A system and method for increasing capacity and stabilizing voltage of power grid outside base station

Abstract

The present invention discloses a system and method for increasing the capacity and stabilizing the voltage of a power grid outside a base station. The power grid end, the power supply line and the base station end are connected in sequence, and the system includes structure one or structure two; structure one: a boost module is connected in series between the power grid end and the power supply line; structure two: a boost module is connected in series between the power grid end and the power supply line, and a buck module is connected in series between the base station end and the power supply line; the boost module includes more than one boost unit that outputs different gear voltages, and more than one switching switch, and the corresponding boost unit is controlled by the switching switch to be connected or not connected to the power supply line. The voltage stabilization and capacity increase transformation is carried out without changing the existing external power grid line structure. Structure one ensures the working stability of the base station equipment and improves the power supply efficiency; structure two can increase the capacity and stabilize the voltage of the existing power supply network; it can switch to boost units with different voltage gears for boosting according to the load amplitude change of the base station to ensure that the base station load is not damaged by overvoltage.

Description

Technical Field

[0001] The present invention relates to the technical field of power grids outside base stations, and in particular to a capacity increasing and voltage stabilizing system and method for power grids outside base stations. Background Art

[0002] In the long-term operation of communication base stations, the load of the power grid outside the base station has increased, reducing the quality and reliability of the power supply of the base station due to the continuous increase in power load, the co-construction and sharing of multiple operators' services, the co-location of mobile communications from 2G, 3G, 4G to 5G, the optical transmission network from SDH, MSTP, PTN to F5G, and the rise of edge computing services. The current status of the external power supply introduction scenarios of communication base stations includes: due to the low initial load and high cost, the proportion of 10KV dedicated transformers in the station is low; due to the special requirements of the location of the machine room, the power supply lines of some base stations are too long (the distance from the power point to the end is greater than 1KM); unattended base stations use a large number of aluminum alloy cables for line theft prevention, and there is a problem of copper-aluminum conversion; the power supply lines of the communication room coexist with a large number of other power lines on the same poles and trenches, and the line maintenance is relatively troublesome. Therefore, how to maintain the long-term effectiveness of the power introduction line investment during the initial construction period of the base station, and minimize the power transformation investment caused by the continuous increase in load during the existence of the base station without reducing the quality and reliability of the power supply of the base station, is a problem faced by all operators. Summary of the invention

[0003] The present invention aims to at least solve the technical problems existing in the prior art, and in particular innovatively proposes a system and method for increasing the capacity and stabilizing the voltage of a power grid outside a base station.

[0004] In order to achieve the above-mentioned purpose of the present invention, according to the first aspect of the present invention, the present invention provides a base station external power grid capacity increasing and voltage stabilization system, the power grid end, the power supply line and the base station end are connected in sequence, and the system includes structure one or structure two; the structure one is: a boost module is connected in series between the power grid end and the power supply line; the structure two is: a boost module is connected in series between the power grid end and the power supply line, and a step-down module is connected in series between the base station end and the power supply line; the boost module includes more than one boost unit outputting different gear voltages, and more than one switching switch, the boost unit corresponds to the switching switch one by one, and the corresponding boost unit is controlled by the switching switch to be connected or not connected to the power supply line.

[0005] The above technical solution: This system stabilizes the voltage and increases the capacity without changing the existing external power grid line structure, maintains the long-term effectiveness of the power introduction line investment during the initial construction period of the base station, and minimizes the power transformation investment caused by the increasing load during the existence of the base station without reducing the power supply quality and reliability of the base station; Structure 1 performs voltage boosting transformation on base stations with too low input voltage to ensure the working stability of the base station equipment and maintain the power supply line without capacity expansion and transformation, which can maintain the input voltage at the base station end within a relatively high range and improve the power supply efficiency; Structure 2 can increase the capacity and stabilize the voltage of the existing power supply network to meet the current problem of increasing base station load; The boost modules in Structure 1 and Structure 2 can switch to boost units with different voltage levels for boosting according to the load amplitude changes of the base station to ensure that the base station load is not damaged by overvoltage, and maintain the voltage at the base station end within the set range, so as to achieve stable voltage input of the base station and improve the power supply quality and reliability of the external power grid.

[0006] In a preferred embodiment of the present invention, the boost module includes a boost transformer, the boost module includes a boost transformer, the boost transformer includes a primary winding and a secondary winding, the secondary winding is provided with a plurality of taps, and each tap is connected to a power supply line via a switching switch.

[0007] The above technical solution: The above boost module has a compact and simple structure, is easy to implement, and saves costs.

[0008] In a preferred embodiment of the present invention, the boost module includes a boost transformer, the boost transformer includes a winding, an input tap and a plurality of output taps are provided on the winding, and each output tap is connected to a power supply line via a switching switch.

[0009] The above technical solution: The above boost module adopts a non-isolated structure, and only one winding is needed to achieve multiple boost voltage outputs, and the structure is simpler.

[0010] In a preferred embodiment of the present invention, it includes a load detection unit for detecting load changes at the base station end and a first monitoring unit located at the power grid end, the first monitoring unit obtains an output signal of the load detection unit, and the first monitoring unit is connected to all switching switches respectively.

[0011] The above technical solution achieves the beneficial effect of automatically controlling the switch to switch to the corresponding boost unit according to the load change at the base station end.

[0012] In a preferred embodiment of the present invention, it also includes a first communication unit located at the power grid end, a second communication unit located at the base station end, and a second monitoring unit; the first monitoring unit is connected to the first communication unit, the first communication unit is connected to the second communication unit, the second communication unit is connected to the second monitoring unit, and the second monitoring unit is also connected to the load detection unit.

[0013] In the above technical solution, the output signal of the load detection unit is transmitted to the first monitoring unit through the second monitoring unit, the second communication unit and the first communication unit, thereby realizing information interaction between the power grid end and the base station end.

[0014] In a preferred embodiment of the present invention, it also includes all or part of the first voltage detection unit, the first current detection unit, the first power unit, the first power detection unit, and the first display unit located at the power grid end, and the first voltage detection unit, the first current detection unit, the first power unit, the first power detection unit, and the first display unit are respectively connected to the first monitoring unit.

[0015] The above technical solution is convenient for real-time detection of electrical parameters such as voltage, current, quantity, power, etc. at the power-taking end, and is convenient for remote electricity meter reading and electricity fee auditing.

[0016] In a preferred embodiment of the present invention, it also includes all or part of a third voltage detection unit, a third current detection unit, a third power unit, and a third electric quantity detection unit arranged at one end of the power supply line close to the boost module, and the third voltage detection unit, the third current detection unit, the third power unit, and the third electric quantity detection unit are respectively connected to the first monitoring unit.

[0017] The above technical solution can be combined with the current, voltage, electricity and power detection units at the power grid and base station ends to determine whether there is electricity theft or leakage, or to issue a real-time alarm when the impedance of the external power grid line changes significantly, thereby preventing electrical safety accidents from occurring in the base station power introduction line.

[0018] In a preferred embodiment of the present invention, it also includes all or part of a second voltage detection unit, a second current detection unit, a second power unit, a second power detection unit, and a second display unit located at the base station end, and the second voltage detection unit, the second current detection unit, the second power unit, the second power detection unit, and the second display unit are respectively connected to the second monitoring unit.

[0019] The above technical solution can collect the current, voltage and power of the power consumption end in real time, which is convenient for accumulating the power consumption and realizing the remote power consumption meter reading. It is conducive to realizing the alarm functions such as abnormal terminal voltage value, abnormal voltage drop in the line section, abnormal current at both ends of the line, abnormal ratio of real-time voltage drop and current in the line section (line impedance R), and abnormal real-time power fluctuation.

[0020] In a preferred embodiment of the present invention, an AC input circuit breaker and an AC output circuit breaker are respectively connected in series at the power input port and the power output port at the grid end; and / or an AC input circuit breaker and an AC output circuit breaker are respectively connected in series at the power input port and the power output port at the base station end.

[0021] The above technical solution protects the power grid and base station equipment and avoids damage to the equipment due to overvoltage and overcurrent.

[0022] In a preferred embodiment of the present invention, an output control switch for controlling the base station load to be powered on or off is provided at the base station end, and the output control switch is connected to the second monitoring unit.

[0023] The above technical solution: realizes the configuration of an intelligent boost device with an intelligent switch, and combines the first voltage detection unit, the first current detection unit, the first power unit, the first electrical quantity detection unit, the second voltage detection unit, the second current detection unit, the second power unit, and the second electrical quantity detection unit to cut off the base station load and protect the load when the terminal voltage value is abnormal, the line section voltage drop is abnormal, the current at both ends of the line is abnormal, the real-time voltage drop and current ratio of the line section (line impedance R) is abnormal, and the real-time power fluctuation is abnormal.

[0024] In a preferred embodiment of the present invention, a soft start module is further included, and the soft start module adopts structure A or structure B; the structure A is: the soft start module includes a first electromagnetic switch and a first resistor, the first electromagnetic switch includes a first coil, and a first normally open contact switch and a second normally open contact switch that are linked, the first normally open contact switch is connected in series to the connection path between the grid end and the input end of the boost module, the second normally open contact switch is connected in series to the output path of the boost module, the first resistor is connected in parallel to the two ends of the first normally open contact switch, and the two ends of the first coil are respectively connected to the input end of the boost module and the system common end; the structure B is: the soft start module includes the first electromagnetic switch, the second electromagnetic switch and a first resistor, the first electromagnetic switch includes a first coil, and a first normally open contact switch and a second normally open contact switch that are linked, the second electromagnetic switch includes a second coil and a third normally open contact switch; the first normally open contact switch is connected in series to the connection path between the power grid end and the input end of the boost module, the first resistor is connected in parallel to both ends of the first normally open contact switch, the two ends of the first coil are respectively connected to the input end of the boost module and the system common end, the third normally open contact switch is connected in series to the output path of the boost module, the first end of the second normally open contact switch is connected to the input end of the boost module, the second end of the second normally open contact switch is connected to the first end of the second coil, and the second end of the second coil is connected to the system common end.

[0025] The above technical solution adopts a hardware soft start solution with a relatively simple structure, which saves costs, realizes smooth starting of the boost module, reduces starting current, avoids starting overcurrent, and improves system reliability; in addition, structure A has the characteristics of simple structure and low cost, and structure B has the characteristics of two-level slow starting and higher safety.

[0026] In order to achieve the above-mentioned object of the present invention, according to the second aspect of the present invention, the present invention provides a method for increasing the capacity and stabilizing the voltage of the power grid outside the base station, comprising: obtaining the input voltage V1 of the current base station end; according to the current carrying capacity of the power supply line and whether the base station needs to be increased in capacity, the power grid outside the base station is transformed according to step S1 or step S2 or step S3; in step S1, when the base station is an existing base station and V1≤V τ When the structure 1 of the present invention is used to carry out voltage stabilization transformation of the external power grid, V τ Indicates the first input threshold of the base station end; Step S2, when the base station needs to be increased in capacity, the base station load capacity is increased to N times of the original load, and the external power grid power supply line can increase the circulating current, the structure 1 or the structure 2 of the present invention is used to increase the capacity of the external power grid and stabilize the voltage: When the structure 1 is used, the target input voltage V3 of the base station end after the transformation is pre-set, and the output voltage V of the boost module in the structure 1 is: V0 represents the actual output voltage value of the power grid; the current flowing through the power supply line after capacity expansion is I1 represents the current flowing in the power supply line before capacity increase; when structure 2 is adopted, the output voltage V of the boost module in structure 2 should satisfy: η represents the efficiency of the boost module and the buck module in the second structure at the same time, and N2 represents the multiple of the current flowing through the power supply line after the base station capacity is increased compared to that before the capacity is increased; Step S3, when the base station needs to be increased in capacity, the base station load is increased in capacity to N times the original load, and the external power grid power supply line cannot increase the current flowing through, the second structure of the present invention is used to increase the capacity of the external power grid and perform voltage stabilization transformation, and the output voltage V of the boost module in the second structure should satisfy: Wherein, η represents the efficiency of the boost module in structure 2; N≥1.

[0027] The above technical solution: This method configures the optimal external power grid transformation structure according to the voltage at the input end of the base station before the external power grid transformation, whether the base station needs to be increased in capacity, and the current carrying capacity of the external power grid power supply line (i.e., whether it can still withstand more current), and performs voltage stabilization and capacity increase without changing the existing external power grid line structure, thereby maintaining the long-term effectiveness of the power introduction line investment during the initial construction period of the base station, and minimizing the power transformation investment caused by the continuous increase in load during the existence of the base station without reducing the power supply quality and reliability of the base station; step S1 realizes the voltage stabilization transformation of the external power grid while keeping the energy consumption at the power grid end unchanged, which can improve the overall power supply efficiency at the power grid end and the stability of the input voltage of the base station; step S2 realizes the voltage stabilization and capacity increase of the external power grid when the current flowing in the power supply line is allowed to increase; step S3 realizes that under the premise of increasing the capacity of the base station, the current flowing in the power supply line can be kept basically consistent with that before the capacity increase, and at the same time stabilizes the input voltage of the base station.

[0028] In a preferred embodiment of the present invention, in step S1, the following inequality group is used to obtain Wherein, V3 represents the target input voltage of the base station after transformation; η represents the efficiency of the boost module in structure 1; V p Indicates the withstand voltage value of the base station equipment.

[0029] The above technical solution: V obtained by solving the above inequality τ , which can ensure that the energy consumption of the power grid remains unchanged after the voltage boost and the input voltage at the base station input end will be lower than the withstand voltage of the base station equipment, thereby improving system safety.

[0030] In a preferred embodiment of the present invention, in step S2, when V1<V0η 2 When the capacity of the external power grid is increased and the voltage is stabilized, the second structure is adopted, and the current flowing through the power supply line after the capacity increase of the base station should be a multiple of N2 compared with that before the capacity increase:

[0031] The above technical solution can ensure that the overall power supply efficiency of the power grid remains unchanged before and after the transformation.

[0032] In a preferred embodiment of the present invention, after the external power grid is transformed according to the structure 1 or the structure 2, it also includes a step-by-step power-on step or a direct power-on step, and / or a voltage stabilization step; the step-by-step power-on step includes: step 1, assuming that the input voltage allowable range of the base station power supply terminal is V A ~V AM According to the number M of boost units in the boost module, the base station power supply input voltage allowable range is divided into the following M level intervals from small to large: (V A , V A1 )、(V A1 , V A2)、......、(V A(M-1) , V AM ), V A <V A1 <V A2 ......<V A(M-1) <V AM ; The M level intervals arranged from small to large correspond to the M boost units arranged from large to small output voltages one by one; step two, obtaining the voltage at the power supply input end of the base station before the transformation, recorded as the first voltage; step three, switching the boost units step by step in the order of output voltage from small to large to connect to the power supply line until switching to the boost unit corresponding to the level interval to which the first voltage belongs, connecting to the base station load, M is greater than or equal to 1; the direct power-on step includes: connecting the boost unit with an input-output voltage ratio of 1:1 in the boost module to the power supply line, connecting to the base station load, obtaining the voltage at the power supply input end of the base station, recorded as the third voltage; based on the third voltage, according to step S1 or step S2 or step S3, obtaining the target output voltage of the boost module, and connecting the boost unit whose output voltage is closest to the target output voltage of the boost module to the power supply line; the voltage stabilization step includes: step four, obtaining the base station power supply input The real-time voltage of the base station power supply input terminal is obtained by converting the real-time voltage of the base station power supply input terminal under the current load before the transformation, and the real-time voltage of the base station power supply input terminal is obtained by converting the real-time voltage of the base station power supply input terminal to obtain the voltage of the base station input terminal before the transformation under the current load, which is recorded as the second voltage; step five, cutting off the base station load, switching the boost unit step by step in the order of output voltage from small to large to connect to the power supply line until switching to the boost unit corresponding to the level interval to which the second voltage belongs, and connecting to the base station load; or the voltage stabilization step includes: step four, obtaining the real-time voltage of the base station power supply input terminal, when the real-time voltage of the base station power supply input terminal is within the preset regulated voltage range, returning to step four, when the real-time voltage of the base station power supply input terminal is not within the preset regulated voltage range, obtaining the input-output voltage ratio of the boost module to 1:1 The voltage at the power supply input end of the base station after the boost unit is connected to the power supply line is recorded as the second voltage; step five, cutting off the base station load, obtaining the target output voltage of the boost module based on the third voltage according to step S1 or step S2 or step S3, connecting the boost unit whose output voltage is closest to the target output voltage of the boost module to the power supply line, and connecting to the base station load.

[0033] The above technical solution: realizes M selectable boost gears, realizes step-by-step boosting through step-by-step power-on steps, avoids overshoot and damage to equipment due to too large a boost span, and improves safety; and realizes direct boosting through direct power-on steps. Since the switching between boost units is after the base station load is connected, it will not cause too much overshoot, which ensures safety while speeding up the switching speed; through the voltage stabilization step, when the load size at the computer room end changes to a certain extent, causing the voltage at the computer room end to exceed the limit, the load can be cut off immediately and switched to the corresponding boosting level step by step or directly, ensuring that the load in the computer room is not damaged by overvoltage, and maintaining the voltage at the computer room end within the set range, further improving the power safety of base station equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a structural schematic diagram of structure 1 in a specific implementation manner of the present invention;

[0035] Figure 2 is a structural schematic diagram of structure 1 in another specific implementation manner of the present invention;

[0036] Figure 3 It is a structural schematic diagram of structure 2 in a specific implementation manner of the present invention;

[0037] Figure 4 is the overall power supply efficiency test result using structure 1 in step S1 in a specific implementation manner of the present invention;

[0038] Figure 5 is the overall power supply efficiency test result of structure 1 in step S2 in a specific implementation manner of the present invention;

[0039] Figure 6 is the overall power supply efficiency test result of structure 2 in step S3 in a specific implementation manner of the present invention;

[0040] Figure 7 2 is a schematic diagram of a structure in which a soft start module adopts structure A in a specific embodiment of the present invention;

[0041] Figure 8 It is a structural diagram of a soft start module adopting structure B in a specific implementation manner of the present invention. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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 a limitation on the present invention.

[0044] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0045] The present invention discloses a base station external power grid capacity increasing and voltage stabilizing system, wherein a power grid end, a power supply line and a base station end are connected in sequence, and the system comprises a structure 1 or a structure 2; the structure 1 is as follows: Figure 1 and Figure 2 As shown, specifically: a boost module is connected in series between the power grid end and the power supply line; Structure 2 is as shown Figure 3 As shown, specifically: a boost module is connected in series between the power grid end and the power supply line, and a buck module is connected in series between the base station end and the power supply line; the boost module includes one or more boost units that output different gear voltages, and one or more switching switches, the boost units correspond to the switching switches one by one, and the corresponding boost units are controlled by the switching switches to be connected or not connected to the power supply line.

[0046] In this embodiment, the power supply line is preferably, but not limited to, a DC power supply line, a 220V AC power supply line, or a 380V three-phase power supply line; when the power supply line is a DC power supply line, the input part of the boost module further includes an inverter for converting DC into AC, and the output part of the buck module further includes a rectifier for converting AC into DC; when the power supply line is a 380V three-phase power supply circuit, each boost unit includes three sub-boost units, which are respectively located on three phase lines, and the buck module includes three bucks, which are respectively located on three phase lines. The sub-boost unit is preferably, but not limited to, a boost transformer.

[0047] In this embodiment, the switching switch is preferably, but not limited to, a manual switch or an electric control switch. When it is a manual switch, a booster unit with a suitable voltage level can be selected to connect to the power supply line according to the load fluctuation of the base station. When the power supply line is a 380V three-phase power supply line, the switching switch is preferably, but not limited to, including three linked single-pole single-throw sub-switches, and the three linked sub-switches enable the sub-boosting units of the three phase lines to be connected to or not connected to the power supply line 1 at the same time.

[0048] In this embodiment, the boost unit is preferably but not limited to an existing boost transformer product, and the buck module is preferably but not limited to an existing buck transformer product. The boost ratio of the boost unit may include 1:1, 1:2, 1:1.5, etc.

[0049] In this embodiment, preferably, the boost module includes a boost transformer, the boost transformer includes a primary winding and a plurality of secondary windings with different numbers of turns, the secondary windings correspond to the switching switches one by one, and a switching switch corresponding to the secondary winding is connected in series in the connection path between the output end of each secondary winding and the power supply line. In this embodiment, each secondary winding can be regarded as a voltage dividing unit.

[0050] In a preferred embodiment, the boost module includes a boost transformer, the boost transformer includes a primary winding and a secondary winding, a plurality of taps are provided on the secondary winding, each tap is connected to the power supply line via a switching switch, and in this embodiment, each tap part can be regarded as a boost unit. In a specific implementation, the low-level end of the secondary winding can be connected to the common end of the power supply line as a common end, each tap of the secondary winding is connected to the non-common end of the power supply line, and a switching switch is connected in series on each connection path.

[0051] In a preferred embodiment, the boost module includes a boost transformer, which includes a winding, an input tap and a plurality of output taps are provided on the winding, and each output tap is connected to a power supply line via a switching switch.

[0052] In a preferred embodiment, a load detection unit for detecting load changes at the base station end and a first monitoring unit at the power grid end are included, the first monitoring unit obtains an output signal of the load detection unit, and the first monitoring unit is connected to all switches respectively. The switch is preferably, but not limited to, an IGBT tube or a relay.

[0053] In this embodiment, preferably, the load change of the base station can be obtained by detecting the voltage amplitude change at the power supply input end of the base station or the power supply current amplitude in the power supply line. The two are negatively correlated. The larger the load in the machine room, the lower the voltage and the larger the current. The smaller the load, the higher the voltage and the smaller the current. Therefore, the load detection unit is preferably, but not limited to, a voltage sensor or a current sensor. The current sensor is preferably, but not limited to, a FULLKON model FK-DJI single-phase AC current transmitter, which is a small-aperture 0 to 100A AC current transmitter. The output signal can be a 0-5V voltage analog signal or a serial port output digital signal, etc. When the load detection unit is a current sensor, the load detection unit can be set at the power grid end. The voltage sensor is preferably, but not limited to, a FULLKON model FK-DZV-250V AC voltage transmitter. The output signal can be a 0-5V voltage analog signal or a serial port output digital signal, etc.

[0054] In this embodiment, the first monitoring unit and the load detection unit may be directly connected or indirectly connected, and may be wired or wirelessly connected.

[0055] In a preferred embodiment, it also includes a first communication unit located at the power grid end, a second communication unit located at the base station end, and a second monitoring unit; the first monitoring unit is connected to the first communication unit, the first communication unit is connected to the second communication unit, the second communication unit is connected to the second monitoring unit, and the second monitoring unit is also connected to the load detection unit.

[0056] In this embodiment, the first communication unit and the second communication unit are preferably, but not limited to, wired communication modules or wireless communication modules, the wired communication module is preferably, but not limited to, RS485 communication or Ethernet communication module or power carrier communication unit, and the wireless communication module is preferably, but not limited to, 5G communication module, WIFI communication module or 433MHz wireless communication module. The first monitoring unit and the second monitoring unit are preferably, but not limited to, single-chip microcomputers, ARMs, etc.

[0057] In a preferred embodiment, it also includes all or part of the first voltage detection unit, the first current detection unit, the first power unit, the first power detection unit, and the first display unit located at the grid end, and the first voltage detection unit, the first current detection unit, the first power unit, the first power detection unit, and the first display unit are respectively connected to the first monitoring unit.

[0058] In a preferred embodiment, it also includes all or part of the second voltage detection unit, the second current detection unit, the second power unit, the second power detection unit, and the second display unit located at the base station end, and the second voltage detection unit, the second current detection unit, the second power unit, the second power detection unit, and the second display unit are respectively connected to the second monitoring unit.

[0059] In a preferred embodiment, it also includes all or part of a third voltage detection unit, a third current detection unit, a third power unit, and a third power detection unit arranged at one end of the power supply line close to the boost module, and the third voltage detection unit, the third current detection unit, the third power unit, and the third power detection unit are respectively connected to the first monitoring unit.

[0060] In a preferred implementation, an AC input circuit breaker and an AC output circuit breaker are respectively connected in series to the power input port and the power output port at the grid end.

[0061] In a preferred implementation, an AC input circuit breaker and an AC output circuit breaker are respectively connected in series to the power input port and the power output port of the base station.

[0062] In a preferred embodiment, an output control switch for controlling the base station load to be powered on or off is provided at the base station end, and the output control switch is connected to the second monitoring unit.

[0063] In this embodiment, when the second monitoring unit learns that the base station load is over-voltage or over-current according to the second voltage detection unit and the second current detection unit, it can control the output control switch to cut off the base station load in time.

[0064] In a preferred implementation, a soft start module is further included, and the soft start module adopts structure A or structure B.

[0065] In this embodiment, if Figure 7 As shown, structure A is: the soft start module includes a first electromagnetic switch and a first resistor, the first electromagnetic switch includes a first coil, and a first normally open contact switch and a second normally open contact switch that are linked, the first normally open contact switch is connected in series to the connection path between the power grid end and the input end of the boost module, the second normally open contact switch is connected in series to the output path of the boost module, the first resistor is connected in parallel to both ends of the first normally open contact switch, and the two ends of the first coil are respectively connected to the input end of the boost module and the system common end. When the power grid end initially supplies power to the boost module, the power grid end current supplies power to the first coil through the first resistor R1, and the current is limited by the first resistor R1. After the first coil is energized, the first normally open contact switch and the second normally open contact switch are controlled to close. After the first normally open contact switch is closed, the first resistor R1 is short-circuited, so that the power grid end can supply power to the boost module normally and the voltage module can output normally, and the soft start process of the voltage module is completed.

[0066] In this embodiment, if Figure 8As shown, structure B is: the soft start module includes a first electromagnetic switch, a second electromagnetic switch and a first resistor, the first electromagnetic switch includes a first coil, and a first normally open contact switch and a second normally open contact switch that are linked, and the second electromagnetic switch includes a second coil and a third normally open contact switch; the first normally open contact switch is connected in series to the connection path between the power grid end and the input end of the boost module, the first resistor is connected in parallel to the two ends of the first normally open contact switch, the two ends of the first coil are respectively connected to the input end of the boost module and the system common end, the third normally open contact switch is connected in series to the output path of the boost module, the first end of the second normally open contact switch is connected to the input end of the boost module, the second end of the second normally open contact switch is connected to the first end of the second coil, and the second end of the second coil is connected to the system common end. When the grid end initially supplies power to the boost module, the grid end current supplies power to the first coil through the first resistor R1, and current is limited by the first resistor R1. After the first coil is energized, the first normally open contact switch and the second normally open contact switch are controlled to be closed. After the first normally open contact switch is closed, the first resistor R1 is short-circuited, so that the grid end supplies power to the boost module normally. After the second normally open contact switch is closed, the second coil is energized. After the second coil is energized, the third normally open contact switch is controlled to be closed, so that the boost module output is normally powered, and the soft start process of the voltage module is completed.

[0067] In this embodiment, Figure 3 and Figure 4 The activated units are all boost modules, and the first electromagnetic switch and the second electromagnetic switch are preferably, but not limited to, existing AC relays or AC contactor products.

[0068] The present invention also discloses a method for increasing the capacity and stabilizing the voltage of a power grid outside a base station. In a preferred embodiment, the method comprises: obtaining the input voltage V1 of the current base station end; transforming the power grid outside the base station according to step S1, step S2 or step S3 according to the current carrying capacity of the power supply line and whether the base station needs to increase the capacity; in step S1, when the base station is an existing base station and V1≤V τ When the above structure is used to carry out voltage stabilization transformation of the external power grid, V τ Represents the first input threshold of the base station, V τ Preferably but not limited to 190V; Step S2, when the base station needs to be increased in capacity, the base station load is increased in capacity to N times the original load, and the external power grid power supply line can increase the circulating current, the above structure 1 or the above structure 2 is used to perform external power grid capacity increase and voltage stabilization transformation: When the structure 1 is used, the target input voltage V3 of the base station end after the transformation is pre-set, and the output voltage V of the boost module in the structure 1 is: V0 represents the actual output voltage value of the power grid, preferably but not limited to 220V; the current flowing through the power supply line after capacity expansion is I1 represents the current flowing in the power supply line before capacity increase; when structure 2 is adopted, the output voltage V of the boost module in structure 2 should satisfy: η represents the efficiency of the boost module and the buck module in the structure 2 at the same time, and N2 represents the multiple of the current flowing through the power supply line after the base station capacity is increased compared to that before the capacity is increased; Step S3, when the base station needs to be increased in capacity, the base station load is increased in capacity to N times the original load, and the external power grid power supply line cannot increase the current flowing through, the above structure 2 is used to increase the capacity of the external power grid and perform voltage stabilization transformation, and the output voltage V of the boost module in the structure 2 should satisfy: η represents the efficiency of the boost module in structure 2; N≥1.

[0069] In this embodiment, the current carrying capacity of the power supply line can be determined according to parameters such as line material, cross-sectional area, length, etc. when the external power supply line is initially constructed.

[0070] In this embodiment, in step S1, structure 1 is used only for base station input voltage V1≤V τ The base station is intelligently boosted. When the input voltage at the base station is V1, the line voltage drop V2 = V0-V1, and the power supply efficiency at the grid end is η 基站 =V1 / V0, assuming the energy consumption of the base station is P 负载 , then the energy consumption at the grid end P = V0P 负载 / V1. When the existing base station P load is not expanded for the time being, the base stations with too low input voltage are intelligently boosted to ensure the stability of the base station equipment and maintain the power supply line without expansion and transformation, so the line impedance Z remains basically unchanged.

[0071] In this embodiment, in step S1, the initial voltage V1 at the base station is intelligently boosted to V3. To maintain the minimum target of constant energy consumption at the grid end, at least the following conditions must be met:

[0072] ① Line impedance: Z = (V0-V1) / (P 负载 / V1)=(V0-V1)*V1 / P 负载 ;

[0073] ②Before boost: P 负载 / (V1 / V0)=P 线路 +P 负载 , that is, P 负载 *V0 / V1=Z*(P 负载 / V1) 2 +P 负载 ;

[0074] ③After boost: Z*(P 负载 / V1) 2 +P 负载 ≥[Z*(P 负载 / V3)2 +P 负载 ] / η, according to the above equations, we can get

[0075] After boosting, the overall power supply efficiency of the base station is: η 基站 =V3 2 η / (V0V1-V1 2 +V3 2 ), the output voltage of the boost end is: V=V3+(V0V1-V1 2 ) / V3, the test results of the overall power supply efficiency under different input voltage values ​​at the base station are as follows Figure 4 As shown, Figure 4 In the example, the machine room side represents the base station side. Figure 4 It can be seen that for existing base stations with input voltage below 190V, intelligent voltage boosting transformation based on 250V can not only improve the working stability of base station equipment, but also improve the overall power supply efficiency of existing base stations.

[0076] In this embodiment, preferably, in step S1, V is obtained by the following inequality group: τ : Wherein, V3 represents the target input voltage of the base station after transformation; η represents the efficiency of the boost module in structure 1; V p Indicates the withstand voltage value of the base station equipment, V p It is preferably, but not limited to, 250V or 260V.

[0077] In this embodiment, in step S2, when using structure 1, after determining the target input voltage V3 after the base station end is transformed and boosted, the voltage at the boost output end of the boost module can be obtained as: The overall power supply efficiency of the base station (i.e. the overall power supply efficiency of the power grid) is: η 基站 =V3 2 η / (V0NV1-NV1 2 +V3 2 ), the overall power supply efficiency of structure 1 was tested, and the results are as follows Figure 5 shown.

[0078] In this embodiment, in step S2, when structure 2 is adopted, the line loss increases by N2 compared with the previous one. 2 times, the following relationship holds: ①N2*I=N2*P 负载 / V1;②P 线路 Increased N2 2 times, that is, P 线路 =N2 2 *(V0 / V1-1)P 负载 ; ③V*N2P 负载 / V1=NP 负载 / η+N2 2 *(V0 / V1-1)*P 负载 . The lowest voltage boost value at the grid end is calculated At this time, the overall power supply efficiency of the base station is: η 基站 =η 2 NV1 / (NV1+N2 2 *V0η-N2 2 *ηV1). If the overall power supply efficiency of the base station remains unchanged after the base station load capacity is increased and the two-stage step-up / step-down conversion is performed, the following relationship must hold: V1 / V0≤η 2 NV1 / (NV1+N2 2 *V0η-N2 2 *ηV1), therefore: the current introduced by the external power grid increases multiples

[0079] In this embodiment, preferably, in step S2, when V1<V0η 2 When the capacity of the external power grid is increased and the voltage is stabilized, the second structure is adopted, and the current flowing through the power supply line after the capacity increase of the base station should be a multiple of N2 compared with that before the capacity increase: At this time, the power supply efficiency of the power grid remains unchanged before and after the transformation. 2 , the higher the boost output voltage value, the higher the overall power supply efficiency; at the base station end, the initial voltage V1>V0η 2 The overall power supply efficiency will decrease.

[0080] In this embodiment, in step S3, according to structure 2, the following relationship holds: V*P 负载 / V1=N*P 负载 / η+(V0 / V1-1)*P 负载 , after calculation, the lowest value of the grid voltage boost is V = V0-V1+NηV1. At this time, the overall power supply efficiency is η 基站 =η 2 NV1 / (NV1+V0η-ηV1), the overall power supply efficiency in structure 2 is tested, and the results are as follows Figure 6 When the efficiency of the two-stage boost / buck conversion is η, the higher the output voltage V at the boost end, the smaller the current on the external power grid line and the smaller the line loss. However, after the two-stage boost / buck conversion, the overall power supply efficiency of the base station is η. 基站 <η 2 .

[0081] In a preferred embodiment, after the external power grid is transformed according to structure one or structure two, it also includes a step-by-step power-on step or a direct power-on step;

[0082] The power-on steps include:

[0083] Step 1: Assume that the input voltage allowable range of the base station power supply is V A ~V AM According to the number M of boost units in the boost module, the base station power supply input voltage allowable range is divided into the following M level intervals from small to large: (V A , V A1 )、(V A1 , V A2 )、......、(V A(M-1) , V AM ), V A <V A1 <V A2 ......<V A(M-1) <V AM ; The M level intervals arranged from small to large correspond to the M boost units arranged from large to small output voltages; M is the number of boost levels, assuming the number of levels is M, such as when the input voltage at the base station is (V A , V A1 ) range, the highest-level boost unit is used for boost processing. When the input voltage at the base station is within (V A(M-1) , V AM ) range, use the lowest gear boost unit for boost processing;

[0084] Step 2: Obtain the voltage of the power supply input terminal of the base station before the modification, which is recorded as the first voltage.

[0085] Step three, switching the boost units step by step in the order of output voltage from small to large to connect to the power supply line until switching to the boost unit corresponding to the level interval to which the first voltage belongs, and connecting to the base station load, M is greater than or equal to 1.

[0086] The direct power-on steps include:

[0087] A boost unit with an input-output voltage ratio of 1:1 in the boost module is connected to the power supply line and the base station load, and a voltage at the base station power supply input terminal is obtained, which is recorded as a third voltage;

[0088] Based on the third voltage, the target output voltage of the boost module is obtained according to step S1, step S2 or step S3, and the boost unit whose output voltage is closest to the target output voltage of the boost module is connected to the power supply line.

[0089] The process of obtaining the target output voltage of the boost module by regarding the third voltage as V1 is:

[0090] When the base station is an existing base station and V1≤V τ When the target output voltage V of the boost module is obtained according to the following formula, V = V3 + (V0V1-V12 ) / V3;

[0091] When the base station needs to increase capacity and the external power grid power supply line can increase the circulating current, when structure 1 is adopted, the output voltage V of the boost module in structure 1 is:

[0092] When the base station needs to increase capacity and the external power grid power supply line can increase the circulating current, when structure 2 is adopted, the output voltage V of the boost module in structure 2 should meet the following requirements:

[0093] When the base station needs to increase capacity and the external power grid power supply line cannot increase the circulating current, when structure 2 is adopted, the output voltage V of the boost module in structure 2 should meet the following requirements:

[0094] In a preferred embodiment, after the external power grid is transformed according to structure 1 or structure 2, a voltage stabilization step is further included; the voltage stabilization step includes:

[0095] Step four, obtain the real-time voltage of the base station power supply input terminal. When the real-time voltage of the base station power supply input terminal is within the preset regulated voltage range, return to execute step four. When the real-time voltage of the base station power supply input terminal is not within the preset regulated voltage range, the voltage of the base station input terminal before modification under the current load is obtained by converting the real-time voltage of the base station power supply input terminal, which is recorded as the second voltage. The preset regulated voltage range is preferably but not limited to 190V to 260V.

[0096] Step 5, cut off the base station load, and switch the booster units step by step in the order of output voltage from small to large to connect to the power supply line until switching to the booster unit corresponding to the level interval to which the second voltage belongs, and connect to the base station load.

[0097] Or the voltage stabilization steps include:

[0098] Step 4, obtaining the real-time voltage of the power supply input terminal of the base station. When the real-time voltage of the power supply input terminal of the base station is within the preset regulated voltage range, returning to step 4, when the real-time voltage of the power supply input terminal of the base station is not within the preset regulated voltage range, obtaining the voltage of the power supply input terminal of the base station after the boost unit with an input-output voltage ratio of 1:1 in the boost module is connected to the power supply line, and recorded as the second voltage;

[0099] Step five, cut off the base station load, obtain the target output voltage of the boost module based on the third voltage according to step S1, step S2 or step S3, connect the boost unit whose output voltage is closest to the target output voltage of the boost module to the power supply line, and connect to the base station load.

[0100] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0101] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A capacity increasing and voltage stabilizing system for a power grid outside a base station, wherein a power grid end, a power supply line and a base station end are connected in sequence, characterized in that: including structure 1 or structure 2; The first structure is: a boost module is connected in series between the power grid end and the power supply line; The second structure is: a boost module is connected in series between the power grid end and the power supply line, and a buck module is connected in series between the base station end and the power supply line; The boost module includes one or more boost units that output voltages of different gears, and one or more switching switches, wherein the boost units correspond to the switching switches one by one, and the switching switches are used to control the corresponding boost units to be connected to or not connected to the power supply line; The base station external power grid capacity increasing and voltage stabilization method of the base station external power grid capacity increasing and voltage stabilization system comprises: Obtain the current input voltage V1 of the base station; according to the current carrying capacity of the power supply line and whether the base station needs to be increased in capacity, transform the power grid outside the base station according to step S1, step S2 or step S3; Step S1: When the base station is an existing base station and V1≤V τ When the structure 1 is used to carry out voltage stabilization transformation of the external power grid, V τ represents the first input threshold of the base station; Step S2: When the base station needs to be increased in capacity, the base station load is increased to N times the original load, and the external power grid power supply line can increase the circulating current, the structure 1 or structure 2 is used to perform external power grid capacity increase and voltage stabilization transformation: When structure 1 is used, the target input voltage V3 of the base station after transformation is preset, and the output voltage V of the boost module in structure 1 is: The current flowing through the power supply line after capacity expansion is I1 represents the current flowing in the power supply line before capacity expansion; V0 represents the actual output voltage value at the grid end; When structure 2 is used, the output voltage V of the boost module in structure 2 should satisfy: η represents the efficiency of the boost module and the buck module in structure 2, and N2 represents the multiple of the current flowing through the power supply line after the base station capacity is increased compared to that before the capacity increase; Step S3, when the base station needs to be increased in capacity, the base station load capacity is increased to N times of the original load, and the external power grid power supply line cannot increase the circulating current, the structure 2 is used to increase the capacity of the external power grid and stabilize the voltage. The output voltage V of the boost module in the structure 2 should meet the following requirements: Wherein, η represents the efficiency of the boost module in structure 2; N≥1.

2. The base station external power grid capacity increasing and voltage stabilizing system according to claim 1, characterized in that: The boost module includes a boost transformer, the boost transformer includes a primary winding and a secondary winding, the secondary winding is provided with a plurality of taps, and each tap is connected to a power supply line via a switching switch; Alternatively, the boost module includes a boost transformer, the boost transformer includes a winding, an input tap and a plurality of output taps are provided on the winding, and each output tap is connected to the power supply line via a switching switch.

3. The base station external power grid capacity increasing and voltage stabilizing system according to claim 1, characterized in that: It includes a load detection unit for detecting load changes at the base station end and a first monitoring unit located at the power grid end. The first monitoring unit obtains an output signal of the load detection unit and is connected to all the switching switches respectively.

4. The base station external power grid capacity increasing and voltage stabilizing system as claimed in claim 3, characterized in that: It also includes a first communication unit located at the power grid end, a second communication unit located at the base station end and a second monitoring unit; the first monitoring unit is connected to the first communication unit, the first communication unit is connected to the second communication unit, the second communication unit is connected to the second monitoring unit, and the second monitoring unit is also connected to the load detection unit.

5. The base station external power grid capacity increasing and voltage stabilizing system as claimed in claim 4, characterized in that: It also includes all or part of a first voltage detection unit, a first current detection unit, a first power unit, a first electric quantity detection unit, and a first display unit located at the grid end, wherein the first voltage detection unit, the first current detection unit, the first power unit, the first electric quantity detection unit, and the first display unit are respectively connected to the first monitoring unit; And / or also includes all or part of a second voltage detection unit, a second current detection unit, a second power unit, a second electric quantity detection unit, and a second display unit located at the base station end, wherein the second voltage detection unit, the second current detection unit, the second power unit, the second electric quantity detection unit, and the second display unit are respectively connected to the second monitoring unit; And / or also includes all or part of a third voltage detection unit, a third current detection unit, a third power unit, and a third power detection unit arranged at one end of the power supply line close to the boost module, and the third voltage detection unit, the third current detection unit, the third power unit, and the third power detection unit are respectively connected to the first monitoring unit.

6. The base station external power grid capacity increasing and voltage stabilizing system as claimed in claim 5, characterized in that: An AC input circuit breaker and an AC output circuit breaker are respectively connected in series to the power supply input port and the power supply output port at the power grid end; And / or an AC input circuit breaker and an AC output circuit breaker are respectively connected in series to the power input port and the power output port of the base station end; And / or an output control switch for controlling power on or off of the base station load is provided at the base station end, and the output control switch is connected to the second monitoring unit.

7. The base station external power grid capacity increasing and voltage stabilizing system according to claim 1, characterized in that: It also includes a soft start module, wherein the soft start module adopts structure A or structure B; The structure A is as follows: the soft start module includes a first electromagnetic switch and a first resistor, the first electromagnetic switch includes a first coil, and a first normally open contact switch and a second normally open contact switch that are linked, the first normally open contact switch is connected in series to a connection path between a power grid end and an input end of a boost module, the second normally open contact switch is connected in series to an output path of the boost module, the first resistor is connected in parallel to both ends of the first normally open contact switch, and both ends of the first coil are connected to the input end of the boost module and a system common end, respectively; The structure B is as follows: the soft start module includes a first electromagnetic switch, a second electromagnetic switch and a first resistor, the first electromagnetic switch includes a first coil, and a first normally open contact switch and a second normally open contact switch that are linked, and the second electromagnetic switch includes a second coil and a third normally open contact switch; the first normally open contact switch is connected in series to the connection path between the power grid end and the input end of the boost module, the first resistor is connected in parallel to both ends of the first normally open contact switch, the two ends of the first coil are respectively connected to the input end of the boost module and the system common end, the third normally open contact switch is connected in series to the output path of the boost module, the first end of the second normally open contact switch is connected to the input end of the boost module, the second end of the second normally open contact switch is connected to the first end of the second coil, and the second end of the second coil is connected to the system common end.

8. The base station external power grid capacity increasing and voltage stabilizing system according to claim 1, characterized in that: In step S1, V is obtained by the following inequality group: τ : Wherein, V3 represents the target input voltage of the base station after transformation; η represents the efficiency of the boost module in structure 1; V p Indicates the withstand voltage value of the base station equipment; And / or in step S2, when V1<V0η 2 When the capacity of the external power grid is increased and the voltage is stabilized, the second structure is adopted, and the current flowing through the power supply line after the capacity increase of the base station should be a multiple of N2 compared with that before the capacity increase:

9. The base station external power grid capacity increasing and voltage stabilizing system as claimed in claim 8, characterized in that: After the external power grid is transformed according to the structure 1 or the structure 2, it also includes a step-by-step power-on step or a direct power-on step, and / or a voltage stabilization step; The step of powering on step by step comprises: Step 1: Assume that the input voltage allowable range of the base station power supply is V A ~V AM ,According to the number M of boost units in the boost module, the base station power supply input voltage allowable range is divided into the following M level intervals from small to large: (V A , V A1 )、(V A1 , V A2 )、......、(V A(M-1) , V AM ), V A <V A1 <V A2 ......<V A(M-1) <V AM ; The M level intervals arranged from small to large correspond one to one with the M boost units arranged from large to small output voltages; Step 2: obtaining a voltage at a power supply input terminal of the base station before the modification, recorded as a first voltage; Step 3: Switch the booster units step by step in the order of output voltage from small to large to connect to the power supply line until the booster unit corresponding to the level interval to which the first voltage belongs is switched, and the base station load is connected, and M is greater than or equal to 1; The direct power-on step comprises: A boost unit with an input-output voltage ratio of 1:1 in the boost module is connected to the power supply line and the base station load, and a voltage at the base station power supply input terminal is obtained, which is recorded as a third voltage; Based on the third voltage, according to step S1, step S2 or step S3, a target output voltage of the boost module is obtained, and a boost unit whose output voltage is closest to the target output voltage of the boost module is connected to a power supply line; The voltage stabilization step comprises: Step 4, obtaining the real-time voltage of the base station power supply input terminal. When the real-time voltage of the base station power supply input terminal is within the preset regulated voltage range, returning to step 4, when the real-time voltage of the base station power supply input terminal is not within the preset regulated voltage range, the voltage of the base station input terminal before the transformation under the current load is obtained by converting the real-time voltage of the base station power supply input terminal, and recorded as the second voltage; Step 5: Cut off the base station load, and gradually switch the booster units to access the power supply line in the order of output voltage from small to large until switching to the booster unit corresponding to the level interval to which the second voltage belongs, and then connect the base station load; Or the voltage stabilization step includes: Step 4, obtaining the real-time voltage of the power supply input terminal of the base station. When the real-time voltage of the power supply input terminal of the base station is within the preset regulated voltage range, returning to step 4, when the real-time voltage of the power supply input terminal of the base station is not within the preset regulated voltage range, obtaining the voltage of the power supply input terminal of the base station after the boost unit with an input-output voltage ratio of 1:1 in the boost module is connected to the power supply line, and recorded as the second voltage; Step five, cut off the base station load, obtain the target output voltage of the boost module based on the third voltage according to step S1, step S2 or step S3, connect the boost unit whose output voltage is closest to the target output voltage of the boost module to the power supply line, and connect to the base station load.

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