Power regulator and power regulation control program

Abstract

Provided is a power adjustment device for three-phase six-arm which controls, via phase control, the supply of power with respect to a load from a three-phase AC power source, said power adjustment device being capable of being used also for single phase, three-phase three-arm, etc.　A power adjustment device 1 comprises: a power source waveform acquisition unit 12 which acquires phase information of a three-phase AC power source; AC control circuits 13A-C to which a thyristor is connected in anti-parallel; and a control unit 11 which, in a three-phase six-arm control mode, outputs a trigger signal based on a three-phase six-arm trigger angle and the phase information with respect to the thyristor compatible with the polarity of the phase information, which, in a single phase control mode, outputs a trigger signal based on a single phase trigger angle and the phase information with respect to the thyristor compatible with the polarity of the phase information, and which, in a three-phase three-arm control mode, outputs a trigger signal based on a three-phase three-arm trigger angle and the phase information with respect to the thyristor compatible with the polarity of the phase information.

Description

[Technical Field]

[0001] The present invention relates to a power regulator and a power regulation control program that controls power supply from a three-phase AC power supply to a load by phase control. [Background technology]

[0002] Power regulators that control the power supply from an AC power source to a load by phase control have been used for some time. In this regard, Patent Document 1 discloses a technique relating to a three-phase AC phase control method. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-113545 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional power regulators have typically been configured for single-phase applications, three-phase three-arm applications, and three-phase six-arm applications, each of which is specifically designed for that application (Patent Document 1 is an example of a three-phase six-arm application).

[0005] In view of the above, an object of the present invention is to provide a power regulator for three-phase six arms that controls the power supply from a three-phase AC power source to a load by phase control, and that can be used for single-phase (and three-phase four-wire) or three-phase three-arm applications, or both. [Means for solving the problem]

[0006] (Configuration 1) a trigger angle calculation unit that calculates a three-phase six-arm trigger angle for the unidirectional current control element in a three-phase six-arm control mode and a single-phase trigger angle for the unidirectional current control element in a single-phase control mode or a three-phase four-wire control mode; and a trigger control unit that outputs a trigger signal for the unidirectional current control element, wherein in the three-phase six-arm control mode, the trigger signal based on the phase information and the three-phase six-arm trigger angle is output to the unidirectional current control element that matches the polarity of the phase information, and in the single-phase control mode or the three-phase four-wire control mode, the trigger signal is output to the unidirectional current control element that matches the polarity of the phase information.

[0007] (Configuration 2) a trigger angle calculation unit that calculates a trigger angle corresponding to a target load factor, the trigger angle calculation unit calculating a three-phase six-arm trigger angle for the unidirectional current control element in a three-phase six-arm control mode and a three-phase three-arm trigger angle for the unidirectional current control element in a three-phase three-arm control mode; and a trigger control unit that outputs a trigger signal for the unidirectional current control element, wherein in the three-phase six-arm control mode, the trigger signal based on the phase information and the three-phase six-arm trigger angle is output to the unidirectional current control element that matches the polarity of the phase information, and in the three-phase three-arm control mode, the power regulator outputs a trigger signal that steadily turns on the unidirectional current control element of one polarity, and outputs a trigger signal based on the phase information and the three-phase three-arm trigger angle to the unidirectional current control element of the other polarity.

[0008] (Configuration 3) A power regulator that controls power supply to a load from a three-phase AC power supply by phase control, the power supply phase acquisition unit acquiring phase information of a line voltage of the three-phase AC power supply, an AC current control circuit in which unidirectional current control elements corresponding to each phase are connected in anti-parallel, and a trigger angle calculation unit that calculates a trigger angle corresponding to a target load factor, the trigger angle calculation unit calculating a three-phase six-arm trigger angle for the unidirectional current control element in a three-phase six-arm control mode, a single-phase trigger angle for the unidirectional current control element in a single-phase control mode or a three-phase four-wire control mode, and a three-phase three-arm trigger angle for the unidirectional current control element in a three-phase three-arm control mode. a trigger control unit that outputs a trigger signal based on the phase information and the three-phase six-arm trigger angle to the unidirectional current control element that matches the polarity of the phase information in the three-phase six-arm control mode, and outputs a trigger signal based on the phase information and the single-phase trigger angle to the unidirectional current control element that matches the polarity of the phase information in the single-phase control mode or the three-phase four-wire control mode, and outputs a trigger signal that steadily turns on the unidirectional current control element of one polarity in the three-phase three-arm control mode, and outputs a trigger signal based on the phase information and the three-phase three-arm trigger angle to the unidirectional current control element of the other polarity.

[0009] (Configuration 4) 1. A program executed in a power regulator including a power supply phase acquisition unit that acquires phase information of line voltages of a three-phase AC power supply, and an AC current control circuit in which unidirectional current control elements corresponding to each phase are connected in anti-parallel, the program comprising the steps of: in a three-phase six-arm control mode, calculating three-phase six-arm trigger angles for the unidirectional current control elements, and outputting trigger signals based on the phase information and the three-phase six-arm trigger angles to the unidirectional current control elements that match the polarity of the phase information; and outputting a trigger signal based on the phase information and the single-phase trigger angle to the unidirectional current control element that matches the polarity of the phase information; and in a three-phase three-arm control mode, calculating a three-phase three-arm trigger angle for the unidirectional current control element, outputting a trigger signal that switches the unidirectional current control element of one polarity on steadily, and outputting a trigger signal based on the phase information and the three-phase three-arm trigger angle to the unidirectional current control element of the other polarity. [Effects of the Invention]

[0010] According to the power regulator and power regulation control program of the present invention, a three-phase six-arm power regulator that controls the power supply from a three-phase AC power source to a load by phase control can be adapted for single-phase (and three-phase four-wire) or three-phase three-arm applications, or both. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram showing an outline of the configuration of a power regulator according to an embodiment of the present invention. [Figure 2] A conceptual diagram of a connection when the power regulator of the embodiment is used for three-phase six-arm control (or three-phase three-arm control). [Figure 3] 1 is a conceptual diagram of a connection when the power regulator of the embodiment is used for single-phase control. [Figure 4] A conceptual diagram of a connection when the power regulator of the embodiment is used for three-phase four-wire control. [Figure 5] 1 is a flowchart illustrating a processing concept of a power regulator according to an embodiment. [Figure 6] A diagram showing the simulation conditions for the circuit simulator [Figure 7] Simulation results [Figure 8] Simulation results [Figure 9] Simulation results [Figure 10] Simulation results [Figure 11] Simulation results [Figure 12] Single-phase control diagram DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following embodiments are merely examples of how the present invention can be realized, and are not intended to limit the scope of the present invention.

[0013] 1 is a block diagram showing an outline of the configuration of a portion of a power regulator according to an embodiment of the present invention. The power regulator 1 of this embodiment is a power regulator that controls power supply to a load by phase control, and is capable of switching among three-phase six-arm phase control, single-phase phase control, three-phase three-arm phase control, and three-phase four-wire phase control using a single device. The power regulator 1 of this embodiment includes: a power supply waveform acquisition unit 12 that acquires a waveform of a line voltage of a three-phase AC power supply and also functions as a power supply phase acquisition unit that acquires phase information; AC current control circuits 13A-13C in which unidirectional current control elements are connected in anti-parallel, each corresponding to one of the three phases; a control unit 11 that functions as a trigger angle calculation unit that calculates a trigger angle corresponding to a target load factor, the trigger angle calculation unit calculating a three-phase six-arm trigger angle for each unidirectional current control element in a three-phase six-arm control mode, a single-phase trigger angle for each unidirectional current control element in a single-phase control mode or a three-phase four-wire control mode, and a three-phase three-arm trigger angle for each unidirectional current control element in a three-phase three-arm control mode, and a trigger control unit that outputs a trigger signal for each unidirectional current control element; It is equipped with: In addition, the power regulator 1 is provided with main circuit connection terminals 161A, 162A, 161B, 162B, 161C, and 162C, which are used for wiring to arrange AC current control circuits 13A-13C on the power supply line from the AC power source to the load, and input power terminals 15A-15D, which are used for wiring to acquire the power waveform in the power waveform acquisition unit 12.

[0014] The AC current control circuit 13A of this embodiment has a configuration in which unidirectional thyristors (131A, 132A) that are unidirectional current control elements are connected in antiparallel. The AC current control circuits 13B and 13C have a similar configuration. In the embodiment, the control unit 11 and the power supply waveform acquisition unit 12 are described separately, but the functional units are not limited to being configured individually as hardware. For example, all functions may be implemented as software on a single device such as a microcomputer. Conversely, any or all of the functional units may be implemented as hardware using a dedicated circuit or the like, and some or all of the functions (trigger angle calculation unit and trigger control unit) described in the present embodiment as processes executed as software on the control unit 11 may be implemented as hardware using a dedicated circuit or the like.

[0015] The basic function of the power regulator 1 is to control the power supply from the AC power supply 3 to the heater, which is the load 2, based on the target load factor (0 to 100%) input from a temperature regulator (not shown), which is an external device (see Figures 2-4). That is, the temperature regulator calculates the target load factor (manipulated variable MV) by feedback control such as PID control based on the deviation between the heater temperature and the target temperature, and this is input to the power regulator 1. The control unit 11 of the power regulator 1 calculates a target power value (or target voltage value, target current value, etc.) using the input target load factor, and calculates a trigger angle based on this target power value (or target voltage value, target current value, etc.). Based on the trigger angle, a trigger signal is output in accordance with the power supply waveform (polarity and phase of the AC power supply) to each of the thyristors 131A, 132A, 131B, 132B, 131C, and 132C of each of the AC current control circuits 13A-13C, thereby controlling the power supply to the load. Any of the various techniques can be used for the phase control, so further detailed explanation will be omitted here.

[0016] FIG. 2 is a conceptual diagram of wiring when the power regulator 1 is used for three-phase six-arm control. When power regulator 1 is used for three-phase six-arm control, main circuit connection terminals 161A, 162A, main circuit connection terminals 161B, 162B, and main circuit connection terminals 161C, 162C are connected to power supply lines 4A-4C of each phase from three-phase AC power supply 3 to three-phase load 2 (each load (heater) 2A-2C). In addition, power supply lines 4A-4C are connected to input power terminals 15A-15C, respectively. As a result, each AC current control circuit 13A-13C is connected to each power supply line 4A-4C, enabling switching of each power supply line 4A-4C, and the power supply waveform acquisition unit 12 is also connected to each power supply line 4A-4C, enabling acquisition of the power supply waveform (phase information) of each phase. The wiring is similar when the power regulator 1 is used for three-phase three-arm control.

[0017] In the following explanation, there may be cases where only one phase (basically the AC current control circuit 13A (and the unidirectional thyristors 131A, 132A)) is explained, but the other two phases (the AC current control circuits 13B, 13C) have a phase difference of just 120°, and the concept is the same.

[0018] (Three-phase 6-arm control) In the three-phase six-arm control mode, a trigger angle for the three-phase six arms is calculated, and trigger signals (first trigger signal and second trigger signal described below) based on the phase information and the trigger angle for the three-phase six arms are output to the unidirectional thyristors 131A, 132A that match the polarity of the phase information of the power waveform acquired by the power waveform acquisition unit 12. In this process, a trigger angle (180° to 30°) for the three-phase six-arm is calculated from the target load factor (0 to 100%) input from the temperature controller, and the thyristor (either 131A or 132A) that is in the direction of conduction according to the polarity of the power supply is triggered at the trigger angle for the three-phase six-arm (a first trigger signal is output). In addition, the same thyristor is triggered at a phase angle that is 60° behind the trigger angle for the three-phase six-arm (a second trigger signal is output). The trigger angle is defined as the starting point (0°) of the half cycle that starts and ends at the 0V point of the line voltage of the AC power supply, and the last 0V point is defined as 180°.

[0019] The "trigger angle for three-phase six-arm" is a phase angle in the range of 180° to 30°, and is 180° when the target load factor is 0% (i.e., output 0%) and 30° when the target load factor is 100% (i.e., output 100%). "Triggering at a phase angle delayed by 60° from the trigger angle for three-phase six-arm" is similar to what is described in Patent Document 1 as the "double pulse method." That is, as is clear from FIG. 2, for example, the line voltage V between the R phase and the S phase R-STo apply this to load 2B, power supply lines 4A and 4B must be conductive, that is, one positive-side thyristor and the other negative-side thyristor must be turned on in AC current control circuits 13A and 13B. In this way, "triggering at a phase angle delayed by 60° from the trigger angle for three-phase six arms" is intended to turn on the corresponding thyristor so that power is supplied in the power control of the other AC current control circuit (other phase).

[0020] Regarding the power regulator 1 of this embodiment, a simulation was performed using a circuit simulator for the case where it has the configuration shown in FIG. 2 (three-phase six-arm control). FIG. 6 shows the simulation conditions (when the trigger angle is 120°), and FIGS. 7 to 11 show the simulation results. Figure 7 shows the simulation results when the trigger angle is 150°, FIG. 8 shows the simulation results when the trigger angle is 120°, FIG. 9 shows the simulation results when the trigger angle is 90°, FIG. 10 shows the simulation results when the trigger angle is 60°, and FIG. 11 shows the simulation results when the trigger angle is 30°. The trigger angles in each simulation diagram indicate the relative angle from 180°, which is the last 0V point in the half cycle that starts and ends at the 0V point of the AC power line voltage. For example, FIG. 7 shows the case when the trigger angle is 150°, but in the figure, it is expressed as 30°, which is the relative angle from 180°. The simulation results in Figures 7 to 11 show the line voltages of the three-phase AC power supply (V(L1, L2), V(L2, L3), V(L3, L1)), the voltages across each of the three three-phase loads (V(U, V), V(V, W), V(W, U)), the line currents (I(Ru), I(Rv), I(Rw)), and the load currents of the three three-phase loads (I(Ruv), I(Rvw), I(Rwu)).

[0021] Referring to Figures 7 to 11, TR2p and TR2n are triggers (first trigger signals) for three-phase six-arm trigger angles of 150°, 120°, 90°, 60°, and 30° (30°, 60°, 90°, 120°, and 150° in the figures), and trigger TR2p is a trigger for the thyristor that conducts when the power supply phase is positive, and trigger TR2n is a trigger for the thyristor that conducts when the power supply phase is negative. TR3p and TR3n are triggers (second trigger signals) with a trigger angle delayed by 60° from the trigger angles (TR2p, TR2n) for the three-phase six-arm. As can be seen from FIGS. 7 to 11, the trigger TR2p and the TR3n of another phase, and the trigger TR2n and the TR3p of another phase are always output in synchronization, thereby ensuring appropriate power output. Furthermore, as can be seen from Figures 7 to 11, the output increases as the trigger angle increases, and it has been confirmed that the output reaches 100% when the trigger angle is 30° (150° in Figure 11).

[0022] The first trigger signal and the second trigger signal may be one continuous trigger signal. In this case, the length of the "one continuous trigger signal" must be less than 180°. 8 to 11, once the trigger angle falls below 120° (after exceeding 60° in the notation in the figures), the second trigger signals (TR3p, TR3n) are not necessary (because the corresponding thyristors remain in the on state). Therefore, once the trigger angle falls below 120°, the second trigger signals (TR3p, TR3n) may not be output.

[0023] (Three-phase three-arm control) The wiring for the three-phase three-arm control mode is the same as that for the three-phase six-arm control mode (Figure 2), with only the control processing being different. In the three-phase three-arm control mode, a trigger angle for three-phase three arms is calculated, and a trigger signal (third trigger signal) that steadily turns on one of the unidirectional thyristors 131A and 132A is output, and a trigger signal (fourth trigger signal) based on the phase information and the trigger angle for three-phase three arms is output to the other of the unidirectional thyristors 131A and 132A. The "trigger angle for three-phase three-arm" is a phase angle in the range of 240° to 30°, and is 240° when the target load factor is 0% (i.e., output 0%) and 30° when the target load factor is 100% (i.e., output 100%).

[0024] FIG. 3 is a conceptual diagram of wiring when the power regulator 1 is used for single-phase control. When power regulator 1 is used for single-phase control, main circuit connection terminals 161A, 162A, main circuit connection terminals 161B, 162B, and main circuit connection terminals 161C, 162C are connected to power supply lines 5A-5C for loads (heaters) 2A-2C, respectively. Furthermore, power supply lines 5A-5C are connected to input power terminals 15A-15C, respectively. In addition, in Figure 3, for convenience of illustration, it is shown as if there are three power regulators 1, but this does not indicate that there are three power regulators 1, and only one power regulator 1 is used. As a result, each AC current control circuit 13A-13C is connected to each power supply line 5A-5C, enabling switching of each power supply line 5A-5C, and the power supply waveform acquisition unit 12 is also connected to each power supply line 5A-5C, enabling acquisition of the power supply waveform of each phase.

[0025] (single-phase control) In the single-phase control mode, a single-phase trigger angle is calculated, and a trigger signal (fifth trigger signal) based on the phase information and the single-phase trigger angle is output to the unidirectional thyristors 131A, 132A that match the polarity of the phase information of the power waveform acquired by the power waveform acquisition unit 12. In this process, trigger angles corresponding to the target load factor (0-100%) input from the temperature controller are calculated between a trigger angle of 180° corresponding to a 0% target load factor and a trigger angle of 0° corresponding to a 100% target load factor. The thyristor (either 131A or 132A) that is turned on in accordance with the polarity of the power supply is triggered at the single-phase trigger angle. This results in an output that matches the target load factor. For example, as shown in FIG. 12, for 50% output, thyristors 131A and 132A are triggered to turn on every 90° trigger angle (1 / 4 cycle). The operation of the single-phase control mode itself is conceptually similar to that of a conventional single-phase AC power regulator, and therefore will not be described further here.

[0026] FIG. 4 is a conceptual diagram of wiring when the power regulator 1 is used for three-phase four-wire control. When power regulator 1 is used for three-phase four-wire control, main circuit connection terminals 161A, 161B, and 161C are connected to power supply lines 4A-4C of each phase from three-phase AC power supply 3 to three-phase load 2 (each load (heater) 2A-2C), and common line (Neutra) 4D is connected to main circuit connection terminals 162A, 162B, and 162C. Furthermore, power supply lines 4A-4C are connected to input power terminals 15A-15C, and common line (Neutra) 4D is connected to input power terminal 15D. As a result, each AC current control circuit 13A-13C is connected between each power supply line 4A-4C and the common line (Neutra) 4D, enabling switching of each power supply line 5A-5C, and the power supply waveform acquisition unit 12 is also connected between each power supply line 4A-4C and the common line (Neutra) 4D, enabling acquisition of the power supply waveform of each phase.

[0027] (Three-phase, four-wire control) Control in the three-phase four-wire control mode is the same as single-phase control (control in the single-phase control can be applied as is).

[0028] FIG. 5 is a flowchart showing an outline of the processing operation of the power regulator 1 related to the present invention. In step 501, it is determined whether the mode is a single-phase control mode (or a three-phase four-wire control mode), a three-phase six-arm control mode, or a three-phase three-arm control mode. The mode is set by the user via an input unit provided in the device, for example. If the result of the determination in step 501 is that the mode is the single-phase control mode (or the three-phase four-wire control mode), the process proceeds to step 502, where, as described above, the single-phase trigger angle (180° to 0°) is calculated from the target load factor (0 to 100%), and the thyristor (either 131A or 132A) that is in the direction to conduct electricity according to the polarity of the power supply is triggered at the single-phase trigger angle (a fifth trigger signal is output). If an instruction to stop the power supply is given, the process ends (step 503: Yes→End), and if not, the process of step 502 continues (step 503: No→step 502).

[0029] If the determination in step 501 indicates that the mode is the three-phase six-arm control mode, the process proceeds to step 504, where the three-phase six-arm trigger angle is calculated as described above, and the thyristor (either 131A or 132A) that is in the direction of conduction according to the polarity of the power supply is triggered at the three-phase six-arm trigger angle (a first trigger signal is output). Also, the same thyristor is triggered at a phase angle that is 60° behind the three-phase six-arm trigger angle (a second trigger signal is output). If an instruction to stop the power supply is given, the process ends (step 505: Yes→End), and if not, the process of step 504 continues (step 505: No→step 504).

[0030] If the determination in step 501 indicates that the mode is the three-phase three-arm control mode, the process proceeds to step 506, where the trigger angle for three-phase three-arm is calculated as described above, a trigger signal for steadily turning on one of the unidirectional thyristors 131A, 132A is output (a third trigger signal is output), and the other of the unidirectional thyristors 131A, 132A is triggered at the trigger angle for three-phase three-arm (a fourth trigger signal is output). If an instruction to stop the power supply is given, the process ends (step 507: Yes→End), and if not, the process of step 506 continues (step 507: No→step 506).

[0031] As described above, the power regulator 1 of this embodiment is a three-phase six-arm power regulator that controls the power supply from a three-phase AC power source to a load by phase control, and can be used for both single-phase (and three-phase four-wire) and three-phase three-arm applications. One three-phase power regulator can perform the functions of three single-phase power regulators, which is expected to reduce costs compared to power regulation using three single-phase power regulators. Three separate units would require three display units and three calculation units, but with one three-phase power regulator, these can be shared, which is expected to reduce costs. Furthermore, since one type of power regulator can be used as both a single-phase and three-phase power regulator, power regulator suppliers can reduce their product development burden by narrowing down their product development to one type. Another benefit is that production lines can be unified. Furthermore, users can expect the benefit of reduced maintenance costs because they only need to prepare one type of power regulator for maintenance. In this embodiment, the power regulator for three-phase six-arms is capable of supporting both single-phase (and three-phase four-wire) and three-phase three-arm applications, but it may also be capable of supporting only one of single-phase, three-phase four-wire, or three-phase three-arm applications, or any combination of these.

[0032] In this embodiment, an example is shown in which the three-phase AC power supply is Y (star) connected and the load is Delta connected (the load is also Y (star) connected in FIG. 4), but the present invention can be applied to either the power supply side or the load side, regardless of whether it is Y (star) connected or Delta connected.

[0033] In expressing the trigger angle, the starting 0V point of a half cycle starting and ending at the 0V point of the line voltage of the AC power supply is taken as the origin (0°), and the latter 0V point is taken as 180°, but other expressions may be used. For example, as used in Figures 7 to 11, the zero-cross points on the rear side of the waveform of the positive half cycle and the negative half cycle of the line voltage may be taken as the reference (0°), and the trigger angle may increase going backward from there (in this case, for example, the trigger angle for a three-phase six-arm system would be in the range of 0° to 150°), and such differences in expression do not result in a difference in the concept of the present invention.

[0034] In the embodiment, the power regulator is exemplified as a power regulator in which the load is a heater and the power supply to the heater is controlled based on a target load rate input from a temperature regulator, which is an external device. However, the present invention is not limited to this and can be applied to a power regulator that supplies power to any load.

[0035] Simulations have confirmed that the three-phase six-arm trigger angle can be controlled correctly by directly and proportionally converting the single-phase trigger angle (180° to 0°) into a trigger angle range of 180° to 30°. That is, for example, the three-phase six-arm trigger angle can be calculated by multiplying the single-phase trigger angle by 150 / 180 = 5 / 6 and adding 30°. In other words, one trigger angle can be calculated from the other. Similarly, correct control can be performed for the three-phase three-arm trigger angle by directly and proportionally converting the single-phase trigger angle (180° to 0°) into a trigger angle range of 240° to 30°. That is, for example, the three-phase three-arm trigger angle can be calculated by multiplying the single-phase trigger angle by 210 / 180 = 7 / 6 and adding 30°. That is, one trigger angle can be calculated from the other trigger angle. Therefore, for example, by calculating a "single-phase trigger angle" using any method for calculating a trigger angle in a conventional single-phase power regulator and proportionally converting this to a trigger angle range of 180° to 30°, a "three-phase six-arm trigger angle" can be obtained, and by proportionally converting the "single-phase trigger angle" to a trigger angle range of 240° to 30°, a "three-phase three-arm trigger angle" can be obtained. The reverse of these is also possible (for example, a single-phase trigger angle can be obtained by converting a three-phase six-arm trigger angle calculated using any method for calculating a trigger angle in a conventional three-phase six-arm power regulator). That is, the trigger angle for single-phase (and three-phase four-wire), the trigger angle for three-phase six-arm, and the trigger angle for three-phase three-arm can be converted into each other, and the trigger angle for another control mode can be calculated from either the trigger angle for single-phase (and three-phase four-wire), the trigger angle for three-phase six-arm, or the trigger angle for three-phase three-arm.

[0036] In this embodiment, the power supply waveform acquiring unit 12 is connected to the power supply lines of each phase, and the phase information of the power supply waveform of each phase can be acquired, but the present invention is not limited to this. For example, the phase information of the power supply waveform of only one phase of a three-phase AC power supply may be acquired, and then the phase information of the power supply waveform of each phase may be acquired (calculated) by shifting the phase by 120° from that. [Explanation of symbols]

[0037] 1...Power regulator 11...Control unit (trigger angle calculation unit, trigger control unit) 12...Power supply waveform acquisition section (power supply phase acquisition section) 13A-C...AC current control circuit 131A, 132A, 131B, 132B, 131C, 132C...Current control elements 2. Load 3...Three-phase AC power supply

Claims

1. A power regulator that controls power supply from a three-phase AC power source to a load by phase control, a power supply phase acquisition unit that acquires phase information of a line voltage of the three-phase AC power supply; an AC current control circuit in which unidirectional current control elements corresponding to each phase are connected in anti-parallel; a trigger angle calculation unit that calculates a trigger angle corresponding to a target load factor, the trigger angle calculation unit calculating a three-phase six-arm trigger angle for the unidirectional current control element in a three-phase six-arm control mode, and a single-phase trigger angle for the unidirectional current control element in a single-phase control mode or a three-phase four-wire control mode; a trigger control unit that outputs a trigger signal to the unidirectional current control element; Equipped with In the three-phase six-arm control mode, a trigger signal based on the phase information and the three-phase six-arm trigger angle is output to the unidirectional current control element that matches the polarity of the phase information; a power regulator that outputs a trigger signal based on the phase information and the single-phase trigger angle to the unidirectional current control element that matches the polarity of the phase information in the single-phase control mode or the three-phase four-wire control mode.

2. A power regulator that controls power supply from a three-phase AC power source to a load by phase control, a power supply phase acquisition unit that acquires phase information of a line voltage of the three-phase AC power supply; an AC current control circuit in which unidirectional current control elements corresponding to each phase are connected in anti-parallel; a trigger angle calculation unit that calculates a trigger angle corresponding to a target load factor, the trigger angle calculation unit calculating a three-phase six-arm trigger angle for the unidirectional current control element in a three-phase six-arm control mode and a three-phase three-arm trigger angle for the unidirectional current control element in a three-phase three-arm control mode; a trigger control unit that outputs a trigger signal to the unidirectional current control element; Equipped with In the three-phase six-arm control mode, a trigger signal based on the phase information and the three-phase six-arm trigger angle is output to the unidirectional current control element that matches the polarity of the phase information; a power regulator that, in the three-phase three-arm control mode, outputs a trigger signal that steadily turns on the unidirectional current control element of one polarity, and outputs a trigger signal based on the phase information and the three-phase three-arm trigger angle to the unidirectional current control element of the other polarity.

3. A power regulator that controls power supply from a three-phase AC power source to a load by phase control, a power supply phase acquisition unit that acquires phase information of a line voltage of the three-phase AC power supply; an AC current control circuit in which unidirectional current control elements corresponding to each phase are connected in anti-parallel; a trigger angle calculation unit that calculates a trigger angle corresponding to a target load factor, the trigger angle calculation unit calculating a three-phase six-arm trigger angle for the unidirectional current control element in a three-phase six-arm control mode, a single-phase trigger angle for the unidirectional current control element in a single-phase control mode or a three-phase four-wire control mode, and a three-phase three-arm trigger angle for the unidirectional current control element in a three-phase three-arm control mode; a trigger control unit that outputs a trigger signal to the unidirectional current control element; Equipped with In the three-phase six-arm control mode, a trigger signal based on the phase information and the three-phase six-arm trigger angle is output to the unidirectional current control element that matches the polarity of the phase information; In the single-phase control mode or the three-phase four-wire control mode, a trigger signal based on the phase information and the single-phase trigger angle is output to the unidirectional current control element that matches the polarity of the phase information; a power regulator that, in the three-phase three-arm control mode, outputs a trigger signal to steadily turn on the unidirectional current control elements of one polarity, and outputs a trigger signal based on the phase information and the three-phase three-arm trigger angle to the unidirectional current control elements of the other polarity.

4. A program executed in a power regulator including a power supply phase acquisition unit that acquires phase information of a line voltage of a three-phase AC power supply, and an AC current control circuit in which unidirectional current control elements corresponding to each phase are connected in anti-parallel, a step of calculating a three-phase six-arm trigger angle for the unidirectional current control element in a three-phase six-arm control mode, and outputting a trigger signal based on the phase information and the three-phase six-arm trigger angle to the unidirectional current control element that matches the polarity of the phase information; In a single-phase control mode or a three-phase four-wire control mode, calculating a single-phase trigger angle for the unidirectional current control element, and outputting a trigger signal based on the phase information and the single-phase trigger angle to the unidirectional current control element that matches the polarity of the phase information; a step of calculating, in a three-phase three-arm control mode, a three-phase three-arm trigger angle for the unidirectional current control element, outputting a trigger signal for steadily turning on the unidirectional current control element of one polarity, and outputting a trigger signal based on the phase information and the three-phase three-arm trigger angle for the unidirectional current control element of the other polarity; A power regulation control program having the above steps.

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