CN113437758B - Photovoltaic grid-connected system and metering method for cement plant - Google Patents
Photovoltaic grid-connected system and metering method for cement plant Download PDFInfo
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- CN113437758B CN113437758B CN202110709341.6A CN202110709341A CN113437758B CN 113437758 B CN113437758 B CN 113437758B CN 202110709341 A CN202110709341 A CN 202110709341A CN 113437758 B CN113437758 B CN 113437758B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/063—Details of electronic electricity meters related to remote communication
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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
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
- H02J3/472—For selectively connecting the AC sources in a particular order, e.g. sequential, alternating or subsets of sources
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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
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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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- 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 embodiment of the invention provides a photovoltaic grid-connected system and a metering method for a cement plant, and belongs to the technical field of power generation grid connection. The photovoltaic grid-connected system of the cement plant comprises: the system comprises a waste heat power generation grid-connected unit and a photovoltaic power generation grid-connected unit; the photovoltaic power generation grid-connected unit comprises: the photovoltaic voltage transformer cabinet is connected with the photovoltaic power generation grid-connected cabinet; the waste heat power generation grid-connected unit is connected into the photovoltaic power generation grid-connected unit through the sectional cabinet, and the photovoltaic power generation grid-connected unit is connected into a power grid through a grid-connected access point; and the grid-connected access point, the subsection cabinet and the photovoltaic power generation grid-connected cabinet are all connected with a bidirectional metering ammeter in series. The scheme of the invention ensures that the waste heat power generation system online electric quantity and the photovoltaic power generation online electric quantity can be orderly distinguished no matter in which power generation working state, and the intelligent management of the generated energy of the cement plant area of the photovoltaic power generation system is realized.
Description
Technical Field
The invention relates to the technical field of power generation grid connection, in particular to a photovoltaic grid connection system of a cement plant and a photovoltaic grid connection metering method of the cement plant.
Background
The entity manufacturing industry is more and more inclined towards intelligent management and clean production, and on the premise of ensuring the capacity of a factory, how to reduce the cost and obtain the most efficient return on income is a problem that more and more manufacturers think. In the cement manufacturing industry, because of a plurality of high-temperature operation projects, a large amount of waste heat can be generated after normal production, and if the waste heat is not recycled, great energy waste can be caused. Therefore, the existing cement plant area is provided with a waste heat power generation system, the produced waste heat is used for on-site power generation, the generated energy is used nearby in the plant area, if surplus electric quantity still exists in the waste heat power generation system for supplying power to the plant area, the surplus electric quantity can be fed into a mains supply power grid through a grid-connected point, and a part of online electric charge is earned, so that the waste heat power generation system has great significance for clean construction and income creating of the plant area.
The cement plant area is often very big in area, has a lot of vacant lands that idle, and factory building area in the plant area is also big, and the idle roof area of these factory buildings is also very big. Therefore, the building method is an ideal building place for the photovoltaic system no matter on the idle ground or on the idle roof. Therefore, in order to further improve the utilization rate of the land in the plant area and the income creating capability of the plant area, more and more cement plant areas are built with ground photovoltaic systems and roof photovoltaic systems on idle open lands and idle roofs. The power utilization capacity in the plant area is limited, and the surplus electric quantity is uploaded to the power grid after the surplus electric quantity is used, so that the grid-connected mode of the waste heat power generation system and the photovoltaic power generation system has to be integrated and distributed, the intelligent management of internet surfing is realized, and the respective uploading electric quantity of the two power generation systems cannot be clearly obtained. The existing cement plant area is still a technical blank, namely an effective dual power generation system integration mode is not found, the independent internet surfing is adopted, and the intelligent and ordered management of the plant area is greatly influenced. Based on the above problems, a new photovoltaic grid-connected system and a new photovoltaic grid-connected metering method for a cement plant need to be created.
Disclosure of Invention
The invention aims to provide a photovoltaic grid-connected system and a metering method for a cement plant, and at least solves the problem of management difficulty caused by independent grid connection of double power generation systems of the cement plant.
In order to achieve the above object, a first aspect of the present invention provides a photovoltaic grid-connected system for a cement plant, which is applied to combined grid-connected control of a waste heat power generation system and a photovoltaic power generation system of the cement plant, and the system includes: the system comprises a waste heat power generation grid-connected unit and a photovoltaic power generation grid-connected unit; the photovoltaic power generation grid-connected unit comprises: the photovoltaic grid-connected power generation system comprises a subsection cabinet, a photovoltaic power generation grid-connected cabinet and a photovoltaic voltage transformer cabinet which are connected in parallel; the waste heat power generation grid-connected unit is connected to the photovoltaic power generation grid-connected unit through the sectional cabinet, and the photovoltaic power generation grid-connected unit is connected to a power grid through a grid-connected access point; and the grid-connected access point, the subsection cabinet and the photovoltaic power generation grid-connected cabinet are all connected with a bidirectional metering ammeter in series.
Optionally, the sectional cabinet, the photovoltaic power generation grid-connected cabinet and the photovoltaic voltage transformer cabinet are 10kV medium voltage cabinets.
The invention provides a photovoltaic grid-connected metering method of a cement plant, which is applied to the photovoltaic grid-connected system of the cement plant, and the method comprises the following steps: acquiring working state information of a waste heat power generation system and working state information of a photovoltaic power generation system; determining the internet surfing rules of the waste heat power generation system and the photovoltaic power generation system based on a preset rule according to the working state information of the waste heat power generation system and the working state information of the photovoltaic power generation system; determining a bidirectional metering ammeter for acquiring internet surfing electric quantity data according to the internet surfing rules; and acquiring the data of the internet surfing electric quantity through the determined bidirectional metering electric meter.
Optionally, the working state information includes: current signal information and voltage signal information.
Optionally, the waste heat power generation system and the photovoltaic power generation system both adopt a grid-connected mode of self-generation and waste electricity internet access. Optionally, the preset rule includes the following working states: the first working state: only the waste heat power generation system operates, and the waste heat power generation system needs to be on line with the surplus power; the second working state: only the photovoltaic power generation system operates, and the photovoltaic power generation system needs to be on line with surplus power; a third working state: the waste heat power generation system and the photovoltaic power generation system run simultaneously, and the waste heat power generation system and the photovoltaic power generation system have waste electricity and need to be on line; the fourth working state: the waste heat power generation system and the photovoltaic power generation system run simultaneously, the photovoltaic power generation system needs to be connected with the Internet when the waste heat power is available, and the waste heat power generation system needs to get electricity through a power grid.
Optionally, the preset rules further include internet surfing rules corresponding to the working states one to one: a first internet access rule corresponding to the first working state: residual electricity of the waste heat power generation system is fed into a power grid through the sectional cabinet and the incoming line cabinet; a second internet access rule corresponding to the second working state: residual electricity of the photovoltaic power generation system is fed into a power grid through the incoming line cabinet; a third internet access rule corresponding to the third working state: residual electricity of the waste heat power generation system is fed into the power grid through the subsection cabinet and the inlet cabinet, and residual electricity of the photovoltaic power generation system is fed into the power grid through the inlet cabinet; a fourth internet access rule corresponding to the fourth operating state: and the residual electricity of the photovoltaic power generation system is fed into the power grid through the incoming line cabinet.
Optionally, the determining, according to the internet access rule, a bidirectional metering electric meter for acquiring internet access electric quantity data includes: determining a bidirectional metering ammeter for acquiring internet surfing electric quantity data according to a first internet surfing rule as follows: the bidirectional metering electric meters are connected in series with the front end of the sectional cabinet and connected in series with the grid-connected access point; determining a bidirectional metering ammeter for acquiring the internet surfing electric quantity data according to the second internet surfing rule as follows: the bidirectional metering ammeter is connected in series with the front end of the photovoltaic power generation grid-connected cabinet and the bidirectional metering ammeter is connected in series with the grid-connected access point; determining a bidirectional metering ammeter used for acquiring the internet surfing electric quantity data according to a third internet surfing rule as follows: the system comprises bidirectional metering ammeters connected in series at the front end of a sectional cabinet, bidirectional metering ammeters connected in series at the front end of a photovoltaic power generation grid-connected cabinet and bidirectional metering ammeters connected in series at a grid-connected access point; determining a bidirectional metering ammeter for acquiring the internet surfing electric quantity data according to a fourth internet surfing rule as follows: the system comprises bidirectional metering electric meters connected in series at the front end of a photovoltaic power generation grid-connected cabinet and bidirectional metering electric meters connected in series at a grid-connected access point.
Optionally, the obtaining of the internet surfing electric quantity data through the determined bidirectional metering electric meter includes: the online electric quantity data of the surplus electricity heating system is obtained through the metering value of the bidirectional metering electric meter connected in series at the front end of the sectional cabinet; and obtaining the online electric quantity data of the photovoltaic power generation system through the absolute value of the difference between the metering value of the bidirectional metering electric meter connected in series with the grid-connected access point and the metering value of the bidirectional metering electric meter connected in series with the front end of the sectional cabinet.
In another aspect, the present invention provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to perform the above-mentioned method for metering grid-connected pv in a cement plant.
By the technical scheme, the independent waste heat power generation grid-connected unit and the independent photovoltaic power generation grid-connected unit are constructed, so that the stable grid connection of the waste heat power generation system and the photovoltaic power generation system in various working states is adapted. And through the combined bidirectional metering ammeter, the waste heat power generation system power-on electric quantity and the photovoltaic power generation power-on electric quantity can be orderly distinguished no matter under which working state, and the intelligent management of the generated energy of a cement plant with a photovoltaic power generation system is realized.
Additional features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a system configuration diagram of a photovoltaic grid-connected system of a cement plant according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a grid-connected photovoltaic metering method for a cement plant according to an embodiment of the present invention.
Description of the reference numerals
10-photovoltaic power generation grid-connected unit; 20-a waste heat power generation grid-connected unit; 30-a wire inlet cabinet;
40-PJ1；50-PJ2；60-PJ3；70-PJ4；
101-a sectional cabinet; 102-a photovoltaic power generation grid-connected cabinet; 103-photovoltaic voltage transformer cabinets;
201-an outlet cabinet; 202-a waste heat voltage transformer cabinet; 203-waste heat power generation grid-connected cabinet.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a system configuration diagram of a photovoltaic grid-connected system of a cement plant according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides a photovoltaic grid-connected system for a cement plant, which is applied to combined grid-connected control of a waste heat power generation system and a photovoltaic power generation system of the cement plant, and the system includes: the system comprises a waste heat power generation grid-connected unit 20 and a photovoltaic power generation grid-connected unit 10; wherein: the photovoltaic power generation grid-connected unit 10 comprises a sectional cabinet 101, a photovoltaic power generation grid-connected cabinet 102 and a photovoltaic voltage transformer cabinet 103 which are connected in parallel; the waste heat power generation grid-connected unit 20 is connected to the photovoltaic power generation grid-connected unit 10 through the sectional cabinet 101, and the photovoltaic power generation grid-connected unit 10 is connected to a power grid through a grid-connected access point; the grid-connected access point, the subsection cabinet 101 and the photovoltaic power generation grid-connected cabinet 102 are all connected with a bidirectional metering ammeter in series.
In the embodiment of the invention, the environmental protection concept is already integrated into the aspects of production and life, and in the traditional manufacturing industry, the improvement of the capacity is the most important direction in the past. However, in the current excellent manufacturing industry, evaluation is performed only by production energy, and the input-output ratio, the energy utilization rate and the like are important judgment standards. Therefore, how to reduce the cost and improve the energy utilization efficiency on the premise of ensuring the energy production is a problem to be considered by the contemporary manufacturing industry. In the cement manufacturing industry, since there are many high-temperature works, it is preferable to provide a waste heat power generation system in order to avoid waste of temperature after the work and to improve energy use efficiency. The waste heat power generation system just utilizes the waste heat after high-temperature operation to generate power and recover the heat of the system, so that the energy can be utilized secondarily. Because the waste heat is limited and the power demand of a plant area is very large, most of the waste heat power generation systems are self-generation self-use systems, namely, the generated energy of the waste heat power generation systems is directly used in the plant area, and the waste heat power generation systems are used for getting power through a power grid when the power supply is insufficient. And if the generated energy of the waste heat power generation system is large and the power plant can not be timely consumed, the electric quantity can be uploaded to a commercial power grid through a grid-connected point, and the electricity selling and recycling cost is carried out through surfing the Internet. The cement plant area is often wide in area, and the roof of the plant area is also very large, so that the cement plant area is a good construction candidate for both the photovoltaic on the lower ground and the photovoltaic on the roof. Many factories start building photovoltaic power plants on vacant grounds or roofs in order to further recover costs. The power plant with the waste heat power generation system and the photovoltaic power generation system cannot timely consume the generated energy in the power plant, so that the system usually needs to adopt a mode of self-generation and internet surfing with the waste electricity. In the mode, generated energy in the plant area is preferentially supplied to the work area for use, and the used residual electric quantity is directly uploaded to a commercial power grid through a grid-connected point.
In order to accurately measure the generated energy in a plant and ensure the orderly control of a grid-connected point, the waste heat power generation system and the photovoltaic power generation system are connected to the grid through only one grid-connected point. And reasonable connection rules need to be designed at the front end of the grid-connected point so as to accurately measure the grid-connected electric quantity of the waste heat power generation system and the photovoltaic power generation system.
The photovoltaic grid-connected system of the cement plant is applied to combined grid-connected control of a waste heat power generation system and a photovoltaic power generation system of the cement plant, and comprises a waste heat power generation grid-connected unit 20 and a photovoltaic power generation grid-connected unit 10; the waste heat power generation grid-connected unit 20 comprises an outlet cabinet 201, a residual electricity voltage transformer cabinet and a residual electricity power generation grid-connected cabinet. When the waste heat power generation system has surplus electric quantity, the surplus electric quantity is transmitted to a mains supply power grid through a surplus power generation grid-connected cabinet. Therefore, a bidirectional metering ammeter is connected in series at the front end of the residual electricity generation grid-connected cabinet. The bidirectional metering electric energy meter can simultaneously meter the electricity consumption and the generated energy, and both the power and the electric energy have directionality. From the point of view of electricity consumption, electricity consumption is calculated as positive power or positive electric energy, and electricity generation is calculated as negative power or negative electric energy. The bidirectional electric meter can realize forward and backward separated metering, separated storage and separated display of electric energy, and meanwhile, the electric meter is provided with a standard RS485 communication interface to realize remote transmission of data. Therefore, the forward counting of the bidirectional metering electric meter represents the electric quantity obtained from the commercial power grid in a factory, and the reverse counting of the bidirectional metering electric meter represents the residual electric quantity on the internet. Based on this, can directly acquire traditional waste heat power generation system's online electric quantity. Therefore, when a grid-connected unit of the photovoltaic power generation system is constructed, three 10Kv medium-voltage cabinets which are a sectional cabinet 101, a photovoltaic power generation grid-connected cabinet 102 and a photovoltaic voltage transformer cabinet 103 can be arranged; the segmented cabinet 101 is connected in series with the cogeneration grid-connected unit 20, and the original bidirectional metering electric meter is kept on the series circuit of the two units, namely PJ 250. A bidirectional metering electric meter is connected in series at the front end of the segment cabinet 101, the metering electric meter can directly obtain the internet electric quantity of the waste heat power generation system, and the bidirectional metering electric meter is set as PJ 470. The rear end of the photovoltaic power generation grid-connected cabinet 102 is directly connected with a photovoltaic system, then a bidirectional metering ammeter is connected in series with the front end of the photovoltaic power generation grid-connected cabinet 102, and the bidirectional metering ammeter is mainly used for measuring the electric quantity uploaded by the photovoltaic power generation grid-connected cabinet 102. The bidirectional metering meter device PJ 360. And the photovoltaic voltage transformer cabinet 103 and the residual electricity voltage transformer cabinet are respectively used for measuring voltage signals in a photovoltaic power generation system circuit and a residual electricity power generation system circuit. Finally, a main bidirectional metering electric meter is connected in series between the outlet end of the photovoltaic power generation grid-connected unit 10 and a grid-connected point, the bidirectional metering electric meter can directly obtain the total electric quantity of the on-line, the total electric quantity is marked as PJ 140, and an inlet cabinet 30 is connected between the main bidirectional metering electric meter and the grid-connected point.
Preferably, the sectional cabinet 101, the photovoltaic power generation grid-connected cabinet 102 and the photovoltaic voltage transformer cabinet 103 are all 10kV medium-voltage cabinets.
Fig. 2 is a flowchart of a method for metering grid-connected photovoltaic power generation of a cement plant according to an embodiment of the present invention. As shown in fig. 2, an embodiment of the present invention provides a grid-connected photovoltaic metering method for a cement plant, where the method includes:
step S10: and acquiring the working state information of the waste heat power generation system and the photovoltaic power generation system.
Step S20: and comparing preset rules according to the working state information to determine the internet surfing rules of the waste heat power generation system and the photovoltaic power generation system.
Step S30: and determining the serial number of the bidirectional metering electric meter according to the internet surfing rule.
Step S40: and acquiring the data of the internet surfing electric quantity through the corresponding electric meter according to the serial number of the metering electric meter.
Preferably, the operating status information includes: and current signal information and voltage signal information of the waste heat power generation system and the photovoltaic power generation system.
In the embodiment of the present invention, the metering rule of the bidirectional metering electric meter is mainly to calculate the forward or reverse electric power to calculate the final electric quantity. Therefore, when the bidirectional electric meter is used for measuring electric quantity, the voltage signal and the current signal in the circuit are required to be used for calculating electric power. Therefore, in order to accurately measure the electric quantity of the bidirectional metering electric meter, a rated current signal and a rated voltage signal in a circuit need to be acquired. The signals of each bidirectional metering electric meter are independently collected, the current signal of the PJ 250 is collected through a current transformer of the waste heat power generation grid-connected cabinet 203, and the voltage signal is collected through the waste heat voltage transformer cabinet 202. The current signal of the PJ470 is collected through a current transformer of the sectional cabinet, and the voltage signal is collected through a photovoltaic voltage transformer cabinet 103. Current signals of the PJ 360 are collected through a current transformer of the photovoltaic power generation grid-connected cabinet 102, and voltage signals are collected through a photovoltaic voltage transformer cabinet 103. The current signal of the PJ 140 is collected by the current transformer of the incoming line cabinet 30, and the voltage signal is collected by the photovoltaic voltage transformer cabinet 103.
Preferably, the waste heat power generation system and the photovoltaic power generation system both adopt a grid-connected mode of self-generation and self-use and internet surfing of waste electricity.
Preferably, the preset rule includes the following working states:
a first working state: only the waste heat power generation system operates, and the waste heat power generation system needs to be on line with the surplus power;
the second working state: only the photovoltaic power generation system operates, and the photovoltaic power generation system needs to be on line with surplus electricity;
the third working state: the waste heat power generation system and the photovoltaic power generation system run simultaneously, and the waste heat power generation system and the photovoltaic power generation system have waste electricity and need to be connected to the Internet;
a fourth operating state: the waste heat power generation system and the photovoltaic power generation system run simultaneously, the photovoltaic power generation system needs to be on line with the surplus power, and the waste heat power generation system needs to get power through a power grid.
In the embodiment of the invention, various power utilization and internet surfing rules exist in a factory area comprising two power generation systems. Preferably, the power generation amount of the waste heat power generation system used by the plant area is set to be preferentially, because the waste heat power generation system and the original equipment in the plant area are in a co-connection relationship, the photovoltaic system is an independent system, the construction range of the photovoltaic system is wide, and the waste heat power generation system is more suitable for the use rule nearby. Under such rules, therefore, there are a number of operating conditions, including:
the first working state:
in the night state, the photovoltaic system is in a non-operating state because there is no solar power for generating electricity. In this case, if surplus electric quantity exists after the power generation amount of the waste heat power generation system is used in the plant area, the surplus power generated by the waste heat power generation system is uploaded to the commercial power grid through the sectional cabinet 101 and the incoming line cabinet 30.
The second working state:
in a plant maintenance or shutdown state, the waste heat power generation system is in a non-working state because the waste heat of the system does not exist. In the plant area, only the photovoltaic power generation system generates power, and in this case, the residual power of the photovoltaic power generation system is uploaded to the commercial power grid through the incoming line cabinet 30.
The third working state:
if the waste heat power generation system and the photovoltaic power generation system operate simultaneously and both have residual electricity to be connected to the internet, the waste heat power generation system uploads the residual electricity to the commercial power grid through the sectional cabinet 101 and the incoming line cabinet 30. The photovoltaic power generation system uploads the residual electricity to the commercial power grid through the incoming line cabinet 30.
A fourth operating state:
if the waste heat power generation system and the photovoltaic power generation system operate simultaneously, but the generated energy of the waste heat power generation system is used by a factory, namely the waste heat power generation system does not have the surplus power and needs to be on line. And the surplus electricity of the photovoltaic power generation system needs to be on the internet, and the surplus electricity of the photovoltaic power generation system is uploaded through the incoming line cabinet 30.
Preferably, the preset rules further include internet surfing rules corresponding to the working states one to one:
a first internet access rule corresponding to the first working state: the residual electricity of the waste heat power generation system is fed into the power grid through the sectional cabinet 101 and the inlet cabinet 30;
a second internet access rule corresponding to the second working state: the residual electricity of the photovoltaic power generation system is fed into the power grid through the incoming line cabinet 30;
a third internet access rule corresponding to the third working state: residual electricity of the waste heat power generation system is fed into the power grid through the sectional cabinet 101 and the inlet cabinet, and residual electricity of the photovoltaic power generation system is fed into the power grid through the inlet cabinet 30;
a fourth internet access rule corresponding to the fourth operating state: the residual electricity of the photovoltaic power generation system is fed into the power grid through the inlet wire cabinet 30.
Preferably, the determining, according to the internet access rule, a bidirectional metering electric meter for acquiring internet access electric quantity data includes:
determining a bidirectional metering ammeter used for acquiring the internet surfing electric quantity data according to the first internet surfing rule as follows:
the bidirectional metering electric meters are connected in series with the front end of the sectional cabinet and connected in series with the grid-connected access point;
determining a bidirectional metering ammeter for acquiring the internet surfing electric quantity data according to the second internet surfing rule as follows:
the bidirectional metering ammeter is connected in series with the front end of the photovoltaic power generation grid-connected cabinet 102 and the bidirectional metering ammeter is connected in series with the grid-connected access point;
determining a bidirectional metering ammeter used for acquiring the internet surfing electric quantity data according to a third internet surfing rule as follows:
the system comprises two-way metering ammeters connected in series at the front end of a sectional cabinet, two-way metering ammeters connected in series at the front end of a photovoltaic power generation grid-connected cabinet 102 and two-way metering ammeters connected in series at a grid-connected access point;
determining a bidirectional metering ammeter used for acquiring the internet surfing electric quantity data according to a fourth internet surfing rule as follows:
the system comprises a bidirectional metering ammeter connected in series at the front end of the photovoltaic power generation grid-connected cabinet 102 and a bidirectional metering ammeter connected in series at a grid-connected access point.
In the embodiment of the present invention, if the first internet access rule is satisfied, the surplus power of the cogeneration system is fed into the power grid through the segment cabinet 101 and the incoming line cabinet 30, reverse metering is correspondingly performed through the PJ470 and the PJ 140, and the uploaded power amount data is obtained according to the metering data.
If the second internet access rule is satisfied, the residual electricity of the photovoltaic power generation system is fed into the power grid through the incoming line cabinet 30, reverse metering is correspondingly performed on the PJ 360 and the PJ 140, and the uploaded electric quantity data is acquired according to the metering data.
If the rule is a third internet surfing rule, the residual electricity of the waste heat power generation system is fed into the power grid through the subsection cabinet 101 and the incoming line cabinet 30, and the residual electricity of the photovoltaic power generation system is fed into the power grid through the incoming line cabinet 30, reverse metering needs to be carried out correspondingly through the PJ470, the PJ 360 and the PJ 140, and electric quantity data are uploaded in the past according to metering data.
If the rule is a fourth internet surfing rule, the surplus electricity of the photovoltaic power generation system is fed into the power grid through the incoming line cabinet 30, reverse metering is correspondingly needed to be performed on the PJ 360 and the PJ 140, and the uploaded electricity quantity data are obtained according to the metering data.
Preferably, the obtaining of the internet surfing electric quantity data through the corresponding electric meter according to the metering electric meter serial number comprises: the on-line electric quantity of the residual electricity heating system is directly measured and obtained by a bidirectional measuring ammeter at the front end of the sectional cabinet; the grid-connected electric quantity of the photovoltaic power generation system is the absolute value of the difference between the metering value of the grid-connected access point bidirectional metering electric meter and the metering value of the bidirectional metering electric meter at the front end of the sectional cabinet.
In the embodiment of the invention, when the residual electricity of the waste heat power generation system is uploaded, the path is the waste heat power generation grid-connected cabinet 203-the sectional cabinet 101-the incoming line cabinet 30, and when the residual electricity of the photovoltaic power generation system is uploaded, the path is the photovoltaic power generation grid-connected cabinet 102-the incoming line cabinet 30. Therefore, in the first internet access rule, the power transmission amount of the cogeneration system is directly read by the PJ 140 or the PJ 470. In the second internet surfing rule, the electric quantity uploaded by the photovoltaic power generation system is directly read and acquired by the PJ 140 or the PJ 360. In the third internet access rule, the electric quantity uploaded by the waste heat power generation system is directly read by the PJ 140, and the photovoltaic power generation system is directly read by the PJ 360 or obtained by subtracting the reading of the PJ470 from the reading of the PJ 140. In the fourth internet surfing rule, the electric quantity uploaded by the photovoltaic power generation system is directly read and acquired by the PJ 140 or the PJ 360.
The embodiment of the invention also provides a computer-readable storage medium, wherein the computer-readable storage medium is stored with instructions, and when the instructions are executed on a computer, the computer is enabled to execute the photovoltaic grid-connected metering method of the cement plant.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications are within the scope of the embodiments of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
In addition, any combination of various embodiments of the present invention may be made, and the same should be considered as what is disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.
Claims (6)
1. A photovoltaic grid-connected metering method of a cement plant is applied to a cement plant waste heat power generation system and a photovoltaic grid-connected system of the cement plant which is controlled by the combination of the photovoltaic power generation system and the waste heat power generation system of the cement plant in a grid-connected mode, and the system comprises the following components: the system comprises a waste heat power generation grid-connected unit and a photovoltaic power generation grid-connected unit; the photovoltaic power generation grid-connected unit comprises: the photovoltaic voltage transformer cabinet is connected with the photovoltaic power generation grid-connected cabinet; the waste heat power generation grid-connected unit is connected to the photovoltaic power generation grid-connected unit through the sectional cabinet, and the photovoltaic power generation grid-connected unit is connected to a power grid through a grid-connected access point; the grid-connected access point, the segmentation cabinet and the photovoltaic power generation grid-connected cabinet are all connected with a bidirectional metering ammeter in series; characterized in that the method comprises:
acquiring working state information of a waste heat power generation system and working state information of a photovoltaic power generation system;
determining the internet surfing rules of the waste heat power generation system and the photovoltaic power generation system based on a preset rule according to the working state information of the waste heat power generation system and the working state information of the photovoltaic power generation system; wherein, the first and the second end of the pipe are connected with each other,
the preset rules comprise the following working states:
the first working state:
only the waste heat power generation system runs, and the waste heat power generation system needs to be on the internet when having waste electricity;
a second working state:
only the photovoltaic power generation system operates, and the photovoltaic power generation system needs to be on line with surplus power;
the third working state:
the waste heat power generation system and the photovoltaic power generation system run simultaneously, and the waste heat power generation system and the photovoltaic power generation system have waste electricity and need to be connected to the Internet;
a fourth operating state:
the waste heat power generation system and the photovoltaic power generation system run simultaneously, the photovoltaic power generation system needs to be on line with the waste heat power, and the waste heat power generation system needs to get electricity through a power grid;
the preset rules further comprise internet surfing rules which correspond to the working states one by one:
a first internet access rule corresponding to the first working state:
residual electricity of the waste heat power generation system is fed into a power grid through the sectional cabinet and the incoming line cabinet;
a second internet access rule corresponding to the second working state:
residual electricity of the photovoltaic power generation system is fed into a power grid through the incoming line cabinet;
a third internet access rule corresponding to the third working state:
residual electricity of the waste heat power generation system is fed into the power grid through the subsection cabinet and the inlet cabinet, and residual electricity of the photovoltaic power generation system is fed into the power grid through the inlet cabinet;
a fourth internet access rule corresponding to the fourth operating state:
residual electricity of the photovoltaic power generation system is fed into a power grid through the incoming line cabinet;
determining a bidirectional metering ammeter for acquiring internet surfing electric quantity data according to the internet surfing rules;
and acquiring the data of the internet surfing electric quantity through the determined bidirectional metering electric meter.
2. The method of claim 1, wherein the operating state information comprises:
current signal information and voltage signal information.
3. The method according to claim 1, wherein the waste heat power generation system and the photovoltaic power generation system both adopt a grid-connected mode of spontaneous self-use and waste electricity online.
4. The method of claim 1, wherein determining a bidirectional electricity meter for obtaining the internet power data according to the internet access rule comprises:
determining a bidirectional metering ammeter for acquiring internet surfing electric quantity data according to a first internet surfing rule as follows:
the bidirectional metering electric meters are connected in series with the front end of the sectional cabinet and connected in series with the grid-connected access point;
determining a bidirectional metering ammeter used for acquiring the internet surfing electric quantity data according to the second internet surfing rule as follows:
the system comprises a bidirectional metering ammeter and a bidirectional metering ammeter, wherein the bidirectional metering ammeter is connected in series with the front end of a photovoltaic power generation grid-connected cabinet, and the bidirectional metering ammeter is connected in series with a grid-connected access point;
determining a bidirectional metering ammeter for acquiring the internet surfing electric quantity data according to a third internet surfing rule as follows:
the system comprises bidirectional metering ammeters connected in series at the front end of a sectional cabinet, bidirectional metering ammeters connected in series at the front end of a photovoltaic power generation grid-connected cabinet and bidirectional metering ammeters connected in series at a grid-connected access point;
determining a bidirectional metering ammeter for acquiring the internet surfing electric quantity data according to a fourth internet surfing rule as follows:
the system comprises bidirectional metering electric meters connected in series at the front end of a photovoltaic power generation grid-connected cabinet and bidirectional metering electric meters connected in series at a grid-connected access point.
5. The method of claim 4, wherein the obtaining the internet power data through the determined bidirectional electricity meter comprises:
the online electric quantity data of the surplus electricity heating system is obtained through the metering value of the bidirectional metering electric meter connected in series at the front end of the sectional cabinet;
and obtaining the online electric quantity data of the photovoltaic power generation system through the absolute value of the difference between the metering value of the bidirectional metering electric meter connected in series with the grid-connected access point and the metering value of the bidirectional metering electric meter connected in series with the front end of the sectional cabinet.
6. A computer readable storage medium having instructions stored thereon, which when executed on a computer, cause the computer to perform the grid-tied photovoltaic metering method for a cement plant according to any one of claims 1 to 5.
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