Electric energy meter for metering multi-path new energy grid-connected electric quantity

Abstract

The invention discloses an electric energy meter for metering multi-path new energy grid-connected electric quantity, and particularly relates to the technical field of electric energy metering, the electric energy meter comprises a shell, a liquid crystal display screen, a wiring end and a wiring room, the shell is provided with a heat dissipation opening and an air inlet, and the upper end and the lower end in the heat dissipation opening are fixedly provided with connecting plates; a ventilation plate is fixedly installed between the two connecting plates, a cooling fan is fixedly installed on the side, close to the heat dissipation opening, of the ventilation plate, and a circuit board is arranged in the shell. According to the electric energy meter for metering the multi-path new energy grid-connected electric quantity, accurate metering of voltage, current, power and electric energy at the multi-path new energy power generation grid-connected position can be achieved, metering data are displayed and output in real time through the liquid crystal display screen and sent to an electric energy management center through the communication module, and the real-time recording and remote meter reading functions are achieved; and meanwhile, the heat dissipation fan is arranged in the shell, so that the heat dissipation efficiency of the electric energy meter is effectively improved, and the service life of internal electric appliances is further prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy metering, and in particular to an electric energy meter for metering the electric energy of multiple new energy grid-connected circuits. Background Art

[0002] In order to protect the environment and reduce fossil fuel power generation, distributed renewable energy generation has received widespread attention. At present, a variety of distributed renewable energy generation systems have been widely used on the user side. Small household solar power generation systems, household wind power generation systems, and electric vehicle energy storage power generation systems have appeared in ordinary people's homes in developed countries.

[0003] After the distributed renewable energy generation system is connected to the grid, there is a two-way flow of power and energy. When the distributed renewable energy generation system cannot meet the power needs of users, it receives power from the grid. When the distributed renewable energy generation system has sufficient power, it feeds the remaining power back to the grid while meeting the power needs of users, thus realizing a two-way flow of energy between the distributed renewable energy generation system and the grid.

[0004] At present, the commissioning of distributed new energy power generation systems such as small household solar energy, wind power, and electric vehicle energy storage has become a development trend. However, the user-side electricity metering method in the prior art is mostly one-way metering, which cannot meet the metering requirements of the two-way flow of electricity after the distributed new energy power generation system is connected to the grid. Some families in Europe and the United States solve the metering problem of the two-way flow of electricity between the distributed new energy power generation system and the power grid by installing an electricity meter and a power generation meter at the same time. However, this method has the disadvantages of waste of resources and inconvenience in use. At the same time, the energy efficiency of the multi-channel new energy electricity connected to the energy meter in the prior art is too high, which causes the internal components of the energy meter to emit too much heat, resulting in a shortened service life of the energy meter. Most of the existing energy meters rely on the heat dissipation holes fixed on the shell for natural heat dissipation, and the heat dissipation efficiency is slow. When used under certain high temperature conditions, the internal heat cannot be quickly discharged, resulting in damage to the internal electrical appliances, which needs further improvement.

[0005] Therefore, an electric energy meter for measuring the power of multiple renewable energy grid-connected electricity is provided. Summary of the invention

[0006] The main purpose of the present invention is to provide an electric energy meter for measuring the amount of electricity connected to the grid by multiple renewable energy sources, which can effectively solve the problems in the background technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is: An electric energy meter for measuring the amount of electricity connected to the grid by multiple renewable energy sources comprises a shell, a liquid crystal display, a wiring terminal and a wiring chamber. The shell is provided with a heat dissipation port and an air inlet. Connecting plates are fixedly installed at both upper and lower ends of the heat dissipation port, a ventilation plate is fixedly installed between the two connecting plates, a cooling fan is fixedly installed on the side of the ventilation plate close to the heat dissipation port, and a circuit board is arranged inside the shell.

[0008] Preferably, the air inlet is arranged on the top of the shell, the heat dissipation port is opened on the left and right sides of the shell, and the heat dissipation port and the inner wall of the air inlet are fixedly installed with a filter screen near the outside, and a water-absorbing sponge is fixedly installed near the inside.

[0009] Preferably, a support plate is fixedly mounted between the two ventilation plates, a mounting plate is fixedly mounted on the support plate, and the circuit board is fixedly mounted on the mounting plate.

[0010] Preferably, a temperature sensor is installed inside the shell.

[0011] Preferably, a plurality of shock absorbers are fixedly mounted on the rear end of the shell, a fixing plate is fixedly mounted on the rear end of the shock absorber, and a plurality of bolt holes are arranged on the fixing plate.

[0012] Preferably, the circuit board is provided with a central processing module, several distributed energy metering modules, a power module and a communication module. The distributed energy metering module is provided with a current acquisition unit and a voltage acquisition unit. The output ends of several distributed energy metering modules are connected to the input end of the central processing module. The central processing module is also connected to the communication module and the liquid crystal display screen. The power module provides reliable and stable working power for the above modules.

[0013] Preferably, the distributed energy metering module includes a voltage transformer, an anti-aliasing low-pass filter, a current transformer and an electric energy metering chip. The voltage acquisition unit converts the grid voltage into a low-voltage signal through the voltage transformer, and then passes through the anti-aliasing low-pass filter to provide it to the voltage channel of the electric energy metering chip for power metering; the current acquisition unit converts the current between the grid and the user into a low-voltage signal through the current transformer and a series sampling resistor, and then passes through the anti-aliasing low-pass filter to provide it to the current channel of the electric energy metering chip for power metering; the electric energy metering chip is a bidirectional electric energy power metering chip, which outputs an electric energy power direction flag while outputting electric energy pulses.

[0014] Preferably, the electric energy metering chip model is CS5460.

[0015] Preferably, the communication module is implemented by one or more of optical fiber, GPRS, power carrier, RS 485, the power module provides a reliable and stable working voltage, the model is MAX756, and the LCD display model is 1062A.

[0016] Preferably, the central processing module is used to perform analysis based on the data monitored by the distributed energy metering module, and can achieve accurate metering of voltage, current, power and electric energy at the point where multiple new energy power generation networks are connected.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention discloses an electric energy meter for measuring the amount of electricity connected to the grid by multiple renewable energy sources. The measured AC voltage and current are sampled and processed by a distributed energy metering module, and then converted into a pulse frequency signal proportional to the active power and sent to a central processor. The central processor accumulates the pulse signal in time according to the time period rate to obtain the total amount of electricity and the amount of electricity at each rate. It can achieve accurate measurement of the voltage, current, power and electric energy at the grid-connected power generation of multiple renewable energy sources. The metering data is displayed and output in real time through an LCD screen, and sent to the electric energy management center through a communication module, realizing real-time recording and remote meter reading functions. The meter has the advantages of high reliability, high precision, and long life. It adapts to a wide voltage range, and the whole machine does not need to be adjusted after leaving the factory. 2. The present invention discloses an electric energy meter for measuring the amount of electricity connected to the grid by multiple new energy sources. By arranging a cooling fan inside the housing, the heat dissipation efficiency of the electric energy meter is effectively improved, and the service life of the internal electrical appliances is further increased. The filter screen arranged at the heat dissipation port and the air inlet can effectively reduce the entry of dust, and the water-absorbing sponge arranged can prevent water vapor from entering the housing. The electric energy meter box with high-efficiency heat dissipation capability has a reasonable structure and high heat dissipation efficiency, and can be widely promoted. 3. The present invention discloses an electric energy meter for measuring the amount of electricity connected to the grid by multiple renewable energy sources. By arranging a shock absorber at the rear of the shell, the electric energy meter is effectively prevented from being affected by external vibrations during operation, thereby protecting the precision parts inside the electric energy meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a left-side structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the cutaway structure of the present invention; Figure 4 It is a principle block diagram of the present invention; Figure 5 It is a connection diagram of the distributed energy metering module of the present invention.

[0019] In the figure: 1. Shell; 2. LCD screen; 3. Wiring terminal; 4. Wiring room; 5. Heat dissipation port; 6. Filter; 7. Cooling fan; 8. Ventilation plate; 9. Connecting plate; 10. Support plate; 11. Mounting plate; 12. Air inlet; 13. Temperature sensor; 14. Water-absorbing sponge; 15. Shock absorber; 16. Fixing plate. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, 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 it can be indirectly connected through an intermediate medium, or 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 by specific circumstances.

[0023] The present invention is further described below in conjunction with specific implementation methods.

[0024] like Figure 1-5As shown, an electric energy meter for measuring the amount of electricity connected to the grid by multiple renewable energy sources comprises a shell 1, a liquid crystal display screen 2, a terminal 3 and a wiring chamber 4, the shell 1 is provided with a heat dissipation port 5 and an air inlet 12, the heat dissipation port 5 has connecting plates 9 fixedly installed at both upper and lower ends thereof, a ventilation plate 8 fixedly installed between the two connecting plates 9, a cooling fan 7 fixedly installed on the side of the ventilation plate 8 close to the heat dissipation port 5, the cooling fan 7 is connected to the ventilation plate 8 by bolts, a plurality of ventilation holes are provided on the ventilation plate 8, the heat generated by the circuit board during operation is discharged to the outside through the ventilation holes and the heat dissipation port 5, thereby improving the heat dissipation effect, and a circuit board is arranged inside the liquid crystal display screen 2.

[0025] The air inlet 12 is arranged at the top of the shell 1, and the heat dissipation port 5 is opened on the left and right sides of the shell 1. The heat dissipation port 5 and the inner wall of the air inlet 12 are fixedly installed with a filter screen 6 near the outside, and a water-absorbing sponge 14 is fixedly installed near the inside. Hot air is discharged to the outside of the shell 1 from one side of the heat dissipation hole, and cold air enters the shell 1 from the air inlet 12. The air inside and outside the shell 1 can circulate to complete the exchange of hot and cold air, thereby achieving the effect of ventilation and heat dissipation, thereby completing the cooling treatment of the circuit board to prevent the normal operation of the circuit board from being affected by excessive temperature. The set filter screen 6 can prevent external dust from entering the shell 1 when the air is circulated, thereby affecting the operation of the circuit board and reducing the service life of the entire circuit table. At the same time, the gas will contact the water-absorbing sponge 14 near the filter screen 6 when entering the shell 1. If the gas entering the shell 1 is relatively humid, the sponge can be used to have a certain drying effect on the humid gas.

[0026] A support plate 10 is fixedly installed between the two ventilation plates 8, a mounting plate 11 is fixedly installed on the support plate 10, and the circuit board is fixedly installed on the mounting plate 11. The heat generated by the circuit board will be discharged to the outside through the ventilation holes and heat dissipation ports 5 on both sides.

[0027] A temperature sensor 13 is installed inside the housing 1 to detect the temperature inside the housing 1. When the temperature inside the housing 1 is higher than a set value, the cooling fan 7 is started to blow the hot air inside the housing 1 to the outside.

[0028] A plurality of shock absorbers 15 are fixedly installed at the rear end of the shell 1, and a fixing plate 16 is fixedly installed at the rear end of the shock absorber 15. The fixing plate 16 is provided with a plurality of bolt holes. During installation, the shell 1 is installed through the fixing plate 16, so that the shock absorbing effect is achieved after the shell 1 is installed through the plurality of shock absorbers 15, thereby preventing the shell 1 from falling off due to the vibration of the installation environment.

[0029] The circuit board is provided with a central processing module, several distributed energy metering modules, a power module and a communication module. The distributed energy metering module is provided with a current acquisition unit and a voltage acquisition unit. The output ends of several distributed energy metering modules are connected to the input end of the central processing module. The central processing module is also connected to the communication module and the liquid crystal display 2. The power module provides reliable and stable working power for the above modules.

[0030] The distributed energy metering module includes a voltage transformer, an anti-aliasing low-pass filter, a current transformer and an electric energy metering chip. The voltage acquisition unit converts the grid voltage into a low-voltage signal through the voltage transformer, and then passes through the anti-aliasing low-pass filter to provide it to the voltage channel of the electric energy metering chip for power metering; the current acquisition unit converts the current between the grid and the user into a low-voltage signal through the current transformer and a series sampling resistor, and then passes through the anti-aliasing low-pass filter to provide it to the current channel of the electric energy metering chip for power metering; the electric energy metering chip is a bidirectional electric energy power metering chip, which outputs an electric energy power direction flag while outputting electric energy pulses. The model of the electric energy metering chip is CS5460.

[0031] The communication module is implemented by one or more of optical fiber, GPRS, power carrier, and RS 485. The metering data is sent to the power management center through the communication module to realize real-time recording and remote meter reading functions. The power module provides a reliable and stable working voltage, and its model is MAX756. The central processing module is used to analyze the data monitored by the distributed energy metering module, and can realize accurate measurement of voltage, current, power and electric energy at the grid-connected point of multiple renewable energy power generation. The LCD display 2 is model 1062A.

[0032] The working principle of the present invention is: after the measured AC voltage and current are sampled and processed by the distributed energy metering module, they are converted into pulse frequency signals proportional to the active power and sent to the central processor. The central processor accumulates the pulse signals according to the time period rate to obtain the total power and the power of each rate, which can realize the accurate measurement of voltage, current, power and electric energy at the grid connection of multiple renewable energy power generation. The metering data is displayed and output in real time through the LCD screen 2, and sent to the power management center through the communication module to realize the real-time recording and remote meter reading functions. The meter has the advantages of high reliability, high precision, long life, etc. It adapts to a wide voltage range, and the whole machine does not need to be adjusted after leaving the factory.

[0033] When the temperature sensor 13 detects that the temperature inside the shell 1 is too high, the central processing unit controls the cooling fan 7 to start, and the cooling fan 7 blows the hot air inside the shell 1 to the outside. Through the provided heat dissipation port 5 and the air inlet 12, the air inside and outside the shell 1 can circulate, completing the exchange of hot and cold air, thereby achieving the effect of ventilation and heat dissipation, effectively improving the heat dissipation efficiency of the electric energy meter, and avoiding the internal temperature of the electric energy meter being too high, which affects the service life of the internal electrical appliances.

[0034] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electric energy meter for measuring the amount of electricity connected to the grid by multiple renewable energy sources, characterized in that: The invention comprises a housing (1), a liquid crystal display screen (2), a wiring terminal (3) and a wiring chamber (4); the housing (1) is provided with a heat dissipation port (5) and an air inlet (12); the heat dissipation port (5) is fixedly provided with connection plates (9) at both upper and lower ends; a ventilation plate (8) is fixedly provided between the two connection plates (9); a heat dissipation fan (7) is fixedly provided on one side of the ventilation plate (8) close to the heat dissipation port (5); and a circuit board is provided inside the housing (1); the air inlet (12) is provided at the top of the housing (1); the heat dissipation port (5) is provided on both sides of the housing (1); The inner walls of the heat dissipation port (5) and the air inlet (12) are both fixedly mounted with filter screens (6) near the outside, and are both fixedly mounted with water-absorbing sponges (14) near the inside; a support plate (10) is fixedly mounted between the two ventilation plates (8), a mounting plate (11) is fixedly mounted on the support plate (10), and the circuit board is fixedly mounted on the mounting plate (11); a temperature sensor (13) is installed inside the housing (1); a plurality of shock absorbers (15) are fixedly mounted at the rear end of the housing (1), a fixing plate (16) is fixedly mounted at the rear end of the shock absorber (15), and the The fixing plate (16) is provided with a plurality of bolt holes; the circuit board is provided with a central processing module, a plurality of distributed energy metering modules, a power module and a communication module; the distributed energy metering module is provided with a current acquisition unit and a voltage acquisition unit; the output ends of the plurality of distributed energy metering modules are connected to the input ends of the central processing module; the central processing module is also connected to the communication module and the liquid crystal display (2); the power module provides reliable and stable working power for the above modules; the distributed energy metering module comprises a voltage transformer, an anti-aliasing low-pass filter, a current transformer and an electric energy metering chip; the voltage acquisition unit converts the grid voltage into a low voltage signal through the voltage transformer, and then passes through the anti-aliasing low-pass filter to provide the signal to the voltage channel of the electric energy metering chip for power metering; the current acquisition unit converts the current between the grid and the user into a low voltage signal through the current transformer and a series sampling resistor, and then passes through the anti-aliasing low-pass filter to provide the signal to the current channel of the electric energy metering chip for power metering; the electric energy metering chip is a bidirectional electric energy power metering chip, which outputs an electric energy power direction flag while outputting electric energy pulses.

2. The electric energy meter for measuring the amount of electricity connected to the grid by multiple renewable energy sources according to claim 1, characterized in that: The electric energy metering chip model is CS5460.

3. The electric energy meter for measuring the amount of electricity connected to the grid by multiple renewable energy sources according to claim 2, characterized in that: The communication module is implemented by one or more of optical fiber, GPRS, power carrier, RS 485. The power module provides a reliable and stable working voltage, and its model is MAX756. The LCD display 2 is model 1062A.

4. The electric energy meter for measuring the amount of electricity connected to the grid by multiple renewable energy sources according to claim 3 is characterized by: The central processing module is used to analyze the data monitored by the distributed energy metering module, and can achieve accurate measurement of voltage, current, power and electric energy at the grid-connected point of multiple renewable energy power generation.

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