JP4719847B2 - Power regeneration method and power regeneration device - Google Patents

Description

  The present invention relates to a power regeneration method and a power regeneration device. More specifically, the present invention relates to a power regeneration method and a power regeneration device that can improve regeneration efficiency.

  In general, regenerative braking is performed as a braking method when an electric motor including an induction motor is driven by a so-called inverter. Regenerative braking is a method of obtaining braking force while lowering the output frequency of the inverter and operating the motor as a generator, and is one of the most efficient braking methods.

  FIG. 7 shows an example of a converter device that constitutes a part of such an inverter. This converter device 100 has a single-phase bridge circuit 101 using diodes D11, D12, D13, and D14 and a smoothing capacitor 102, and converts the single-phase alternating current from the power source E ′ into direct current by the bridge circuit 101. The smoothing capacitor 102 repeatedly charges and discharges to output a DC voltage Vdc ′.

  Further, converter device 100 consumes regenerative energy as heat energy in order to prevent voltage Vdc ′ from being increased by regenerative power and destroying circuit elements when the load is in a regenerative state. A unit 103 is provided.

  The regenerative power consumption unit 103 monitors the regenerative resistor 104 connected in parallel with the smoothing capacitor 102 and consumes the regenerative power, the transistor 105 connected in series with the regenerative resistor 104, and the output voltage Vdc ′. When the voltage rises beyond a certain value, the transistor 105 is turned on, the regenerative resistor 104 is turned on, and the regenerative control circuit 106 controls the regenerative energy to be consumed as heat energy.

  In such a conventional converter device 100, since all the regenerative power is consumed as heat energy by the regenerative resistor 104, there is a problem that the energy cannot be effectively used.

  Further, since all the generated regenerative power is consumed as thermal energy, there is another problem that it is necessary to use a relatively large resistance and it is difficult to reduce the size of the apparatus.

  For this reason, it is conceivable to perform power regeneration using a so-called PWM converter 110 as shown in FIG. However, in the conventional PWM converter, all the regenerative energy including the inrush current flows into the power feedback transistors Q11, Q12, Q13, Q14 connected in antiparallel with the rectifying elements D11 to D14. In addition, it is necessary to use a large-capacity sensor or to provide a current sensor to limit the current, which causes a problem that the system becomes complicated, resulting in an increase in cost and an increase in the size of the apparatus.

Japanese Patent Laid-Open No. 2000-156937 proposes a power regeneration device that does not require a discharge circuit.
JP 2000-156937 A

  The present invention has been made in view of the problems of the related art, and an object thereof is to provide a power regeneration method and a power regeneration device that can improve the regeneration efficiency.

  The power regeneration method and apparatus of the present invention generates a reference signal for generating a regeneration operation command from a power supply voltage, performs a predetermined process on the reference signal to generate a regeneration operation command, Select a set of transistors to be turned on based on polarity, generate a signal to turn on the selected set of transistors, and turn on / off the selected set of transistors by the control signal obtained by the logical product of both signals To regenerate power. Here, as the reference signal, for example, an absolute value signal of voltage, a normalized change rate signal of voltage, a voltage signal, or the like is used.

That is, the first form of the power regeneration method of the present invention is a power regeneration method for a single-phase converter having a regeneration transistor, the procedure for detecting the power supply voltage, the procedure for determining the polarity from the power supply voltage, and the polarity. A procedure for selecting a set of transistors to be conducted based on the steps, a procedure for generating a conduction enable command for the selected set of transistors, a procedure for generating a reference signal for generating a regenerative operation command from a power supply voltage, and A procedure for generating a regenerative operation command by performing a predetermined process on a reference signal, a procedure for generating a logical product of the conduction enable command and the regenerative operation command, and a transistor selected based on the logical product Generating a control signal for turning on / off the pair, and calculating a rate of change of the power supply voltage in the procedure of generating the reference signal, and obtaining the rate of change of the power supply voltage obtained. Generates a reference signal is normalized by dividing the peak value of the supply voltage, the predetermined process in the procedure for generating the regenerative operation command corresponds thresholding the longitudinal zero crossing of the normalized rate of change signal And a selection process for selecting a range in which the regenerative operation command value is turned on .

A second form of the power regeneration method of the present invention is a power regeneration method for a single-phase converter having a regeneration transistor, which is based on a procedure for detecting a power supply voltage, a procedure for determining the polarity from the power supply voltage, and the polarity. Selecting a set of transistors to be conducted, a procedure for generating a conduction enable command for the selected set of transistors, a procedure for generating a reference signal for generating a regenerative operation command from a power supply voltage, and the reference signal A procedure for generating a regenerative operation command by performing a predetermined process for the above, a procedure for generating a logical product of the conduction enable command and the regenerative operation command, and a set of transistors selected based on the logical product. Generating a control signal that turns on and off, and in the step of generating the reference signal, at the peak of the power supply voltage that is not affected by fluctuations in the power supply voltage Generating a corresponding voltage signal as a reference signal the pressure value, the predetermined process in the procedure for generating the regenerative operation command is turned on the regenerative operation command value before and after the peak of the supply voltage signal by regenerating thresholded It is characterized by the selection process for selecting the period to be.

  Furthermore, in the power regeneration method of the present invention, a signal for turning on the transistor set is generated for a period in which the ON period of the conduction enable command and the ON period of the regeneration operation command overlap.

  Furthermore, in the power regeneration method of the present invention, it is preferable that the predetermined range is changed according to load fluctuation.

  Furthermore, in the power regeneration method of the present invention, it is preferable that the predetermined period is changed according to load fluctuation.

A power regeneration device according to a first aspect of the present invention is a power regeneration device for a single-phase converter having a regeneration transistor, which includes a polarity determination unit that determines the polarity of a power supply, a power supply voltage detection unit that detects a power supply voltage, A transistor selection command generation unit that generates a command for selecting a set of transistors based on the polarity of the power source determined by the polarity determination unit, and the transistor selection command generation unit. A conduction possible period setting unit that sets a conduction possible period of a set of transistors selected based on a command from a power supply voltage, and a normalized change rate signal of a power supply voltage based on a power supply voltage detected by the power supply voltage detection unit. A power supply voltage normalized change rate signal generation unit to be generated and a regenerative operation by performing predetermined processing on the normalized change rate signal generated by the power supply voltage normalized change rate signal generation unit ON of a set of transistors selected by calculating a logical product of a regenerative operation command generation unit that generates a command, a conduction enable command from the conduction possible period setting unit, and a regenerative operation command from the regenerative operation command generation unit A control signal generation unit that generates a control signal for controlling off, and the power supply voltage normalization change rate signal generation unit calculates a change rate of the power supply voltage and waves the obtained change rate of the power supply voltage. A reference signal is generated by normalizing by dividing by a high value, and the predetermined operation in the regenerative operation command generation unit is to perform a regenerative operation command value by performing a corresponding threshold value process before and after zero crossing of the normalized change rate signal. The selection process is to select a range to be turned on .

A second form of the power regeneration device of the present invention is a power regeneration device of a single-phase converter having a regeneration transistor, in which a polarity determination unit that determines the polarity of a power source, a power supply voltage detection unit that detects a power supply voltage, A regeneration control unit, wherein the power regeneration control unit generates a command for selecting a set of transistors based on the polarity of the power source determined by the polarity determination unit, and the transistor selection command generation unit A conduction possible period setting unit for setting a conduction possible period of a set of transistors selected based on the command of the above, and an equivalent voltage signal of the power supply voltage based on the power supply voltage detected by the power supply voltage detection unit A voltage signal generation unit; and a regenerative operation command generation unit that generates a regenerative operation command by performing predetermined processing on the equivalent voltage signal generated by the equivalent voltage signal generation unit. Control for generating a control signal for controlling on / off of a selected transistor set by calculating the logical product of the conduction enable command from the conduction possible period setting unit and the regeneration operation command from the regeneration operation command generation unit The equivalent voltage signal generation unit generates a voltage value at the peak of the power supply voltage that is not affected by fluctuations in the power supply voltage as an equivalent voltage signal serving as a reference signal, and generates the regenerative operation command. The predetermined process in the unit is a selection process for selecting a period during which the regeneration operation command value is turned on by performing a regeneration threshold process before and after the peak time of the power supply voltage signal.

  In the power regeneration device of the present invention, a signal for turning on the transistor set is generated for a period in which the ON period of the conduction enable command and the ON period of the regeneration operation command overlap. It is said.

  Furthermore, in the power regeneration device of the present invention, it is preferable that a regenerative power consuming unit is arranged in series on one of the DC buses of the single-phase converter.

  According to the present invention, it is possible to obtain an excellent effect that the efficiency of power regeneration is improved while simplifying the control.

  Hereinafter, although the present invention is explained based on an embodiment, referring to an accompanying drawing, the present invention is not limited only to this embodiment.

Embodiment 1
FIG. 1 shows a converter device using the power regeneration method according to Embodiment 1 of the present invention. In the first embodiment, power regeneration is performed by performing threshold processing on the absolute value signal of the power supply voltage.

  The converter device K supplies direct current to an inverter device (inverted device in a narrow sense, that is, an inverse conversion device) that performs speed control of an AC motor (not shown). As shown in FIG. 1, the input terminals I1 and I2 have a single input terminal. The AC motor is connected to a phase AC power source E and rectifies the input AC from the power source E when the AC motor is powered, and outputs it from the DC buses P and N via the output terminals O1 and O2. It is configured as a power regenerative converter to be fed back to

  Specifically, the converter device K includes a rectifying unit 1 that rectifies input alternating current, a smoothing unit 2 that smoothes output direct current, a regenerative power consuming unit 3 that consumes regenerative power during power regeneration, and an AC power supply. Based on the outputs of the polarity discriminating unit 4 for discriminating the polarity of E, the power source voltage detecting unit 5 for detecting the power source voltage Ve, and the polarity discriminating unit 4 and the power source voltage detecting unit 5, the power regeneration in the rectifying unit 1 is controlled. It is assumed that the power regeneration control unit 6 is provided as a main component.

  Here, the power regeneration control unit 6 includes a transistor selection command generation unit 11 that selects a transistor Q to be conducted, a conduction possible period setting unit 12 that sets a conduction possible period of the selected transistor Q, and a power source as a reference signal. A power supply voltage absolute value signal generation unit 13 that generates an absolute value signal of the voltage Ve, a regenerative operation command generation unit 14, and a control signal generation unit 15 are included. In addition, the electric power regeneration control part 6 which has such each part is implement | achieved by storing the program matched with each function mentioned later, for example in a microcomputer.

  The rectifying unit 1 connects regenerative power feedback transistors Q1, Q2, Q3, and Q4 in antiparallel to each of four rectifying elements (diodes) D1, D2, D3, and D4 that constitute a single-phase bridge circuit. It is supposed to be.

  The smoothing unit 2 is configured by connecting one terminal of a capacitor 21 having a predetermined capacity to one of the DC buses P and N, and connecting the other terminal of the capacitor 21 to the other bus N, and the output voltage Vdc. If the voltage is higher than the reference voltage, the battery is charged, and if the voltage is lower than the reference voltage, the battery is discharged. The charge / discharge is repeated to smooth the output voltage Vdc.

  The regenerative power consuming unit 3 is in a conductive state during power running between the connection portion 21a of the capacitor 21 connected to the positive DC bus P and the connection portion 1a of the rectifying unit 1 to the DC bus P, and is turned off during power regeneration. The diode D5 is disposed so as to function as a switch, and a resistor 22 that consumes regenerative power during power regeneration is connected in parallel with the diode D5.

  The polarity discriminating unit 4 discriminates the polarity of the power supply voltage Ve that changes as shown in FIG. 2A, and sends a signal indicating the discrimination result to the transistor selection command generating unit 11 of the power regeneration control unit 6 and the absolute value of the power source voltage. The result is output to the calculation unit 13.

  According to the polarity of the power supply voltage Ve, the transistor selection command generation unit 11 causes the positive charge charged in the capacitor 21 to flow on the positive side of the power source E and the capacitor 21 to be charged on the negative side of the power source E during power regeneration. A signal for selecting a set to be conducted is generated from each set of the transistors Q1 to Q4 (each set of the transistors Q1 and Q4 and the transistors Q2 and Q3) so that a negative charge flows, and is output to the conduction possible period setting unit 12 . For example, in the example shown in FIG. 1, if the power supply voltage Ve is positive, the pair of transistors Q1 and Q4 is selected, while if the power supply voltage Ve is negative, the pair of transistors Q2 and Q3 is selected.

  The conduction possible period setting unit 12 sets a conduction possible period of a set of transistors selected according to the polarity determined by the polarity determination unit 4. For example, a period in which the power supply voltage Ve is positive is set as a conduction enabling period for the pair of transistors Q1 and Q4, while a period in which the power supply voltage Ve is negative is set as a conduction enabling period for the pair of transistors Q2 and Q3 (FIG. 2 ( c) and (d)). The set conduction possible period is output to the control signal generation unit 15 as a conduction possible period command 31.

  In addition, the transistor selection command generation unit 11 and the conduction possible period setting unit 12 may be integrated into the transistor selection command generation unit 11.

  The power supply voltage absolute value signal generation unit 13 generates a signal representing the absolute value Vea of the power supply voltage Ve as shown in FIG. 2B based on the inputs from the polarity determination unit 4 and the power supply voltage detection unit 5. .

  The regenerative operation command generation unit 14 performs threshold processing on the power supply voltage absolute value Vea signal calculated by the power supply voltage absolute value signal generation unit 13 using the regenerative threshold Vr, and the power supply voltage absolute value Vea becomes the regenerative threshold Vr. When it becomes higher than this, a regenerative operation command 32 as shown in FIG.

  The regeneration threshold value Vr can be set to an arbitrary value according to the load fluctuation. Here, the load fluctuation is usually obtained from the output voltage Vdc, but in the first embodiment, the output voltage Vdc is not measured, and is obtained by the following procedures 1 to 3. As a result, the measurement mechanism for the output voltage Vdc can be omitted, and the device can be further reduced in size and cost.

  Procedure 1: The rate of increase in DC voltage Vdc due to regenerative power during regeneration is measured or calculated in advance.

  Procedure 2: In consideration of the rate of increase measured or calculated in Procedure 1, the conditions under which the regenerative operation operates are calculated so that the output voltage Vdc does not exceed the circuit rating. Specifically, such a condition is calculated based on an experiment or the like according to a load condition such as a motor operation pattern.

  Procedure 3: The regeneration threshold value Vr is set according to the conditions calculated in the procedure 2.

  Further, the regenerative operation command 32 generated by the regenerative operation command generation unit 14 includes the control signal generation unit 15 together with the conduction possible period command 31 from the conduction possible period setting unit 12 (see FIGS. 2C and 2D). Is input.

  The control signal generation unit 15 calculates the logical product of the conduction possible period command 31 and the regenerative operation command 32, that is, extracts a portion where the ON signals of both commands overlap each other, as shown in FIGS. 2 (f) and 2 (g). Thus, the control signal 33 that actually turns on the pair of the transistors Q1 and Q4 and the pair of the transistors Q2 and Q3 is generated in each conduction possible period.

  These control signals 33 are supplied to the pair of transistors Q1 and Q4 and the pair of transistors Q2 and Q3, and the pair of transistors Q1 and Q4 and the pair of transistors Q2 and Q3 are turned on for a predetermined period. Made.

  Due to this power regeneration, a regenerative current flows into the transistors Q1, Q2, Q3, and Q4. Since this regenerative current is fed back to the power source via the resistor 22 of the regenerative power consuming unit 3, the regenerative current in the transistors Q1, Q2, Q3, and Q4 Inrush of regenerative current is suppressed. Therefore, the capacity of the transistors Q1, Q2, Q3, and Q4 can be reduced, and the transistors Q1, Q2, Q3, and Q4 can be downsized. The resistor 22 also suppresses a steep change in the DC circuit voltage.

  However, since the regenerative current returns to the power supply side via the resistor 22, at this time, a part of the regenerative energy is released as heat energy. However, since the potential difference between both terminals of the resistor 22 is very small compared to the voltage between the terminals, that is, the output voltage Vdc, the regenerative energy consumed by the resistor 22 can be reduced by making the resistor 22 low resistance. The regenerative energy consumed by the resistor 104 shown in FIG. That is, the size of the resistor 22 can be reduced, and the loss of regenerative energy can be greatly reduced.

  Next, power regeneration by the converter device K having such a configuration will be described.

  Step 11: Determine the polarity of the power source E.

  Procedure 12: The absolute value Vea of the power supply voltage Ve is calculated.

  Procedure 13: A pair of transistors Q and Q to be conducted is selected according to the determined polarity of the power supply E.

  Step 14: The conduction possible period command 31 for the selected pair of transistors Q and Q (that is, the pair of Q1 and Q4 and the pair of Q2 and Q3) is generated (see FIGS. 2C and 2D).

  Procedure 15: It is determined whether or not the power supply voltage absolute value Vea exceeds the regenerative threshold value Vr. If it exceeds, the process proceeds to Procedure 16, while if not, this procedure is repeated.

  Procedure 16: A regenerative operation command 32 is generated. That is, the period exceeding the threshold is set as the ON period of the regenerative operation command (see FIG. 2 (e)).

  Procedure 17: The logical product of the conduction possible period command 31 and the regenerative operation command 32 is calculated. That is, a period in which the ON period of the conduction possible period command 31 and the ON period of the regenerative operation command 32 overlap is detected.

Procedure 18: A control signal 33 is generated based on the calculation result. That is, a signal for turning on the pair of the transistors Q and Q is generated for a period in which the conduction possible period and the on period of the regenerative operation command overlap. (See Fig. 2 (f) and (g))
Procedure 19: The corresponding transistor Q, Q is turned on by the control signal 33 and power regeneration is executed for a predetermined period.

  As described above, according to the first embodiment, it is possible to improve the regeneration efficiency in the power regeneration while simplifying the configuration of the detection unit. Further, since the transistor Q and the resistor 22 can be reduced in size, the device can be reduced in size and cost.

Embodiment 2
The second embodiment of the present invention is a modification of the first embodiment, and generates a regenerative operation command based on the rate of change dVe of the power supply voltage Ve (see FIG. 6). That is, the normalized change rate signal is used as the reference signal, and power regeneration is performed by performing selection processing on the signal.

  As shown in FIG. 3, in the converter device K1 of the second embodiment, the power regeneration control unit 6A includes a power supply voltage change rate signal generation unit 41 instead of the power supply voltage absolute value signal generation unit 13 of the first embodiment. It is supposed to be. Here, the polarity determination unit 4A of the converter device K1 outputs a signal representing the determination result only to the transistor selection command generation unit 11.

  The power supply voltage change rate signal generation unit 41 calculates the change rate dVe of the power supply voltage Ve detected by the power supply voltage detection unit 5, and divides the calculated power supply voltage change rate dVe by the peak value Vem of the power supply voltage Ve. The normalized value (hereinafter referred to as normalized change rate) is output to the regenerative operation command generation unit 14A.

  The regenerative operation command generation unit 14A generates a regenerative operation command 32A by performing a predetermined selection process on the input normalized change rate, and outputs the regenerative operation command 32A to the control signal generation unit 15A.

  Hereinafter, the operation of the regenerative operation command generation unit 14A will be described in more detail.

  As shown in FIG. 5, when the peak value Vem drops from the original value V1 to, for example, a predetermined value V2 lower than the regeneration threshold value Vr due to fluctuations in the power supply voltage Ve, the power supply voltage Ve is regenerated. As a result, the regenerative operation command is not output in a desired period in the converter device K of the first embodiment. Conversely, when the peak value Vem rises higher than the original value V1 (not shown), the period for outputting the regenerative operation command is longer than the desired period. And the continuation of such a state leads to a system abnormality.

  Therefore, the regenerative operation command generation unit 14A has a normalized change rate of the power supply voltage Ve within a predetermined range so that the regenerative operation command is appropriately output regardless of fluctuations in the power supply voltage Ve (peak value Vem). Whether or not to turn on the regenerative operation command 32A is determined according to whether or not it is.

  That is, as shown in FIG. 6, the power supply voltage Ve is expressed by the following equation 1 using the peak value Vem.

Ve = Vem · sinθ (1)
At this time, the rate of change dVe is expressed by the following equation 2.

dVe = Vem · cosθ (2)
Here, cosθ (normalized change rate: a value obtained by dividing the dVe value by the Vem value) in the above-described formula 2 is not affected by fluctuations in the power supply voltage Ve (crest value Vem). ) Is within a predetermined range before and after the zero crossing (see FIG. 6), it is possible to perform control so that the regenerative operation can be performed appropriately regardless of fluctuations in the power supply voltage Ve.

  However, α is a number of 0 <α <1, and is a determination value for a normalized change rate (that is, cos θ) set in the same manner as the regeneration threshold value Vr of the first embodiment, that is, an equivalent regeneration threshold value. It is.

  As described above, in the second embodiment, an effect that cannot be obtained in the first embodiment in which proper power regeneration is performed regardless of fluctuations in the power supply voltage can be obtained.

Embodiment 3
The third embodiment of the present invention is a modification of the first embodiment, and generates a regenerative operation command based on the peak time of the power supply voltage Ve. In other words, the equivalent voltage signal is used as the reference signal, and the power is regenerated by performing selection processing on the corresponding voltage signal.

  As shown in FIG. 4, in the converter device K2 of the third embodiment, the power regeneration control unit 6B includes an equivalent voltage signal generation unit 42 instead of the power supply voltage absolute value signal generation unit 13 of the first embodiment. Is done. Here, the polarity determination unit 4B of the converter device K2 outputs a signal representing the determination result only to the transistor selection command generation unit 11.

  The equivalent voltage signal generator 42 generates an equivalent voltage signal of the power supply voltage Ve detected by the power supply voltage detector 5 and outputs the generated equivalent voltage signal to the regenerative operation command generator 14B.

  The regenerative operation command generation unit 14B detects the peak time θmax of the input equivalent voltage signal, generates a regenerative operation command 32B for a predetermined period 2Δθ before and after that, and outputs the regenerative operation command 32B to the control signal generation unit 15B.

  For example, as shown in FIG. 6, if the power supply voltage Ve, that is, the peak time θmax of the equivalent voltage is 90 degrees, the regenerative operation command generator 14B turns on the regenerative operation command 32B for a predetermined period 2Δθ before and after that. It is supposed to be.

  In this case, since the power supply voltage Ve, that is, the peak time θmax of the equivalent voltage is not affected by the fluctuation of the power supply voltage Ve (peak value Vem), the power supply voltage Ve is selected by selecting a predetermined period 2Δθ before and after the peak time θmax. It is possible to perform control so that the regenerative operation can be appropriately performed regardless of the fluctuations in.

  However, Δθ is in the range of 0 <Δθ <90 °, and is a determination value for the peak time θmax of the equivalent voltage set in the same manner as the regeneration threshold value Vr of the first embodiment, that is, the equivalent regeneration threshold value. .

  As described above, in the third embodiment, an effect that cannot be obtained in the first embodiment in which proper power regeneration is performed regardless of fluctuations in the power supply voltage can be obtained.

  The present invention is applied to a converter device in which power regeneration is performed, and the efficiency is improved and the size is reduced.

It is a circuit diagram which shows the structure of the converter apparatus used for the electric power regeneration method which concerns on Embodiment 1 of this invention. It is a timing chart which shows the control contents at the time of electric power regeneration by the electric power regeneration control part of the device. It is a circuit diagram which shows the structure of the converter apparatus used for the electric power regeneration method which concerns on Embodiment 2 of this invention. It is a circuit diagram which shows the structure of the converter apparatus used for the electric power regeneration method which concerns on Embodiment 3 of this invention. It is a graph which shows the influence which it has on the regeneration operation | movement of a power supply voltage fluctuation | variation. It is a graph which shows the principle of the regeneration operation | movement of Embodiment 2 and Embodiment 3. FIG. It is a circuit diagram which shows the structure of the conventional converter apparatus. It is a circuit diagram which shows the structure of the conventional PWM converter apparatus.

Explanation of symbols

K converter device D diode Q transistor E AC power supply 1 rectifying unit 2 smoothing unit 3 regenerative power consuming unit 4 polarity discriminating unit 5 power supply voltage detecting unit 6 power regeneration control unit 11 transistor selection command generating unit 12 conduction possible period setting unit 13 power supply voltage Absolute value signal generator 14 Regenerative operation command generator 15 Control signal generator 41 Power supply voltage change rate signal generator 42 Equivalent voltage signal generator

Claims (9)

A power regeneration method for a single-phase converter having a regeneration transistor,
A procedure for detecting the power supply voltage;
The procedure for determining the polarity from the power supply voltage,
Selecting a set of transistors to conduct based on the polarity;
Generating a conduction enable command for a selected set of transistors;
A procedure for generating a reference signal for generating a regenerative operation command from a power supply voltage;
A procedure for generating a regenerative operation command by performing predetermined processing on the reference signal;
A procedure for generating a logical product of the continuity enable command and the regenerative operation command;
Generating a control signal for turning on and off a set of transistors selected based on the AND,
In the procedure for generating the reference signal, the rate of change of the power supply voltage is calculated, the obtained rate of change of the power supply voltage is divided by the peak value of the power supply voltage, and the reference signal is generated by normalization.
The predetermined process in the procedure for generating the regenerative operation command is a selection process for selecting a range in which the regenerative operation command value is turned on by performing a corresponding threshold process before and after the zero crossing of the normalized change rate signal. A power regeneration method characterized by that. A power regeneration method for a single-phase converter having a regeneration transistor,
A procedure for detecting the power supply voltage;
The procedure for determining the polarity from the power supply voltage,
Selecting a set of transistors to conduct based on the polarity;
Generating a conduction enable command for a selected set of transistors;
A procedure for generating a reference signal for generating a regenerative operation command from a power supply voltage;
A procedure for generating a regenerative operation command by performing predetermined processing on the reference signal;
A procedure for generating a logical product of the continuity enable command and the regenerative operation command;
Generating a control signal for turning on and off a set of transistors selected based on the AND,
In the procedure of generating the reference signal, the voltage value at the peak of the power supply voltage that is not affected by the fluctuation of the power supply voltage is generated as an equivalent voltage signal that becomes the reference signal,
The predetermined process in the procedure for generating the regenerative operation command is a selection process for selecting a period during which the regenerative operation command value is turned on by performing a regenerative threshold process before and after the peak of the power supply voltage signal. Power regeneration method. 3. The power regeneration method according to claim 1, wherein a signal for turning on the set of the transistors is generated for a period in which the ON period of the conduction enable command and the ON period of the regenerative operation command overlap. The power regeneration method according to claim 1, wherein the predetermined range is changed according to a load fluctuation. The power regeneration method according to claim 2, wherein the predetermined period is changed according to load fluctuation. A power regeneration device for a single-phase converter having a regeneration transistor,
A polarity determination unit for determining the polarity of the power supply, a power supply voltage detection unit for detecting a power supply voltage, and a power regeneration control unit,
The power regeneration control unit generates a command for selecting a set of transistors based on the polarity of the power source determined by the polarity determination unit, and is selected based on the command from the transistor selection command generation unit A conduction period setting unit that sets a conduction period of the set of transistors, and a power supply voltage normalization change that generates a power supply voltage normalized change rate signal based on the power supply voltage detected by the power supply voltage detection unit A rate signal generation unit, a regenerative operation command generation unit that generates a regenerative operation command by performing predetermined processing on the normalized change rate signal generated by the power supply voltage normalized change rate signal generation unit, and the continuity is possible Control that controls on / off of the selected transistor set by calculating the logical product of the conduction enable command from the period setting unit and the regenerative operation command from the regenerative operation command generation unit And a control signal generator for generating a No.,
The power supply voltage normalized change rate signal generation unit calculates a change rate of the power supply voltage, divides the obtained change rate of the power supply voltage by the peak value, generates a reference signal,
The predetermined process in the regenerative operation command generation unit is a selection process for selecting a range in which the regenerative operation command value is turned on by performing a corresponding threshold process before and after the zero crossing of the normalized change rate signal. A featured power regeneration device. A power regeneration device for a single-phase converter having a regeneration transistor,
A polarity determination unit for determining the polarity of the power supply, a power supply voltage detection unit for detecting a power supply voltage, and a power regeneration control unit,
The power regeneration control unit is selected based on a command from the transistor selection command generation unit, a transistor selection command generation unit that generates a command for selecting a transistor set based on the polarity of the power source determined by the polarity determination unit A conduction enable period setting unit that sets a conduction possible period of the set of transistors, an equivalent voltage signal generation unit that generates an equivalent voltage signal of a power supply voltage based on the power supply voltage detected by the power supply voltage detection unit, and A regenerative operation command generation unit that generates a regenerative operation command by performing predetermined processing on the equivalent voltage signal generated by the equivalent voltage signal generation unit, a conduction enable command from the conduction possible period setting unit, and a regenerative operation command A control signal generation unit that generates a control signal for controlling on / off of a selected transistor set by calculating a logical product with a regenerative operation command from the generation unit;
The equivalent voltage signal generation unit generates a voltage value at the peak of the power supply voltage that is not affected by fluctuations in the power supply voltage as an equivalent voltage signal serving as a reference signal,
The predetermined process in the regenerative operation command generation unit is a selection process for selecting a period during which the regenerative operation command value is turned on by performing a regenerative threshold process before and after the peak of the power supply voltage signal. Power regeneration device. 8. The signal for turning on the transistor set is generated for a period in which the ON period of the conduction enable command and the ON period of the regenerative operation command overlap. Power regeneration device. The power regeneration device according to claim 6 or 7, wherein a regenerative power consuming unit is arranged in series on one of the DC buses of the single-phase converter.

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