connected cabinet 200 according to the control signal. The maximum power generation amount of the new energy in the system can be ensured to be completely consumed by the load of the user, and then the new energy power station is put into the new energy power station again, so that the purpose of ensuring the consumption level of the new energy by the user is achieved.
In one embodiment, the communication module 600 includes a wired communication module or/and a wireless communication module. The communication module 600 of the grid-connected power generation anti-reflux system may be a wired communication module or a wireless communication module, or may include both a wired communication module and a wireless communication module. If the communication module 600 uses a wired communication module to realize the communication connection between the analysis control module 500 and the collection control unit 400 and the anti-backflow relay protection device 300, the wired communication module is less interfered, and has strong reliability and strong confidentiality. If the communication module 600 uses a wireless communication module to realize the communication connection between the analysis control module 500 and the collection control unit 400 and the anti-backflow relay protection device 300, the wireless communication module is not constrained by a connection line, and is flexible in networking and good in expandability. If the communication module 600 includes both a wired communication module and a wireless communication module, a more appropriate communication mode may be selected to implement communication connection according to the application requirements. In this embodiment, the grid-connected power generation anti-backflow system uses ethernet to realize communication connection between the analysis control module 500 and the collection control unit 400 and the anti-backflow relay protection device 300, respectively. The original monitoring network in the transformer substation is utilized for communication, a communication cable is not required to be newly added, the communication network in the transformer substation is an Ethernet, and the communication mode is stable and reliable.
In one embodiment, the acquisition control unit 400 includes a circuit breaker. The analysis control module 500 determines which power generation units 100 are put into to ensure that the total electric energy output by the system is smaller than the electric energy required by the load of the user according to the forward power and the conditions of the power generation units 100, and then outputs a control signal to the acquisition control unit 400. The collection control unit 400 controls the switching on and off of the collecting paths of the corresponding power generation units 100 in the grid-connected cabinet according to the control signals to control the switching on and off of the circuit breakers. The power consumption level of the user load is adapted by reducing the power generation of the power generation unit 100, so that the situation of energy waste caused by directly switching off the grid-connected point switch after the reverse flow phenomenon is generated is avoided.
The invention also provides a grid-connected power generation anti-reflux method which is applied to the grid-connected power generation anti-reflux system. The grid-connected power generation anti-reflux system comprises at least one power generation unit 100 and a grid-connected cabinet 200, wherein the at least one power generation unit is connected with a user load bus through the grid-connected cabinet, a connecting passage of the at least one power generation unit, which is introduced into the grid-connected cabinet, forms at least one collecting line, and a connecting point of the grid-connected cabinet, which is introduced into the user load bus, is a title demarcation point. Fig. 3 is a flowchart of a grid-connected power generation anti-backflow method according to an embodiment of the present invention, and in one embodiment, the method includes the following steps S100 to S500.
S100: and acquiring and monitoring the electric signals at the title boundary point in real time, and disconnecting a connection path between the grid-connected cabinet and the user load bus when the electric signals at the title boundary point are in countercurrent.
S200: and monitoring the working state of the at least one collecting line, and obtaining the effective power generation amount of the system.
S300: and comparing the effective generated energy with the real-time power at the title demarcation point.
S400: and when the effective generating capacity is smaller than the real-time power at the title demarcation point, a connecting passage between the grid-connected cabinet and the user load bus is conducted.
S500: and when the effective generating capacity is larger than the real-time power at the title demarcation point, disconnecting the passage of one of the collecting lines until the effective generating capacity is smaller than the real-time power at the title demarcation point.
Specifically, the grid-connected power generation anti-reflux system disclosed by the invention is built in a new energy power station which can self-use and inhibit residual electricity from surfing the internet, and comprises at least one power generation unit 100, a grid-connected cabinet 200, an anti-reflux relay protection device 300, at least one acquisition control unit 400 and an analysis control module 500. In this embodiment, the analysis control module 500 is a computer equipped with a SCADA monitoring system, five power generation units 100 in the system, and the connection paths of each power generation unit 100 to the grid-connected cabinet form a collection line, and the five collection lines are shown in fig. 2 as photovoltaic collection lines 1 to 5, and the collection control unit 400 is formed by a line protection measurement and control device and a circuit breaker, but the above description should not be construed as limiting the scope of protection of the present invention.
Under the normal operation condition of the system, the user load preferentially consumes the new energy power generated by the system, when the new energy power generation capacity of the system is completely consumed by the user load, the user load additionally obtains power from the power grid, at this time, the anti-backflow relay protection device 300 obtains power P acquired from the title demarcation point, which is the power obtained from the power grid, in the positive direction (the power is directed from the system to the user and defined as the positive direction).
When the user load is reduced, the power P obtained from the power grid is reduced on the basis of preferentially eliminating the new energy power generation. When the user load is reduced to the point that the electric quantity required by the user load is provided by the new energy power generation and the new energy power generation capacity remains, the remaining electric quantity is returned to the power grid through the title demarcation point, and at the moment, reverse current occurs and the power P of the title demarcation point is a negative value. When the anti-backflow relay protection device 300 detects that the backflow occurs at the title demarcation point, the anti-backflow relay protection device 300 turns off the grid-connected point switch at the grid-connected cabinet 200, that is, turns off the connection path between the grid-connected cabinet 200 and the user load bus. After the grid-connected point switch is disconnected, the electric energy required by the user load is obtained from the power grid again, at this time, the anti-backflow relay protection device 300 can collect a larger positive real-time power P at the title demarcation point, and the real-time power P at this time is the electric energy level that can be consumed by the user load. The anti-backflow relay protection device 300 transmits the real-time power P to the SCADA monitoring system.
The SCADA monitoring system acquires the electric energy condition of the power generation unit 100 acquired by the acquisition control unit 400 in real time, and acquires the total effective power generation amount of the system. And the SCADA monitoring system compares the effective power generation amount with the real-time power P at the title demarcation point and judges whether the effective power generation amount of the system can be completely consumed by the user load. If the effective power generation amount is smaller than the real-time power P at the title demarcation point, it indicates that the electric energy generated by the system is within the consumption level of the user load at this time, and no phenomenon of countercurrent caused by residual electric quantity can occur, at this time, the SCADA monitoring system outputs a control signal to the anti-countercurrent relay protection device 300, and the anti-countercurrent relay protection device 300 closes a grid-connected point switch at the grid-connected cabinet 200 according to the control signal, namely, a connection path between the grid-connected cabinet and the user load bus is conducted. If the effective power generation amount is larger than the real-time power P at the title demarcation point, the electric energy generated by the system is larger than the consumption level of the user load, and if the grid-connected point switch is closed, the phenomenon of countercurrent caused by surplus new energy power output by the system still occurs, and a new energy circuit generated by the system needs to be reduced. The SCADA monitoring system judges which power generation units 100 need to be disconnected according to the real-time power P at the title demarcation point and the preset power generation amount of each power generation unit 100 in the input state so that the electric energy generated by the system is within the consumption level of the user load, and transmits a control signal to the acquisition control unit 400. The acquisition control unit 400 disconnects the path of one of the collection lines according to the control signal until the effective power generation amount of the system is smaller than the real-time power P at the title demarcation point. The total electric energy output by the system is controlled within the level which can be consumed by the user load, so that the phenomenon of countercurrent caused by surplus electric energy output is avoided, and the situation of energy waste caused by directly switching off the grid-connected point switch after the countercurrent phenomenon is generated is also avoided.
Fig. 4 is a flowchart of a method for monitoring the working status of a collection line according to an embodiment of the present invention, in which the monitoring the working status of the at least one collection line includes steps S210 to S220.
S210: and monitoring the at least one collecting line in real time, and judging whether the at least one collecting line is in an electric energy output state.
S220: and acquiring the preset generated energy of the collecting line in the electric energy output state.
Specifically, after the grid-connected point switch is turned off, the collection control unit 400 transmits the condition of the power generation unit 100 collected in real time to the SCADA monitoring system. The SCADA monitoring system determines whether each of the power generation units 100 is in an electric power generation state or not, and whether each of the collection lines is in an input state or not. Screening all the collecting lines in the electric energy output state, and acquiring preset generated energy of all the collecting lines in the electric energy output state, so that the SCADA monitoring system can acquire the total effective generated energy of the system, and judging which electric generating units 100 need to be disconnected according to the real-time power P at the title demarcation point and the preset generated energy of each electric generating unit 100 in the input state so that the electric energy generated by the system is within the consumption level of the user load.
In one embodiment, the effective power generation amount of the system is the sum of preset power generation amounts of the collecting lines in the power generation state. And calculating the maximum power generation amount Ps of the collecting line in the input state, wherein the maximum power generation amount Ps is defined as the effective power generation amount of the system, and Ps is the sum P s＝∑Pi of the maximum power generation amounts of all the collecting lines in the combined state of the circuit breaker. Pi is a preset maximum power generation amount fixed value of each converging line in a converging state. For example, the system has 5 total collecting lines, and when the SCADA monitoring system detects that the 1 st collecting line, the 2 nd collecting line and the 4 th collecting line are in a combined state, the maximum power generation amount of new energy of the system is P s＝P1+P2+P4 at the moment.
In one embodiment, before disconnecting one of the aggregation lines, presetting different priorities for the at least one aggregation line; when one of the aggregation lines is disconnected, the aggregation line with the higher priority is disconnected preferentially. The SCADA monitoring system sets different priorities for each of the aggregation lines in advance. And when judging which power generation units 100 need to be disconnected so that the electric energy generated by the system is within the consumption level of the user load, preferentially disconnecting the collecting line with high priority, calculating the effective generating capacity of the system at the moment and comparing the effective generating capacity with real-time power P, and if the effective generating capacity of the system is still larger than the real-time power P, continuing to disconnect the collecting line with higher priority. And circulating the steps until the effective power generation amount of the system is smaller than the real-time power P, namely indicating that the electric energy generated by the system is within the consumption level of the user load at the moment, and if a grid-connected point switch is closed, the phenomenon of countercurrent caused by residual electric quantity is avoided.
The SCADA monitoring system can also set the total number of the collecting lines of the system, adjust the voltage and the electrorheological ratio of each line to complete the parameter setting of the system, set the maximum generating capacity Pi of each collecting line to complete the generating capacity setting of the collecting line and set the priority of each collecting line (the priority of each collecting line cannot be set the same) to complete the switching priority setting of the collecting line. In addition, the SCADA monitoring system can also display a fixed value for displaying the fixed value (the fixed value cannot be set and changed and is mainly used for checking and checking); fixed value printing, which is used for printing fixed value sheets; the title demarcation points Ps are displayed and are used for displaying real-time sampling data of the title demarcation points; the collection line switching remote control point association is used for associating the corresponding number with the remote control measuring point of the collection line protection measuring and controlling device, so that the logic execution of remote control operation is facilitated; report display for displaying real-time and historical event reports; report printing, which is used for printing a historical event report; and clearing the record for clearing the history report.
The invention also provides computer equipment, which comprises a memory and a processor, wherein the memory stores a computer program, and the computer equipment is characterized in that the processor realizes the steps of the grid-connected power generation anti-reflux method in any one of the embodiments when executing the computer program.
The present invention also provides a computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the grid-connected power generation anti-reflux method of any of the above embodiments.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A grid-tie power generation anti-reflux system, comprising:
The system comprises at least one power generation unit, a user load bus and a power supply unit, wherein the at least one power generation unit is connected with the user load bus through a grid-connected cabinet, and the grid-connected cabinet is used for collecting electric energy output by the power generation unit and inputting the electric energy into the user load bus; the at least one power generation unit is connected with the connecting passage of the grid-connected cabinet to form at least one collecting line; the connection point of the grid-connected cabinet and the user load bus is a title demarcation point;
The anti-backflow relay protection device is connected with the title demarcation point and is used for collecting and monitoring the electric signals at the title demarcation point in real time, and when the electric signals at the title demarcation point are in backflow, a connecting passage between the grid-connected cabinet and the user load bus is disconnected;
The collection control unit is connected with the power generation unit and used for collecting the electric energy output by the power generation unit in real time;
the analysis control module is respectively connected with the at least one acquisition control unit and the anti-backflow relay protection device and is used for outputting control signals according to the electric signals at the title boundary points and the effective power generation amount;
The acquisition control unit is also used for controlling the on-off of the collecting line according to the control signal; and the anti-backflow relay protection device is also used for controlling the on-off between the grid-connected cabinet and the user load bus according to the control signal.
2. The grid-tie power anti-reflux system according to claim 1, further comprising:
The communication module is respectively connected with the analysis control module, the at least one acquisition control unit and the anti-backflow relay protection device and is used for respectively establishing communication connection between the analysis control module and the at least one acquisition control unit and communication connection between the analysis control module and the anti-backflow relay protection device.
3. The grid-tie power anti-reflux system according to claim 2, wherein the communication module comprises a wired communication module or/and a wireless communication module.
4. A grid-connected power generation anti-reflux system according to any one of claims 1 to 3, wherein the acquisition control unit comprises a circuit breaker.
5. The utility model provides a grid-connected power generation anti-reflux method which is characterized in that is applied to grid-connected power generation anti-reflux system, grid-connected power generation anti-reflux system includes at least power generation unit and grid-connected cabinet, at least power generation unit is connected with user load busbar through the grid-connected cabinet, at least power generation unit lets in the connecting channel of grid-connected cabinet constitutes at least one collection line, the tie point that the grid-connected cabinet lets in the user load busbar is the title demarcation point, the method includes:
Collecting and monitoring the electric signals at the title boundary points in real time, and disconnecting a connecting passage between the grid-connected cabinet and the user load bus when the electric signals at the title boundary points are in countercurrent;
Monitoring the working state of the at least one collecting line, and obtaining the effective power generation amount of the system;
comparing the effective power generation amount with real-time power at the title demarcation point;
When the effective generating capacity is smaller than the real-time power at the title demarcation point, a connecting passage between the grid-connected cabinet and the user load bus is conducted;
And when the effective generating capacity is larger than the real-time power at the title demarcation point, disconnecting the passage of one of the collecting lines until the effective generating capacity is smaller than the real-time power at the title demarcation point.
6. The grid-tie power anti-reflux method according to claim 5, wherein said monitoring the operating state of the at least one collection line comprises:
Monitoring the at least one collecting line in real time, and judging whether the at least one collecting line is in an electric energy output state or not;
And acquiring the preset generated energy of the collecting line in the electric energy output state.
7. The grid-connected power generation anti-reflux method according to claim 6, wherein the effective power generation amount of the system is a sum of preset power generation amounts of the collecting lines in the power generation state.
8. The grid-connected power generation reverse flow prevention method according to claim 5, further comprising, before disconnecting the passage of one of the collecting lines:
Presetting different priorities for the at least one collecting line; when one of the aggregation lines is disconnected, the aggregation line with the higher priority is disconnected preferentially.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 5 to 8 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 5 to 8.
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| CN211981515U (en) * | 2020-04-26 | 2020-11-20 | 协鑫能源工程有限公司 | Grid-connected power generation anti-reflux system |
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| CN103236718B (en) * | 2013-03-26 | 2014-12-31 | 东北大学 | Source-network-load automatic control system and method for intelligent microgrid |
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| CN103269084A (en) * | 2013-03-28 | 2013-08-28 | 上海空间电源研究所 | Anti-reflux control device and photovoltaic energy storage connecting grid power generation method thereof |
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