TWI795978B - Uninterruptible power device with path forced turn-off function and method of path forced turn-off the same - Google Patents

Abstract

An uninterruptible power device with a path forcible turn-off function is configured to be coupled between a power grid and a load, and the uninterruptible power device includes a bypass path, a power conversion module, a current detection unit, and a control module. The bypass path includes a switch unit, and the power conversion module connects the bypass path in parallel. The current detection unit detects a current of the bypass path and transmits a current signal to the control module. The control module provides a turn-off signal to the switch unit when a first voltage of the power grid is abnormality, and transmits a polarity of the current signal. The power conversion module generates a compensation amount according to the polarity, and generates an output voltage command according to the compensation amount and a voltage of the output terminal or the input terminal of the power conversion module.

Description

Uninterruptible power supply device with path forced shutdown function and path forced shutdown method

The invention relates to an uninterruptible power device and its control method, in particular to an uninterruptible device with path forced shutdown function and its path forced shutdown method.

Due to the increasing popularity of key electronic systems (such as servers, central control systems, etc.) in the current electronic system field, more and more attention has been paid to the continuity and stability of power supply. Most of today's solutions will add uninterruptible power supply units to meet the needs of critical electronic systems. Taking the conventional uninterruptible device 100 in FIG. 1 as an example, the uninterruptible device 100 includes a bypass path 1 and a power conversion module 22 , and the power conversion module 22 is connected to the bypass path 1 in parallel. The bypass path 1 includes a switch unit 12 , and the switch unit 12 includes a first thyristor 122 and a second thyristor 124 connected in antiparallel. The grid 200 provides a first voltage V1 to supply power to the load 300 through the grid terminal 100 - 1 , the switch unit 12 to the load terminal 100 - 2 . When the power grid 200 fails, the uninterruptible device 100 controls the switch unit 12 to turn off, and controls the power conversion module 22 to provide the second voltage V2 for backup power supply to the load 300 .

However, the characteristics of the thyristor will cause the switching unit 12 to fail to be turned off smoothly, and the grid fault is usually accompanied by a phase shift, which may cause the bypass path 1 to be turned off after several AC cycles, resulting in the entire uninterrupted power supply. The device 100 runs the risk of insufficient stability. Specifically, the characteristic of the thyristor is that when the current flows through the thyristor, the thyristor cannot be shut off quickly through the shutdown signal. Therefore, when the power grid 200 fails, the first thyristor 122 or the second thyristor 124 may still have current flowing through it, so it cannot be shut down immediately. It is necessary to wait until the thyristor has no current flowing through the thyristor before shutting down the thyristor smoothly. .

Therefore, how to design an uninterruptible power supply device with a path forced shutdown function and its path forced shutdown method to ensure that the control bypass path is successfully shut down at the moment when an abnormal cycle occurs is what the author of this case wanted to do. A major topic of research.

In order to solve the above-mentioned problems, the present invention provides an uninterruptible power supply device with a forced shutdown function to overcome the problems of the prior art. Therefore, the uninterruptible device of the present invention is configured to be coupled between the grid and the load, and the uninterruptible device includes a bypass path, at least one power conversion module, a current detection unit and a control module. The bypass path is coupled to the grid through the grid end and coupled to the load through the load end. The bypass path includes at least one switch unit, and the at least one switch unit includes a first thyristor body and a second thyristor body, and the first thyristor body and the second thyristor body are connected in antiparallel; the bypass path is used to receive the first voltage through the grid terminal , and transmit the first voltage to the load terminal. At least one power conversion module includes an input terminal and an output terminal; the input terminal is coupled to the grid terminal, and the output terminal is coupled to the load terminal. The current detection unit is coupled to the bypass path, and is used for detecting the current of the bypass path and correspondingly transmitting a current signal. The control module is coupled to the current detection unit and at least one power conversion module. When the first voltage is abnormal, the control module provides a shutdown signal to the first thyristor and the second thyristor, and transmits the power The polarity of the current signal is sent to at least one power conversion module. The power conversion module generates a compensation amount according to the polarity of the current signal, and generates an output voltage command according to the compensation amount and the voltage at the output terminal or the input terminal.

In order to solve the above-mentioned problems, the present invention provides a method for forcibly shutting down the path of an uninterruptible device to overcome the problems of the prior art. The uninterruptible power supply includes a bypass path and at least one power conversion module, and the bypass path is coupled to the grid and the load; the bypass path includes at least one switch unit, and at least the switch unit includes a first thyristor and a second thyristor connected in antiparallel Two thyristors. The bypass path receives the first voltage through the grid end, and transmits the first voltage to the load end. Therefore, the path forced shutdown method of the present invention includes the following steps: (a) Knowing that the first voltage is abnormal. (b) providing a shutdown signal to the first thyristor and the second thyristor according to the abnormality of the first voltage, and transmitting the polarity of the current in the bypass path to at least one power conversion module. (c) controlling at least one power conversion module to provide a second voltage to the load terminal, and the second voltage is the sum of the voltage of the input terminal or the output terminal of the at least one power conversion module and the additionally injected compensation voltage. And, (d) controlling at least one power conversion module to provide a second voltage to the load terminal, and the second voltage is corresponding to the first voltage in normal state.

The main purpose and effect of the present invention is that when the power grid voltage provided by the power grid is abnormal, the uninterruptible power supply device of the present invention can use the control module to control the power conversion module to provide a reverse bias The reverse bias cuts off the thyristor that is not turned off, so as to ensure the success of turning off the bypass path in the abnormal cycle.

In order to further understand the technology, means and effects that the present invention adopts to achieve the predetermined purpose, please refer to the following detailed description and accompanying drawings of the present invention. It is believed that the purpose, characteristics and characteristics of the present invention can be obtained from this in depth and For specific understanding, however, the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present invention.

100, 100': UPS

100-1: grid end

100-2: load end

1, 1': bypass path

12: switch unit

122: The first thyramid

124: The second thyramid

22. 22-1~22-n: power conversion module

22A: input terminal

22B: output terminal

222: AC-DC conversion unit

224: DC AC conversion unit

226: Energy storage unit

228: DC-DC conversion unit

230: control unit

3: Current detection unit

4: Control module

422: judgment unit

442: voltage compensation unit

444: Adder

446:Pulse Width Modulation Unit

200: grid

300: load

V1: first voltage

V2: second voltage

Vdc: DC voltage

Vc: compensation amount

I: current

Son: conduction signal

Soff: shutdown signal

Si: current signal

Sp: Polarity

Sv: voltage signal

Voc: output voltage command

PWM: pulse width modulation signal

(S100)~(S180): Steps

Fig. 1 is a circuit block diagram of a known uninterruptible power device; Fig. 2 is a circuit block diagram of an uninterruptible power device with path forced shutdown function of the present invention; Fig. 3A is a single-phase circuit with path forced shutdown function of the present invention The circuit block diagram of the uninterruptible power supply device; Fig. 3B is the circuit block diagram of the three-phase uninterruptible power supply device with the path forced shutdown function of the present invention; Fig. 4 is the circuit block diagram of the control module with the path forced shutdown function of the present invention ; and FIG. 5 is a flowchart of the forced shutdown method of the uninterruptible device of the present invention.

Hereby, the technical content and detailed description of the present invention are explained as follows in conjunction with the drawings: please refer to FIG. 2 which is a circuit block diagram of the uninterruptible power supply device with the path forced shutdown function of the present invention, and refer to FIG. 1 for complex cooperation. The UPS 100 is configured to be coupled between the grid 200 and the load 300, and includes a grid terminal 100-1 and a load terminal 100-2. The grid terminal 100 - 1 is coupled to the grid 200 and receives a first voltage V1 provided by the grid 200 . The load terminal 100 - 2 is coupled to the load 300 and provides power to the load 300 to maintain a stable and normal operation of the load 300 . The uninterruptible power supply device 100 also includes a bypass path 1, at least one power conversion module 22, a current detection unit 3 and a control module 4, and one end of the bypass path 1 is coupled to the grid 200 through the grid terminal 100-1, and the other One end is coupled to the load 300 through the load end 100-2. The bypass path 1 includes at least one switch unit 12 , and the switch unit 12 is serially connected to the bypass path 1 . The switch unit 12 includes a first thyristor 122 and a second thyristor 124, and the first thyristor 122 and the second thyristor The bodies 124 are connected in antiparallel. The bypass path 1 is used to receive the first voltage V1 through the grid terminal 100-1, and transmit the first voltage V1 to the load terminal 100-2 through the switch unit 12, so as to supply power to the load terminal 100-2.

This embodiment is illustrated by a power conversion module 22 , and the power conversion module 22 includes an input terminal 22A and an output terminal 22B. The input terminal 22A is coupled to the grid terminal 100-1 to receive the first voltage V1, and the output terminal 22B is coupled to the load terminal 100-2. The power conversion module 22 is used for converting the first voltage V1 into a second voltage V2 to provide the second voltage V2 to supply power to the load 300 . Among them, the power conversion module 22 can detect the input terminal 22A and the output terminal 22B through several detection units (not shown), so as to know the input and output voltage and current, and perform corresponding feedback control. The current detection unit 3 is coupled between the load terminal 100-2 and the switch unit 12, and is used for detecting the current I flowing through the bypass path 1 to provide a current signal Si. The control module 4 is coupled to the current detection unit 3 and the power conversion module 22, and obtains the magnitude and direction of the current I by receiving the current signal Si. Specifically, the control module 4 can determine whether the first voltage V1 is abnormal by detecting the grid terminal 100-1, or by receiving the detection provided by an external device such as but not limited to a system controller (not shown in the figure). signal to judge or know whether the first voltage V1 is abnormal.

When the first voltage V1 is normal, the uninterruptible power supply 100 can operate in a high-efficiency mode, and the control module 4 provides a conduction signal Son to control the switch unit 12 to conduct (that is, to control the conduction between the first thyristor 122 and the second thyristor 124 ). , so that the first voltage V1 is provided to the load 300 through the bypass path 1 . At this time, the power conversion module 22 can stand by and not operate, or the power conversion module 22 can also perform harmonic compensation for the load 300 .

When the first voltage V1 is abnormal, the control module 4 performs the operation of forcibly shutting down the path of the uninterruptible device 100 , and then supplies power to the load 300 after the path is forcibly turned off. Furthermore, due to the characteristics of the thyristor, when the thyristor still has a current flowing through it, the thyristor cannot be shut off quickly. Therefore, when the first voltage V1 is abnormal, even if the control module 4 controls the first thyristor 122 and the second thyristor 122 by providing an off signal Soff The two thyristors 124 are turned off, but usually one of the thyristors still has current flowing and cannot be turned off quickly, resulting in the shortcoming that the bypass path 1 is turned off too slowly. For this reason, it is necessary to provide a reverse bias voltage to the thyristor that has not been turned off, so that the thyristor can be quickly turned off. Therefore, the main purpose and function of the present invention is to use the control module 4 to control the power conversion module 22 to provide a reverse bias voltage to the unturned thyristor when the first voltage V1 is abnormal, so as to quickly turn off the thyristor.

Specifically, when the first voltage V1 is abnormal, the control module 4 provides an off signal Soff to the first thyristor 122 and the second thyristor 124 to ensure that the thyristors will not be triggered to turn on again. Then, the control module 4 transmits the polarity Sp of the current signal Si to the power conversion module 22 . After the power conversion module 22 receives the polarity Sp of the current signal Si, the power conversion module 22 generates a compensation amount according to the polarity Sp, and according to the compensation amount and the voltage of the input terminal 22A or the output terminal 22B (that is, the power conversion module 22 detects The input terminal 22A or the current voltage of the output terminal 22B) to generate the output voltage command. In this way, the second voltage V2 generated by the corresponding output voltage command can be used to cut off the reverse bias of the thyristor that is not turned off, so as to ensure that at the moment when the abnormality occurs (that is, the AC voltage cycle that can occur when the abnormality occurs), the control The effect of successfully shutting down the bypass path. In addition, since the whole uninterruptible power supply 100 does not have additional circuit elements or control circuits for quickly turning off the switch unit 12, only the detection and control of the control module 4 and the power conversion module 22 are required, so it can It achieves the effect of saving the circuit volume without additionally increasing the circuit cost. It is worth mentioning that the present invention combines the advantages of closed-loop control and open-loop control. The following further explains that if the closed-loop method is used to detect and control the current of the thyristor to drop to zero, a high-bandwidth current sensor will be required, and the cost High and usually dynamic slowly or risk of instability; on the other hand, if the voltage is generated according to the polarity of the current flowing through the thyristor and the reference sine wave, sometimes the thyristor current cannot be turned off, mainly because when the power grid When the voltage is abnormal, it is usually accompanied by phase deviation or harmonics, especially when the grid voltage is accompanied by harmonics, it will cause shutdown failure. According to the present invention, the polarity of the current flowing through the thyristor corresponds to the input or output of the power conversion module. Because only the current directionality needs to be obtained, a high-bandwidth current sensor is not required, and because the information of the actual voltage is used, when the grid voltage has harmonics, it can still ensure that the thyristor is turned off.

After the aforementioned forced shutdown stage, after both the first thyristor 122 and the second thyristor 124 are turned off, the power conversion module 22 operates in the uninterruptible power supply mode, that is, the second voltage provided by the power conversion module 22 V2 is corresponding to the first voltage V1 in normal state, so as to supply backup power to the load 300 . It is worth mentioning that in one embodiment of the present invention, the normality of the first voltage V1 means that the voltage amplitude, phase, and frequency of the AC voltage are within the predetermined range that meets the specifications, and it may be able to tolerate some harmonic distortion or unstable amplitude. phenomenon, but still meet the standards required for load 300 operation. On the other hand, if the first voltage V1 is abnormal, it may mean that the voltage amplitude, phase and frequency of the AC voltage do not meet the specifications. The possible causes are that the power grid 200 is not stable enough, the components are in poor contact, the harmonic distortion is too large, or the power grid 200 is disconnected. caused by electricity.

Please refer to FIG. 3A, which is a circuit block diagram of a single-phase uninterruptible power supply device with path forced shutdown function according to the present invention, and refer to FIG. 2 for the combination. Since the UPS 100 is used in a single-phase power system, the bypass path 1 is a single-phase circuit path. The number of switch units 12 corresponds to the number of phases of the power system and forms a group, and is connected in series on the single-phase circuit path. Taking one power conversion module 22 as an example, the power conversion module 22 includes an AC-DC conversion unit 222 , a DC-AC conversion unit 224 , an energy storage unit 226 and a control unit 230 . The AC-DC conversion unit 222 is coupled to the grid terminal 100-1 and used for converting the first voltage V1 into a DC voltage Vdc. The DC-AC conversion unit 224 is coupled to the AC-DC conversion unit 222 and the load terminal 100-2, and is used for converting the DC voltage Vdc into a second voltage V2. The energy storage unit 226 (for example, but not limited to, a battery) is coupled between the AC-DC conversion unit 222 and the DC-AC conversion unit 224 and used for storing the DC voltage Vdc. Wherein, the power conversion module 22 may further include a DC-DC conversion unit 228, and the DC-DC conversion unit 228 is coupled to the AC-DC conversion unit 222, the DC-AC conversion unit 224 and Between the energy storage unit 226 . The DC-DC converting unit 228 is used for converting the DC voltage Vdc stored in the energy storage unit 226 between DCs, so that the converted DC voltage Vdc is suitable for the DC-AC converting unit 224 to convert the second voltage V2.

The control unit 230 is coupled to the control module 4 and the DC/AC conversion unit 224, and in addition to receiving the polarity Sp of the current signal Si, it also receives the detection signal corresponding to the voltage and current of the input terminal 22A or the output terminal 22B, and uses the corresponding Control the DC-AC converting unit 224 . Specifically, the control unit 230 receives the voltage signal Sv corresponding to the input terminal 22A or the output terminal 22B, and generates a compensation value according to the polarity Sp, so as to generate an output voltage command according to the compensation value and the voltage signal Sv, and provides The pulse width modulation signal PWM controls the DC to AC conversion unit 224 . Because one of the first thyristor 122 and the second thyristor 124 may be in the conduction state, the actual voltage on the bypass path 1 can be obtained by detecting the voltage signal Sv of the input terminal 22A or the output terminal 22B, thereby The output voltage of the DC-AC converting unit 224 is controlled to turn off the first thyristor 122 or the second thyristor 124 . Wherein, the control unit 230 can be a controller that controls the DC-AC conversion unit 224 alone, or can additionally include a controller that controls the AC-DC conversion unit 222 and the DC-DC conversion unit 228, but in order to focus on describing the main features of this case, so in The figure only shows that the control unit 230 provides the pulse width modulation signal PWM to control the DC-AC conversion unit 224. In addition, all units of the power conversion module 22 are not limited to be integrated in the same accommodation space.

When the first voltage V1 is normal, the control module 4 provides the conduction signal Son to control the switch unit 12 to conduct, and the first voltage V1 is provided to the load 300 through the switch unit 12 . The control unit 230 can control the AC-DC conversion unit 222 and the DC-DC conversion unit 228 to convert the first voltage V1 into a DC voltage Vdc to charge the energy storage unit 226 . When the electrical first voltage V1 is normal, the control unit 230 can The DC/AC conversion unit 224 is controlled to stand by, so as to save power consumption of the power conversion module 22 . Alternatively, the control unit 230 can control the DC-AC conversion unit 224 to perform harmonic compensation for the load 300 .

When the first voltage V1 is abnormal, it starts to enter the thyristor forced shutdown stage, and the control module 4 provides the shutdown signal Soff to the first thyristor 122 and the second thyristor 124 to ensure that the thyristor will not be triggered again, and according to the current The current signal Si provided by the detection unit 3 transmits the polarity Sp to the control unit 230 accordingly. The control unit 230 generates a compensation amount according to the polarity Sp, and generates an output voltage command according to the compensation amount and the voltage signal Sv, so as to provide a pulse width modulation signal PWM through the output voltage command to control the DC-AC conversion unit 224, and the DC-AC conversion unit 224 according to the pulse width The modulation signal PWM converts the DC voltage Vdc into a second voltage V2 (the second voltage V2 is the voltage in response to the output voltage command at this stage), so as to provide a reverse bias voltage to the thyristor that has not been turned off and quickly turn off the thyristor . During the forced-off stage of the thyristor, the output voltage of the DC-AC converting unit 224 (ie, the second voltage V2 ) basically responds to the output voltage command, unless a little difference occurs when the voltage command exceeds the upper limit of the pulse width modulation. Finally, when both the first thyristor 122 and the second thyristor 124 are turned off, the control unit 230 operates in the uninterruptible power supply mode to control the output voltage of the DC-to-AC conversion unit 224 (that is, the second voltage V2 ) to be an AC string. Wave to provide a stable power supply to the load 300.

Please refer to FIG. 3B , which is a circuit block diagram of the three-phase uninterruptible power supply device with path forced shutdown function of the present invention, and refer to FIGS. 2-3A for the combination. Since the UPS 100' is used in a three-phase power system, the bypass path 1' is a three-phase circuit path. The number of switch units 12 is three groups corresponding to the number of phases of the power system, and each is connected in series with one phase of the three-phase circuit path. Since the power of the three-phase uninterruptible power supply is usually relatively large, multiple power conversion modules 22 - 1 - 22 -n can be connected in parallel, but not limited thereto. The difference between each power conversion module 22-1~22-n and the power conversion module 22 in FIG. Each power conversion module 22-1~22- n may respectively include circuits as shown in FIG. 3A (ie, an AC-DC conversion unit 222 , a DC-AC conversion unit 224 , an energy storage unit 226 , and a control unit 230 , etc.). Wherein, in order to describe the main points shown in this figure in detail, the power conversion modules 22 - 1 - 22 - n are represented by a single box.

The difference between the single-phase system in FIG. 3A and the three-phase system in FIG. 3B is that the voltage (first voltage V1) of the grid 200 is a three-phase AC voltage, so the voltage, phase and current direction of each phase at the same time will be different. same. When the first voltage V1 is abnormal and the control module 4 provides the shutdown signal Soff to turn off the first thyristor 122 and the second thyristor 124, since the current direction of each phase is different, the control module 4 is based on The current direction of each phase sends the polarity Sp to the control unit 230 of each power conversion module 22-1~22-n, so the output voltage command can be generated correspondingly according to the individual conditions of each phase, and the remaining power can be turned off. The second voltage V2 of the thyristor ensures that the path is successfully turned off at the moment when the first voltage V1 is abnormal.

Please refer to FIG. 4 which is a circuit block diagram of the control module with path forced shutdown function according to the present invention, and refer to FIGS. 2-3B for complex coordination. The control module 4 includes a judging unit 422 , and the judging unit 422 is coupled to the current detecting unit 3 . The judging unit 422 is used for judging the direction of the current I of the bypass path 1 according to the current signal Si provided by the current detecting unit 3 , so as to provide the polarity Sp of the current signal Si accordingly. The control unit 230 includes a voltage compensation unit 442 , an adder 444 and a pulse width modulation unit 446 , and the voltage compensation unit 442 is coupled to the determination unit 422 . When the first voltage V1 is abnormal, the compensation unit 442 is configured to provide a compensation value Vc according to the polarity Sp. The control unit 230 can be implemented using an analog circuit, or can be implemented using a microcontroller (MCU) or a digital signal processor (DSP).

Specifically, when the judging unit 422 judges that the current direction is from the grid end 100-1 to the load end 100-2 according to the current signal Si, the judging unit 422 transmits a positive value (for example, but not limited to, transmitting "1" means a positive value ) polarity Sp to the voltage compensation unit 442 . The voltage compensation unit 442 according to the polarity of the positive Sp produces a positive compensation amount Vc. Otherwise, the judging unit 422 transmits the polarity Sp of a negative value (for example, but not limited to, transmitting “-1” to represent a negative value) to the voltage compensation unit 442 . The voltage compensation unit 442 generates a negative compensation value Vc according to the negative polarity Sp. The adder 444 is coupled to the voltage compensation unit 442, and is used to provide the output voltage command Voc to the pulse width modulation according to the compensation amount Vc and the voltage signal Sv (the signal obtained by detecting the input terminal 22A or the output terminal 22B of the power conversion module 22). Variable unit 446. The pulse width modulation unit 446 is coupled to the adder 444 and modulates the pulse width modulation signal PWM according to the output voltage command Voc to control the second voltage V2 output by the DC to AC conversion unit 224 . Wherein, the second voltage V2 is a value obtained by summing the compensation voltage corresponding to the compensation amount Vc and the voltage corresponding to the voltage signal Sv (ie, the current voltage of the input terminal 22A or the output terminal 22B of the power conversion module 22 ). In this way, the second voltage V2 must reverse-bias the thyristors that are not turned off, so as to forcibly turn off the switching unit 12 by providing a reverse bias voltage (ie, the second voltage V2 ). Further explanation, the circuit block diagram in Figure 4 represents the control block diagram of each phase, taking the single-phase system in Figure 3A as an example, the voltage corresponding to the voltage signal Sv can be the voltage of the L phase, and the polarity Sp is the polarity of the L phase current ; If the three-phase system in Figure 3B is taken as an example, the voltage signal Sv is the voltage of each phase (such as U, V, W phase or R, S, T phase), and the polarity Sp is the current polarity of each phase, thereby The output voltage commands of each phase can be generated separately, so as to control the second voltage V2 output by the DC-AC conversion unit 224 to turn off the switch unit 12 of each phase.

Please refer to FIG. 5 , which is a flow chart of the path forced shutdown method of the uninterruptible device of the present invention, and refer to FIGS. 2-4 for complex cooperation. The method for forcibly turning off the path includes learning that the first voltage is abnormal (S100). A preferred embodiment is to use the control module 4 to determine whether the first voltage V1 is abnormal by detecting the grid terminal 100 - 1 . Alternatively, the control module 4 is used to determine or know whether the first voltage V1 is abnormal by receiving a detection signal provided by an external device (not shown) such as but not limited to a system controller. Then, according to the abnormality of the first voltage, a shutdown signal is provided to the first thyristor and the second thyristor, and the polarity of the current of the bypass path is transmitted to at least one power conversion module (S120). A preferred embodiment is that after the shutdown signal Soff is provided, the current detection unit 3 is used to detect the current I of the bypass path 1 to provide a current signal Si, and the control module 4 is used to judge the current I according to the current signal Si. The current direction is used to transmit the polarity Sp to the power conversion module 22 according to the current direction.

Then, the power conversion module is controlled to provide a second voltage to the load terminal, and the second voltage is the sum of the voltage at the input terminal or the output terminal of the power conversion module and the additionally injected compensation voltage ( S140 ). The power conversion module 22 includes an AC-DC conversion unit 222, a DC-AC conversion unit 224, an energy storage unit 226 and a control unit 230, and when the first voltage V1 is normal, the AC-DC conversion unit 222 is controlled to convert the first voltage V1 into DC Voltage Vdc. The DC voltage Vdc can be directly stored in the battery, or converted into a voltage suitable for storage by the DC-to-DC conversion unit 228 and stored in the battery.

A preferred implementation manner of the step ( S140 ) is that the control unit 230 receives the polarity Sp, and generates the compensation Vc according to the polarity Sp. The control unit 230 also receives the voltage signal Sv, which is obtained by detecting the voltage of the input terminal 22A or the output terminal 22B of the power conversion module 22 through an additional detection unit. The control unit 230 generates the output voltage command Voc according to the compensation amount Vc and the voltage signal Sv, and modulates the pulse width modulation signal PWM according to the output voltage command Voc. The pulse width modulation signal PWM is provided to the DC-AC converting unit 224 to control the DC-AC converting unit 224 to convert the DC voltage Vdc into the second voltage V2. Wherein, the compensation amount Vc corresponds to the additionally injected compensation voltage. In this way, the unturned thyristor can be reverse-biased off by using the total voltage, so as to realize the rapid (that is, the AC voltage cycle under abnormal occurrence) turn off switch unit 12, so as to ensure that at the moment of the abnormal cycle, the path Turn off the effect of success.

Finally, the control power conversion module provides a second voltage to the load terminal, and the second voltage is corresponding to the first voltage in normal state ( S160 ). A preferred embodiment is to use the control module 4 to detect and judge After both the first thyristor 122 and the second thyristor 124 are turned off, the control module 4 can provide a signal to inform the control unit 230 of the power conversion module 22 . The control unit 230 operates in the uninterruptible power supply mode, that is, the control unit 230 controls the second voltage V2 provided by the DC-AC conversion unit 224 to be corresponding to the first voltage V1 (that is, an AC voltage) in normal conditions, so as to control the load 300 Backup power supply. . It is worth mentioning that, in one embodiment of the present invention, the detailed implementation of the above steps (S100)-(S160) can refer to the detailed descriptions in FIGS. In addition, in one embodiment of the present invention, the steps described in FIG. 5 are limited to be implemented using only the components shown in FIGS. Included in the category of this embodiment.

However, the above description is only a detailed description and drawings of preferred embodiments of the present invention, but the features of the present invention are not limited thereto, and are not intended to limit the present invention. The entire scope of the present invention should be applied for as follows The scope of the patent shall prevail, and all embodiments that conform to the spirit of the patent scope of the present invention and its similar changes shall be included in the scope of the present invention, and any person familiar with the art can easily think of it in the field of the present invention Changes or modifications can be covered by the scope of the following patents in this case.

100: UPS

100-1: grid end

100-2: load end

1: Bypass path

12: switch unit

122: The first thyramid

124: The second thyramid

22: Power conversion module

22A: input terminal

22B: output terminal

3: Current detection unit

4: Control module

200: grid

300: load

V1: first voltage

V2: second voltage

I: Current

Si: current signal

Son: conduction signal

Soff: shutdown signal

Sp: Polarity

Claims (15)

An uninterruptible device with path forced shutdown function, configured to be coupled between a grid and a load, the uninterruptible device includes: a bypass path, coupled to the grid through a grid end, and through a load end The load is coupled; the bypass path includes at least one switch unit, and the at least one switch unit includes a first thyristor and a second thyristor, and the first thyristor and the second thyristor are connected in antiparallel; the The bypass path is used to receive a first voltage through the grid terminal and transmit the first voltage to the load terminal; at least one power conversion module, the at least one power conversion module includes an input terminal and an output terminal; the The input end is coupled to the grid end, and the output end is coupled to the load end; a current detection unit is coupled to the bypass path, and is used to detect a current of the bypass path and transmit a current signal correspondingly ; and a control module, coupled to the current detection unit and the at least one power conversion module; wherein, the control module provides a shutdown signal to the first thyristor and the first thyristor when the first voltage is abnormal a second thyristor, and transmit a polarity of the current signal to the at least one power conversion module; the at least one power conversion module generates a compensation amount according to the polarity, and according to the compensation amount and the input end or the output end A voltage is used to generate an output voltage command; the output voltage command controls a second voltage provided by the at least one power conversion module to be the voltage and additional injection of the input terminal or the output terminal of the at least one power conversion module The sum of a compensation voltage. The uninterruptible power supply device as described in claim 1, wherein the at least one power conversion module includes: an AC-DC conversion unit coupled to the grid end and used for converting the first voltage into a DC voltage; a DC-AC conversion unit, coupled to the AC-DC conversion unit and the load terminal, and used to convert the DC voltage into the second voltage; and a control unit, coupled to the DC-AC conversion unit, and used to convert the DC voltage to the second voltage according to the A voltage signal with a polarity corresponding to the voltage generates the output voltage command, so as to provide a pulse width modulation signal to control the DC-AC conversion unit according to the output voltage command. The uninterruptible power supply device as described in claim 2, wherein the control unit controls the second voltage converted by the DC-AC conversion unit to be the compensation voltage corresponding to the compensation amount and the voltage through the pulse width modulation signal Sum. The uninterruptible power supply device as described in claim 2, wherein the control unit includes: a voltage compensation unit, coupled to the control module, and used to provide the compensation amount according to the polarity; an adder, coupled to the voltage compensation a unit for providing the output voltage command according to the compensation amount and the voltage signal; and a pulse width modulation unit coupled to the adder and used for providing the pulse width modulation signal according to the output voltage command. The uninterruptible power supply device as described in claim 1, wherein the control module includes: a judging unit, coupled to the current detecting unit, and judging a current direction of the current according to the current signal, and according to the current direction The polarity is transmitted to the at least one power conversion module. The uninterruptible power supply device as described in claim 5, wherein the judging unit judges according to the current signal that the current direction is from the grid end to the load end, and transmits the polarity of a positive value; the judging unit judges according to the current signal The direction of the current is the polarity that transmits a negative value from the load terminal to the grid terminal. The uninterruptible power supply device as described in claim 1, wherein the bypass path is a three-phase circuit path, the number of the at least one switch unit is three groups, and each is connected in series to one phase of the three-phase circuit path . The uninterruptible power supply device according to claim 1, wherein the bypass path is a single-phase circuit path, and the at least one switch unit is in one group and connected in series on the single-phase circuit path. As for the uninterruptible power supply device described in claim 1, the control module judges whether the first voltage is abnormal by detecting the grid terminal, or judges or knows the first voltage by receiving a detection signal provided by an external device 1. Whether the voltage is abnormal. The uninterruptible power supply device according to claim 7, wherein the input end and the output end of the at least one power conversion module are a three-phase AC power end. A path forced shutdown method of an uninterruptible device, the uninterruptible device includes a bypass path and at least one power conversion module, and the bypass path is coupled to a grid and a load; the bypass path includes at least one switch unit, and the at least one switch unit includes a first thyristor and a second thyristor connected in antiparallel; the bypass path receives a first voltage through the grid end, and transmits the first voltage to the load end; The path forced shutdown method includes the following steps: (a) knowing that the first voltage is abnormal; (b) providing a shutdown signal to the first thyristor and the second thyristor according to the first voltage abnormality, and transmitting a polarity of a current of the bypass path to the at least one power conversion module; (c) controlling the at least one power conversion module to provide a second voltage to the load terminal, and the second voltage is the at least one the sum of a voltage at an input terminal or an output terminal of the power conversion module and an additionally injected compensation voltage; and (d) controlling the at least one power conversion module to provide the second voltage to the load terminal, and the second voltage is corresponding to the first voltage in normal state. The path forced shutdown method as described in claim item 11, wherein step (b) further includes the following steps: (b1) receiving a current signal correspondingly provided by a current detection unit to detect the current of the bypass path; and (b2) providing the polarity of the current signal to the at least one power conversion module. The path forced shutdown method according to claim 11, wherein the at least one power conversion module includes an AC-DC conversion unit and a DC-AC conversion unit, and the AC-DC conversion unit switches the first voltage to normal A voltage is converted into a DC voltage; step (c) further includes the following steps: (c1) the at least one power conversion module receives the polarity; and (c2) generates a compensation amount according to the polarity, and according to the compensation amount and the A voltage signal corresponding to the voltage to generate an output voltage command; and (c3) controlling the DC-AC conversion unit to convert the DC voltage into the second voltage according to the output voltage command; wherein, the compensation amount corresponds to the additionally injected the compensation voltage. The path forced shutdown method as described in claim item 13, wherein step (d) further includes the following steps: (d1) detecting and judging that the first thyristor and the second thyristor are shut off; and (d2) controlling The DC-AC conversion unit converts the DC voltage into the second voltage. The path forced shutdown method as described in claim item 11, wherein step (a) further includes the following steps: (a1) judging whether the first voltage is abnormal by detecting the grid terminal, or by receiving an external device provided The detection signal is used to determine whether the first voltage is abnormal.

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