CN112952920B - Photovoltaic dispatching system and power dispatching method thereof - Google Patents
Photovoltaic dispatching system and power dispatching method thereof Download PDFInfo
- Publication number
- CN112952920B CN112952920B CN202110406095.7A CN202110406095A CN112952920B CN 112952920 B CN112952920 B CN 112952920B CN 202110406095 A CN202110406095 A CN 202110406095A CN 112952920 B CN112952920 B CN 112952920B
- Authority
- CN
- China
- Prior art keywords
- scheduling
- power
- photovoltaic
- inverter
- voltage
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 78
- 238000004891 communication Methods 0.000 claims description 19
- 238000003491 array Methods 0.000 claims description 8
- 230000035882 stress Effects 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
-
- 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
-
- 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)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
The application provides a photovoltaic dispatching system and a power dispatching method thereof, wherein after receiving a power dispatching instruction, the method determines the direct-current voltage working range of the photovoltaic dispatching system according to the relation between the current power of each inverter in the photovoltaic dispatching system and the PV voltage; judging whether an intersection exists between the direct-current voltage working range and a direct-current high-voltage power limiting interval of the photovoltaic dispatching system; if yes, the output power of at least one target scheduling object in the photovoltaic scheduling system is adjusted to be smaller than a first preset value, so that other target adjusting objects work in a non-direct-current high-voltage power limiting interval, namely, the method and the device enable all target adjusting objects in the photovoltaic system to work in a non-direct-current high-voltage power limiting interval range in the scheduling process through a mode that part of target adjusting object output power is adjusted through a software algorithm, and the problem that external scheduling instructions cannot be responded because all inverters in the photovoltaic system work in a direct-current high-voltage power limiting state in the scheduling process is avoided.
Description
Technical Field
The invention relates to the technical field of control, in particular to a photovoltaic dispatching system and a power dispatching method thereof.
Background
And a photovoltaic group string PV in the photovoltaic system is connected with a power grid after being connected with an inverter, so that grid-connected power generation is realized. Under normal conditions, the inverter will find the maximum power point of each path of PV through the MPPT algorithm and operate at the maximum power. However, in practical applications, the power grid needs to perform power dispatching on the photovoltaic system, and the inverter in the dispatching process is in a power limiting state, so that the PV connected to the inverter cannot work at the maximum power point.
In connection with fig. 1, the voltage at the maximum power point of the PV is V1, and when the inverter to which the PV is connected is actively scheduled, the voltage is shifted to the right of the voltage at the maximum power point, for example, to V2, and the dc voltage of the inverter is raised.
Since the internal devices of the inverter can bear limited electric stress and thermal stress, when the direct current voltage is raised, the internal direct current bus voltage is raised. When the direct-current voltage reaches a certain voltage value, the inverter needs to limit the output power so as to protect the stress of the inverter from exceeding the self bearing range; after the inverter enters the direct-current high-voltage power limiting state, the inverter can not respond to the external dispatching command any more.
Disclosure of Invention
In this regard, the application provides a photovoltaic dispatching system and a power dispatching method thereof, so as to avoid the problem that each inverter in the photovoltaic system works in a direct-current high-voltage power limiting state in the dispatching process, and further, cannot respond to an external dispatching instruction.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
the first aspect of the invention discloses a power scheduling method of a photovoltaic scheduling system, which comprises the following steps:
after receiving a power scheduling instruction, determining a direct-current voltage working range of the photovoltaic scheduling system according to the relation between the current power and the PV voltage of each inverter in the photovoltaic scheduling system;
judging whether an intersection exists between the direct-current voltage working range and the direct-current high-voltage power-limiting interval time of the photovoltaic dispatching system;
and if the intersection exists between the direct-current voltage working range and the direct-current high-voltage power limiting interval, adjusting the output power of at least one target scheduling object in the photovoltaic scheduling system to be smaller than a first preset value so that other target adjusting objects work in a non-direct-current high-voltage power limiting interval.
Optionally, in the power scheduling method of the photovoltaic scheduling system, after receiving the power scheduling instruction, determining the dc voltage working range of the photovoltaic scheduling system according to the relationship between the current power and the PV voltage of each inverter in the photovoltaic scheduling system includes:
determining target power of each inverter according to the power scheduling instruction;
respectively calculating according to the current power of each inverter and the corresponding PV voltage to obtain a target direct current voltage of each inverter under the target power;
and obtaining the working range of the direct current voltage according to each target direct current voltage.
Optionally, in the power scheduling method of the photovoltaic scheduling system, the obtaining the working range of the direct current voltage according to each target direct current voltage includes:
taking the maximum value of all the target direct current voltages as the upper limit of the direct current voltage working range; the method comprises the steps of,
and taking the minimum value of all the target direct current voltages as the lower limit of the current direct current voltage working range.
Optionally, in the power scheduling method of a photovoltaic scheduling system, adjusting output power of at least one target scheduling object in the photovoltaic scheduling system to be smaller than a first preset value so that other target adjustment objects all work in a non-direct current high voltage power limiting interval includes:
adjusting the output power of at least one target scheduling object in the photovoltaic scheduling system to be smaller than a first preset value or zero so that the output power of other target adjusting objects is larger than a second preset value or corresponding maximum power; wherein the first preset value is smaller than the second preset value.
Optionally, in the power scheduling method of the photovoltaic scheduling system, before adjusting the output power of at least one target scheduling object in the photovoltaic scheduling system to be less than a first preset value, the method further includes:
and calculating according to the power scheduling instruction and the direct-current high-voltage power limiting interval to obtain the adjustment quantity of the target scheduling object.
Optionally, in the power scheduling method of the photovoltaic scheduling system, the photovoltaic scheduling system includes: the system comprises a main controller, at least two subarray scheduling controllers and an inverter subarray, wherein the at least two subarray scheduling controllers are in communication connection with the main controller, and the inverter subarrays are formed by at least two inverters which are in communication connection with the corresponding subarray scheduling controllers;
the target adjustment object is the inverter subarray or an inverter.
Optionally, in the power scheduling method of a photovoltaic scheduling system, when the receiving object of the power scheduling instruction is the master controller, the target adjustment object is the inverter sub-array.
Optionally, in the power scheduling method of a photovoltaic scheduling system, when the receiving object of the power scheduling instruction is the subarray scheduling controller, the target adjustment object is an inverter.
Optionally, in the power scheduling method of the photovoltaic scheduling system, after determining whether there is an intersection between the dc voltage working range and a dc high voltage power limit section of the photovoltaic scheduling system, if it is determined that there is no intersection between the dc voltage working range and the dc high voltage power limit section, the method further includes:
and responding to the power scheduling instruction, and controlling each target scheduling object to output with equal power.
Optionally, in the power scheduling method of a photovoltaic scheduling system, the power scheduling instruction includes: active dispatch instructions, and/or reactive dispatch instructions.
The second aspect of the invention discloses a photovoltaic dispatching system, comprising: the system comprises a master controller, at least two sub-array scheduling controllers and an inverter sub-array thereof; wherein:
the inverter sub-array comprises at least two inverters;
the subarray scheduling controller is in communication connection with each inverter in the corresponding inverter subarray;
the master controller is in communication connection with each subarray scheduling controller;
the master controller and/or the sub-array scheduling controller are/is configured to implement the power scheduling method of the photovoltaic scheduling system as disclosed in any one of the first aspect.
Optionally, in the above photovoltaic scheduling system, each of the inverter subarrays is controlled by at least one corresponding subarray scheduling controller.
After receiving a power scheduling instruction, the method determines the direct-current voltage working range of the photovoltaic scheduling system according to the relation between the current power and the PV voltage of each inverter in the photovoltaic scheduling system; then, judging whether an intersection exists between the direct-current voltage working range and a direct-current high-voltage power limiting interval of the photovoltaic dispatching system; if the intersection exists between the direct-current voltage working range and the direct-current high-voltage power limiting interval, adjusting the output power of at least one target scheduling object in the photovoltaic scheduling system to be smaller than a first preset value so that other target adjusting objects work in a non-direct-current high-voltage power limiting interval; that is, according to the power scheduling method of the photovoltaic scheduling system, the output power of part of target adjustment objects can be adjusted through a software algorithm, so that each target adjustment object in the photovoltaic system works in a non-direct-current high-voltage power limiting interval range in the scheduling process, and the problem that an external scheduling instruction cannot be responded because each inverter in the photovoltaic system works in a direct-current high-voltage power limiting state in the scheduling process is solved. In addition, as each inverter in the photovoltaic system works in a non-direct-current high-voltage power limiting interval range in the dispatching process, the problem of exceeding of the stress of the inverter can be avoided, the tolerance amount of internal devices of the inverter is not required to be increased, the photovoltaic system is not required to be improved by adding a shutoff device and other components, the photovoltaic system can be realized only through a software algorithm, and the hardware cost and the system cost of the inverter are saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of PV voltage versus power provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a photovoltaic dispatching system according to an embodiment of the present application;
fig. 3 is a flowchart of a power scheduling method of a photovoltaic scheduling system according to an embodiment of the present application;
fig. 4 is a flowchart for determining a dc voltage operating range of a photovoltaic dispatching system according to an embodiment of the present disclosure;
fig. 5 is a flowchart of another power scheduling method of a photovoltaic scheduling system according to an embodiment of the present application;
fig. 6 is a flowchart of a power scheduling method of another photovoltaic scheduling system according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
An embodiment of the present application provides a photovoltaic dispatching system, please refer to fig. 2, the photovoltaic dispatching system mainly includes: a master controller (AGC/AVC as shown in fig. 2) and at least two sub-array scheduling controllers (log ger as shown in fig. 2) and inverter sub-arrays thereof. Wherein:
at least two inverters (Inverter as shown in FIG. 2) are included in the Inverter sub-array.
In practical application, the specific number of the inverters in each subarray scheduling array in the photovoltaic scheduling system is determined according to specific application environments and user requirements, and the number of the inverters in each subarray scheduling array can be the same or different.
The subarray scheduling controller is in communication with each inverter in the corresponding inverter subarray.
In practical application, communication connection can be realized between the subarray scheduling controller and each inverter in the corresponding inverter subarray through an RS485 mode, a wired network mode or a wireless network mode, and certainly, the method is not limited to this, and communication between the subarray scheduling controller and each inverter in the corresponding inverter subarray can also be realized through other existing communication modes.
The overall controller is in communication with each of the sub-array scheduling controllers.
Similarly, the general controller in practical application can also realize communication connection with each subarray scheduling controller in a mode of RS485, a wired network or a wireless network; of course, the communication connection manner between the master controller and each sub-array scheduling controller is not limited to this, and communication between the master controller and each sub-array scheduling controller can be realized by other existing manners.
In practical application, the specific number of the subarray scheduling controllers in the photovoltaic scheduling system is determined according to specific application environments and user requirements, and the specific number of the subarray scheduling controllers is not limited and belongs to the protection scope of the application.
The master controller and/or the subarray scheduling controller are used for realizing the power scheduling method of the photovoltaic scheduling system provided by the following embodiment.
In order to distinguish the power scheduling method of the photovoltaic scheduling system implemented by the master controller from the subarray scheduling controller, the power scheduling method of the photovoltaic scheduling system executed by the master controller may be regarded as a power station level scheduling method, and the power scheduling method of the photovoltaic scheduling system executed by the subarray scheduling controller may be regarded as a subarray level scheduling method.
In practical application, the power station level scheduling method and the subarray level scheduling method can be implemented by corresponding controllers respectively and independently, or can be implemented in a combined way, and the method and the system are dependent on specific application environments and belong to the protection scope of the application.
In practical application, each inverter sub-array is controlled by at least one corresponding sub-array scheduling controller, and the inverter sub-arrays can also be simultaneously connected with two or more sub-array scheduling controllers in a communication way, so long as at least one sub-array scheduling controller can execute a sub-array level scheduling method.
Based on the photovoltaic dispatching system provided by the above, another embodiment of the present application further provides a power dispatching method of the photovoltaic dispatching system, so as to avoid the problem that each inverter in the photovoltaic system works in a direct-current high-voltage power limiting state in the dispatching process, and further, cannot respond to an external dispatching instruction.
Referring to fig. 3, the power scheduling method of the photovoltaic scheduling system mainly includes the following steps:
s101, after a power dispatching instruction is received, determining a direct-current voltage working range of the photovoltaic dispatching system according to the relation between the current power and the PV voltage of each inverter in the photovoltaic dispatching system.
In practical application, the power dispatching instruction may be a reactive dispatching instruction and/or an active dispatching instruction, which are determined according to specific application environments and user requirements, and all belong to the protection scope of the application.
It should be noted that, according to the relationship between the current power and the PV voltage of each inverter in the photovoltaic dispatching system, a specific manner of determining the dc voltage operating range of the photovoltaic dispatching system may be as shown in fig. 4, and specifically includes the following steps:
s201, determining target power of each inverter according to the power scheduling instruction.
In practical application, the power to be scheduled in the power scheduling instruction can be equally divided to each inverter so as to determine the target power of each inverter.
S202, respectively calculating according to the current power of each inverter and the corresponding PV voltage to obtain the target direct current voltage of each inverter under the target power.
In practical application, after determining the target power of each inverter, the dc voltage of each inverter under the target power can be calculated according to the relationship between the current power of each inverter and the corresponding PV voltage, and the calculated dc voltage is used as the target dc voltage of the inverter under the target power.
S203, obtaining a direct-current voltage working range according to each target direct-current voltage.
In practical applications, the maximum value of all the target dc voltages may be used as the upper limit of the dc voltage operating range, and the minimum value of all the target dc voltages may be used as the lower limit of the current dc voltage operating range.
S102, judging whether an intersection exists between the direct-current voltage working range and a direct-current high-voltage power limiting interval of the photovoltaic dispatching system.
In practical application, the direct-current high-voltage power-limiting interval of the photovoltaic dispatching system refers to a power interval corresponding to each inverter in the photovoltaic dispatching system after entering a direct-current high-voltage power-limiting state. Each inverter in the direct current high voltage power limiting section cannot respond to an external dispatching instruction.
The specific value of the direct-current high-voltage power limiting interval of the photovoltaic dispatching system is required to be determined according to the specific application environment, and the direct-current high-voltage power limiting interval belongs to the protection scope of the application.
In practical application, the direct-current voltage working range can be compared with the direct-current high-voltage power limiting interval of the photovoltaic dispatching system, and if an intersection exists between the direct-current voltage working range and the direct-current high-voltage power limiting interval, or the direct-current voltage working range is contained in the direct-current high-voltage power limiting interval, namely, the direct-current voltage working range falls into the direct-current high-voltage power limiting interval, the intersection exists between the direct-current voltage working range and the direct-current high-voltage power limiting interval of the photovoltaic dispatching system.
If it is determined that the intersection exists between the dc voltage operating range and the dc high voltage power limit section, step S103 is executed.
S103, adjusting the output power of at least one target scheduling object in the photovoltaic scheduling system to be smaller than a first preset value so that other target adjusting objects work in a non-direct-current high-voltage power limiting interval.
In practical application, if the photovoltaic dispatching system includes: the master controller, at least two sub-array dispatching controllers which are in communication connection with the master controller, and an inverter sub-array which is composed of at least two inverters which are in communication connection with the corresponding sub-array dispatching controllers, i.e. the photovoltaic dispatching system shown in fig. 2, the target adjustment object is an inverter sub-array or an inverter.
Specifically, when the receiving object of the power scheduling instruction is a master controller, the target adjustment object is an inverter sub-array; when the receiving object of the power scheduling instruction is a subarray scheduling controller, the target adjustment object is an inverter.
In practical applications, the output power of at least one target scheduling object in the photovoltaic scheduling system may be adjusted to be smaller than a first preset value or zero, so that the output power of other target adjusting objects is larger than a second preset value or corresponding maximum power. Wherein the first preset value is smaller than the second preset value.
It should be noted that, in practical application, the first preset value is set to be a low power close to zero, the second preset value can be a high power close to full power, and no matter what specific value is taken by the first preset value and the second preset value, the method belongs to the protection scope of the application.
Based on the above principle, the power scheduling method of the photovoltaic scheduling system provided by the embodiment can adjust the output power of part of the target adjustment objects through a software algorithm, so that each target adjustment object in the photovoltaic system works in a non-direct-current high-voltage power limiting interval range in the scheduling process, and the problem that an external scheduling instruction cannot be responded because each inverter in the photovoltaic system works in a direct-current high-voltage power limiting state in the scheduling process is avoided. In addition, as each inverter in the photovoltaic system works in a non-direct-current high-voltage power limiting interval range in the dispatching process, the problem of exceeding of the stress of the inverter can be avoided, the tolerance amount of internal devices of the inverter is not required to be increased, the photovoltaic system is not required to be improved by adding a shutoff device and other components, the photovoltaic system can be realized only through a software algorithm, and the hardware cost and the system cost of the inverter are saved.
In another embodiment provided in the present application, before executing the step S103 of adjusting the output power of at least one target scheduling object in the photovoltaic scheduling system to be smaller than the first preset value, referring to fig. 5, the power scheduling method of the photovoltaic scheduling system further includes:
and S301, calculating according to the power scheduling instruction and the direct-current high-voltage power limiting interval to obtain the adjustment quantity of the target scheduling object.
In practical application, if the target scheduling object is an inverter sub-array, the adjustment quantity of the inverter sub-array can be obtained by calculating according to the power scheduling instruction and the direct-current high-voltage power limiting interval. Wherein, the adjustment quantity includes: at a first preset value P Sub-array 1 or the number of inverter sub-arrays with zero power output.
If it is calculated by the assumption that the first preset value P Sub-array 1 or the number of the inverter subarrays with zero power output is n, n is a positive integer, and the rest inverter subarrays are at a second preset value P Sub-array 2 or the inverter sub-array corresponding to the maximum power output.
If the target scheduling object is an inverter, the adjustment quantity of the inverter can be obtained by calculating according to the power scheduling instruction and the direct-current high-voltage power limiting interval. Wherein, the adjustment quantity includes: at a first preset value P Inverter with a power supply 1 or the number of inverters with zero power output.
If it is calculated by the assumption that the first preset value P Inverter with a power supply 1 or the number of the inverters with zero power output is y, wherein y is a positive integer, and the rest inverters belonging to the same inverter sub-array are in a second preset value P Inverter with a power supply 2 or an inverter corresponding to the maximum power output.
In this embodiment, the number of the inverter sub-arrays or the inverters that need to be output with the first preset value or zero power is determined by calculating according to the power scheduling command and the dc high-voltage power limiting interval to obtain the adjustment number of the target scheduling object, so that the output power of each inverter sub-array or each inverter is adjusted in a targeted manner according to the obtained adjustment number, the adjustment process is simplified, and the adjustment speed is further improved.
In another embodiment provided in the present application, after executing step S102 to determine whether there is an intersection between the dc voltage operating range and the dc high voltage power limit section of the photovoltaic dispatching system, if it is determined that there is no intersection between the dc voltage operating range and the dc high voltage power limit section, referring to fig. 6, the power dispatching method of the photovoltaic dispatching system further includes:
s401, responding to the power scheduling instruction, and controlling each target scheduling object to output with equal power.
In practical application, after judging that no intersection exists between the direct-current voltage working range and the direct-current high-voltage power limiting interval of the photovoltaic dispatching system, it is indicated that each inverter in the photovoltaic dispatching system operates under the received power dispatching instruction and does not enter the direct-current high-voltage power limiting state, and therefore an object receiving the power dispatching instruction can respond to the power dispatching instruction to control each target dispatching object to output corresponding power.
Based on the method provided by the above embodiment, for providing a corresponding embodiment for the content of the above embodiment, for convenience of understanding, in conjunction with fig. 2, it is assumed that the receiving object of the power scheduling instruction is a master controller, and the target adjustment object is an inverter sub-array, and the following implementation process is specifically provided in the present invention:
the AGC/AVC receives an active dispatching command A1 and a reactive dispatching command B1, and calculates a direct-current voltage working range [ X1, Y1] according to the relation between the current power of each inverter and the PV voltage.
1.2. If [ X1, Y1] falls within the DC high voltage power limit interval [ X, Y ], then N sub-arrays are calculated to output with small power/zero power, and the rest sub-arrays are full power/larger power.
1.3. If [ X1, Y1] does not fall within the high voltage power limit interval [ X, Y ], all sub-arrays are scheduled to output at equal power.
If it is assumed that the receiving object of the power scheduling instruction is a subarray scheduling controller, the target adjustment object is an inverter, and in conjunction with fig. 2, the following implementation process is specifically implemented:
and 2.1. The log-er receives the active dispatching command A2 and the reactive dispatching command B2, and calculates the working range [ X2, Y2] of the direct-current voltage according to the relation between the current power and the PV voltage of each inverter.
2.2. If [ X2, Y3] falls in the direct current high voltage power limiting interval [ X, Y ], the small power/zero power output of N inverters is calculated, and the full power/larger power output of the rest inverters is calculated.
2.3. If [ X2, Y2] does not fall within the high voltage power limit interval [ X, Y ], all inverters under the inverter sub-array are scheduled to output at equal power.
Features described in the embodiments in this specification may be replaced or combined, and identical and similar parts of the embodiments may be referred to each other, where each embodiment focuses on differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
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 elements and steps are described above generally in terms of functionality in order to clearly illustrate the 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 solution. 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 relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (11)
1.A power scheduling method for a photovoltaic scheduling system, comprising:
after receiving a power scheduling instruction, determining a direct-current voltage working range of the photovoltaic scheduling system according to the relation between the current power and the PV voltage of each inverter in the photovoltaic scheduling system;
judging whether an intersection exists between the direct-current voltage working range and a direct-current high-voltage power limiting interval of the photovoltaic dispatching system;
if the intersection exists between the direct-current voltage working range and the direct-current high-voltage power limiting interval, adjusting the output power of at least one target scheduling object in the photovoltaic scheduling system to be smaller than a first preset value so that other target adjusting objects work in a non-direct-current high-voltage power limiting interval; the target adjustment object is an inverter subarray or an inverter;
after receiving a power scheduling instruction, determining a direct-current voltage working range of the photovoltaic scheduling system according to the relation between the current power and the PV voltage of each inverter in the photovoltaic scheduling system, wherein the method comprises the following steps:
determining target power of each inverter according to the power scheduling instruction;
respectively calculating according to the current power of each inverter and the corresponding PV voltage to obtain a target direct current voltage of each inverter under the target power;
and obtaining the working range of the direct current voltage according to each target direct current voltage.
2. The power dispatching method of the photovoltaic dispatching system according to claim 1, wherein obtaining the working range of the direct current voltage according to each target direct current voltage comprises:
taking the maximum value of all the target direct current voltages as the upper limit of the direct current voltage working range; the method comprises the steps of,
and taking the minimum value of all the target direct current voltages as the lower limit of the working range of the direct current voltages.
3. The power scheduling method of a photovoltaic scheduling system according to claim 1, wherein adjusting the output power of at least one target scheduling object in the photovoltaic scheduling system to be smaller than a first preset value, so that all other target adjustment objects operate in a non-dc high-voltage power limiting interval, comprises:
adjusting the output power of at least one target scheduling object in the photovoltaic scheduling system to be smaller than a first preset value or zero so that the output power of other target adjusting objects is larger than a second preset value or corresponding maximum power; wherein the first preset value is smaller than the second preset value.
4. The power scheduling method of a photovoltaic scheduling system according to claim 1, further comprising, before adjusting the output power of at least one target scheduling object in the photovoltaic scheduling system to be less than a first preset value:
and calculating according to the power scheduling instruction and the direct-current high-voltage power limiting interval to obtain the adjustment quantity of the target scheduling object.
5. The power scheduling method of a photovoltaic scheduling system according to any one of claims 1 to 4, wherein the photovoltaic scheduling system comprises: the system comprises a main controller, at least two subarray scheduling controllers and an inverter subarray, wherein the at least two subarray scheduling controllers are in communication connection with the main controller, and the inverter subarrays are formed by at least two inverters which are in communication connection with the corresponding subarray scheduling controllers;
the target adjustment object is the inverter subarray or an inverter.
6. The power scheduling method of the photovoltaic scheduling system according to claim 5, wherein when the receiving object of the power scheduling instruction is the master controller, the target adjustment object is the inverter sub-array.
7. The power scheduling method of a photovoltaic scheduling system according to claim 5, wherein when the receiving object of the power scheduling instruction is the subarray scheduling controller, the target adjustment object is an inverter.
8. The power scheduling method of any one of claims 1-4, wherein after determining whether there is an intersection between the dc voltage operating range and a dc high voltage power limit section of the photovoltaic scheduling system, if it is determined that there is no intersection between the dc voltage operating range and the dc high voltage power limit section, further comprising:
and responding to the power scheduling instruction, and controlling each target scheduling object to output with equal power.
9. The power scheduling method of a photovoltaic scheduling system according to any one of claims 1 to 4, wherein the power scheduling instruction includes: active dispatch instructions, and/or reactive dispatch instructions.
10. A photovoltaic scheduling system, comprising: the system comprises a master controller, at least two sub-array scheduling controllers and an inverter sub-array thereof; wherein:
the inverter sub-array comprises at least two inverters;
the subarray scheduling controller is in communication connection with each inverter in the corresponding inverter subarray;
the master controller is in communication connection with each subarray scheduling controller;
the master controller and/or the sub-array scheduling controller being configured to implement a power scheduling method of a photovoltaic scheduling system according to any one of claims 1-9.
11. The photovoltaic scheduling system of claim 10, wherein each of the inverter sub-arrays is individually controlled by at least one corresponding sub-array scheduling controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110406095.7A CN112952920B (en) | 2021-04-15 | 2021-04-15 | Photovoltaic dispatching system and power dispatching method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110406095.7A CN112952920B (en) | 2021-04-15 | 2021-04-15 | Photovoltaic dispatching system and power dispatching method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112952920A CN112952920A (en) | 2021-06-11 |
| CN112952920B true CN112952920B (en) | 2024-04-12 |
Family
ID=76232749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110406095.7A Active CN112952920B (en) | 2021-04-15 | 2021-04-15 | Photovoltaic dispatching system and power dispatching method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112952920B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140057760A (en) * | 2012-11-05 | 2014-05-14 | 한국전기연구원 | Limitation method of the current and regeneration power reference using the grid-side converter capacity connected with utility grid |
| CN107154647A (en) * | 2017-06-08 | 2017-09-12 | 阳光电源股份有限公司 | The power deratng method and controller of a kind of photovoltaic generating system |
| CN108258718A (en) * | 2016-12-29 | 2018-07-06 | 北京天诚同创电气有限公司 | Inverter, collecting and distributing type header box, limit power control system and method |
| CN109066773A (en) * | 2018-08-01 | 2018-12-21 | 南京南瑞继保电气有限公司 | A kind of method that photovoltaic plant inverter carries out fast power response |
| CN111342445A (en) * | 2020-04-03 | 2020-06-26 | 南京安贝旭电力科技有限公司 | Shared photovoltaic conversion system and maximum power point tracking method |
-
2021
- 2021-04-15 CN CN202110406095.7A patent/CN112952920B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140057760A (en) * | 2012-11-05 | 2014-05-14 | 한국전기연구원 | Limitation method of the current and regeneration power reference using the grid-side converter capacity connected with utility grid |
| CN108258718A (en) * | 2016-12-29 | 2018-07-06 | 北京天诚同创电气有限公司 | Inverter, collecting and distributing type header box, limit power control system and method |
| CN107154647A (en) * | 2017-06-08 | 2017-09-12 | 阳光电源股份有限公司 | The power deratng method and controller of a kind of photovoltaic generating system |
| CN109066773A (en) * | 2018-08-01 | 2018-12-21 | 南京南瑞继保电气有限公司 | A kind of method that photovoltaic plant inverter carries out fast power response |
| CN111342445A (en) * | 2020-04-03 | 2020-06-26 | 南京安贝旭电力科技有限公司 | Shared photovoltaic conversion system and maximum power point tracking method |
Non-Patent Citations (2)
| Title |
|---|
| Coordinated Control of Distributed Three-and Single-Phase Inverters Connected to Three-Phase Three-Wire Microgrids;Danilo I. Brandao et al.;《IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS》;第8卷(第4期);第3861-3877页 * |
| 光伏电站功率快速控制应用研究;米高祥等;《湖北电力》;第43卷(第6期);第86-93页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112952920A (en) | 2021-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2019128037A1 (en) | Photovoltaic power plant and secondary frequency modulation control method therefor | |
| US10404072B2 (en) | Method and apparatus for bidirectional storage and renewable power converter | |
| JP5756348B2 (en) | Power generation system and power generation apparatus | |
| CN105591391B (en) | Reactive voltage control method for wind-solar-storage combined power station | |
| US9898018B2 (en) | Power clipping method and system | |
| CN108258718B (en) | Inverter, distributed combiner box, power limiting control system and method | |
| US20120232711A1 (en) | Control system, correction device, and power control method | |
| JP2008154445A (en) | System and method for controlling micro grid | |
| EP4131700A2 (en) | Inverter parallel system and zero feed-in control method therefor | |
| KR20170125291A (en) | Apparatus of controlling power generation for blocking reverse power of photovoltaics system and method thereof | |
| US20170141577A1 (en) | Grid-tied solar photovoltaic power system with dynamic grid power stabilization | |
| Yadav et al. | Small‐signal modeling based hybrid optimized current and voltage controller for unbalanced DC microgrid | |
| CN112952920B (en) | Photovoltaic dispatching system and power dispatching method thereof | |
| JP2017118721A (en) | Power generation system | |
| CN111211567A (en) | Island micro-grid distributed optimal frequency adjusting method based on event trigger mechanism | |
| US20220320866A1 (en) | Power system and control method | |
| WO2022107583A1 (en) | Power system and method for controlling power system | |
| JP7401846B2 (en) | Posiwatt trading support device and Posiwatt trading method | |
| CN112821449B (en) | Doubly-fed wind power generation system, converter thereof and power control method | |
| JP7354726B2 (en) | Negawatt trading support device and negawatt trading method | |
| Finamor et al. | Solar photovoltaic static conversion system applied to a smart microgrid | |
| Zhang et al. | Adaptive power sharing scheme for parallel‐connected hybrid inverters in microgrid | |
| KR102542964B1 (en) | Distribution network management system using distributed control | |
| JP7351168B2 (en) | Negawatt trading support device and negawatt trading method | |
| CN109217378B (en) | Power fluctuation adjusting method and device suitable for new energy |
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 |