Dynamic reactive power compensation device of photovoltaic power station

Abstract

The invention relates to the technical field of reactive power compensation, and discloses a photovoltaic power station dynamic reactive power compensation device which comprises a compensation cabinet, containing cavities are formed in the compensation cabinet, hinges are installed on one sides of the inner walls of the multiple containing cavities, one ends of the hinges are fixedly connected with access doors, compensation capacitors are installed in the containing cavities, and the access doors are fixedly connected with the access doors. The output end of the compensation capacitor is electrically connected with a cable, a ventilation opening is formed in the outer wall of the compensation cabinet, a membrane separation dehumidification mechanism is installed in the ventilation opening and used for conducting water molecule separation on circulating air, and a heat dissipation dehumidification mechanism is installed in the compensation cabinet and used for conducting heat dissipation initial integration on the multiple containing cavities. The heat dissipation and dehumidification mechanism utilizes an air pump, an evaporator, a diffusion pipe and other components to work cooperatively, heat dissipation and dehumidification integration of a plurality of containing cavities is achieved, processed low-temperature dry air is evenly sent back, and normal operation of electrical elements is guaranteed in an all-around mode.

Description

Technical Field

[0001] The invention relates to the technical field of reactive power compensation, and in particular to a dynamic reactive power compensation device for a photovoltaic power station. Background Art

[0002] Reactive power compensation, referred to as reactive compensation, plays a role in improving the power factor of the power grid in the power supply system, reducing the loss of power supply transformers and transmission lines, improving power supply efficiency, and improving the power supply environment. Therefore, reactive power compensation devices are indispensable in the power system. Reasonable selection of compensation devices can minimize the loss of the power grid and improve the quality of the power grid. On the contrary, improper selection or use may cause voltage fluctuations in the power supply system, increased harmonics, and many other factors.

[0003] Usually, the dynamic reactive power compensation device of a photovoltaic power station includes a reactive power compensation box and a reactive power compensation unit installed in the box. Since there are many circuit components inside the reactive power compensation unit and the internal space is compactly arranged, moisture and condensation in the cabinet may cause circuit components of the reactive power compensation unit to suffer from creepage, flashover and other accidents. Once a power supply accident occurs, production cannot be resumed in a short time, resulting in significant economic losses. The existing reactive power compensation box is provided with heat dissipation holes, but it does not have a dehumidification device. Especially in rainy weather, the reactive power compensation unit is easily affected by moisture and a series of problems may occur. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a dynamic reactive power compensation device for a photovoltaic power station, which solves the problem that the reactive power compensation box is not equipped with a dehumidification device and the reactive power compensation unit is easily affected by moisture and malfunctions in humid weather.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a dynamic reactive power compensation device for a photovoltaic power station, comprising a compensation cabinet, a containing cavity is provided inside the compensation cabinet, a hinge is installed on one side of the inner wall of a plurality of the containing cavities, an inspection door is fixedly connected to one end of the hinge, a compensation capacitor is installed inside the containing cavity, an output end of the compensation capacitor is electrically connected to a cable, a vent is provided on the outer wall of the compensation cabinet, a membrane separation and dehumidification mechanism is installed inside the vent for separating water molecules from the circulating air, and a heat dissipation and dehumidification mechanism is installed inside the compensation cabinet for initial integration of heat dissipation for a plurality of containing cavities.

[0006] Preferably, the heat dissipation and dehumidification mechanism includes an air pump, which is installed on one side of the inner wall of the top containing cavity, the input end of the air pump is connected to a dispersion pipe, the dispersion pipe is connected to multiple containing cavities, the output end of the air pump is connected to the input end of the compressor, the output end of the compressor is connected to one end of a throttle, the other end of the throttle is connected to the input end of a condenser, the output end of the condenser is connected to the input end of an evaporator, the output end of the evaporator is connected to a diffusion pipe, and the diffusion pipes are distributed inside multiple containing cavities.

[0007] Preferably, the membrane separation dehumidification mechanism includes a fixed ring, which is installed inside the vent, and one end of the inner wall of the fixed ring is sequentially installed with a polymer breathable membrane, an air guide assembly and a drainage channel, and one end of the drainage channel is connected to one end of the drainage pipe.

[0008] Preferably, a temperature sensor and a humidity sensor are installed on one side of the inner wall of the middle containing cavity, and the output ends of the temperature sensor and the humidity sensor are electrically connected to the air pump.

[0009] Preferably, the air guiding assembly comprises a flow balancing net, which is mounted on one side of the inner wall of the fixing ring, a porous plate is mounted on one side of the outer wall of the flow balancing net, and a guide vane is mounted on one side of the outer wall of the porous plate.

[0010] Preferably, a rotating shaft is installed on one side of the outer wall of the guide plate, and a mold frame is installed on one side of the outer wall of the porous plate. Both ends of the rotating shaft are rotatably connected to the inside of the mold frame, one end of a spring is fixedly connected to one side of the outer wall of the rotating shaft, and the other end of the spring is fixed to one side of the inner wall of the mold frame.

[0011] Preferably, the outer wall of the guide plate is provided with evenly distributed grooves.

[0012] Preferably, the outer wall of the diffusion tube is installed with a uniformly distributed heat extension plate.

[0013] Preferably, a sealing strip is installed on one side of the inner wall of the inspection door.

[0014] The present invention provides a photovoltaic power station dynamic reactive power compensation device, which has the following beneficial effects: 1. The present invention realizes the integrated heat dissipation and dehumidification of multiple containing chambers by utilizing components such as an air pump, a compressor, a throttle, a condenser, an evaporator, and a diffusion tube to work in coordination through a heat dissipation and dehumidification mechanism. The system can quickly and effectively discharge the hot and humid air in the containing chamber and evenly return the treated low-temperature dry air, which not only reduces the temperature but also removes moisture, thereby comprehensively ensuring the normal operation of electrical components and improving the stability and reliability of the device.

[0015] 2. The present invention uses a membrane separation dehumidification mechanism to efficiently dehumidify the air entering the compensation cabinet. The flow-equalizing net and the porous plate make the air evenly distributed. The guide plate further optimizes the airflow to ensure that the air flows through the polymer breathable membrane in the best state. The polymer breathable membrane has preferential permeability to water molecules, which separates the water molecules from the air and discharges them through the drainage channel and the drainage pipe, ensuring that the air entering the compensation cabinet is dry, effectively preventing the electrical components from being damaged by moisture.

[0016] 3. The present invention guides the air entering the membrane separation dehumidification mechanism in all directions through the coordinated work of the flow-equalizing net, porous plate and guide vane in the air guide assembly. The flow-equalizing net avoids airflow concentration, the porous plate further refines and disperses the airflow, and the guide vane rotates around the rotating axis under the action of the airflow and is reset by a spring. In conjunction with the grooves on its surface, the airflow flows to the polymer breathable membrane in a more orderly and uniform manner, greatly improving the dehumidification efficiency and effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the reactive power compensation device in the present invention; Figure 2 It is a display diagram of the reactive power compensation device in the present invention; Figure 3 is a schematic diagram of a reactive power compensation device in the present invention; Figure 4 for Figure 3 A in the enlarged view; Figure 5 is a schematic diagram of the heat dissipation and dehumidification mechanism of the present invention; Figure 6 It is a schematic diagram of the membrane separation and dehumidification mechanism in the present invention; Figure 7 It is an exploded view of the membrane separation and dehumidification mechanism of the present invention; Figure 8 for Figure 7 Enlarged view of point B in .

[0018] Among them, 1. compensation cabinet; 2. storage cavity; 3. hinge; 4. inspection door; 5. compensation capacitor; 6. cable; 7. vent; 8. membrane separation and dehumidification mechanism; 801. fixing ring; 802. polymer breathable membrane; 803. drainage channel; 804. drainage pipe; 805. flow equalization net; 806. porous plate; 807. guide plate; 808. rotating shaft; 809. workpiece frame; 810. spring; 811. groove; 9. heat dissipation and dehumidification mechanism; 901. air pump; 902. dispersion pipeline; 903. compressor; 904. throttle; 905. condenser; 906. evaporator; 907. diffusion tube; 908. temperature sensor; 909. humidity sensor; 910. heat extension plate; 10. sealing strip. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0020] Please refer to the attached Figure 1 -Attached Figure 8 The embodiment of the present invention provides a dynamic reactive power compensation device for a photovoltaic power station, including a compensation cabinet 1, a containing cavity 2 is provided inside the compensation cabinet 1, a hinge 3 is installed on one side of the inner wall of the plurality of containing cavities 2, an inspection door 4 is fixedly connected to one end of the hinge 3, a compensation capacitor 5 is installed inside the containing cavity 2, an output end of the compensation capacitor 5 is electrically connected to a cable 6, a vent 7 is provided on the outer wall of the compensation cabinet 1, a membrane separation and dehumidification mechanism 8 is installed inside the vent 7, which is used to separate water molecules from the circulating air, and a heat dissipation and dehumidification mechanism 9 is installed inside the compensation cabinet 1, which is used to initially integrate the heat dissipation of the plurality of containing cavities 2; A sealing strip 10 is installed on one side of the inner wall of the inspection door 4; The heat dissipation and dehumidification mechanism 9 includes an air pump 901, which is installed on one side of the inner wall of the top containing chamber 2. The input end of the air pump 901 is connected to a dispersion pipe 902, which is connected to multiple containing chambers 2. The output end of the air pump 901 is connected to the input end of a compressor 903, the output end of the compressor 903 is connected to one end of a throttle 904, the other end of the throttle 904 is connected to the input end of a condenser 905, the output end of the condenser 905 is connected to the input end of an evaporator 906, the output end of the evaporator 906 is connected to a diffusion pipe 907, and the diffusion pipes 907 are distributed inside multiple containing chambers 2. The outer wall of the diffusion tube 907 is installed with a uniformly distributed heat extension plate 910; Specifically, the storage chamber 2 provided in the compensation cabinet 1 provides a storage space for various electronic components. A hinge 3 is installed on one side of the inner wall of the plurality of storage chambers 2. One end of the hinge 3 is fixedly connected to the inspection door 4, which facilitates the inspection and maintenance operations inside the compensation cabinet 1. The compensation capacitor 5 installed inside the storage chamber 2 is connected to the external circuit through the cable 6. The compensation capacitor 5 provides capacitive reactive power to the power system to compensate for the inductive reactive power in the power system, thereby improving the power factor of the power system and achieving the purpose of reactive power compensation. During the operation of the device, in order to ensure the stability of the internal environment of the compensation cabinet 1 and avoid damage to the internal electrical components due to overheating and humidity, a heat dissipation and dehumidification mechanism 9 and a membrane separation and dehumidification mechanism 8 are provided; The air pump 901 of the heat dissipation and dehumidification mechanism 9 is installed on one side of the inner wall of the top containing chamber 2 as the starting power source. Its input end is connected with multiple containing chambers 2 through a dispersion pipe 902. The air pump 901 will extract hot and humid air from the containing chamber 2. This part of hot and humid air contains the heat generated by the operation of the internal electrical components and the humid air circulated from the outside to the inside of the compensation cabinet 1. The air pump 901 delivers the extracted air to the input end of the compressor 903. The compressor 903 compresses the inhaled air and compresses it into a high-temperature and high-pressure gas to provide power for the entire refrigeration cycle. Subsequently, the high-temperature and high-pressure gas is delivered to one end of the throttle 904. The throttle 904 throttles and reduces the pressure on the gas to adjust the flow rate and pressure of the refrigerant to prepare for the subsequent evaporative refrigeration process. The gas processed by the throttle 904 enters the input end of the condenser 905. In the condenser 905, the gas exchanges heat with the external environment. Through the cooling effect of the condenser 905, the gas is cooled into a liquid. During the process, the high-temperature and high-pressure gas releases its own heat to the external environment, and then the condensed liquid enters the input end of the evaporator 906. In the evaporator 906, the refrigerant evaporates under low temperature and low pressure conditions, absorbs the heat in the containing chamber 2, thereby achieving a refrigeration effect. When the refrigerant evaporates in the evaporator 906, the heat in the containing chamber 2 is taken away, achieving the purpose of internal heat dissipation. Finally, the low-temperature dry air treated by the evaporator 906 is evenly distributed to the interior of each containing chamber 2 through the diffusion tube 907. The evenly distributed heat extension plate 910 installed on the diffusion tube 907 can further improve the efficiency of heat exchange. The heat extension plate 910 can increase the contact area between the diffusion tube 907 and the air in the containing chamber 2, so that the cold air can more fully exchange heat with the surrounding environment, thereby more effectively taking away the heat in the containing chamber 2, and at the same time dehumidifying the air in the containing chamber 2 to ensure that the internal electrical components are in a suitable temperature and humidity environment, thereby ensuring the stable operation of the entire reactive power compensation device; The membrane separation dehumidification mechanism 8 comprises a fixing ring 801, which is installed inside the vent 7. A polymer breathable membrane 802, an air guide assembly and a drainage channel 803 are sequentially installed on one end of the inner wall of the fixing ring 801. One end of the drainage channel 803 is connected to one end of a drainage pipe 804. The air guide assembly includes a flow balancing net 805, which is installed on one side of the inner wall of the fixing ring 801, and a porous plate 806 is installed on one side of the outer wall of the flow balancing net 805, and a guide plate 807 is installed on one side of the outer wall of the porous plate 806; A rotating shaft 808 is installed on one side of the outer wall of the guide plate 807, and a mold frame 809 is installed on one side of the outer wall of the porous plate 806. Both ends of the rotating shaft 808 are rotatably connected to the inside of the mold frame 809. One end of a spring 810 is fixedly connected to one side of the outer wall of the rotating shaft 808, and the other end of the spring 810 is fixed to one side of the inner wall of the mold frame 809. The outer wall of the guide plate 807 is provided with evenly distributed grooves 811; Specifically, the air guide component is mainly composed of a flow-equalizing net 805, a porous plate 806 and a guide vane 807. The flow-equalizing net 805 is installed on one side of the inner wall of the fixed ring 801. Its function is to evenly distribute the incoming air, avoid local concentration or turbulence of the airflow, and ensure that the air flows through subsequent components in a relatively uniform state. The porous plate 806 further refines the flow of air, and it can disperse the air passing through the flow-equalizing net 805 more finely. The guide vane 807 installed on one side of the outer wall of the porous plate 806 plays an important role in guiding the air flow. A rotating shaft 808 is installed on the guide vane 807. Both ends of the rotating shaft 808 are rotatably connected to the inside of the workpiece frame 809, and a spring 810 is fixedly connected to one side of the outer wall of the rotating shaft 808. The other end of the spring 810 Fixed on one side of the inner wall of the workpiece frame 809, when air flows through, the air flow will exert force on the guide plate 807, causing the guide plate 807 to rotate around the rotating shaft 808 at a certain angle. At this time, the spring 810 will be stretched or twisted to store a certain elastic potential energy. When the air flow intensity weakens or disappears, the spring 810 releases the stored elastic potential energy. During the small rotation of the guide plate 807, the circulating air is fanned, further improving the uniformity of the air flowing through the polymer breathable membrane 802, thereby better guiding the air flow. At the same time, the outer wall of the guide plate 807 is provided with evenly distributed grooves 811, which can further guide the air flow, so that the air flow forms a more orderly flow state on the surface of the guide plate 807, reducing the turbulence of the air flow, and improving the contact efficiency between the air and the subsequent components; The air treated by the flow-equalizing net 805, the porous plate 806 and the guide plate 807 will enter the polymer breathable membrane 802 in a uniform and orderly state. When the air flows through the polymer breathable membrane 802, due to the preferential permeability of the polymer breathable membrane 802 to water molecules, the water molecules in the air will pass through the polymer breathable membrane 802, while other gas molecules will be blocked. The separated water molecules will be collected by the drainage channel 803. The drainage channel 803 plays a role of convergence and guidance, and guides the separated water molecules to one end of the drainage pipe 804 connected thereto. The drainage pipe 804 can discharge the collected water to the outside of the device, thereby realizing the dehumidification operation of the air entering the compensation cabinet 1, ensuring that the air entering the compensation cabinet 1 is dry, and preventing humid air from damaging the internal electrical components including the compensation capacitor 5 and the cable 6, thereby ensuring the stable operation of the dynamic reactive power compensation device of the entire photovoltaic power station.

[0021] A temperature sensor 908 and a humidity sensor 909 are installed on one side of the inner wall of the middle containing chamber 2, and the output ends of the temperature sensor 908 and the humidity sensor 909 are electrically connected to the air pump 901; Specifically, the temperature sensor 908 and the humidity sensor 909 simultaneously monitor the temperature and humidity inside the containing cavity 2 in real time. When the temperature inside the containing cavity 2 rises due to the operation of the electronic components and the humidity rises due to the circulation of the external air, the air pump 901 extracts the air inside the containing cavity 2. During the extraction process, the heat and moisture inside the containing cavity 2 are simultaneously extracted, thereby completing the integrated heat dissipation and dehumidification inside the containing cavity 2.

[0022] Working principle: When the dynamic reactive power compensation device of the photovoltaic power station is working, the storage chamber 2 in the compensation cabinet 1 accommodates electrical components such as the compensation capacitor 5. The compensation capacitor 5 is connected to the external circuit through the cable 6 to provide capacitive reactive power to the power system, improve the power factor to achieve reactive power compensation, and a membrane separation dehumidification mechanism 8 is installed at the ventilation port 7 of the compensation cabinet 1, and a heat dissipation and dehumidification mechanism 9 is provided inside to maintain a stable internal environment.

[0023] The inspection door 4 is installed on one side of the storage chamber 2 by means of a hinge 3 to facilitate internal inspection. The sealing strip 10 on the inner wall ensures good sealing to prevent external moisture and dust from entering. The temperature sensor 908 and the humidity sensor 909 in the middle storage chamber 2 monitor the temperature and humidity in real time. Once an increase in temperature or humidity is detected, a signal will be sent to the air pump 901.

[0024] The air pump 901 is located on the inner wall of the top chamber 2. After receiving the signal, it extracts hot and humid air from each chamber 2 through the dispersion pipe 902 and delivers it to the compressor 903. The compressor 903 compresses the air into high-temperature and high-pressure gas to promote the refrigeration cycle. After the high-temperature and high-pressure gas is throttled and depressurized by the throttle 904, it enters the condenser 905, exchanges heat with the external environment, cools into liquid and releases heat. The liquid then enters the evaporator 906, evaporates at low temperature and low pressure, absorbs the heat in the chamber 2 to achieve refrigeration and heat dissipation, and finally, the low-temperature dry air treated by the evaporator 906 is evenly distributed to each chamber 2 through the diffusion pipe 907 with a heat extension plate 910 on the outer wall. The heat extension plate 910 increases the contact area and efficiently takes away heat and moisture.

[0025] At the same time, outside air enters the membrane separation dehumidification mechanism 8 from the vent 7. The fixed ring 801 of the mechanism is installed in the vent 7 to play a supporting role. The air is first evenly distributed through the flow-balancing net 805, and then finely dispersed through the porous plate 806, and then reaches the guide vane 807. Under the action of the airflow, the guide vane 807 rotates around the rotating shaft 808, stretching the spring 810 to store elastic potential energy. When the airflow weakens, the spring 810 releases the potential energy to reset the guide vane 807. During its rotation, it fans the air and cooperates with the groove 811 to make the airflow flow to the polymer breathable membrane 802 in a more orderly manner. Because the polymer breathable membrane 802 has preferential permeability to water molecules, the water molecules pass through the membrane and are collected by the drainage channel 803, and are discharged from the device through the drainage pipe 804. The dry air enters the compensation cabinet 1 to prevent humid air from damaging the internal electrical components. Finally, all components work together to ensure the stable operation of the dynamic reactive power compensation device of the photovoltaic power station.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic power station dynamic reactive power compensation device, comprising a compensation cabinet (1), characterized in that: The compensation cabinet (1) has a containing cavity (2) formed inside, a hinge (3) is installed on one side of the inner wall of the plurality of containing cavities (2), one end of the hinge (3) is fixedly connected to an inspection door (4), a compensation capacitor (5) is installed inside the containing cavity (2), an output end of the compensation capacitor (5) is electrically connected to a cable (6), an outer wall of the compensation cabinet (1) has a vent (7), a membrane separation and dehumidification mechanism (8) is installed inside the vent (7), and is used to separate water molecules from the circulating air, and a heat dissipation and dehumidification mechanism (9) is installed inside the compensation cabinet (1), and is used to initially integrate the heat dissipation of the plurality of containing cavities (2).

2. A photovoltaic power station dynamic reactive power compensation device according to claim 1, characterized in that: The heat dissipation and dehumidification mechanism (9) comprises an air pump (901), the air pump (901) being installed on one side of the inner wall of the top containing cavity (2), the input end of the air pump (901) being connected to a dispersion pipe (902), the dispersion pipe (902) being connected to a plurality of containing cavities (2), the output end of the air pump (901) being connected to an input end of a compressor (903), the output end of the compressor (903) being connected to one end of a throttle (904), the other end of the throttle (904) being connected to an input end of a condenser (905), the output end of the condenser (905) being connected to an input end of an evaporator (906), the output end of the evaporator (906) being connected to a diffusion pipe (907), the diffusion pipe (907) being distributed inside the plurality of containing cavities (2).

3. A photovoltaic power station dynamic reactive power compensation device according to claim 1, characterized in that: The membrane separation dehumidification mechanism (8) comprises a fixing ring (801), the fixing ring (801) being installed inside the ventilation opening (7), one end of the inner wall of the fixing ring (801) being installed with a polymer breathable membrane (802), an air guide assembly and a drainage channel (803) in sequence, and one end of the drainage channel (803) being connected to one end of a drainage pipe (804).

4. A photovoltaic power station dynamic reactive power compensation device according to claim 2, characterized in that: A temperature sensor (908) and a humidity sensor (909) are installed on one side of the inner wall of the central containing cavity (2), and the output ends of the temperature sensor (908) and the humidity sensor (909) are both electrically connected to the air pump (901).

5. A photovoltaic power station dynamic reactive power compensation device according to claim 3, characterized in that: The air guiding assembly comprises a flow balancing net (805), wherein the flow balancing net (805) is mounted on one side of the inner wall of the fixing ring (801), a porous plate (806) is mounted on one side of the outer wall of the flow balancing net (805), and a guide plate (807) is mounted on one side of the outer wall of the porous plate (806).

6. A photovoltaic power station dynamic reactive power compensation device according to claim 5, characterized in that: A rotating shaft (808) is installed on one side of the outer wall of the guide plate (807), and a workpiece frame (809) is installed on one side of the outer wall of the porous plate (806); both ends of the rotating shaft (808) are rotatably connected to the inside of the workpiece frame (809); one end of a spring (810) is fixedly connected to one side of the outer wall of the rotating shaft (808), and the other end of the spring (810) is fixed to one side of the inner wall of the workpiece frame (809).

7. A photovoltaic power station dynamic reactive power compensation device according to claim 5, characterized in that: The outer wall of the guide plate (807) is provided with evenly distributed grooves (811).

8. A photovoltaic power station dynamic reactive power compensation device according to claim 2, characterized in that: The outer wall of the diffusion tube (907) is installed with a uniformly distributed heat extension plate (910).

9. A photovoltaic power station dynamic reactive power compensation device according to claim 1, characterized in that: A sealing strip (10) is installed on one side of the inner wall of the inspection door (4).

Images