A DC peak shaving and valley filling system, device and method

Abstract

The present application relates to a direct current peak shaving and valley filling system, device and method. The system includes a battery unit, an AC / DC rectifier unit, a direct current peak shaving and valley filling device and a direct current load module. The direct current peak shaving and valley filling device controls the timing of the AC / DC rectifier unit supplying power to the direct current load module, the battery unit supplying power to the direct current load module and the battery unit charging according to a preset control timing. The system stores energy and reduces consumption by shaving peaks and valley filling on the direct current side. To implement, it only requires the modification of the direct current line without changing the original AC line of the mains power. The operation is simple, the cost is low and the installation is convenient. The system can effectively achieve peak shaving and valley filling, utilize peak shaving and valley filling to regulate the peak, and alleviate the pressure on the mains power consumption; and save electricity costs through the peak-valley electricity price difference.

Description

Technical Field

[0001] The present application relates to the technical field of electric power management, and in particular to a direct current peak shaving and valley filling system, device and method. Background Art

[0002] In recent years, in order to meet the growing communication needs and improve service quality, the number of base stations of communication operators has shown a steady growth trend. With the increase in the scale of communication base station construction and the substantial improvement of communication technology performance indicators, the entire industry faces two major problems: first, the power consumption of communication equipment has increased rapidly, and the original power supply system of the base station faces great challenges; second, the base station transformation project is large and costly. Under the policy background of "speeding up and reducing fees", operators need to invest a lot of money in construction, while maintaining a certain profit growth rate, and have a strong demand for low-cost construction.

[0003] Usually, the power consumption of communication equipment fluctuates periodically with the change of communication business volume. By using the communication load peak-shaving and valley-filling technology with backup batteries, the power "load" can be "unloaded" from the peak to the low point, which can effectively alleviate the pressure on the city power consumption. By scientifically and rationally utilizing peak and valley electricity prices, electricity costs can be effectively saved.

[0004] The currently widely used peak shaving and valley filling system is based on the grid side, and uses technologies such as bidirectional energy storage inverters, energy management systems, and battery management systems to shave peaks and fill valleys on the AC side. However, the implementation of this system is relatively complex and the cost is relatively high. Summary of the invention

[0005] Based on this, it is necessary to provide a DC peak shaving and valley filling system, device and method for storing energy and reducing consumption on the DC side, with simple system implementation and low cost, in order to address the above technical problems.

[0006] A direct current peak shaving and valley filling system comprises: a battery unit, an AC / DC rectifier unit, a direct current peak shaving and valley filling device and a direct current load module.

[0007] The DC load module is connected to the AC / DC rectifying unit and the DC peak shaving and valley filling device; the DC peak shaving and valley filling device is connected to the battery unit.

[0008] The DC peak-shaving and valley-filling device is used to control the timing of the AC / DC rectifier unit supplying power to the DC load module, the battery unit supplying power to the DC load module, and the battery unit charging according to a preset control timing.

[0009] The battery unit is used to store electric energy during off-peak hours and to supply power to the DC load module during peak hours.

[0010] The AC / DC rectifier unit is used to convert the mains electricity into direct current. When the electricity consumption is low, the AC / DC rectifier unit supplies power to the DC load module and to the battery unit.

[0011] Furthermore, it also includes: the battery unit includes a plurality of single batteries connected in series and / or in parallel.

[0012] Furthermore, it also includes: the single battery is a lead-acid battery, the battery unit is composed of 24 lead-acid battery cells connected in series, and the output voltage of the battery unit is 48V.

[0013] A direct current peak shaving and valley filling device applied to the above system comprises: a DC / DC direct current power supply conversion module and a time control module.

[0014] The input end of the DC / DC direct current power conversion module is connected to the time control module, and the output end of the DC / DC direct current power conversion module is connected to the DC load module; the other end of the time control module is connected to the battery unit.

[0015] The timing control module is used to control the power supply from the AC / DC rectifier unit to the DC load module, the power supply from the battery unit to the DC load module, and the timing of charging the battery unit according to the preset control timing.

[0016] Furthermore, it also includes: the time control module includes a first time control module and a second time control module.

[0017] The second time control module is connected to the input end of the DC / DC direct current power conversion module; the first time control module is connected in parallel to the other end of the second time control module and the output end of the DC / DC direct current conversion module.

[0018] Furthermore, it also includes: the first time control module includes a first time control switch and a first DC contactor.

[0019] The first time-controlled switch is connected to the first DC controller and is used to control the first DC contactor. The other end of the first time-controlled switch is connected to the battery unit, and the first DC contactor is connected to the AC / DC rectifier unit.

[0020] The second timing control module includes a second timing switch and a second DC contactor; the second timing switch is connected to the second DC contactor for controlling the second DC contactor; the other end of the second timing switch is connected to the battery unit, and the second DC contactor is connected to the input end of the DC / DC power conversion module.

[0021] Furthermore, it also includes: the DC peak shaving and valley filling device also includes a short circuit protection module; the circuit protection module includes: a first fuse, a second fuse, a circuit breaker, and a diode.

[0022] Between one end of the first fuse and the front end of the first time control module; the other end of the first fuse is connected to one end of the first pole of the circuit breaker, and the other end of the first pole of the circuit breaker is connected to the positive pole of the battery unit.

[0023] One end of the second fuse is connected to the negative pole of the input end of the DC / DC direct current power conversion module; the other end of the second fuse is connected to one end of the second pole of the circuit breaker, and the other end of the second pole of the circuit breaker is connected to the negative pole of the battery unit.

[0024] The anode of the diode is connected to the positive electrode of the AC / DC rectifying unit, the cathode of the diode is connected to the DC load module, and the diode is used to prevent current backflow.

[0025] Furthermore, the device further includes an anti-reverse diode module, an anode of the anti-reverse diode module is connected to the front end of the first timing control module, and a cathode of the anti-reverse diode module is connected to the rear end of the first timing control module.

[0026] The anti-reverse diode module is used to supply power to the DC load module from the battery unit when the first timing control module and the second timing control module are disconnected at the same time or the city power is cut off.

[0027] A direct current peak shaving and valley filling method, the method comprising:

[0028] The AC / DC rectifier unit is used to convert the alternating current into a direct current voltage, and the direct current voltage is used to supply power to a direct current load module or to charge a storage battery unit.

[0029] Get the preset charge and discharge time control sequence and current time value.

[0030] The control sequence of the timing control module is set according to the charge and discharge time control sequence.

[0031] The timing of the time control module determines the time period in which the current time value is located to obtain a determination result.

[0032] When the judgment result is a peak period of electricity consumption, a peak period or a peak period, the AC / DC rectifier unit stops supplying power to the DC load module, and the battery unit supplies power to the DC load module;

[0033] When the judgment result is a valley period, the AC / DC rectifier unit supplies power to the DC load module and charges the battery unit.

[0034] In one embodiment, the method further includes: when the city power fails or the time control module fails, the battery unit supplies power to the DC load module.

[0035] The above-mentioned DC peak shaving and valley filling system, device and method, the system includes: a battery unit, an AC / DC rectifier unit, a DC peak shaving and valley filling device and a DC load module. The DC peak shaving and valley filling device is used to control the timing of the AC / DC rectifier unit supplying power to the DC load module, the battery unit supplying power to the DC load module and the battery unit charging according to a pre-set control timing. The system stores energy and reduces consumption by shaving peaks and valley filling on the DC side. To implement, it only needs to modify the DC line without changing the original AC line of the mains. The operation is simple, the cost is low and the installation is convenient. The system can effectively achieve peak shaving and valley filling, and use peak shaving and valley filling to regulate the peak and alleviate the pressure on the mains electricity consumption; through the peak-valley electricity price difference, the electricity cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A block diagram of a DC peak shaving and valley filling system in one embodiment;

[0037] Figure 2 It is a schematic diagram of the structure of a DC peak shaving and valley filling device in one embodiment;

[0038] Figure 3 A diagram showing the composition of a DC peak shaving and valley filling system in one embodiment;

[0039] Figure 4 FIG. 4 is a flow chart of a DC peak shaving and valley filling method in another embodiment. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] In addition, in the invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] In one embodiment, Figure 1 As shown, a DC peak shaving and valley filling system is provided, and the system includes: a battery unit 100, an AC / DC rectifier unit 102, a DC peak shaving and valley filling device 104 and a DC load module 106.

[0045] The DC load module 106 is connected to the AC / DC rectifier unit 102 and the DC peak-shaving and valley-filling device 104 ; the DC peak-shaving and valley-filling device 104 is connected to the battery unit 100 .

[0046] The DC peak-shaving and valley-filling device 104 is used to control the timing of the AC / DC rectifier unit 102 supplying power to the DC load module 106, the battery unit 100 supplying power to the DC load module 106, and charging the battery unit 100 according to a preset control timing.

[0047] The battery unit 100 is used to store electric energy during off-peak hours and to supply power to the DC load module 106 during peak hours.

[0048] The AC / DC rectifier unit 102 is used to convert the city power into direct current. When the power consumption is low, the AC / DC rectifier unit 102 supplies power to the DC load module 106 and to the battery unit 100 .

[0049] In one embodiment, the DC load module 106 is a base station communication device, such as an antenna, a BBU, an RRU, and the like.

[0050] In one embodiment, the DC output voltage value of the AC / DC rectifier unit 102 is 53.2V.

[0051] The preset control sequence is generated after statistical analysis based on the electricity consumption patterns and power consumption of different users, and determining the peak, flat, peak and valley periods.

[0052] In the above system, the system includes: a battery unit, an AC / DC rectifier unit, a DC peak shaving and valley filling device, and a DC load module. The DC peak shaving and valley filling device is used to control the timing of the AC / DC rectifier unit supplying power to the DC load module, the battery unit supplying power to the DC load module, and the battery unit charging according to a preset control sequence. The system stores energy and reduces consumption by shaving peaks and filling valleys on the DC side. To implement, it only requires the transformation of the DC line without changing the original AC line of the mains. The operation is simple, the cost is low, and the installation is convenient. The system can effectively achieve peak shaving and valley filling, utilize peak shaving and valley filling to regulate the peak, and alleviate the pressure on the mains electricity consumption; through the peak-valley electricity price difference, the electricity cost is saved.

[0053] Preferably, the battery unit includes a plurality of single batteries connected in series and / or in parallel.

[0054] In one embodiment, the battery unit includes a plurality of single batteries connected in series, and the plurality of single batteries connected in series increase the total voltage.

[0055] In another embodiment, the battery unit is composed of 48 single batteries, 24 single batteries are divided into two groups, 24 in each group, the 24 battery cells in each group are connected in series, and then the two groups of battery cells connected in series are connected in parallel. The parallel connection can increase the total current.

[0056] In another embodiment, in order to simplify the structure of the battery unit, three single storage batteries with relatively large output voltages are selected and the three single storage batteries are connected in parallel to form a battery unit.

[0057] Preferably, the single battery is a lead-acid battery, the battery unit is composed of 24 lead-acid battery cells connected in series, and the output voltage of the battery unit is 48V.

[0058] In one embodiment, the single battery in the battery unit is a lead-acid battery with a nominal voltage of 2V. A battery unit with a nominal voltage of 48V is formed by connecting 24 lead-acid battery cells in series.

[0059] In one embodiment, a DC peak shaving and valley filling device applied to the above system is provided, and the device includes: a DC / DC direct current power supply conversion module and a time control module.

[0060] The input end of the DC / DC direct current power conversion module is connected to the time control module, and the output end of the DC / DC direct current power conversion module is connected to the DC load module; the other end of the time control module is connected to the battery unit.

[0061] The timing control module is used to control the power supply from the AC / DC rectifier unit to the DC load module, the power supply from the battery unit to the DC load module, and the timing of charging the battery unit according to a preset control timing.

[0062] Preferably, the timing control module includes a first timing control module and a second timing control module.

[0063] The second time control module is connected to the input end of the DC / DC direct current power conversion module; the first time control module is connected in parallel to the other end of the second time control module and the output end of the DC / DC direct current conversion module.

[0064] In one embodiment, the timing control module includes a first timing control module TK1 and a second timing control module TK2. The front end of the second timing control module TK2 is connected in series with the positive terminal of the battery unit, and the first timing control module TK1 is connected in parallel with the front end of the second timing control module TK2 and the output end of the DC / DC direct current power conversion module.

[0065] During peak hours, the time control module TK1 is disconnected, the time control module TK2 is closed, and the battery unit supplies power to the DC load module; during low hours, the time control module TK1 is closed, the time control module TK2 is disconnected, and the AC power outputs a DC voltage through the AC / DC rectifier module to charge the battery unit. At the same time, the AC power is output through the AC / DC rectifier module to supply power to the DC load module.

[0066] Preferably, the first time control module includes a first time control switch and a first DC contactor.

[0067] The first time-controlled switch is connected to the first DC controller and is used to control the first DC contactor. The other end of the first time-controlled switch is connected to the battery unit, and the first DC contactor is connected to the AC / DC rectifier unit.

[0068] The second time control module includes a second time control switch and a second DC contactor; the second time control switch is connected to the second DC contactor and is used to control the second DC contactor; the other end of the second time control switch is connected to the battery unit, and the second DC contactor is connected to the input end of the DC / DC direct current power conversion module.

[0069] In one embodiment, the first timing control module TK1 is composed of a first timing switch K1 connected to a first DC contactor M1, and the first timing switch K1 controls the on and off of the first DC contactor M1 according to a preset control sequence; the second timing control module TK2 is composed of a second timing switch K2 connected to a second DC contactor M2, and the second timing switch K2 controls the on and off of the second DC contactor M2 according to a preset control sequence.

[0070] Preferably, the DC peak shaving and valley filling device further includes a short circuit protection module; the circuit protection module includes: a first fuse, a second fuse, a circuit breaker, and a diode.

[0071] One end of the first fuse is connected to the front end of the first time control module; the other end of the first fuse is connected to one end of the first pole of the circuit breaker, and the other end of the first pole of the circuit breaker is connected to the positive pole of the battery unit. The fuse is used for short circuit protection and overload protection of the battery unit.

[0072] One end of the second fuse is connected to the negative pole of the input end of the DC / DC direct current power conversion module; the other end of the second fuse is connected to one end of the second pole of the circuit breaker, and the other end of the second pole of the circuit breaker is connected to the negative pole of the battery unit.

[0073] The anode of the diode is connected to the positive electrode of the AC / DC rectifier unit, and the cathode of the diode is connected to the DC load module. The diode is used to prevent current backflow.

[0074] The circuit breaker is connected to the battery unit and is used to cut off and connect the load circuit, as well as cut off the fault circuit to prevent the accident from expanding and ensure safe operation.

[0075] Preferably, the DC peak shaving and valley filling device further comprises an anti-reverse diode module, the anode of the anti-reverse diode module is connected to the front end of the first timing control module, and the cathode of the anti-reverse diode module is connected to the rear end of the first timing control module.

[0076] In one embodiment, the anti-reverse diode module is connected in parallel at both ends of the timing control module TK1. When the first timing control module TK1 and the second timing control module TK2 are disconnected at the same time or the mains power is cut off, the battery unit supplies power to the DC load module through the anti-reverse diode module.

[0077] In one embodiment, Figure 2 As shown, the DC peak-shaving and valley-filling device includes a DC / DC power supply conversion module, a first time control module TK1, a second time control module TK2, an anti-reverse diode module D1, a first fuse FU1, a second fuse FU2, a circuit breaker QF and a diode D2. The first fuse FU1, the second fuse FU2, the circuit breaker QF and the diode D2 constitute a circuit protection module.

[0078] The front end of the timing control module TK2 is connected to the first fuse FU1, the other end of the first fuse FU1 is connected to the first pole of the circuit breaker QF, and the other end of the first pole of the circuit breaker QF is connected to the positive end of the battery unit; the rear end of the timing control module TK2 is connected to the input end of the DC / DC direct current power conversion module.

[0079] The timing control module TK1 and the diode D2 are connected in series and connected to the front end of the timing control module TK2 and the output end of the DC / DC direct current power conversion module; the connection point between the timing control module TK1 and the diode D2 is connected to the positive pole of the AC / DC rectifier unit.

[0080] One end of the second pole of the circuit breaker QF is connected to the negative pole of the battery unit, and the other end is connected to the second fuse FU2. The other end of the second fuse FU2 is connected to the DC / DC power conversion module and the negative pole of the AC / DC rectifier unit. The output end of the DC / DC power conversion module is connected to the DC load module.

[0081] The DC / DC direct current power conversion module is used to convert the input battery unit voltage into a fixed output voltage, and provide the obtained fixed output voltage to the DC load module; the fixed output voltage of the direct current power conversion module in this embodiment is typically 53.4V.

[0082] The anti-reverse diode module is used to enable the battery unit to supply power to the DC load module through the anti-reverse diode module when the first timing control module TK1 and the second timing control module TK2 are disconnected simultaneously due to a fault or a city power outage.

[0083] The fuse is used for short-circuit protection and overload protection of the battery unit; the circuit breaker QF selected in this embodiment is a 2P circuit breaker, and the circuit breaker QF is used to cut off and connect the load circuit, and cut off the fault circuit to prevent the accident from expanding and ensure safe operation; the diode D2 is connected in series between the output end of the rectifier unit and the DC load module to prevent current backflow.

[0084] This embodiment provides a timed charge and discharge control method, charging during off-peak hours and discharging during peak and peak hours. The control sequence is obtained by statistical analysis based on the power consumption patterns and power consumption of different users, and determining the peak, off-peak, peak, and off-peak hours. The timed charge and discharge control sequence is shown in the following table:

[0085] Peaks and valleys Time Duration (h) Planned charging (discharging) action Lows 23：00-7：00 8 Charge Pingfeng 7：00-15：00 1 none peak 15：00-19：00 4 Discharge peak 19：00-22：00 3 Discharge Pingfeng 22：00-23：00 1 none

[0086] In one embodiment, Figure 3 As shown, a DC peak shaving and valley filling system is provided, including: a peak shaving and valley filling device 300, an AC / DC rectifier unit 302, a battery unit 304 and a DC load module 306.

[0087] The peak shaving and valley filling device 300 adopts the peak shaving and valley filling device provided in the previous embodiment.

[0088] The working principle of the DC peak shaving and valley filling system: According to the electricity consumption patterns and power consumption of different users, the peak, flat, peak and valley periods are determined for statistical analysis to obtain the control timing, and the control timing of the first timing switch K1 and the second timing switch K2 in the first timing control module TK1 and the second timing control module TK2 is set according to the control timing, and the setting is completed.

[0089] The first timing control module TK1 and the second timing control module TK2 compare the current time with the control timing. When it is in the peak period or peak, the first timing control module TK1 is disconnected and the second timing control module TK2 is closed, and the battery unit supplies power to the DC load module; when it is in the valley period, the first timing control module TK1 is closed and the second timing control module TK2 is disconnected, and the AC / DC rectifier unit supplies power to the DC load module and charges the battery unit at the same time, realizing the peak shaving and valley filling function of DC measurement.

[0090] When the first time control module TK1 and the second time control module TK2 are disconnected at the same time, or the city power is cut off, the battery unit supplies power to the DC load module through the anti-reverse diode.

[0091] In one embodiment, Figure 4 A method for direct current peak shaving and valley filling is provided, the method comprising the steps of:

[0092] The AC / DC rectifier unit is used to convert the AC into a DC voltage, and the DC voltage is used to power a DC load module or charge a battery unit.

[0093] Obtain the preset charge and discharge time control sequence and the current time value; set the control sequence of the timing control module according to the charge and discharge time control sequence.

[0094] The timing of the time control module judges the time period in which the current time value is located and obtains a judgment result; when the judgment result is a peak power consumption period, a peak period or a peak period, the AC / DC rectifier unit stops supplying power to the DC load module, and the battery unit supplies power to the DC load module; when the judgment result is a valley period, the AC / DC rectifier unit supplies power to the DC load module and charges the battery unit.

[0095] In one of the embodiments, it also includes: when the city power is cut off or the time control module fails, the battery unit supplies power to the DC load module.

[0096] It should be understood that although Figure 4 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 4At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0097] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A DC peak shaving and valley filling system, characterized in that: It includes a battery unit, an AC / DC rectifier unit, a DC peak-shaving and valley-filling device, and a DC load module; The DC load module is connected to the AC / DC rectifier unit and the DC peak-shaving and valley-filling device; the DC peak-shaving and valley-filling device is connected to the battery unit; The DC peak-shaving and valley-filling device is used to control the timing of the AC / DC rectifier unit supplying power to the DC load module, the battery unit supplying power to the DC load module, and the battery unit charging according to a preset control timing; The battery unit is used to store electric energy during off-peak hours and to supply power to the DC load module during peak hours; The AC / DC rectifier unit is used to convert the mains electricity into direct current. During the off-peak period of electricity consumption, the AC / DC rectifier unit supplies power to the DC load module and to the battery unit; The DC peak shaving and valley filling device comprises: a DC / DC direct current power supply conversion module and a time control module; The input end of the DC / DC power conversion module is connected to the time control module, and the output end of the DC / DC power conversion module is connected to the DC load module; the other end of the time control module is connected to the battery unit; The timing control module is used to control the power supply from the AC / DC rectifier unit to the DC load module, the power supply from the battery unit to the DC load module, and the timing of charging the battery unit according to the preset control timing; The time control module includes a first time control module and a second time control module; The second time control module is connected to the input end of the DC / DC direct current power conversion module; the first time control module is connected in parallel to the other end of the second time control module and the output end of the DC / DC direct current conversion module; The first time control module includes a first time control switch and a first DC contactor; The first time-controlled switch is connected to the first DC contactor and is used to control the first DC contactor; the other end of the first time-controlled switch is connected to the battery unit, and the first DC contactor is connected to the AC / DC rectifier unit; The second time control module includes a second time control switch and a second DC contactor; the second time control switch is connected to the second DC contactor and is used to control the second DC contactor; the other end of the second time control switch is connected to the battery unit, and the second DC contactor is connected to the input end of the DC / DC power conversion module; The DC peak shaving and valley filling device further includes a short circuit protection module; the short circuit protection module includes: a first fuse, a second fuse, a circuit breaker, and a diode; Between one end of the first fuse and the front end of the first time control module; the other end of the first fuse is connected to one end of the first pole of the circuit breaker, and the other end of the first pole of the circuit breaker is connected to the positive pole of the battery unit; One end of the second fuse is connected to the negative electrode of the input end of the DC / DC direct current power conversion module; the other end of the second fuse is connected to one end of the second pole of the circuit breaker, and the other end of the second pole of the circuit breaker is connected to the negative electrode of the battery unit; The anode of the diode is connected to the positive electrode of the AC / DC rectifying unit, the cathode of the diode is connected to the DC load module, and the diode is used to prevent current backflow.

2. The system according to claim 1, characterized in that The battery unit includes a plurality of single batteries which are connected in series and / or in parallel with one another.

3. The system according to claim 2, characterized in that The single battery is a lead-acid battery. The battery unit is composed of 24 lead-acid battery cells connected in series. The output voltage of the battery unit is 48V.

4. The system according to claim 1, characterized in that The device further comprises an anti-reverse diode module, wherein an anode of the anti-reverse diode module is connected to a front end of the first timing control module, and a cathode of the anti-reverse diode module is connected to a rear end of the first timing control module; The anti-reverse diode module is used to supply power to the DC load module from the battery unit when the first timing control module and the second timing control module are disconnected at the same time or the city power is cut off.

5. A DC peak shaving and valley filling method, characterized in that: The method comprises: A DC peak shaving and valley filling system, including a battery unit, an AC / DC rectifier unit, a DC peak shaving and valley filling device, and a DC load module; The DC load module is connected to the AC / DC rectifier unit and the DC peak-shaving and valley-filling device; the DC peak-shaving and valley-filling device is connected to the battery unit; The DC peak-shaving and valley-filling device is used to control the timing of the AC / DC rectifier unit supplying power to the DC load module, the battery unit supplying power to the DC load module, and the battery unit charging according to a preset control timing; The battery unit is used to store electric energy during off-peak hours and to supply power to the DC load module during peak hours; The AC / DC rectifier unit is used to convert the mains electricity into direct current. During the off-peak period of electricity consumption, the AC / DC rectifier unit supplies power to the DC load module and to the battery unit; The DC peak shaving and valley filling device comprises: a DC / DC direct current power supply conversion module and a time control module; The input end of the DC / DC power conversion module is connected to the time control module, and the output end of the DC / DC power conversion module is connected to the DC load module; the other end of the time control module is connected to the battery unit; The timing control module is used to control the power supply from the AC / DC rectifier unit to the DC load module, the power supply from the battery unit to the DC load module, and the timing of charging the battery unit according to the preset control timing; The time control module includes a first time control module and a second time control module; The second time control module is connected to the input end of the DC / DC direct current power conversion module; the first time control module is connected in parallel to the other end of the second time control module and the output end of the DC / DC direct current conversion module; The first time control module includes a first time control switch and a first DC contactor; The first time-controlled switch is connected to the first DC contactor and is used to control the first DC contactor; the other end of the first time-controlled switch is connected to the battery unit, and the first DC contactor is connected to the AC / DC rectifier unit; The second time control module includes a second time control switch and a second DC contactor; the second time control switch is connected to the second DC contactor and is used to control the second DC contactor; the other end of the second time control switch is connected to the battery unit, and the second DC contactor is connected to the input end of the DC / DC power conversion module; The DC peak shaving and valley filling device further includes a short circuit protection module; the short circuit protection module includes: a first fuse, a second fuse, a circuit breaker, and a diode; Between one end of the first fuse and the front end of the first time control module; the other end of the first fuse is connected to one end of the first pole of the circuit breaker, and the other end of the first pole of the circuit breaker is connected to the positive pole of the battery unit; One end of the second fuse is connected to the negative electrode of the input end of the DC / DC direct current power conversion module; the other end of the second fuse is connected to one end of the second pole of the circuit breaker, and the other end of the second pole of the circuit breaker is connected to the negative electrode of the battery unit; The anode of the diode is connected to the positive electrode of the AC / DC rectifier unit, the cathode of the diode is connected to the DC load module, and the diode is used to prevent current backflow; The AC / DC rectifier unit is used to convert the AC into a DC voltage, and the DC voltage is used to power a DC load module or charge a battery unit; Get the preset charge and discharge time control sequence and current time value; Setting the control sequence of the timing control module according to the charge and discharge time control sequence; Determine the time period of the current time value according to the timing of the timing control module to obtain a determination result; When the judgment result is a peak period of electricity consumption, a peak period or a peak period, the AC / DC rectifier unit stops supplying power to the DC load module, and the battery unit supplies power to the DC load module; When the judgment result is a valley period, the AC / DC rectifier unit supplies power to the DC load module and charges the battery unit.

6. The method according to claim 5, characterized in that When the judgment result is a valley period, the AC / DC rectifier unit supplies power to the DC load module and charges the battery unit, and the step further includes: When the city power fails or the time control module fails, the battery unit supplies power to the DC load module.

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