阅读说明：本技术 井下不间断电源输入端稳压系统 (Voltage stabilizing system for input end of underground uninterrupted power supply ) 是由 刘中杰 张朝平 付志勇 邓荣刚 匡欣欣 于 2021-10-14 设计创作，主要内容包括：一种井下不间断电源输入端稳压系统,包括稳压装置、控制装置以及充电逆变装置,稳压装置包括交流输入端、多输入输出抽头变压器以及交流输出端,所述交流输入端与所述变压器的绕组输入端以及控制装置连接,且该交流输入端与所述绕组输入端的多个输入抽头之间分别设置一初级继电器,所述交流输出端与所述变压器的绕组输出端、控制装置以及充电逆变装置连接,且该交流输出端与所述绕组输出端的多个输出抽头之间分别设置一次级继电器,所述初级继电器以及次级继电器均与所述控制装置连接。本发明提高了输出稳定度,扩大了电压调节范围,同时,变压器切换档位时产生的浪涌电压不容易传入充电逆变装置而导致其工作异常,延长了充电逆变装置的使用寿命。(The utility model provides an incessant power supply input voltage stabilizing system in pit, includes voltage regulator device, controlling means and the inverter that charges, and voltage regulator device includes that AC input end, many input/output take a percentage transformer and AC output, AC input end with the winding input end and the controlling means of transformer are connected, and this AC input end with a plurality of inputs of winding input end are taken a percentage and are set up a primary relay respectively between, AC output end with the winding output end, the controlling means and the inverter that charges of transformer are connected, and this AC output end with a plurality of outputs of winding output are taken a percentage and are set up a secondary relay respectively between, primary relay and secondary relay all with controlling means connects. The invention improves the output stability, enlarges the voltage regulation range, simultaneously, the surge voltage generated when the transformer switches the gear is not easy to be transmitted into the charging inverter device to cause the abnormal work of the charging inverter device, and prolongs the service life of the charging inverter device.)

1. A voltage stabilizing system for an input end of an underground uninterrupted power supply is characterized by comprising a voltage stabilizing device, a control device and a charging inversion device, wherein the voltage stabilizing device comprises an alternating current input end, a multi-input-output tap transformer and an alternating current output end, the alternating current input end is connected with a winding input end of the transformer and the control device, primary relays are respectively arranged between the alternating current input end and a plurality of input taps of the winding input end, the alternating current output end is connected with a winding output end of the transformer, the control device and the charging inversion device, secondary relays are respectively arranged between the alternating current output end and a plurality of output taps of the winding output end, and the primary relays and the secondary relays are both connected with the control device;

the control device is configured to a voltage stabilization control function: and collecting the voltage of the alternating current output end, and controlling the primary relay and the secondary relay to switch according to the collected voltage so as to adjust the voltage of the alternating current output end within a preset standard voltage range.

2. The system according to claim 1, wherein the voltage regulation control further comprises:

s101, when an alternating current uninterruptible power supply is electrified, controlling a primary relay to switch on a middle gear of a winding input end, controlling a secondary relay to switch on a middle gear of a winding output end, and collecting voltage of the alternating current output end when a transformer is in an input middle gear and an output middle gear;

s102, adjusting the gear of the transformer: comparing the voltage of the alternating current output end with a preset standard voltage range, determining an input gear and an output gear which are to be switched by combining the input-output transformation ratio of each gear of the transformer, and switching a corresponding primary relay and a corresponding secondary relay;

s103, collecting the voltage of the alternating current output end after the gear of the transformer is adjusted, if the voltage is within the preset standard voltage range, continuously collecting the voltage of the alternating current output end, and otherwise, returning to the step S102.

3. The system according to claim 2, wherein the step S103 further comprises:

if the voltage is not within the preset standard voltage range, delaying for a preset time, and if the voltage is not within the preset standard voltage range, returning to step S102.

4. The system according to any one of claims 1 to 3, wherein the voltage stabilizer further comprises a surge absorption circuit unit connected between any output tap of the winding output ends and a common terminal.

5. The system according to claim 4, wherein the voltage regulator further comprises a filter circuit unit, and the filter circuit unit is connected to the AC output terminal.

6. The system according to claim 5, wherein the control device comprises an acquisition circuit unit, a driving circuit unit, a single chip microcomputer unit and a power supply unit for supplying power to the acquisition circuit unit, the driving circuit unit is connected with the AC output end, the driving circuit unit is connected with the primary relay and the secondary relay, the single chip microcomputer unit is connected with the acquisition circuit unit and the driving circuit unit, and the power supply unit is connected with the AC input end.

Technical Field

The invention belongs to the technical field of power grids, and particularly relates to a voltage stabilizing system for an input end of an underground uninterrupted power supply.

Background

Along with the construction and development of national intelligent mines, the requirements on the underground power supply quality of coal mines are more and more strict, and some key electric equipment requires an uninterruptible power supply (hereinafter referred to as UPS).

As shown in fig. 2, in the conventional interactive UPS, the inverter motherboard directly controls the relay on the output side of the transformer so as to select the output gear of the transformer, thereby stabilizing the output voltage, and since the relay is directly controlled by the inverter motherboard, on one hand, the surge voltage generated when the transformer switches the gear is easily transmitted to the inverter motherboard, which causes the operation of the inverter motherboard to be abnormal, on the other hand, the operating time of the inverter motherboard is increased, and the service life of the inverter motherboard is reduced.

In addition, since the fluctuation range of the downhole power load is large, the fluctuation range of the downhole power supply voltage is large, and thus, a larger voltage regulation range is also required.

Disclosure of Invention

Therefore, the voltage stabilizing system for the input end of the underground uninterrupted power supply is provided for solving the technical problems.

The technical scheme adopted by the invention is as follows:

a voltage stabilizing system for an input end of an underground uninterrupted power supply is characterized by comprising a voltage stabilizing device, a control device and a charging inversion device, wherein the voltage stabilizing device comprises an alternating current input end, a multi-input-output tap transformer and an alternating current output end, the alternating current input end is connected with a winding input end of the transformer and the control device, primary relays are respectively arranged between the alternating current input end and a plurality of input taps of the winding input end, the alternating current output end is connected with a winding output end of the transformer, the control device and the charging inversion device, secondary relays are respectively arranged between the alternating current output end and a plurality of output taps of the winding output end, and the primary relays and the secondary relays are both connected with the control device;

the control device is configured to a voltage stabilization control function: and collecting the voltage of the alternating current output end, and controlling the primary relay and the secondary relay to switch according to the collected voltage so as to adjust the voltage of the alternating current output end within a preset standard voltage range.

The input and the output of the transformer of the voltage stabilizing device are provided with the relays, so that more voltage gears can be controlled through the control device, the output stability is improved, and the voltage regulation range of the alternating current output end of the voltage stabilizing device is expanded.

Drawings

The invention is described in detail below with reference to the following figures and detailed description:

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of the voltage stabilization of the input terminal of the conventional underground uninterruptible power supply.

Detailed Description

As shown in fig. 1, an embodiment of the present disclosure provides a voltage stabilizing system for an input terminal of a downhole uninterruptible power supply, including a voltage stabilizing device 110, a control device 120, and a charging inverter device 130.

The voltage stabilizer 110 includes an ac input terminal 111, a multiple input and output tap transformer 112, an ac output terminal 113, a surge absorbing circuit unit 114, and a filter circuit unit 115.

The ac input end 111 is used for receiving an ac power supply, is connected to the winding input end a of the transformer 112, and is connected to the control device 120 for supplying power, and a primary relay 116(1 tap corresponds to 1 relay) is provided between the ac input end 111 and a plurality of input taps (tap a 1/tap a 2/tap a3) of the winding input end a, the ac output end 113 is connected to the winding output end B of the transformer 112, the control device 120, and the charging inverter device 130, and a secondary relay 117(1 tap corresponds to 1 relay) is provided between the ac output end 113 and a plurality of output taps (tap B1/tap B2/tap B3/tap B4) of the winding output end B, and control coils of the primary relay 116 and the secondary relay 117 are both connected to the control device 120.

The control device 120 controls the input gear of the transformer 112 through the primary relay 116, and the control device 120 controls the output gear of the transformer 112 through the secondary relay 117, so that more voltage gears can be controlled, the output stability is improved, and the voltage regulation range of the alternating current output end 113 of the voltage stabilizer 110 is expanded.

The surge absorption circuit unit 114 is connected between any output tap of the winding output end B and the common end G, absorbs a surge voltage generated at the moment of switching of the transformer, prevents interference with the single chip microcomputer and the post-stage charging inverter device 130, and the surge voltage is absorbed by the surge absorption circuit unit 114, so that a main factor of the underground uninterruptible alternating current power supply caused by interference work abnormality is eliminated, and of course, the surge absorption circuit unit 114 can be omitted.

Filter circuit unit 115 is connected with AC output terminal 113, because electrical equipment is of a great variety in the pit, it is serious to lead to the higher harmonic to pollute in the circuit, filter circuit unit 115 can be used for purifying AC output terminal 113's voltage, make the voltage that gets into back level charging inverter 130 be pure sine wave, charging inverter 130 is after the bypass switches, can directly output pure voltage, the harmonic has also been avoided simultaneously and has been caused charging inverter 130 to work unusually, of course, to the not serious scene of higher harmonic pollution, filter circuit unit 115 also can be left out.

The control device 120 comprises an acquisition circuit unit 121, a driving circuit unit 122, a single chip unit 123 and a power supply unit 124 for supplying power to the units, wherein the acquisition circuit unit 121 is connected with the alternating current output end 113, the driving circuit unit 122 is connected with the primary relay 116 and the secondary relay 117, the single chip unit is connected with the acquisition circuit unit and the driving circuit unit, and the power supply unit 124 is connected with the alternating current input end 111 so as to supply power to the units.

The control device 120 has a voltage stabilization control function: the single chip unit 123 collects the voltage of the ac output terminal 113 through the collection circuit unit 121, and controls the primary relay 116 and the secondary relay 117 to switch through the driving circuit unit 122 according to the collected voltage so as to adjust the voltage of the ac output terminal 113 within a preset standard voltage range.

Specifically, the voltage stabilization control further includes:

s101, when the ac ups is powered on from the ac input end 111, the mcu 123 controls the primary relay 116 to switch on the middle position of the winding input end a through the driving circuit unit 122 (to switch the tap a2 on the ac input end 111, and to switch the other taps on the winding input end a off the ac input end 111), controls the secondary relay 117 to switch on the middle position of the winding output end B (to switch the tap B2 or B3 on the ac output end 113, and to switch the other taps on the winding output end B off the ac output end 113), and collects the voltage at the ac output end 113 when the transformer 112 is in the middle position of input and output through the collecting circuit unit 121.

S102, adjusting the gear of the transformer: the single chip unit 123 compares the voltage at the ac output terminal 113 with a preset standard voltage range, determines the input and output gear to be switched in combination with the input/output transformation ratio at each gear of the transformer 112, and switches the corresponding primary relay 116 and secondary relay 117 to achieve the purpose of voltage stabilization.

If the a1 gear is 131V, the a2 gear is 127V, the b2 gear is 127V, the b3 gear is 123V, the b4 gear is 119V, the preset standard voltage range is 123-131V, the transformer is respectively in the a2 gear and the b2 gear, and when the output voltage collected by the single-chip unit 123 is 127V, the relay is not switched; when the collected voltage is higher than 131V, the secondary relay at the b2 gear is disconnected, and the secondary relay at the b3 gear is connected, so that the voltage of the output end is reduced and approaches 127V, and the voltage stabilization is realized; when the collected voltage is higher than 135V, the secondary relay at the b3 gear is disconnected, and the secondary relay at the b4 gear is connected, so that the voltage of the output end is reduced and approaches 127V, and the voltage stabilization is realized.

And when the switching secondary relay does not reach the preset standard voltage range, switching the primary relay. If the collected voltage is higher than 140V, the stage relay of the a2 gear is disconnected, the secondary relay of the a1 gear is connected, and the secondary relay of the b4 gear is connected, the voltage of the output end is reduced and approaches 127V, and voltage stabilization is realized.

And S103, the single chip microcomputer unit 123 collects the voltage of the alternating current output end 113 after the gear of the transformer 112 is adjusted through the collection circuit unit 121, if the voltage is within the preset standard voltage range, the voltage of the alternating current output end 113 continues to be collected, and otherwise, the step S102 is returned.

As a preferred embodiment, considering that the voltage fluctuation range is large but the time delay is short at the time of downhole, the step S103 further includes:

if the voltage is not within the predetermined standard voltage range, delaying for a predetermined time (generally 2-6 seconds), and if the voltage is still not within the predetermined standard voltage range, returning to step S102.

The charging inversion device 130 is used for charging, bypassing or inversion output work, when the charging inversion device is switched to the bypass, high-quality voltage is directly output, voltage stabilization control is separated from the charging inversion device 130, the charging inversion device 130 works independently, and a relay is not controlled to switch the gear of the transformer, so that surge voltage generated when the gear of the transformer is switched is not easy to transmit into the charging inversion device 130 to cause abnormal work of the charging inversion device 130, meanwhile, the working time of the charging inversion device 130 is also reduced, and the service life of the charging inversion device 130 is prolonged.

However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.