CN110896230B - SOFC power generation system and control method thereof - Google Patents
SOFC power generation system and control method thereof Download PDFInfo
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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
- 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
Abstract
The invention provides an SOFC power generation system and a control method of the SOFC power generation system, relates to the technical field of electricians, and aims to solve the technical problem that when the SOFC power generation system comprises a plurality of SOFC power generation units, the structure and the control process of the SOFC power generation system are complex due to the fact that independent cell compensation devices are arranged for the SOFC power generation units. The SOFC power generation system provided by the present invention includes: the system comprises an SOFC power generation subsystem, a battery compensation subsystem and a controller which is respectively coupled with the SOFC power generation subsystem and the battery compensation subsystem; the SOFC power generation subsystem and the battery compensation subsystem are jointly connected to the alternating current bus to realize grid connection, and the SOFC power generation subsystem provides output power for a power grid through a plurality of SOFC power generation units; the controller controls the battery compensation subsystem to provide power compensation for the power grid according to the output power of the SOFC power generation subsystem and the command power of the SOFC power generation system. The method is used for simplifying the structure of the SOFC power generation system and the control process of the SOFC power generation system while ensuring that the SOFC power generation system realizes quick and dynamic response.
Description
Technical Field
The invention relates to the technical field of electricians, in particular to an SOFC power generation system and a control method of the SOFC power generation system.
Background
The oxide fuel cell SOFC is a power generation device adopting electrochemical power generation, has higher power generation efficiency, and has little pollution to the environment because the power generation products are mostly water and carbon dioxide, thereby having great development prospect in the aspect of clean energy.
At present, due to the complicated mass and heat transfer process involved in SOFC power generation, there is usually a problem of slow dynamic response in SOFC-based power generation, for example, it is difficult for SOFC power generation to quickly adjust output power according to a received grid power instruction during grid-connected operation, or to quickly track load charge change during island operation, and so on. In order to solve the above problems, conventionally, a device such as a battery having a fast response characteristic connected to the SOFC is provided on the SOFC side as a cell compensation device of the SOFC, and the dynamic response of the SOFC power generation system is compensated by the cell compensation device, thereby improving the dynamic response speed of the SOFC.
However, in actual circumstances, the SOFC power generation system includes a plurality of SOFC power generation units, and if the compensation method in the related art is adopted, it is necessary to provide a cell compensation device connected to each SOFC power generation unit in the plurality of SOFC power generation units, and the number of cell compensation devices provided is large and distributed, which complicates the overall structure and control process of the SOFC power generation system, and requires a large amount of work for maintenance of the SOFC power generation system.
Disclosure of Invention
The embodiment of the invention provides an SOFC power generation system and a control method of the SOFC power generation system, which are used for solving the technical problem that when the SOFC power generation system comprises a plurality of SOFC power generation units, the SOFC power generation system is complex in structure and control process due to the fact that independent cell compensation devices are arranged for the SOFC power generation units.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, the present invention provides a SOFC power generation system comprising: the system comprises an SOFC power generation subsystem, a battery compensation subsystem and a controller; wherein the content of the first and second substances,
the SOFC power generation subsystem and the battery compensation subsystem are connected to an alternating current bus of a power grid to realize grid connection, and the controller is respectively coupled with the SOFC power generation subsystem and the battery compensation subsystem; the SOFC power generation subsystem comprises a plurality of SOFC power generation units;
the SOFC power generation subsystem is used for providing output power to a power grid through a plurality of SOFC power generation units;
the controller is used for controlling the cell compensation subsystem to provide compensation power to the power grid according to the output power of the SOFC power generation subsystem and the instruction power of the SOFC power generation system.
Therefore, in the power generation system provided by the invention, the power output by the SOFC power generation units in the SOFC power generation subsystem can be compensated at the alternating current side of the alternating current output by the SOFC power generation units, and the controller is arranged to control the cell compensation subsystem to provide the compensation power to the power grid according to the power output by the SOFC power generation subsystem to the power grid, so that the technical problem that the structure and the control process of the SOFC power generation system are complicated due to the fact that independent cell compensation devices are required to be arranged for the SOFC power generation units in the SOFC power generation system is effectively solved, and the purposes of ensuring the SOFC power generation system to realize quick dynamic response and simplifying the structure of the SOFC power generation system and the control process of the SOFC power generation system are realized.
Optionally, the SOFC power generation unit comprises:
the SOFC power generation unit is coupled with the first PCS unit; the first PCS unit is coupled with the alternating current bus;
the SOFC power generation subunit is used for generating direct current;
the first PCS unit is used for converting direct current generated by the SOFC power generation subunit into alternating current after boosting treatment and outputting the alternating current to the alternating current bus.
Optionally, the battery compensation subsystem comprises:
a battery compensation unit and a second PCS unit, wherein the battery compensation unit is coupled to the second PCS unit; the second PCS unit is coupled with the alternating current bus;
the battery compensation unit is used for outputting the stored direct current to the second PCS unit;
and the second PCS unit is used for converting the direct current output by the battery compensation unit into alternating current after boosting and outputting the alternating current to an alternating current bus.
Optionally, the controller is specifically configured to:
acquiring output power output by the SOFC power generation subsystem and instruction power of the SOFC power generation system;
determining compensation power according to the output power and the instruction power;
and sending a power control command containing the compensation power to the battery compensation subsystem so as to control the battery compensation subsystem to provide the compensation power to the power grid.
Optionally, the battery compensation unit is a storage battery.
Optionally, the power generation subsystem and the battery compensation subsystem are connected in parallel.
Optionally, a plurality of SOFC power generation units are connected in parallel.
Optionally, when the SOFC power generation unit includes the SOFC power generation unit and the first PCS unit, the controller includes: a PCS controller and an SOFC power generation unit controller; wherein the content of the first and second substances,
the SOFC power generation unit controller is used for controlling the operation parameters of the SOFC power generation subunit so as to provide power for the first PCS unit by the SOFC power generation subunit according to the operation parameters;
and the PCS controller is used for controlling the first PCS unit to provide output power to a power grid according to the power output by the SOFC power generation electronic unit.
In a second aspect, a method for controlling a SOFC power generation system is provided,
the SOFC power generation system comprises the SOFC power generation subsystem and a cell compensation subsystem, and the method comprises the following steps:
acquiring output power output by the SOFC power generation subsystem and instruction power of the SOFC power generation system;
determining compensation power according to the output power and the instruction power;
and sending a power control command containing the compensation power to the battery compensation subsystem so as to control the battery compensation subsystem to provide the compensation power to the power grid.
Optionally, obtaining power output by the SOFC power generation subsystem includes: and acquiring the sum of the power output by the SOFC power generation units.
It can be understood that the control method of the SOFC power generation system provided above is applied to the SOFC power generation system corresponding to the first aspect provided above, and therefore, the beneficial effects that can be achieved by the control method can refer to the beneficial effects of the SOFC power generation system of the first aspect and the corresponding solutions in the following detailed description, and are not repeated here.
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, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and the drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the present invention.
Figure 1a shows a schematic diagram of a cell compensation device on the dc side of a SOFC unit;
fig. 1b shows another architecture diagram for accessing the cell compensation device at the dc side of the SOFC unit;
figure 1c shows an architectural diagram of a SOFC power generation system;
fig. 2a shows an architecture diagram of a SOFC power generation system according to an embodiment of the present invention;
fig. 2b shows another architecture diagram of a SOFC power generation system provided by an embodiment of the present invention;
fig. 3 shows a flowchart of a control method in an SOFC power generation system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application. The use of the terms first, second, etc. do not denote any order, and the terms first, second, etc. may be interpreted as names of the objects described. In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
Before describing the embodiment of the present invention, a brief description will be given to a manner of compensating for the dynamic response of the current SOFC power generation. Specifically referring to fig. 1a and 1b, in the SOFC power generation system, the SOFC unit used to generate the dc power outputs the generated dc power through a port of the SOFC unit, and since the port of the SOFC unit outputs the dc power at a low voltage, before grid connection, the dc power needs to be output to the energy storage bidirectional inverter PCS unit for boosting, and the dc power needs to be converted into ac power and then connected to the ac bus of the power grid to achieve grid connection (the arrows in fig. 1a and 1b indicate the flow of current, and the voltage of the ac bus is 10 KV). The PCS unit comprises a direct current voltage converter (DC/DC) and an inverter (DC/AC), direct current generated on the SOFC unit is firstly output to the direct current voltage converter through a port of the SOFC unit to be subjected to boosting processing, and is output to the inverter through a port of the direct current voltage converter to convert the direct current into alternating current, the alternating current is output to an alternating current bus of a power grid through a port of the inverter to achieve grid connection, and the direct current voltage converter and the inverter are coupled through the direct current bus of the PCS unit. The storage battery is used as a battery compensation device and is connected to the direct current bus of the PCS unit so as to be connected with the SOFC unit in parallel on the side of the SOFC unit outputting direct current, and the direct current output by the direct current voltage converter is compensated through outputting compensation direct current; and finally, the compensation direct current and the direct current output by the direct current voltage converter are jointly output to an inverter through a direct current bus of the PCS unit so as to convert the direct current into alternating current, and the alternating current is output to an alternating current bus of a power grid through a port of the inverter so as to realize grid connection. In the compensation mode shown in fig. 1a, a direct-current bus of the storage battery directly connected to the PCS unit is coupled with a direct-current bus of the PCS unit; in the compensation mode shown in fig. 1b, the battery is coupled to the bidirectional dc voltage converter, and the battery is coupled to the dc bus of the PCS unit via the dc bus of the bidirectional dc voltage converter connected to the PCS unit. As can be seen, the compensation method shown in fig. 1a and 1b can be implemented by connecting a storage battery as a battery compensation device to the SOFC unit on the side outputting the dc power to compensate for the dynamic response of the SOFC unit during power generation.
However, the SOFC unit is an SOFC single body composed of one or more SOFC power generation stacks connected in series and/or in parallel to each other for outputting direct current. In practice, when only one SOFC unit is provided in the SOFC power generation system, the entire SOFC power generation system may not operate normally if the SOFC unit is damaged, and in order to avoid such a situation and improve the reliability of the SOFC power generation system, the SOFC power generation system may be provided as shown in fig. 1 c. Referring to fig. 1c, in the SOFC power generation system, a plurality of SOFC power generation units (n SOFC power generation units, that is, SOFC power generation unit 01, SOFC power generation unit 02, and SOFC power generation unit 03 … SOFC power generation units n shown in fig. 1 c) are provided, and one SOFC unit and a PCS unit coupled to the SOFC unit are provided in each SOFC power generation unit. When one SOFC power generation unit is damaged, if other SOFC power generation units work normally, the normal operation of the SOFC power generation system can be ensured, and the stability and reliability of the SOFC power generation system are effectively improved; meanwhile, when the SOFC power generation system is maintained, only the damaged SOFC power generation unit needs to be disassembled and replaced, and the workload of maintaining the SOFC power generation system is greatly reduced. However, when the dynamic response compensation is performed for the plurality of SOFC power generation units, if the conventional dynamic response compensation method for the SOFC is adopted, it is necessary to provide an independent cell compensation device for each of the plurality of SOFC power generation units, which results in a large and distributed number of cell compensation devices, a complicated structure and control process of the SOFC power generation system, and a large amount of work required for maintenance of the SOFC power generation system.
In order to solve the above existing problems, the present invention provides an SOFC power generation system, as shown in fig. 2a, including: an SOFC power generation subsystem, a cell compensation subsystem, and a controller.
The SOFC power generation subsystem and the battery compensation subsystem are mutually independent in physical structure, are communicated with a power grid through an alternating current bus connected into the power grid to achieve grid connection, and are connected in parallel on one side of the alternating current bus of the power grid. In order to enable the SOFC power generation system to output stable power and improve the reliability of the SOFC power generation system, the SOFC power generation subsystem comprises a plurality of SOFC power generation units, alternating current buses of the SOFC power generation units, which are respectively connected to a power grid, are connected with the power grid to achieve grid connection, and the SOFC power generation units are connected in parallel on one side of the alternating current buses of the power grid.
The controller is respectively coupled with the SOFC power generation subsystem and the battery compensation subsystem and used for acquiring electric signals of the SOFC power generation subsystem and the battery compensation subsystem and controlling the power output by the SOFC power generation subsystem to a power grid. The SOFC power generation subsystem is used for providing output power for a power grid, and the controller is used for controlling the battery compensation subsystem to provide compensation power for the power grid according to the output power of the SOFC power generation subsystem and the instruction power of the SOFC power generation system.
The SOFC power generation subsystem comprises a plurality of SOFC power generation units, the SOFC power generation subsystem provides output power for a power grid through the SOFC power generation units, the controller can be respectively coupled with each SOFC power generation unit in the SOFC power generation subsystem, the controller obtains corresponding electric signals from the SOFC power generation units and obtains power output by each SOFC power generation unit according to the electric signals, and then the sum of the power output by the SOFC power generation units is used as the output power output by the SOFC power generation subsystem to the power grid.
In specific implementation, the number of the SOFC power generation units is determined according to the power generation capacity of the SOFC power generation system. The larger the power generation capacity of the SOFC power generation system is, the larger the number of SOFC power generation units provided correspondingly increases. Therefore, in an SOFC power generation system with a large power generation capacity, the SOFC power generation subsystem may include hundreds or even thousands of SOFC power generation units, and if a compensation method is adopted in which a battery compensation device is connected in parallel to one side of each SOFC power generation unit that outputs direct current, a plurality of battery compensation devices as many as the SOFC power generation units need to be provided, which results in a complicated structure of the SOFC power generation system and a large amount of work required for maintenance. According to the SOFC power generation subsystem and the cell compensation subsystem, the SOFC power generation subsystem and the cell compensation subsystem are connected in parallel at one side of the alternating current bus of the power grid, so that the power output by the SOFC power generation unit can be compensated at the alternating current side of the alternating current output by the SOFC power generation unit, a large number of cell compensation devices do not need to be arranged in the SOFC power generation system, the structure and the control process of the SOFC power generation system are greatly simplified, and the workload required for maintaining the SOFC power generation system is effectively reduced.
In specific implementation, the controller in the SOFC power generation system may receive a power grid scheduling instruction, and dynamically adjust output power output by the SOFC power generation subsystem to the power grid according to instruction power (i.e., power that the SOFC power generation system currently needs to output to the power grid) included in the power grid scheduling instruction, so that the output power finally reaches the instruction power; the controller compensates the power difference between the output power and the instruction power by controlling the compensation power output to the power grid by the battery compensation subsystem, so that the sum of the output power output to the power grid by the SOFC power generation subsystem and the compensation power output to the power grid by the battery compensation subsystem is equal to the instruction power contained in the power grid scheduling instruction. Because the battery compensation subsystem has the characteristic of quick response, the output power and the instruction power can be quickly tracked in real time, so that the quick response in the power conversion process of the SOFC power generation system is realized, the power stability output to a power grid by the SOFC power generation system is ensured, and the power dispatching instruction is quickly tracked.
The controller may be coupled to the SOFC power generation subsystem and the cell compensation subsystem in a direct electrical connection or indirectly through other intermediate components, such as sensors disposed between the controller and each SOFC power generation unit of the SOFC power generation subsystem, sensors to collect electrical signals generated at each SOFC power generation unit, and so on. In a specific implementation, the type and the specific arrangement of the sensors may be set by those skilled in the art according to actual situations, and the present invention is not limited to this.
The controller may be a separately provided controller or may be composed of a plurality of controllers, for example, the controller may be separately provided for each SOFC power generation unit, and the controller may be separately provided for the cell compensation subsystem; the controller may also be provided separately for each SOFC power generation sub-unit and separately for each PCS (see description below), although it is understood that the controller provided separately for each PCS unit may also be directly multiplexed within the PCS unit. It is understood that the controller can implement the function of a controller provided separately for each SOFC power generation unit, the function of a controller provided separately for the cell compensation subsystem, or the function of a controller provided separately for each SOFC power generation sub-unit, and the function of a controller provided separately for each PCS unit. A preferred embodiment of the present invention is described in detail below. Specifically, as shown in fig. 2b, the SOFC power generation system includes: SOFC power generation subsystem 21, cell compensation subsystem 22, first controller, second controller, PCS controller, SOFC power generation unit controller, and system controller.
The SOFC power generation subsystem 21 is first described. The SOFC power generation subsystem 21 includes a plurality of SOFC power generation units 210, each SOFC power generation unit 210 further including: an SOFC power generation sub-unit 211 and a first energy storage bidirectional inverter PCS unit 212. The SOFC power generation unit 211 may include one or more SOFC power generation stacks connected in series and/or in parallel to each other for generating electric power and outputting direct current; the SOFC generating unit 211 is coupled to the first PCS unit 212, so that the first PCS unit 212 receives the dc power output by the SOFC generating unit 211 and boosts the dc power; meanwhile, the first PCS unit 212 is coupled to an ac bus of the power grid, and the first PCS unit 212 converts the dc power after the voltage boosting process into ac power and outputs the ac power to the ac bus.
Specifically, the first PCS unit 212 may specifically include: direct current voltage converters (DC/DC) and inverters (DC/AC). A first input port of the direct current voltage converter is coupled with a first output port of the SOFC power generation subunit 211, a second output port of the direct current voltage converter is coupled with a second input port of the inverter, and direct current generated on the SOFC power generation subunit 211 is output through the first output port and is output to the direct current voltage converter through the first input port to be subjected to boosting processing so as to reach a preset voltage; and the direct current reaching the preset voltage is output from the second output port and is output to the inverter through the second input port so as to convert the direct current into alternating current, and finally the inverter outputs the alternating current to the alternating current bus through the third output port of the inverter so as to realize grid connection. In a specific implementation, the magnitude of the preset voltage may be set by a person skilled in the art according to an actual situation, and the present invention is not limited thereto. The above-mentioned coupling means may be an electrical connection.
Specifically, the battery compensation subsystem 22 is configured to output the compensation power to the power grid, and the battery compensation subsystem 22 may specifically include: a battery compensation unit 221 and a second PCS unit 222. Wherein the battery compensation unit 221 may be a battery or other device capable of providing electric energy with fast response characteristics, and the battery compensation unit 221 is coupled with the second PCS unit 222 to output the stored dc power to the second PCS unit; the second PCS unit 222 is coupled to an ac bus of the power grid, and is configured to boost the dc power output by the battery compensation unit 221, convert the dc power into ac power, and output the ac power to the ac bus of the power grid. The operation of the second PCS unit 222 is the same as that of the first PCS unit 212, and reference may be made to the above description for the operation of the first PCS unit 212, which is not repeated herein. The battery compensation subsystem 22 outputs a compensated power to the grid as determined by the system controller.
Specifically, the setting mode of the controller may be: a first controller corresponding thereto is provided for each first PCS unit 212, a second controller corresponding thereto is provided for each SOFC light-generating electronic unit 211, and a cell compensation subsystem controller is provided for cell compensation subsystem 22. Wherein each first PCS unit 212 is coupled to its corresponding first controller, and each SOFC light-emitting electronic unit 211 is coupled to its corresponding second controller; the first controller and the battery compensation subsystem controller are commonly coupled to the PCS controller to realize information interaction with the PCS controller. The second controller is coupled to the SOFC power generation unit controller to enable information interaction with the SOFC power generation unit controller. The above-mentioned coupling means may be an electrical connection.
In a specific implementation, the SOFC power generation unit controller is configured to control operating parameters of the SOFC power generation sub-units, such as a gas flow rate and a gas flow rate provided by an external device to each SOFC power generation sub-unit, and a reaction temperature of each SOFC power generation sub-unit, so that the SOFC power generation sub-units provide power to the first PCS unit according to the operating parameters.
And the PCS controller is used for controlling the first PCS unit to provide output power to a power grid according to the power output by the SOFC power generation electronic unit. Wherein, the power output by each SOFC transmitting unit to the first PCS unit is determined by a first controller (i.e. a controller provided separately for each first PCS unit or a controller within the first PCS unit), and the PCS controller controls the power output by each SOFC transmitting unit to the first PCS unit and controls the power supplied by the first PCS unit to the grid according to the power output by each SOFC transmitting unit to the first PCS unit. The power provided by the first PCS unit to the grid is: and the SOFC power generation unit where the first PCS unit is located outputs power to a power grid. The PCS controller obtains the power output to the power grid by each SOFC power generation unit through the first controller, and the sum of the power output to the power grid by all the SOFC power generation units is used as the output power output by the SOFC power generation subsystem.
The system controller determines the compensation power according to the output power and the instruction power, which are acquired by the PCS controller, of the SOFC power generation subsystem, and then sends a power control instruction containing the compensation power to the battery compensation subsystem through the PCS controller so as to control the battery compensation subsystem to provide the compensation power for the power grid.
In a specific implementation, when obtaining the compensation power, a specific process of the compensation power may be that, in a grid-connected operation process of the SOFC power generation system, the first controller obtains, in real time, powers P1, P2, and P3 … Pn output by each SOFC power generation unit to a power grid, the system controller collects the powers through the PCS controller, and obtains a sum of the powers as an output power Pt (Pt — P1+ P2+ P3 … + Pn) output by the SOFC power generation subsystem 21 to the power grid, and obtains a command power Pm of the SOFC power generation system from a received power grid scheduling command, and calculates the compensation power by:
and Δ P is Pm-Pt, wherein Δ P is compensation power.
Therefore, the SOFC power generation system provided by the invention compensates the output power of the SOFC power generation units in the SOFC power generation subsystem at the AC side of the AC output of the SOFC power generation subsystem, and obtains the compensation power required to be provided for the power grid according to the power output to the power grid by each SOFC power generation unit and the instruction power, namely, the invention can directly control the AC side of the cell compensation subsystem to directly provide the compensation power to the power grid according to the calculated compensation power, the control process is simple and efficient, the complex process of respectively controlling the compensation DC output by the plurality of cell compensation devices due to the plurality of cell compensation devices corresponding to the plurality of SOFC power generation units when the compensation DC is provided from the DC side of the SOFC power generation unit by adopting the traditional compensation mode is greatly simplified, and the problem of effectively solving the problem that the power generation system is caused by the independent SOFC compensation devices arranged for the plurality of SOFC power generation units The technical problem of complex structure and control process is solved, and the purposes of simplifying the structure of the SOFC power generation system and the control process of the SOFC power generation system are achieved while the fast dynamic response of the SOFC power generation system is guaranteed.
The present invention provides a control method for an SOFC power generation system, as shown in fig. 3, the method being applied to the SOFC power generation system, the method including the steps of:
step S310: and acquiring the output power output by the SOFC power generation subsystem and the instruction power of the SOFC power generation system.
However, since the SOFC power generation subsystem includes a plurality of SOFC power generation units, in this step, the sum of the powers output by the plurality of SOFC power generation units can be specifically obtained as the output power output by the SOFC power generation subsystem. The commanded power for the SOFC power generation system may be obtained from the grid dispatching commands.
Step S320: and determining the compensation power according to the output power and the instruction power.
In a specific implementation, the difference between the output power and the command power can be used as the compensation power.
Step S330: and sending a power control command containing the compensation power to the battery compensation subsystem so as to control the battery compensation subsystem to provide the compensation power to the power grid.
All relevant contents of the steps related to the above method embodiments may be referred to the functional description of the corresponding functional module, and the functions thereof are not described herein again.
It should be noted that, in this document, 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 like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the present embodiments are not limited to those precise embodiments, which are intended to be illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope of the appended claims.
Claims (3)
1. An SOFC power generation system, comprising: an SOFC power generation subsystem, a battery compensation subsystem, and a controller; wherein the content of the first and second substances,
the SOFC power generation subsystem and the battery compensation subsystem are connected to an alternating current bus together in a parallel mode to achieve grid connection, and the controller is coupled with the SOFC power generation subsystem and the battery compensation subsystem respectively; wherein the SOFC power generation subsystem comprises a plurality of SOFC power generation units; the SOFC power generation units are connected in parallel on one side of the alternating current bus of the power grid;
the SOFC power generation subsystem is used for providing output power to the power grid through the plurality of SOFC power generation units;
the controller is used for controlling the cell compensation subsystem to provide compensation power to the power grid according to the output power of the SOFC power generation subsystem and the instruction power of the SOFC power generation system, so that the sum of the output power of the SOFC power generation subsystem and the compensation power of the cell compensation subsystem is equal to the instruction power;
the SOFC power generation unit includes:
an SOFC generator unit and a first PCS unit, the SOFC generator unit coupled with the first PCS unit; the first PCS unit is coupled with the alternating current bus;
the SOFC power generation subunit is used for generating direct current;
the first PCS unit is used for converting direct current generated by the SOFC power generation sub-unit into alternating current after voltage boosting treatment and outputting the alternating current to the alternating current bus;
the battery compensation subsystem includes:
a battery compensation unit and a second PCS unit, wherein the battery compensation unit is coupled to the second PCS unit; the second PCS unit is coupled with the alternating current bus; the battery compensation unit is a storage battery;
the battery compensation unit is used for outputting the stored direct current to the second PCS unit;
and the second PCS unit is used for boosting the direct current output by the battery compensation unit, converting the direct current into alternating current and outputting the alternating current to the alternating current bus.
2. The SOFC power generation system of claim 1, wherein the controller is specifically configured to:
acquiring output power output by the SOFC power generation subsystem and instruction power of the SOFC power generation system;
determining compensation power according to the output power and the command power;
and sending a power control command containing the compensation power to the battery compensation subsystem so as to control the battery compensation subsystem to provide the compensation power to the power grid.
3. The SOFC power generation system of claim 2, wherein when the SOFC power generation unit comprises a SOFC power generation unit and a first PCS unit,
the controller includes: a PCS controller and an SOFC power generation unit controller; wherein the content of the first and second substances,
the SOFC power generation unit controller is used for controlling the operation parameters of the SOFC power generation subunit so that the SOFC power generation subunit provides power to the first PCS unit according to the operation parameters;
the PCS controller is used for controlling the first PCS unit to provide output power to the power grid according to the power output by the SOFC power generation unit.
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