CN113302571B - Photovoltaic power generation driving system and control method thereof - Google Patents
Photovoltaic power generation driving system and control method thereof Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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Abstract
A photovoltaic power generation drive system (1) is provided with: an inverter circuit unit (4) that converts the DC voltage output by the solar cell panel (2) to an AC voltage in accordance with a pulse signal and outputs the AC voltage; a frequency limit value calculation unit (13) that calculates a limit value of an output frequency, which is the frequency of an alternating voltage, on the basis of a preset frequency-voltage characteristic of the alternating voltage and the value of a direct voltage output by the solar cell panel (2); and an output frequency calculation unit (15) that calculates a command value for the output frequency and outputs a pulse signal based on the command value or the limit value to the inverter circuit unit (4).
Description
Technical Field
The present invention relates to a photovoltaic power generation drive system that drives a load by using electric energy obtained by power generation of a solar cell panel, and a control method for the photovoltaic power generation drive system.
Background
In a photovoltaic power generation drive system that drives a motor as a load, in order to stably and continuously drive the motor, the rotational speed of the motor is adjusted so that the output power of the solar panel is equal to or higher than the maximum power point of the solar panel, thereby controlling the output power of the solar panel. The maximum power point changes according to environmental changes such as changes in the amount of sunlight or changes in the air temperature at the place where the solar panel is installed. If the solar output power becomes lower than the maximum power point, the motor develops an action fault. The solar output power is the output power of the solar panel.
Patent document 1 discloses that the margin up to the maximum power point of the solar output power is estimated based on the fluctuation of the output voltage of the solar panel when the rotation speed of the motor is repeatedly changed, and adjustment is performed so that the output voltage of the solar panel is higher than the voltage at the maximum power point. According to the technique of patent document 1, the photovoltaic power generation drive system can reduce the operation failure of the motor even when the solar output power continuously changes due to environmental changes by maintaining a state in which the output voltage of the solar panel is higher than the voltage at the maximum power point and the deviation between the output voltage and the voltage at the maximum power point falls within the allowable range.
Patent document 1: japanese patent No. 6105733
Disclosure of Invention
According to the technique of patent document 1, the photovoltaic power generation drive system is adjusted so that the output voltage of the solar cell panel is detected by repeatedly changing the rotation speed of the motor until the output voltage of the solar cell panel becomes higher than the voltage at the maximum power point and the deviation between the voltage at the maximum power point and the output voltage falls within an allowable range. Therefore, the photovoltaic power generation drive system has a problem that it takes time until the output voltage of the solar cell panel is maintained at an appropriate value.
Further, according to the technique of patent document 1, in order to detect a change in the maximum power point, the photovoltaic power generation drive system needs to repeatedly change the rotation speed of the motor at a predetermined timing (timing). Therefore, even when the solar output does not change and the adjustment for controlling the solar output is not necessary, the photovoltaic power generation drive system needs to adjust the rotational speed repeatedly at that timing, and therefore there is a problem that the motor cannot be driven stably.
The present invention has been made in view of the above circumstances, and an object thereof is to obtain a photovoltaic power generation drive system capable of reducing the time required for adjustment for controlling the output power of a solar cell panel and stably driving a load.
In order to solve the above problems and achieve the object, a photovoltaic power generation drive system according to the present invention is a photovoltaic power generation drive system that drives a load by using power output from a solar cell panel. The photovoltaic power generation drive system according to the present invention includes: an inverter circuit unit that converts the dc voltage output from the solar cell panel to an ac voltage in accordance with a pulse signal and outputs the ac voltage; a frequency limit value calculation unit that calculates a limit value of an output frequency, which is a frequency of an alternating voltage, based on a preset frequency-voltage characteristic of the alternating voltage and a value of a direct voltage output by the solar cell panel; and an output frequency calculation unit that calculates a command value of the output frequency and outputs a pulse signal based on the command value or the limit value to the inverter circuit unit.
ADVANTAGEOUS EFFECTS OF INVENTION
The photovoltaic power generation drive system according to the present invention has an effect of shortening the time required for adjustment for controlling the output power of the solar cell panel and enabling stable driving of the load.
Drawings
Fig. 1 is a diagram showing a schematic configuration of a photovoltaic power generation drive system according to embodiment 1 of the present invention.
Fig. 2 is a diagram showing a solar cell panel, a driving device, and a motor constituting the photovoltaic power generation driving system shown in fig. 1.
Fig. 3 is a diagram illustrating a relationship between a dc voltage output from the solar panel shown in fig. 2 and an output frequency of the inverter circuit unit.
Fig. 4 is a diagram showing an example of the relationship between the frequency limit value and the ac voltage calculated by the frequency limit value calculation unit included in the driving device shown in fig. 2.
Fig. 5 is a diagram showing another example of the relationship between the frequency limit value and the ac voltage calculated by the frequency limit value calculation unit included in the driving device shown in fig. 2.
Fig. 6 is a flowchart showing a flow of an operation performed by the control unit included in the driving device shown in fig. 2.
Fig. 7 is a diagram showing a hardware configuration in a case where the function of the control unit included in the drive device shown in fig. 2 is realized by using dedicated hardware.
Fig. 8 is a diagram showing a hardware configuration in a case where the function of the control unit included in the drive device shown in fig. 2 is realized by using a processor.
Detailed Description
Hereinafter, a photovoltaic power generation drive system and a control method of the photovoltaic power generation drive system according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.
Embodiment 1.
Fig. 1 is a diagram showing a schematic configuration of a photovoltaic power generation drive system 1 according to embodiment 1 of the present invention. Fig. 2 is a diagram showing the solar cell panel 2, the driving device 5, and the motor 6 constituting the photovoltaic power generation drive system 1 shown in fig. 1. The photovoltaic power generation drive system 1 drives a motor 6 as a load by using electric power output from the solar cell panel 2. The motor 6 is, for example, an induction motor. The photovoltaic power generation drive system 1 includes a drive device 5, and the drive device 5 converts a dc voltage supplied from the solar cell panel 2 into an ac voltage and outputs the ac voltage to the motor 6.
The drive device 5 includes: a capacitor 3 for storing the dc voltage supplied from the solar cell panel 2; and an inverter circuit unit 4 that converts the dc voltage stored in the capacitor 3 to an ac voltage and outputs the ac voltage. Further, the driving device 5 includes: a voltage detection unit 10 that detects the dc voltage stored in the capacitor 3; a current detection unit 11 that detects a current on the output side of the inverter circuit unit 4; and a control unit 20 that controls the drive device 5. Fig. 2 shows a functional configuration of the control unit 20.
The inverter circuit unit 4 converts the dc voltage supplied from the solar panel 2 into an ac voltage having a frequency corresponding to the motor 6 in accordance with the pulse signal output from the control unit 20. The inverter circuit unit 4 applies the converted ac voltage to the motor 6. Specifically, the inverter circuit unit 4 controls the Frequency and Voltage level of the ac Voltage by VVVF (Variable Voltage Variable Frequency) control.
The current detection unit 11 detects the phase currents of the U-phase, the V-phase, and the W-phase output from the inverter circuit unit 4. The phase current is collectively referred to as an output current. The control unit 20 calculates a command value of the output frequency based on the value of the dc voltage detected by the voltage detection unit 10 and the value of the output current detected by the current detection unit 11. The output frequency is the frequency of the ac voltage output by the inverter circuit unit 4. The control unit 20 outputs a pulse signal based on the calculated command value or a frequency limit value, which will be described later, to the inverter circuit unit 4. The Pulse signal is a Pulse Width Modulation (PWM) signal.
The control unit 20 performs feedback control on the inverter circuit unit 4. The control unit 20 includes an abnormal voltage drop determination unit 12, and the abnormal voltage drop determination unit 12 monitors the detection result of the dc voltage obtained by the voltage detection unit 10, and determines whether or not the drop is an abnormal voltage drop when the dc voltage drops. Further, the control unit 20 includes: a frequency limit value calculation unit 13 that calculates a frequency limit value that is a limit value of an output frequency; an acceleration/deceleration interruption determination unit 14 that determines interruption and resumption of rotation of the motor 6 with respect to acceleration or deceleration; and an output frequency calculation unit 15 that calculates a command value of the output frequency. Each functional unit included in the control unit 20 is realized by executing a control program, which is a program for executing the control method of the photovoltaic power generation drive system 1 according to embodiment 1, by using hardware.
The abnormal voltage drop determination unit 12 detects an abnormal voltage drop based on a change in the value of the dc voltage detected by the voltage detection unit 10. Specifically, the abnormal voltage drop determination unit 12 determines that there is an abnormal voltage drop when the decrease in the value of the dc voltage from the start of the voltage drop to a preset time is equal to or greater than the decrease in the threshold value. In addition, the abnormal voltage drop determination unit 12 determines that the dc voltage is normal when there is no decrease in the value of the dc voltage greater than or equal to the threshold value within the set time.
The abnormal voltage drop determination unit 12 outputs 1-bit information indicating whether or not there is an abnormal voltage drop. The signal when it is determined that there is an abnormal voltage drop is "1", and the signal when it is determined that it is normal is "0". The signal output by the abnormal voltage drop determination unit 12 is not limited to "0" and "1" as long as it is a signal that can identify whether or not there is an abnormal voltage drop.
The frequency limit value calculation unit 13 calculates the frequency limit value based on the value of the dc voltage detected by the voltage detection unit 10 and the V/F characteristic, which is a frequency-voltage characteristic of the ac voltage set in advance. The V/F characteristic can also be said to be a characteristic in which the output voltage changes with respect to a change in the output frequency. When "1" is output from the abnormal voltage drop determination unit 12 to the frequency limit value calculation unit 13, the frequency limit value calculation unit 13 performs subtraction correction of the calculated frequency limit value. When the output from the abnormal voltage drop determination unit 12 to the frequency limit value calculation unit 13 is "0", the frequency limit value calculation unit 13 does not perform subtraction correction of the calculated frequency limit value.
Fig. 3 is a diagram illustrating a relationship between the dc voltage output from the solar panel 2 shown in fig. 2 and the output frequency of the inverter circuit unit 4. The vertical axis of the graph shown in the upper part of fig. 3 represents the direct voltage "V D ". The vertical axis of the graph shown in the lower part of fig. 3 represents the frequency limit value "f". The horizontal axis of the above 2 graphs represents time.
As described above, the frequency limit value calculation unit 13 calculates the frequency limit value based on the value of the dc voltage. At time t1, the dc voltage starts to decrease, and at time t2 after the set time Δ t has elapsed from time t1, the value of the dc voltage decreases to be equal to or greater than the threshold Δ V TH In this case, the abnormal voltage drop determination unit 12 determines that the voltage drop started at time t1 is an abnormal voltage drop, and outputs "1" indicating the determination result to the frequency limit value calculation unit 13. By judging from an abnormal voltage dropThe unit 12 outputs "1" to the frequency limit value calculation unit 13, and the frequency limit value calculation unit 13 performs subtraction correction of subtracting Δ f from the frequency limit value calculated based on the value of the dc voltage. From time t2 to the elapse of the setting time Δ t, the frequency limit value calculation unit 13 sets the frequency limit value to a value after subtraction correction.
When the time period after time t2 until the set time Δ t elapses is not greater than or equal to the threshold value Δ V TH In the case of a decrease in the value of the dc voltage of (2), the abnormal voltage drop determination unit 12 determines that the dc voltage at time t3 is normal, and sets the output to the frequency limit value calculation unit 13 to "0". When the output from the abnormal voltage drop determination unit 12 to the frequency limit value calculation unit 13 is set to "0", the frequency limit value calculation unit 13 does not perform subtraction correction of the frequency limit value calculated based on the value of the dc voltage. The photovoltaic power generation drive system 1 can suppress an operation failure of the motor 6 due to an abnormal voltage drop by performing subtraction correction of the frequency limit value when the abnormal voltage drop occurs.
Here, a specific method of calculating the frequency limit value by the frequency limit value calculation unit 13 will be described. The frequency limit value calculation unit 13 calculates the frequency limit value based on the V/F characteristic suitable for the application or the load characteristic of the motor 6. The photovoltaic power generation drive system 1 limits the output frequency so that the output voltage of the inverter circuit unit 4 does not become a voltage equal to or higher than the dc voltage stored in the capacitor 3, based on the frequency limit value based on the V/F characteristic. Thus, the photovoltaic power generation drive system 1 can suppress the inverter output power, which is the output power of the inverter circuit unit 4, from being equal to or greater than the solar output power, which is the output power of the solar cell panel 2.
Next, 2 examples of the method of calculating the frequency limit value will be described. The calculation method according to example 1 is a calculation method of a frequency limit value in a case where the application of the motor 6 is a constant torque load application. The frequency limit value calculation unit 13 calculates F, which is a frequency limit value for a constant torque load, based on the V/F characteristic represented by the following expression (1) L1 And (4) performing calculation. Under the formula (1)In each of the formulae described above, V D F0 is the fundamental frequency of the inverter circuit unit 4, V, which is the DC voltage detected by the voltage detection unit 10 f0 Is the fundamental frequency voltage, V, of the inverter circuit part 4 S Is the output starting voltage f of the inverter circuit part 4 S The output start frequency of the inverter circuit unit 4. The output start voltage is an output voltage of the inverter circuit unit 4 when the motor 6 starts driving, and is a lower limit voltage at which the inverter circuit unit 4 can normally operate while the motor 6 is being driven. The output start frequency is the frequency of the output voltage of the inverter circuit unit 4 when the motor 6 starts driving, and is the output frequency at the time of the lower limit voltage. The frequency limit value calculation unit 13 calculates the frequency limit value by substituting each value of the dc voltage, the fundamental frequency voltage, the output start voltage, and the output start frequency into equation (1).
[ mathematical formula 1]
Fig. 4 is a diagram showing an example of the relationship between the frequency limit value and the ac voltage calculated by the frequency limit value calculation unit 13 included in the driving device 5 shown in fig. 2. The vertical axis of the graph shown in fig. 4 represents the frequency limit value "f for constant torque load use L1 ". The horizontal axis of the graph represents the AC voltage "V A ". In fig. 4, the relationship between the frequency limit value and the ac voltage is represented by a straight line graph. The graph shown in fig. 4 shows the V/F characteristic when the motor 6 is used for a constant torque load.
The calculation method according to example 2 is a calculation method of the frequency limit value in the case where the purpose of the motor 6 is to reduce the torque load. The frequency limit value calculation unit 13 calculates F, which is a frequency limit value for use in reducing the torque load, based on the V/F characteristic expressed by the following expression (2) L2 And (6) performing calculation. The frequency limit value calculation unit 13 limits the frequency by substituting each value of the dc voltage, the fundamental frequency voltage, the output start voltage, and the output start frequency into the equation (2)And (5) calculating a system value.
[ mathematical formula 2]
Fig. 5 is a diagram showing another example of the relationship between the frequency limit value and the ac voltage calculated by the frequency limit value calculation unit 13 included in the driving device 5 shown in fig. 2. The vertical axis of the graph shown in FIG. 5 represents the frequency limit value "f for the purpose of reducing the torque load L2 ". The horizontal axis of the graph represents an alternating voltage, i.e. "V A ". In fig. 5, the relationship between the frequency limit and the ac voltage is represented by a graph. The graph shown in fig. 5 shows the V/F characteristic when the motor 6 is used for reducing the torque load. As described above, the frequency limit value calculation unit 13 can change the method of calculating the frequency limit value according to the application or the load characteristic of the motor 6.
The acceleration/deceleration interruption determination unit 14 determines interruption and resumption of rotation of the motor 6 with respect to acceleration or deceleration based on the solar power output and the inverter power output. The drive device 5 suspends acceleration and deceleration and restarts the acceleration and deceleration in accordance with the determination made by the acceleration and deceleration interruption determining unit 14, thereby suppressing an increase in the inverter output power due to the influence of a temporary load increase generated when the motor 6 is accelerated and decelerated. The drive device 5 suppresses the increase in the inverter output power, thereby suppressing the generation of a voltage drop in the dc voltage caused by the inverter output power being equal to or higher than the solar output power. This enables the drive device 5 to suppress an operation failure of the motor 6 during acceleration/deceleration of the motor 6.
Specifically, the acceleration/deceleration-interruption determining unit 14 can obtain the solar output power by the following expression (3). The acceleration/deceleration-interruption determining unit 14 can obtain the inverter output power by the following expression (4). In formula (3), P S For solar output power, P S0 And outputting power for the solar energy reference. When the solar reference output power is the fundamental frequency voltage of the output voltage of the inverter circuit unit 4And outputting power by solar energy. In formula (4), P I I is an output current which is a detection result obtained by the current detection unit 11, for the inverter output power.
[ mathematical formula 3]
[ mathematical formula 4]
P I ＝V D ×I…(4)
The acceleration/deceleration interruption determination unit 14 determines that acceleration is to be interrupted when the calculated inverter output power is equal to or greater than the calculated solar output power. When the calculated inverter output power is smaller than the calculated solar output power, the acceleration/deceleration interruption determination unit 14 determines that acceleration is to be restarted. The acceleration/deceleration interruption determination unit 14 outputs 1-bit information indicating the determination result of interruption and resumption with respect to acceleration. The signal is determined to be "0" when the acceleration is interrupted, and the signal is determined to be "1" when the acceleration is restarted. The signal output from the acceleration/deceleration interruption determination unit 14 is not limited to "0" and "1" as long as it is a signal that can identify the result of determination of interruption and resumption with respect to acceleration.
The output frequency calculation unit 15 calculates a command value of the output frequency based on the determination result of the acceleration/deceleration interruption determination unit 14 and the calculation result of the frequency limit value obtained by the frequency limit value calculation unit 13. The output frequency calculation unit 15 outputs a pulse signal based on the command value calculated by the output frequency calculation unit 15 or the frequency limit value calculated by the frequency limit value calculation unit 13 to the inverter circuit unit 4.
Next, a specific operation of the control unit 20 will be described. Fig. 6 is a flowchart showing an operation flow of the control unit 20 included in the driving device 5 shown in fig. 2. In step S1, the abnormal voltage drop determination unit 12 monitors the abnormal drop of the dc voltage. The abnormal voltage drop determination unit 12 determines that there is an abnormal voltage drop when the decrease in the value of the dc voltage within the set time is equal to or greater than the decrease in the threshold value. The abnormal voltage drop determination unit 12 determines that the dc voltage is normal when there is no decrease in the value of the dc voltage greater than or equal to the threshold value within the set time.
In step S2, the acceleration/deceleration interruption determination unit 14 calculates the inverter output power and the solar output power. In step S3, the frequency limit value calculation unit 13 calculates the frequency limit value based on the value of the dc voltage that is the detection result of the voltage detection unit 10.
In step S4, the frequency limit value calculation unit 13 determines whether or not there is an abnormal voltage drop based on the output from the abnormal voltage drop determination unit 12 to the frequency limit value calculation unit 13. If there is an abnormal voltage drop (Yes at step S4), control unit 20 advances the flow to step S5. On the other hand, if there is No abnormal voltage drop (No at step S4), control unit 20 advances the flow to step S6.
In step S5, the frequency limit value calculation unit 13 performs subtraction correction on the frequency limit value calculated in step S3. In step S6, the output frequency calculation unit 15 determines whether or not the inverter output power is smaller than the solar output power based on the output from the acceleration/deceleration interruption determination unit 14 to the output frequency calculation unit 15. When the inverter output power is smaller than the solar output power (Yes at step S6), the control unit 20 advances the flow to step S8. On the other hand, when the inverter output power is equal to or higher than the solar output power (No at step S6), the control unit 20 advances the flow to step S7.
In step S7, the output frequency calculation unit 15 outputs a pulse signal based on the command value related to the previous frequency command to the inverter circuit unit 4. In step S8, the output frequency calculation unit 15 determines whether or not the frequency limit value calculated in step S3 or step S5 is smaller than the command value of the output frequency calculated this time. If the frequency limit value is smaller than the command value (Yes at step S8), the control unit 20 advances the flow to step S10. On the other hand, if the frequency limit value is equal to or greater than the command value (No at step S8), the control unit 20 advances the flow to step S9.
In step S9, the output frequency calculation unit 15 outputs a pulse signal based on the command value of the output frequency calculated this time to the inverter circuit unit 4. In step S10, the output frequency calculation unit 15 outputs a pulse signal based on the frequency limit value calculated in step S3 or step S5 to the inverter circuit unit 4. Thereby, the control unit 20 ends the operation following the flow shown in fig. 6.
The function of the control unit 20 included in the drive device 5 is realized by using a processing circuit. The processing circuit is dedicated hardware mounted on the drive device 5. The processing circuit may also be a processor executing a program stored in a memory.
Fig. 7 is a diagram showing a hardware configuration in a case where the function of the control unit 20 included in the drive device 5 shown in fig. 2 is realized by using dedicated hardware. The processing circuit 41, which is dedicated hardware, is a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an asic (application Specific Integrated circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof.
Fig. 8 is a diagram showing a hardware configuration in a case where the function of the control unit 20 included in the drive device 5 shown in fig. 2 is realized by using the processor 42. The processor 42 and the memory 43 are communicably connected to each other. The processor 42 executes programs stored in the memory 43.
The processor 42 is a cpu (central Processing unit), a Processing device, an arithmetic device, a microprocessor, a microcomputer, or a dsp (digital Signal processor). The functions of the control section 20 are implemented by the processor 42, software, firmware, or a combination of software and firmware. The software or firmware is described as a program and is stored in the memory 43. The Memory 43 is a built-in Memory such as a nonvolatile or volatile semiconductor Memory, for example, a ram (random Access Memory), a rom (Read Only Memory), a flash Memory, an eprom (Erasable Programmable Read Only Memory), an EEPROM (registered trademark) (Electrically Erasable Programmable Read Only Memory), or the like.
A part of the functions of the control unit 20 may be implemented by dedicated hardware, and the other part of the functions of the control unit 20 may be implemented by software or firmware. As described above, the functions of the control section 20 can be realized by hardware, software, firmware, or a combination thereof.
According to embodiment 1, the photovoltaic power generation drive system 1 calculates the limit value of the output frequency based on the V/F characteristic and the value of the dc voltage output from the solar panel 2, and outputs a pulse signal having a frequency based on the limit value to the inverter circuit unit 4 when the inverter output power is equal to or higher than the solar output power and the limit value is smaller than the command value. The photovoltaic power generation drive system 1 can adjust the inverter output power to be smaller than the solar output power by the limitation of the output frequency by the limitation value based on the V/F characteristic, and can reduce the operation failure of the motor 6. In the photovoltaic power generation drive system 1, since there is no need to repeatedly change the rotation speed of the motor 6 to adjust the output voltage of the solar cell panel 2, the time required for adjusting the solar output power can be shortened. Since the photovoltaic power generation drive system 1 does not need to repeatedly change the rotation speed of the motor 6 at a predetermined timing, it is possible to stably drive the motor 6 without changing the solar output. As a result, the photovoltaic power generation drive system 1 has an effect of reducing the time required for adjustment for controlling the output power of the solar cell panel 2 and enabling stable driving of the load.
The configurations described in the above embodiments are merely examples of the contents of the present invention, and may be combined with other known techniques, and some of the configurations may be omitted or modified within a range not departing from the gist of the present invention.
Description of the reference numerals
The system comprises a photovoltaic power generation driving system 1, a solar panel 2, a capacitor 3, an inverter circuit 4, a driving device 5, a motor 6, a voltage detection unit 10, a current detection unit 11, an abnormal voltage drop judgment unit 12, a frequency limit value calculation unit 13, an acceleration/deceleration interruption judgment unit 14, an output frequency calculation unit 15, a control unit 20, a processing circuit 41, a processor 42 and a memory 43.
Claims (8)
1. A photovoltaic power generation drive system that drives a load with power output from a solar cell panel,
the photovoltaic power generation drive system is characterized by comprising:
an inverter circuit unit that converts the dc voltage output from the solar cell panel to an ac voltage in accordance with a pulse signal and outputs the ac voltage;
a frequency limit value calculation unit that calculates a limit value of an output frequency, which is a frequency of the ac voltage, based on a preset frequency-voltage characteristic of the ac voltage and a value of the dc voltage output by the solar cell panel; and
and an output frequency calculation unit that calculates a command value of an output frequency and outputs a pulse signal based on the command value or the limit value to the inverter circuit unit.
2. The photovoltaic power generation drive system according to claim 1,
the output frequency calculation section outputs a pulse signal based on the limit value when the output power of the inverter circuit section is greater than or equal to the output power of the solar panel and the limit value is smaller than the command value.
3. The photovoltaic power generation drive system according to claim 1,
the output frequency calculation unit outputs a pulse signal based on the command value when the output power of the inverter circuit unit is equal to or greater than the output power of the solar panel and the limit value is equal to or greater than the command value.
4. The photovoltaic power generation drive system according to claim 2,
the output frequency calculation section outputs a pulse signal based on the command value when the output power of the inverter circuit section is greater than or equal to the output power of the solar panel and the limit value is greater than or equal to the command value.
5. Photovoltaic power generation drive system according to any one of claims 1 to 4,
an abnormal voltage drop determination unit for determining whether or not the drop of the DC voltage is an abnormal voltage drop based on a change in the value of the DC voltage output from the solar cell panel,
the frequency limit value calculation unit performs subtraction correction of the calculated limit value when it is determined that the voltage drop is abnormal.
6. Photovoltaic power generation drive system according to any one of claims 1 to 4,
setting the DC voltage to V D F0 is a fundamental frequency of the inverter circuit unit, and V is a fundamental frequency voltage of the inverter circuit unit f0 Setting an output start voltage of the inverter circuit unit to V S And setting the output start frequency of the inverter circuit unit to f S The frequency limit value calculation unit calculates the limit value f based on the following expression (1) L1 The calculation is carried out in such a way that,
[ mathematical formula 1]
7. Photovoltaic power generation drive system according to any one of claims 1 to 4,
setting the DC voltage to V D F0 is a fundamental frequency of the inverter circuit unit, and V is a fundamental frequency voltage of the inverter circuit unit f0 Setting an output start voltage of the inverter circuit unit to V S And setting the output start frequency of the inverter circuit unit to f S The frequency limit value calculation unit calculates the limit value f based on the following expression (2) L2 The calculation is carried out in such a way that,
[ mathematical formula 2]
8. A control method for a photovoltaic power generation drive system having an inverter circuit unit for converting a DC voltage output from a solar panel to an AC voltage in accordance with a pulse signal and outputting the AC voltage, wherein the photovoltaic power generation drive system drives a load with the power output from the solar panel,
the control method for the photovoltaic power generation drive system is characterized by comprising the following steps:
calculating a limit value of an output frequency, which is a frequency of an alternating voltage, based on a preset frequency-voltage characteristic of the alternating voltage and a value of a direct voltage output by the solar cell panel; and
a command value of an output frequency is calculated, and a pulse signal based on the command value or the limit value is output to the inverter circuit unit.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/JP2019/002305 WO2020152830A1 (en) | 2019-01-24 | 2019-01-24 | Photovoltaic power generation drive system and method for controlling photovoltaic power generation drive system |
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| CN113302571B true CN113302571B (en) | 2022-09-23 |
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| CN (1) | CN113302571B (en) |
| WO (1) | WO2020152830A1 (en) |
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- 2019-01-24 WO PCT/JP2019/002305 patent/WO2020152830A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020152830A1 (en) | 2020-07-30 |
| CN113302571A (en) | 2021-08-24 |
| JPWO2020152830A1 (en) | 2021-02-18 |
| JP6615421B1 (en) | 2019-12-04 |
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