Power conversion device and power generation system

Abstract

To provide a power conversion device in which control of a plurality of types of power generators can be switched by a switching control method in a configuration in which the plurality of types of power generators are connected.SOLUTION: A power conversion device that performs power conversion on power input from each of a plurality of types of power generators and outputs the power to a load, includes a common power conversion circuit to which the load is connected and performs the power conversion wherein each of the plurality of types of power generators is connected to the common power conversion circuit via a switching unit, and includes a control unit that controls each of the plurality of types of power generators wherein each control program for controlling each of the plurality of types of power generators is switched and used, and at the same time in the control unit. The power input from each of the plurality of types of power generators is switched and input to the common power conversion circuit by the switching unit. In the control unit, the control program is switched to a control program corresponding to the power generator and used.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a power conversion device that converts input power and outputs the converted power, and a power generation system including the same. [Background technology]

[0002] Conventionally, power generation systems such as photovoltaic power generation systems and wind power generation systems have been widely used. In these power generation systems, a power conversion device is used that performs power conversion such as AC / DC conversion and voltage conversion on the power input from a generator such as a photovoltaic generator or a wind power generator, and outputs the power to a load such as a storage battery or an electrical device. Some of these power conversion devices are connected to multiple types of generators and switch between the power input from each generator.

[0003] The prior art described in Patent Document 1 discloses a power conversion device that switches input between a DC power source and a commercial AC power source to supply power to an electrical device. The prior art described in Patent Document 2 discloses a power conversion device to which multiple types of power generation devices, such as a gas power generation device and a solar power generation device, are connected and switched between to store surplus power in a storage battery. The prior art described in Patent Document 3 discloses a power switching device that switches input between an independent power source such as solar power generation and a commercial AC power source, and by inputting a switching signal to a switching circuit to switch input between the independent power source and the commercial AC power source, both the independent power source and the commercial AC power source are input to a single power switching device, reducing the number of parts and manufacturing costs. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-220398 A [Patent Document 2] JP 2022-033244 A [Patent Document 3] JP 2022-114279 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the power conversion devices of Patent Documents 1 and 3 only disclose the configuration of the hardware that switches input between a commercial AC power source and another power source. Patent Document 2, which switches between multiple types of power generation devices, including a gas power generation device and a solar power generation device, only discloses the configuration of the hardware that switches input, including the configuration by a switching signal when responding to a power outage, the cover structure, and the wiring structure, and does not mention anything about the switching method of the control of the generators when switching between multiple types of power generation devices (generators). If a switching control method is not taken into account for switching the control when switching between such multiple types of generators, it may not be possible to generate power appropriately or with high efficiency, and it may even lead to unstable operation during power generation.

[0006] In order to solve the above-mentioned problems of the conventional technology, an object of the present invention is to provide a power conversion device and a power generation system in which multiple types of generators are connected and the control of the multiple types of generators can be switched by a predetermined switching control method. [Means for solving the problem]

[0007] In order to achieve the above object, a power conversion device according to the present invention comprises: A power conversion device that converts power input from each of a plurality of types of generators and outputs the power to a load, a common power conversion circuit to which the load is connected and which performs the power conversion, and each of the plurality of types of generators is connected to the common power conversion circuit via a switching unit; A control unit is provided for controlling each of the plurality of types of generators, and a control program for controlling each of the plurality of types of generators is used in the control unit. Where: the switching unit switches the electric power input from each of the plurality of types of generators and inputs the power to the common power conversion circuit, In the control unit, at the same time as the switching, the control program may be switched to a control program corresponding to that generator and used. In the above configuration, the multiple types of generators may include a solar generator and a wind generator.

[0008] The power conversion device according to the present invention is configured such that each of the multiple types of generators is connected to the common power conversion circuit via the switching unit, and includes a control unit that controls each of the multiple types of generators, and a control program for controlling each of the multiple types of generators is used in the control unit. Therefore, the generators can be appropriately controlled. Furthermore, using this configuration, it can be applied to a configuration in which the control of the multiple types of generators can be switched by a predetermined switching control method. Here, consider a case in which the power input from each of the multiple types of generators is switched by the switching unit and input to the common power conversion circuit, and the control program is switched to a control program corresponding to the generator at the same timing as the switching in the control unit and used. As a result, the power conversion device according to the present invention can switch the control of the multiple types of generators by the switching control method as described above. As a result, it is possible to perform appropriate or highly efficient power generation, and further the possibility of causing unstable operation in the power generation operation can be reduced. For example, when the multiple types of generators include a solar power generator and a wind power generator as described later, the possibility of achieving such an effect is increased.

[0009] Three-phase AC power may be output from the wind power generator, and the switching unit of the wind power generator may be a switch that short-circuits the three phases. For example, in a configuration including a diode rectifier bridge to which the three-phase output of a wind power generator is input, it has been necessary to provide the switching unit such as a switch separately on the output side of the diode rectifier bridge in the past, but in the above configuration, the switching unit as the switch is provided on the output side of the wind power generator, and can also serve as a brake mechanism that short-circuits the three phases, for example, by stopping the wind power generator to stop its output.

[0010] The wind power generator has a safety mechanism for stopping the rotation of the rotor blades, and the simultaneous timing during the above-mentioned use includes a delay time from when the switching unit switches from the power input from the solar power generator to the power input from the wind power generator and the power is input to the common power conversion circuit, and when the control unit switches from a control program corresponding to the solar power generator to a control program corresponding to the wind power generator, until the control unit uses the control by the control program corresponding to the wind power generator, during which the safety mechanism stops the power generation by the wind power generator. The safety mechanism includes, for example, an electric or mechanical brake mechanism. When the power generation method is switched from solar power generation to wind power generation, if the input to the common power conversion circuit is switched from the solar power generator to the wind power generator while the control unit does not appropriately switch from the control program corresponding to the solar power generator to the control program corresponding to the wind power generator and start use, the wind power generation may become unstable because it is not controlled by the corresponding control program, and may fall into a so-called runaway state. However, in the above configuration, the safety mechanism stops power generation by the wind power generator during the delay time until the control unit uses the control program corresponding to the wind power generator, thereby preventing the wind power generator from becoming unstable and going out of control.

[0011] The switching unit may include an interlock circuit. The wind power generator may further include at least one of a detection unit that detects the rotation speed of a rotor of the wind power generator and a detection unit that detects the input power from the wind power generator, and a detection value from the detection unit may be input to the control unit. The wind power generator may further include a clock circuit, and time information from the clock circuit may be input to the control unit.

[0012] The power generation system according to the present invention comprises: The power conversion device includes the solar power generator, the wind power generator, and the power conversion device according to any one of claims 2 to 4, and the switching unit inputs power from either the solar power generation or the wind power generation to the common power conversion circuit.

[0013] According to the above configuration, the power generation system of the present invention is configured to perform both solar power generation and wind power generation as power generation methods, and is equipped with a power conversion device having the above-mentioned functions, thereby making it possible to achieve the above-mentioned effects. Effect of the Invention

[0014] The power conversion device and power generation system according to the present invention are configured to have a plurality of types of generators connected thereto, and the control of the plurality of types of generators can be switched by a predetermined switching control method. [Brief description of the drawings]

[0015] [Figure 1A] FIG. 1 is a diagram showing an example of a circuit configuration of a wind power generation system using a non-insulated converter. [Figure 1B] FIG. 1 is a diagram showing an example of a circuit configuration of a photovoltaic power generation system using a non-insulated converter. [Diagram 2] FIG. 1 is a diagram showing an example of a circuit configuration in which the outputs of wind power generation and solar power generation are shared using two non-isolated converters. [Diagram 3] FIG. 1 is a characteristic diagram of output voltage or rotation speed and output power in MAP control of wind power generation. [Figure 4] 1 is a characteristic diagram of output voltage and output power in MPPT control of wind power generation. [Diagram 5] FIG. 1 is a diagram showing an example of a circuit configuration for wind power generation and solar power generation using a common non-insulated converter in a power generation system according to an embodiment. [Figure 6] FIG. 2 is a schematic diagram showing an example of an interlock circuit used in the power generation system. [Figure 7] 2 is a diagram illustrating an example of a detection means used in the power generation system and an example of a method for determining a power generation method. FIG. [Figure 8] FIG. 4 is a flow diagram for switching the power generation method in the power generation system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power conversion device and a power generation system according to an embodiment of the present invention will be described with reference to the drawings.

[0017] (Comparative Technology) FIG. 1A shows an example of a circuit configuration of a wind power generator using a non-insulated converter. In this embodiment, the power converter 1w is shown, in which a wind power generator (WG) 2, which is a three-phase AC generator in this embodiment, is connected via a diode rectifier bridge (full bridge with six diodes) DB on the upstream side, and a load LD1, which is, for example, a storage battery, is connected to output terminals OP1 (high-voltage line side, Hi side) and OP2 (low-voltage line side, Lo side), and converts and outputs the power input from the wind power generator 2 toward the storage battery LD1. The power converter 1w includes, for example, a DC-DC converter, and in this figure, includes a step-down chopper circuit. Specifically, the power converter 1w has an FET1 and a reactor L1 in series on the high-voltage line, and has smoothing capacitors C1, C2 and a diode Di1 between the high-voltage line and the low-voltage line.

[0018] FIG. 1B shows an example of a circuit configuration of photovoltaic power generation using a non-insulated converter. In the figure, a photovoltaic power generator (PV) 3 such as a solar cell is connected on the upstream side, and a load LD2, for example a storage battery, is connected at output terminals OP3 (high-voltage line side, Hi side) and OP4 (low-voltage line side, Lo side), and a power conversion device 1p is shown that converts and outputs the power input from the photovoltaic power generator 3 toward the storage battery LD2. The power conversion device 1p includes, for example, a DCDC converter, and in the figure, includes a step-down chopper circuit similar to the above. Specifically, the power conversion device 1p has the same configuration as the above power conversion device 1w, but the specifications of the above capacitor in the DCDC converter, such as the capacity, are different between the power conversion device 1p and the power conversion device 1w.

[0019] FIG. 2 shows a circuit configuration in which the outputs of wind power generation and solar power generation using two non-insulated converters are shared. In the figure, two different power conversion devices are provided separately for each generator: the power conversion device 1w and the power conversion device 1pp, which is similar to the power conversion device 1p except that the capacitor C4 is removed. Here, the output voltage of the power conversion device 1w and the output voltage of the power conversion device 1pp are made almost equal by controlling FET1 and FET2. Since the voltages of the output terminals OP1 and OP2 and the voltages of the output terminals OP3 and OP4 often have the same potential like a storage battery, it is possible to share the output side, such as the common output terminals OP13 (high voltage line side, Hi side) and OP24 (low voltage line side, Lo side) shown in the figure. However, looking at the input side, the input from the wind power generator 2 is three-phase AC, and the wind power generator 2 is equipped with a brake mechanism (not shown in the figure) described below that stops the rotation of the rotating shaft and rotor blades (not shown), while the input from the solar power generator 3 is DC, so the circuit configurations and input voltages are different, making commonalization difficult, and even if commonalization were to be attempted, the parts that can be commonalized would be limited. These are the points that must be considered in the hardware (HW) configuration in the figure.

[0020] Regarding generator control (software), wind power generation mainly uses MAP control that references a map (or table) corresponding to the characteristics shown in Figure 3, whereas solar power generation generally uses MPPT (Maximum Power Point Tracking) control with characteristics as shown in Figure 4 (the circle indicates the maximum power point), so in addition to the difference in HW configuration as described above, the control content is also different in the configuration of Figure 2. Therefore, there are also such points to consider in the software (SW) configuration.

[0021] In addition, solar power generation is possible only during the day, and while wind power can generate electricity even at night, it can only generate electricity when the wind is blowing, so there are not many situations in which solar power generators and wind power generators are operating at the same time. For this reason, even if two power conversion circuits are installed as in the configuration of Figure 2, there are many cases where one circuit is not used at all, and the hardware configuration has high redundancy.

[0022] (Configuration of this embodiment) FIG. 5 shows a schematic diagram of a power generation system SYS including a power conversion device 1 according to an embodiment of the present invention. The power generation system SYS of this embodiment further includes a solar power generator and a wind power generator. In this embodiment, the power conversion device 1 performs power conversion on power from different input destinations of a plurality of types of generators including a wind power generator (WG) 200 and a solar power generator (PV) 300, and outputs the converted power to a load LD3. The power conversion device 1 has a configuration almost similar to that of the above-mentioned power conversion devices 1w and 1p. In detail, the figure shows a power conversion device 1 including a common, i.e., only one, power conversion circuit 100 to which a wind power generator 200, which is a three-phase AC generator, is connected on the upstream side via a diode rectifier bridge DB, a solar power generator 300 such as a solar cell is connected on the upstream side, and a load LD3, which is, for example, a storage battery, is connected at output terminals OP5 (high voltage line side, Hi side) and OP6 (low voltage line side, Lo side). The power conversion circuit 100 includes, for example, a DC-DC converter, and in the figure, includes a step-down chopper circuit. In the circuit shown in Fig. 5, most of the parts can be shared compared to the circuit shown in Fig. 2, and the redundancy of the HW configuration is reduced, which contributes to cost reduction. The power conversion device 1 also includes a control unit 400 that controls each of the multiple types of generators.

[0023] The (common) power conversion circuit 100 is connected to each of the multiple types of generators via a switching unit ST (ST1, ST2) so that simultaneous input will not cause a problem. In FIG. 5, specifically, the wind power generator 200 is connected to the power conversion circuit 100 via a switching unit ST1 (and further via a diode rectifier bridge DB), and the solar power generator 300 is connected to the power conversion circuit 100 via a switching unit ST2. The switching units ST (ST1, ST2) switch the power input from each of the multiple types of generators and input it to the common power conversion circuit 100. The switching unit ST of this embodiment may include an interlock circuit described later. The wind power generator 200 in the figure has a rotation sensor (RD) 211, which is a detection unit that detects the rotation speed of the rotor blades, and is a three-phase AC generator that outputs three-phase AC power.

[0024] The switching unit ST1 is a switch capable of short-circuiting the three phases, and includes an interlock element MC1. When the element MC1 is turned on, the short-circuiting between the three phases is not performed, and wind power generation is selected as the power generation method, and when the element MC1 is turned off, the short-circuiting between the three phases is performed, and as a result, a safety function that stops the rotation of the rotor is activated. That is, the switching unit ST1 also operates as a safety mechanism. The safety mechanism is not limited to the short-circuiting between the three phases. When the element MC1 is turned off, the inputs of the three phases to the diode rectifier bridge DB are short-circuited and have the same potential, and a depletion layer is generated between the anode and cathode in each diode included in the diode rectifier bridge DB, and all the anodes and cathodes are in a so-called disconnected state. The switching unit ST2 of the solar power generator 300 includes a series interlock element MC2 that can cut off (OFF) the conduction. When the element MC2 is turned on, the conduction is performed, and solar power generation is selected as the power generation method, and when the element MC2 is turned off, the conduction is cut off. The interlock elements MC1 and MC2 perform the following so-called mutual interlock operation. The interlock elements MC1 and MC2 may be magnet switches or the like, but may also be semiconductor switches such as FETs.

[0025] In the mutual interlock operation, if two of the two elements MC1 and MC2 are turned on together and an abnormality occurs, the circuit turns one on and the other off for equipment protection and safety reasons, and even if two are turned on by mistake, the one that operated first is given priority and the other can be turned off so that it does not operate. As in the example interlock circuit shown in Figure 6, when a signal to assert to the command relay LY1 is output from the control unit 400, the element MC1 is turned on and the element MC2 is turned off (open) [arrow A in the figure], and the relay LY2 is also turned on and the ON signal is output to the control unit 400. As a result, the control unit 400 understands that the element MC1 is turned on, that is, that the power generation method is wind power generation. Furthermore, when the control unit 400 outputs a signal to deassert (or negate) the command relay LY1, the element MC1 is turned OFF, the element MC2 is turned ON (conductive) [arrow B in the figure], the ON of the relay LY2 is released, and the control unit 400 recognizes the release of the ON signal of the relay LY2. This allows the control unit 400 to grasp that the element MC2 is turned ON, i.e., that the power generation method is solar power generation.

[0026] 5 uses a control program for controlling each of the multiple types of generators. In the control unit 400 of this embodiment, each control program is further switched and used (or executed); specifically, in this embodiment, a control program corresponding to a solar power generator or a control program corresponding to a wind power generator is switched and used. As described above, in this embodiment, when the power input from the solar power generator 300 is selected (i.e., the power generation method is set to solar power generation), "(HW side operation) the switching unit ST switches to the power input from the solar power generator 300 and the power is input to the common power conversion circuit 100" at the same timing, and "(SW side operation) the control unit 400 switches to the control program corresponding to the solar power generator and uses it." In addition, in this embodiment, when the power input from the wind power generator 200 is selected (i.e., the power generation method is wind power generation), "(HW side operation) the switching unit ST switches to the power input from the wind power generator 200 and the power is input to the common power conversion circuit 100" at the same timing, and "(SW side operation) the control unit 400 switches to a control program corresponding to the wind power generator and uses it." In addition, in the above-mentioned simultaneous timing operations, either the HW side operation or the SW side operation may be started first, and if the HW side operation and the SW side operation are started to switch the power generation method, they can be the subject of determining whether they are simultaneous timing operations or not. Here, the above-mentioned simultaneous timing should not be interpreted as the same as the so-called simultaneous meaning between multiple timings (instantaneous error is not allowed), and it should be understood that a predetermined minute time may be included between the multiple timings within a range that can be considered to be simultaneous, for example, within a time range in which the effect of the present application is achieved. Therefore, for example, the simultaneous timing may include a delay time described later.

[0027] The power generation system SYS also includes a detection means (detection unit) 210 shown in the left diagram of Fig. 7. Specifically, the detection means 210 includes the above-mentioned rotation sensor (RD) 211, which is a detection unit that detects the rotation speed of the rotor, a voltage sensor 212 that detects the input voltage Vw (Fig. 5) from the wind power generator 200 or the phase-to-phase voltage Vph (Fig. 5) of the wind power generator 200, a voltage sensor 213 that detects the input voltage Vp (Fig. 5) from the solar power generator 300, an actinometer 214 that detects the amount of solar radiation in the outside world, a panel temperature sensor 215 that detects the temperature of the solar power generation panel, and, for example, a 24-hour timer (timing circuit) 216 for detecting time information. The detection values ​​and time information from the detection units are input to the control unit 400.

[0028] As shown in the right diagram of Fig. 7, the control judgment conditions under which the control unit 400 selects wind power generation are when the input voltage Vw (Fig. 5) or the phase-to-phase voltage Vph (Fig. 5) exceeds a predetermined threshold, when the rotation speed of the rotor exceeds a predetermined threshold, when the time information passes a predetermined time or is included in a predetermined time period or is out of a predetermined time period, when the input voltage Vp (Fig. 5) becomes equal to or lower than a predetermined threshold or when the input voltage Vp falls below the input voltage Vw, etc. For example, when it is judged that the input voltage Vw or the phase-to-phase voltage Vph or the rotation speed of the rotor is lower than a predetermined threshold, the control unit 400 does not select wind power generation. Moreover, the control judgment conditions under which the control unit 400 selects solar power generation are when a predetermined time has passed since switching to wind power generation, when the rotation speed of the rotor is equal to or lower than a predetermined threshold, when the time information has passed a preset time or is included in a predetermined time period or is out of the predetermined time period, when the input voltage Vp exceeds a predetermined threshold, when the input voltage Vw or inter-phase voltage Vph is equal to or lower than a predetermined threshold or when the input voltage Vp is equal to or higher than the input voltage Vw, etc. For example, when it is determined that it is nighttime based on the amount of solar radiation in the outside world or time information, the control unit 400 does not select solar power generation.

[0029] Based on the above operations, the power generation system SYS switches the power generation method according to, for example, the flow diagram shown in FIG. 8 and generates power by each power generation method. In this embodiment, solar power generation is performed first, and when the operation starts, the flow shifts to solar power generation and the power generation starts (step S100). In the next step S200, the control unit 400 determines the power generation method according to the switching determination condition to wind power generation, and if the power generation is to be switched to wind power generation, the process proceeds to step S300 (YES in step S200), and if the solar power generation is to be continued, the process returns to step S100 (NO in step S200). In step S300, the power generation method is switched to wind power generation. In response to this, in step S400, a signal to assert the command relay LY1 (FIG. 6) is output from the control unit 400. Therefore, the control program is switched to MAP control for wind power generation, for example, referring to the above map or table (step S500). In the next step S600, the control unit 400 determines the power generation method based on the switching determination condition to solar power generation, and if switching (returning) to solar power generation, proceeds to step S700 (YES in step S600), and if wind power generation is to be continued, returns to step S300 (NO in step S600). In response to this, in step S700, the control unit 400 outputs a signal to deassert the command relay LY1. Thus, the control program is switched to MPPT control for solar power generation (step S800). Thereafter, the control unit 400 transitions to step S100 and the above flow is repeated.

[0030] Here, when the power generation method is switched from solar power generation to wind power generation, the following points need to be noted in the simultaneous operation. When the power generation method is switched from solar power generation to wind power generation, if the input to the common power conversion circuit is switched from the solar power generator to the wind power generator, but the control unit does not properly switch from a control program corresponding to the solar power generator to a control program corresponding to the wind power generator and start using (executing), the wind power generation may become unstable because it is not controlled by the corresponding control program, and may fall into a so-called runaway state. Therefore, the wind power generator 200 is provided with the safety mechanism ST1 (implemented by the above-mentioned three-phase short-circuit switch in this embodiment) that stops the rotation of the rotor blades. Here, the simultaneous timing during use includes a delay time from when the switching unit ST switches from the power input from the solar power generator 300 to the power input from the wind power generator 200, inputting the power to the common power conversion circuit 100, and switching from the control program corresponding to the solar power generator 300 to the control program corresponding to the wind power generator 200 in the control unit 400, until the control according to the control program corresponding to the wind power generator 200 is used in the control unit 400. During the delay time, the safety mechanism ST1 stops the rotor to stop power generation by the wind power generator. In this way, the safety mechanism ST stops power generation by the wind power generator 200 during the delay time until the control according to the control program corresponding to the wind power generator 200 is used in the control unit 400.

[0031] The above-mentioned "until the control unit 400 uses the control program corresponding to the wind power generator 200" means, for example, until the control unit 400 executes the control program corresponding to the wind power generator 200 and the wind power generator can operate stably or in a steady state under the control. As a result, the wind power generator can be prevented from becoming unstable and from going out of control. When the power generation method is switched from wind power generation to solar power generation, the efficient power generation by MPPT control is not performed at first, so the above-mentioned unstable state or so-called runaway state will not occur, and therefore there is no need to take care to stop the wind power generation by the above-mentioned safety mechanism ST.

[0032] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. For example, in the above embodiment, the wind power generator 200 and the solar power generator 300 are exemplified as multiple types of generators, but are not limited to these, and may include fuel cell type power generation, etc. In addition, multiple types of generators may include multiple generators of the same type (same type) because even if the generators are the same type, they may be considered to be the same as different types of generators due to individual differences, and may be considered to be the same as the above embodiment. [Explanation of symbols]

[0033] 1, 1p, 1pp, 1w power converter 100 (Common) Power Conversion Circuit 2,200 Wind turbines (multiple types of generators) 210 Detection means (detection unit) 211 Detector for detecting rotation speed 212 A detector for detecting input power from a wind power generator 216 24-hour timer (timing circuit) 3,300 Solar generators (multiple types of generators) 400 Control section ST.ST2 Switching section, interlock circuit ST1 Switching section, interlock circuit, switch, safety mechanism SYS Power Generation System LD1, LD2, LD3 Storage battery (load)

Claims

1. A power conversion device that converts power input from each of a plurality of types of generators and outputs the power to a load, a common power conversion circuit to which the load is connected and which performs the power conversion, and each of the plurality of types of generators is connected to the common power conversion circuit via a switching unit; a control unit that controls each of the plurality of types of generators, and a control program for controlling each of the plurality of types of generators is used in the control unit; Power conversion equipment.

2. The power conversion device according to claim 1, the switching unit switches the electric power input from each of the plurality of types of generators and inputs the power to the common power conversion circuit, In the control unit, at the same time as the switching, the control program is switched to a control program corresponding to the generator and used. Power conversion equipment.

3. The power conversion device according to claim 1, The multiple types of generators include solar generators and wind generators. Power conversion equipment.

4. The power conversion device according to claim 3, Three-phase AC power is output from the wind power generator, The switching unit of the wind power generator is a switch that short-circuits the three phases. Power conversion equipment.

5. The power conversion device according to claim 3, The wind power generator has a safety mechanism that stops rotation of the rotor blades, The simultaneous timing of the above use includes: The switching unit switches from the power input from the solar power generator to the power input from the wind power generator, and the power is input to the common power conversion circuit, When the control program is switched from a control program corresponding to a solar power generator to a control program corresponding to a wind power generator in the control unit, A delay time until the control by the control program corresponding to the wind power generator is used in the control unit is included, during the delay time, stopping power generation by the wind power generator using the safety mechanism; Power conversion equipment.

6. The power conversion device according to any one of claims 3 to 5, The switching unit includes an interlock circuit. Power conversion equipment.

7. The power conversion device according to any one of claims 3 to 5, Further, at least one of a detection unit for detecting a rotation speed of a rotor of the wind power generator and a detection unit for detecting an input power from the wind power generator is provided, and a detection value from the detection unit is input to the control unit. Power conversion equipment.

8. The power conversion device according to any one of claims 3 to 5, The device further includes a timer circuit, and time information from the timer circuit is input to the control unit. Power conversion equipment.

9. The solar power generator, the wind power generator, and the power conversion device according to any one of claims 3 to 5 are included, The switching unit inputs either the power generated by solar power generation or the power generated by wind power generation into the common power conversion circuit. Power generation system.

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