JP5687559B2 - Parallel operation controller for inverter generator - Google Patents

Description

  The present invention relates to an inverter generator parallel operation control device.

  As an inverter generator that generates AC power by converting AC output from a winding wound around a power generation section driven by an engine, using an inverter, for example, the technology described in Patent Document 1 is known. It has been.

Japanese Patent No. 2996542

  This type of inverter generator is configured so that the user can start and stop it by operating appropriate devices such as a remote control switch (remote control box switch). In parallel operation, the user has to start and stop by operating the device for each generator, which is troublesome.

  Accordingly, an object of the present invention is to solve the above-described problems, and when a plurality of inverter generators are operated in parallel, an inverter in which other generators can be started / stopped by a user operating device of one generator The object is to provide a parallel operation control device for a generator.

In order to solve the above-described problem, the invention described in claim 1 is connected to first, second, and third windings wound around a power generation unit driven by an engine, respectively, and the first, second, 2. The AC output from the third winding is DC / AC converted using a switching element to output AC power, and the first, second, and third can operate as a master and the rest as slaves. Controls the inverter and the switching elements of the first, second, and third inverters, and is communicatively connected to each other via CANBUS, and operates as the master when the first inverter operates as a master. The first control unit and the second and third inverters that operate as slaves, the second and third control units, and the first, second, and third inverters respectively connected to the AC output as the U phase, A three-phase output terminal connected in series to a terminal group that outputs as either a phase or a W phase and a neutral terminal of the terminal group, and a parallel connection to the terminal group and a serial connection to the neutral terminal A single-phase output terminal, a switching mechanism that switches between the three-phase output terminal and the single-phase output terminal, a three-phase / single-phase switch that is provided to be freely operated by the user, and controlling the operation of the engine, The output of the changeover switch is communicated to the first, second, and third control units via the CANBUS, and the changeover switch is operated according to the output of the changeover switch so that the three-phase AC and single-phase AC are output. An engine control unit that outputs any one of the first, second, and third control units when the first inverter is operated as a master, and the second, second, and third control units are based on the output of the first inverter. 3 in Together configured as output over motor controls the on-off of the switching element so that the three-phase alternating current or single-phase alternating current corresponding to the output of the changeover switch which is communicated from the engine control unit, the same A parallel operation control device for an inverter generator A that can be operated in parallel with at least one inverter generator B having a configuration, wherein the generator B is operated in response to a start signal sent from a device operated by a user. A parallel activation signal reception standby means for waiting for reception of a parallel activation signal transmitted from the generator B after starting and generating power; and when receiving a parallel activation signal transmitted from the generator B, the engine Engine starting means for starting up, voltage judging means for judging whether or not a parallel output terminal voltage of the generator B is within a predetermined range, and the parallel output terminal When the child voltage is determined to be within a predetermined range, Rutotomoni a power generation start means for starting the power generation, the engine starting means, after the power generation is started by the start of power generation means, from the generator B When the transmitted parallel start signal is not received, the engine is stopped to stop power generation .

The invention according to claim 2 includes frequency determination means for determining whether or not the frequency of the parallel output terminal voltage with the generator B is within a predetermined range, and the power generation start means When it is determined that the frequency is within the predetermined range and the frequency is within the predetermined range, power generation is started.

In the first aspect of the present invention, the first, second, and third windings are respectively connected to the first, second, and third windings that are wound around the power generation unit that is driven by the engine. First, second, and third inverters that can be operated as a master and the rest as slaves, and the first, The first control unit and the second and third inverters that control the switching elements of the second and third inverters and are connected to each other via CANBUS so that the first inverter operates as a master when operating as the master. Are connected to the second and third control units and the first, second, and third inverters, respectively, to output the AC output as any of the U-phase, V-phase, and W-phase. Group neutrality A switch that switches between a three-phase output terminal that is connected in series to each child, a single-phase output terminal that is connected in parallel to a terminal group, and that is connected in series to a neutral terminal, and a three-phase output terminal and a single-phase output terminal The mechanism, a three-phase / single-phase changeover switch provided for user operation, and the engine operation are controlled, and the output of the changeover switch is communicated to the first, second and third control units via CANBUS. An engine control unit that operates the switching mechanism according to the output of the changeover switch to output either three-phase AC or single-phase AC, and the first, second, and third control units master the first inverter. The output of the second and third inverters is switched to a three-phase alternating current or a single-phase alternating current according to the output of the changeover switch communicated from the engine control unit with the output of the first inverter as a reference. Together configured to control the on and off of the device, a parallel operation control unit at least one group of the inverter generator B enables parallel operation inverter generator A having the same configuration, the generator B user A parallel activation signal reception standby means for waiting for reception of a parallel activation signal transmitted from the generator B after starting the engine in response to the activation signal sent from the device to be operated, and transmitting from the generator B Engine start means for starting the engine when the parallel start signal is received, voltage determination means for determining whether the parallel output terminal voltage of the generator B is within a predetermined range, and the parallel output terminal voltage is predetermined. when it is determined to be within range, Rutotomoni a power generation start means for starting the power generation, the engine starting means, after the power generation is started by the power generation start means, the generator B When the parallel start signal transmitted from the mobile station is no longer received, the engine is stopped and the power generation is stopped . Therefore, the user sends the start signal to the generator B via a device operated by the user, for example, a remote control switch. When the generator B is started by sending to the generator B, the generator A is started from the generator B, the operation becomes simple, and the operability can be greatly improved. In addition, since the generator A starts power generation when the parallel output terminal voltage is within a predetermined range, the generator A and the generator B can be reliably operated in parallel without causing malfunction. it can.

Further , the engine starting means is configured to stop the power generation by stopping the engine when the parallel start signal transmitted from the generator B is not received after the power generation is started by the power generation starting means. In addition to the effects described above, if the user stops transmitting the start signal to the generator B via the operation device, the generators A and B are stopped, so that the operation is further simplified and the operability is further improved. be able to. In addition to the effects described above, it is possible to selectively and reliably output a three-phase alternating current and a single-phase alternating current of a desired voltage according to the output of a changeover switch provided for user operation, and the output of the generator Can be fully utilized.

The invention according to claim 2 further comprises frequency determining means for determining whether or not the frequency of the parallel output terminal voltage with the generator B is within a predetermined range, and the power generation starting means is the voltage of the parallel output terminal. Is determined to be within the predetermined range and the frequency is determined to be within the predetermined range, so that power generation is started, so in addition to the effects described above, it is possible to align the voltage and phase of the three-phase output, Therefore, the parallel operation can be performed more reliably without causing the generator A and the generator B to malfunction.

1 is a block diagram generally showing an inverter generator according to an embodiment of the present invention. It is a top view of the crankcase of the engine of the inverter generator of FIG. It is a circuit diagram which shows the structure of the inverter part of the inverter generator of FIG. 1 in detail. It is explanatory drawing explaining operation | movement of the inverter part of the inverter generator of FIG. It is a circuit diagram which shows the structure of the filter part of the inverter generator of FIG. 1 in detail. Similarly, it is a circuit diagram showing in detail the configuration of the filter section of the inverter generator of FIG. It is explanatory drawing which shows operation | movement of the engine control part of the inverter generator of FIG. It is a block diagram which shows more concretely the operation | movement of the control part of the inverter part of the inverter generator of FIG. FIG. 9 is a time chart for explaining a reference signal and a synchronization signal used in the configuration of FIG. 8. FIG. 8 is a time chart showing switching from three-phase output to single-phase output by the operation of FIG. 7. FIG. 8 is a time chart showing switching from single-phase output to three-phase output by the operation of FIG. 7. It is explanatory drawing which shows the case where a plurality (specifically, two) inverter generators shown in FIG. 1 are operated in parallel. It is a flowchart which shows operation | movement of the parallel operation control apparatus which consists of a user's preparatory work in the parallel operation shown in FIG. 12, and an engine control part according to it.

  The best mode for carrying out an inverter generator according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a block diagram generally showing an inverter generator according to an embodiment of the present invention.

  In FIG. 1, the code | symbol 10 is an inverter generator and is corresponded to the generator A or B mentioned later. The inverter generator 10 includes an engine (internal combustion engine) 12 and has a rated output of about 5 kW (50 A at 100 V AC). The engine 12 is a spark ignition type air-cooled engine using gasoline as fuel.

  A throttle valve 12b and a choke valve 12c are disposed in the intake pipe 12a of the engine 12. The throttle valve 12b is connected to a step (throttle) motor 12d. The choke valve 12c is also connected to a choke motor (also comprising a step motor) 12e.

  The engine 12 includes a battery 14 having a capacity of about 12V, and the step motor 12d and the choke motor 12e open and close by driving the throttle valve 12b and the choke valve 12c when energized from the battery 14. The engine 12 includes a power generation unit (shown as “ALT”) 16.

  FIG. 2 is a plan view of the crankcase 12f of the engine 12 shown in FIG.

  As shown in the figure, the power generation unit 16 includes a stator 16a fixed to the crankcase 12f and a rotor 16b that also serves as a flywheel that is rotatably disposed around the stator 16a.

  The stator 16a includes 30 protrusions, 27 of which three sets of three-phase output windings (main windings) 18 composed of U, V, and W phases are wound and Similarly, a set of three-phase output windings (sub-windings) 20 consisting of U, V, and W are wound. Specifically, the three sets of output windings 18 include 18a, 18b, and 18c.

  Inside the rotor 16b arranged outside the stator 16a, a plurality of pairs of permanent magnets 16b1 are alternately attached to the magnetic poles magnetized in the radial direction so as to face the output windings 18 and 20.

  In the power generation unit 16, the permanent magnet of the rotor 16b rotates around the stator 16a, so that the U-phase and V-phase are output from the 27 three-phase output windings 18 (more specifically, 18a, 18b, 18c). The AC power composed of the W phase is output (power generation), and the AC power of each phase is similarly output from the three sub-windings 20.

  Returning to FIG. 1 and continuing the description, the inverter generator 10 according to this embodiment is roughly divided into an output winding 18 wound around the power generation unit 16, an inverter unit (indicated as "INV") 22, , A filter unit (shown as “Filter”) 24, an output unit (shown as “OUT”) 26, an engine control unit (shown as “ECU”) 28, and a control panel unit (shown as “Control Panel”) 30. Is provided. ECU (Electronic Control Unit) means an electronic control unit and includes a CPU as described later.

  As shown in the figure, the characteristic of the inverter generator 10 according to this embodiment is that three sets (three) of single-phase inverter generators are connected in parallel, and three-phase alternating current and single-phase alternating current are output from the output. It is that output can be made simply and selectively.

  That is, the inverter generator 10 includes three sets of windings including first, second, and third output windings 18a, 18b, and 18c connected in parallel, and first, second, and third inverters 22a and 22b. , 22c, an inverter unit 22 including three sets of inverters, a filter unit 24 including three sets of filters from the first, second, and third filters 24a, 24b, and 24c, a three-phase output terminal 26e, and a single unit. An output unit 26 including a phase output terminal 26 f, an engine control unit 28 that controls the operation of the engine 12, and one control panel unit 30 are provided.

  Specifically, the inverter unit 22 and the like are composed of a semiconductor chip mounted on a printed board housed in a case provided at an appropriate position of the engine 12, and the control panel unit 30 It is composed of a semiconductor chip provided at an appropriate position and a panel connected thereto.

  As shown in the figure, the output winding 18, the inverter unit 22, the filter unit 24, and the output unit 26, each having three sets, are connected to each other so that the sets with common suffixes a, b, and c are connected to each other. Configured.

  The first, second, and third inverters 22a, 22b, and 22c constituting the inverter unit 22 are each composed of a single-phase two-wire inverter, and are integrated with FET (field effect transistor) and SCR (thyristor) integrated power. Modules 22a1, 22b1, 22c1, 32-bit CPUs 22a2 (first control unit), 22b2 (second control unit), 22c2 (third control unit), voltage / current sensors for detecting the voltage and current of the power generation output, etc. Various sensors (not shown).

  FIG. 3 is a circuit diagram showing the configuration of the inverter unit 22 in detail. Hereinafter, the group a will be described as an example. However, since the configuration of each group is basically the same, the description of the group a is valid for the groups b and c.

  As shown in FIG. 3, the power module 22a1 includes a mixed bridge circuit 22a11 in which three SCRs (thyristors (switching elements for DC conversion)) and DI (diodes) are bridge-connected, and four FETs (field effect transistors). (Switching element for AC conversion) is configured from an H-bridge circuit 22a12 that is H-bridge connected.

  Three-phase AC power output (generated) from the U-phase terminal 18a1, V-phase terminal 18a2, and W-phase terminal 18a3 of the output winding 18a wound around the power generation unit 16 is input to the corresponding first inverter 22a. In the mixed bridge circuit 22a11 of the power module 22a1, the signal is input to the midpoint of the SCR and DI.

  In the mixed bridge circuit 22a11, the gate of the SCR is connected to the battery 14 via a driver circuit (not shown). Energization (ON, conduction (ignition)) and energization stop (OFF (non-conduction)) from the battery 14 via the driver circuit are controlled by the CPU 22a2.

  That is, the CPU 22a2 conducts (ignites) the SCR gate at a conduction angle (ignition angle) corresponding to the target output voltage based on outputs of various sensors such as a voltage / current sensor, and outputs the output winding 18a. Is converted to a direct current of the output voltage.

  The DC output from the mixing bridge circuit 22a11 is input to the H bridge circuit 22a12 of the FET. In the H-bridge circuit 22a12, the FET is connected to the battery 14, and the energization (ON (conduction)) and energization stop (OFF (non-conduction)) are controlled by the CPU 22a2, so that the input direct current The output is converted into alternating current at a predetermined frequency (for example, a commercial frequency of 50 Hz or 60 Hz).

  FIG. 4 is an explanatory diagram for explaining the operation of the H-bridge circuit 22a12.

  That is, the CPU 22a2 generates and generates a reference sine wave (signal wave, indicated by a solid line at the top) of a predetermined frequency (that is, commercial frequency 50 Hz or 60 Hz) of the target output voltage waveform as shown in FIG. A reference sine wave is input, and a comparator (not shown) is compared with a carrier (for example, a 20 kHz carrier wave) to generate a PWM (Pulse Width Modulation) signal, and an H bridge is generated based on the generated PWM signal. The FET of the circuit 22a12 is turned on / off.

  In FIG. 4, the broken line at the bottom shows the target output voltage waveform. The period T (step) of the PWM signal (PWM waveform) is actually much shorter, but is exaggerated in the figure for convenience of understanding.

  The inverter unit 22 is connected to the filter unit 24.

  The filter unit 24 includes LC filters (low-pass filters) 24a1, 24b1, and 24c1 for removing harmonics and noise filters 24a2, 24b2, and 24c2 for removing noise, and the AC output converted by the inverter unit 22 is an LC filter 24a1. , 24b1, 24c1 and noise filters 24a2, 24b2, 24c2. Harmonics and noise are removed.

  FIG. 5 shows a circuit configuration of the LC filter 24a1, and FIG. 6 shows a circuit configuration of the noise filter 24a2. Although not shown, the circuit configurations of the LC filters 24b1 and 24c1 and the noise filters 24a2, 24b2, and 24c2 are the same.

  The inverter unit 22 is connected to the output unit 26 via the filter unit 24.

  As shown in FIG. 1, the output unit 26 is connected to the first inverter 22a and outputs an AC output as a U phase, and is connected to the second inverter 22b and outputs an AC output as a V phase. Connected in series to a V-phase terminal 26b, a W-phase terminal 26c connected to the third inverter 22c and outputting an AC output as a W-phase, and a neutral O-phase terminal (neutral point) 26d ( A four-phase (three-wire) output terminal 26e is provided.

  Further, the output unit 26 is connected in parallel to the U-phase terminal 26a, the V-phase terminal 26b, and the W-phase terminal 26c, and is connected in series to the O-phase terminal 26d (two wires), a single-phase output terminal 26f, A switching mechanism 26g for switching between the three-phase output terminal 26e and the single-phase output terminal 26f is provided.

  The three-phase output terminal 26e and the single-phase output terminal 26f are connected to the electric load 32 via a connector (not shown) or the like.

  Similarly, the engine control unit 28 includes a 32-bit CPU 28c to control the operation of the engine 12, and the CPUs 22a2, 22b2, and 22c2 of the inverters 22a, 22b, and 22c, a CAN (Control Area Network) BUS (bus) 28a, and a CAN / The CPUs 22a2, 22b2, and 22c2 (first, second, and third control units) are connected to each other through an F (Interface) 28b. The output of the output winding (sub-winding) 20 is supplied to these CPUs 22a2, 22b2, 22c2, and 28c as operating power.

  The engine control unit 28 further includes a starter generator driver (STG DRV) 28d that operates the output winding 18c as a starter (starter) of the engine 12 in addition to the operation as a generator (generator). That is, in this embodiment, the power generation unit 16 is also operated as an electric motor by energizing any one of the output windings 18a, 18b, and 18c (for example, the output winding 18c).

  The starter generator driver 28d includes a DC / DC converter 28d1. As will be described later, the DC / DC converter 28d1 boosts the output of the battery 14, energizes the output winding 18c, and rotates the rotor 16b of the power generation unit 16 relative to the stator 16a in accordance with an instruction from the CPU 28c. Start.

  The engine control unit 28 further includes a TDC detection circuit (not shown) for detecting TDC from an output of a pulsar (not shown) formed of a magnetic pickup disposed between the stator 16a and the rotor 16b, and an output winding 18c. An engine speed detection circuit 28e is connected to the U terminal and detects the speed NE of the engine 12 from its output.

  The engine control unit 28 further drives a communication (COM) I / F 28f, a sensor (Sensor) I / F 28g, a display (DISP) I / F 28h, a SW (switch) I / F 28i, and a step motor 12d. Driver circuit 28j, driver circuit 28k for driving choke motor 12e, and ignition driver circuit 28l for driving an ignition device (not shown).

  The CPU 28c determines the opening degree of the throttle valve 12b so that the target rotational speed is calculated according to the AC output to be supplied to the electric load 32, and supplies it to the step motor 12d via the driver circuit 28j. To control.

  The control panel unit 30 is provided separately from the engine 12 and can be carried around by a user, and a remote (Remote) connected to a remote control box (hereinafter referred to as “remote controller”) 34 wirelessly (or by wire). ) I / F 30a, LED 30b, LCD 30c, KEY switch (main switch) 30d for instructing operation (start) / stop and remote position setting / release of the inverter generator 10 that can be operated by the user, and inverter generator A three-phase / single-phase change-over switch 30e for instructing switching between three-phase alternating current and single-phase alternating current of 10 outputs is provided.

  The remote controller 34 includes a start switch 34a, a stop switch 34b, and a pilot lamp 34c. When the start switch 34a is turned on by the user, an activation signal is transmitted to the engine control unit 28 via a remote I / F 30a. In addition, when the stop switch 34b is turned on, a stop instruction is issued by stopping the transmission of the start signal. The start switch 34a and the stop switch 34b correspond to the above-described remote control switch (device operated by the user (user operation device)).

  The control panel unit 30 and the engine control unit 28 are communicably connected via wireless (or wired), and the engine control unit 28 outputs the outputs of the KEY switch 30d and the changeover switch 30e of the control panel unit 30 to the switch I / F 28i. And controlling blinking of the LED 30b and the LCD 30c of the control panel unit 30 via the display I / F 28h.

FIG. 7 is an explanatory diagram for explaining the operation of the engine control unit 28 .

  Since the three-phase alternating current and the single-phase alternating current of a desired voltage can be selectively output as described above, in this embodiment, the inverter unit 22 includes three sets of single-phase inverters (first, second, The third inverter) 22a, 22b, and 22c, and the CPU 28c of the engine control unit 28 operates the switching mechanism 26g of the output unit 26 in accordance with the output of the changeover switch 30e, thereby causing a three-phase output terminal and a single-phase output terminal. Was switched.

  In this embodiment, in the inverter unit 22, one of the three sets of single-phase inverters 22a, 22b, and 22c, for example, 22a is a master and the rest is a slave, according to communication from the CPU 28c of the engine control unit 28. When the three sets of CPUs 22a2, 22b2, and 22c2 output three-phase alternating current, as shown in the figure, the V-phase and W-phase from the slave-side 26b and 26c are based on the output from the U-phase terminal 26a on the master side. The operation of the inverter unit 22 is controlled so that the phase output shifts the phase by 120 degrees.

  On the other hand, when it is determined that switching to single-phase alternating current is instructed, the CPUs 22a2, 22b2, and 22c2 are based on the output from the U-phase terminal 26a on the master side in response to communication from the CPU 28c. The operation of the inverter unit 22 is controlled so that the V-phase and W-phase outputs from 26c match in phase, and single-phase alternating current is output from the single-phase output terminal 26f.

  FIG. 8 is a block diagram showing the operations of the three CPUs 22a2, 22b2, and 22c2 more specifically, and FIG. 9 is a time chart for explaining the reference signal and the synchronization signal used in the operation of FIG.

As shown in the figure, the CPU 22a2 of the first inverter 22a on the master side includes a reference signal generator 22a21 that generates a reference signal of a predetermined frequency (shown in FIG. 9), and a PWM controller 22a22 that performs PWM control according to the PWM signal of FIG. , Generating synchronization signals 1 and 2 (shown in FIG. 9) for synchronizing the phase of the output on the slave side to that of the master side (having a predetermined phase difference with respect to the reference signal), and transmitting them to the CPUs 22b2 and 22c2. A synchronization signal control unit 22a23 and a communication control unit 22a24 that controls transmission / reception (communication) of a synchronization signal generated via the communication line 22d.

  The second and third inverters 22b and 22c on the slave side also include similar PWM control units 22b22 and 22c22, synchronization signal control units 22b23 and 22c23, and communication control units 22b24 and 22c24, except for the reference signal generation unit. .

When the three-phase alternating current is instructed (switched) via the changeover switch 30e, the synchronization signal control unit 22a23 has a predetermined frequency (FIG. 9A), for example, when the frequency is decreased (FIG. 9A). Even in (b), the synchronization signals 1 and 2 whose phases are always shifted by 120 degrees with respect to the reference signal (in other words, having a predetermined phase difference with respect to the reference signal) are generated and transmitted.

  When it is determined that switching to single-phase alternating current is instructed, the CPU 22a2 communicates with the CPUs 22b2 and 22c2 to output the V-phase and W-phase from 26b and 26c based on the output from the U-phase terminal 26a. Are controlled so as to match in phase, and single-phase alternating current is output from the single-phase output terminal 26f.

That is, the CPU 22a2 generates a reference signal having a predetermined frequency, generates a synchronization signal having a predetermined phase difference (more precisely, the same phase difference ) with respect to the reference signal, and transmits the synchronization signal to the CPUs 22b2 and 22c2. Based on the output from the U-phase terminal 26a, the operation of the inverter unit 22 is controlled so that the V-phase and W-phase outputs from 26b and 26c coincide in phase, and single-phase alternating current is output from the single-phase output terminal 26f.

  FIG. 10 is a waveform diagram showing switching from three-phase to single-phase output in this embodiment, and FIG. 11 is a waveform diagram showing switching in the opposite case. When the user operates the change-over switch 30e of the control panel unit 30, three-phase alternating current and single-phase alternating current with a desired voltage are selectively output as shown in the figure.

  Since the feature of the present invention is that a plurality of the inverter generators 10 are operated in parallel, this will be described below.

  FIG. 12 is an explanatory diagram showing a case where the inverter generator 10 shown in FIG. 1 is operated in parallel as a plurality of generators 10A and 10B (specifically, two generators). In this embodiment, the generator 10B is a master and the generator 10A is a slave. The generators 10 </ b> A and 10 </ b> B are connected by a parallel operation connection cable 36 and are connected by an external connection line 38.

  FIG. 13 is a flowchart showing the operation of the parallel operation control device including the user's preparatory work in the parallel operation shown in FIG. 12 and the engine control units of the generators 10A and 10B corresponding thereto.

  In the generator 10B (master machine), in S (step) 10, the KEY switch 30d is set to the remote position by the user, and the process starts. The remote position means a state in which the generator 10B can be operated by the remote controller 34.

  Next, when the user turns on the start switch 34a of the remote controller 34 in S12, the operation is transmitted to the engine control unit 28 of the generator 10B via the remote I / F 30a, and the CPU 28c of the engine control unit 28 in S14. Starts the engine 12. As a result, the generator 10B starts power generation in S16.

  Next, in S <b> 18, the generator 10 </ b> B generates a parallel activation signal and transmits it to the generator 10 </ b> A via the external communication line 38.

  On the other hand, even in the generator 10A (slave machine), the key switch 30d is set to the remote position by the user in S100, and the process starts.

  Next, the generator 10A waits for reception of the parallel activation signal from the generator 10B in S102, and when received, proceeds to S104, and starts the engine 12 of the generator 10A.

Next, in S106, the CPU 28c of the engine control unit 28 of the generator 10A determines whether or not the parallel output terminal voltage of the parallel operation connection cable 36 is within a predetermined range, that is, an output voltage that can be operated in parallel. When the result in S106 is negative, the program proceeds to S108, and the engine 12 of the generator 10A is stopped.

  On the other hand, when the result in S106 is affirmative, the process proceeds to S110, where the parallel output terminal voltage frequency of the parallel operation connection cable 36 is within the predetermined range, that is, when the operation is performed with the three-phase output as shown in FIG. It is determined whether or not the phase of the voltage frequency matches.

  When the result in S110 is negative, the process proceeds to S108, while when the result is affirmed, the process proceeds to S112, and the CPU 28c of the engine control unit 28 of the generator 10A starts power generation.

Next, in S114, CPU28c generator 10A of the engine control unit 28 repeatedly determines whether or not the parallel activation signal from the generator 10B continues to be received, the process proceeds to S108. When the result is not a constant, the engine of the generator 10A 12 is stopped.

As described above, in the parallel operation control device for the inverter generator 10 of this embodiment, the first, second, and third windings (output windings) wound around the power generation unit 16 driven by the engine 12. 18a, 18b, 18c) are connected to each other, and the alternating current output from the first, second, and third windings is converted into direct current / alternating current using a switching element to output alternating current power. The remaining first, second and third inverters 22a, 22b and 22c operable as slaves and the switching elements of the first, second and third inverters are controlled, and the CANBUS 28a can communicate with each other. When connected (external connection line 38) and operating the first inverter as the master, the first control unit (CPU 22a2) operating as the master and the second and third inverters Are connected to the second and third control units (CPUs 22b2 and 22c2) and the first, second and third inverters, respectively, and the AC output is any one of the U phase, V phase and W phase. A three-phase output terminal 26e connected in series to the terminal group 26a, 26b, 26c and the neutral terminal 26d of the terminal group, respectively, connected in parallel to the terminal group, and connected in series to the neutral terminal A single-phase output terminal 26f, a switching mechanism 26g for switching between the three-phase output terminal and the single-phase output terminal, a three-phase / single-phase selector switch 30h provided for user operation, and the operation of the engine 12. And controlling the output of the changeover switch 30h to the first, second, and third control units via the CANBUS 28a, and controlling the output according to the output of the changeover switch 30h. And an engine control unit 28 that operates the switching mechanism 26g to output either the three-phase AC or the single-phase AC, and the first, second, and third control units operate using the first inverter as a master. The output of the second and third inverters is based on the output of the first inverter as a reference so that the output of the changeover switch communicated from the engine control unit becomes a three-phase AC or a single-phase AC A parallel operation control device for an inverter generator A (10A) configured to control on / off of a switching element and capable of operating in parallel with at least one inverter generator B (10B) having the same configuration. The generator B is operated by a device operated by a user (a remote control switch of the remote control 34 (start switch 34a, stop switch 34b)). From the generator 10B, parallel start signal reception waiting means (S102) for waiting for reception of the parallel start signal transmitted from the generator B after starting the engine 12 in response to the start signal sent and starting power generation Whether the parallel output terminal voltage (of the parallel operation connection cable 36) between the engine starting means (S104) for starting the engine 12 and the generator B is within a predetermined range when the parallel start signal to be transmitted is received and whether judges voltage determining means (S106), when the parallel output terminal voltage is determined to be within a predetermined range, and a power generation start means for starting the power generation (S112) Rutotomoni, said engine starting means ( S104) is when the parallel start signal transmitted from the generator 10B is not received after the power generation is started by the power generation start means (S112). Since it is configured as to stop the power generation is stopped the engine 12, the user the user operating device, for example if starting the generator 10B sends a start signal to the generator 10B via the start switch 34a of the remote controller 34, the generator The generator 10A is started from the machine 10B, the operation is simplified, and the operability can be greatly improved. Further, since the generator 10A starts power generation when the parallel output terminal voltage is within the predetermined range, the generators 10A and 10B can be reliably operated in parallel without causing malfunction.

  The engine starting means (S104) stops the engine 12 when the parallel start signal transmitted from the generator 10B is not received after the power generation is started by the power generation start means (S112). In addition to the above-described effects, the user can stop the generator 10A, if the user stops transmitting the start signal to the generator 10B via the stop switch 34b of the user operation device, for example, the remote controller 34. 10B is stopped, so that the operation is further simplified and the operability can be further improved.

In addition, it comprises frequency determining means (S 110 ) for determining whether or not the frequency of the parallel output terminal voltage with the generator 10B is within a predetermined range, and the power generation start means (S30) Since it is configured to start power generation when it is determined that the frequency is within the predetermined range, in addition to the effects described above, it is possible to align the voltage and phase of the three-phase output, Therefore, the generators 10A and 10B can be more reliably operated in parallel without causing malfunction.

  The generator 10A is connected to first, second, and third windings (output windings 18a, 18b, and 18c) wound around a power generation unit 16 driven by the engine 12, respectively. First, second, and third inverters 22a, 22b, and 22c that convert alternating current output from the first, second, and third windings into direct current / alternating current using a switching element to output alternating current power; and A first control unit (CPU 22a2) that controls the switching elements of the first, second, and third inverters and that is connected to be communicable with each other (external connection line 38) and operates the first inverter as a master; Second and third control units (CPUs 22b2 and 22c2) that operate with the second and third inverters as slaves and the first, second, and third inverters, respectively, are connected to the AC output. A three-phase output terminal 26e connected in series to a terminal group 26a, 26b, 26c that outputs as one of the V-phase and W-phase and a neutral terminal 26d of the terminal group, and a parallel connection to the terminal group In addition, a single-phase output terminal 26f connected in series to the neutral terminal, a switching mechanism 26g that switches between the three-phase output terminal and the single-phase output terminal, and a three-phase / single-phase changeover switch that can be operated by the user 30h and the operation of the engine 12, and the output of the changeover switch 30h is communicated to the first, second and third control units, and the changeover mechanism 26g is operated according to the output of the changeover switch 30h. And an engine control unit 28 that outputs either the three-phase alternating current or the single-phase alternating current, and the first, second, and third control units are based on the output of the first inverter. The on-off state of the switching element is controlled so that the output of the second and third inverters becomes a three-phase alternating current or a single-phase alternating current according to the output of the changeover switch communicated from the engine control unit. Therefore, in addition to the effects described above, it is possible to selectively and reliably output a three-phase alternating current and a single-phase alternating current of a desired voltage according to the output of the changeover switch (operable by a user or the like). Moreover, since it comprised so that a single phase output terminal might be connected in parallel to the terminal group which comprises a three-phase output terminal, the output of generator 10A (or 10B) can fully be utilized.

  In the above description, the case where two inverter generators are operated in parallel has been disclosed. However, the present invention is not limited to this, and the present invention is applicable to the case where three or more inverter generators are operated in parallel.

  Moreover, although what provided three sets of inverters as an inverter generator was disclosed, it is not restricted to this, This invention produces | generates alternating current power based on the output of the coil | winding wound by the electric power generation part driven with an engine. Any generator may be used as long as it has an inverter.

  10, 10A, 10B Inverter generator, 12 engine (internal combustion engine), 14 battery, 16 power generation unit, 16a stator, 16b rotor, 18 output winding (main winding, winding) 18a first winding, 18b second Winding, 18c 3rd winding, 20 output winding (sub-winding), 22 inverter section, 22a first inverter, 22a1 power module, 22a2 CPU (first control section), 22b second inverter, 22b1 power module, 22b2 CPU (second control unit), 22c third inverter, 22c1 power module, 22c2 CPU (third control unit), 24 filter unit (filter), 26 output unit, 26a U-phase terminal, 26b V-phase terminal, 26c W Phase terminal, 26d O-phase terminal, 26e Three-phase output terminal, 26f Single-phase output terminal, 26g Switching mechanism, 28 engine control unit, 28c CPU, 30 control panel unit, 30d KEY switch, 30e changeover switch, 32 load (electric load), 34 remote control box (remote control), 34a start switch (device operated by user) 34b Stop switch (device operated by the user) 34c Pilot lamp 36 Connection cable for parallel operation

Claims (2)

The AC output from the first, second, and third windings is connected to the first, second, and third windings wound around the power generation unit that is driven by the engine. / AC conversion and AC power is output, and the first, second, and third inverters that can operate as a master and the rest as slaves, and the switching elements of the first, second, and third inverters A first control unit that operates as the master and the second and third inverters operate as slaves when the first inverter is operated as a master and is connected to each other via CANBUS. 2, a terminal group connected to each of the third control unit and the first, second, and third inverters to output the AC output as one of the U phase, the V phase, and the W phase, and the terminal group A three-phase output terminal connected in series to the neutral terminal, a single-phase output terminal connected in parallel to the terminal group and connected in series to the neutral terminal, the three-phase output terminal and the single-phase output terminal And a three-phase / single-phase selector switch provided for user operation, and controls the operation of the engine, and outputs the selector switch to the first, second, and third control units. An engine control unit that communicates via the CANBUS and operates the switching mechanism according to the output of the changeover switch to output either the three-phase alternating current or the single-phase alternating current, and the first and second When the third control unit operates with the first inverter as a master, the output of the second and third inverters is communicated from the engine control unit based on the output of the first inverter. Together with the way the three-phase alternating current or single-phase alternating current corresponding to the output of the switch configured to control the on and off of the switching elements, and possible parallel operation of at least 1 group inverter generator B of the same configuration A parallel operation control device for an inverter generator A, which is transmitted from the generator B after the generator B starts starting power generation in response to a start signal sent from a device operated by a user. Parallel start signal reception waiting means for waiting for reception of the parallel start signal, engine start means for starting the engine when the parallel start signal transmitted from the generator B is received, and the generator B in parallel Voltage determination means for determining whether or not the output terminal voltage is within a predetermined range, and when it is determined that the parallel output terminal voltage is within the predetermined range, power generation is started. Rutotomoni a power generation start means that the engine starting means, after the power generation is started by the power generation start means, when the parallel activation signal transmitted from the generator B is not received, stops the engine A parallel operation control device for an inverter generator, characterized in that power generation is stopped .   Frequency determining means for determining whether or not the frequency of the parallel output terminal voltage with the generator B is within a predetermined range, and the power generation start means has the parallel output terminal voltage within a predetermined range and the frequency 2. The inverter generator parallel operation control device according to claim 1, wherein power generation is started when it is determined that is within a predetermined range.