Sound barrier system and working method thereof

Abstract

The invention relates to the technical field of sound barrier systems, in particular to a sound barrier system and a working method thereof. The system comprises a direct-current street lamp, the direct-current street lamp is connected with a plurality of sound barriers, each sound barrier comprises a photovoltaic panel and a storage battery, the photovoltaic panel is connected with the storage battery on one hand and connected into a grid-connected cabinet through an inverter on the other hand, and the grid-connected cabinet is connected with a municipal power supply; the storage battery can receive electric energy of the grid-connected cabinet through the inverter while receiving the electric energy of the photovoltaic panel, and the storage battery is connected with the direct-current street lamp to provide electric energy for the direct-current street lamp; the photovoltaic panel, the storage battery and the direct-current street lamp are connected in series through a direct-current cable, the photovoltaic panel and the inverter are connected through a direct-current cable, the storage battery and the inverter are connected through a direct-current cable, and the inverter, the grid-connected cabinet and the municipal power supply are connected through an alternating-current cable. According to the system design, nonferrous metals are saved to the maximum extent, and energy conservation, emission reduction and cost reduction are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of sound barrier systems, and in particular to a sound barrier system and a working method thereof. Background Art

[0002] Sound barriers are common facilities on highways and urban elevated roads. In recent years, with the popularization of photovoltaic sound barriers, due to the narrow and long characteristics of highways and urban elevated roads, the electricity generated by photovoltaic sound barriers needs to go through a long cable path to be connected to the grid, consuming a large amount of non-ferrous metals; on the other hand, highways and urban elevated roads must be equipped with street lights, which also need to obtain electricity from municipal power sources through long cable paths, consuming a large amount of non-ferrous metals. In order to reasonably coordinate power generation and electricity consumption, improve energy utilization efficiency, and save non-ferrous metals, it is urgent to improve the existing sound barrier system. Summary of the invention

[0003] The problem to be solved by the present invention is to improve the existing sound barrier system to reduce the use of non-ferrous metals and improve energy utilization.

[0004] In view of the deficiencies in the prior art, the technical solution adopted by the present invention to solve the technical problems is: a sound barrier system, including a DC street lamp, the DC street lamp is connected to multiple sound barriers, each sound barrier includes a photovoltaic panel and a battery, the photovoltaic panel is connected to the battery on the one hand, and is connected to a grid-connected cabinet through an inverter on the other hand, and the grid-connected cabinet is connected to a municipal power supply; the battery can receive electric energy from the photovoltaic panel and also from the grid-connected cabinet through the inverter, and the battery is connected to the DC street lamp to provide electric energy for it; the photovoltaic panel, the battery and the DC street lamp are connected in series through a DC cable, the photovoltaic panel and the inverter, the battery and the inverter are connected through a DC cable, and the inverter, the grid-connected cabinet and the municipal power supply are connected through an AC cable.

[0005] Preferably, the battery is determined by capacity, and the capacity is determined as follows:

[0006] W b = kTP / n,

[0007] Where: W b is the battery capacity of each sound barrier, in kWh; k is the redundancy coefficient, which is determined according to the working characteristics of the battery, redundancy in rainy weather, etc.; T is the length of the night on the local winter solstice, in h; P is the power of each DC street lamp, in kW; n is the number of sound barriers corresponding to each DC street lamp.

[0008] A working method of a sound barrier system comprises the following steps:

[0009] S1: Determine whether it is night. When night comes, the DC street lamp will automatically light up, and the battery will start to supply power to the DC street lamp;

[0010] S2: Determine the battery power W b1 Is it sufficient? If the voltage is sufficient, the battery continues to supply power to the DC street lamp; b1 The calculation is as follows:

[0011] W b1 =kt1P / n

[0012] Where: W b1 is the battery capacity of each sound barrier that night, in kWh;

[0013] t1 is the length of the local night on that day, in hours;

[0014] S3: The battery voltage is insufficient, and the municipal power supply is sent to the battery through the inverter, and the battery then supplies power to the DC street lamp. At this time, the municipal power supply is used as an emergency power supply, generating electricity charges;

[0015] S4: Determine whether it is daybreak, when it is daybreak, the DC street lamp automatically turns off, the battery automatically stops supplying power, and continues to supply power before daybreak;

[0016] S5: After daybreak, determine the battery power W b2 Is it greater than 0, W b2 >0, the electricity is sent to the grid through the inverter. At this time, the battery acts as a power generation device and generates electricity sales income;

[0017] W b2 =W b1 -t1P / n.

[0018] Preferably, the working process of battery energy storage is as follows:

[0019] Step 1: The battery controller predicts the photovoltaic power generation curve based on local weather conditions;

[0020] Step 2: Determine whether it is the peak power generation period, if so, use battery energy storage;

[0021] Step 3: Determine the battery power W b3 Can it meet the power demand of DC street lamps that night? If not, continue to store energy; if yes, proceed to step 4; the power W b3 Satisfies the following formula: W b3 >W b1 ;

[0022] Step 4: The battery controller obtains the peak and valley electricity price information and determines whether the real-time electricity price is the peak electricity price. If so, the surplus electricity is sold to the grid and the energy storage ends after the electricity is sold. Otherwise, the energy storage ends directly.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. The present invention reduces the cost of nonferrous metals, eliminates the AC cables laid for street lamps, and reduces the DC cables laid for photovoltaic power generation systems. Compared with centralized energy storage, the present invention reduces the cable laying required for energy storage equipment. Since all the cables laid along the road are DC cables, there is no need to leave a path for AC cables, thus reducing the size and number of cable trough boxes.

[0025] 2. The system structure of the present invention is simple and the failure rate is low. On the one hand, the present invention eliminates the AC-DC conversion power supply on the street lamp, thereby reducing the failure rate of the street lamp; on the other hand, the present invention reduces the capacity of the inverter, thereby reducing the failure rate of the inverter;

[0026] 3. Reduced floor space, friendly construction interface, and reduced land area required for energy storage equipment compared to centralized energy storage. The front end of the present invention is all DC cables, and the rear end is all AC cables, which reduces the complexity of cable laying. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a circuit diagram of a sound barrier system involved in the present invention;

[0028] Figure 2 It is a schematic diagram of the structural connection of the sound barrier system of the present invention;

[0029] Figure 3 The present invention relates to a flow chart of a battery supplying power to a DC street lamp;

[0030] Figure 4 It is a battery energy storage work flow chart involved in the present invention;

[0031] Explanation of the accompanying drawings: 1. DC street lamp; 2. Sound barrier; 21. Photovoltaic panel; 22. Battery; 3. Inverter; 4. Grid-connected cabinet; 5. Municipal power supply. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0033] Photovoltaic sound barriers embed photovoltaic panels into sound barriers, so that sound barriers on highways and urban elevated roads have the function of generating electricity. However, traditional photovoltaic sound barriers only consider the grid connection scheme, not the power consumption scheme. In traditional photovoltaic sound barriers, the DC power generated by several photovoltaic devices is converted into AC power through an inverter, and then connected to the municipal power supply through a grid cabinet, during which a large number of DC and AC cables are used. The AC street lamps used for lighting on highways and urban elevated roads are powered by an AC system, and the street lamps are powered by an AC municipal power supply. However, with the popularization of LED lighting, the light-emitting devices at the end of the street lamps use DC power, so it is necessary to add an AC-DC conversion power supply inside the street lamps, and the municipal grid uses a large number of AC cables to power the street lamps. That is to say, the photovoltaic sound barrier connects the DC power generated to the inverter through a DC cable, and after converting the AC power, it uses an AC cable to connect to the municipal power supply through a grid cabinet. On the other hand, the municipal power supply is sent to the AC street lamps through AC cables, and the street lamps use AC-DC conversion power supplies to convert the AC power provided by the municipality into DC power, so that the light-emitting devices at the end work. The process of photovoltaic sound barriers entering municipal power supply and municipal power supply supplying street lamps consumes a large amount of non-ferrous metals, and a cable laying path of sufficient size needs to be reserved; the large number of current conversion electronic devices leads to a high equipment failure rate. The inverter of the photovoltaic sound barrier system and the AC-DC conversion power supply on the street lamp are both current conversion electronic devices that are prone to failure. Once damaged during operation, the photovoltaic system will be unable to generate electricity and road lighting will be turned off, which may lead to economic losses and traffic accidents.

[0034] In order to solve the above problems, the present invention provides a sound barrier system, the circuit diagram of which is as follows: Figure 1 As shown, one end of the photovoltaic panel 21 is connected to the DC street lamp 1 through the battery 22, and a DC cable is used between the photovoltaic panel 21, the battery 22 and the DC street lamp 1; the other end of the photovoltaic panel 21 is connected to the grid cabinet 4 through the inverter 3, and the grid cabinet 4 is connected to the municipal power supply 5. The photovoltaic panel 21 is connected to the inverter 3 through a DC cable, and the inverter 3 and the municipal power supply 5 use an AC cable. The battery 22 is also connected to the inverter 3 through a DC cable, and the municipal power supply 5 is used to supply power to the battery 22. The sound barrier system of the present invention combines photovoltaics, batteries 22, and DC street lamps 1, and its structural connection diagram is shown in FIG. Figure 2As shown, a DC street lamp 1 is connected to multiple sound barriers 2, and multiple sound barriers 2 are erected on the side of the DC street lamp 1. Each sound barrier 2 includes a photovoltaic panel 21 and a battery 22. The photovoltaic panel 21 is installed on the side of the sound barrier 2, and the battery 22 is installed at the bottom of the sound barrier 2. The multiple batteries 22 corresponding to the multiple sound barriers 2 are connected in series through DC cables and connected to the corresponding DC street lamp 1; the multiple photovoltaic panels 21 corresponding to the multiple sound barriers 2 are connected to the inverter 3 through the DC cable on the one hand, and connected to the corresponding battery 22 on the other hand. In addition to the installation positions of the photovoltaic panel 21 and the battery 22, each sound barrier 2 also has a sound insulation function. The lower part of the sound barrier 2 includes an electrical connection component, which reserves a channel for the DC cable on the one hand, and sets a DC cable connection terminal on the other hand, which is used to connect the electrical equipment of the sound barrier 2. The sound barrier 2 of the present invention is not only embedded with a photovoltaic panel 21, but also embedded with a battery 22. During the day, part of the DC power generated by the photovoltaic panel 21 is stored in the battery 22, and part is sent to the municipal power supply 5 through the inverter 3 and the grid cabinet 4; at night, the battery 22 supplies power to the DC street lamp 1. The DC street lamp 1 adopts DC input and directly acts on the terminal light-emitting device, eliminating the need for an AC-DC conversion power supply. The DC street lamp 1 is powered by a battery 22 connected thereto using a DC cable, which eliminates the need for lengthy AC cables compared to the existing municipal power supply method. In the system of the present invention, the photovoltaic panel 21 stores a lot of electrical energy in the battery 22, thereby reducing the capacity of the inverter 3 and reducing the failure rate of the inverter 3. If the photovoltaic panel 21 generates insufficient power during continuous rainy weather, the battery 22 will be insufficiently charged. At night, the municipal power supply 5 supplies power to the DC street lamp 1 through the inverter 3. At this time, the municipal power supply 5 serves as an emergency power supply for the DC street lamp 1. The front end of the inverter 3 is a DC cable, and the rear end is an AC cable, which reduces the complexity of cable laying and saves construction time during the construction phase.

[0035] The battery 22 can also be used as an energy storage element for peak shaving and valley filling to achieve flexible output of the photovoltaic power generation system. For the shorter nights in summer, the battery 22 will inevitably have redundancy in addition to the power of the street lamps, and can also be used to smooth the power output. The battery 22 has its own controller, which can predict the power generation curve, store energy at peak times, and reduce the peak power generation; discharge at low times to increase power generation. By shaving the peak and filling the valley, the power generation curve of the system is smoothed. The capacity of the battery 22 should not be configured too high or too low. Too high is not conducive to cost control, and too low cannot meet the function. The capacity of the battery 22 for each sound barrier 2 is determined as follows:

[0036] W b =kTP / n

[0037] Where: W b is the capacity of the battery 22 of each sound barrier 2, in kWh;

[0038] k is the redundancy coefficient, which is determined according to the working characteristics of the battery 22, redundancy in rainy weather, etc.;

[0039] T is the length of night on the local winter solstice, in hours;

[0040] P is the power of each DC street lamp 1, in kW;

[0041] n is the number of sound barriers 2 corresponding to each DC street lamp 1.

[0042] like Figure 3 The figure shows a flow chart of the energy storage battery of the sound barrier system supplying power to the DC street lamp 1. A working method of the sound barrier system is as follows:

[0043] S1: Determine whether it is night, when night comes, the DC street lamp 1 automatically lights up, and the battery 22 starts to supply power to the DC street lamp 1;

[0044] S2: Determine the power W of the battery 22 b1 Is it sufficient? If the voltage is sufficient, the battery 22 continues to be DC

[0045] Power supply for street lamp 1; power W b1 The calculation is shown in formula (2):

[0046] W b1 =kt1P / n (2)

[0047] Where: W b1 is the battery capacity of each sound barrier that night, in kWh;

[0048] t1 is the length of the local night on that day, in hours;

[0049] S3: The voltage of the battery 22 is insufficient, and the municipal power supply 5 supplies power to the battery 22 through the inverter 3, and the battery 22 then supplies power to the DC street lamp 1. At this time, the municipal power supply 5 serves as an emergency power supply, generating electricity costs;

[0050] S4: Determine whether it is daybreak, when it is daybreak, the DC street lamp 1 automatically turns off, and the battery 22 automatically stops supplying power, and continues to supply power before daybreak;

[0051] S5: After daybreak, determine the current power W of the battery 22 b2 Is it greater than 0, W b2 >0, the electricity is sent to the grid through the inverter 3. At this time, the battery 22 is used as a power generation device to generate electricity sales income;

[0052] W b2 =W b1 -t1P / n (3).

[0053] like Figure 4The diagram shows the battery energy storage process flow chart. The method of storing energy in the battery 22 is as follows:

[0054] Step 1: The battery 22 controller predicts the photovoltaic power generation curve according to local weather conditions;

[0055] Step 2: Determine whether it is the peak power generation period, if yes, the battery 22 stores energy;

[0056] Step 3: Determine the battery 22 power W b3 Can it meet the power demand of DC street lamp 1 that night? Otherwise, continue to store energy; if yes, proceed to step 4; the power W b3 Satisfying formula (4):

[0057] W b3 >W b1 (4);

[0058] Step 4: The controller of the battery 22 obtains the peak and valley electricity price information and determines whether the real-time electricity price is the peak electricity price. If so, the surplus electricity is sold to the grid and the energy storage ends after the electricity is sold. Otherwise, the energy storage ends directly.

[0059] The storage battery 22 predicts the photovoltaic power generation curve according to the local weather conditions, stores energy during the peak power generation period, and reduces the power generation peak; on the premise of ensuring that the stored power meets the power demand of the DC street lamp 1 that night, the surplus power is sold online at the peak power price to achieve the greatest economic benefits.

[0060] If energy storage is not considered in traditional photovoltaic power generation systems, the phenomenon of abandoned light may occur; if energy storage is considered, it is usually considered uniformly on the AC side of the system, which not only causes energy loss, but also occupies additional land; in addition, it is particularly uneconomical to set up energy storage in a centralized manner in small projects. The photovoltaic panel 21 of the system of the present invention generates electricity during the day, and the DC street lamp 1 is lit at night, so the battery 22 is the energy medium between the two. On the one hand, the method of the present invention saves costs, the electricity is sufficient for the street lamp in normal weather conditions, and the electricity can be sold to the power grid; on the other hand, it ensures the function of the equipment, and the municipal power supply 5 can be used as an emergency power supply when the power generation is insufficient in continuous rainy weather. The front end of the system is all DC power supply, and the power is generated and used locally; the back end of the system is all AC power supply, so that photovoltaic and energy storage equipment can sell electricity to the power grid. The design of this system saves non-ferrous metals to the maximum extent, which is conducive to energy conservation, emission reduction and cost reduction. In the project using this system, several modules can be used to complete the electrical design and construction. Each module contains a photovoltaic panel 21, a battery 22 and a DC street lamp 1. The close distance between the three is not only conducive to reducing power loss, but also convenient for modular construction. In summary, the solution of the present invention not only saves equipment costs but also improves energy utilization efficiency.

Claims

1. A sound barrier system, characterized in that: The invention comprises a DC street lamp (1), wherein the DC street lamp (1) is connected to a plurality of sound barriers (2), wherein each sound barrier (2) comprises a photovoltaic panel (21) and a storage battery (22), wherein the photovoltaic panel (21) is connected to the storage battery (22) on one hand, and is connected to a grid cabinet (4) through an inverter (3) on the other hand, and the grid cabinet (4) is connected to a municipal power supply (5); while the storage battery (22) receives the electric energy from the photovoltaic panel (21), it can also receive the electric energy from the grid cabinet (4) through the inverter (3), and the storage battery (22) is connected to the DC street lamp (1) to provide the latter with electric energy; the photovoltaic panel (21), the storage battery (22) and the DC street lamp (1) are connected in series through a DC cable, the photovoltaic panel (21) and the inverter (3), and the storage battery (22) and the inverter (3) are connected through a DC cable, and the inverter (3), the grid cabinet (4) and the municipal power supply (5) are connected through an AC cable.

2. The sound barrier system according to claim 1, characterized in that: The storage battery (22) is determined by its capacity, and the capacity is determined as follows: W b =kTP / n, Where: W b is the capacity of the battery (22) of each sound barrier, in kWh; k is the redundancy factor, which is determined based on the working characteristics of the battery (22), redundancy in rainy weather, etc.; T is the length of the night on the local winter solstice, in h; P is the power of each DC street lamp (1), in kW; n is the number of sound barriers (2) corresponding to each DC street lamp (1).

3. A working method of a sound barrier system, characterized in that: The following steps are included: S1: determining whether it is night, when night comes, the DC street lamp (1) automatically lights up, and at this time, the storage battery (22) starts to supply power to the DC street lamp (1); S2: Determine the power level W of the battery (22) b1 Is it sufficient? If the voltage is sufficient, the battery (22) continues to supply power to the DC street lamp (1); the power W b1 The calculation is as follows: W b1 =kt1P / n Where: W b1 is the battery capacity of each sound barrier that night, in kWh; t1 is the length of the local night on that day, in hours; S3: The voltage of the storage battery (22) is insufficient, and the municipal power supply (5) transmits power to the storage battery (22) through the inverter (3), and the storage battery (22) then supplies power to the DC street lamp (1). At this time, the municipal power supply (5) serves as an emergency power supply, generating electricity charges; S4: determining whether it is daybreak, when it is daybreak, the DC street lamp (1) automatically turns off, and the storage battery (22) automatically stops supplying power, and continues to supply power before daybreak; S5: After daybreak, determine the battery (22) current power W b2 Is it greater than 0, W b2 >0, the electricity is sent to the grid through the inverter (3), and the storage battery (22) is used as a power generation device to generate electricity sales income; W b2 =W b1 -t1P / n。 4. The working method of the sound barrier system according to claim 3, characterized in that: The working process of the battery (22) for energy storage is as follows: Step 1: The battery (22) controller predicts the photovoltaic power generation curve according to local weather conditions; Step 2: determine whether it is the peak power generation period, if yes, store energy in the battery (22); Step 3: Determine the battery (22) power W b3 Can it meet the power demand of DC street lamp (1) that night? If not, continue to store energy. If yes, proceed to step 4. The power W b3 Satisfy the following formula: IN b3 >In b1 ; Step 4: The battery (22) controller obtains peak and valley electricity price information and determines whether the real-time electricity price is the peak electricity price. If so, the surplus electricity is sold to the grid and the energy storage ends after the electricity is sold. Otherwise, the energy storage ends directly.

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