JP2017212827A - Radio communication device and power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication device of a simple configuration, in which a fixed body and a rotor, rotatable at high speed, communicate with high quality in a closed space formed of a metal etc.SOLUTION: A radio communication device includes: a fixed body; a substantially cylindrical rotor which rotates around a revolving shaft attached to the fixed body; a fixed side communication unit installed on the fixed body; and a rotary side communication unit installed on the rotor. The rotary side communication unit includes: a receiver unit which receives a radio signal from the fixed side communication unit to amplify the received signal by a variable gain amplifier; and a signal processing unit which acquires a control voltage, corresponding to an angle equivalent to the rotational angle of the rotor, from a recording unit which holds in advance correspondence between a plurality of angles and a plurality of control voltages, so as to control the variable gain amplifier.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless communication device and a power generation system.

  Efforts to use renewable energy are increasing year by year for reducing CO2 emissions, one of the causative agents of global warming, and for stable energy supply. In particular, wind power generation is attracting attention from the viewpoints of environmental compatibility and profitability. Among them, the introduction of offshore wind turbines is expected to increase in the future in order to increase the scale and stabilize the air volume. However, compared with a land windmill, an offshore windmill has the subject that maintenance cost increases even if it is the same maintenance content.

  Below, the example of the conventional wind power generation system 301 using the alternating current excitation generator (Double-Fed Generator: DFG) shown in FIG. 14 is demonstrated. The wind power generation system 301 receives a wind, rotates a rotor 305 via a rotating shaft 302, a generator 307 that sends generated power to an electric power system 309, and excites the rotor 305 of the generator 307 at a variable frequency. The power converter 308 is provided.

  Excitation power to the generator 307 is supplied by bringing the brush 304 into physical contact with the rotor 305. The power converter 308 is configured by, for example, a power device that operates at several kV, and a control signal to the power converter 308 is sent from the controller 311 via an insulating element 310b such as a photocoupler. These control signals are generated by the controller 311 based on the sensor signals from the power converter 308 and the like, and the insulating element 310a is similarly used to transmit these sensor signals.

  In addition to the sensor signal from the power converter 308 and the like, the controller 311 also uses the rotation speed information of the rotor 305 detected by the tachometer 312 to generate a control signal. The power converter 308 is configured by a three-phase inverter and a three-phase converter, and thus has twelve power devices (2 per unit × 3 phases × 2).

  In the power converter 308, the power supplied from the system is AC / DC converted by the six power devices in accordance with the control signal, and further DC / AC converted by the six power devices to the rotor 305 of the generator 307. Supply excitation power. Since this power device requires real-time control on the order of microseconds, low delay of the control signal is also important.

  In the wind power generation system 301, power having a system frequency is supplied from the stator 306 of the generator 307 that is variable in speed. Therefore, the power converter 308 excites the rotor 305 in accordance with the slip frequency (slip which is the difference between the rotation frequency of the generator 307 and the system frequency) via the brush 304, so that the frequency of the stator 306 Control to generate a synchronized rotating magnetic field.

  Thus, the frequency control of the power converter 308 enables variable speed operation with respect to wind speed fluctuations, and wind energy in a wide wind speed range can be converted into electric power. Such a system is technically proven in a variable speed hydroelectric power generation system, and the capacity of the power converter 308 required for variable speed operation may be about 30% of the capacity of the rotating machine, so that the power conversion loss is small, A highly efficient and low-cost power generation system can be realized.

  However, the brush 304 is necessary for power supply to the rotor 305, and replacement and removal of wear debris are required in about one year due to wear of the brush 304. On the other hand, for example, Patent Document 1 describes an AC excitation generator that does not use a brush for the purpose of providing a rotary generator that can improve power generation efficiency while facilitating maintenance.

  In Patent Document 1, a rotary exciter and a power converter are provided on the same shaft as the AC excitation generator, and the power of the system is energized to the stator of the rotary exciter, and power is supplied to the rotor by the principle of the synchronous generator. After that, it is disclosed that power converted in voltage and frequency by a power converter is supplied to a rotor of an AC excitation synchronous generator to perform power generation operation.

  According to this configuration, since the power converter is attached to the rotor, the power converter also rotates as the rotor rotates. This power converter requires control according to the rotation of the windmill, system voltage, current, and the like. Patent Document 1 uses wireless communication so that control signals and various information can be received from the outside without brushing. It is described.

  On the other hand, for example, Patent Document 2 discloses the details of the wireless communication technology performed between the rotating body and the fixed body. In order to perform wireless communication when the transmission device attached to the fixed body and the reception device attached to the rotating body face each other during rotational movement, wireless communication by a pair of transmission device and reception device, It is described that interference due to wireless communication between another pair of transmission apparatuses and reception apparatuses is suppressed. Note that whether or not the transmission device and the reception device face each other is determined based on position information sent from the transmission device.

  In addition, in a wireless communication apparatus used in a mobile communication system such as a mobile phone, the received signal strength of a wireless signal varies within a range of several tens dB due to the influence of fading or the like. For this reason, an automatic gain control (AGC) circuit is used in the reception system of this type of apparatus in order to maintain good reception sensitivity regardless of the received signal strength at the antenna.

  Patent Document 3 discloses the following as an example of such an AGC circuit configuration. The intermediate frequency band received signal output from the radio circuit is adjusted in voltage level by a variable gain amplifier (VGA) and then branched into two and input to a quadrature detection multiplier. Each of these multipliers multiplies the received intermediate frequency received signal by a local oscillation signal having a phase difference of π / 2 generated by the local oscillator and the π / 2 phase shifter. Thus, a baseband received signal is obtained.

  Each of these baseband received signals is input to the VGA after unnecessary wave components are removed by a low pass filter (LPF), and the voltage level is controlled here and then input to the power detection circuit. The The power detection circuit detects the received power of the input baseband received signal, generates a gain control signal according to the detected value, and variably controls the gain of each VGA.

  In the power detection circuit, a baseband received signal is sampled multiple times per symbol by an analog-to-digital converter (ADC) and converted into a digital signal and input to the power detector. The power detector obtains instantaneous signal power by performing a sum of squares operation using the digitized baseband received signal. The detected signal power is input to the difference circuit, where a difference from the reference value is detected. Then, the detected difference value is averaged by an averaging circuit, thereby being supplied as a gain control signal to the VGA.

  Further, in Patent Document 4, in a communication device using radio waves between a rotating body and a fixed body, a fixed body communication device is connected to a plurality of fixed body antennas, and the rotating body communication device is at least one rotating body. The fixed body antenna and the rotating body antenna are arranged so as to face each other, the rotating body communication device includes a signal strength detection unit that detects the strength of the received signal, and the fixed body communication device is Controlling the phase angle adjusting unit for increasing / decreasing the phase angle of the transmission signal by the phase shift amount and the phase angle adjusting unit for increasing / decreasing the amount by the phase shift amount so that the received signal strength of the communication device for a rotating body becomes a predetermined value or more. It is described that a phase angle control unit and a distribution / synthesis unit that distributes and combines signals are provided.

JP 2013-110801 A JP 2012-216854 A Japanese Patent Laid-Open No. 9-307380 International Publication No. 2014/118901

  In order to increase the efficiency and reliability of the AC excitation generator described in Patent Document 1, it is important to improve the quality of wireless communication used as non-contact communication means with the power converter. In particular, in order to improve the power generation efficiency, it is necessary to perform feedback control in real time, and it is necessary to perform wireless communication of a control signal and a sensor signal with low delay, but there is no description of the technology related to these.

  In general, since the generator is protected by a metal casing, wireless communication is performed in a closed space rather than an open space as implicitly assumed in Patent Document 2. In such radio wave propagation in a closed space, a standing wave is generated as a result of the combination of a plurality of reflected waves, so that the signal intensity varies due to rotational displacement. Since the communication error rate increases when the signal strength is reduced, it is necessary to retransmit the signal, and the communication delay until the communication is successful increases.

  Further, in the AGC circuit technique described in Patent Document 3, it takes time for the signals to be averaged during the generation of the gain control signal. Therefore, when the received signal strength varies slowly over time, that is, wireless When the moving speed of the communication device is low, the gain control of the VGA can follow the fluctuation of the received signal strength, and the output power of the VGA can be made almost constant.

  However, if the rotational speed of the generator rotor is increased to 1500 rpm (rotation / minute), the moving speed at a distance of 1.5 m from the rotation axis is about 850 km / h. Compared to mobile communication systems such as mobile phones, the wireless communication system in the generator has a higher moving speed, and the received signal strength fluctuates at a high speed, which may prevent VGA gain control from following.

  Furthermore, since the communication apparatus described in Patent Document 4 is controlled on the transmission side, the configuration may be complicated.

  An object of the present invention is to provide a wireless communication device in which a fixed body and a rotating body capable of high-speed rotation communicate with high quality with a simple configuration in a closed space formed of metal or the like in view of the above points. And

  A representative wireless communication apparatus according to the present invention includes a fixed body, a substantially cylindrical rotating body that rotates around a rotation shaft attached to the fixed body, and a fixed-side communication unit installed on the fixed body. A rotation-side communication unit installed in the rotating body, wherein the rotation-side communication unit receives a radio signal from the fixed-side communication unit, and variable-gains the received signal. A control voltage corresponding to an angle corresponding to a rotation angle of the rotating body is acquired from a receiving unit that amplifies by an amplifier and a recording unit that holds in advance correspondence between a plurality of angles and a plurality of control voltages, and the variable And a signal processing unit for controlling the gain amplifier.

  According to the present invention, it is possible to provide a wireless communication apparatus in which a fixed body and a rotating body capable of high-speed rotation communicate with high quality with a simple configuration in a closed space formed of metal or the like.

It is a block diagram which shows the example of a radio | wireless communication apparatus. It is a block diagram which shows the example of a rotation side controller. It is a block diagram which shows the example of a sensor information processor. It is a block diagram showing an example of a fixed side controller. It is a flowchart which shows the operation example of a radio | wireless communication apparatus. It is a block diagram which shows the example of a power converter. 1 is a block diagram illustrating an example of an antenna of a wireless communication apparatus according to Embodiment 1. FIG. It is a figure which shows the example of the wind power generation system using a radio | wireless communication apparatus. FIG. 6 is a block diagram illustrating an example of a receiving unit and a signal processing unit according to a second embodiment. 9 is a flowchart illustrating an operation example of a wireless communication apparatus according to a second embodiment. 6 is a flowchart illustrating an initial operation example of the wireless communication apparatus according to the second embodiment. FIG. 9 is a block diagram illustrating an example of a wireless communication apparatus according to a third embodiment. FIG. 10 is a block diagram illustrating an example of a fixed-side controller according to a third embodiment. FIG. 10 is a block diagram illustrating an example of a wireless communication apparatus according to a fourth embodiment. FIG. 10 is a block diagram illustrating an example of an antenna of a wireless communication apparatus according to a fourth embodiment. It is a figure which shows the example of the conventional wind power generation system using an alternating current excitation generator.

(A. Overview)
In the following embodiments, when necessary for the sake of convenience, the description will be divided into a plurality of sections or embodiments. However, unless otherwise specified, they are not irrelevant to each other, and one is the other. There are some or all of the modifications, details, supplementary explanations, and the like.

  Further, in the following embodiments, when referring to the number of elements (including the number, numerical value, quantity, range, etc.), especially when clearly indicated and when clearly limited to a specific number in principle, etc. Except, it is not limited to the specific number, and may be more or less than the specific number. Further, in the following embodiments, the constituent elements (including element steps and the like) are not necessarily indispensable unless otherwise specified and apparently essential in principle. Needless to say.

  Similarly, in the following embodiments, when referring to the shapes, positional relationships, etc. of the components, etc., the shapes are substantially the same unless otherwise specified, or otherwise apparent in principle. And the like are included. The same applies to the above numerical values and ranges. In all the drawings for explaining the following embodiments, components having the same structure are denoted by the same reference numerals in principle, and repeated description thereof is omitted.

  An example of a typical example of the present embodiment is as follows.

  A fixed member, a rotating member electrically insulated from the fixed member, a plurality of sensors and a plurality of power devices, and the voltage and frequency are converted based on the control signal based on the power supplied from the power system. Based on information obtained from a power converter that supplies power to a rotating member, a tachometer that measures rotation information such as the rotation angle, rotation speed, and rotation acceleration of the rotating member, and a plurality of sensors and tachometers, A controller that generates a control signal and controls on / off of the plurality of power devices of the power converter by the control signal is provided. The controller is separated as a stationary controller and a rotating controller on the stationary member side and the rotating member side, respectively. The fixed controller, the rotation controller, and the sensor each have a wireless communication unit, and the wireless communication unit is a VG A VGA control unit that outputs a control voltage to the VGA and controls a gain of the VGA, and a recording unit that holds a correspondence between the rotation angle of the rotating member and the VGA control voltage, and from rotation information from the tachometer The VGA control unit controls the VGA according to the association of the recording units, and adjusts the intensity of the received signal of the wireless communication unit.

(B. Embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  Hereinafter, the wireless communication apparatus according to the first embodiment will be described with reference to FIGS.

(1) Power Generation System Hereinafter, the case of a wind power generation system will be described as an example. However, the present embodiment is not limited to this, and may be a power generation system such as hydraulic power, thermal power, and lift.

  FIG. 6 is a diagram illustrating an example of a wind power generation system 321 including a wireless communication device. In addition, about a well-known electric power generation system, it describes in patent documents 1, 4 grade | etc., For example. A main generator 324 having a rotor 322 and a stator 323 is connected to an auxiliary generator 327 including a rotor 325 and a stator 326 via a power converter 104. The electric power of the electric power system 309 is supplied to the stator 326 of the auxiliary generator 327, and the electric power is supplied to the rotor 325 according to the principle of the synchronous generator.

  The rotor 322 and the rotor 325 are fixed to a common shaft and rotate together with the common shaft. The rotating shaft 302 is a part of a common shaft. By rotating with a common shaft, it is guaranteed to rotate on the same axis and at the same speed, and the power converter 104 arranged on the rotors 322 and 325 or the shaft is connected to both the rotors 322 and 325. Does not rotate relatively.

  The winding of the stator 323 of the main generator 324 and the winding of the stator 326 of the auxiliary generator 327 are connected to the power system 309. Since an alternating current having a commercial frequency flows through the power system 309, the voltage changes with time, and the rotor 325 of the auxiliary generator 327 for excitation rotates, so that the inside of the winding of the rotor 325 An induced current corresponding to the rotational speed is generated. The excitation current of the main generator 324 flows to the rotor 322 due to the induced current generated by the rotation of the rotor 325.

  Further, in order to generate predetermined power constantly, even if the rotor 322 of the main generator 324 is rotating at a rotational speed different from the synchronous speed, the rotating magnetic field generated in the rotor 322 of the main generator 324 is generated. The rotation speed is made equal to the system frequency. For this reason, the system synchronization of the rotational speed of the rotating magnetic field is performed by supplying a current having a frequency component corresponding to the slip frequency from the rotor 325 of the auxiliary generator 327 to the rotor 322 of the main generator 324 through the power converter 104. Supply.

  Note that when the slip frequency is negative, the current flow is opposite to that of the positive slip frequency current. That is, system synchronization is realized by supplying a current having a frequency component corresponding to the absolute value of the slip frequency from the rotor 322 of the main generator 324 to the rotor 325 of the auxiliary generator 327 through the power converter 104. The In the power converter 104, the supplied power is AC / DC converted by a power device in accordance with a control signal from the fixed controller 101, and further DC / AC converted by another power device.

  The fixed-side controller 101 receives information such as current values and voltage values between the rotors 322 and 325 obtained from a plurality of sensors described later, and rotation speed information of the rotors 322 and 325 detected by the tachometer 312. The power device of the power converter 104 is controlled by the control signal generated based on the control signal. In accordance with this control, the power converter 104 outputs a current obtained by converting voltage and frequency.

  In this way, system synchronization of the rotational speed of the rotating magnetic field is realized, whereby the wind energy received by the blade 303 can be converted into electric energy by the wind power generation system 321 and transmitted to the power system 309. .

  In this configuration, since the power converter 104 is wired to the rotors 322 and 325, the power converter 104 also rotates as the rotors 322 and 325 rotate. Since the power converter 104 is controlled by the brushless wireless communication from the fixed controller 101, the power converter 104, the rotation controller 102 that rotates together with the power converter 104, and the sensor information processor 103 constitute a rotation unit. The

  Further, the fixed side unit is configured by the tachometer 312 that detects the rotation angle of the rotary shaft 302 rotated by the wind force received by the blade 303 and the fixed side controller 101. The angle information detected by the tachometer 312 is transmitted to the rotation controller 102 and the sensor information processor 103 as rotation angle information (reference rotation angle information) and rotation speed information by the fixed controller 101.

  Sensor information such as a current value and a voltage value between the rotors 322 and 325 is obtained from a sensor in the power converter 104 and transmitted to the fixed controller 101 by the sensor information processor 103. As described above, the fixed unit and the rotating unit constitute a wireless communication device. The power converter 104 may be provided with a breaker in parallel. Thereby, the power converter 104 can be protected from excessive electric power applied at the time of a system failure. Further, a speed increaser may be added to the wind power generation system 321.

(2) Configuration of Radio Communication Device FIG. 1 is a block diagram illustrating an example of a radio communication device. Hereinafter, an example of frequency-multiplexed full-duplex communication using a direct conversion receiver will be described as a wireless communication circuit. The wireless communication apparatus includes a fixed-side unit having a fixed-side controller 101 and a tachometer 312 attached to a fixing member such as a housing of a generator, a rotating-side controller 102 attached to the rotating member, a sensor information processor 103, and A rotary unit having a power converter 104 is provided.

  The power converter 104 includes twelve power devices, six current sensors, and one voltage sensor, details of which will be described later. The fixed-side controller 101 controls the power device of the power converter 104 by generating a control signal based on information such as current values and voltage values obtained from the six current sensors and one voltage sensor.

  The fixed controller 101 includes a signal synthesizer / distributor 1, a transmitter 2, a receiver 3, a signal generator 4, a signal processor 5, and an ADC 6. The receiving unit 3 receives a packetized signal including voltage and current information (hereinafter referred to as a voltage / current packet signal) and outputs it to the signal processing unit 5. The signal processing unit 5 extracts voltage and current information from the voltage / current packet signal and sends it to the signal generation unit 4. Further, the signal generation unit 4 receives the angle information of the rotors 322 and 325 detected by the tachometer 312 after being analog / digital converted by the ADC 6.

  The signal generation unit 4 is configured to control each power device of the power converter 104 based on the above information and information that is not illustrated and is set in advance, such as the frequency of the power system, which is a PWM (Pulse Width Modulation). ) Generate pulse waveform information, that is, PWM information. The combination of the PWM information is not particularly limited as long as the information represents the waveform of the PWM pulse, such as a pulse rise time and a fall time, a rise time and a pulse width, and a duty ratio.

  The signal generation unit 4 sends a packetized signal (hereinafter referred to as a PWM packet signal) including the PWM information and the rotation angle information and rotation speed information of the rotors 322 and 325 to the transmission unit 2. The transmission unit 2 superimposes a PWM packet signal specific to each power device on 12 radio carriers having different frequencies, and transmits the superimposed signal to each of the rotation-side controllers 102.

  Further, the signal generation unit 4 sends a signal (hereinafter referred to as a rotation angle packet signal) in which the rotation angle information and the rotation speed information of the rotors 322 and 325 are packetized to the transmission unit 2. The transmission unit 2 superimposes on a radio carrier having a frequency different from the twelve frequencies and transmits it to the sensor information processor 103. The signal combiner / distributor 1 bundles the signal output from the transmitter 2 and the signal input to the receiver 3, and may be a literal combiner / distributor or a duplexer. .

  Each of the twelve rotation-side controllers 102 is connected to each of the twelve power devices in the power converter 104, and includes a reception unit 11 a, a signal processing unit 12 a, and a gate driver 13. Is insulated. The receiving unit 11a of the rotation-side controller 102 selects and receives the PWM packet signal for the connected power device from the PWM packet signals transmitted from the fixed-side controller 101 based on the frequency of the wireless carrier.

  The signal processing unit 12a of the rotation-side controller 102 extracts PWM information from the received PWM packet signal and sends it to the gate driver 13, extracts rotation angle information and rotation speed information from the received PWM packet signal, and converts them into gain information. And control the gain of reception.

  The sensor information processor 103 is connected to six current sensors and one voltage sensor in the power converter 104, and includes a signal synthesizer / distributor 31, a receiver 11b, a signal processor 12b, a transmitter 15, and a signal generator. 16 and ADC 36. The signal combiner / distributor 31 bundles the signal output from the transmitter 15 and the signal input to the receiver 11b, and may literally be a combiner / distributor or a duplexer.

The rotation angle packet signal transmitted from the fixed-side controller 101 and passed through the signal synthesizer / distributor 31 is received by the receiving unit 11b and output to the signal processing unit 12b. Since the receiving unit 11b and the signal processing unit 12b are the same as the receiving unit 11a and the signal processing unit 12a described in the rotation-side controller 102, description thereof is omitted. (Hereinafter, when the receiving unit 11a and the receiving unit 11b are expressed without distinction, they are expressed as the receiving unit 11, and other symbols are also expressed in the same manner.)
The ADC 36 receives the voltage and current information, converts it into a digital signal, and sends it to the signal generator 16. The signal generator 16 packetizes the voltage / current information into a voltage / current packet signal at the timing of receiving the rotation angle packet signal, and sends the packet to the transmitter 15. The transmission unit 15 transmits the signal as a wireless signal to the fixed controller 101 via the signal synthesis / distributor 31.

  FIG. 2A is a block diagram illustrating an example of the rotation-side controller 102. The receiving unit 11a includes an LNA 21a, a mixer 22a, an LPF 23a, a VGA 24a, an ADC 25a, and a DAC 26a. The LNA 21a is a low noise amplifier (LNA) that amplifies a radio signal mixed with 12 PWM packet signals sent from the fixed-side controller 101 and outputs the amplified signal to the mixer 22a.

  A local oscillator (not shown) is connected to the mixer 22a. This local oscillator is set to oscillate at the frequency of the wireless carrier on which the PWM packet signal unique to each power device is superimposed. As a result, the mixer 22a down-converts the radio signal received from the LNA 21a and outputs the baseband signal to the LPF 23a. The LPF 23a extracts only the PWM packet signal specific to each power device from the baseband signal mixed with each PWM packet signal, and outputs it to the VGA 24a.

  The VGA 24a amplifies the PWM packet signal received from the LPF 23a with a gain value set by the DAC 26a described below, and outputs the amplified PWM packet signal to the ADC 25a. The ADC 25 a performs analog / digital conversion on the PWM packet signal received from the VGA 24 a, and outputs the analog signal to the signal processing unit 12.

  The signal processing unit 12a includes a packet processing unit 28a, a VGA control unit 29a, and a table 30a. The packet processing unit 28a calculates the current rotation angle of the rotors 322 and 325 from the rotation angle information or rotation speed information included in the PWM packet signal sent from the fixed-side controller 101 and the internal counter, and the VGA control unit 29a Send to.

  The table 30 holds a comparison table of the rotation angle and the VGA control voltage. The VGA control unit 29a reads the VGA control voltage corresponding to the rotation angle received from the packet processing unit 28a from the table 30, and reads the read VGA. The control voltage is converted by the DAC 26a and set to the VGA 24a. Here, the DAC 26a is a digital-to-analog converter (DAC), and converts a digital signal into an analog signal.

  The packet processing unit 28a of the signal processing unit 12a detects the presence or absence of a signal error using an error detection code such as CRC (Cyclic Redundancy Check) included in the PWM packet signal. When a signal error is detected, the packet processing unit 28a sends a signal to turn off the gate to the gate driver 13 to forcibly turn off the power device to prevent the two power devices constituting the inverter from being turned on simultaneously. .

  If no signal error is detected, the packet processing unit 28a extracts PWM information from the PWM packet signal, restores the PWM pulse, and sends it to the gate driver 13. Based on the received PWM pulse, the gate driver 13 generates a current and a voltage for turning on / off the power device, and sends the generated current and voltage to the power device in the power converter 104.

  In this example, the gain is controlled by using an amplifier that amplifies the baseband signal as a variable gain, that is, VGA 24a. However, the gain may be controlled using the LNA 21a as a variable gain, or both the VGA 24a and the variable gain LNA 21a may be combined. The gain may be controlled. The packet processing unit 28a may correct the communication delay measured or calculated in advance and calculate the rotation angle.

  FIG. 2B is a block diagram illustrating an example of the sensor information processor 103. The receiving unit 11b of the sensor information processing device 103 is configured by an LNA 21b, a mixer 22b, an LPF 23b, a VGA 24b, an ADC 25b, and a DAC 26b, which rotate the rotation angle packet signal instead of the PWM packet signal. The operation is the same as that of each of the LNA 21a, mixer 22a, LPF 23a, VGA 24a, ADC 25a, and DAC 26a of the side controller 102, and the description thereof is omitted.

  The signal processing unit 12b of the sensor information processor 103 includes a packet processing unit 28b, a VGA control unit 29b, and a table 30b. The VGA control unit 29b and the table 30b are the VGA control unit 29a and the table 30a of the rotation-side controller 102. Since the operation is the same as each of the above, description thereof is omitted. The packet processing unit 28b calculates the current rotation angle of the rotors 322 and 325 from the rotation angle information or rotation speed information included in the rotation angle packet signal sent from the fixed-side controller 101 and the internal counter, and the VGA control unit Send to 29b.

  The signal generator 16 and the ADC 36 of the sensor information processor 103 are as described with reference to FIG. The transmission unit 15 of the sensor information processor 103 includes a power amplifier 32, a mixer 33, an LPF 34, and a DAC 35. The DAC 35 performs digital / analog conversion on the voltage / current packet signal received from the signal generation unit 16 and sends the converted signal to the mixer 33 via the LPF 34.

  The mixer 33 is connected to a local oscillator (not shown). The local oscillator is set to oscillate at a frequency of a radio carrier different from that of the PWM packet signal, but may be the same radio carrier frequency as the rotation angle packet signal. The mixer 33 up-converts the received voltage / current packet signal and outputs it to the power amplifier 32. The power amplifier 32 amplifies the received signal and transmits it to the fixed controller 101 as a radio signal via the signal synthesis / distributor 31.

  FIG. 2C is a block diagram illustrating an example of the fixed controller 101. The fixed controller 101 includes a signal synthesizer / distributor 1, a transmitter 2, a receiver 3, a signal generator 4, a signal processor 5, and an ADC 6. The signal generation unit 4 is as described with reference to FIG. 1, and sends the PWM packet signal and the rotation angle packet signal to the transmission unit 2. The transmission unit 2 includes a power amplifier 41, a mixer 42, an LPF 43, and a DAC 44.

  The DAC 44 performs digital / analog conversion on the OFDM (orthogonal frequency-division multiplexing) data of 12 PWM packet signals and one rotation angle packet signal generated by the signal generation unit 4 and inputs them to the mixer 42 via the LPF 43. To do. A local oscillator (not shown) is connected to the mixer 42.

  In this local oscillator, the oscillation frequency is set so that the PWM packet signal and the rotation angle packet signal are superimposed on each radio carrier after the OFDM data is up-converted into an OFDM signal. The power amplifier 41 amplifies the OFDM signal and transmits the amplified signal as a radio signal to the rotation side unit via the signal synthesis / distributor 1.

  The receiving unit 3 includes an LNA 45, a mixer 46, an LPF 47, a VGA 48, an ADC 49, and a DAC 50. The signal processing unit 5 includes a packet processing unit 52, a VGA control unit 53, and a table 54. The table 54 holds a comparison table of the rotation angle and the VGA control voltage. The VGA control unit 53 receives the current rotation angle from the signal generation unit 4, reads the VGA control voltage corresponding to the current rotation angle from the table 54, converts the read VGA control voltage with the DAC 50, and sets it to the VGA 48. To do.

  The LNA 45 amplifies the voltage / current packet signal sent as a radio signal from the sensor information processor 103 and outputs the amplified signal to the mixer 46. A local oscillator (not shown) is connected to the mixer 46, and this local oscillator is set to oscillate at the same frequency as the local oscillator of the transmission unit 15 in the sensor information processor 103.

  The mixer 46 down-converts the radio signal and outputs the baseband signal to the VGA 48 via the LPF 47. The VGA 48 amplifies the voltage / current packet signal that has become the baseband signal with a gain value set via the DAC 50, and outputs the amplified signal to the ADC 49. The ADC 49 performs analog / digital conversion on the received voltage / current packet signal and outputs it to the signal processing unit 5.

  The packet processing unit 52 of the signal processing unit 5 detects the presence or absence of a signal error by using an error detection code such as CRC included in the voltage / current packet signal. When a signal error is not detected, information for generating PWM information of the signal generation unit 4 is updated with voltage and current information included in the voltage / current packet signal.

  In this example, the gain is controlled by using an amplifier that amplifies the baseband signal as a variable gain, that is, VGA 48. However, the gain may be controlled by using the LNA 45 as a variable gain, or both the VGA 48 and the variable gain LNA 45 may be combined. The gain may be controlled as a variable gain.

  Further, as in this example, the PWM packet signal and the rotation angle packet signal are not limited to being transmitted by radio carriers having different frequencies. Whether it should be sent on a radio carrier of a different frequency depends on the allowable delay time of the system. In a system with a margin of allowable delay time, all signals or all signals divided into 2 to 6 may be packetized together with an ID, and the rotation side unit may extract only its own signal, This is effective in terms of effective frequency utilization.

  Next, an example of the operation of the wireless communication device will be described using the flowchart of FIG. For simplification of description, the fixed side unit and the rotating side unit are illustrated separately, the rotating side controller 102 and the sensor information processing unit 103 in the rotating side unit are not described separately, and there are a plurality of power devices and sensors. It is described as being one of them.

  First, the fixed-side controller 101 of the fixed-side unit acquires the rotation angle information of the rotors 322 and 325 from the tachometer 312 and calculates the rotation speed (step S101). Next, the fixed-side controller 101 generates PWM information unique to each power device based on the voltage and current information detected by the sensor of the power converter 104, information such as the rotation speed calculated in step S101, and rotates. A PWM packet signal obtained by packetizing the angle information, the rotation speed information, and the error detection code or error correction code is generated (step S102).

  In step S102, a rotation angle packet signal obtained by packetizing the rotation angle information, the rotation speed information, and the error detection code or error correction code is also generated. Then, the fixed-side controller 101 superimposes the generated PWM packet signal on the wireless carrier and transmits it to the rotation-side controller 102, superimposes the generated rotation angle packet signal on the wireless carrier, and outputs the sensor information processor 103. (Step S103).

  The fixed-side controller 101 refers to the table 54 that holds the comparison table of the rotation angle and the VGA control voltage, reads the VGA control voltage corresponding to the current rotation angle, and sets the read VGA control voltage to the VGA 48 (step) S104), waiting for a signal from the rotation side unit (step S105).

  On the other hand, the rotation-side controller 102 and the sensor information processor 103 of the rotation-side unit in the reception standby state (step S201) receive the PWM packet signal and the rotation angle packet signal, respectively, from the fixed-side unit (step S202). Then, each of the rotation-side controller 102 and the sensor information processor 103 detects the presence or absence of a signal error by error detection using an error detection code such as CRC included in each packet signal (step S203).

  If a signal error is detected, that is, if YES in step S203, the rotation-side controller 102 discards the packet, forcibly turns off the power device (step S204), and sets the two power devices that constitute the inverter. Prevent simultaneous on. In the sensor information processor 103, the packet is discarded, and the process proceeds to step S210 to be described later in order to transmit voltage and current information.

  If no signal error is detected, that is, if NO in step S203, the internal counters of the rotation-side controller 102 and the sensor information processor 103 are reset (step S205). Next, each of the rotation-side controllers 102 extracts PWM information specific to each power device from the received PWM packet signal, generates a PWM pulse (step S206), and sends it to each power device (step S207).

  Thereafter, the rotation-side controller 102 calculates the current rotation angle of the rotor based on the rotation angle information or rotation speed information included in the PWM packet signal and the internal counter, and the sensor information processor 103 is included in the rotation angle packet signal. The current rotation angle is calculated from the rotation angle information or the rotation speed information and the internal counter (step S208).

  The rotation-side controller 102 and the sensor information processor 103 read the VGA control voltage corresponding to the calculated current rotation angle with reference to the table 30 holding the comparison table of the rotation angle and the VGA control voltage, and via the DAC 26 Then, the voltage is set to the VGA 24 (step S209). Here, steps S208 to S209 may be performed in parallel with steps S206 to S207.

  The sensor information processor 103 packetizes the voltage and current information sent from the sensor as a voltage / current packet signal including the error detection code or the error correction code at the timing of receiving the rotation angle packet signal (step S210). The packetized voltage / current packet signal is transmitted to the fixed-side controller 101 (step S211).

  When receiving the voltage / current packet signal from the sensor information processor 103 (step S106), the fixed-side controller 101 of the fixed-side unit that has been in the reception standby state from step S105 is included in the voltage / current packet signal as in step S203. The presence or absence of a signal error is detected by error detection using an error detection code such as CRC (step S107).

  If no signal error is detected, the fixed controller 101 updates the voltage and current information (step S108), returns to step S101, and repeats a series of operation flows. If a signal error is detected, the fixed controller 101 returns to step S101 without updating the voltage and current information.

  The current rotation angle is calculated by counting the time after the internal counter is reset, and multiplying the counted time by the rotation speed information to calculate the rotation angle that occurs after the reset. It is also possible to calculate by adding rotation angle information related to the rotation angle. The counted time to be multiplied may be a time from the reset point to the multiplication point, or a predetermined operation time of the rotation-side controller 102 and the sensor information processor 103 and set in advance at this time. It may be a time obtained by adding or subtracting.

  Note that the PWM packet signal and the rotation angle packet signal include rotation angle information and rotation speed information as information on the rotation angle. However, in order to perform a more accurate rotation angle calculation, information on rotational acceleration is added. Also good. For this purpose, the rotational acceleration may be calculated in step S101.

  The table 30 includes a correspondence between the rotation angle and the VGA control voltage value for each minute pitch of the rotation angle, and may cover 360 degrees, and the rotation angle between them including the representative rotation angle is interpolated. May be. Further, the VGA control voltage value included in the table 30 is not a numerical value but may be a function expression of the rotation angle. The table 30 may be set from an input device or a network (not shown).

  Before shifting to the steady operation as described above, synchronization of rotation angle information (VGA set voltage based on synchronized rotation angle information) is required between the fixed controller 101, the rotation controller 102, and the sensor information processor 103. It becomes. In the case of wind power generation, in the case of wind power generation, the following processing may be performed from the start wind speed at which the blades start to rotate by the wind power until the cut-in wind speed at which the power generation operation starts is reached.

  First, the rotation-side controller 102 and the sensor information processor 103 set a VGA set voltage corresponding to a predetermined reference angle and stand by. On the other hand, the fixed-side controller 101 monitors rotation angle information from the tachometer 312 and sends a trigger signal to the rotation-side controller 102 and the sensor information processor 103 at a timing when the same reference angle as that of the rotation-side controller 102 or the like is reached. Send.

  The rotation-side controller 102 and the sensor information processor 103 can receive this trigger signal synchronously with the reference angle, start the operation of the internal counter, and thereafter calculate the current rotation angle and receive it normally. Is transmitted to the fixed-side controller 101. The fixed controller 101 waits until the cut-in wind speed after receiving the ACK signal from the rotation-side controller 102 and the sensor information processor 103 that communicate after the cut-in wind speed.

  Moreover, it is not limited to the synchronization at the reference angle, and the following processing may be performed. The rotation-side controller 102 and the sensor information processor 103 set the central value of the VGA set voltage range set in the table 30 to VGA 24 and stand by. The fixed controller 101 always sends the current rotation angle information to the rotation controller 102 and the sensor information processor 103.

  When the rotation-side controller 102 and the sensor information processor 103 normally receive the rotation angle information transmitted from the fixed-side controller 101, the rotation-side controller 102 and the sensor information processor 103 start the operation of the internal counter, and thereafter calculate the current rotation angle, and the ACK signal Is transmitted to the fixed-side controller 101. The fixed-side controller 101 waits until the cut-in wind speed after the ACK signals from the rotation-side controller 102 and the sensor information processor 103 that communicate after the cut-in wind speed are aligned.

  FIG. 4 is a block diagram illustrating an example of the power converter 104. The power converter 104 includes twelve power devices 17, six current sensors 18, and one voltage sensor 19. For example, the power converter 104 of the wind power generation system 321 includes a two-level three-phase inverter (U phase, V phase, W phase) and a two-level three-phase converter (R phase, T phase, S phase). Therefore, it has 12 power devices (2 per unit x 3 phases x 2). Moreover, in order to sense the current values of the three phases for two systems (3 × 2) and the voltage value of the inverter (one), seven sensors are provided.

  Although the configuration of the wireless communication device is as described above, the fixed-side controller 101 may transmit the same PWM information superimposed on a plurality of wireless carriers instead of transmitting different PWM information for each wireless carrier. The rotation-side controller 102 can improve communication reliability by verifying whether the PWM information of a plurality of wireless carriers matches.

  In addition, switching noise of an inverter having a frequency region up to about 1 GHz and magnetic field noise from the motor are present in the generator, and these noises greatly affect communication quality. For this reason, it is desirable that the fixed-side controller 101, the rotation-side controller 102, and the sensor information processing device 103 are each packaged with a material that has a shielding effect against electromagnetic waves and magnetic fields, except for an antenna that transmits and receives radio signals.

(3) Configuration of Antenna Next, antennas mounted on the fixed side and the rotating side will be described. In the example shown in FIG. 6, the cylindrical rotors 322 and 325 are supported by the rotary shaft 302 in the hollow cylindrical stators 323 and 326 and received by the blade 303 around the rotary shaft 302. Rotated by wind power.

  FIG. 5 is a block diagram illustrating an example of an antenna. In the example shown in FIG. 5, for the sake of simplicity of explanation, the explanation will be made assuming that the rotation side antenna unit 205 is four and the total of the rotation side controller 102 and the sensor information processor 103 is four, but the number is limited to four. It may be 3 or less or 5 or more. In order to facilitate understanding of the arrangement of the fixed antenna unit 204 and the rotating antenna unit 205, the antenna mounting portion is shown in a perspective view.

  The fixed-side controller 109a and the fixed-side antenna unit 204 shown in FIG. 5 constitute the fixed-side controller 101 shown in FIGS. 1 and 6, and are mounted on a fixed member 201 that is physically coupled to the stators 323 and 326. The The rotation-side controller 105 and the rotation-side antenna units 205a to 205c shown in FIG. 5 constitute the rotation-side controller 102 shown in FIGS. 1 and 6, and the rotation member 202 physically coupled to the rotors 322 and 325 Has been implemented. The sensor information processor 106 and the rotation-side antenna unit 205 d illustrated in FIG. 5 constitute the sensor information processor 103 and are mounted on the rotation member 202.

  The PWM packet signal and the rotation angle packet signal output from the fixed-side controller 109a are input to the fixed-side antenna unit 204, and the same radio signal from the fixed-side antenna unit 204 toward the surface on which the rotation-side antenna unit 205 is mounted. Is emitted. The radiated radio signal is received by each of the four rotation-side antenna units 205 and sent to the rotation-side controller 105 and the sensor information processor 106.

  On the other hand, the voltage / current packet signal output from the sensor information processor 106 is input to the rotation-side antenna unit 205d, and a radio signal is emitted from the rotation-side antenna unit 205d toward the surface on which the fixed-side antenna unit 204 is mounted. The The radiated radio signal is received by the fixed antenna unit 204 and sent to the fixed controller 109a.

  Here, since the fixed member 201, the rotating member 202, and the rotating shaft 203 are made of a material such as metal that reflects radio waves, wireless signals are transmitted and received in a so-called closed space as shown in FIG. . Although depending on the power generation capacity of the wind power generator, the radius of the fixed member 201 is several meters, and a closed space corresponding to the radius is formed.

  For example, since the wavelength of a 2.5 GHz band radio wave generally used in a wireless LAN or the like is 12 cm, a closed space having a scale of 10 wavelengths or more is formed. In radio wave propagation in such a large closed space, a standing wave is generated as a result of the synthesis of a plurality of reflected waves, and a radio signal received according to the relative position of transmission and reception in the closed space The strength of is greatly different.

  In the example shown in FIG. 5, since the relative positions of transmission and reception are determined according to the rotation angle of the rotating member 202, the intensity of the received radio signal is also determined according to the rotation angle, and the gain is controlled according to the rotation angle. By doing so, the radio signal can be converted into a stable signal.

  Insulation is indispensable between the four rotation-side antenna units 205 and between the four rotation-side controllers 105 and the sensor information processor 106, and is determined by a safety standard (for example, JISC1010-1). Keep more than the minimum creepage distance. This is to prevent the occurrence of so-called creeping discharge, in which a dendritic discharge path is formed along the surface of the dielectric by corona discharge or spark discharge in the case where there are two electrodes at the boundary between the gas and the dielectric. Is the standard.

  In general, creeping discharge is generated with a shorter electrode distance and lower applied voltage than space discharge, and is therefore an important design item. Similarly, from the viewpoint of insulation, each of the four rotating side antenna portions 205 is made of an insulating material. It is effective to be fixed to the rotating member 202 via

  As described above, the wireless communication apparatus according to the present embodiment performs communication by the wireless communication device between the fixed side unit and the rotating side unit with low delay and high quality in a closed space formed of metal or the like. be able to. In particular, since the received signal can be adjusted, signal errors of the rotation angle packet signal, the PWM packet signal, and the voltage / current packet signal can be reduced, and the delay time until correct reception by retransmission can be reduced. Further, by performing processing on the receiving side, a plurality of transmitting antenna units are not necessary and can be realized with a simple configuration.

  Hereinafter, Example 2 is demonstrated using FIGS. In the first embodiment, the rotation angle is always used, but in the second embodiment, the rotation angle is used according to the rotation speed. FIG. 7 is a block diagram illustrating an example of the reception unit 11 c and the signal processing unit 60. The receiving unit 11c has the same configuration as the receiving unit 11a illustrated in FIG. 2A and the receiving unit 11b illustrated in FIG.

  The signal processor 60 replaces the signal processor 12a shown in FIG. 2A and the signal processor 12b shown in FIG. 2B. 1 is obtained by replacing the signal processing unit 12a of the rotation-side controller 102 and the signal processing unit 12b of the sensor information processing device 103 with the signal processing unit 60 in the wireless communication device shown in FIG. It becomes. Note that the signal processing unit 5 of the fixed-side controller 101 may be replaced with the signal processing unit 60.

  The signal processing unit 60 includes a packet processing unit 28c, a VGA control unit 29c, a table 30c, and a signal monitoring unit 59. The packet processing unit 28c determines whether the value of the rotation speed information included in the PWM packet signal or the rotation angle packet signal is equal to or greater than a predetermined value. The angle is calculated and sent to the VGA controller 29c.

  In addition, the packet processing unit 28 c transfers the signal input from the ADC 25 c to the signal monitoring unit 59. Other processes of the packet processing unit 28c are the same as those of the packet processing units 28a and 28b. For example, a signal error of the PWM packet signal is detected and the gate driver 13 outside the signal processing unit 60 is controlled. However, since it has already been described in the first embodiment, the description is omitted.

  When the rotation angle is sent from the packet processing unit 28c, the VGA control unit 29c reads the VGA control voltage corresponding to the rotation angle from the table 30c, converts the read VGA control voltage by the DAC 26c, and sets it in the VGA 24c. Here, the table 30c is the same as the tables 30a and 30b. If the rotation angle is not sent from the packet processing unit 28c, the value sent from the signal monitoring unit 59 is transferred to the DAC 26c, converted by the DAC 26c, and set in the VGA 24c.

  That is, if the value of the rotational speed information is smaller than the predetermined value, the process proceeds to AGC processing, and the signal monitoring unit 59 continues to monitor the intensity of the signal transferred from the packet processing unit 28c for a certain period of time, and the average value thereof Is calculated and sent to the VGA controller 29c. Here, the VGA control unit 29c may convert the value sent from the signal monitor unit 59, and the conversion may be a conversion in which the output of the VGA 24c is, for example, 90% of the input range of the ADC 25c. Good.

  Furthermore, when a value is sent from the signal monitor unit 59, the VGA control unit 29c may update the VGA control voltage held in the table 30c based on the sent value. When updating in this way, even if it is determined that the value of the rotation speed information is less than the predetermined value, the packet processing unit 28c sends the calculated rotation angle to the VGA control unit 29c, and the value of the rotation speed information is the predetermined value. The information that it was less than may be sent to the VGA control unit 29c.

  Next, an example of the operation of the wireless communication apparatus according to the second embodiment will be described with reference to the flowchart of FIG. For simplification of description, the description is the same as FIG. Further, steps S101 to S103, S105, and S201 to S207 shown in FIG. 8 are the same as steps S101 to S103, S105, and S201 to S207 described with reference to FIG. Omitted. However, after step S204, the process proceeds to step S225.

  After step S207, the packet processing unit 28c determines whether the value of the rotation speed information included in the PWM packet signal or the rotation angle packet signal is equal to or greater than a predetermined value (step S221). If it is determined that the value is equal to or greater than the predetermined value, the current rotation angle is calculated as in step S208 (step S222). Then, the VGA control voltage corresponding to the calculated current rotation angle is read with reference to the table 30c, and the voltage is set to the VGA 24c via the DAC 26c (step S224).

  On the other hand, if it is determined that the value is smaller than the predetermined value, the signal monitor unit 59 continues to monitor the intensity of the signal for a certain period of time, and calculates the average value (step S223). Then, based on the calculated average value, the VGA control unit 29c controls the VGA 24c via the DAC 26c so that the output of the VGA 24c becomes, for example, 90% of the input range of the ADC 25c (step S224).

  In step S223 or step 224, the VGA control voltage held in the table 30c may be updated based on the VGA control voltage for controlling the VGA 24c. Steps S221 to S224 may be performed in parallel with steps S206 to S207.

  The sensor information processor 103 packetizes the voltage and current information sent from the sensor as a voltage / current packet signal including the error detection code or the error correction code at the timing of receiving the rotation angle packet signal (step S225). The packetized voltage / current packet signal is transmitted to the fixed-side controller 101 (step S226).

  Steps S106 and S107 of the fixed-side controller 101 of the fixed-side unit that has been in the reception standby state from step S105 shown in FIG. 8 are the same as steps S106 and S107 described with reference to FIG. Therefore, the description is omitted. If no signal error is detected in step S107, it is determined whether the rotational speed is equal to or higher than a predetermined value as in step S221 (step S110).

  If it is determined that the value is equal to or greater than the predetermined value, the VGA control voltage corresponding to the current rotation angle is read with reference to the table 54 of the fixed controller 101, and the voltage is set to the VGA 48 via the DAC 50 (step S112). .

  On the other hand, if it is determined that the rotation speed is smaller than the predetermined value, the signal monitor unit (not shown in FIG. 2C) corresponding to the signal monitor unit 59 shown in FIG. Is calculated (step S111). Based on the calculated average value, the VGA controller 53 controls the VGA 48 via the DAC 50 so that the output of the VGA 48 is, for example, 90% of the input range of the ADC 49 (step S112).

  Here, in step S111 or step 112, the VGA control voltage held in the table 54 may be updated based on the VGA control voltage for controlling the VGA 48.

  Next, the fixed-side controller 101 updates the voltage and current information (step S113), returns to step S101, and repeats a series of operation flows. If a signal error is detected in step S107, the process returns to step S101 without updating the voltage and current information.

  Note that the predetermined value used for the determination of the rotation speed is a movement distance of 1/20 of the wavelength of the radio carrier by the rotation-side antenna unit 205 that moves by rotation in the communication time of one PWM packet signal. It may be speed.

  In addition, the time during which the signal monitoring unit 59 continues to monitor the signal intensity for averaging may be changed according to the rotation speed. When the rotational speed is high, the time may be shortened, and when the rotational speed is low, the time may be lengthened, thereby improving the control accuracy. Furthermore, when the rotation speed is low and the AGC processing is performed, reading and using the initial value of the VGA control voltage from the table 30c greatly contributes to high system reliability.

  Moreover, if the structure of Example 2 is used, the value of the table 30c can be input by operating the wind power generation system 321. FIG. 9 is a flowchart illustrating an example of an input operation to the table 30c of the wireless communication device. The configuration of the wind power generation system 321 is the configuration described with reference to FIGS.

  When the wind speed at which the blade 303 starts rotating due to the wind force, first, the fixed-side controller 101 of the fixed-side unit acquires rotation angle information from the tachometer 312 (step S301), and the rotation-side controller 102 and sensor of the rotating-side unit. A rotation angle packet signal is transmitted to the information processor 103 (step S302). Thereafter, the fixed controller 101 repeats steps S301 and S302 until a signal is received from the rotation unit, and continues to transmit a rotation angle packet signal based on the current rotation angle.

  On the other hand, when receiving the rotation angle packet signal (step S402), the rotation-side controller 102 and the sensor information processor 103 of the rotation-side unit in the reception standby state (step S401) receive the rotation angle packet signal that is continuously sent. Subsequently, the signal monitor 59 continues to monitor the intensity of the signal for a certain period of time, and the average value is calculated (step S403).

  Whether the rotation-side controller 102 and the sensor information processor 103 have the calculated average value within a predetermined range (for example, within the VGA control voltage range where the output of the VGA 24c is 75 to 95% of the input range of the ADC 25c). Is determined (step S404). When it is determined that it is not within the predetermined range, the VGA control voltage is updated so as to be within the predetermined range (step S405), and the process returns to step S403.

  On the other hand, when it is determined that it is within the predetermined range, the rotation-side controller 102 and the sensor information processor 103 calculate the current rotation angle from the rotation angle packet signal (step S406), and update the internal counter. Information on the calculated rotation angle and VGA control voltage is input to the table 30c (step S407). Then, the information input to the table 30c is transmitted as a signal to the fixed-side controller 101 (step S408).

  The fixed-side controller 101 receives the signal transmitted in step S408 (step S304), and determines whether or not the creation of the 360 degree table 30c in a predetermined angle unit is completed based on the rotation angle information included in the signal (step S304). If it is determined that the cut-in wind speed is reached (step S304), the process waits (step S305).

  The input to the table 30c of the rotation side unit has been described above, but a dummy signal is always transmitted from the rotation side unit instead of the rotation angle packet signal for the input of the table 54 of the fixed side unit corresponding to the table 30c. By doing so, the same processing can be realized.

  As described above, the radio communication apparatus according to the present embodiment can select VGA control according to the rotation speed, and as a result, can contribute to high system reliability. Moreover, since a table can be input after assembling as a wind power generator, a part of preparation process can be omitted. Even in the input of the table, by processing on the receiving side, a plurality of parameters are not related to one rotation angle unlike the transmitting side.

  Hereinafter, Example 3 will be described with reference to FIGS. 10 and 11. In the first and second embodiments, the rotation-side controller 102 and the sensor information processor 103 are separated. In the third embodiment, the rotation-side controller 107 performs both operations. FIG. 10 is a block diagram illustrating an example of a wireless communication apparatus according to the third embodiment. Hereinafter, as a circuit system for wireless communication, frequency-multiplexed full-duplex communication using a direct conversion receiver will be described as an example.

  The number of rotation-side controllers 107 is, for example, twelve, and the twelve rotation-side controllers 107 are connected to twelve power devices in the power converter 104, respectively. Also, seven of the twelve rotation-side controllers 107 are connected to seven sensors, respectively. The five rotation-side controllers 107 that are not connected to the sensors may be the rotation-side controllers 102 described with reference to FIG.

  The rotation-side controller 107 includes a signal synthesizer / distributor 31, a receiver 11, a signal processor 12, a gate driver 13, a transmitter 15, a signal generator 16, and an ADC 36. Among these, the operations other than the signal processing units 12d and 12e and the signal generation units 16d and 16e perform the same operations as those described with reference to FIG. However, the local oscillators of the transmitting units 15d and 15e are set to transmit at a frequency of a radio carrier different from that of the PWM packet signal and other voltage / current packet signals.

  The signal processing units 12 d and 12 e perform the same operation as the signal processing unit 12 a of the rotation-side controller 102 described with reference to FIG. 1 and the same operation as the signal processing unit 12 b of the sensor information processing device 103. The signal generators 16d and 16e receive the voltage information or current information of any of the seven sensors from the ADCs 36d and 36e, and at the timing when the PWM packet signal including the rotation angle information is received, the voltage information or current information is incorrect. The detection code or the error correction code is packetized and sent as a voltage / current packet signal to the transmitters 15d and 15e.

  The fixed-side controller 111 includes a signal synthesizer / distributor 1d, a transmitter 2, a receiver 3, a signal generator 4d, a signal processor 5 and an ADC 6, and transmits a PWM packet signal including PWM information and rotation angle information. A current packet signal is received. Since there are a plurality of reception units 3 and signal processing units 5, the signal generation unit 4d is connected to a plurality of signal processing units 5, and the signal synthesizer / distributor 1d is connected to a plurality of reception units 3, and will be described with reference to FIG. To do.

  FIG. 11 is a block diagram illustrating an example of the fixed-side controller 111. The transmitter 2 and the ADC 6 including the power amplifier 41, the mixer 42, the LPF 43, and the DAC 44 of the fixed-side controller 111 are as described with reference to FIG. 2C. The receiving unit 3 including the LNA 45, VGA 48, LPF 47, ADC 49, and DAC 50 of the fixed controller 111 and the signal processing unit 5 including the packet processing unit 52, the VGA control unit 53, and the table 54 are also described with reference to FIG. 2C. As described above, seven receiving units 3 and seven signal processing units 5 are provided in parallel.

  Local oscillators (not shown) are connected to the mixers 46d and 46e, respectively, and these oscillators are set to oscillate at the same frequency as the local oscillators of the transmission units 15d and 15e in the rotation-side controller 107. ing. Further, the signal synthesizer / distributor 1d inputs the voltage / current packet signals from the rotation-side controllers 107d and 107e to the receiving units 3d and 3e without distinction. Thereby, each of the reception units 3d and 3e sends the voltage / current packet signal transmitted by each of the rotation-side controllers 107d and 107e to the signal processing units 5d and 5e.

  Based on the rotation angle information sent from the tachometer 312 via the ADC 6, the signal generation unit 4 d of the fixed-side controller 111 includes a plurality of rotation-side controllers 107 d, like the rotation-side antenna unit 205 shown in FIG. The relative rotation angle of the different rotation side antenna unit is calculated for each 107e, and the current angle of each rotation side antenna unit is sent to each of the VGA control units 53d and 53e.

  As described above, the voltage and current information of each sensor can be individually input to a plurality of rotary controllers without being integrated into one, and the system can be reduced in size. As described above, the transmission unit, the reception unit, the signal processing unit, and the signal generation unit of the rotor unit can be shared as long as they have necessary functions.

  Hereinafter, Example 3 will be described with reference to FIGS. In the first to third embodiments, an example in which there are a plurality of rotation-side controllers 102 and 107 is shown, but in the fourth embodiment, an example in which there is one rotation-side controller 108 is shown. FIG. 12 is a block diagram illustrating an example of a wireless communication apparatus according to the fourth embodiment. Hereinafter, as a circuit system for wireless communication, frequency-multiplexed full-duplex communication using a direct conversion receiver will be described as an example.

  The rotation-side controller 108 is connected to 12 power devices in the power converter 104. For this purpose, the rotation-side controller 108 includes twelve gate drivers 13f and 13g and twelve insulating elements 57f and 57g. The rotation-side controller 108 includes a signal synthesizer / distributor 31f, a receiver 11f, a signal processor 12f, a transmitter 15f, a signal generator 16f, and an ADC 36f. Among these, the components other than the signal processor 12f are illustrated in FIG. Since the same operations as those described with reference to 2A and 2B are performed, description thereof is omitted.

  The signal processing unit 12f operates in the same manner as the signal processing unit 12 of the rotation-side controller 107 described with reference to FIG. 10, but extracts 12 pieces of PWM information from one PWM packet signal, and extracts the extracted PWM information. Is sent to each gate driver 13 via the insulating element 57. Here, the insulating elements 57f and 57g insulate the internal circuit of the rotation-side controller 108 from the gate drivers 13f and 13g, respectively, and thereby insulate the gate drivers 13f and 13g. The insulating elements 57f and 57g may be a pulse transformer, a photocoupler, an optical communication device using an optical fiber as a transmission path, or the like.

  Note that, in the receiving unit 11f, as described with reference to FIG. 2A, the gain may be controlled by changing the gain of the LNA. In the configuration of the fourth embodiment, since there are few interference waves, it is effective to control the gain of the LNA before down-conversion within a range where the mixer is not saturated. Accordingly, the VGA may be a fixed gain baseband amplifier.

  The fixed controller 121 includes a signal synthesizer / distributor 1, a transmitter 2 f, a receiver 3, a signal generator 4 f, a signal processor 5, and an ADC 6, and is connected to a tachometer 312. Among these, except for the transmission unit 2f and the signal generation unit 4f, the same operations as those described with reference to FIGS.

  The signal generation unit 4f sends a packetized PWM packet signal including PWM information of 12 power devices and rotation angle information and rotation speed information of the rotors 322 and 325 to the transmission unit 2f. Each of 12 pieces of PWM information included in one PWM packet signal may be identified by adding an ID. The transmission unit 2f superimposes the PWM packet signal on a radio carrier having a frequency different from that of the voltage / current packet signal, and transmits the superimposed signal to the rotation-side controller 108.

  Here, the PWM information does not necessarily include the number of power devices. For example, the PWM information for each phase may be sent and the other PWM pulse may be generated in consideration of the dead time.

  FIG. 13 is a block diagram illustrating an example of an antenna according to the fourth embodiment. In order to facilitate understanding of the arrangement of the fixed antenna unit 204 and the rotating antenna unit 205f, the antenna mounting portion is shown in a perspective view, and the fixing member 201, the rotating member 202, and the rotating shaft 203 are the same as those in FIG. Therefore, the same reference numerals are given and description thereof is omitted.

  The fixed-side controller 109f and the fixed-side antenna unit 204 shown in FIG. 13 constitute the fixed-side controller 121 shown in FIG. 12, and the rotation-side controller 110f and the rotation-side antenna unit 205f shown in FIG. The rotation side controller 108 shown is configured.

  The PWM packet signal and the rotation angle packet signal output from the fixed-side controller 109f are input to the fixed-side antenna unit 204, and the same radio signal from the fixed-side antenna unit 204 toward the surface on which the rotation-side antenna unit 205f is mounted. Is emitted. The radiated radio signal is received by the rotation side antenna unit 205f and sent to the rotation side controller 110f.

  On the other hand, the voltage / current packet signal output from the rotation-side controller 110f is input to the rotation-side antenna unit 205f, and a radio signal is radiated from the rotation-side antenna unit 205f toward the surface on which the fixed-side antenna unit 204 is mounted. . The radiated radio signal is received by the fixed antenna unit 204 and sent to the fixed controller 109f. As described above, similarly to the description in the first embodiment, the radio signal is transmitted and received in the closed space formed by the fixed member 201, the rotating member 202, and the rotating shaft 203.

  As described above, in the case of a configuration with few interference waves, it is possible to improve the overall SN by providing an amplifier circuit whose gain is controlled near the antenna. In addition, by outputting PWM pulses to the gate drivers 13f and 13g via the insulating elements 57f and 57g to the rotation side unit, wireless communication between the fixed side unit and the rotation side unit is reduced in the number of channels (wireless carrier). The number of frequencies) can contribute to simplification of the wireless communication unit. Furthermore, since the PWM pulse can be generated by the rotation-side controller 108, tolerance for communication errors and delays is increased, and a more robust system can be realized.

(C. Effect of embodiment)
The wireless communication apparatus according to the above embodiment performs communication by a wireless communication apparatus that transmits and receives signals between a rotating body and a fixed body in a closed space formed of metal or the like with low delay and high quality. It is possible to provide a highly reliable wireless communication device for a rotating electrical machine of a power generation system such as hydraulic power and thermal power.

(D. Appendix)
In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

  Further, a part of a configuration example of a certain embodiment can be replaced with another configuration example of the same embodiment or a configuration example of another embodiment, and the configuration example of a certain embodiment can be replaced with the same embodiment. It is also possible to add configurations of other configuration examples or configuration examples of other embodiments. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  In addition, each of the above-described configurations, functions, processing units, processing means, and the like may be realized in hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

  Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

11: Receiver 12: Signal processor 24: VGA
28: Packet processing unit 29: VGA control unit 30: Table 101: Fixed side controller 102: Rotation side controller 103: Sensor information processor 104: Power converter 321: Wind power generation system 322: Rotor 323: Stator 324: Main Generator 325: Rotor 326: Stator 327: Auxiliary generator

Claims (15)

A fixed body,
A substantially cylindrical rotating body that rotates about a rotating shaft attached to the fixed body;
A fixed-side communication unit installed on the fixed body;
In a wireless communication device comprising a rotation side communication unit installed in the rotating body,
The rotation side communication unit is
A receiver that receives a radio signal from the fixed-side communication unit and amplifies the received signal by a variable gain amplifier;
A signal processing unit for controlling the variable gain amplifier by acquiring a control voltage corresponding to an angle corresponding to a rotation angle of the rotating body from a recording unit that holds in advance correspondence between a plurality of angles and a plurality of control voltages. And a wireless communication apparatus. The wireless communication device according to claim 1,
The fixed-side communication unit is
Based on the measured rotation angle, information on the rotation angle is transmitted to the rotation side communication unit,
In the rotation side communication unit,
The receiving unit receives information about the rotation angle,
The wireless communication apparatus, wherein the signal processing unit acquires a rotation angle of the rotating body from information on a rotation angle. The wireless communication device according to claim 1,
In the rotation side communication unit,
The signal processing unit measures the signal strength at the receiving unit, and controls the variable gain amplifier according to either the control voltage acquired from the recording unit or the measured signal strength. Wireless communication device. The wireless communication device according to claim 2,
In the fixed side communication unit,
Calculate the rotation speed based on the measured rotation angle, and transmit the measured rotation angle and the calculated rotation speed as information about the rotation angle to the rotation side communication unit,
In the rotation side communication unit,
The signal processing unit calculates a current rotation angle based on the measured rotation angle and the calculated rotation speed included in the information on the rotation angle, and a control voltage corresponding to the angle corresponding to the calculated current rotation angle Is acquired from the recording unit. The wireless communication device according to claim 3,
In the rotation side communication unit,
The wireless communication apparatus, wherein the signal processing unit changes a control voltage held in the recording unit in accordance with a measured signal strength. The wireless communication device according to claim 3,
In the rotation side communication unit,
The signal processing unit changes a predetermined time according to the rotational speed of the rotating body, averages the intensity of the measured signal over a predetermined time, and controls the variable gain amplifier based on the averaged intensity. A wireless communication device. The wireless communication device according to claim 3,
In the rotation side communication unit,
The signal processing unit performs a first control on the variable gain amplifier according to a control voltage acquired from the recording unit,
The receiving unit amplifies the received signal as the first signal by the variable gain amplifier subjected to the first control,
The wireless communication apparatus, wherein the signal processing unit measures the intensity of the first signal and performs second control on the variable gain amplifier based on the measured first signal intensity. The wireless communication device according to claim 3,
In the rotation side communication unit,
When the signal processing unit determines that the rotation speed of the rotating body is equal to or less than a predetermined value, the signal processing unit measures the signal strength at the receiving unit, and controls the variable gain amplifier based on the measured signal strength. A wireless communication device. A rotor that rotates around an axis of rotation with an external force and generates a magnetic field with supplied power; and a stator that positions the axis of rotation and transmits electric power generated by a change in the magnetic field of the rotor to an electric power system. A main generator having
An auxiliary generator having an auxiliary stator that is supplied with electric power from an electric power system to generate a magnetic field, and an auxiliary rotor that rotates together with the rotor and generates electric power by the magnetic field of the auxiliary stator;
A power converter that converts the voltage and frequency of power generated in the auxiliary rotor and supplies the converted power to the rotor;
A rotation-side controller that rotates together with the rotor;
In a power generation system comprising a fixed controller fixed together with the stator and wirelessly communicating with the rotating controller,
The fixed controller is
Sending information to control the conversion of the power converter as a radio signal to the rotating controller,
The rotation-side controller is
A receiver that receives a radio signal from the fixed-side controller and amplifies the received signal with a variable gain amplifier;
An angle corresponding to the rotation angle of the rotor from a recording unit that extracts information from the amplified signal, controls conversion of the power converter, and holds associations between a plurality of angles and a plurality of control voltages And a signal processing unit that acquires the control voltage corresponding to and controls the variable gain amplifier. The power generation system according to claim 9, wherein
The fixed controller is
Based on the measured rotation angle, information on the rotation angle is transmitted to the rotation side controller,
In the rotation side controller,
The receiving unit receives information about the rotation angle,
The power generation system, wherein the signal processing unit acquires a rotation angle of the rotor from information on a rotation angle. The power generation system according to claim 9, wherein
In the rotation side controller,
The signal processing unit measures the signal strength at the receiving unit, and controls the variable gain amplifier according to either the control voltage acquired from the recording unit or the measured signal strength. Power generation system. The power generation system according to claim 10, wherein
The fixed controller is
Calculate the rotation speed based on the measured rotation angle, and transmit the measured rotation angle and the calculated rotation speed to the rotation side controller as information on the rotation angle,
In the rotation side controller,
The signal processing unit calculates a current rotation angle based on the measured rotation angle and the calculated rotation speed included in the information on the rotation angle, and a control voltage corresponding to the angle corresponding to the calculated current rotation angle Is obtained from the recording unit. The power generation system according to claim 11, wherein
In the rotation side controller,
The power generation system, wherein the signal processing unit changes a control voltage held in the recording unit in accordance with a measured signal strength. The power generation system according to claim 11, wherein
In the rotation side controller,
The signal processing unit changes a predetermined time according to the rotation speed of the rotor, averages the measured signal intensity over the changed predetermined time, and controls the variable gain amplifier based on the averaged intensity A power generation system characterized by The power generation system according to claim 11, wherein
In the rotation side controller,
The signal processing unit performs a first control on the variable gain amplifier according to a control voltage acquired from the recording unit,
The receiving unit amplifies the received signal as the first signal by the variable gain amplifier subjected to the first control,
The power generation system, wherein the signal processing unit measures the intensity of the first signal and performs second control on the variable gain amplifier based on the measured first signal intensity.

Images