JP2004312994A - Power conditioner for passive generator output system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power conditioner enabling a passive generator such as a solar battery to exhibit a higher generating capacity. <P>SOLUTION: The power conditioner for the passive generator has a voltage converter changing voltage of a DC power input from the passive generator, an inverter converting output power of the voltage converter into AC power, and a control circuit controlling operation or the like of the voltage converter. The operating power of the control circuit is supplied from a point except an input of the voltage converter. Or the operating power is supplied from a conventional point, but a load characteristic is improved so as to prevent impedance mismatching with the control circuit in the operating condition of solar battery array. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a power conditioner used in connection with a passive power generator in which active control of an energy source is difficult, such as a solar cell, a wind power generator, or a fuel cell. Related to what makes it highly functional.

  As a passive power generation device output system using such a power conditioner, for example, there is a solar power generation system including a solar cell.

  The relationship between the output current and the voltage, that is, the IV characteristic, which is the power generation characteristic of the solar cell, changes depending on environmental conditions such as solar radiation intensity, cell temperature, and spectral distribution. In addition, long-term exposure to the outdoors is also affected by shading, surface contamination, and deterioration of solar cells. Therefore, it is a difficult-to-treat power supply in which the voltage for optimal operation constantly changes.

  Such a power conditioner that obtains the output of a solar cell has a function of constantly tracking an optimum operating point while changing the input impedance in order to extract the maximum output from the IV characteristics under the respective environmental conditions. Provided. An apparatus that performs this function is called a maximum output point tracker (Maximum Power Point Tracker), and is abbreviated as MPPT. MPPT is specifically realized using a DC-DC converter, that is, a voltage converter. The power conditioner acquires the maximum power output from the solar cell array as DC, converts it into AC, and outputs it.

  FIG. 6 is a diagram illustrating a configuration of a solar power generation system, which is an example of a conventional passive power generation system.

  The solar power generation system 10 includes a solar cell array 13 and a power conditioner 15 to which the solar cell array 13 is connected. A load 31 driven by the generated power is connected to the solar power generation system 10.

The solar cell array 13 is a combination of a plurality of solar cell modules connected in series and parallel. The power conditioner 15 is connected to the output of the solar cell array 13 in series to prevent a backflow diode 17, a power conversion circuit 19 connected to the output side of the diode 17, and for controlling the power conversion circuit 19. And a control circuit 21. The power conversion circuit 19 converts the power supplied to the load 31. Here, the control circuit 21 includes a circuit for monitoring the state of a general commercial AC system in addition to a circuit for directly controlling the power conversion circuit 19, and a circuit for monitoring the state of the storage battery in a system including a storage battery. Various protection devices including the driving prevention function, the user's operation unit and the circuit for the interface are also included. The power conversion circuit 19 monitors the current and voltage of the solar cell array 13 that changes according to environmental changes, while changing the impedance so that the input power is always maximized, and changing the input voltage to a constant voltage value. And an MPPT device 23 composed of a DC-DC converter for converting the data into a video signal. Further, a DC-AC inverter 25 that converts DC power output from the MPPT device 23 into AC having the same voltage and frequency as that of a general commercial power system is provided, and this power is supplied to the load 31. In the solar power generation system 10 shown in FIG. 6, the output point of the solar cell array 13 is IV1, the output point of the diode 17 is IV2, the input point of the power conversion circuit 19 is IV3, and the output point of the power conversion circuit 19 is AC4.
"Solar cells and their applications" Kuwano, Nakano, Kishi, Onishi, Power, p. 58-59, (1994) "Solar power generation" Hamakawa, CMC, p. 202, (2000)

  The control circuit requires power to operate, and this power is obtained from the solar cell array in parallel with the power conversion circuit. This form of acquisition is named (positive acquisition). The ratio of these control circuit powers to the power output from the solar cell array is kept low. However, since dynamic matching with the output characteristics of the solar cell is not taken into account, the output operating voltage of the solar cell slightly deviates from the optimum point of the output characteristics, and the power generation capability cannot be sufficiently exhibited.

  The IV characteristics of the solar cell slightly change at each of the points IV1, IV2, and IV3 in the power conditioner 15 in FIG. In 1 and 2, the voltage slightly drops due to the backflow prevention diode, and in 2 and 3, electric power is obtained for the control circuit, which is affected by the load characteristics.

  FIG. 7 is a graph showing a relationship between voltage and power, which are load characteristics of the control circuit 21. This relationship is obtained from the approximate expression of the power characteristic of Expression (1).

In the graph of FIG. 7, V _R = 300 V and P _C0 = 30 W are set. The characteristic of the operating power of the control circuit 21 shown in FIG. 6 and the equation (1) is as follows. From the backflow prevention diode output section IV2 (FIG. 6), the power conversion as the maximum output point search current and voltage measurement point of the MPPT device is performed. It can be said that the characteristic of the power lost up to the input point IV3 of the circuit 19 (FIG. 6).

In the MPPT of FIG. 6, the current and voltage at IV3 are detected by the control circuit 21, and the operation is performed at the point where the output power, which is the product of the current and the voltage, is maximized. From the load characteristics of the control circuit 21 and the output characteristics Pstc (V) of the solar cell array 13, the IV characteristic curve for IV3 is obtained as P _dyc (V) using the equations (1) and (2). Can be. Here, V is a voltage at the input point IV3 of the power conversion circuit 19. Note that the forward voltage of the diode 17 is almost always constant, and is very low as compared with the rated voltage of the power conditioner 15. Therefore, the forward voltage of the diode 17 can be ignored, and the voltage at IV1 can be regarded as the voltage equal to the voltage at IV2. The control circuit 21 is connected in parallel to the power conversion circuit 19, and the voltage at IV2 is equal to the voltage at IV3. That is, the voltages of IV1, IV2, and IV3 are equal and can be regarded as voltage V.

  Here, the IV characteristics of the solar cell array are different for each environmental condition (insolation intensity, cell temperature, incident light spectrum), and environmental condition data indicating an environmental factor is stored in an equivalent circuit model of the solar cell. It is obtained by calculation by applying. In some cases, it is obtained by using a measured value of a solar cell module.

_{8, P} stc in environmental conditions that voltage _{V pmax of P stc} (V) becomes the maximum is equal to 300V rated (V), and (1), (2) _P was determined by formula _ctrl (V) , P _dyc (V). Here, the capacity of the solar cell array 13 shown in FIG. 6 was assumed to be about 10 kW. In the case of the environmental conditions in this example, the operating voltage V _op set by the MPPT function is 300 V, which is the voltage at which P _dyc (V) is maximized, and is equal to V _pmax . The operating voltage at this time does not deviate from the optimal operating voltage,

  Becomes Thereby, the power generation capability of the solar cell functions high.

FIG. 9 shows P _stc (V), P _ctrl (V), and P _stc (V) when the voltage V _{pmax at} which P _stc (V) is maximum is smaller than the rated voltage of 300 V _under environmental conditions different from those in FIG. ₄ shows a graph of P _dyc (V).

And the optimum operating voltage _{V pmax} at the output point IV1 of the solar cell array in this case, comparing the optimum operating voltage _{V op} of IV3,

The actual operating voltage is shifted from the maximum output operating voltage at the output point of the solar cell array. Than _this, compared to the maximum output _P stc _{(V pmax)} of _{P stc (V),} the maximum output _P stc _{(V op)} operated at optimum operating voltage _{V op} of _{P DYC} (V) it can be seen that slightly less .

  That is, if the power for the control circuit is obtained from the solar cell array as shown in FIG. 6, the IV characteristics change, and the power generation capacity of the solar cell array cannot be fully exhibited.

  An object of the present invention is to provide a power conditioner in which a passive power generation device such as a solar cell can exhibit higher power generation capability.

  The present invention provides an improved power conditioner based on the result of analyzing a problem caused by the change of the IV curve in IV2 and IV3. Specifically, it is a power conditioner for a passive power generator, a voltage converter that changes the voltage of DC power input from the passive power generator, and an inverter that converts output power of the voltage converter into AC power And a control circuit for controlling the operation of the voltage converter and the like, wherein the operating power of the control circuit is supplied from a point other than the input section of the voltage converter. I do. More specifically, the following is provided.

  (1) A power conditioner for a passive power generator, a voltage converter for changing a voltage of DC power input from the passive power generator, and an inverter for converting output power of the voltage converter to AC power, And a control circuit for controlling the operation of the voltage converter and the like, wherein operating power of the control circuit is supplied from an output of the voltage converter.

  According to (1), the operating power of the control circuit of the power conditioner is supplied not from the input point of the voltage converter but from the output point of the voltage converter. Extracting the operating power of the control circuit from the power output point instead of the power input point of the voltage converter to be controlled is referred to as “shade acquisition”. In this shade acquisition, unlike the “yang acquisition” as in the conventional power conditioner, since the operating power characteristics of the control circuit are not affected at the input point of the voltage converter, the IV characteristics of the power supply device must be directly monitored. Can be. Accordingly, the operating voltage does not shift here, and the power generation capacity can be kept high.

  Here, the passive power generation device is a passive power generation device in which active control of an energy source is difficult, and includes a solar cell, a wind power generation, a fuel cell, or the like.

  (2) A power conditioner for a passive power generator, a voltage converter for changing a voltage of DC power input from the passive power generator, and an inverter for converting output power of the voltage converter to AC power, A control circuit for controlling the operation of the voltage converter and the like, further comprising selecting and supplying power from one of an output of the voltage converter and an input of the voltage converter as an operating power of the control circuit, A power conditioner having a selection unit.

  According to (2), unlike the conventional power conditioner, for example, a charge / discharge system including a storage battery is newly connected after the MPPT, that is, as shown in FIG. Supply. However, a power source acquisition unit is provided at the input unit of the voltage converter as a system startup power source at the start of sunshine as before. Then, when the power required for the storage battery is obtained first, this part is cut off. As a result, when it is possible to obtain the shade of the control power, the optimum operating point of the solar cell array does not shift and the efficiency does not decrease, and the power generation capacity can be kept high.

  Here, the power supply acquisition unit provided at the input point of the voltage converter may be a voltage sensor that simply detects the start of power generation of the solar cell array, and the charge / discharge system operates the control circuit when the start of power generation is detected. It is. This system eliminates the need for a DC-DC converter required between the power acquisition unit at the input point and the control circuit power.

  (3) a power conditioner for a passive power generator, a voltage converter for changing a voltage of DC power input from the passive power generator, and an inverter for converting output power of the voltage converter to AC power; A control circuit for controlling the operation of the voltage converter, and a power supply unit for a control circuit capable of supplying power from a power generation device different from the passive power generation device. .

  According to (3), the power for the control circuit is supplied from a small-capacity power generation device (sub solar power generation system) provided with a charge / discharge system as shown in FIG. I do. The subsystem that supplies the power for the control circuit may be another type of power generator such as a wind power generator. In the power conditioner of the present invention including the subsystem, since the power conditioner does not acquire from the power input point of the voltage converter unlike the conventional power conditioner, the operating point of the control circuit at the voltage converter input point ( There is no difference between IV2 and IV3). That is, the operating voltage does not shift here, and the power generation capacity can be kept high.

  (4) A power conditioner for a passive power generator, a voltage converter for changing a voltage of DC power input from the passive power generator, and an inverter for converting output power of the voltage converter to AC power; A control circuit for controlling the operation of the voltage converter and the like. The operating power of the control circuit is supplied from the input section of the MPPT device 23 as shown in FIG. A power conditioner characterized by being designed so that power characteristics are perfectly matched with a solar cell array.

  According to (4), there is provided a power conditioner having a circuit designed such that the load characteristics of the control circuit power supply are as follows.

  That is, it becomes as follows.

  This is intended to completely match the impedances of the solar cell array 13 and the control circuit 21. With such a power conditioner, the optimal operating voltage does not deviate,

It becomes. Thereby, the power generation capability of the solar cell functions high. Further, the voltage _{V R} which takes the minimum value of _{P ctrl} (V) shown in FIG. 7 and Equation (2), the combined constantly _{V pmax} of the solar cell which varies with respect to environmental conditions, is designed to be changed Similarly, the power generation capability of the solar cell can be made to function high in the circuit.

  By considering the method of obtaining the power for the control circuit in the power conditioner, the optimum operating point does not shift, and the power generation capacity of the solar cell can be kept high. If the generated power increases more than the cost increases due to the sophisticated functions of the power conditioner, the price of the entire system decreases. Further, when the power conditioner of the present invention is provided with a charge / discharge system for supplying power for the control circuit, if the power generation capability of the solar cell functions higher than the power loss in the charge / discharge system, the system as a whole may function. Power generation efficiency increases.

  A power conditioner for a passive power generation device, which is an embodiment of the present invention, will be described using an example of a power conditioner for photovoltaic power generation.

[First Embodiment]
FIG. 1 shows a configuration of a photovoltaic power generation system. The solar power generation system 100 includes a solar cell array 113 as a passive power generation device and a power conditioner 115 to which the solar cell array 113 is connected. The load 131 driven by the generated power is connected to the photovoltaic power generation system 100.

  The solar cell array 113 has a plurality of solar cell modules connected in series and parallel. The power conditioner 115 is connected to the solar cell array 113 in series with a diode 117 for preventing backflow, a power conversion circuit 119 connected via the diode 117, and a control unit for controlling the power conversion circuit 119. And a control circuit 121. Here, the control circuit 121 includes, in addition to the circuit for directly controlling the power conversion circuit 119, a circuit for monitoring the state of a general commercial AC system, a circuit for monitoring the state of the storage battery in a system including a storage battery, and a user. The operation unit and the circuit for its interface are included.

  The power conversion circuit 119 changes the impedance so that the input power is always maximized while monitoring the current and the voltage that change according to the change in the environment where the solar cell array 113 is placed, and changes the output voltage to a constant value. An MPPT device 123 composed of a DC-DC converter for conversion and a DC-AC inverter 125 for converting the output power into AC are provided. The AC output is supplied to a load 131. That is, the MPPT device 123 functions as a voltage converter that changes the voltage of the DC power input from the solar cell array 113, and the DC-AC inverter 125 functions as an inverter that converts the output power of the voltage converter into AC power. . In the photovoltaic power generation system 100 shown in FIG. 1, the output point of the solar cell array 113 is IV101, the output point of the diode 117 is IV102, the input point of the power conversion circuit 119 is IV103, and the output point of the power conversion circuit 119 is AC104. , And

  The power conditioner 115 further includes a charge / discharge system 126 that supplies operating power to the control circuit 121 from the output of the MPPT device 123. The charge / discharge system 126 has a built-in storage battery so as to cope with output fluctuations of the solar cell array 113. The power conditioner 115 charges the storage battery with the power generated from the solar cell after the MPPT, and obtains the power as control power.

  The control circuit 121 monitors the voltage and the current at the input point IV103 of the MPPT device 123. Specifically, a voltage / current sensor is inserted between the diode 117 and the MPPT device 123, and the detection is performed by the path indicated by the broken line in FIG. The control circuit 121 controls the MPPT device 123 and the DC-AC inverter 125 based on the detection result.

In this system, almost all of the IV characteristics of the power generated by the solar cell array 113 are input to the MPPT device 123 without being affected by other characteristics. Therefore, regardless of the environmental conditions of the solar cell array 113, the output characteristic P _stc (V) of the solar cell array 113 is kept equal to the power characteristic P _dyc (V) at the input point IV3 of the power conversion circuit 119 ( (See FIG. 2). Therefore, even if the output characteristics of the solar cell array 113 change due to a change in environmental conditions, the input voltage V _op set by the MPPT device 123 is the maximum output operating voltage V _pmax of the solar cell array 113 under the environmental conditions. Becomes equal to That is, the power generation capacity of the solar cell array 113 functions high. During power generation, the charge / discharge system 126 charges a part of the output power from the MPPT device 123 to a built-in storage battery. Then, when the sunshine is extremely small and the solar cell array 113 cannot supply sufficient power for the operation of the control circuit 121, the charged power is supplied to the control circuit 121 so that the MPPT device 123 and the like can continue the operation. To

  When confirming that the method in the above-described embodiment functions higher in the power generation capacity of the solar cell than the conventional method shown in FIG. 6, in each of the systems in FIGS. Measure and compare current, voltage and power. At this time, the measurement of the current and the voltage does not affect the circuit system. Common functions such as a backflow prevention diode, an MPPT, a DC-DC converter, and a DC-AC inverter in the power conditioner have the same characteristics.

  To confirm that the power generation efficiency of the entire system is high, the AC output of AC4 and AC104 in FIGS. 6 and 1 are measured and compared.

Since the IV characteristics of the solar cell array cannot be acquired while the power conditioner is operating, the maximum output operating voltage _Vpmax is derived from the calculated value of _Pstc (V). Then, the calculated value of Pstc (V _pmax ) is obtained and compared with the actual measured value of the output unit IV101 of the solar cell array 113.

[Second embodiment]
FIG. 3 shows an example of the configuration of another solar power generation system. This embodiment is different from the first embodiment in that the charge / discharge system 226 is connected to the input unit of the MPPT device 223. The other points are the same, and the description is omitted.

  In the power conditioner 215 of the present embodiment, a charge / discharge system 226 is provided as in the first embodiment. Further, as a system startup power supply at the start of sunshine or the like, a positive power acquisition unit is provided between the IV 202 and the IV 203 as before. The charge / discharge system 226 also supplies power from the input unit of the MPPT device 223 as operating power of the control circuit 221. That is, at the start of power generation of the solar cell array 213, the power from the input unit of the MPPT device 223 is selected, and the power is sent to the control circuit 221. When the power required for the storage battery is obtained, this part is cut off. Then, the power from the output of the MPPT device 223 is selected and sent to the control circuit 221. That is, the charge / discharge system 226 functions as a power selection unit. In this way, even after the storage battery has no power and the control circuit 221 does not operate, the power is directly supplied from the solar cell array 213, the power is sufficiently generated, and after the MPPT device 223 starts operating. And its output power can be stored. As a result, when it is possible to obtain the shade of the power for the control circuit, the optimum operating point of the solar cell array 213 does not shift and the efficiency does not decrease, and the power generation capacity can be kept high.

  In order to start the control in the power conditioner 215, the capacity of the storage battery can be set small by providing a power acquisition unit that is a path from the input unit of the MPPT device 223 as a system startup power at the start of sunshine. If power generation equal to or higher than the control power is started by the MPPT control, power is also supplied to the charge / discharge system, and power for the control circuit is also supplied stably.

  When confirming that the method in the above-described embodiment functions higher in the power generation capability of the solar cell than the conventional method shown in FIG. 6, in each of the systems in FIGS. Measure and compare current, voltage and power. At this time, the measurement of the current and the voltage does not affect the circuit system. Common functions such as a backflow prevention diode, an MPPT, a DC-DC converter, and a DC-AC inverter in the power conditioner have the same characteristics.

  To confirm that the power generation efficiency of the entire system is high, the AC output of AC4 and AC204 in FIGS. 6 and 3 are measured and compared.

Since the IV characteristics of the solar cell array cannot be acquired while the power conditioner is operating, the maximum output operating voltage Vpmax is derived from the calculated value of P _stc (V). Then, the calculated value of P _stc (Vpmax) is obtained and compared with the actual measured value of the output unit IV201 of the solar cell array 213. However, when the power for the control circuit is explicitly acquired, the optimum operating voltage Vop is obtained from the equations (1) and (2) based on the load characteristic Pctrl (V) of the control circuit acquired in advance. Then, a calculated value of Pstc (Vpmax) is obtained and compared.

[Third embodiment]
FIG. 4 shows an example of the configuration of yet another solar power generation system. The present embodiment is different from the first embodiment in that the charging / discharging system 326 is connected to a solar cell module 328 provided separately from the solar cell array 313. Except for supplying power for the control circuit from the small-capacity sub-photovoltaic power generation system, the configuration is the same as that of the first embodiment, and thus the description is omitted.

  4 is supplied with power from a solar cell module 328 that is a power generation device different from the solar cell array 313, and supplies necessary operating power to the control circuit 321. The charge / discharge system 326 includes a charge / discharge control device and a storage battery. It is necessary to set the capacity of the storage battery so that control can be performed even after the bad weather continues. However, since the capacity of the storage battery including the power conditioner increases, the capacity of the storage battery is kept to a minimum.

  In order to confirm that the power in FIG. 4 has increased compared to the system in FIG. 6, the power in AC4 in FIG. 6 and the power in AC304 in FIG. 4 are compared. At this time, the solar cell array capacity in FIG. 6 is set to be equal to the total of the solar cell array capacity and the solar cell module capacity in FIG. In this system, it is not necessary to provide a voltage switching function in the charge / discharge system 326, so the configuration of the power conditioner 315 is simple.

[Fourth embodiment]
A power conditioner according to yet another embodiment will be described. In the power conditioner 15 according to the conventional connection configuration shown in the block diagram of FIG. 6, the design is made such that the characteristic of the operating power of the control circuit 21 is substantially represented by the following equation.

  That is, it becomes as follows.

In such a power conditioner, since the operating power of the control circuit 21 is constant, the difference between P _stc (V) and P _dyc (V) is constant in the voltage range of Pstc (V)> C. In this case, the _{voltages at which} P _stc (V) and P _dyc (V) are maximum are also equal. That is,

  Becomes In such a power conditioner that the impedance of the solar cell array 13 and the control circuit 21 are perfectly matched, the optimum operating voltage does not deviate, so that the power generation capability of the solar cell functions high.

  Although the embodiments have been described above, the present invention is not limited to the above-described embodiments, and includes modifications and improvements as long as the object of the present invention can be achieved.

  In the present embodiment, the photovoltaic power generation system using a solar cell has been described, but the subject of the present invention is not limited to this. That is, the present invention can be widely applied to an output system using a passive type power generation device whose generated energy is passive, such as a solar cell or a wind power generator. For example, it is easy for a thermal power generation or a hydroelectric power generation device to actively control generated energy. However, the above-described passive power generation device needs to dynamically and sufficiently adapt the impedance of the power controller according to the state of the energy source provided to the power generation device. FIG. 5 shows an example of output power-voltage characteristics in a wind power generator as an example of a passive power generator different from a solar cell. As the rotational speed increases, the output increases, but at the same time, the voltage at which the maximum output is increased. In such a passive power generation system, as in the previous embodiments, the power generation capacity is increased by sufficiently considering the impedance matching by changing the operation power supply path of the connected control circuit. Can be kept.

  Also, in a fuel cell, if it is assumed that power is supplied to a dynamically fluctuating load such as an automobile or home use, it is necessary to change the generated energy (for example, the Institute of Electrical Engineers of Japan, next generation fuel cell power generation system). (Technical Survey Special Committee, “Fuel Cell Technology,” pp. 70-71, Ohmsha). In the point that the output power-voltage characteristic changes state with respect to load fluctuation like a fuel cell, it has the property of a passive type like the solar power generation system and the wind power generation system, and the power supply of the control circuit. By sufficiently considering the impedance matching by changing the path, the power generation capacity can be kept high.

It is a block diagram of a solar power generation system concerning a 1st embodiment of the present invention. 5 is a graph illustrating an example of power-voltage characteristics appearing at an input point of a power conversion circuit in the solar power generation system according to the first embodiment of the present invention. It is a block diagram of a photovoltaic power generation system according to a second embodiment of the present invention. It is a block diagram of a photovoltaic power generation system according to a third embodiment of the present invention. It is a graph which shows the example of the output power-voltage characteristic of a wind power generator. It is a block diagram of the conventional solar power generation system. It is a graph which shows the example of the power-voltage characteristic required for operation of the control circuit in the conventional photovoltaic power generation system. It is a graph which shows the example of the power-voltage characteristic when the rated input voltage value of a power conditioner and the optimal operation voltage of a solar cell array are equal in the conventional photovoltaic power generation system. It is a graph which shows the example of the electric power-voltage characteristic when the optimal operation voltage of a solar cell array is smaller than the rated input voltage value of a power conditioner in the conventional solar power generation system.

Explanation of reference numerals

10, 100, 200, 300 Photovoltaic power generation system 13, 113, 213, 313 Solar cell array (passive power generation device)
15, 115, 215, 315 Power conditioner 17, 117, 217, 317 Diode 19, 119, 219, 319 Power conversion circuit 21, 121, 221, 321 Control circuit 23, 123, 223, 323 MPPT device (voltage converter)
25, 125, 225, 325 DC-AC inverters 31, 131, 231, 331 Loads 126, 226, 326 Charge / discharge system 328 Solar cell module (sub power supply)

Claims (3)

A power conditioner for a passive power generator,
A voltage converter that changes the voltage of the DC power input from the passive power generator,
An inverter that converts output power of the voltage converter into AC power;
A control circuit for controlling the operation of the voltage converter and the like,
A power conditioner, wherein operating power of the control circuit is supplied from an output of the voltage converter. A power conditioner for a passive power generator,
A voltage converter that changes the voltage of the DC power input from the passive power generator,
An inverter that converts output power of the voltage converter into AC power;
A control circuit for controlling the operation of the voltage converter, and the like,
A power conditioner comprising: a power selection unit that selects and supplies power from one of an output of the voltage converter and an input of the voltage converter as operating power of the control circuit. A power conditioner for a passive power generator,
A voltage converter that changes the voltage of the DC power input from the passive power generator,
An inverter that converts output power of the voltage converter into AC power;
A control circuit for controlling the operation of the voltage converter, and the like,
A power conditioner comprising a control circuit power supply unit capable of supplying power from a power generation device different from the passive power generation device.

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