CN113890101A - Energy storage transformation system and control method thereof - Google Patents
Energy storage transformation system and control method thereof Download PDFInfo
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- CN113890101A CN113890101A CN202111276840.7A CN202111276840A CN113890101A CN 113890101 A CN113890101 A CN 113890101A CN 202111276840 A CN202111276840 A CN 202111276840A CN 113890101 A CN113890101 A CN 113890101A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 255
- 230000009466 transformation Effects 0.000 title claims abstract description 81
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- 238000010248 power generation Methods 0.000 claims abstract description 137
- 230000002159 abnormal effect Effects 0.000 claims abstract description 23
- 238000004891 communication Methods 0.000 claims description 12
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- 230000005856 abnormality Effects 0.000 claims description 7
- 238000005868 electrolysis reaction Methods 0.000 claims description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 10
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
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- 238000007796 conventional method Methods 0.000 description 2
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- 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
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- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- 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
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- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- 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
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- 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
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- 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
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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Abstract
The application provides an energy storage transformation system and a control method thereof, wherein after an energy storage converter in the energy storage transformation system detects that a power grid is abnormal, whether an input parameter of an off-grid side of the energy storage transformation system is larger than an absorbable parameter is judged; if so, controlling the power generation control equipment arranged on the off-grid side of the energy storage converter to reduce the power, controlling the power generation control equipment to stop grid connection, and judging whether the input parameters on the off-grid side meet preset switching conditions in real time; when the result is satisfied, controlling the self to switch into an off-grid running state, and outputting a first preset off-grid voltage frequency; because stopping being incorporated into the power networks is not equal to the operation of leaving the net, the power generation control equipment triggers the overfrequency protection after detecting first preset voltage frequency of leaving the net, therefore energy storage converter can be according to the relation between the side input parameter of leaving the net and the absorbable parameter when the electric wire netting is unusual, determine the action chronogenesis of self quick and leaving the net switching, can enough satisfy the quick power supply of leaving the net under the circumstances of requirement, solved energy storage bus overvoltage problem again.
Description
Technical Field
The invention relates to the technical field of control, in particular to an energy storage transformation system and a control method thereof.
Background
At present, in an energy storage transformation system, taking an energy storage transformation system in which a photovoltaic inverter and an energy storage converter operate in parallel as an example, the wiring mode is generally as shown in fig. 1: and the alternating current output side of the photovoltaic inverter is connected with the off-grid side of the energy storage converter.
When the power grid is abnormal, the photovoltaic inverter can utilize the off-grid voltage of the energy storage converter to realize power generation operation; when the load is light and the illumination is sufficient, the photovoltaic inverter can charge the battery of the energy storage converter; when the load is heavier, the photovoltaic inverter and the energy storage converter can supply power to the load together, so that the energy utilization rate of the energy storage transformation system is improved.
However, when the grid side of the energy storage transformation system is abnormal in the grid-connected operation process and needs to be switched to off-grid operation, if a battery in the energy storage transformation system is in a full-charge state or no battery is connected, the energy storage converter cannot absorb the power of the photovoltaic inverter, and bus overvoltage can occur.
Disclosure of Invention
Therefore, the energy storage transformation system and the control method thereof are provided to solve the problem that when the grid side of the existing energy storage transformation system is abnormal in the grid-connected operation process and needs to be switched to off-grid operation, the energy storage converter cannot absorb the power of the photovoltaic inverter because the battery in the energy storage transformation system is in a full-charge state or has no battery access, so that the bus overvoltage is caused.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the invention discloses a control method of an energy storage reconstruction system in a first aspect, which comprises the following steps:
after an energy storage converter in the energy storage transformation system detects that a power grid is abnormal, judging whether an off-grid side input parameter of the energy storage converter is larger than an absorbable parameter;
if the judgment result is yes, controlling the off-grid side power generation control equipment arranged on the off-grid side of the energy storage converter to reduce power, stopping grid connection, and judging whether the off-grid side input parameters meet preset switching conditions in real time;
if the judgment result is satisfied, controlling the self to switch into an off-grid running state and outputting a first preset off-grid voltage frequency; and the power generation control equipment triggers over-frequency protection after detecting the first preset off-grid voltage frequency.
Optionally, in the control method of the energy storage transformation system, after determining whether an off-grid-side input parameter of the control method is greater than an absorbable parameter, if the determination result is negative, the method further includes:
controlling the self to switch to the off-grid running state, and outputting a second preset off-grid voltage frequency; and the power generation control equipment does not trigger over-frequency protection after detecting the second preset off-grid voltage frequency.
Optionally, in the control method of the energy storage reconstruction system, if the energy storage converter is in communication connection with the power generation control device, after the energy storage converter in the energy storage reconstruction system detects that an abnormality occurs in a power grid, the method further includes:
and respectively controlling the power generation control equipment to stop and self-switch into an off-grid running state.
Optionally, in the control method of the energy storage reconstruction system, after the energy storage converter in the energy storage reconstruction system detects that the power grid is abnormal, the method further includes:
judging whether the output parameter of the off-grid side of the self is greater than zero;
if the judgment result is yes, controlling the self to switch to the off-grid running state, and outputting a second preset off-grid voltage frequency; and the power generation control equipment does not trigger over-frequency protection after detecting the second preset off-grid voltage frequency.
Optionally, in the control method of the energy storage reconstruction system, after determining whether the output parameter of the off-grid side of the control method is greater than zero, if the determination result is negative, the step of determining whether the input parameter of the off-grid side of the control method is greater than the absorbable parameter is performed.
Optionally, in the control method of the energy storage reconstruction system, the step of enabling the off-grid side input parameter to meet the preset switching condition includes: and the off-network side input parameters fall into the numerical range corresponding to the preset switching condition.
Optionally, in the control method of the energy storage modification system, an upper limit value of the numerical range is a preset value, and a lower limit value of the numerical range is zero.
The second aspect of the present invention discloses an energy storage reconstruction system, including: the system comprises an energy storage converter, a grid-connected switch, an energy storage battery and a new energy power generation unit; wherein:
the energy storage side of the energy storage converter is connected with the energy storage battery, and the off-grid side of the energy storage converter is provided with a load;
the grid-connected side of the energy storage converter is connected with a power grid through the grid-connected switch;
the off-grid side of the energy storage converter is connected with the output side of the new energy power generation unit, so as to realize the control method of the energy storage transformation system disclosed by any one of the first aspect.
Optionally, in the energy storage transformation system, the power generation control device in the new energy power generation unit is further connected to the energy storage converter in a communication manner.
Optionally, in the energy storage modification system, the method further includes: and the second power generation unit is connected with the energy storage converter.
Optionally, in the above energy storage modification system, the second power generation unit includes: photovoltaic module, aerogenerator and hydrogen electrolysis trough.
Optionally, in the energy storage transformation system, if the new energy power generation unit is a photovoltaic power generation unit, the power generation control device is a photovoltaic inverter;
or if the new energy power generation unit is a wind power generation unit, the power generation control equipment is a wind power converter;
or, if the new energy power generation unit is a hydrogen energy power generation unit, the power generation control device is a hydrogen-electricity converter.
The invention provides a control method of an energy storage transformation system, which is characterized in that after an energy storage variable flow in the energy storage transformation system detects that a power grid is abnormal, whether an input parameter of an off-grid side of the method is larger than an absorbable parameter is judged; if the judgment result is yes, controlling the power generation control equipment arranged on the off-grid side of the energy storage converter to reduce power, stopping grid connection, and judging whether the input parameters on the off-grid side meet the preset switching conditions in real time; if the judgment result is satisfied, controlling the self to switch into an off-grid running state and outputting a first preset off-grid voltage frequency; the power generation control equipment triggers over-frequency protection after detecting a first preset off-grid voltage frequency; that is, the method that this application provided can be according to the electric wire netting when unusual, the relation between the side input parameter of leaving the net of energy storage converter and the absorbable parameter, determine the action time sequence that the energy storage converter was fast and switched over from the net, when guaranteeing to leave the side input parameter less than or equal to absorbable parameter in the energy storage transformation system, all can leave the net fast and give emergency load power supply, the problem of bus overvoltage that has resulted in because of the energy storage converter can't absorb photovoltaic inverter's power because of the battery is in full charge state or no battery inserts in the energy storage transformation system when the net side takes place unusually in the operation process of being incorporated into the power networks of current energy storage transformation system has been solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an existing energy storage transformation system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an energy storage transformation system according to an embodiment of the present disclosure;
fig. 3 to 7 are flowcharts of control methods of five energy storage transformation systems according to embodiments of the present application;
fig. 8 to 13 are schematic structural diagrams of another six energy storage transformation systems provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides a control method of an energy storage transformation system, and aims to solve the problem that when an existing energy storage transformation system is switched to off-grid operation when a grid side is abnormal in a grid-connected operation process, an energy storage converter cannot absorb power of a photovoltaic inverter because a battery in the energy storage transformation system is in a full-charge state or has no battery access, so that bus overvoltage is caused.
With reference to fig. 2 and 3, the control method of the energy storage modification system may include the following steps:
s100, after an energy storage converter in the energy storage transformation system detects that the power grid is abnormal, judging whether the input parameters of the off-grid side of the energy storage converter are larger than the absorbable parameters.
The abnormal condition of the power grid can be referred to in the prior art, and can include but not limited to abnormal voltage of the power grid and abnormal disturbance of the power grid.
Specifically, the method for detecting the power grid abnormality by the energy storage converter can be referred to in the prior art, and is not described in detail in the application, and the method belongs to the protection scope of the application.
It should be noted that, if the energy storage converter does not detect that the power grid is abnormal, the energy storage converter can continue to control normal grid-connected operation.
And the off-grid side input parameters refer to power, current or voltage input to the off-grid side of the energy storage converter. Specifically, the off-grid side input parameters of the energy storage converter may be: the difference between the output of the power generation control device located on the off-grid side of the energy storage converter and the off-grid side load (load in fig. 2) located on the energy storage converter. The absorbable parameters can represent the current power storage capacity of the energy storage battery connected with the energy storage converter.
In practical application, the parameters of the off-grid side input parameters and the parameters of the absorbable parameters can be the same or different; all of which belong to the protection scope of the present application, depending on the specific application environment.
In other words, the off-grid input parameter and the absorbable parameter may be one or more of power, current, or voltage, and may be the same or different.
Assuming that the off-grid side input parameter of the energy storage converter is power, the off-grid side input power of the energy storage converter can be determined according to the difference value between the output power of the power generation control equipment and the off-grid side load power of the energy storage converter. Similarly, if the off-grid side input parameter is current or voltage, the off-grid side input current or voltage of the energy storage converter can be determined according to the corresponding output current or power of the power generation control equipment and the corresponding off-grid side load current or power of the energy storage converter, and the specific application condition can be determined according to the specific environment.
If the off-grid side input parameter of the energy storage converter is assumed to be power, the off-grid side voltage and current signals of the energy storage converter can be collected through an off-grid side voltage sampling circuit and an off-grid side current sampling circuit of the energy storage converter, and then the off-grid side input power is calculated; of course, the method of obtaining the off-grid side input power is not limited to the above, and reference may also be made to the prior art, which is not described herein again, and all of which belong to the protection scope of the present application.
It should also be noted that the off-grid side load power of the energy storage converter may be the off-grid side load power of the energy storage converter, that is, the power of the load shown in fig. 2.
If the determination result is yes, that is, if the off-grid side input parameter of the self is determined to be greater than the absorbable parameter, step S102 is executed.
S102, controlling the self-stopping grid connection and judging whether the input parameters of the off-grid side meet preset switching conditions in real time with the aim of controlling the power reduction of the power generation control equipment arranged on the off-grid side of the energy storage converter.
In practical application, if the grid-side input parameter of the energy storage converter in the energy storage transformation system is greater than the absorbable parameter, it can be stated that the electric energy output by the power generation control device in the energy storage transformation system is greater than the absorption capacity of the battery in the energy storage transformation system, and the residual electric energy in the energy storage transformation system needs to be released through the power grid. However, due to the fact that the power grid is abnormal, redundant energy cannot be released from the internet, the power generation control equipment can flow power back to the energy storage converter, and the risk of overvoltage of a bus of the energy storage converter can be caused.
Under the condition, the energy storage converter can stop grid connection, so that the energy storage converter cannot establish off-grid side voltage, and the off-grid side voltage of the energy storage converter is reduced. After detecting that the voltage of the off-grid side is reduced, the power generation control equipment can be triggered to enter an output under-voltage protection state so as to reduce the power and even stop running, so that the purpose of controlling the power generation control equipment arranged on the off-grid side of the energy storage converter to reduce the power is achieved.
It should be noted that, after the energy storage converter stops grid connection, the voltage on the off-grid side decreases, and the power generation control device stops outputting after determining that the power grid is abnormal.
In practical application, the off-network side input parameter meeting the preset switching condition may be: and the off-network side input parameters fall into the numerical range corresponding to the preset switching condition. The upper limit of the range may be a preset value, and the lower limit may be zero.
Specifically, the value of the preset value may be close to zero, and may also be determined according to a specific application environment and a user requirement, which is not specifically limited in the present application and all belong to the scope of the present application.
It should be noted that when the energy storage converter is controlled to be in a grid-connected stop state, whether the own off-grid-side input parameter meets the preset switching condition or not can be judged in real time, and if the judgment result is that the own off-grid-side input parameter meets the preset switching condition, the step S104 is executed.
And S104, controlling the self switching-in off-grid running state and outputting a first preset off-grid voltage frequency.
And the stop grid connection of the energy storage converter is not equal to the cut-in off-grid operation state. And after detecting the first preset off-grid voltage frequency, the power generation control equipment triggers over-frequency protection.
It should be noted that the first preset off-grid voltage frequency is a frequency that can trigger the power generation control device to enter the over-frequency protection state. The specific value of the first preset off-grid voltage frequency can be calculated according to an over-frequency load reduction curve of the power generation control equipment, and can also be determined according to specific application environment and user requirements.
In practical application, the power generation control equipment is arranged on the off-grid side of the energy storage converter, and the output port of the power generation control equipment is connected with the off-grid side of the energy storage converter. Therefore, the power generation control equipment can decide whether to control the power generation control equipment to enter the over-frequency protection state or not by detecting the off-grid voltage frequency.
It can be understood that, when the output power of the power generation control device is close to zero, or after the power generation control device is stopped to zero, the off-grid side power of the energy storage converter is close to 0, the energy storage converter is controlled to switch into the off-grid operation state, and meanwhile, the energy storage converter is controlled to output at a first preset off-grid voltage frequency, and the power generation control device is triggered to operate in the over-frequency protection state. When the power generation control equipment is a photovoltaic inverter, the first preset off-grid voltage can be obtained by calculation according to an over-frequency load reduction curve of the photovoltaic inverter.
Based on the above, assuming that the power generation control device in the energy storage transformation system is the photovoltaic inverter, it can be understood that the output power of the off-grid side of the energy storage converter in the energy storage transformation system is negative, that is, the photovoltaic inverter has the remaining power to flow to the power grid, but the absorbable power of the energy storage converter is smaller than the negative power of the off-grid side, when the power grid is abnormal, the energy storage converter stops grid connection first, the energy storage converter cannot establish the voltage of the off-grid side at this time, and the voltage of the off-grid side can be reduced. And after the photovoltaic inverter detects that the voltage on the off-grid side is reduced, the power can be reduced, and even the photovoltaic inverter is stopped. And then, when the energy storage converter detects that the power of the off-grid port is close to 0, switching to off-grid operation, wherein the frequency of the off-grid voltage output after switching is the frequency which can enable the photovoltaic inverter to enter an over-frequency protection state, namely the photovoltaic inverter can be controlled to stop outputting in a frequency shift and load reduction mode, so that the control of the energy storage transformation system is realized.
In the control method of the energy storage transformation system provided by the embodiment, according to the abnormal condition of the power grid, the relation between the off-grid side input parameters and the absorbable parameters of the energy storage converter in the energy storage transformation system determines the action time sequence of the energy storage converter for fast off-grid switching, ensures that when the off-grid side input parameters in the energy storage transformation system are less than or equal to the absorbable parameters, i.e. the load power is larger than the output power of the power generation control equipment or the absorbable power of the energy storage converter, can quickly leave the grid to supply power to an emergency load, solves the problem that the existing energy storage transformation system is switched to off-grid operation when the grid side is abnormal in the grid-connected operation process, because of the battery is in the full charge state or no battery is connected in the energy storage transformation system, the energy storage converter can not absorb the power of the photovoltaic inverter, the problem of bus overvoltage is caused, and the user experience of the energy storage transformation system in practical application is improved.
It is worth to be noted that there is still a backflow prevention method for an optical storage system in the prior art, but the application scenario of the method is the optical storage system, while the application scenario of the method provided by the present application is an energy storage reconstruction system, and the two systems have different system topologies. In addition, the light storage in the existing scheme is direct current coupling, and the photovoltaic inverter and the energy storage converter are not communicated, so that the control cannot be realized; the energy storage transformation system is in alternating current coupling, the photovoltaic inverter and the energy storage converter can be controlled to stop grid connection to reduce the power output by the photovoltaic inverter under the condition that communication connection is not needed, and then the energy storage converter is controlled to switch into an off-grid running state and output a first preset off-grid voltage frequency after the fact that the off-grid side input parameters meet preset switching conditions is judged in real time, so that the power generation control equipment triggers an over-frequency protection mode to realize control under a non-communication state after detecting the first preset off-grid voltage frequency. In addition, the PV power needs to be adjusted through the photovoltaic inverter in the existing scheme, and the grid-connected stopping state of the energy storage converter is increased, so that the voltage of the off-grid side of the energy storage converter is reduced, and the photovoltaic inverter is forced to stop and reduce the power.
It is worth to be noted that, in most of the existing application scenarios, the photovoltaic inverter and the energy storage converter cannot be in communication connection, and when the energy storage transformation system is in off-grid operation and the energy storage converter cannot absorb the redundant power of the photovoltaic inverter, the photovoltaic inverter is forced to derate and output or even stop operating in an active frequency modulation manner. And when the grid side of the energy storage system is abnormal in the grid-connected operation process, the energy storage system needs to be switched to off-grid operation. When an energy storage battery in an energy storage system is fully charged or no battery is accessed, an energy storage converter cannot absorb the power of a photovoltaic inverter, the conventional method generally comprises the steps of directly stopping the energy storage system, and then starting up again at an over-frequency to ensure that the power of the photovoltaic inverter cannot be reversely poured into the energy storage converter to cause system abnormality; according to the method and the device, the purpose of controlling the power reduction of the power generation control equipment can be firstly achieved, the energy storage converter is controlled to stop grid connection, then the energy storage converter is controlled to be switched into an off-grid running state and run in a first preset off-grid voltage frequency mode under the condition that the off-grid side input parameters meet the preset switching conditions, the abnormity caused by the fact that the power of the photovoltaic inverter flows back to the energy storage converter is avoided, the energy storage converter does not need to be controlled to be shut down firstly and then started, and the user experience of the energy storage transformation system in practical application is further improved.
Optionally, in another embodiment provided by the present application, after determining whether the off-grid-side input parameter of the control method is greater than the absorbable parameter in step S100, if the determination result is negative, that is, it is determined that the off-grid-side input parameter of the control method is not greater than the absorbable parameter, referring to fig. 4, the control method of the energy storage transformation system further includes:
and S200, controlling the self to switch to an off-grid running state, and outputting a second preset off-grid voltage frequency.
And after detecting a second preset off-grid voltage frequency, the power generation control equipment does not trigger over-frequency protection.
It should be noted that the second preset off-grid voltage frequency is a frequency that enables the power generation control device to normally operate, that is, a frequency that can not trigger the power generation control device to enter an over-frequency protection state or an under-frequency protection state. The specific value of the second preset off-grid voltage frequency can be calculated according to an over-frequency load reduction curve of the power generation control equipment, and can also be determined according to a specific application environment and user requirements.
In practical application, the power generation control equipment is arranged on the off-grid side of the energy storage converter, and the output port of the power generation control equipment is connected with the off-grid side of the energy storage converter. Therefore, the power generation control equipment can adjust the running state of the power generation control equipment according to the self characteristics of the equipment and the detected off-grid voltage frequency, and control of the energy storage converter and the power generation control equipment in a non-communication state is realized.
It should be noted that, if the grid side input parameter of the energy storage converter is not greater than the absorbable parameter, it can be stated that the electric energy output by the power generation control device in the energy storage transformation system is not greater than the absorption capacity of the battery in the energy storage transformation system, and the residual electric energy existing in the energy storage transformation system can be released without passing through the power grid and is directly absorbed by the battery in the energy storage transformation system, and although the power grid is abnormal at this moment, the risk that the power generation control device can flow backward to the energy storage converter and cause the overvoltage of the bus of the energy storage converter can be avoided.
Under the condition, the energy storage converter can be directly subjected to fast grid-connected and off-grid switching, and second preset off-grid voltage frequency is output, so that the power generation control equipment does not trigger over-frequency protection after detecting the second preset off-grid voltage frequency, and can operate in a normal state.
Optionally, in another embodiment provided in the present application, referring to fig. 5, if the energy storage converter is in communication connection with the power generation control device, after the energy storage converter in the energy storage transformation system detects that an abnormality occurs in the power grid, the control method further includes:
and S400, respectively controlling the power generation control equipment to stop and self to switch into an off-grid running state.
The mode of controlling the power generation control equipment to stop is determined according to specific application environment and user requirements, and the application is not particularly limited and belongs to the protection scope of the application.
Assuming that the power generation control device is a photovoltaic inverter, the manner of controlling the power generation control device to stop may be: and sending a power-reducing instruction to the photovoltaic inverter, reducing the output power of the photovoltaic inverter, and stopping the photovoltaic inverter normally after the output power is gradually reduced to zero. Of course, the photovoltaic inverter can be controlled to stop in other existing manners, and the manner of stopping the photovoltaic inverter is not particularly limited in this application, and all of the manners belong to the protection scope of the application.
In this embodiment, when energy storage converter and power generation control equipment communication connection in the energy storage transformation system, can be through the mode of communication, direct control power generation control equipment stops and control energy storage converter switches to off-grid running state, not only solved current energy storage transformation system and taken place unusually at the net side of the operation process that is incorporated into the power networks, switch to off-grid operation, because of the battery is in full charge state or no battery inserts in the energy storage transformation system, energy storage converter can't absorb photovoltaic inverter's power, the problem of the generating line overvoltage that leads to has still simplified control flow.
Optionally, in another embodiment provided by the present application, after an energy storage converter in an energy storage transformation system detects that an abnormality occurs in a power grid, referring to fig. 6, the method for controlling the energy storage transformation system further includes:
s300, judging whether the output parameter of the off-grid side of the self is larger than zero.
In practical application, the off-grid side output parameters of the energy storage converter represent the power, current or voltage output through the off-grid side of the energy storage converter.
When the output parameter of the off-grid side of the energy storage converter is larger than zero, the output of the power generation control equipment in the energy storage transformation system is smaller than the load, and the load needs to take power from the power grid or the energy storage transformation system.
If the determination result is yes, that is, if the output parameter of the off-network side of the user is determined to be greater than zero, step S302 is executed. If the determination result is negative, that is, the output parameter of the off-grid side of the self is not greater than zero, a step of determining whether the input parameter of the off-grid side of the self is greater than the absorbable parameter, that is, step S100, may be performed.
It should be noted that, when it is determined that the output parameter of the off-grid side of the energy storage converter is not greater than zero, it is determined that the output of the power generation control device in the energy storage transformation system is greater than the load, and the load does not need to get power from the power grid or the energy storage transformation system, and in order to determine whether the energy storage converter can be directly controlled to switch into the off-grid operation state and output the first preset voltage frequency, it is required to first determine whether the input parameter of the off-grid side of the energy storage converter is greater than the absorbable parameter, that is, to perform step S100.
S302, controlling the self-switching to the off-grid operation state, and outputting a second preset off-grid voltage frequency.
And after detecting a second preset off-grid voltage frequency, the power generation control equipment does not trigger over-frequency protection.
It should be noted that, for the relevant description of step S302, refer to step S200, which is not described herein again, and all belong to the protection scope of the present application.
In practical application, if the output parameter of the off-grid side of the energy storage converter is greater than zero, it is indicated that the output of the power generation control device in the energy storage transformation system is less than the load power, and the load operation needs to additionally take power from the energy storage converter or the power grid. In other words, at this time, the off-grid side load power of the energy storage converter in the energy storage transformation system is greater than the output power of the parallel power generation control device, if the power grid is abnormal, the energy storage converter can directly execute fast off-grid switching, and output a second preset off-grid voltage frequency, so that the power generation control device is in a normal operation state.
In combination with the above, in practical application, the magnitude relation between the output of the power generation control device and the load in the energy storage transformation system can be determined through the positive and negative of the off-grid side input parameter, if the direction from the load to the off-grid side is defined as positive and the direction from the off-grid side to the load is defined as negative, the off-grid side input parameter is negative, which means that the output of the power generation control device is smaller than the load, and the load needs to take power from the power grid or the energy storage transformation system; and the input parameter of the off-grid side is positive, which indicates that the output of the power generation control equipment is greater than the load, and the power generation control equipment outputs redundant energy to flow to the energy storage converter.
If the positive or negative of the off-network input parameter is used as the determination condition, the corresponding flow diagram can be as shown in fig. 7.
It should be noted that, in addition to the above-described specific embodiments, the magnitude relationship between the output of the power generation control device and the load may be determined by other conventional methods, and any method is within the scope of the present application.
In combination with the control method of the energy storage reformation system, another embodiment of the present application further provides an energy storage reformation system, also referring to fig. 2, where the energy storage reformation system may include: the system comprises an energy storage converter 100, a grid-connected switch K, an energy storage battery 102 and a new energy power generation unit 101. Wherein:
the energy storage side of the energy storage converter 100 is connected with the energy storage battery 102, and the off-grid side of the energy storage converter 100 is provided with a load.
In practical applications, the energy storage converter 100 may absorb power through the energy storage battery 102, or release electric energy from the energy storage battery 102. The load arranged on the off-grid side of the energy storage converter 100 can be supplied with power through the energy storage battery 102, and can also be supplied with power through a power grid when the energy storage transformation system is in grid-connected operation; of course, the new energy power generation unit 101 in the energy storage transformation system may also supply power, which depends on the specific application environment, and both belong to the protection scope of the present application.
The grid-connected side of the energy storage converter 100 is connected to the grid through a grid-connected switch K.
In practical application, the grid-connected switch K may be a relay, may be other control switches, and is determined according to a specific application environment, and both belong to the protection scope of the present application.
It should be noted that whether the energy storage transformation system is connected to the grid or not can be achieved through on-off control of the grid-connected switch K.
The off-grid side of the energy storage converter 100 is connected to the output side of the new energy power generation unit 101, so as to implement the control method of the energy storage transformation system according to any of the embodiments.
It should be noted that, as shown in fig. 8, the output side of the new energy power generation unit 101 may also be connected to the grid-connected side of the energy storage converter 100. Wherein. When the grid-connected switch K is in the off state, the new energy power generation unit 101 is also in the off-grid state.
As shown in fig. 2 or 8, the new energy power generation unit 101 generally includes a power generation control device 1011 and a first power generation unit 1012. The first power generation unit 1012 is mainly used to generate electric power and output the generated electric power to the power generation control device 1011. The power generation control device 1011 is mainly used to control whether or not to output the electric power generated by the first power generation unit 1012.
In practical application, if the new energy power generation unit 101 is a photovoltaic power generation unit, the power generation control device 1011 is a photovoltaic inverter, that is, the situation shown in fig. 9; if the new energy power generation unit 101 is a wind power generation unit, the power generation control device 1011 is a wind power converter, that is, the situation shown in fig. 10; if the new energy power generation unit 101 is a hydrogen energy power generation unit, the power generation control device 1011 is a hydrogen power converter, that is, the case shown in fig. 11.
Correspondingly, referring to fig. 9, if the power generation control device 1011 is a photovoltaic inverter, the first power generation unit 1012 is a photovoltaic module; referring to fig. 10, if the power generation control device 1011 is a wind power converter, the first power generation unit 1012 is a wind power generator; referring to fig. 11, if the power generation control device 101 is a hydrogen power converter, the first power generation unit 1012 is a hydrogen electrolyzer.
Optionally, as also shown in fig. 2 or fig. 8, in practical applications, the energy storage modification system further includes a second power generation unit 103, and the second power generation unit 103 is connected to the energy storage converter 100.
Wherein the second power generation unit 103 may be a photovoltaic module shown in fig. 9; of course, the method is not limited to this, and may be determined according to the specific application environment and the user's requirement, for example, a wind power generator (fig. 10), a hydrogen electrolyzer (fig. 11), and the like.
Optionally, in practical application, with reference to fig. 12 or 13, the power generation control device 1011 in the new energy power generation unit 101 in the energy storage transformation system may also be in communication connection with the energy storage converter 100, and after detecting that an abnormality occurs in the power grid, the power generation control device 1011 in the new energy power generation unit 101 may be directly controlled to stop operating, so as to avoid the problem of overvoltage of the bus of the energy storage converter 100 caused by the fact that the output of the new energy power generation unit 101 flows back to the energy storage converter 100.
It should be noted that, for the related description of the control method of the energy storage transformation system, reference may be made to the method embodiments corresponding to fig. 3 to fig. 7, which are not described herein again, and all of which belong to the protection scope of the present application.
Features described in the embodiments in the present specification may be replaced with or combined with each other, and the same and similar portions among the embodiments may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (12)
1. A control method of an energy storage transformation system is characterized by comprising the following steps:
after an energy storage converter in the energy storage transformation system detects that the power grid is abnormal, judging whether an input parameter of the energy storage converter on the off-grid side is larger than an absorbable parameter;
if the judgment result is yes, controlling the off-grid side power generation control equipment arranged on the off-grid side of the energy storage converter to reduce power, stopping grid connection, and judging whether the off-grid side input parameters meet preset switching conditions in real time;
if the judgment result is satisfied, controlling the self to switch into an off-grid running state and outputting a first preset off-grid voltage frequency; and the power generation control equipment triggers over-frequency protection after detecting the first preset off-grid voltage frequency.
2. The control method of the energy storage transformation system according to claim 1, wherein after determining whether the off-grid side input parameter of the control method is greater than the absorbable parameter, if the determination result is no, the control method further comprises:
controlling the self to switch to the off-grid running state, and outputting a second preset off-grid voltage frequency; and the power generation control equipment does not trigger over-frequency protection after detecting the second preset off-grid voltage frequency.
3. The method according to claim 1, wherein if the energy storage converter is in communication connection with the power generation control device, after detecting that the power grid is abnormal, the method further comprises:
and respectively controlling the power generation control equipment to stop and self-switch into an off-grid running state.
4. The method for controlling the energy storage transformation system according to claim 1, wherein after detecting the abnormality of the power grid, the method further comprises:
judging whether the output parameter of the off-grid side of the self is greater than zero;
if the judgment result is yes, controlling the self to switch to the off-grid running state, and outputting a second preset off-grid voltage frequency; and the power generation control equipment does not trigger over-frequency protection after detecting the second preset off-grid voltage frequency.
5. The control method of the energy storage transformation system according to claim 4, wherein after determining whether the output parameter of the off-grid side of the control method is greater than zero, if the determination result is negative, the step of determining whether the input parameter of the off-grid side of the control method is greater than the absorbable parameter is performed.
6. The control method of the energy storage reformation system according to any one of claims 1 to 5, characterized in that the meeting of the preset switching condition by the off-grid-side input parameter comprises: and the off-network side input parameters fall into the numerical range corresponding to the preset switching condition.
7. The method according to claim 6, wherein the upper limit value of the numerical range is a preset value, and the lower limit value is zero.
8. An energy storage retrofit system, comprising: the system comprises an energy storage converter, a grid-connected switch, an energy storage battery and a new energy power generation unit; wherein:
the energy storage side of the energy storage converter is connected with the energy storage battery, and the off-grid side of the energy storage converter is provided with a load;
the grid-connected side of the energy storage converter is connected with a power grid through the grid-connected switch;
the off-grid side of the energy storage converter is connected with the output side of the new energy power generation unit so as to realize the control method of the energy storage transformation system as claimed in any one of claims 1 to 7.
9. The energy storage transformation system of claim 8, wherein the power generation control device in the new energy power generation unit is further in communication with the energy storage converter.
10. The energy storage retrofit system of claim 9, further comprising: and the second power generation unit is connected with the energy storage converter.
11. The energy storage retrofit system of claim 10, wherein the second power generation unit comprises: photovoltaic module, aerogenerator and hydrogen electrolysis trough.
12. The energy storage transformation system of claim 8, wherein if the new energy power generation unit is a photovoltaic power generation unit, the power generation control device is a photovoltaic inverter;
or if the new energy power generation unit is a wind power generation unit, the power generation control equipment is a wind power converter;
or, if the new energy power generation unit is a hydrogen energy power generation unit, the power generation control device is a hydrogen-electricity converter.
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