A photovoltaic substation for reducing carbon emissions and a control method thereof

Abstract

The embodiment of the present invention provides a photovoltaic substation and a control method thereof for reducing carbon emissions, which relates to the technical field of photovoltaic power generation, including: a lithium bromide unit, a radiator, a photovoltaic system, a fan and a ground source heat pump; the photovoltaic system includes a photovoltaic power generation unit and a transformer, a photovoltaic power generation unit and a transformer; the transformer is connected to the radiator, the lithium bromide unit, the radiator, and the ground source heat pump are connected in sequence, and water is used as an intermediate medium for heat circulation, and the fan is used to dissipate heat from the radiator. The device and control method provided by the present invention can combine the cold and hot loads of the substation with the adjustment requirements of photovoltaic power station power generation and energy storage, realize the recycling of energy, and achieve the purpose of improving system stability and reducing carbon emissions.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic system control, and in particular to a photovoltaic substation for reducing carbon emissions and a control method thereof. Background Art

[0002] Photovoltaic power generation has developed rapidly in recent years due to its green and environmentally friendly features and flexible control. However, the current step-up substations of large photovoltaic power stations are designed the same as conventional substations, and do not fully meet the needs of photovoltaic power stations to achieve low-carbon design. This is mainly manifested in: direct discharge of transformer heat and independent supply of cooling and heating needs in the main control room. In addition, the vibration of the transformer fan in the station also brings noise and other pollution.

[0003] Photovoltaic power stations are now generally required to have energy storage units, and various provinces have proposed energy storage ratio requirements ranging from 5% to 20%. If the cooling and heating loads of the substation can be combined with the regulation needs of photovoltaic power station power generation and energy storage, energy recycling can be achieved, thereby improving system stability and reducing carbon emissions. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a photovoltaic substation and a control method thereof that reduce carbon emissions, so as to combine the cooling and heating loads of the substation with the regulation needs such as power generation and energy storage of the photovoltaic power station, realize energy recycling, and achieve the purpose of improving system stability and reducing carbon emissions.

[0005] In a first aspect, an embodiment of the present invention provides a photovoltaic substation for reducing carbon emissions, comprising: a lithium bromide unit, a radiator, a photovoltaic system, a fan, and a ground source heat pump;

[0006] The photovoltaic system comprises a photovoltaic power generation unit and a transformer, wherein the photovoltaic power generation unit and the transformer;

[0007] The transformer is connected to the radiator, the lithium bromide unit, the radiator, and the ground source heat pump are connected in sequence, and water is used as an intermediate medium for heat circulation, and the fan is used to dissipate heat from the radiator.

[0008] In a second aspect, the present invention provides a photovoltaic substation control method for reducing carbon emissions using the first aspect, specifically comprising the following steps:

[0009] Obtaining an average temperature of a building and a first temperature threshold of a load demand, and determining whether the average temperature of the building is higher than the temperature threshold;

[0010] If yes, when the building needs to lower the temperature, it is determined whether the ground source heat pump has reached the maximum operating power;

[0011] If not, the output power of the lithium bromide unit is reduced.

[0012] Preferably, when the building needs to lower its temperature, after the step of determining whether the ground source heat pump has reached its maximum operating power, the method further comprises:

[0013] If yes, increase the output power of the lithium bromide unit and reduce the speed of the fan;

[0014] If not, the steps of obtaining the average temperature of the building, the first temperature threshold of the load demand, and determining whether the average temperature of the building is higher than the temperature threshold are performed.

[0015] Preferably, the method further comprises:

[0016] Acquire the temperature of the transformer insulating oil and a second threshold, and determine whether the temperature of the transformer insulating oil is higher than the second threshold;

[0017] If yes, increase the speed of the fan and / or the speed of the ground source heat pump;

[0018] If not, the fan speed is reduced.

[0019] Preferably, the method further comprises:

[0020] Obtaining the average temperature of the building, the load demand, and determining whether the temperature needs to be increased based on the average temperature;

[0021] If yes, increase the ground source heat pump and reduce the speed of the fan;

[0022] If not, the rotation speed of the ground source heat pump is reduced.

[0023] Preferably, after the step of increasing the speed of the ground source heat pump and reducing the speed of the fan, the method further comprises:

[0024] Acquire the temperature of the transformer insulating oil and a third threshold value, and determine whether the temperature of the transformer insulating oil is higher than the third threshold value;

[0025] If yes, increasing the speed of the fan and / or the speed of the ground source heat pump to compensate for the thermal imbalance;

[0026] If not, the fan speed is reduced.

[0027] The preferred output power of the lithium bromide unit is:

[0028]

[0029] P v —The real-time power generated by the photovoltaic system is;

[0030] P 12—The output power of lithium bromide unit.

[0031] The embodiments of the present invention bring the following beneficial effects: The embodiments of the present invention provide a photovoltaic substation and a control method thereof for reducing carbon emissions, including: a lithium bromide unit, a radiator, a photovoltaic system, a fan and a ground source heat pump; the photovoltaic system includes a photovoltaic power generation unit and a transformer, a photovoltaic power generation unit and a transformer; the transformer is connected to the radiator, the lithium bromide unit, the radiator, and the ground source heat pump are connected in sequence, and water is used as an intermediate medium for heat circulation, and the fan is used to dissipate heat from the radiator. The device and control method provided by the present invention can combine the cold and hot loads of the substation with the adjustment requirements of photovoltaic power station power generation and energy storage, realize the recycling of energy, and achieve the purpose of improving system stability and reducing carbon emissions.

[0032] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0033] 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

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A diagram of a photovoltaic substation device for reducing carbon emissions provided by an embodiment of the present invention;

[0036] Figure 2 A flow chart of a first photovoltaic substation control method for reducing carbon emissions provided by an embodiment of the present invention;

[0037] Figure 3 A flow chart of a second photovoltaic substation control method for reducing carbon emissions provided by an embodiment of the present invention;

[0038] Figure 4 A flow chart of a third photovoltaic substation control method for reducing carbon emissions provided by an embodiment of the present invention;

[0039] Figure 5 A flow chart of a fourth photovoltaic substation control method for reducing carbon emissions provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] At present, photovoltaic power generation has developed rapidly in recent years due to its green environmental protection and flexible control. However, the booster substation of large photovoltaic power stations is designed the same as that of conventional substations, and does not fully combine the needs of photovoltaic power stations to achieve low-carbon design. Based on this, an embodiment of the present invention provides a photovoltaic substation and a control method for reducing carbon emissions, which combines the cooling and heating loads of the substation with the adjustment needs of photovoltaic power station power generation and energy storage, realizes energy recycling, and achieves the purpose of improving system stability and reducing carbon emissions.

[0042] To facilitate understanding of this embodiment, a photovoltaic substation for reducing carbon emissions disclosed in an embodiment of the present invention is first introduced in detail.

[0043] Embodiment 1:

[0044] Embodiments of the present invention Embodiment 1 provides a photovoltaic substation for reducing carbon emissions, including: a lithium bromide unit, a radiator, a photovoltaic system, a fan, and a ground source heat pump;

[0045] The photovoltaic system comprises a photovoltaic power generation unit and a transformer, wherein the photovoltaic power generation unit and the transformer;

[0046] The transformer is connected to the radiator, the lithium bromide unit, the radiator, and the ground source heat pump are connected in sequence, and water is used as an intermediate medium for heat circulation, and the fan is used to dissipate heat from the radiator.

[0047] Embodiment 2:

[0048] like Figure 2 As shown, in summer, the building temperature is high, and the air conditioner and other equipment are in a cooling state. Using the device provided in the first embodiment, the photovoltaic control method includes the following steps:

[0049] Obtaining an average temperature of a building and a first temperature threshold of a load demand, and determining whether the average temperature of the building is higher than the temperature threshold;

[0050] If yes, when the building needs to lower the temperature, it is determined whether the ground source heat pump has reached the maximum operating power;

[0051] If not, the output power of the lithium bromide unit is reduced.

[0052] Preferably, when the building needs to lower its temperature, after the step of determining whether the ground source heat pump has reached its maximum operating power, the method further comprises:

[0053] If yes, increase the output power of the lithium bromide unit and reduce the speed of the fan;

[0054] If not, the steps of obtaining the average temperature of the building, the first temperature threshold of the load demand, and determining whether the average temperature of the building is higher than the temperature threshold are performed.

[0055] Embodiment three:

[0056] like Figure 3 As shown, the third embodiment supplements the second embodiment, and specifically includes obtaining the temperature of the transformer insulating oil and a second threshold, and determining whether the temperature of the transformer insulating oil is higher than the second threshold;

[0057] If yes, increase the speed of the fan and / or the speed of the ground source heat pump;

[0058] If not, the fan speed is reduced.

[0059] Furthermore, the third embodiment may be performed after the steps of increasing the output power of the lithium bromide unit and reducing the speed of the wind turbine in the second embodiment, and may also be used as a separate embodiment to control the photovoltaic system.

[0060] Embodiment three:

[0061] like Figure 4 As shown, in winter, the building temperature is low, and air conditioners and other equipment are in a heating state. Using the device provided in Example 1, the photovoltaic control method includes the following steps:

[0062] Obtaining the average temperature of the building, the load demand, and determining whether the temperature needs to be increased based on the average temperature;

[0063] If yes, increase the ground source heat pump and reduce the speed of the fan;

[0064] If not, the rotation speed of the ground source heat pump is reduced.

[0065] Embodiment 4:

[0066] like Figure 5 As shown, the fourth embodiment provided by the present invention supplements the third embodiment. Specifically, the steps of the fourth embodiment of the present invention include

[0067] Acquire the temperature of the transformer insulating oil and a third threshold value, and determine whether the temperature of the transformer insulating oil is higher than the third threshold value;

[0068] If yes, increasing the speed of the fan and / or the speed of the ground source heat pump to compensate for the thermal imbalance;

[0069] If not, the fan speed is reduced.

[0070] Furthermore, the steps of the embodiment of the present invention may be placed after the steps of increasing the rotation speed of the ground source heat pump and reducing the rotation speed of the fan in the third embodiment, and the photovoltaic system may also be controlled separately.

[0071] It should be noted that in the first to fourth embodiments provided by the present invention, the output power of the lithium bromide unit is:

[0072]

[0073] P v —The real-time power generated by the photovoltaic system is;

[0074] P 12 —The output power of lithium bromide unit.

[0075] Compared with the existing methods, the present invention has the following advantages:

[0076] (1) The overall design of the transformer fan is changed to an independent design, realizing the design concept of noise reduction according to local conditions. After the heat of the transformer body is circulated and led to the dedicated radiator, the fan system participating in the electric power cycle is centrally controlled to realize the superposition of thermal cycle and electric cycle.

[0077] (2) In transformer areas with large ground space margins, use a circulating pump to draw out the transformer insulating oil and expand the heat sink area. Based on the previous measures, increase the number of fans and control the wind speed as small as possible to achieve the optimal cooling wind speed of no more than 6m / s, thereby achieving the dual goals of reducing noise and carbon emissions.

[0078] Unless otherwise specifically stated, the relative steps, numerical expressions and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0079] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0080] The flow charts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the system, method and computer program product according to multiple embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0081] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0083] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0084] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0085] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0086] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0087] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A control method for a photovoltaic substation for reducing carbon emissions, characterized in that: The photovoltaic substation includes a lithium bromide unit, a radiator, a photovoltaic system, a fan and a ground source heat pump; The photovoltaic system comprises a photovoltaic power generation unit and a transformer, wherein the photovoltaic power generation unit and the transformer; The transformer is connected to the radiator, the lithium bromide unit, the radiator, and the ground source heat pump are connected in sequence, and water is used as an intermediate medium for heat circulation, and the fan is used to dissipate heat from the radiator; The control method of the photovoltaic substation specifically comprises the following steps: Obtaining an average temperature of a building and a first temperature threshold of a load demand, and determining whether the average temperature of the building is higher than the first temperature threshold; If not, reducing the output power of the lithium bromide unit; If yes, when the building needs to lower the temperature, it is determined whether the ground source heat pump has reached the maximum operating power; After the step of determining whether the ground source heat pump has reached the maximum operating power when the building needs to lower its temperature, the control method further comprises: If yes, increase the output power of the lithium bromide unit and reduce the speed of the fan; If not, the steps of obtaining the average temperature of the building, the first temperature threshold of the load demand, and determining whether the average temperature of the building is higher than the first temperature threshold are performed.

2. The control method according to claim 1, characterized in that: The method further comprises: Acquire the temperature of the transformer insulating oil and a second threshold, and determine whether the temperature of the transformer insulating oil is higher than the second threshold; If yes, increase the speed of the fan and / or the speed of the ground source heat pump; If not, the fan speed is reduced.

3. The control method according to claim 1, characterized in that: The control method further comprises: Obtaining the average temperature of the building, the load demand, and determining whether the temperature needs to be increased based on the average temperature; If yes, increase the ground source heat pump and reduce the speed of the fan; If not, the rotation speed of the ground source heat pump is reduced.

4. The control method according to claim 3, characterized in that: The control method further comprises: Acquire the temperature of the transformer insulating oil and a third threshold value, and determine whether the temperature of the transformer insulating oil is higher than the third threshold value; If yes, increasing the speed of the fan and / or increasing the speed of the ground source heat pump to compensate for the thermal imbalance; If not, the fan speed is reduced.

5. The control method according to claim 1, characterized in that: The output power of the lithium bromide unit is: P v —The real-time power generated by the photovoltaic system is; P 12 —The output power of lithium bromide unit.

Images