JP5188536B2 - Power supply inspection device, power supply inspection method, power supply device - Google Patents

Description

  The present invention relates to a power supply inspection device, a power supply inspection method, and a power supply device.

  Some DC power supply devices that generate DC voltage by rectifying and smoothing input AC voltage include a storage battery. Such a DC power supply device is generally called an uninterruptible power supply device, and generates a DC voltage using a storage battery as a power source when no AC voltage is input (see, for example, Patent Document 1).

JP 2002-101571 A

  In the above-described DC power supply device, if a storage battery, a rectifier circuit that rectifies an AC voltage, or the like is deteriorated, a desired DC voltage may not be generated. For this reason, the storage battery is diagnosed by a technique disclosed in Patent Document 1, for example, while the DC power supply device is operating. On the other hand, the inspection of whether or not there is an abnormality in the rectifier circuit or the like is generally performed while the operation of the DC power supply device is stopped. As a result, when the rectifier circuit or the like is inspected, it is necessary to stop not only the DC power supply device but also the equipment to which the power of the DC power supply device is supplied.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a power supply inspection apparatus capable of inspecting a power supply apparatus without stopping the power supply apparatus.

To achieve the above object, a rectifier circuit device according to one aspect of the present invention includes bridge-connected first to sixth rectifier elements, and the first rectifier element of the rectifier circuit that rectifies a three-phase AC voltage. A first measurement unit that measures a first current that flows through a first wiring that is connected to a connection point between the anode and the cathode of the second rectifying element and to which one of the three-phase AC voltages is applied. And a second phase different from the first voltage, which is a one-phase voltage of the three-phase AC voltage and is connected to a connection point between the anode of the third rectifier element and the cathode of the fourth rectifier element of the rectifier circuit. A second measuring unit for measuring a second current flowing in the second wiring to which a voltage is applied, and a connection point between an anode of the fifth rectifying element and a cathode of a sixth rectifying element of the rectifier circuit; The AC voltage is a one-phase voltage, and A third measuring unit for measuring a third current flowing in a third wiring to which a third voltage different from the second voltage is applied; and a magnitude of a direct current component of the first current is equal to a direct current component of the second current A determination unit that determines that the first or second rectifying element is not operating at a predetermined timing according to a level of the three-phase AC voltage when the magnitude and the magnitude of the DC component of the third current are larger ; Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the power supply inspection apparatus which can test | inspect a power supply device, without stopping a power supply device can be provided.

It is a figure which shows the structure of the DC power supply device 10 which is one Embodiment of this invention. It is a figure which shows the main waveforms of the power supply device 20 in case the firing angle of the thyristors 50-52 is 180 degree | times. It is a figure which shows the main waveforms of the power supply device 20 when an ignition angle is 180 degree | times and the thyristor 51 has an open failure. It is a figure which shows the main waveforms of the power supply device 20 in case the firing angle of the thyristors 50-52 is 90 degree | times. It is a figure which shows the main waveforms of the power supply device 20 when an ignition angle is 90 degree | times and the thyristor 51 has an open failure. It is a figure which shows the waveform of the output current Iout when the capacitance value of the capacitor | condenser 31 falls. It is a figure which shows the characteristic of the output electric current Iout. It is a figure which shows the functional block which the microcomputer 82 implement | achieves. 4 is a flowchart illustrating an example of processing in which the inspection device 22 inspects whether or not there is an abnormality in the DC power supply device 10. It is a flowchart which shows an example of determination process S107.

At least the following matters will become apparent from the description of this specification and the accompanying drawings.
FIG. 1 is a diagram illustrating a configuration example of a DC power supply device 10 according to an embodiment of the present invention. The DC power supply device 10 is a device that is provided in, for example, an electric station (not shown), and generates a power source for operating a relay or the like (not shown) from an input three-phase AC voltage. A current transformer 21 and an inspection device 22 are included.

  The power supply device 20 is a device that generates a desired output voltage Vout from the three-phase AC voltages Vr, Vs, and Vt, and includes a rectifier circuit 30, a capacitor 31, a storage battery 32, a control device 33, power supply lines 35 and 36, and power distribution. It is comprised including the circuit breakers 40-45.

  The current transformer 21 (measurement unit) measures the current Iout output from the rectifier circuit 30 and the capacitor 31. The current transformer 21 is a so-called DC current transformer, and measures the DC component and the AC component of the output current Iout.

  The inspection device 22 inspects whether or not the rectifier circuit 30, the capacitor 31, and the control device 33 in the power supply device 20 are abnormal based on the measurement result of the current transformer 21. Although details will be described later, for example, when the rectifier circuit 30 or the capacitor 31 fails, a ripple current that is an AC component of the output current Iout increases. Based on such a phenomenon, the inspection device 22 detects, for example, the amplitude level of the ripple current of the output current Iout and inspects whether the rectifier circuit 30 or the capacitor 31 is abnormal. Further, for example, when the rectifier circuit 30 or the control device 33 fails, the current included in the output current Iout changes with the current that changes at the frequency of the three-phase AC voltage Vr or the harmonic frequency of the frequency of the three-phase AC voltage Vr. The changing current increases. Therefore, the inspection device 22 detects a current that changes at the frequency of the three-phase AC voltage Vr and a current that changes at a higher harmonic frequency of the frequency of the three-phase AC voltage Vr in the output current Iout. Detect the presence or absence of abnormalities.

  Note that the DC power supply device 10 corresponds to a power supply device, and the current transformer 21 and the inspection device 22 correspond to a power supply inspection device.

== Configuration of Power Supply Device 20 ==
Here, the configuration of the power supply device 20 will be described. The rectifier circuit 30 is a circuit that rectifies and outputs input three-phase AC voltages Vr, Vs, and Vt, and includes thyristors 50 to 52 and diodes 60 to 62. The thyristors 50 to 52 and the diodes 60 to 62 constitute a so-called bridge circuit.

  The capacitor 31 smoothes the voltage rectified by the rectifier circuit 30 and generates a DC output voltage Vout. One end of the capacitor 31 is connected to the power supply line 35 via the power distribution breaker 40, and the other end of the capacitor 31 is connected to the power supply line 36 via the power distribution breaker 41.

  The storage battery 32 is connected between the power lines 35 and 36. For example, when the three-phase AC voltages Vr, Vs, and Vt are not input to the rectifier circuit 30 due to a power failure or the like, a load connected to the power lines 35 and 36 is used. Supply DC power. The storage battery 32 is charged so that the battery voltage Vbat of the storage battery 32 matches the DC level of the output voltage Vout.

  The control device 33 is a device that controls the firing angles of the thyristors 50 to 52 so that the DC level of the output voltage Vout becomes a predetermined level based on the DC level of the output voltage Vout. Although details will be described later, for example, when the level of the output voltage Vout is increased, the control device 33 increases the firing angle of the thyristors 50 to 52 and extends the ON period (operation period) of the thyristors 50 to 52. On the other hand, when lowering the level of the output voltage Vout, the control device 33 decreases the firing angle of the thyristors 50 to 52 and shortens the ON period of the thyristors 50 to 52. Moreover, the control apparatus 33 controls the thyristors 50-52 based on the instruction | indication from the test | inspection apparatus 22 mentioned later. Specifically, when an instruction to evenly charge the storage battery 32 is input from the inspection device 22, the firing angle of the thyristors 50 to 52 is increased so that the DC level of the output voltage Vout increases from the voltage V1 to the voltage V2. To do. As a result, since the battery voltage Vbat of the storage battery 32 also increases from the voltage V1 to the voltage V2, the storage battery 32 is so-called equally charged.

  The distribution circuit breakers 40 and 41 are circuit breakers for protecting the rectifier circuit 30 and the capacitor 31 from overcurrent. Each of the power distribution circuit breakers 42 to 45 is a circuit breaker for protecting a connected load from overcurrent. Note that the above-described devices (not shown) such as the relay are connected between the power distribution breakers 42 and 43, for example, so that the power of the output voltage Vout is supplied.

== Operation of the Power Supply Device 20 ==
Here, when the firing angles of the thyristors 50 to 52 are 180 degrees, when all of the rectifying elements included in the rectifying circuit 30 are normal, and when any one of the rectifying elements has an open failure, for example. The operation of the power supply device 20 will be described. Here, the power supply device 20 supplies power to a resistor (not shown) included in a relay (not shown) connected as a load. That is, in this embodiment, a resistance load is equivalently connected between the distribution circuit breakers 42 and 43.

<< When the firing angle of the thyristors 50 to 52 is 180 degrees and the rectifying element is normal >>
FIG. 2 is a diagram for explaining main waveforms of the power supply device 20 when the firing angles of the thyristors 50 to 52 are 180 degrees and all of the rectifier elements included in the rectifier circuit 30 are normal. . Note that the period from time t0 to t6 is one period of each of the three-phase AC voltages Vr, Vs, and Vt.

  First, at time t0, the three-phase AC voltage Vr is the highest and the three-phase AC voltage Vs is the lowest. For this reason, the thyristor 50 and the diode 61 operate and turn on. Between time t0 and time t1, the difference between the three-phase AC voltages Vr and Vs increases and then decreases. For this reason, the output voltage Vout of the capacitor 31 rises from time t0 to the time when the difference between the three-phase AC voltages Vr and Vs becomes the largest, and then falls. At time t1, since the three-phase AC voltage Vt becomes lower than the three-phase AC voltage Vs, the thyristor 50 and the diode 62 are turned on. Between the times t1 and t2, the difference between the three-phase AC voltages Vr and Vt increases and then decreases. For this reason, the output voltage Vout rises from time t1 to the time when the difference between the three-phase AC voltages Vr and Vt becomes the largest, and then falls.

  At time t2, the three-phase AC voltage Vs becomes higher than the three-phase AC voltage Vr. For this reason, the thyristor 51 and the diode 62 are turned on. Further, the output voltage Vout between time t2 and time t3 changes similarly to time t0 to time t1. At time t3, since the three-phase AC voltage Vr becomes lower than the three-phase AC voltage Vt, the thyristor 51 and the diode 60 are turned on. Further, the output voltage Vout between time t3 and time t4 changes similarly to time t0 to time t1.

  At time t4, the three-phase AC voltage Vt becomes higher than the three-phase AC voltage Vs, so that the thyristor 52 and the diode 60 are turned on. Further, the output voltage Vout between time t4 and t5 changes in the same manner as time t0 to t1. At time t5, since the three-phase AC voltage Vs is the lowest than the three-phase AC voltage Vr, the thyristor 52 and the diode 61 are turned on. Further, the output voltage Vout between time t5 and time t6 changes in the same manner as time t0 to time t1. Then, after time t6, the operation from time t0 to time t6 is repeated. Thus, when all the rectifying elements included in the rectifying circuit 30 are normal, the output voltage Vout has a waveform obtained by full-wave rectifying the three-phase AC voltages Vr, Vs, and Vt. Further, the output voltage Vout includes six peaks as shown in FIG. 2 in one period of the three-phase AC voltage Vr.

  As described above, since the power supply device 20 drives the resistive load, the output current Iout changes in the same manner as the output voltage Vout. Therefore, the output current Iout changes at a frequency that is six times the frequency of the three-phase AC voltage Vr.

<< When the thyristors 50 to 52 have an ignition angle of 180 degrees and the thyristor 51 is abnormal >>
FIG. 3 is a diagram for explaining main waveforms of the power supply device 20 when the firing angle of the thyristors 50 to 52 is 180 degrees, and the thyristor 51 has an open failure, for example. The thyristors 50 and 52 operate in the same manner as described with reference to FIG. That is, the output voltage Vout in the period from the time t0 to t2 when the three-phase AC voltage Vr is the highest and the period from the time t4 to t6 when the three-phase AC voltage Vt is the highest vary in the same way as in FIG. Therefore, detailed description is omitted.

  When the thyristor 51 is in an open failure, the three-phase AC voltage Vs is the highest, and the thyristor 51 remains off during the time t2 to t4 when the thyristor 51 should be turned on. That is, the thyristor 51 is not turned on at a predetermined timing according to the levels of the three-phase AC voltages Vr, Vs, and Vt. As a result, the output voltage Vout decreases between the times t2 and t4, and the output current Iout similarly decreases. Therefore, the ripple current of the output current Iout increases as compared with, for example, the case shown in FIG. Furthermore, the output current Iout greatly decreases only once within one period of the three-phase AC voltage Vr. For this reason, among the currents included in the output current Iout, the current that changes at the frequency of the three-phase AC voltage Vr increases.

<< When the firing angle of the thyristors 50 to 52 is 90 degrees and the rectifying element is normal >>
FIG. 4 is a diagram for explaining main waveforms of the power supply device 20 when the firing angles of the thyristors 50 to 52 are 90 degrees and all of the rectifier elements included in the rectifier circuit 30 are normal. . Note that the period from time t10 to t16 is one period of each of the three-phase AC voltages Vr, Vs, and Vt.

  Here, in the period from time t10 to t12, the three-phase AC voltage Vr becomes maximum, so that the thyristor 50 can be turned on. The control device 33 according to the present embodiment turns off the thyristor 50 during, for example, a period of 50% from the time t11 to t12 among the times t10 to t12 in which the thyristor 50 can be turned on. The control device 33 turns off the thyristor 51 during, for example, a period of 50% from the time t13 to t14 among the times t12 to t14 in which the thyristor 51 can be turned on. Further, the control device 33 turns off the thyristor 52 during a period of 50% from the time t15 to t16 among the times t14 to t16 during which the thyristor 52 can be turned on.

  As a result, the three-phase AC voltages Vr, Vs, and Vt are rectified only during times t10 to t11, t12 to t13, and t14 to t15. Therefore, the output voltage Vout rises three times during one period. Since the output current Iout changes in the same manner as the output current Vout, the output current Vout changes at a frequency that is three times the frequency of the three-phase AC voltage Vr.

<< When the firing angle of the thyristors 50 to 52 is 90 degrees and the rectifying element is abnormal >>
FIG. 5 is a diagram for explaining main waveforms of the power supply device 20 when the thyristor 51 has an open failure when the firing angles of the thyristors 50 to 52 are controlled at 90 degrees. The operation of the thyristors 50 and 52 is the same as that shown in FIG.

  When the thyristor 51 is in an open failure, the three-phase AC voltage Vs is the highest, and the thyristor 51 remains off during the on-times t12 to t13. As a result, the output voltage Vout increases during the period from time t10 to t11 and during the period from time t14 to t15, but decreases between time t11 and t14. Therefore, the output current Iout increases greatly twice only in one period of the three-phase AC voltage Vr. Therefore, the current included in the output current Iout has a frequency twice that of the three-phase AC voltage Vr. The changing current increases. Further, as shown in FIG. 5, since the output voltage Vout greatly decreases during the times t11 to t14, the ripple current of the output current Iout increases as compared with the case shown in FIG. 2, for example.

<< Change in output current Iout when the capacitance of the capacitor 31 decreases >>
Here, a change in the output current Iout when the capacitance value of the capacitor 31 is lowered due to aging or the like will be described with reference to FIGS.
When the capacitance value of the capacitor 31 decreases due to aging or the like, the impedance of the capacitor 31 increases, so that the ripple current of the output current Iout hardly flows to the capacitor 31. For this reason, when the capacitance value of the capacitor 31 decreases, the ripple current of the output current Iout increases. Note that the amplitude level of the ripple current increases as the capacitance value of the capacitor 31 decreases.

== Characteristics of output current Iout ==
FIG. 7 is a graph summarizing the characteristics of the output current Iout in each case described above. In FIG. 7, “fundamental wave” means a current that changes at the frequency of the three-phase AC voltage Vr in the output current Iout, and “secondary” means a three-phase AC voltage Vr in the output current Iout. Means a current that changes at a frequency twice as high as the frequency (hereinafter referred to as a second harmonic current). Further, “third order” means a current that changes at a frequency three times the frequency of the three-phase AC voltage Vr in the output current Iout (hereinafter referred to as a third harmonic current). The term “current” means a current that changes at a frequency six times the frequency of the three-phase AC voltage Vr in the output current Iout (hereinafter referred to as a sixth harmonic current). “Increase” means that the amplitude level of the target current increases, and “small” means that the change in the amplitude level of the target current is small.

  When the capacitance value of the capacitor 31 decreases, for example, as shown in FIG. 6, the ripple current in the output current Iout increases. Further, when the firing angle of the thyristors 50 to 52 is large (for example, 180 or the like), the sixth harmonic current is the main current as shown in FIG. 2 in the AC component of the output current Iout. On the other hand, when the firing angle of the thyristors 50 to 52 is small (for example, 90 degrees), the third harmonic current is the main current as shown in FIG. 4 in the AC component of the output current Iout. Therefore, when the capacitance value of the capacitor 31 decreases, the ripple current increases and the third harmonic current or the sixth harmonic current included in the ripple current increases.

  Further, if there is a defect such as an open failure in the thyristors 50 to 52 and the diodes 60 to 62 that are rectifier elements, a period in which the rectifier elements are not turned on occurs, so that the output voltage Vout always decreases. For this reason, in such a case, the ripple current in the output current Iout increases. Further, when the firing angle of the thyristors 50 to 52 is large (for example, 180, etc.), if there is an open failure or the like in the rectifier, as shown in FIG. The current increases. Further, when the firing angle of the thyristors 50 to 52 is small (for example, 90 degrees, for example), if there is an open failure or the like in the rectifying element, the second of the alternating current components of the output current Iout as shown in FIG. Harmonic current increases.

  Here, the case where the rectifying element has an open failure has been described. For example, when the control device 33 fails and the thyristors 50 to 52 cannot be turned on, or when the thyristors 50 to 52 cannot be turned on at a desired timing. The output current Iout is the same as that shown in FIGS. That is, even when a failure occurs in the control device 33, the fundamental wave current or the second harmonic current in the output current Iout increases.

== Details of Inspection Device 22 ==
Here, details of the inspection apparatus 22 shown in FIG. 1 will be described. The inspection device 22 inspects whether the rectifier circuit 30, the capacitor 31, and the control device 33 are abnormal based on the output current Iout.

  The inspection device 22 includes an AD converter (ADC) 80, a storage device 81, a microcomputer 82, an interface circuit (IF) 83, and a display 84.

  The AD converter 80 converts the analog output current Iout measured by the current transformer 21 into a digital value. The storage device 81 stores program data executed by the microcomputer 82 and various data.

  The microcomputer 82 implements various functions by executing the program data stored in the storage device 81. Specifically, the microcomputer 82 implements the functions of a DC detection unit 90, an AC detection unit 91, a determination unit 92, and a processing unit 93 as shown in FIG.

  The DC detection unit 90 detects a DC component of the output current Iout, that is, a DC level, based on the digitized output current Iout.

  The AC detector 91 detects the AC component in the output current Iout, that is, the amplitude level of the ripple current, based on the digitized output current Iout. In addition, the AC detector 91 performs a Fourier transform on the digitized output current Iout to detect a fundamental current that changes at the frequency of the three-phase AC voltage Vr and second to sixth harmonic currents.

  The determination unit 92 determines whether there is an abnormality in the rectifier circuit 30, the capacitor 31, and the control device 33 based on the detection results of the DC detection unit 90 and the AC detection unit 91. The determination unit 92 determines the ratio between the DC level of the output current Iout and the amplitude level of the ripple current, that is, the ratio of the ripple current to the DC component (ripple current / DC current), the fundamental current, and the second to sixth harmonics. Calculate each amplitude level of the current.

  The determination unit 92 determines that any of the rectifier circuit 30, the capacitor 31, and the control device 33 is abnormal when the ratio of the ripple current is equal to or greater than a predetermined value. The determination unit 92 determines whether or not there is an abnormality in the rectifier circuit 30 or the like based on the amplitude levels of the fundamental current and the second to sixth harmonic currents. Specifically, the determination unit 92 determines that there is an abnormality in the rectifier 30 or the control device 33 when the amplitude of the fundamental current or the second harmonic current is maximum. The determination unit 92 determines that the capacitor 31 is abnormal when the amplitude level of the third harmonic current is equal to or higher than the predetermined level or when the amplitude level of the sixth harmonic current is higher than the predetermined level.

  When the DC level of the output current Iout is smaller than the predetermined value, the processing unit 93 outputs an equal charge instruction for starting equal charge of the storage battery 32 to the control device 33 via the interface circuit 83. In addition, when the equal charge of the storage battery 32 is started, since the firing angle of the thyristors 50 to 52 is increased as described above, the DC level of the output current Iout is increased. In addition, the processing unit 93 causes the display unit 84 to display the ratio of the ripple current, the fundamental wave, the amplitude level of the harmonic current, and the like calculated by the determination unit 92. Further, when the determination unit 92 determines that the rectifier circuit 30 or the like is abnormal, the processing unit 93 records the ripple current ratio, the waveform such as the fundamental wave and the harmonic current, and the determined time in the storage device 81. To do. In addition, when the determination unit 92 determines that there is an abnormality in the rectifier circuit 30 or the like, the processing unit 93 outputs an alarm indicating that there is an abnormality to the interface circuit 83.

  The interface circuit 83 outputs an equal charge instruction to the control device 33 based on an instruction from the processing unit 93 and outputs an alarm to the outside of the DC power supply device 10.

  The display 84 is a display panel that displays a ripple current ratio, a fundamental wave, an amplitude level of a harmonic current, and the like. For this reason, although details will be described later, for example, the user can determine whether or not there is an abnormality in the rectifier circuit 30 or the like by checking the panel of the display 84.

== Example of processing of inspection device 22 ==
Here, an example of processing in which the inspection device 22 inspects whether or not the DC power supply device 10 has an abnormality will be described with reference to FIG. 9. For example, the inspection device 22 performs the process shown in FIG. 9 at predetermined intervals. 9 is a functional block realized by the microcomputer 82.

  First, the DC detection unit 90 detects the DC level of the output current Iout (S100). And the process part 93 determines whether the direct current | flow level of the output current Iout detected by the direct current | flow detection part 90 is more than predetermined (S101). When the DC level is equal to or higher than the predetermined level (S101: YES), the DC detection unit 90 detects the DC level of the output current Iout, and the AC detection unit 91 detects the ripple current and the fundamental wave current that are AC components of the output current Iout. The second to sixth harmonic currents are detected (S104). On the other hand, when the DC level is not equal to or higher than the predetermined level (S101: NO), the processing unit 93 outputs an equal charge instruction to start equal charge of the storage battery 32 (S102). When the process S102 is executed, since the equal charge of the storage battery 23 is started, the output current Iout starts to increase. Then, when a certain time required for the output current Iout to sufficiently increase has elapsed (S103: YES), the processing unit 93 causes the DC detection unit 90 to detect the DC level of the output current Iout and causes the AC detection unit 91 to detect the ripple current. The fundamental current and the second to sixth harmonic currents are detected (S104). When the process S104 is executed, the determination unit 92 calculates the ripple current ratio, the fundamental current, and the amplitude levels of the second to sixth harmonic currents based on the detection result in the process S104. (S105). The processing unit 93 causes the display unit 84 to display the ripple current ratio and the amplitude levels of the fundamental wave and the harmonic current calculated by the determination unit 92 (S106). Then, the determination unit 92 performs a determination process as to whether or not there is an abnormality in the DC power supply device 10 based on the ratio of the ripple current and the amplitude levels of the fundamental wave and the harmonic current (S107).

  Here, the determination process S107 is, for example, a process as shown in FIG. Details of the determination process will be described below. First, the determination unit 92 determines whether the ratio of the ripple current is greater than or equal to a predetermined value (S200). When the ratio of the ripple current is equal to or greater than the predetermined value (S200: YES), the determination unit 92 determines that at least one of the rectifier circuit 30, the capacitor 31, and the control device 33 is abnormal (S201). On the other hand, when the ratio of the ripple current is not equal to or greater than the predetermined value (S200: NO), the determination unit 92 determines the current having the maximum level among the fundamental wave and the harmonic current (S202). When the current with the maximum level is the current of the fundamental wave or the second harmonic current (S202: fundamental wave, second harmonic), the determination unit 92 has an abnormality in the rectifier circuit 30 or the control device 33. It is determined that there is (S203). On the other hand, when the current having the maximum level is other than the fundamental current and the second harmonic current (S202: other than the fundamental and second harmonic), the determination unit 92 determines that the third harmonic current is greater than or equal to a predetermined value. Or whether the sixth harmonic current is greater than or equal to a predetermined value (S204). If the third harmonic current is equal to or greater than the predetermined value or the sixth harmonic current is equal to or greater than the predetermined value (S204: YES), the determination unit 92 determines that the capacitor 31 is abnormal (S205). On the other hand, when the third harmonic current is not less than the predetermined value or the sixth harmonic current is not greater than the predetermined value (S204: NO), the determination unit 92 determines that the DC power supply device 10 has no abnormality (S206).

  Then, as shown in FIG. 9, when the determination unit 92 determines that there is an abnormality (S108: YES), the processing unit 93 determines the ripple current ratio, the waveform of the fundamental wave, the harmonic current, and the time determined. Is stored in the storage device 81, and an alarm indicating that there is an abnormality is output (S109). On the other hand, when the determination unit 92 determines that there is no abnormality (S108: NO), the process ends.

  The DC power supply device 10 according to this embodiment has been described above. In the present embodiment, for example, whether or not there is an abnormality in the rectifier circuit 30 or the like is determined based on the ratio of the ripple current or the like. For example, the presence or absence of an abnormality is determined based only on the magnitude of the ripple current. May be. For example, as shown in FIGS. 3 and 5, the ripple current increases when the thyristors 50 to 52 and the diodes 60 to 62 are not turned on at a predetermined timing corresponding to the three-phase AC voltages Vr, Vs, and Vt. Further, as shown in FIG. 6, when the capacitance value of the capacitor 31 decreases from a predetermined value (for example, a value at the time of shipment), the ripple current increases. Therefore, based on only the magnitude of the ripple current, it can be determined that the thyristors 50 to 52 and the like are not turned on at a predetermined timing, and that the capacitance value of the capacitor 31 is reduced. In such a case, the abnormality of the DC power supply device 10 can be detected without stopping the DC power supply device 10. Further, when an abnormality is detected, the user can stop the DC power supply device 10 and replace the failed element. For this reason, since it is possible to prevent the DC power supply device 10 from operating in a failed state, the burden on the DC power supply device 10 can be reduced. Furthermore, when the failed element is replaced, the ripple current in the output current Iout becomes small. For this reason, the influence on the load driven by the DC power supply device 10 is also reduced. Also, when detecting harmonics and the like included in the output voltage Vout, it is possible to specify the failure location. However, the output voltage Vout is more susceptible to the load driven by the DC power supply device 10 than the output current Iout. For this reason, by measuring the output current Iout, it is possible to specify the fault location with high accuracy.

  In general, when the load of the DC power supply 10 is small, the change in the ripple current is small. For this reason, it may be difficult to detect an abnormality in the rectifier circuit 30 or the like based only on the ripple current. The determination unit 92 according to the present embodiment determines an abnormality of the thyristor 50 or the like based on the ratio between the DC level of the output current Iout and the amplitude level of the ripple current, that is, the ratio of the ripple current (for example, processing S200). ). Therefore, for example, the determination can be made with higher accuracy than in the case of determining abnormality based only on the ripple current.

  Further, each of the direct current detection unit 90 and the alternating current detection unit 91 detects the direct current component and the ripple current of the output current Iout while the storage battery 23 is being charged uniformly and rising from the voltage V1 to the voltage V2 (for example, , Processing S102 to S104). Therefore, for example, the output current Iout can be increased regardless of the load driven by the DC power supply device 10. Since the determination unit 92 determines an abnormality in the rectifier circuit 30 or the like based on the ripple current or the like detected when the output current Iout increases, the determination accuracy can be improved.

  Further, the determination unit 82 determines whether or not there is an abnormality in the rectifier circuit 30 or the like based on the current of the fundamental wave and the harmonic current, as in the processes S202 to S206, for example. Thus, for example, even when the ratio of the ripple current is not used, it is possible to determine whether there is an abnormality in the rectifier circuit 30 or the like.

  In addition, when the load current of the DC power supply device 10 is small, for example, even when the rectifier circuit 30 or the like is out of order, an increase in the fundamental current and the harmonic current included in the output current Iout is suppressed. The AC detection unit 91 detects the current of the fundamental wave and the second to sixth harmonic currents while the storage battery 23 is charged uniformly and rises from the voltage V1 to the voltage V2 (for example, processing S102 to S104). ). For this reason, in this embodiment, the accuracy of determination of the presence or absence of abnormality can be improved.

  Further, when the rectifier circuit 30 is operating as a so-called full-wave rectifier circuit, for example, if any of the rectifier elements of the rectifier circuit 30 fails, the fundamental current increases in the output current Iout. In this way, the determination unit 92 performs the determination process (S107) using the fundamental current detected by the AC detection unit 91 while taking into account the characteristics of the output current Iout. For this reason, the determination unit 92 can determine whether or not the rectifying element operates at a predetermined timing, that is, whether the rectifying element is turned on at the predetermined timing (for example, processing S202 and S203). If the rectifying element does not turn on at a predetermined timing, either the rectifying circuit 30 or the control device 33 is out of order, so that it is possible to identify the failed part.

  In addition, when the rectifier circuit 30 operates as a so-called full-wave rectifier circuit, the amplitude level of the sixth harmonic current increases when the capacitance of the capacitor 31 decreases. In this way, the determination unit 92 performs the determination process (S107) using the sixth harmonic current detected by the AC detection unit 91 while taking into consideration the characteristics of the output current Iout. For this reason, the determination part 92 can determine whether the capacity | capacitance of the capacitor | condenser 31 is a predetermined value (for example, process S204). When the capacity of the capacitor 31 is not a predetermined value, the capacitor 31 has deteriorated over time or has failed, and it can be specified that an abnormality has occurred in the capacitor 31.

  Moreover, since the rectifier circuit 30 includes the thyristors 50 to 52, the second harmonic current may increase if any of the rectifier elements of the rectifier circuit 30 has a failure. In this way, the determination unit 92 performs the determination process (S107) using the fundamental current or the second harmonic current while taking into consideration the characteristics of the output current Iout. Therefore, the determination unit 92 can determine whether or not the rectifying element is turned on at a predetermined timing regardless of the firing angles of the thyristors 50 to 52 (for example, processes S202 and S203).

  Moreover, since the rectifier circuit 30 includes the thyristors 50 to 52, the amplitude level of the third harmonic current may increase when the capacitance of the capacitor 31 decreases. In this way, the determination unit 92 performs the determination process (S107) using the third harmonic current and the sixth harmonic current while taking into account the characteristics of the output current Iout. For this reason, the determination part 92 can determine whether the capacity | capacitance of the capacitor | condenser 31 is a predetermined value irrespective of the firing angle of the thyristors 50-52 (for example, process S204).

  Further, the output current Iout may be measured by the current transformer 21, the ripple current may be detected based on the measurement result of the current transformer 21, and the failure location may be determined based on the detection result.

  The above-described embodiment is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention is changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  In the present embodiment, all of the processes S200, S202, and S204 are executed, but any one process may be performed.

  Although the current transformer 21 and the inspection device 22 are provided inside the DC power supply device 10, they may be provided outside.

  Further, the rectifier circuit 30 may be configured entirely with diodes or may be configured with all thyristors. The rectifier circuit 30 may be a half-wave rectifier circuit. In this case, since an output current Iout similar to that when the firing angle is 90 degrees is output, the abnormality of the rectifier circuit 30 and the like can be detected by using the inspection device 22.

  Further, an abnormality such as a rectifier circuit included in a general AC-DC converter that does not include the storage battery 32 can be detected by using the current transformer 21 and the inspection device 22.

  Further, in the DC power supply device 10, for example, even when an LC filter or the like is provided between the capacitor 31 and the storage battery 32, the rectifier circuit 30 is detected by detecting the output current Iout output from the capacitor 31. And the like can be detected.

  Moreover, it is good also as detecting the electric current output to load from LC filter etc. which were mentioned above. In such a case, the level of the harmonic component or the like is attenuated by the LC filter, but the frequency component of the current output from the LC filter is the same as in this embodiment. For this reason, it is possible to detect an abnormality in the rectifier circuit 30 and the like as in the present embodiment.

  In step S202, it is determined whether the fundamental wave current is maximized. For example, the amplitude level of the fundamental wave current may be compared with a predetermined level.

10 DC power supply device 20 Power supply device 21 Current transformer 22 Inspection device
DESCRIPTION OF SYMBOLS 30 Rectifier circuit 31 Capacitor 32 Storage battery 33 Control apparatus 35, 36 Power supply line 40-45 Power distribution breaker 50-52 Thyristor 60-62 Diode 80 AD converter 81 Memory | storage device 82 Microcomputer 83 Interface circuit 84 Display 90 DC detection part 91 AC Detection unit 92 Determination unit 93 Processing unit

Claims (10)

A rectifier circuit including a rectifier that rectifies an input three-phase AC voltage, and a capacitor that smoothes the output of the rectifier circuit, the rectifier circuit of a power supply device, and a measurement unit that measures an output current from the capacitor When,
An AC detection unit that detects an AC component of the output current based on a measurement result of the measurement unit;
Based on the measurement result of the measurement unit, a DC detection unit that detects a DC component of the output current;
Based on the ratio of the direct current component of the output current detected by the direct current detection unit and the alternating current component of the output current detected by the alternating current detection unit, the rectifying element is responsive to the level of the three-phase alternating current voltage. A determination unit that determines whether the capacitance value of the capacitor is a predetermined value while operating at a predetermined timing ;
A power supply inspection device comprising: The power supply inspection device according to claim 1,
The power supply device
A storage battery that is charged when the output current is supplied;
The AC detection unit
Based on the measurement result of the measurement unit while the charging voltage of the storage battery is rising from the first level to the second level, the AC component of the output current is detected,
The DC detection unit is
Detecting a direct current component of the output current based on a measurement result of the measurement unit while the charging voltage is rising from the first level to the second level;
Power supply inspection device characterized by An output from the full-wave rectifier circuit and the capacitor of a power supply device comprising: a full-wave rectifier circuit including a rectifier that rectifies an input three-phase AC voltage; and a capacitor that smoothes the output of the full-wave rectifier circuit. A measuring section for measuring current;
Based on the measurement result of the measurement unit, an AC detection unit that detects a fundamental current that changes at a frequency of any one of the three-phase AC voltages and a harmonic current with respect to the fundamental, and
Based on the detection result of the AC detection unit, whether the rectifying element operates at a predetermined timing according to the level of the three-phase AC voltage, whether the capacitance value of the capacitor is a predetermined value, A determination unit for determining
Power supply inspection device characterized by The power supply inspection device according to claim 3 ,
The power supply device
A storage battery that is charged when the output current is supplied;
The AC detection unit
Detecting the current of the fundamental wave and the harmonic wave based on the measurement result of the measurement unit while the charging voltage of the storage battery is rising from the first level to the second level ;
Power supply inspection device characterized by The power supply inspection device according to claim 3 or 4,
The determination unit
When the current of the fundamental wave among the currents of the fundamental wave and harmonics detected by the AC detection unit becomes maximum, the rectifying element is operating at the predetermined timing according to the level of the three-phase AC voltage. Determining that there is no,
Power supply inspection device characterized by The power supply inspection device according to any one of claims 3 to 5 ,
The determination unit
Determining that the capacitance value of the capacitor is not the predetermined value when the current of the sixth harmonic detected by the AC detection unit is equal to or greater than a predetermined value ;
Power supply inspection device characterized by The power supply inspection device according to any one of claims 3 to 6 ,
The full-wave rectifier circuit includes a thyristor as the rectifier element,
The power supply device further includes a control device that controls the thyristor based on the output voltage so that an output voltage output from the power supply device becomes a predetermined voltage.
The determination unit
When the current of the fundamental wave or the current of the second harmonic becomes the maximum among the currents of the fundamental wave and the harmonic wave, the rectifying element is operating at the predetermined timing according to the level of the three-phase AC voltage. possible to determine that there is no,
Power supply inspection device characterized by The power supply inspection device according to claim 7 ,
The determination unit
Determining that the capacitance value of the capacitor is not the predetermined value when the third harmonic current exceeds a predetermined value or the sixth harmonic current exceeds a predetermined value ;
Power supply inspection device characterized by Measuring the output current from the rectifier circuit and the capacitor of the power supply device comprising a rectifier circuit including a rectifier that rectifies the input three-phase AC voltage, and a capacitor that smoothes the output of the rectifier circuit;
Based on the measurement result of the measurement unit, the AC component of the output current is detected,
Based on the measurement result of the measurement unit, the DC component of the output current is detected,
Based on the ratio of the direct current component of the output current detected by the direct current detection unit and the alternating current component of the output current detected by the alternating current detection unit, the rectifying element is responsive to the level of the three-phase alternating current voltage. Determining whether the capacitance value of the capacitor is a predetermined value while operating at a predetermined timing;
Power supply inspection method characterized by . A power supply device that generates an output voltage from an input three-phase AC voltage,
A rectifying circuit including a rectifying element for rectifying the three-phase AC voltage;
A capacitor for smoothing the output of the rectifier circuit to generate the output voltage;
The output current from the rectifier circuit and the capacitor is measured, and whether or not the capacitance value of the capacitor is a predetermined value while the rectifier element operates at a predetermined timing according to the level of the three-phase AC voltage An inspection device for judging;
With
The inspection device includes:
A measurement unit for measuring the output current;
An AC detection unit that detects an AC component of the output current based on a measurement result of the measurement unit;
Based on the measurement result of the measurement unit, a DC detection unit that detects a DC component of the output current;
Based on the ratio of the direct current component of the output current detected by the direct current detection unit and the alternating current component of the output current detected by the alternating current detection unit, the rectifying element is responsive to the level of the three-phase alternating current voltage. A determination unit that determines whether the capacitance value of the capacitor is a predetermined value while operating at a predetermined timing;
A power supply device comprising:

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