CN115603375B - Off-grid output port control method and device based on optical storage power generation system - Google Patents

Off-grid output port control method and device based on optical storage power generation system Download PDF

Info

Publication number
CN115603375B
CN115603375B CN202211595973.5A CN202211595973A CN115603375B CN 115603375 B CN115603375 B CN 115603375B CN 202211595973 A CN202211595973 A CN 202211595973A CN 115603375 B CN115603375 B CN 115603375B
Authority
CN
China
Prior art keywords
power
output
value
power generation
generation system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202211595973.5A
Other languages
Chinese (zh)
Other versions
CN115603375A (en
Inventor
尹聪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Foxess Co ltd
Original Assignee
Foxess Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Foxess Co Ltd filed Critical Foxess Co Ltd
Priority to CN202211595973.5A priority Critical patent/CN115603375B/en
Publication of CN115603375A publication Critical patent/CN115603375A/en
Application granted granted Critical
Publication of CN115603375B publication Critical patent/CN115603375B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/10—The network having a local or delimited stationary reach
    • H02J2310/12—The local stationary network supplying a household or a building
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application discloses a control method and a device of an off-grid output port based on a light storage power generation system, and relates to the technical field of photovoltaic power supplies, wherein the method comprises the following steps: if the optical storage power generation system detects power failure of a power grid, determining whether the optical storage power generation system is connected with an energy storage battery; if the energy storage battery is connected, determining the target power margin value to be one of the following values according to the state of charge value of the energy storage battery: a first power margin value, a second power margin value, a third power margin value, a fourth power margin value; if the energy storage battery is not connected, determining that the target power margin value is a fifth power margin value; and controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority. Through the method and the device, the problem that the accuracy of on-off control of the off-grid output port is low due to the fact that the on-off control of the off-grid output port in the light storage power generation system is achieved through an additional auxiliary device in the related art is solved.

Description

Off-grid output port control method and device based on optical storage power generation system
Technical Field
The application relates to the technical field of photovoltaic power supplies, in particular to a method and a device for controlling an off-grid output port based on a light storage power generation system.
Background
With the cost reduction brought by the technical progress of photovoltaic energy storage (hereinafter referred to as light storage), more and more household users install light storage power generation systems. Fig. 1 is a schematic wiring diagram of a typical optical storage power generation system. Two direct current input ports of the light storage inverter are respectively connected with a photovoltaic and a battery, one alternating current grid-connected output port is connected with a household power distribution cabinet, and the other alternating current off-grid output port is connected to an important load and a common load through a power distribution panel.
Fig. 2 is a schematic block diagram of a parallel off-network port. Based on the optimal consideration of the inverter cost, one phase of the off-network port of the inverter has only one output, namely, L1-Load-N-Load in fig. 2 is one output of the L1 phase, and L2-Load-N-Load is one output of the L2 phase. And the Grid-connected and off-Grid switching circuit is responsible for switching power supply of Grid-connected ports (L1-Grid-N-Grid, L2-Grid-N-Grid) and off-Grid ports under different working conditions through switches (KI 1, KI2, KI3, KL1, KL2, KL3, KG1, KG2 and KG 3). Under the normal working condition of the power grid, all switches of the off-grid switching circuit are closed, the optical storage inverter can supply power to the power grid and an off-grid load, and the power grid can also supply power to an off-grid port. Under the power failure condition of the power grid, the switch of the grid-connected port is disconnected, and at the moment, the inverter supplies power to the off-grid port load.
When the power grid is in power failure, the off-grid output port is a total port, so that when the total load of any phase of the off-grid output port is too heavy, the inverter can carry out power failure protection on the corresponding phase. Such operation processing greatly affects the user experience. In order to solve the problem, the prior art has a technical scheme that an auxiliary device with a controllable load switching switch is additionally arranged outside an off-grid output port, an external controller selects one or more heavy loads in the auxiliary device to be switched out through multiple load trial and error tests, and only the loads allowed by a system are supplied with power. According to the scheme, the external controller cannot be linked with the inverter in real time when switching the load on the auxiliary device in a communication mode, so that the dynamic performance of the system is poor, and multiple trial and error operations are required.
Aiming at the problem that the accuracy of on-off control of an off-grid output port is low due to the fact that on-off control of the off-grid output port in an optical storage power generation system is achieved through an additional auxiliary device in the related art, an effective solution is not provided at present.
Disclosure of Invention
The main purpose of the present application is to provide a method and an apparatus for controlling an off-grid output port based on an optical storage power generation system, so as to solve the problem in the related art that the accuracy of on-off control of the off-grid output port is low due to the fact that the on-off control of the off-grid output port in the optical storage power generation system is implemented by an additional auxiliary device.
In order to achieve the above object, according to one aspect of the present application, a method for controlling an off-grid output port of a light storage and power generation system is provided. The control method is applied to the optical storage power generation system, each phase of an off-grid output port of the optical storage power generation system at least comprises two paths of outputs, and the method comprises the following steps: if the optical storage power generation system detects power failure of a power grid, determining whether the optical storage power generation system is connected with an energy storage battery; if the optical storage power generation system is connected with the energy storage battery, determining that the target power margin value is one of the following values according to the state of charge value of the energy storage battery: a first power margin value, a second power margin value, a third power margin value, and a fourth power margin value, wherein the fourth power margin value is greater than the third power margin value, the third power margin value is greater than the second power margin value, and the second power margin value is greater than the first power margin value; if the optical storage power generation system is not connected with the energy storage battery, determining that the target power margin value is a fifth power margin value, wherein the fifth power margin value is greater than or equal to the fourth power margin value; if each path of output in the off-grid output port is provided with a power supply priority, controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority, wherein if the optical storage power generation system is connected with the energy storage battery, the target path output at least comprises one path of output in the off-grid output port, and if the optical storage power generation system is not connected with the energy storage battery, the target path output comprises each path of output in the off-grid output port.
Further, if the optical storage power generation system is connected with the energy storage battery, a target power margin value is determined to be one of the following values according to the state of charge value of the energy storage battery: before the first, second, third, and fourth power headroom values, the method further comprises: determining a rated power value of an inverter of the optical storage power generation system, and detecting output power output by each path in the off-grid output port to obtain average output power output by each path; calculating the sum of the average output power of each path of output to obtain the average total output power; if the average output total power is larger than the rated power value, judging whether each path of output in the off-grid output port is provided with a power supply priority or not; and if the power supply priority is set for each path of output in the off-grid output port, performing on-off control on each path of output in the off-grid output port according to the power supply priority so as to enable the average total output power to be less than or equal to the rated power value.
Further, after determining whether each output in the off-grid output port has set a power supply priority, the method further includes: and if the power supply priority is not set for each path of output in the off-grid output port, performing on-off control on each path of output in the off-grid output port according to the average output power of each path of output, so that the average output total power is smaller than or equal to the rated power value.
Further, detecting the output power of each output path in the off-grid output port, and obtaining the average output power of each output path includes: detecting output current output by each path in the off-grid output port, and calculating to obtain output power output by each path according to the output current; and performing moving average processing on the output power output by each path according to a preset statistical period to obtain the average output power output by each path.
Further, according to the state of charge value of the energy storage battery, determining that the target power margin value is one of the following values: the first, second, third and fourth power headroom values comprise: if the SOC value is larger than a first preset value, determining that the target power margin value is the first power margin value; if the state of charge value is smaller than or equal to the first preset value and the state of charge value is larger than or equal to a second preset value, determining that the target power margin value is the second power margin value; if the SOC value is smaller than the second preset value and the SOC value is larger than a third preset value, determining that the target power margin value is the third power margin value; and if the state of charge value is smaller than or equal to the third preset value, determining that the target power margin value is the fourth power margin value.
Further, when the optical storage power generation system is not connected to the energy storage battery, if a power supply priority is set for each path of output in the off-grid output port, controlling on/off of a target path of output of the off-grid output port according to the target power margin value and the power supply priority includes: acquiring the average output total power of the off-grid output port and the photovoltaic power generation power value of the optical storage power generation system; calculating according to the average output total power and the photovoltaic power generation power value to obtain a first actual power margin value; and if the first actual power margin value is smaller than the target power margin value, controlling the on-off of each output of the off-grid output port according to the power supply priority so as to enable the first actual power margin value to be smaller than or equal to the target power margin value.
Further, if each output in the off-grid output port is not set with a power supply priority, the method further includes: acquiring the output power of each output path in the off-grid output port; and performing on-off control on each path of output in the off-grid output port according to the average output power of each path of output, so that the average output total power is smaller than or equal to the photovoltaic power generation power value.
Further, when the optical storage power generation system is not connected with the energy storage battery, after the on-off of the target path output of the off-grid output port is controlled according to the target power margin value and the power supply priority, the method further includes: if at least one path of output is in a non-power supply state, periodically performing trial operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system; and if the power supply priority is set for each output in the off-grid output port, controlling the on-off of each output in a non-power supply state according to the power supply priority and the target power margin value.
Further, the periodically probing operation of the photovoltaic power generation power of the optical storage power generation system comprises: judging whether an inverter of the light storage power generation system is in a power limiting mode or not; if the inverter is in a power limiting mode, periodically probing the photovoltaic power generation power of the light storage power generation system according to a first probing period; and if the inverter is not in the limited power mode, periodically probing the photovoltaic power generation power of the light storage power generation system according to a second probing period, wherein the second probing period is smaller than the first probing period.
Further, periodically performing a heuristic operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system comprises: collecting a direct-current bus voltage value of the light storage power generation system to obtain a first voltage value; performing boosting operation on the voltage of the direct current bus according to preset boosting test time to obtain a second voltage value; and calculating the increasable photovoltaic power generation power value of the light storage power generation system according to the first voltage value and the second voltage value.
Further, if a power supply priority is set for each output in the off-grid output port, after controlling the on-off of each output in a non-power supply state according to the power supply priority and the target power margin value, the method further includes: if the voltage of the direct current bus of the optical storage power generation system is detected to be reduced and the duration of the reduction exceeds a preset time period, repeatedly executing the operation that if the power supply priority is set for each path of output in the off-grid output port, the on-off of the target path of output of the off-grid output port is controlled according to the target power margin value and the power supply priority.
Further, when the optical storage power generation system is connected to the energy storage battery, after the on-off of the target path output of the off-grid output port is controlled according to the target power margin value and the power supply priority, the method further includes: if the average output power of at least one path of output is smaller than the rated power value and is in a non-power supply state, and the state of charge value of the energy storage battery is smaller than or equal to a third preset value, periodically performing trial operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system; and if each path of output in the off-grid output port is provided with a power supply priority, controlling the on-off of each path of output in a non-power supply state according to the power supply priority, the charge state value of the energy storage battery and the target power allowance value.
In order to achieve the above object, according to another aspect of the present application, a control device based on an off-grid output port of a light storage power generation system is provided. The device includes: the first determination unit is used for determining whether the optical storage power generation system is connected with an energy storage battery or not if the optical storage power generation system detects power failure of a power grid; the second determining unit is configured to determine, according to the state of charge value of the energy storage battery, that the target power margin value is one of the following values if the optical storage power generation system is connected to the energy storage battery: a first power margin value, a second power margin value, a third power margin value, a fourth power margin value, wherein the fourth power margin value is greater than the third power margin value, the third power margin value is greater than the second power margin value, and the second power margin value is greater than the first power margin value; a third determining unit, configured to determine that the target power margin value is a fifth power margin value if the optical storage power generation system is not connected to the energy storage battery, where the fifth power margin value is greater than or equal to the fourth power margin value; and the first control unit is used for controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority if the power supply priority is set for each path of output in the off-grid output port, wherein the target path output at least comprises one path of output in the off-grid output port if the optical storage power generation system is connected with the energy storage battery, and the target path output comprises each path of output in the off-grid output port if the optical storage power generation system is not connected with the energy storage battery.
Further, the apparatus further comprises: the fourth determining unit is configured to determine, if the optical storage power generation system is connected to the energy storage battery, that the target power margin value is one of the following values according to the state of charge value of the energy storage battery: before a first power margin value, a second power margin value, a third power margin value and a fourth power margin value, determining a rated power value of an inverter of the optical storage power generation system, and detecting output power of each path of output in the off-grid output port to obtain average output power of each path of output; the calculating unit is used for calculating the sum of the average output power of each path of output to obtain the average output total power; the judging unit is used for judging whether each path of output in the off-grid output port is provided with a power supply priority or not if the average output total power is larger than the rated power value; and the second control unit is used for carrying out on-off control on each path of output in the off-grid output port according to the power supply priority if each path of output in the off-grid output port is provided with the power supply priority, so that the average total output power is smaller than or equal to the rated power value.
Further, the apparatus further comprises: and the third control unit is used for performing on-off control on each output in the off-grid output port according to the average output power of each output after judging whether each output in the off-grid output port is provided with the power supply priority or not and if each output in the off-grid output port is not provided with the power supply priority, so that the average total output power is smaller than or equal to the rated power value.
Further, the fourth determination unit includes: the detection module is used for detecting the output current output by each path in the off-grid output port and calculating the output power output by each path according to the output current; and the processing module is used for performing moving average processing on the output power output by each path according to a preset statistical period to obtain the average output power output by each path.
Further, the second determination unit includes: the first determining module is used for determining the target power margin value as the first power margin value if the state of charge value is larger than a first preset value; the second determining module is used for determining the target power margin value as the second power margin value if the state of charge value is smaller than or equal to the first preset value and the state of charge value is larger than or equal to a second preset value; a third determining module, configured to determine that the target power margin value is the third power margin value if the state of charge value is smaller than the second preset value and the state of charge value is greater than a third preset value; and the fourth determining module is used for determining that the target power margin value is the fourth power margin value if the state of charge value is smaller than or equal to the third preset value.
Further, when the light storage and power generation system is not connected with the energy storage battery, the first control unit comprises: the acquisition module is used for acquiring the average output total power of the off-grid output port and the photovoltaic power generation power value of the optical storage power generation system; the first calculation module is used for calculating according to the average output total power and the photovoltaic power generation power value to obtain a first actual power margin value; and the control module is used for controlling the on-off of each path of output of the off-grid output port according to the power supply priority if the first actual power margin value is smaller than the target power margin value, so that the first actual power margin value is smaller than or equal to the target power margin value.
Further, the apparatus further comprises: the obtaining unit is used for obtaining the output power of each path of output in the off-grid output port if the power supply priority is not set in each path of output in the off-grid output port; and the fourth control unit is used for controlling the on-off of each path of output in the off-grid output port according to the average output power of each path of output, so that the average total output power is smaller than or equal to the photovoltaic power generation power value.
Further, the apparatus further comprises: the first operation unit is used for carrying out periodic trial operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system if at least one path of output is in a non-power supply state after controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority when the optical storage power generation system is not connected with the energy storage battery; and the fifth control unit is used for controlling the on-off of each output in a non-power supply state according to the power supply priority and the target power margin value if the power supply priority is set for each output in the off-grid output port.
Further, the operation unit includes: the judging module is used for judging whether an inverter of the light storage power generation system is in a power limiting mode or not; the first operation module is used for periodically performing trial operation on the photovoltaic power generation power of the light storage power generation system according to a first trial period if the inverter is in a power limiting mode; and the second operation module is used for periodically probing the photovoltaic power generation power of the light storage power generation system according to a second probing period if the inverter is not in the power limit mode, wherein the second probing period is smaller than the first probing period.
Further, the first operation unit includes: the acquisition module is used for acquiring a direct-current bus voltage value of the light storage power generation system to obtain a first voltage value; the third operation module is used for performing boosting operation on the voltage of the direct current bus according to preset boosting test time to obtain a second voltage value; and the second calculation module is used for calculating the increasable photovoltaic power generation power value of the light storage power generation system according to the first voltage value and the second voltage value.
Further, the apparatus further comprises: and a sixth control unit, configured to, after controlling, if a power supply priority is set for each output in the off-grid output port, on/off of each output in a non-power supply state according to the power supply priority and the target power margin value, if it is detected that a voltage of a dc bus of the optical storage power generation system decreases and a duration of the decrease exceeds a preset time period, repeatedly perform, if a power supply priority is set for each output in the off-grid output port, controlling, according to the target power margin value and the power supply priority, on/off of the target output in the off-grid output port.
Further, the apparatus further comprises: the second operation unit is used for carrying out periodic trial operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system after controlling the on-off of a target path output of the off-grid output port according to the target power margin value and the power supply priority, if at least one path of output average output power is smaller than the rated power value and is in a non-power supply state, and the state of charge value of the energy storage battery is smaller than or equal to a third preset value; and the seventh control unit is used for controlling the on-off of each path of output in a non-power supply state according to the power supply priority, the charge state value of the energy storage battery and the target power allowance value if each path of output in the off-grid output port is provided with the power supply priority.
In order to achieve the above object, according to an aspect of the present application, there is further provided a processor for executing a program, where the program is executed to perform the method for controlling an off-grid output port of an optical storage power generation system according to any one of the above aspects.
In order to achieve the above object, according to an aspect of the present application, there is also provided an electronic device including one or more processors and a memory, the memory storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the method for controlling an off-grid output port of a light storage and power generation system.
By the application, the following steps are adopted: if the optical storage power generation system detects power failure of a power grid, determining whether the optical storage power generation system is connected with an energy storage battery; if the light storage power generation system is connected with the energy storage battery, determining that the target power margin value is one of the following values according to the state of charge value of the energy storage battery: a first power margin value, a second power margin value, a third power margin value, and a fourth power margin value, wherein the fourth power margin value is greater than the third power margin value, the third power margin value is greater than the second power margin value, and the second power margin value is greater than the first power margin value; if the optical storage power generation system is not connected with the energy storage battery, determining that the target power margin value is a fifth power margin value, wherein the fifth power margin value is greater than or equal to a fourth power margin value; if each path of output in the off-grid output port is provided with a power supply priority, the on-off of the target path output of the off-grid output port is controlled according to the target power margin value and the power supply priority, wherein if the optical storage power generation system is connected with the energy storage battery, the target path output at least comprises one path of output in the off-grid output port, and if the optical storage power generation system is not connected with the energy storage battery, the target path output comprises each path of output in the off-grid output port, so that the problem that the accuracy of on-off control of the off-grid output port is low due to the fact that the on-off of the off-grid output port in the optical storage power generation system is controlled through an additional auxiliary device in the related art is solved. According to the scheme, after the optical storage power generation system detects that the power grid is powered down, the on-off of each output is controlled through the power supply priority and the target power allowance value of each output in the off-grid output port, the off-grid power supply characteristic is optimized, and the effect of improving the accuracy of on-off control of the off-grid output port is achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic diagram of a prior art light storage power generation system;
FIG. 2 is a circuit schematic of a prior art on-grid port;
fig. 3 is a flowchart of a control method for an off-grid output port of a light storage and power generation system according to an embodiment of the present application;
fig. 4 is a schematic circuit diagram of a light storage and power generation system provided according to an embodiment of the present application;
fig. 5 is a schematic diagram of a control device based on an off-grid output port of an optical storage power generation system according to an embodiment of the present application;
fig. 6 is a schematic diagram of an electronic device provided according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention is described below with reference to preferred implementation steps, and fig. 3 is a flowchart of a control method based on an off-grid output port of an optical storage power generation system according to an embodiment of the present application, where the control method is applied to the optical storage power generation system, and each phase of the off-grid output port of the optical storage power generation system includes at least two outputs. As shown in fig. 3, the method comprises the steps of:
step S301, if the light storage power generation system detects power failure of a power grid, determining whether the light storage power generation system is connected with an energy storage battery;
step S302, if the optical storage power generation system is connected to the energy storage battery, determining that the target power margin value is one of the following values according to the state of charge value of the energy storage battery: a first power margin value, a second power margin value, a third power margin value, a fourth power margin value, wherein the fourth power margin value is greater than the third power margin value, the third power margin value is greater than the second power margin value, and the second power margin value is greater than the first power margin value;
step S303, if the optical storage power generation system is not connected with the energy storage battery, determining that the target power margin value is a fifth power margin value, wherein the fifth power margin value is greater than or equal to a fourth power margin value;
step S304, if each path of output in the off-grid output port is provided with a power supply priority, controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority, wherein if the optical storage power generation system is connected with the energy storage battery, the target path output at least comprises one path of output in the off-grid output port, and if the optical storage power generation system is not connected with the energy storage battery, the target path output comprises each path of output in the off-grid output port.
Specifically, the control method is applied to the optical storage power generation system, and each phase of an off-grid output port of the optical storage power generation system at least comprises two paths of outputs. Fig. 4 shows an embodiment of a light storage power generation system provided in the embodiments of the present application. Each phase of the off-net output port includes at least 2 outputs, e.g., L11-Load-N-Load, L21-Load-N-Load, L12-Load-N-Load, and L22-Load-N-Load. And the off-Grid switching circuit is responsible for switching power supply of Grid-connected ports (L1-Grid-N-Grid, L2-Grid-N-Grid) and off-Grid ports under different working conditions through switches (KI 1, KI2, KI3, KL12, KL22, KL11, KL21, KL31, KG1, KG2 and KG 3). The multiple outputs of the off-grid output port can be controlled to be on and off through respective switches (any one of a relay, a contactor, a controllable mechanical or semiconductor switch), each output also has respective current sampling, and therefore the power of the load of the current path can be judged according to data statistics of the sampled currents, so that power supply selection can be carried out when the optical storage system is off-grid. By setting the power supply priority to the multiplexed output of each phase, the distribution can be performed according to the photovoltaic power generation condition. When the photovoltaic power generation power is insufficient, the power is cut off from low to high according to the power supply priority, so that the optimal dynamic response characteristic of the system power supply can be ensured.
Whether the light storage power generation system is connected with the energy storage battery or not influences the follow-up power supply work for the off-grid output port. When the light storage power generation system is connected with the energy storage battery and power failure occurs to a power grid, the light storage inverter can supply power to the off-grid port through the photovoltaic power generation and the energy storage battery. When the light storage power generation system is not connected with the energy storage battery and power failure occurs to a power grid, the light storage inverter can supply power to the off-grid port through photovoltaic power generation.
When the light storage power generation system is connected with an energy storage battery and a power grid is powered down, when the battery capacity is large (for example, the battery SOC is greater than 50%), the battery can stabilize the power fluctuation of photovoltaic power generation to a great extent (for example, the cloud covers the battery panel to cause the power generation power to drop sharply, and the power generation power rises immediately after the cloud drifts away). However, when the battery capacity is too low (for example, SOC is less than 30%), the battery cannot continuously output a large power, and the suppression capability thereof is obviously greatly reduced. Then, in order to prevent frequent power failure due to fluctuation of the generated power, a certain power margin value needs to be reserved to ensure normal operation of the important load. In addition, when the optical storage power generation system is connected with the energy storage battery, different power margin values can be set according to the battery capacity (namely, the state of charge value of the energy storage battery) to better ensure the normal operation of the important load.
The target power margin value of the echelon is designed according to different battery capacities, for example, when the battery SOC is greater than 50%, the power suppression capability is stronger, the target power margin value may be 100% (i.e., the first power margin value described above), that is, no margin is required, when the battery capacity is 30% < SOC <50%, the power suppression capability is weakened, the target power margin value needs to be increased to 120% (i.e., the second power margin value described above), when the battery capacity is 10% < SOC <30%, the power suppression capability is further weakened, the target power margin value needs to be further increased to 150% (i.e., the third power margin value described above), when the battery capacity is 10%, the power suppression capability is not considered, and the target power margin value may be 200% (i.e., the fourth power margin value described above).
When the optical storage power generation system is not connected with the energy storage battery and power failure occurs in the power grid, power can be supplied to the off-grid port only through volt power generation, and therefore, a higher target power margin value needs to be set, for example, the target power margin value is set to be 250% (i.e., the fifth power margin value).
After the target power margin value is determined, whether power supply priority is set for each path of output of an off-grid port of the optical storage power generation system is judged, if the power supply priority is set, each path of output of the off-grid port is cut off from low to high according to the power supply priority when the photovoltaic power generation power is insufficient, namely, the on-off of the target path output of the off-grid output port is controlled according to the target power margin value and the power supply priority, and the operation can better guarantee that the dynamic response characteristic of system power supply is optimal.
In summary, after the optical storage power generation system detects that the power grid is powered down, the on-off of each output is controlled through the power supply priority and the target power margin value of each output in the off-grid output port, so that the off-grid power supply characteristic is optimized, and the effect of controlling the on-off of the off-grid output port accurately is improved.
In the using process of the optical storage power generation system, under a normal condition, the design of the optical storage system requires that the load connected to the off-grid output port by a user is smaller than a limit value, but under an actual condition, especially under the condition that the optical storage power generation system is connected to an energy storage battery, the user may often install an overweight load at the off-grid output port, and when the power grid fails, the normal power supply of the load at the off-grid output port can be ensured, but when the power grid fails, in order to ensure the normal operation of the off-grid output port, the load exceeding a rated power value needs to be cut off first, and the design specifically comprises the following contents:
if the optical storage power generation system is connected with the energy storage battery, determining that the target power margin value is one of the following values according to the state of charge value of the energy storage battery: before the first, second, third, and fourth power headroom values, the method further comprises: determining a rated power value of an inverter of the optical storage power generation system, and detecting output power output by each path in an off-grid output port to obtain average output power output by each path; calculating the sum of the average output power of each path of output to obtain the average output total power; if the average output total power is larger than the rated power value, judging whether each path of output in the off-grid output port is provided with a power supply priority or not; and if each path of output in the off-grid output port is provided with the power supply priority, performing on-off control on each path of output in the off-grid output port according to the power supply priority so as to enable the average total output power to be smaller than or equal to the rated power value.
Detecting output current output by each path in the off-grid output port, and calculating to obtain output power output by each path according to the output current; and carrying out sliding average processing on the output power output by each path according to a preset statistical period to obtain the average output power output by each path.
And if the power supply priority is not set for each path of output in the off-grid output port, performing on-off control on each path of output in the off-grid output port according to the average output power of each path of output, so that the average output total power is smaller than or equal to the rated power value.
Specifically, after the optical storage power generation system detects a power failure of the power grid, if the optical storage power generation system is connected with an energy storage battery, whether the sum of average power values of loads connected to all off-grid output ports exceeds a rated power value of the inverter is judged. The controller of the optical storage power generation system detects the current output by each path in the output port, correspondingly calculates the output power (voltage multiplied by current) of each path, obtains the average output power of each path in a sliding average mode according to a preset statistical period (for example, 10min, 30min, 1h and the like), and calculates the sum of the average output power of each path to obtain the average output total power.
Judging whether the average output total power is greater than a rated power value, if so, judging whether each path of output in the off-grid output port is provided with a power supply priority, and if so: and sequentially removing the load power with low priority from low to high according to the power supply priority until the sum of the remaining load average power does not exceed the rated power of the inverter. If power priority is not set (including no default priority, the same applies below): and sequentially removing the larger load power of each path according to the average output power of each path from large to small until the sum of the remaining load average power does not exceed the rated power of the inverter.
In conclusion, the steps eliminate the non-rated power supply working condition, so that the dynamic characteristic of the system power supply can be better ensured.
When the battery capacity is large (for example, the battery SOC is greater than 50%), the battery can largely stabilize the power fluctuation of photovoltaic power generation. However, when the battery capacity is too low (for example, SOC is less than 30%), the battery cannot continuously output a large power, and its stabilizing ability is significantly reduced. Therefore, different target power margin values need to be set according to the current state of charge value of the energy storage battery to better ensure the normal operation of the off-grid output port, and therefore, according to the state of charge value of the energy storage battery, the target power margin value is determined to be one of the following values: the first, second, third and fourth power headroom values comprise the steps of: if the SOC value is larger than a first preset value, determining that the target power margin value is a first power margin value; if the state of charge value is less than or equal to a first preset value and the state of charge value is greater than or equal to a second preset value, determining the target power margin value as a second power margin value; if the SOC value is smaller than a second preset value and the SOC value is larger than a third preset value, determining that the target power margin value is a third power margin value; and if the SOC value is less than or equal to a third preset value, determining that the target power margin value is a fourth power margin value.
Specifically, the power margin of the echelon is designed according to different SOC values, when the battery SOC is greater than 50% (i.e., the first preset value), the power stabilizing capability is stronger, and the target power margin may be 100%, that is, no margin is required, when the battery capacity is 30% (i.e., the second preset value) or less and the SOC is less than or equal to 50%, the power stabilizing capability is weakened, and the target power margin needs to be increased to 120%, when the battery capacity is 10% (i.e., the third preset value) or less and the SOC is less than 30%, the power stabilizing capability is further weakened, and the target power margin needs to be further increased to 150%, and when the battery capacity is less than or equal to 10%, the power stabilizing capability is considered to be absent, and the target power margin may be 200%. When the ratio of the current photovoltaic power generation power to the load power does not meet the power margin, power supply is cut off according to the preset power supply priority, instantaneous fluctuation of the load and fluctuation of the photovoltaic power generation power are collided through the power margin, and the power supply dynamic characteristics can be optimized by combining the two ideas.
In conclusion, the power supply dynamic characteristics under the working condition of the battery microgrid are optimized by designing the power allowance of the echelon according to different charge state values.
In order to more accurately control the on-off of the target path output of the off-grid output port, when the optical storage power generation system is not connected with an energy storage battery, if each path of output in the off-grid output port is provided with a power supply priority, the on-off of the target path output of the off-grid output port is controlled according to a target power margin value and the power supply priority, and the method comprises the following steps: acquiring the average output total power of an off-grid output port and the photovoltaic power generation power value of the optical storage power generation system; calculating according to the average output total power and the photovoltaic power generation power value to obtain a first actual power margin value; and if the first actual power margin value is smaller than the target power margin value, controlling the on-off of each output of the off-grid output port according to the power supply priority so as to enable the first actual power margin value to be smaller than or equal to the target power margin value.
If the power supply priority is not set for each output path in the off-grid output port, acquiring the output power of each output path in the off-grid output port; and performing on-off control on each output in the off-grid output port according to the average output power of each output, so that the average total output power is smaller than or equal to the photovoltaic power generation power value.
Specifically, after the optical storage power generation system detects a power failure of the power grid, the controller of the optical storage power generation system calls the current photovoltaic power generation power value and the average total output power of all paths of the off-grid output port, then calculates whether the ratio of the photovoltaic power generation power value to the average total output power meets a target power margin value (300%, 250%, 200% and the like can be set), and executes corresponding operations according to results on the basis of combining power supply priorities of all paths:
(1) If the ratio of the photovoltaic power generation power value to the sum of the average output power of all the off-grid ports is larger than or equal to the target power margin value, all the off-grid ports simultaneously supply power; otherwise, taking the step (2);
(2) Calculating whether the ratio of the photovoltaic power generation power value to the average output total power of other paths of the off-grid port without the path with the lowest power supply priority is larger than or equal to a target power margin value or not, and if the ratio meets the requirement, simultaneously supplying power to all the paths except the path with the lowest power supply priority; otherwise, taking the step (3);
(3) Calculating whether the ratio of the photovoltaic power generation power value to the average output total power of other paths of the off-grid port after the path with the lowest power supply priority and the path with the next lowest power supply priority is removed is larger than or equal to a target power margin value or not, and if the requirement is met, simultaneously supplying power to all paths except the path with the lowest power supply priority and the path with the next lowest power supply priority; otherwise, taking the step (4);
(4) And (4) sequentially checking the lowest power supply priority to the highest power supply priority according to the ideas of (2) and (3), and supplying power to the output corresponding to the satisfied target power allowance.
If each path of output in the off-grid output port is not provided with the power supply priority, the following steps are adopted for processing:
(5) Calculating whether the ratio of the photovoltaic power generation power value to the average output total power meets a target power margin value (300%, 250%, 200% and the like can be set), and executing corresponding operations according to the result:
(6) If the ratio of the photovoltaic power generation power value to the average output total power is larger than or equal to the target power margin value, all paths of all off-grid ports supply power simultaneously; otherwise, taking step (7);
(7) And according to the current photovoltaic power generation power value, selecting the number of output circuits which can meet the target power allowance according to the average output power of each circuit from small to large, and supplying power to the circuits while not supplying power to other circuits.
In conclusion, the off-grid output port can be accurately controlled through the steps, and the power supply dynamic characteristic of the photovoltaic micro-grid under the working condition is optimized.
It should be noted that, when the optical storage power generation system is connected to the energy storage battery, the specific steps of controlling the on/off of the target path output of the off-grid output port according to the target power margin value and the power supply priority are the same as those of the optical storage power generation system not connected to the energy storage battery, and are not described herein again.
When the optical storage power generation system is not connected with an energy storage battery, after the on-off of the target path output of the off-grid output port is controlled according to the target power margin value and the power supply priority, because the photovoltaic power generation power of the optical storage power generation system can change greatly according to the current environmental condition, when one path of load power supply is cut off, the power generation power is tested and tested periodically, once the power generation power can meet the requirement of the power margin of an output path which needs to be increased, each path of output in a non-power supply state can be converted into a power supply state in time, and the method specifically comprises the following steps: if at least one path of output is in a non-power supply state, periodically performing heuristic operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system; and if the power supply priority is set for each path of output in the off-grid output port, controlling the on-off of each path of output in the non-power supply state according to the power supply priority and the target power allowance value.
The periodic heuristic operation of the photovoltaic power generation power of the optical storage power generation system comprises the following steps: judging whether an inverter of the light storage power generation system is in a power limiting mode or not; if the inverter is in the power limiting mode, periodically performing heuristic operation on the photovoltaic power generation power of the light storage power generation system according to a first heuristic period; and if the inverter is not in the limited power mode, periodically probing the photovoltaic power generation power of the light storage power generation system according to a second probing period, wherein the second probing period is smaller than the first probing period.
Specifically, if there is at least 1 output without power supply, it is checked whether the inverter is in a power limited mode before detecting a power down fault of the grid: if the previous inverter state is in a power-limited mode, which represents that the previous photovoltaic power generation power is not maximized, the photovoltaic power generation power probing operation can be immediately carried out, namely the first probing period;
if the previous inverter state is in the non-limited power mode, which represents that the previous photovoltaic power generation is the maximum power at that time, the photovoltaic power generation heuristic operation can be performed according to a set photovoltaic power generation heuristic cycle T2 (which can be 1min, 5min, 10min, etc.), that is, the above-mentioned periodic heuristic operation is performed on the photovoltaic power generation power of the photovoltaic power storage system according to the second heuristic cycle.
The photovoltaic power generation power of the optical storage power generation system is periodically subjected to probing operation, and the increasable photovoltaic power generation power value of the optical storage power generation system can be accurately obtained. According to the increasable photovoltaic power generation power, respectively operating according to whether the power supply priority is set:
if the power supply priority is set: according to the power supply priority from high to low, the increasable photovoltaic power generation power is compared with the average output power of the output paths which are not powered, if the increased photovoltaic power generation power meets the target power margin value, the corresponding paths are powered, otherwise, the power is not powered;
if the power supply priority is not set: and sequentially comparing the increasable photovoltaic power generation power with the average output power of the output paths which are not powered according to the average output power from small to large, if the average output power meets the target power margin value, powering the corresponding paths, and otherwise, not powering.
In summary, by periodically probing the photovoltaic power generation power of the optical storage power generation system, the output circuit load which is not powered can be powered in time, and the normal operation of the load is ensured.
In order to accurately obtain the increasable photovoltaic power generation power value of the optical storage power generation system, the periodical heuristic operation is carried out on the photovoltaic power generation power of the optical storage power generation system so as to obtain the increasable photovoltaic power generation power value of the optical storage power generation system, and the method comprises the following steps: collecting a direct-current bus voltage value of the light storage power generation system to obtain a first voltage value; performing boosting operation on the voltage of the direct current bus according to preset boosting test time to obtain a second voltage value; and calculating the increasable photovoltaic power generation power value of the light storage power generation system according to the first voltage value and the second voltage value.
Specifically, if at least 1 path of output is not supplied with power, the photovoltaic power generation power of the optical storage power generation system is subjected to periodic test operation, the current direct current bus voltage value Vbus1 (namely a first voltage value) is recorded, the optical storage power generation system is instructed to carry out boosting operation on the direct current bus voltage according to the boosting test time Ttest, and the boosting test time Tte is recordedThe bus voltage value Vbus3 (i.e. the second voltage value) after st can be calculated according to the following formula, where C is the bus capacitance value:
Figure 66204DEST_PATH_IMAGE001
. In conclusion, the increasable photovoltaic power generation power value of the optical storage power generation system can be accurately obtained through the steps.
If each path of output in the off-grid output port is provided with a power supply priority, after the on-off of each path of output in a non-power supply state is controlled according to the power supply priority and a target power margin value, the method further comprises the following steps: if the voltage of the direct-current bus of the optical storage power generation system is detected to be reduced and the reduction duration exceeds a preset time period, repeatedly executing the step of controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority if the power supply priority is set for each path of output in the off-grid output port.
Specifically, when the inverter bus voltage is reduced and the maintaining time exceeds T3 (which may be 10s, 20s, 30s, 1min, etc.), indicating that the optical storage power generation system has generated a relatively long time of reduced power generation rather than a transient fluctuation, it may be necessary to perform a load shedding operation. And calculating the ratio of the current photovoltaic power generation power value to the average output power value of the output paths which are supplied with power, if the ratio still meets the target power margin value, not operating, otherwise, controlling the on-off of each path of output in a power supply state according to whether the power supply priority is set by the system.
When the optical storage power generation system is connected with the energy storage battery, after the on-off of the target path output of the off-grid output port is controlled according to the target power margin value and the power supply priority, because the photovoltaic power generation power of the optical storage power generation system can change greatly according to the current environmental condition, when one path of load power supply is cut off, the power generation power is tested and tested periodically, once the power generation power can meet the requirement of the power margin of the output path which needs to be increased, each path of output in the non-power supply state can be converted into the power supply state in time, and the method specifically comprises the following steps:
if at least one path of output average output power is smaller than the rated power value and is in a non-power supply state, and the state of charge value of the energy storage battery is smaller than or equal to a third preset value, periodically performing heuristic operation on the photovoltaic power generation power of the optical storage power generation system to obtain the increasable photovoltaic power generation power value of the optical storage power generation system; and if the power supply priority is set for each path of output in the off-grid output port, controlling the on-off of each path of output in the non-power supply state according to the power supply priority, the charge state value of the energy storage battery and the target power allowance value.
Specifically, a controller of the optical storage power generation system can detect a battery capacity SOC value in real time, and if the SOC value is larger than 10%, the on-off of the target path output of the off-grid output port is controlled according to the target power margin value and the power supply priority; when the SOC < =10%, the battery can be considered to be discharged completely, the load is completely supplied with power by photovoltaic power generation, at least 1 path of output paths meeting the rated power of the inverter outputs no power, and the photovoltaic power generation power probing operation is carried out according to a set photovoltaic power generation power probing cycle (which can be 1min, 5min, 10min and the like);
photovoltaic power generation power probing operation: the system controller records a current direct current bus voltage value Vbus1, performs boosting operation on the direct current bus voltage according to boosting test time Ttest, records a bus voltage value Vbus3 after the boosting test time Ttest, and can calculate the increasable photovoltaic power generation power of the system according to the following formula, wherein C is a bus capacitance value:
Figure 311241DEST_PATH_IMAGE001
. According to the obtained photovoltaic power generation power which can be increased by the system, the operation is respectively carried out according to whether the system has the power supply priority:
the system has set power supply priority: sequentially comparing the increasable photovoltaic power generation power with the output paths which are not supplied with power according to the power supply priority from high to low, if the increased photovoltaic power generation power meets the target power margin value, supplying power to the paths, otherwise, not supplying power; and synchronously detecting the SOC value of the battery capacity, and if the SOC is more than 10%, continuously controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority.
The system does not set power supply priority: sequentially comparing the increasable photovoltaic power generation power with the output path which is not powered according to the average output power value from small to large, if the increased photovoltaic power generation power meets the target power margin value, powering the path, otherwise, not powering; and synchronously detecting the SOC value of the battery capacity, and if the SOC is more than 10%, continuously controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority.
According to the control method of the off-grid output port based on the optical storage power generation system, if the optical storage power generation system detects power failure of a power grid, whether the optical storage power generation system is connected with an energy storage battery is determined; if the light storage power generation system is connected with the energy storage battery, determining that the target power margin value is one of the following values according to the state of charge value of the energy storage battery: a first power margin value, a second power margin value, a third power margin value, a fourth power margin value, wherein the fourth power margin value is greater than the third power margin value, the third power margin value is greater than the second power margin value, and the second power margin value is greater than the first power margin value; if the optical storage power generation system is not connected with the energy storage battery, determining that the target power margin value is a fifth power margin value, wherein the fifth power margin value is greater than or equal to a fourth power margin value; if each path of output in the off-grid output port is provided with a power supply priority, the on-off of the target path output of the off-grid output port is controlled according to the target power margin value and the power supply priority, wherein if the optical storage power generation system is connected with the energy storage battery, the target path output at least comprises one path of output in the off-grid output port, and if the optical storage power generation system is not connected with the energy storage battery, the target path output comprises each path of output in the off-grid output port, so that the problem that the accuracy of on-off control of the off-grid output port is low due to the fact that the on-off of the off-grid output port in the optical storage power generation system is controlled through an additional auxiliary device in the related art is solved. According to the scheme, after the optical storage power generation system detects that the power grid is powered down, the on-off of each output is controlled through the power supply priority and the target power allowance value of each output in the off-grid output port, the off-grid power supply characteristic is optimized, and the effect of improving the accuracy of on-off control of the off-grid output port is achieved.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
The embodiment of the present application further provides a control device for an off-grid output port based on an optical storage power generation system, and it should be noted that the control device for an off-grid output port based on an optical storage power generation system according to the embodiment of the present application may be used to execute the control method for an off-grid output port based on an optical storage power generation system according to the embodiment of the present application. The control device based on the off-grid output port of the optical storage power generation system provided by the embodiment of the application is introduced below.
Fig. 5 is a schematic diagram of a control device based on an off-grid output port of an optical storage power generation system according to an embodiment of the present application. As shown in fig. 5, the apparatus includes: a first determination unit 501, a second determination unit 502, a third determination unit 503, and a first control unit 504.
The first determining unit 501 is configured to determine whether the optical storage power generation system is connected to an energy storage battery if the optical storage power generation system detects a power failure of a power grid;
a second determining unit 502, configured to determine, according to the state of charge value of the energy storage battery, that the target power margin value is one of the following values if the optical storage power generation system is connected to the energy storage battery: a first power margin value, a second power margin value, a third power margin value, a fourth power margin value, wherein the fourth power margin value is greater than the third power margin value, the third power margin value is greater than the second power margin value, and the second power margin value is greater than the first power margin value;
a third determining unit 503, configured to determine that the target power margin value is a fifth power margin value if the optical storage power generation system is not connected to the energy storage battery, where the fifth power margin value is greater than or equal to the fourth power margin value;
a first control unit 504, configured to control, if a power supply priority is set for each output in the off-grid output port, on/off of a target output of the off-grid output port according to the target power margin value and the power supply priority, where the target output at least includes one output in the off-grid output port if the optical storage power generation system is connected to the energy storage battery, and the target output includes each output in the off-grid output port if the optical storage power generation system is not connected to the energy storage battery.
According to the control device of the off-grid output port based on the optical storage power generation system, if the optical storage power generation system detects power failure of a power grid, the first determining unit 501 determines whether the optical storage power generation system is connected with an energy storage battery; if the optical storage power generation system is connected to the energy storage battery, the second determining unit 502 determines that the target power margin value is one of the following values according to the state of charge value of the energy storage battery: a first power margin value, a second power margin value, a third power margin value, a fourth power margin value, wherein the fourth power margin value is greater than the third power margin value, the third power margin value is greater than the second power margin value, and the second power margin value is greater than the first power margin value; if the optical storage power generation system is not connected with the energy storage battery, the third determining unit 503 determines that the target power margin value is a fifth power margin value, where the fifth power margin value is greater than or equal to the fourth power margin value; if each output in the off-grid output port is provided with a power supply priority, the first control unit 504 controls the on-off of the target output of the off-grid output port according to the target power margin value and the power supply priority, wherein if the optical storage power generation system is connected with the energy storage battery, the target output at least comprises one output in the off-grid output port, and if the optical storage power generation system is not connected with the energy storage battery, the target output comprises each output in the off-grid output port, so that the problem that the accuracy of the on-off control of the off-grid output port in the optical storage power generation system is low due to the fact that the on-off of the off-grid output port is controlled through an additional auxiliary device in the related art is solved. According to the scheme, after the optical storage power generation system detects the power failure of the power grid, the on-off of each output is controlled through the power supply priority of each output in the off-grid output port and the target power margin value, the off-grid power supply characteristic is optimized, and the effect of improving the accuracy of on-off control of the off-grid output port is achieved.
Optionally, in the control device based on the off-grid output port of the optical storage power generation system provided in the embodiment of the present application, the device further includes: the fourth determining unit is used for determining that the target power margin value is one of the following values according to the state of charge value of the energy storage battery if the optical storage power generation system is connected with the energy storage battery: before the first power margin value, the second power margin value, the third power margin value and the fourth power margin value, determining a rated power value of an inverter of the optical storage power generation system, and detecting output power of each path of output in an off-grid output port to obtain average output power of each path of output; the calculating unit is used for calculating the sum of the average output power of each path of output to obtain the average output total power; the judging unit is used for judging whether each path of output in the off-grid output port is provided with a power supply priority or not if the average output total power is larger than the rated power value; and the second control unit is used for carrying out on-off control on each path of output in the off-grid output port according to the power supply priority if each path of output in the off-grid output port is provided with the power supply priority, so that the average total output power is smaller than or equal to the rated power value.
Optionally, in the control device based on the off-grid output port of the optical storage power generation system provided in the embodiment of the present application, the device further includes: and the third control unit is used for performing on-off control on each output in the off-grid output port according to the average output power of each output after judging whether each output in the off-grid output port is provided with the power supply priority or not and if each output in the off-grid output port is not provided with the power supply priority, so that the average output total power is smaller than or equal to the rated power value.
Optionally, in the control apparatus based on an off-grid output port of an optical storage and power generation system provided in the embodiment of the present application, the fourth determining unit includes: the detection module is used for detecting the output current output by each path in the off-grid output port and calculating the output power output by each path according to the output current; and the processing module is used for performing sliding average processing on the output power output by each path according to a preset statistical period to obtain the average output power output by each path.
Optionally, in the control device based on the off-grid output port of the optical storage power generation system provided in the embodiment of the present application, the second determining unit includes: the first determining module is used for determining that the target power margin value is a first power margin value if the state of charge value is larger than a first preset value; the second determination module is used for determining that the target power margin value is a second power margin value if the state of charge value is smaller than or equal to a first preset value and the state of charge value is larger than or equal to a second preset value; the third determining module is used for determining that the target power margin value is a third power margin value if the state of charge value is smaller than a second preset value and the state of charge value is larger than a third preset value; and the fourth determining module is used for determining that the target power margin value is the fourth power margin value if the state of charge value is less than or equal to the third preset value.
Optionally, in the control device based on the off-grid output port of the optical storage power generation system provided in the embodiment of the present application, when the optical storage power generation system is not connected to the energy storage battery, the first control unit 504 includes: the acquisition module is used for acquiring the average output total power of the off-grid output port and the photovoltaic power generation power value of the optical storage power generation system; the first calculation module is used for calculating according to the average output total power and the photovoltaic power generation power value to obtain a first actual power margin value; and the control module is used for controlling the on-off of each path of output of the off-grid output port according to the power supply priority if the first actual power allowance value is smaller than the target power allowance value, so that the first actual power allowance value is smaller than or equal to the target power allowance value.
Optionally, in the control device based on an off-grid output port of a light storage and power generation system provided in the embodiment of the present application, the device further includes: the acquisition unit is used for acquiring the output power of each path of output in the off-grid output port if the power supply priority is not set in each path of output in the off-grid output port; and the fourth control unit is used for controlling the on-off of each path of output in the off-grid output port according to the average output power of each path of output, so that the average output total power is less than or equal to the photovoltaic power generation power value.
Optionally, in the control device based on the off-grid output port of the optical storage power generation system provided in the embodiment of the present application, the device further includes: the first operation unit is used for carrying out periodic trial operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system if at least one path of output is in a non-power supply state after the optical storage power generation system is not connected with an energy storage battery and the on-off of the target path of output of the off-grid output port is controlled according to the target power margin value and the power supply priority; and the fifth control unit is used for controlling the on-off of each output in a non-power supply state according to the power supply priority and the target power margin value if the power supply priority is set for each output in the off-grid output port.
Optionally, in the control device based on an off-grid output port of an optical storage power generation system provided in the embodiment of the present application, the operation unit includes: the judging module is used for judging whether an inverter of the light storage power generation system is in a power limiting mode or not; the first operation module is used for carrying out periodic trial operation on the photovoltaic power generation power of the light storage power generation system according to a first trial period if the inverter is in the power limiting mode; and the second operation module is used for periodically probing the photovoltaic power generation power of the light storage power generation system according to a second probing period if the inverter is not in the power limiting mode, wherein the second probing period is smaller than the first probing period.
Optionally, in the control device based on the off-grid output port of the optical storage power generation system provided in the embodiment of the present application, the line voltage value obtains a first voltage value; the third operation module is used for performing boosting operation on the voltage of the direct current bus according to preset boosting test time to obtain a second voltage value; and the second calculation module is used for calculating the increasable photovoltaic power generation power value of the light storage power generation system according to the first voltage value and the second voltage value.
Optionally, in the control device based on the off-grid output port of the optical storage power generation system provided in the embodiment of the present application, the device further includes: and the sixth control unit is used for repeatedly executing the power supply priority setting on each output in the off-grid output port and controlling the on-off of the target output in the off-grid output port according to the target power margin value and the target power margin value if the fact that the voltage of the direct current bus of the optical storage power generation system is reduced and the reduced duration exceeds a preset time period is detected after the fact that the power supply priority setting on each output in the off-grid output port is set and the on-off of the target output in the off-grid output port is controlled according to the target power margin value and the power supply priority.
Optionally, in the control device based on the off-grid output port of the optical storage power generation system provided in the embodiment of the present application, the device further includes: the second operation unit is used for carrying out periodic trial operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system if at least one path of output average output power is smaller than a rated power value and is in a non-power supply state and the charge state value of the energy storage battery is smaller than or equal to a third preset value after the optical storage power generation system is connected with the energy storage battery and the target path output of the off-grid output port is controlled according to a target power margin value and a power supply priority; and the seventh control unit is used for controlling the on-off of each path of output in a non-power supply state according to the power supply priority, the charge state value of the energy storage battery and the target power allowance value if each path of output in the off-grid output port is provided with the power supply priority.
The control device based on the off-grid output port of the optical storage power generation system comprises a processor and a memory, wherein the first determining unit 501, the second determining unit 502, the third determining unit 503, the first control unit 504 and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can be set to be one or more than one, and the off-grid output port of the optical storage power generation system can be accurately controlled by adjusting kernel parameters.
The memory may include volatile memory in a computer readable medium, random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
The embodiment of the invention provides a processor, which is used for running a program, wherein the program runs to execute a control method based on an off-grid output port of a light storage power generation system.
As shown in fig. 6, an embodiment of the present invention provides an electronic device, where the device includes a processor, a memory, and a program stored in the memory and executable on the processor, and the processor executes the program to implement the following steps: if the optical storage power generation system detects power failure of a power grid, determining whether the optical storage power generation system is connected with an energy storage battery; if the light storage power generation system is connected with the energy storage battery, determining that the target power margin value is one of the following values according to the state of charge value of the energy storage battery: a first power margin value, a second power margin value, a third power margin value, a fourth power margin value, wherein the fourth power margin value is greater than the third power margin value, the third power margin value is greater than the second power margin value, and the second power margin value is greater than the first power margin value; if the optical storage power generation system is not connected with the energy storage battery, determining that the target power margin value is a fifth power margin value, wherein the fifth power margin value is greater than or equal to a fourth power margin value; and if each path of output in the off-grid output port is provided with a power supply priority, controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority, wherein if the optical storage power generation system is connected with the energy storage battery, the target path output at least comprises one path of output in the off-grid output port, and if the optical storage power generation system is not connected with the energy storage battery, the target path output comprises each path of output in the off-grid output port.
Optionally, if the optical storage power generation system is connected to the energy storage battery, the target power margin value is determined to be one of the following values according to the state of charge value of the energy storage battery: before the first, second, third, and fourth power headroom values, the method further comprises: determining a rated power value of an inverter of the optical storage power generation system, and detecting output power output by each path in an off-grid output port to obtain average output power output by each path; calculating the sum of the average output power of each path of output to obtain the average total output power; if the average output total power is larger than the rated power value, judging whether each path of output in the off-grid output port is provided with a power supply priority or not; and if the power supply priority is set for each path of output in the off-grid output port, on-off control is carried out on each path of output in the off-grid output port according to the power supply priority, so that the average total output power is smaller than or equal to the rated power value.
Optionally, after determining whether each output in the off-grid output port sets the power supply priority, the method further includes: and if the power supply priority is not set for each path of output in the off-grid output port, performing on-off control on each path of output in the off-grid output port according to the average output power of each path of output, so that the average output total power is smaller than or equal to the rated power value.
Optionally, detecting an output power of each output in the off-grid output port, and obtaining an average output power of each output includes: detecting output current output by each path in the off-grid output port, and calculating to obtain output power output by each path according to the output current; and carrying out moving average processing on the output power output by each path according to a preset statistical period to obtain the average output power output by each path.
Optionally, according to the state of charge value of the energy storage battery, determining the target power margin value as one of the following: the first, second, third and fourth power headroom values comprise: if the SOC value is larger than a first preset value, determining that the target power margin value is a first power margin value; if the state of charge value is smaller than or equal to a first preset value and the state of charge value is larger than or equal to a second preset value, determining that the target power margin value is a second power margin value; if the SOC value is smaller than a second preset value and the SOC value is larger than a third preset value, determining that the target power margin value is a third power margin value; and if the state of charge value is less than or equal to a third preset value, determining that the target power margin value is a fourth power margin value.
Optionally, when the optical storage power generation system is not connected to the energy storage battery, if a power supply priority is set for each output in the off-grid output port, controlling on/off of a target output of the off-grid output port according to the target power margin value and the power supply priority includes: acquiring the average output total power of an off-grid output port and the photovoltaic power generation power value of the optical storage power generation system; calculating according to the average output total power and the photovoltaic power generation power value to obtain a first actual power margin value; and if the first actual power margin value is smaller than the target power margin value, controlling the on-off of each path of output of the off-grid output port according to the power supply priority so as to enable the first actual power margin value to be smaller than or equal to the target power margin value.
Optionally, if each output in the off-grid output port is not set with a power supply priority, the method further includes: acquiring output power of each path of output in an off-grid output port; and performing on-off control on each output in the off-grid output port according to the average output power of each output, so that the average total output power is smaller than or equal to the photovoltaic power generation power value.
Optionally, when the optical storage power generation system is not connected to the energy storage battery, after controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority, the method further includes: if at least one path of output is in a non-power supply state, periodically performing heuristic operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system; and if the power supply priority is set for each path of output in the off-grid output port, controlling the on-off of each path of output in the non-power supply state according to the power supply priority and the target power allowance value.
Optionally, the periodically performing heuristic operation on the photovoltaic power generation power of the optical storage power generation system comprises: judging whether an inverter of the light storage power generation system is in a power limiting mode or not; if the inverter is in a power limiting mode, periodically probing the photovoltaic power generation power of the light storage power generation system according to a first probing period; and if the inverter is not in the limited power mode, periodically performing heuristic operation on the photovoltaic power generation power of the light storage power generation system according to a second heuristic period, wherein the second heuristic period is smaller than the first heuristic period.
Optionally, the periodically performing a heuristic operation on the photovoltaic power generation power of the optical storage power generation system to obtain the increasable photovoltaic power generation power value of the optical storage power generation system includes: collecting a direct-current bus voltage value of the light storage power generation system to obtain a first voltage value; performing boosting operation on the voltage of the direct current bus according to preset boosting test time to obtain a second voltage value; and calculating the increasable photovoltaic power generation power value of the light storage power generation system according to the first voltage value and the second voltage value.
Optionally, after controlling on/off of each output in a non-power-supply state according to the power supply priority and the target power margin value if the power supply priority is set for each output in the off-grid output port, the method further includes: if the voltage of the direct current bus of the optical storage power generation system is detected to be reduced and the reduced duration time exceeds a preset time period, repeatedly executing the operation that if the power supply priority is set for each path of output in the off-grid output port, the on-off of the target path of output of the off-grid output port is controlled according to the target power margin value and the power supply priority.
Optionally, when the optical storage power generation system is connected to the energy storage battery, after the on-off of the target path output of the off-grid output port is controlled according to the target power margin value and the power supply priority, the method further includes: if the average output power of at least one path of output is smaller than the rated power value and is in a non-power supply state, and the state of charge value of the energy storage battery is smaller than or equal to a third preset value, periodically performing trial operation on the photovoltaic power generation power of the optical storage power generation system to obtain the increasable photovoltaic power generation power value of the optical storage power generation system; and if the power supply priority is set for each path of output in the off-grid output port, controlling the on-off of each path of output in the non-power supply state according to the power supply priority, the charge state value of the energy storage battery and the target power allowance value.
The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: if the optical storage power generation system detects power failure of a power grid, determining whether the optical storage power generation system is connected with an energy storage battery; if the light storage power generation system is connected with the energy storage battery, determining that the target power margin value is one of the following values according to the state of charge value of the energy storage battery: a first power margin value, a second power margin value, a third power margin value, a fourth power margin value, wherein the fourth power margin value is greater than the third power margin value, the third power margin value is greater than the second power margin value, and the second power margin value is greater than the first power margin value; if the optical storage power generation system is not connected with the energy storage battery, determining that the target power margin value is a fifth power margin value, wherein the fifth power margin value is greater than or equal to a fourth power margin value; and if each path of output in the off-grid output port is provided with a power supply priority, controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority, wherein if the optical storage power generation system is connected with the energy storage battery, the target path output at least comprises one path of output in the off-grid output port, and if the optical storage power generation system is not connected with the energy storage battery, the target path output comprises each path of output in the off-grid output port.
Optionally, if the optical storage power generation system is connected to the energy storage battery, the target power margin value is determined to be one of the following values according to the state of charge value of the energy storage battery: before the first, second, third, and fourth power headroom values, the method further comprises: determining a rated power value of an inverter of the optical storage power generation system, and detecting output power output by each path in an off-grid output port to obtain average output power output by each path; calculating the sum of the average output power of each path of output to obtain the average total output power; if the average output total power is larger than the rated power value, judging whether each path of output in the off-grid output port is provided with a power supply priority or not; and if the power supply priority is set for each path of output in the off-grid output port, on-off control is carried out on each path of output in the off-grid output port according to the power supply priority, so that the average total output power is smaller than or equal to the rated power value.
Optionally, after determining whether each output in the off-grid output port sets the power supply priority, the method further includes: and if the power supply priority is not set for each path of output in the off-grid output port, performing on-off control on each path of output in the off-grid output port according to the average output power of each path of output, so that the average output total power is smaller than or equal to the rated power value.
Optionally, detecting the output power of each output in the off-grid output port, and obtaining the average output power of each output includes: detecting output current output by each path in the off-grid output port, and calculating to obtain output power output by each path according to the output current; and carrying out sliding average processing on the output power output by each path according to a preset statistical period to obtain the average output power output by each path.
Optionally, according to the state of charge value of the energy storage battery, determining the target power margin value as one of the following: the first, second, third and fourth power headroom values include: if the SOC value is larger than a first preset value, determining that the target power margin value is a first power margin value; if the state of charge value is smaller than or equal to a first preset value and the state of charge value is larger than or equal to a second preset value, determining that the target power margin value is a second power margin value; if the SOC value is smaller than a second preset value and the SOC value is larger than a third preset value, determining that the target power margin value is a third power margin value; and if the state of charge value is less than or equal to a third preset value, determining that the target power margin value is a fourth power margin value.
Optionally, when the optical storage power generation system is not connected to the energy storage battery, if a power supply priority is set for each output in the off-grid output port, controlling on/off of a target output of the off-grid output port according to the target power margin value and the power supply priority includes: acquiring the average output total power of an off-grid output port and the photovoltaic power generation power value of the optical storage power generation system; calculating according to the average output total power and the photovoltaic power generation power value to obtain a first actual power margin value; and if the first actual power margin value is smaller than the target power margin value, controlling the on-off of each path of output of the off-grid output port according to the power supply priority so as to enable the first actual power margin value to be smaller than or equal to the target power margin value.
Optionally, if each output in the off-grid output port is not set with a power supply priority, the method further includes: acquiring output power of each path of output in an off-grid output port; and performing on-off control on each output in the off-grid output port according to the average output power of each output, so that the average total output power is smaller than or equal to the photovoltaic power generation power value.
Optionally, when the optical storage power generation system is not connected to the energy storage battery, after controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority, the method further includes: if at least one path of output is in a non-power supply state, periodically performing heuristic operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system; and if the power supply priority is set for each path of output in the off-grid output port, controlling the on-off of each path of output in the non-power supply state according to the power supply priority and the target power allowance value.
Optionally, the periodically probing the photovoltaic power generation power of the optical storage power generation system comprises: judging whether an inverter of the light storage power generation system is in a power limiting mode or not; if the inverter is in a power limiting mode, periodically probing the photovoltaic power generation power of the light storage power generation system according to a first probing period; and if the inverter is not in the limited power mode, periodically probing the photovoltaic power generation power of the light storage power generation system according to a second probing period, wherein the second probing period is smaller than the first probing period.
Optionally, the periodically performing a heuristic operation on the photovoltaic power generation power of the optical storage power generation system to obtain the increasable photovoltaic power generation power value of the optical storage power generation system includes: collecting a direct-current bus voltage value of the light storage power generation system to obtain a first voltage value; performing boosting operation on the voltage of the direct current bus according to preset boosting test time to obtain a second voltage value; and calculating the increasable photovoltaic power generation power value of the light storage power generation system according to the first voltage value and the second voltage value.
Optionally, after controlling the on/off of each output in the non-power-supply state according to the power supply priority and the target power margin value if the power supply priority is set for each output in the off-grid output port, the method further includes: if the voltage of the direct current bus of the optical storage power generation system is detected to be reduced and the reduced duration time exceeds a preset time period, repeatedly executing the operation that if the power supply priority is set for each path of output in the off-grid output port, the on-off of the target path of output of the off-grid output port is controlled according to the target power margin value and the power supply priority.
Optionally, when the optical storage power generation system is connected to the energy storage battery, after the on-off of the target path output of the off-grid output port is controlled according to the target power margin value and the power supply priority, the method further includes: if the average output power of at least one path of output is smaller than the rated power value and is in a non-power supply state, and the state of charge value of the energy storage battery is smaller than or equal to a third preset value, periodically performing trial operation on the photovoltaic power generation power of the optical storage power generation system to obtain the increasable photovoltaic power generation power value of the optical storage power generation system; and if the power supply priority is set for each path of output in the off-grid output port, controlling the on-off of each path of output in the non-power supply state according to the power supply priority, the charge state value of the energy storage battery and the target power allowance value.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (15)

1. A control method for an off-grid output port based on an optical storage power generation system is characterized in that the control method is applied to the optical storage power generation system, each phase of the off-grid output port of the optical storage power generation system at least comprises two paths of outputs, and the method comprises the following steps:
if the optical storage power generation system detects power failure of a power grid, determining whether the optical storage power generation system is connected with an energy storage battery;
if the light storage power generation system is connected with the energy storage battery, determining that the target power margin value is one of the following values according to the state of charge value of the energy storage battery: a first power margin value, a second power margin value, a third power margin value, a fourth power margin value, wherein the fourth power margin value is greater than the third power margin value, the third power margin value is greater than the second power margin value, and the second power margin value is greater than the first power margin value;
if the optical storage power generation system is not connected with the energy storage battery, determining that the target power margin value is a fifth power margin value, wherein the fifth power margin value is greater than or equal to the fourth power margin value;
if each path of output in the off-grid output port is provided with a power supply priority, controlling the on-off of the target path output of the off-grid output port according to the target power margin value and the power supply priority, wherein if the optical storage power generation system is connected with the energy storage battery, the target path output at least comprises one path of output in the off-grid output port, and if the optical storage power generation system is not connected with the energy storage battery, the target path output comprises each path of output in the off-grid output port.
2. The method according to claim 1, wherein if the optical storage power generation system is connected to the energy storage battery, determining a target power margin value as one of the following according to the state of charge value of the energy storage battery: before the first, second, third, and fourth power headroom values, the method further comprises:
determining a rated power value of an inverter of the optical storage power generation system, and detecting output power output by each path in the off-grid output port to obtain average output power output by each path;
calculating the sum of the average output power of each path of output to obtain the average total output power;
if the average output total power is larger than the rated power value, judging whether each path of output in the off-grid output port is provided with a power supply priority;
and if each path of output in the off-grid output port is provided with a power supply priority, performing on-off control on each path of output in the off-grid output port according to the power supply priority so as to enable the average total output power to be less than or equal to the rated power value.
3. The method of claim 2, wherein after determining whether each of the off-grid output ports has a power-on priority set, the method further comprises:
and if the power supply priority is not set for each path of output in the off-grid output port, performing on-off control on each path of output in the off-grid output port according to the average output power of each path of output, so that the average output total power is less than or equal to the rated power value.
4. The method of claim 2, wherein detecting an output power of each output in the off-grid output port, and wherein obtaining an average output power of each output comprises:
detecting output current output by each path in the off-grid output port, and calculating to obtain output power output by each path according to the output current;
and performing sliding average processing on the output power output by each path according to a preset statistical period to obtain the average output power output by each path.
5. The method of claim 1, wherein the target power margin value is determined to be one of the following according to the state of charge value of the energy storage battery: the first, second, third and fourth power headroom values comprise:
if the SOC value is larger than a first preset value, determining that the target power margin value is the first power margin value;
if the state of charge value is smaller than or equal to the first preset value and the state of charge value is larger than or equal to a second preset value, determining that the target power margin value is the second power margin value;
if the state of charge value is smaller than the second preset value and the state of charge value is larger than a third preset value, determining that the target power margin value is the third power margin value;
and if the state of charge value is smaller than or equal to the third preset value, determining that the target power margin value is the fourth power margin value.
6. The method of claim 1, wherein when the optical storage power generation system is not connected to the energy storage battery, if a power supply priority is set for each output in the off-grid output port, controlling on/off of a target output of the off-grid output port according to the target power margin value and the power supply priority comprises:
acquiring the average output total power of the off-grid output port and the photovoltaic power generation power value of the optical storage power generation system;
calculating according to the average output total power and the photovoltaic power generation power value to obtain a first actual power margin value;
and if the first actual power margin value is larger than the target power margin value, controlling the on-off of each output of the off-grid output port according to the power supply priority so as to enable the first actual power margin value to be smaller than or equal to the target power margin value.
7. The method of claim 6, wherein if each of the off-grid output ports has no power priority set, the method further comprises:
acquiring output power of each path of output in the off-grid output port;
and performing on-off control on each path of output in the off-grid output port according to the average output power of each path of output, so that the average output total power is smaller than or equal to the photovoltaic power generation power value.
8. The method of claim 1, wherein after controlling the off-grid output of the off-grid output port to be turned on or off according to the target power margin value and the power supply priority when the optical storage power generation system is not connected to the energy storage battery, the method further comprises:
if at least one path of output is in a non-power supply state, periodically performing trial operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system;
and if the power supply priority is set for each output in the off-grid output port, controlling the on-off of each output in a non-power supply state according to the power supply priority and the target power margin value.
9. The method of claim 8, wherein periodically probing the photovoltaic power generation power of the light storage power generation system comprises:
judging whether an inverter of the light storage power generation system is in a power limiting mode or not;
if the inverter is in a power limiting mode, periodically probing the photovoltaic power generation power of the light storage power generation system according to a first probing period;
and if the inverter is not in the limited power mode, periodically probing the photovoltaic power generation power of the light storage power generation system according to a second probing period, wherein the second probing period is smaller than the first probing period.
10. The method of claim 8, wherein periodically performing a heuristic operation on the photovoltaic power generation power of the optical storage power generation system to obtain the increasable photovoltaic power generation power value of the optical storage power generation system comprises:
collecting a direct-current bus voltage value of the light storage power generation system to obtain a first voltage value;
performing boosting operation on the voltage of the direct current bus according to preset boosting test time to obtain a second voltage value;
and calculating the increasable photovoltaic power generation power value of the light storage power generation system according to the first voltage value and the second voltage value.
11. The method of claim 8, wherein after controlling the switching of each output in a non-powered state according to the power supply priority and the target power margin value if a power supply priority is set for each output in the off-grid output port, the method further comprises:
if the voltage of the direct current bus of the optical storage power generation system is detected to be reduced and the duration of the reduction exceeds a preset time period, repeatedly executing the operation that if the power supply priority is set for each path of output in the off-grid output port, the on-off of the target path of output of the off-grid output port is controlled according to the target power margin value and the power supply priority.
12. The method of claim 2, wherein after controlling the off-grid output of the off-grid output port to be on or off according to the target power margin value and the power supply priority when the optical storage power generation system is connected to the energy storage battery, the method further comprises:
if at least one path of output average output power is smaller than the rated power value and is in a non-power supply state, and the state of charge value of the energy storage battery is smaller than or equal to a third preset value, periodically performing heuristic operation on the photovoltaic power generation power of the optical storage power generation system to obtain an increasable photovoltaic power generation power value of the optical storage power generation system;
and if each path of output in the off-grid output port is provided with a power supply priority, controlling the on-off of each path of output in a non-power supply state according to the power supply priority, the charge state value of the energy storage battery and the target power allowance value.
13. A control device of an off-grid output port based on a light storage power generation system is characterized by comprising:
the first determination unit is used for determining whether the optical storage power generation system is connected with an energy storage battery or not if the optical storage power generation system detects power failure of a power grid;
the second determining unit is configured to determine, according to the state of charge value of the energy storage battery, that the target power margin value is one of the following values if the optical storage power generation system is connected to the energy storage battery: a first power margin value, a second power margin value, a third power margin value, a fourth power margin value, wherein the fourth power margin value is greater than the third power margin value, the third power margin value is greater than the second power margin value, and the second power margin value is greater than the first power margin value;
a third determining unit, configured to determine that the target power margin value is a fifth power margin value if the optical storage power generation system is not connected to the energy storage battery, where the fifth power margin value is greater than or equal to the fourth power margin value;
the first control unit is configured to control on/off of a target path output of the off-grid output port according to the target power margin value and the power supply priority if a power supply priority is set for each path of output in the off-grid output port, where the target path output at least includes one path of output in the off-grid output port if the optical storage power generation system is connected to the energy storage battery, and the target path output includes each path of output in the off-grid output port if the optical storage power generation system is not connected to the energy storage battery.
14. A processor, characterized in that the processor is configured to run a program, wherein the program is executed to execute the method for controlling the off-grid output port of the optical storage and power generation system according to any one of claims 1 to 12.
15. An electronic device, comprising one or more processors and memory for storing one or more programs, wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of controlling an off-grid output port based on a light storage and power generation system of any one of claims 1 to 12.
CN202211595973.5A 2022-12-13 2022-12-13 Off-grid output port control method and device based on optical storage power generation system Active CN115603375B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211595973.5A CN115603375B (en) 2022-12-13 2022-12-13 Off-grid output port control method and device based on optical storage power generation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211595973.5A CN115603375B (en) 2022-12-13 2022-12-13 Off-grid output port control method and device based on optical storage power generation system

Publications (2)

Publication Number Publication Date
CN115603375A CN115603375A (en) 2023-01-13
CN115603375B true CN115603375B (en) 2023-04-07

Family

ID=84854091

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211595973.5A Active CN115603375B (en) 2022-12-13 2022-12-13 Off-grid output port control method and device based on optical storage power generation system

Country Status (1)

Country Link
CN (1) CN115603375B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103647274A (en) * 2013-11-26 2014-03-19 中国西电电气股份有限公司 Micro-grid system being capable of grid-connected and off-grid operation, and energy control method
CN109672213A (en) * 2017-10-17 2019-04-23 丰郅(上海)新能源科技有限公司 Power optimized system and its optimization method containing double optimization
CN112952910A (en) * 2021-04-23 2021-06-11 西安领充创享新能源科技有限公司 Optical storage off-network system control method, device, controller and storage medium
WO2022199585A1 (en) * 2021-03-25 2022-09-29 华为数字能源技术有限公司 Photovoltaic power generation system, power control device, and energy storage system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103647274A (en) * 2013-11-26 2014-03-19 中国西电电气股份有限公司 Micro-grid system being capable of grid-connected and off-grid operation, and energy control method
CN109672213A (en) * 2017-10-17 2019-04-23 丰郅(上海)新能源科技有限公司 Power optimized system and its optimization method containing double optimization
WO2022199585A1 (en) * 2021-03-25 2022-09-29 华为数字能源技术有限公司 Photovoltaic power generation system, power control device, and energy storage system
CN112952910A (en) * 2021-04-23 2021-06-11 西安领充创享新能源科技有限公司 Optical storage off-network system control method, device, controller and storage medium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
孙玉鸿 等.一种可与市电并联的分布式发电储能离网逆变器控制方法及应用.《电气技术》.2017,(第12期),第157-162页. *

Also Published As

Publication number Publication date
CN115603375A (en) 2023-01-13

Similar Documents

Publication Publication Date Title
US9705360B2 (en) Redundant uninterruptible power supply systems
US7402965B2 (en) DC common bus self-protection method and system
CN109698507B (en) Phase modulator and static var compensator coordinated control method and system
CN105305532B (en) System and method for managing backfeed in an uninterruptible power supply system
CN104917277B (en) Redundant uninterruptible power supply system
US12027859B2 (en) Methods and systems for power management in a microgrid
JPWO2018043222A1 (en) Management device and storage system
CN110867881A (en) Energy storage control method and system for optical storage and charging system
CN104716734A (en) Energy storage system (ess) using uninterruptible power supply(ups)
CN111157831B (en) Performance test method, device and equipment for power-on buffer resistor
CN114156971A (en) Energy storage charging and discharging control method, device and equipment and energy storage system
CN115603375B (en) Off-grid output port control method and device based on optical storage power generation system
CN111654034B (en) Park level voltage sag layered and graded treatment system and method and terminal equipment
CN113629654A (en) Power supply control method, circuit, device and readable storage medium
CN115603351B (en) Energy storage system processing method and device, processor and electronic equipment
CN110581642B (en) Converter soft start circuit and method
CN103344870B (en) The thyristor method for detecting short circuit of uninterruptible power system and device
CN112039060B (en) Control method and device applied to power supply circuit, terminal and storage medium
CN115663979A (en) Voltage balancing method of battery pack, battery energy storage and power supply system and electronic device
US10381966B2 (en) PN-busbar common system, regenerative control device, and regenerative control method
CN114301051A (en) Control method and device of direct current power supply system and control equipment
CN117134638B (en) Upgrade method, inverter, parallel operation system and readable storage medium
CN115833251B (en) Energy storage inverter centralized management method and device and energy storage inverter system
CN114236203B (en) Load control system, method, storage medium and electronic device
CN115940381A (en) Power supply switching method and device, nonvolatile storage medium and electronic equipment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CP03 Change of name, title or address

Address after: 325024 No. 939, Jinhai Third Road, Konggang new area, Longwan District, Wenzhou City, Zhejiang Province

Patentee after: Foxess Co.,Ltd.

Address before: 325025 No. 939, Jinhai 3rd Road, Airport New Area, Longwan District, Wenzhou City, Zhejiang Province

Patentee before: Maitian Energy Co.,Ltd.

CP03 Change of name, title or address