Off-grid offshore photovoltaic project assembly generating capacity monitoring and model selection method

Abstract

The invention provides an off-grid offshore photovoltaic project module generating capacity monitoring and model selection method. The method comprises the following steps: respectively connecting various types of photovoltaic modules into a generating capacity monitoring system; monitoring the generating capacity of each type of photovoltaic module in a set period; according to a monitoring result, calculating the total generating capacity of each type of photovoltaic module in a set period; on the basis of the total generating capacity of the single assembly in the set period, combining the number of the photovoltaic assemblies of the corresponding type, the assembly size and the comparable investment, and calculating the generating capacity investment of the target offshore photovoltaic project adopting different photovoltaic assembly units; and according to the power generation investment, sorting the various types of photovoltaic modules, and taking a plurality of photovoltaic modules of which the power generation investment is smaller than a set value as photovoltaic modules to be selected. According to the invention, the advantages and disadvantages of different types of photovoltaic modules in offshore photovoltaic project development can be objectively judged.

Description

Technical Field

[0001] The present invention belongs to the field of off-grid offshore photovoltaics, and in particular relates to a method for monitoring and selecting power generation of components in an off-grid offshore photovoltaic project. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] As the available area of ​​​​onshore photovoltaic power generation is decreasing, the development and utilization of offshore photovoltaic resources has become an important development trend. However, offshore photovoltaic power generation is far from the shore, the offshore environment is complex, with high salt fog and high humidity, and is affected by wind, waves, currents, ice and other environmental factors. Photovoltaic modules are in a shaking state for a long time, and it is necessary to select better photovoltaic modules to adapt to the offshore project environment. At the same time, there are many types of photovoltaic modules, including P-type photovoltaic modules, N-type photovoltaic modules, heterojunction photovoltaic modules and BC photovoltaic modules. How to select the corresponding photovoltaic modules according to different project conditions is also a difficult problem that needs to be solved. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a method for monitoring and selecting power generation of off-grid offshore photovoltaic project components. On the one hand, the present invention monitors the power generation of different types of off-grid offshore photovoltaic components to ensure the safe operation of photovoltaic components. On the other hand, based on the power generation of different types of components, the investment in offshore photovoltaic projects is calculated. Based on the calculated investment cost, the advantages and disadvantages of different types of photovoltaic components in the development of offshore photovoltaic projects are objectively judged.

[0005] According to some embodiments, the present invention adopts the following technical solutions:

[0006] A method for monitoring and selecting power generation of off-grid offshore photovoltaic project components, comprising the following steps:

[0007] Connect each type of photovoltaic module to the power generation monitoring system;

[0008] Monitor the power generation of each type of photovoltaic module within a set period;

[0009] Based on the monitoring results, the total power generation of each type of photovoltaic module within a set period is calculated;

[0010] Based on the total power generation of the above-mentioned single components within a set period, combined with the number of corresponding types of photovoltaic modules, module size and comparable investment, calculate the power generation investment of different photovoltaic module units used in the target offshore photovoltaic project;

[0011] According to the power generation investment, various types of photovoltaic modules are sorted, and a number of photovoltaic modules with power generation investment less than a set value are selected as photovoltaic modules.

[0012] As an optional implementation, the set period is one year or an integer number of years.

[0013] To cover the impact of different seasons and environmental factors (such as light, temperature, etc.) on power generation and ensure the accuracy of monitoring results.

[0014] As an optional implementation, the power generation monitoring system includes a photovoltaic component, an inverter and energy storage unit, an intelligent control unit, an energy consuming device and a power monitoring unit, wherein the photovoltaic component is connected to the inverter and energy storage unit, the inverter and energy storage unit is used to store the power generated by the photovoltaic component and convert direct current into alternating current to supply the energy consuming device, the intelligent control unit is used to control the energy consuming device to work or stop according to the power status of the energy storage device, and the power monitoring unit is used to monitor the cumulative power usage of the energy consuming device.

[0015] As an optional implementation, each type of photovoltaic module includes a plurality of photovoltaic modules of the same type, and each photovoltaic module is cascaded.

[0016] As a further step, when the photovoltaic module is generating electricity, the energy storage device is in floating charge operation and the energy consumption device is in operation.

[0017] As a further step, when the photovoltaic module is in a non-power generation state and the amount of electricity in the energy storage device is greater than a set value, the energy consumption device operates;

[0018] When the photovoltaic assembly is in a non-power generation state and the power in the energy storage device reaches the minimum power setting value, the intelligent control unit controls the energy consumption device to stop working.

[0019] As an optional implementation, the monitoring result includes the cumulative power usage of the energy-consuming device monitored by the power monitoring unit, and the remaining power in the energy storage device.

[0020] As an optional implementation, the process of calculating the total power generation of each type of photovoltaic module within a set period according to the monitoring results includes:

[0021] W i =W i1 +W i2 ;

[0022] EW i =W i / N i ;

[0023] Where W i N i Annual power generation of type i module; W i1 N i The power generation of the block i type component electricity metering; W i2The energy storage capacity in the power monitoring system of type i components; EW i is the annual power generation of a single type i component; N i is the number of components of type i.

[0024] As an optional implementation, the process of calculating the power generation investment of the target offshore photovoltaic project using different photovoltaic module units includes:

[0025] I i =P×a i +(P / P i )×b+(P / P i )×B×L×c+I t ;

[0026] Among them, I i is the project investment of type i components, RMB; P is the DC side capacity of the project, Wp; a i is the price per unit power of type i photovoltaic modules, RMB / Wp; P i is the power of a single photovoltaic module, Wp; b is the installation price of a single module, which is basically independent of the module type, RMB / unit; B is the width of a single module, m; L is the length of a single module, m; c is the infrastructure and construction investment per unit area, which is independent of the module type, RMB / m 2 ;I t Investment in other parts of the offshore PV field, regardless of the type of module, is RMB.

[0027] As a further step, the unit power generation investment of different types of photovoltaic modules is calculated as:

[0028] EI i =I i / (EW i ×P / P i ) / 1000;

[0029] Where, EI i is the unit power generation investment of type i photovoltaic modules, RMB / kWp·h.

[0030] An off-grid offshore photovoltaic project module power generation monitoring and selection system, comprising:

[0031] The power generation monitoring system is connected to each type of photovoltaic module and monitors the power generation of each type of photovoltaic module within a set period;

[0032] The power generation calculation module is used to calculate the total power generation of each type of photovoltaic module within a set period based on the monitoring results;

[0033] An investment calculation module is used to calculate the power generation investment of the target offshore photovoltaic project using different photovoltaic module units based on the total power generation of the above-mentioned single module within a set period, combined with the number of photovoltaic modules of corresponding types, module size and comparable investment;

[0034] The selection module is used to sort the photovoltaic modules of various types according to the power generation investment, and select several photovoltaic modules with power generation investment less than a set value as photovoltaic modules to be selected.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention can quickly and objectively evaluate the power generation levels of different components in an offshore environment and the economic level of offshore photovoltaic project construction, providing support for project construction.

[0037] The present invention effectively solves the problem of monitoring the power generation of off-grid photovoltaic project components, provides a monitoring method for the suitability evaluation test of photovoltaic components under harsh environmental conditions such as offshore photovoltaics, and can objectively measure the power generation levels of different types of components under the same environmental conditions.

[0038] The present invention adopts a kilowatt-hour investment analysis method for different types of components to accurately and objectively evaluate the economic feasibility of selecting different types of components, so as to objectively judge the advantages and disadvantages of different types of photovoltaic components in the development of offshore photovoltaic projects.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0041] Figure 1 The present invention is a schematic diagram of a power generation monitoring system according to an embodiment.

[0042] Among them, 1 is a photovoltaic module; 2 is an inverter for converting direct current into alternating current; 3 is an energy storage device for temporarily storing the electricity generated by the photovoltaic module and supplying it to energy-consuming devices; 4 is an intelligent controller for remotely controlling the start and stop of the AC distribution box; 5 is an AC distribution box for switching on and off energy-consuming devices; 6 is an electricity metering unit for measuring the accumulated electricity consumption of energy-consuming devices; 7 is an energy-consuming device for consuming the electricity generated by photovoltaic modules. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0046] In the absence of conflict, the embodiments in this application and the features in the embodiments may be combined with each other.

[0047] Embodiment 1

[0048] A method for monitoring and selecting power generation of off-grid offshore photovoltaic project components is proposed to monitor the power generation of different types of off-grid offshore photovoltaic components. Based on the power generation of different types of components, a method for calculating the per-kilowatt-hour investment of offshore photovoltaic projects is proposed to objectively judge the advantages and disadvantages of different types of photovoltaic components in the development of offshore photovoltaic projects.

[0049] This embodiment includes two parts: off-grid power monitoring and power calculation of offshore photovoltaic modules and investment analysis of different types of modules used in offshore photovoltaic projects.

[0050] Among them, the monitoring and calculation of off-grid electricity consumption of photovoltaic modules at sea is mainly to objectively measure the power generation level of different types of modules under the same environmental conditions. The investment analysis of different types of modules for offshore photovoltaic projects is used to accurately and objectively evaluate the economic feasibility of selecting different types of modules.

[0051] The following are introduced separately:

[0052] The first is the off-grid power monitoring and power calculation of photovoltaic modules at sea.

[0053] Use Figure 1 The power generation monitoring system shown includes a photovoltaic module, an inverter and energy storage unit, an intelligent control unit, an energy consumption device and an electricity metering unit, wherein the photovoltaic module is various types of photovoltaic modules to be selected; the inverter and energy storage unit is used to store the power generation of the photovoltaic module and convert direct current into alternating current for use by the energy consumption device;

[0054] Intelligent control unit, which can be selected as intelligent controller, is used to control the power of energy consumption system according to the power situation in the energy storage system;

[0055] The energy consumption system and the intelligent control unit are connected through an AC distribution box, which is used to dissipate the power generated by the photovoltaic modules to avoid excessive power in the energy storage system, which makes it impossible to store the power generated by the photovoltaic modules.

[0056] The electricity metering unit is used to monitor the cumulative electricity usage of energy-consuming devices.

[0057] like Figure 1 As shown, the inverter and energy storage unit includes an inverter and an energy storage device, wherein the inverter has two DC inputs, one is the DC input of the component string, and the other is the DC input of the energy storage device; the AC side of the inverter is connected to the energy consumption device.

[0058] The operation mode of the energy consumption device in this embodiment is as follows:

[0059] (1) When the components are generating electricity, the energy storage device is in floating charge operation and the energy consumption device is in operation.

[0060] (2) When the component is in a non-power generation state, the intelligent control unit controls the energy consumption device to work or stop according to the power status of the energy storage device. That is, when the power in the energy storage device is higher than the set minimum power setting value, the energy consumption device works. When the power in the energy storage device reaches the minimum power setting value, the energy consumption device stops working.

[0061] After one year of monitoring, the embodiment reads the accumulated power and the remaining energy storage power of the power metering unit.

[0062] Of course, other values ​​may be selected for the monitoring period in other embodiments.

[0063] The power generation of different types of components is calculated using the following formula:

[0064] W i =W i1 +W i2 ;

[0065] EW i =W i / N i ;

[0066] Among them, W i N i Annual power generation of type i module; W i1 N i The power generation of the block i type component electricity metering; W i2 The energy storage capacity in the power monitoring system of type i components; EW i is the annual power generation of a single type i component; N i To monitor the number of type i components.

[0067] In order to accurately compare and evaluate the applicability of different types of components in marine environments with different temperatures, lighting characteristics, etc., the monitoring period is generally 1 year or an integer number of years, and the above formula is calculated based on 1 year.

[0068] The second step is the analysis and selection of different components.

[0069] The main investments in offshore photovoltaic projects include the purchase and installation fees of photovoltaic modules related to the module type, the infrastructure and construction costs related to the area required for module installation, and other equipment and construction costs such as inverters, box transformers, cables, etc. that are not related to the modules.

[0070] Based on the annual power generation of different modules, combined with the number of modules, module size and comparable investment, the unit power generation investment of different types of photovoltaic modules in an offshore photovoltaic project can be calculated. The relevant calculation formula is as follows:

[0071] I i =P×a i +(P / P i )×b+(P / P i )×B×L×c+I t ;

[0072] In the formula, I i is the project investment of type i components, RMB; P is the DC side capacity of the project, Wp; a i is the price per unit power of type i photovoltaic modules, RMB / Wp; P i is the power of a single PV module, Wp; b is the installation price of a single module, which is basically independent of the module type, RMB / unit; B is the width of a single module, m; L is the length of a single module, m; c is the infrastructure and construction investment per unit area, which is independent of the module type, RMB / m 2 ;I t The rest of the investment in offshore PV farms is independent of the module type and is RMB.

[0073] Investment per unit of power generation of different types of photovoltaic modules:

[0074] EI i =I i / (EW i ×P / P i ) / 1000;

[0075] Where, EI i is the unit power generation investment of type i photovoltaic modules, RMB / kWp·h.

[0076] By comparing the EI of different types of components i , we can objectively judge the economic feasibility of different types of components in offshore photovoltaic projects, namely EI i The lower it is, the better the economy.

[0077] Embodiment 2

[0078] A method for monitoring and selecting power generation of off-grid offshore photovoltaic project components, comprising the following steps:

[0079] Connect each type of photovoltaic module to the power generation monitoring system;

[0080] Monitor the power generation of each type of photovoltaic module within a set period;

[0081] Based on the monitoring results, calculate the total power generation of each type of photovoltaic module within a set period;

[0082] Based on the total power generation of the above-mentioned single components within a set period, combined with the number of corresponding types of photovoltaic modules, module size and comparable investment, calculate the power generation investment of different photovoltaic module units used in the target offshore photovoltaic project;

[0083] According to the power generation investment, various types of photovoltaic modules are sorted, and a number of photovoltaic modules with power generation investment less than a set value are selected as photovoltaic modules.

[0084] For details of each step, please refer to Example 1.

[0085] Embodiment 3

[0086] An off-grid offshore photovoltaic project module power generation monitoring and selection system, comprising:

[0087] The power generation monitoring system is connected to each type of photovoltaic module and monitors the power generation of each type of photovoltaic module within a set period;

[0088] The power generation calculation module is used to calculate the total power generation of each type of photovoltaic module within a set period based on the monitoring results;

[0089] An investment calculation module is used to calculate the power generation investment of the target offshore photovoltaic project using different photovoltaic module units based on the total power generation of the above-mentioned single module within a set period, combined with the number of photovoltaic modules of corresponding types, module size and comparable investment;

[0090] The selection module is used to sort the photovoltaic modules of various types according to the power generation investment, and select several photovoltaic modules with power generation investment less than a set value as photovoltaic modules to be selected.

[0091] It can be understood that the above-mentioned units / modules can be separately or completely combined into one or several other units / modules, or one (some) of the units can be further divided into multiple functionally smaller units, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application.

[0092] The above modules of the system are divided based on logical functions. In practical applications, the function of one module can also be implemented by multiple modules, or the functions of multiple modules can be implemented by one module.

[0093] Similarly, in other embodiments of the present application, the system may also include other units / modules. In actual applications, these functions may also be implemented with the assistance of other units, and may be implemented by collaboration of multiple units.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention without creative labor shall be included in the protection scope of the present invention.

Claims

1. A method for monitoring and selecting power generation of off-grid offshore photovoltaic project components, characterized in that: The following steps are involved: Connect each type of photovoltaic module to the power generation monitoring system; Monitor the power generation of each type of photovoltaic module within a set period; Based on the monitoring results, calculate the total power generation of each type of photovoltaic module within a set period; Based on the total power generation of the above-mentioned single components within a set period, combined with the number of corresponding types of photovoltaic modules, module size and comparable investment, calculate the power generation investment of different photovoltaic module units used in the target offshore photovoltaic project; According to the power generation investment, various types of photovoltaic modules are sorted, and a number of photovoltaic modules with power generation investment less than a set value are selected as photovoltaic modules.

2. A method for monitoring and selecting power generation of off-grid offshore photovoltaic project components as claimed in claim 1, characterized in that: The set period is one year or an integer number of years.

3. The off-grid offshore photovoltaic project module power generation monitoring and selection method according to claim 1, characterized in that: The power generation monitoring system includes a photovoltaic component, an inverter and energy storage unit, an intelligent control unit, an energy consumption device and a power monitoring unit, wherein the photovoltaic component is connected to the inverter and energy storage unit, the inverter and energy storage unit is used to store the power generated by the photovoltaic component and convert direct current into alternating current to supply the energy consumption device, the intelligent control unit is used to control the energy consumption device to work or stop according to the power status of the energy storage device, and the power monitoring unit is used to monitor the cumulative power usage of the energy consumption device.

4. A method for monitoring and selecting power generation of off-grid offshore photovoltaic project components as claimed in claim 1 or 3, characterized in that: Each type of photovoltaic module includes a plurality of photovoltaic modules of the same type, and each photovoltaic module is cascaded.

5. The off-grid offshore photovoltaic project module power generation monitoring and selection method as claimed in claim 3, characterized in that: When the photovoltaic module is generating electricity, the energy storage device is in floating charge operation and the energy consumption device is in operation; When the photovoltaic module is in a non-power-generating state and the amount of electricity in the energy storage device is greater than the set value, the energy consumption device works; When the photovoltaic assembly is in a non-power generation state and the power in the energy storage device reaches the minimum power setting value, the intelligent control unit controls the energy consumption device to stop working.

6. The off-grid offshore photovoltaic project module power generation monitoring and selection method according to claim 1, characterized in that: The monitoring result includes the accumulated power usage of the energy consuming device monitored by the power monitoring unit, and the remaining power in the energy storage device.

7. The off-grid offshore photovoltaic project module power generation monitoring and selection method according to claim 1, characterized in that: Based on the monitoring results, the process of calculating the total power generation of each type of photovoltaic module within a set period includes: IN i =In i1 +W i2 ; THAT ONE i =W i / N i ; Where W i N i Annual power generation of type i module; W i1 N i The power generation of the block i type component electricity metering; W i2 The energy storage capacity in the power monitoring system of type i components; EW i is the annual power generation of a single type i component; N i is the number of components of type i.

8. The process of calculating the power generation investment of different photovoltaic module units for the target offshore photovoltaic project includes: I i =P×a i +(P / P i )×b+(P / P i )×B×L×c+I t ; Among them, I i is the project investment of type i components, RMB; P is the DC side capacity of the project, Wp; a i is the price per unit power of type i photovoltaic modules, RMB / Wp; P i is the power of a single photovoltaic module, Wp; b is the installation price of a single module, which is basically independent of the module type, RMB / unit; B is the width of a single module, m; L is the length of a single module, m; c is the infrastructure and construction investment per unit area, which is independent of the module type, RMB / m 2 ;I t Investment in other parts of the offshore PV field, regardless of the type of module, is RMB.

9. A method for monitoring and selecting power generation of off-grid offshore photovoltaic project components as claimed in claim 8, characterized in that: The investment per unit power generation of different types of photovoltaic modules is calculated as: NO i =I i / (EW i ×P / P i ) / 1000; Where, EI i is the unit power generation investment of type i photovoltaic modules, RMB / kWp·h.

10. A system for monitoring and selecting power generation of off-grid offshore photovoltaic project components, characterized in that: include: The power generation monitoring system is connected to each type of photovoltaic module and monitors the power generation of each type of photovoltaic module within a set period; The power generation calculation module is used to calculate the total power generation of each type of photovoltaic module within a set period based on the monitoring results; An investment calculation module is used to calculate the power generation investment of the target offshore photovoltaic project using different photovoltaic module units based on the total power generation of the above-mentioned single module within a set period, combined with the number of photovoltaic modules of corresponding types, module size and comparable investment; The selection module is used to sort the photovoltaic modules of various types according to the power generation investment, and select several photovoltaic modules with power generation investment less than a set value as photovoltaic modules to be selected.

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