Control device, switching system, and control method

Abstract

To make it possible to suppress an electromagnetic noise with a simple configuration.SOLUTION: The control device includes a control unit configured to generate first control information regarding timing with which a first switching control device performs switching control and second control information regarding timing with which a second switching control device performs switching control on the basis of location information on the first switching control device and location information on the second switching control device.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a control device, a switching system, and a control method. [Background technology]

[0002] 2. Description of the Related Art In a servo control system that drives and controls a multi-axis motor using a plurality of inverters, a technique is known in which the carrier frequencies of the plurality of inverters are made different from one another to suppress switching noise.

[0003] However, the number of available carrier frequencies is finite, and if the number of inverters exceeds the maximum number of available carrier frequencies, the same carrier frequency must be used by two or more inverters, which poses the problem of increased electromagnetic noise. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-27236 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, one embodiment of the present invention provides a control device, a switching system, and a control method that are capable of suppressing electromagnetic noise with a simple configuration. [Means for solving the problem]

[0006] In order to solve the above problem, according to one embodiment of the present invention, a control device is provided, which includes a control unit that generates first control information regarding the timing at which the first switching control device performs switching control and second control information regarding the timing at which the second switching control device performs switching control based on position information of the first switching control device and position information of the second switching control device. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a block diagram showing a schematic configuration of a control device and a switching system according to a first embodiment. [Figure 2] FIG. 2 is a detailed block diagram of the switching control device shown in FIG. 1. [Figure 3] FIG. 10 is a diagram showing an example of the distance between any two switching control devices. [Figure 4] FIG. 1 is a diagram showing the relationship between distance and propagation loss obtained from equation (1). [Figure 5] FIG. 2 is a block diagram showing the internal configuration of each switching control device in FIG. 1. [Figure 6] FIG. 4 is a timing chart illustrating the processing operation of a PWM signal generating unit. [Figure 7] FIG. 1 is a diagram showing a specific example of a switching system according to a first embodiment. [Figure 8] FIG. 8 is a diagram showing control parameters used by each switching control device in FIG. 7; [Figure 9] FIG. 10 is a block diagram showing a schematic configuration of a switching system according to a second embodiment. [Figure 10] A diagram showing the distance between any two switching control devices. [Figure 11] FIG. 10 is a diagram showing a carrier frequency included in an estimated control parameter of the switching control device. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of a control device, a switching system, and a control method will be described with reference to the drawings. The following description will focus on the main components of the control device and the switching system, but components and functions that are not shown or described may exist. The following description does not exclude components and functions that are not shown or described.

[0009] (First embodiment) Fig. 1 is a block diagram showing a schematic configuration of a control device 1 and a switching system 2 according to the first embodiment. The switching system 2 in Fig. 1 includes a plurality of switching control devices 3 and a central control device 4. The central control device 4 in Fig. 1 corresponds to the control device 1 according to the first embodiment. In this specification, the central control device 4 may also be referred to as an integrated control device.

[0010] Each of the plurality of switching control devices 3 includes a switching unit 5 and a switching control unit 6, as shown in FIG.

[0011] The switching unit 5 has one or more switching elements and performs switching operations to turn the switching elements on or off at predetermined timing. More specifically, the switching unit 5 has an inverter, a converter, a transformer, etc., and converts DC / AC, voltage, current, frequency, number of phases, etc., while suppressing power loss. The above-mentioned switching elements are provided in, for example, the inverter or converter.

[0012] The switching control device 3 is a power conversion device that converts DC voltage generated by a renewable energy power generation facility such as a photovoltaic (PV) power generation device into AC voltage. This type of power conversion device is also called a power conditioner (PCS: Power Conditioning Subsystem). Note that the power conversion device may have a mode for converting DC voltage to AC voltage and a mode for converting AC voltage to DC voltage.

[0013] Fig. 2 is a detailed block diagram of the switching control device 3 shown in Fig. 1. Each of the multiple switching control devices 3 shown in Fig. 1 has the same internal configuration as that shown in Fig. 2. As shown in Fig. 2, the switching control device 3 includes a switching unit 5 that converts a DC voltage generated by, for example, a renewable energy power generation facility into an AC voltage, and a switching control unit 6.

[0014] 2, the switching control device 3 has a boost chopper circuit 11, an inverter circuit 12, a transformer 13, and a switching control unit 6. The boost chopper circuit 11 and the inverter circuit 12 configure a switching unit 5.

[0015] The boost chopper circuit 11 converts the voltage amplitude of the input DC voltage. The inverter circuit 12 converts the output voltage of the boost chopper circuit 11 into an AC voltage. The inverter circuit 12 generates the AC voltage by turning the switching unit 5 on or off based on a PWM signal generated using a carrier signal and a command signal, which will be described later. The transformer 13 converts the voltage amplitude of the AC voltage to generate a 100V commercial power supply voltage. The switching control unit 6 controls the boost chopper circuit 11 and the inverter circuit 12. The switching control unit 5 may be a semiconductor chip or discrete digital circuit component that performs digital signal processing, such as a CPU (Central Processing Unit) or DSP (Digital Signal Processor), or may be a semiconductor chip or discrete component that performs analog signal processing.

[0016] Each of the multiple switching control devices 3 shown in Fig. 1 performs switching control to turn on or off the corresponding switching unit 5 at a predetermined timing. Each switching control device 3 can individually perform switching control of the corresponding switching unit 5. The number of switching control devices 3 in the switching system 2 may be two or more, and the number of switching control devices 3 is arbitrary. In this specification, any two of the multiple switching control devices 3 will be referred to as a first switching control device 3_1 and a second switching control device 3_2.

[0017] The central control device 4 generates control information regarding the timing at which the switching control devices 3 perform switching operations based on the position information of the switching control devices 3, and supplies the control information to each switching control device 3. The central control device 4 has a control unit 7 that generates the above-mentioned control information.

[0018] For example, when a first switching control device 3_1 and a second switching control device 3_2 are connected to a central control device 4, a control unit 7 in the central control device 4 generates first control information regarding the timing at which the first switching control device 3_1 performs switching control and second control information regarding the timing at which the second switching control device 3_2 performs switching control, based on position information of the first switching control device 3_1 and position information of the second switching control device 3_2. The control unit 7 supplies the first control information to the first switching control device 3_1 and the second control information to the second switching control device 3_2. The first switching control device 3_1 performs switching control of the switching unit 5 in its own device based on the first control information generated by the control unit 7. Similarly, the second switching control device 3_2 performs switching control of the switching unit 5 in its own device based on the second control information generated by the control unit 7.

[0019] Each switching control device 3 in Figure 1 performs a switching operation and can therefore be a noise source. For example, if N switching control devices 3 are arranged in close proximity and the electromagnetic noise generated by the switching operations of each switching control device 3 is uncorrelated, the total electromagnetic noise generated by each switching control device 3 will be N times greater. On the other hand, if the switching timing of the N switching control devices 3 is the same and the waveform shape (frequency characteristics) of the electromagnetic noise generated by the switching operations are also the same, the correlation value of the electromagnetic noise generated by the switching operations of each switching control device 3 will be 1, and the electromagnetic noise will be emphasized N x N times. In this way, when the switching operation timings are aligned and the waveform shapes (frequency characteristics) of the electromagnetic noise generated by the switching operations are aligned, the electromagnetic noises will interfere with each other and create a constructive noise enhancement effect.

[0020] The central control device 4 according to this embodiment generates control information relating to the timing at which each switching control device 3 performs switching control so that electromagnetic noise generated by the multiple switching control devices 3 is not increased due to a noise enhancement effect. In this specification, the control information generated by the central control device 4 may be referred to as a control parameter.

[0021] The central control device 4 generates different control parameters for two or more switching control devices 3 that may cause a noise emphasis effect among the plurality of switching control devices 3.

[0022] The central control device 4 may include a distance measurement unit 8. The distance measurement unit 8 measures the distance between the first switching control device 3_1 and the second switching control device 3_2 based on position information of the first switching control device 3_1 and position information of the second switching control device 3_2. In this case, the control unit 7 in the central control device 4 generates first control information (first control parameter) and second control information (second control parameter) based on the distance measured by the distance measurement unit 8. More specifically, when the distance measured by the distance measurement unit 8 exceeds a predetermined limit distance, the control unit 7 makes the first control parameter and the second control parameter equal, and when the distance measured by the distance measurement unit 8 does not exceed the predetermined limit distance, the control unit 7 makes the first control parameter and the second control parameter different from each other.

[0023] Fig. 3 is a diagram showing an example of the distance between any two switching control devices 3 out of N switching control devices 3 in a switching system 2. In the example of Fig. 3, the distance between the switching control devices 3_1 and 3_2 is 0.2 km, the distance between the switching control devices 3_1 and 3_N is 20.0 km, and the distance between the switching control devices 3_2 and 3_N is 20.2 km.

[0024] The central control device 4 sets different control parameters for the switching control devices 3_1 and 3_2 that are located at a short distance, and sets the same control parameters for the switching control devices 3_2 and 3_N that are located at a long distance.

[0025] Because the switching control device 3_2 and the switching control device 3_N are distant from each other, even if the same control parameters are set, there is no risk of the electromagnetic noise generated by each switching control device 3 being reinforced. That is, because electromagnetic noise attenuates with distance, even if the timing and waveform of the electromagnetic noise generated by two switching control devices 3 that are distant from each other match, there is no risk of the combined electromagnetic noise interfering with each other and being reinforced.

[0026] On the other hand, if the same control parameters are set for two switching control devices 3 that are close to each other, the timing of electromagnetic noise generation will be the same, and the electromagnetic noises will reinforce each other, resulting in the generation of large amounts of electromagnetic noise. Therefore, the central control device 4 sets different control parameters for two switching control devices 3 that are close to each other.

[0027] In this way, the control unit 7 in the central control unit 4 can reduce the effects of electromagnetic noise by setting the control parameters of each switching control device 3 according to the distance between any two switching control devices 3 among the multiple switching control devices 3.

[0028] Furthermore, even if the number of control parameters that the control unit 7 can generate is finite, the same control parameters can be set for two switching control devices 3 that are far apart, thereby reducing the total number of control parameters set by the control unit 7.

[0029] If the speed of light, i.e., the speed of electromagnetic waves, is c, the frequency of the power supply noise is f, and the wavelength of the electromagnetic waves is λ, the propagation loss L [dB] in free space at a distance d is expressed by the following equation (1).

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[0030] In equation (1), the propagation loss L becomes 3 [dB] when the transmission power is 0.5 times, the propagation loss L = 6 [dB] when the transmission power is 0.25 times, L = 10 [dB] when the transmission power is 0.1 times, and L = 20 [dB] when the transmission power is 0.01 times.

[0031] Figure 4 shows the relationship between the distance d obtained from equation (1) and the propagation loss L. Figure 4 shows four waveforms w1 to w4 at four frequencies f = 300 kHz, 1 MHz, 3 MHz, and 10 MHz, which are frequency components of power supply noise. At any frequency, the propagation loss L increases as the distance increases.

[0032] When formula (1) is transformed into a formula in which the transmission power is multiplied by k, the following formula (2) is obtained.

number

[0033] By solving equation (2) for the distance d, we obtain the following equation (3).

number

[0034] The control unit 7 in the central control device 4 sets the distance d calculated by equation (3) as a predetermined limit distance and determines whether the distance between the two switching control devices 3 exceeds the predetermined limit distance. k is set to 0.25, for example. If the timing of switching operations of the two switching control devices 3 coincides and the electromagnetic noise waveform shapes caused by the switching operations are identical, the electromagnetic noise will be 2 x 2 = 4 times greater due to the noise enhancement effect. However, if k = 0.25, the transmission power of the two switching control devices 3 will be 1 / 4, so even if the noise enhancement effect occurs, there is no risk of the original electromagnetic noise level being exceeded.

[0035] In this way, if the distance between two switching control devices 3 exceeds the limit distance calculated by equation (3) with k=0.25, it is considered that no noise enhancement effect will occur even if these two switching control devices 3 switch at the same time and produce the same electromagnetic noise waveform shape due to their switching operations.

[0036] Each of the multiple switching control devices 3 shown in FIG. 1 is applied to, for example, a power conversion device having a switching unit 5, but the multiple power conversion devices do not necessarily have the same power conversion capacity. The larger the power conversion capacity of the power conversion device, the greater the electromagnetic noise generated by the switching control device 3. Therefore, it is desirable that the control unit 7 in the central control device 4 set control parameters taking into account not only the position information of each switching control device 3 but also the power conversion capacity.

[0037] Fig. 5 is a block diagram showing the internal configuration of each switching control device 3 in Fig. 1. As shown in Fig. 5, each switching control device 3 has a switching control unit 6 and a position information holding unit 14. The switching control unit 6 has a PWM (Pulse Width Modulation) signal generation unit 15, a compensation unit 16, and a carrier signal generation unit 17.

[0038] The PWM signal generating unit 15 generates a PWM signal for turning on or off the switching unit 5. As will be described later, the PWM signal generating unit 15 generates the PWM signal by comparing the magnitude relationship between the carrier signal generated by the carrier signal generating unit 17 and the command signal generated by the compensation unit 16.

[0039] The compensation unit 16 generates a compensation value so that the AC signal output from the switching unit 5 matches the target signal, and generates a command signal based on the compensation value. The command signal is input to the PWM signal generation unit 15.

[0040] The carrier signal generating unit 17 generates a carrier signal based on the control parameters from the central control unit 4. For example, the carrier signal generating unit 17 generates a carrier signal having at least one of a frequency and a phase according to the control parameters. The control parameters may include a signal obtained by modulating a carrier frequency, which is the frequency of the carrier signal. The central control unit 4 may also update the control parameters at preset time intervals. The carrier signal is, for example, a triangular wave signal. The carrier signal may also be a sawtooth wave signal, a sine wave signal, a rectangular wave signal, or the like, and any waveform shape is acceptable. The carrier signal generated by the carrier signal generating unit 17 is input to the PWM signal generating unit 15.

[0041] Carrier signal generating section 17 may not only control at least one of the frequency and phase of the carrier signal based on the control parameter, but also control the waveform shape or signal amplitude of the carrier signal.

[0042] The position information holding unit 14 holds the position information of the switching control device 3. The position information holding unit 14 transmits the held position information to the central control device 4.

[0043] In addition, the switching control device 3 may have a position information acquisition unit 18. The position information acquisition unit 18 acquires, by some means, the position information of the switching control device 3. The acquired position information is stored in the position information storage unit 14.

[0044] The location information acquisition unit 18 may acquire location information by receiving radio waves from a Global Navigation Satellite System (GNSS), for example. Alternatively, the location information acquisition unit 18 may acquire location information input by an operator or the like when installing the switching control device 3. Alternatively, the location information acquisition unit 18 may acquire location information input to the central control device 4 without going through the control device 3.

[0045] FIG. 6 is a timing diagram illustrating the processing operation of the PWM signal generating unit 15. The command signal w5 generated by the compensation unit 16 has a frequency approximately equal to the frequency (e.g., 50 Hz to 60 Hz) of the AC signal output by the switching unit 5. The carrier signal w6 generated by the carrier signal generating unit 17 is a signal with a much higher frequency than the command signal w5, such as a triangular wave signal. For example, the PWM signal generating unit 15 sets the PWM signal W7 to a high level when the signal amplitude of the command signal w5 is greater than that of the carrier signal w6, and sets the PWM signal W7 to a low level when the signal amplitude of the command signal w5 is equal to or less than that of the carrier signal w6. As a result, a PWM signal W7 with a variable pulse width is generated, as shown in FIG. 6.

[0046] The PWM signal W7 is used to control the on / off switching timing of the switching unit 5. The central control unit 4 controls at least one of the frequency and phase of the carrier signal w6, thereby controlling the pulse width of the PWM signal W7. This makes it possible to control the timing at which the switching unit 5 performs its switching operation, and therefore the timing at which electromagnetic noise is generated.

[0047] 7 and 8 are diagrams showing a specific example of a switching system 2 according to the first embodiment. FIG. 7 shows an example in which the switching system 2 includes three switching control devices 3_1, 3_2, and 3_3, each of which controls the switching operation of three switching units. The central control device 4 acquires position information of the three switching control devices 3_1 to 3_3, and supplies different control parameters to two adjacent switching control devices (3_1 and 3_2) and (3_2 and 3_3), and supplies the same control parameters to two distant switching control devices (3_1 and 3_3). For example, as shown in FIG. 8, the central control device generates control parameters so that the three switching units controlled by the switching control device 3_1 perform switching operations at different carrier frequencies fc1, fc2, and fc3. The central control device also generates control parameters so that the three switching units controlled by the switching control device 3_2 perform switching operations at different carrier frequencies fc4, fc5, and fc6. The central control device also generates control parameters so that the three switching units controlled by the switching control device 3_3 perform switching operations at different carrier frequencies fc1, fc2, and fc3. By using the same control parameters for the switching control devices 3_1 and 3_3, the total number of control parameters can be reduced.

[0048] As described above, in the first embodiment, the central control device 4 connected to the multiple switching control devices 3 generates control parameters for each switching control device 3 based on position information of the multiple switching control devices 3. This prevents the electromagnetic noise generated by each switching control device 3 from enhancing each other. In particular, the central control device 4 measures the distance between any two of the multiple switching control devices 3, and switches between supplying the same control parameters to the two switching control devices 3 or supplying different control parameters to each of the two switching control devices 3 depending on whether the distance exceeds a predetermined limit distance. This makes it possible to reliably prevent the noise enhancement effect with a small number of control parameters.

[0049] (Second embodiment) In the first embodiment, an example was shown in which the central control device 4 controls all switching control devices 3 in the switching system 2, but there may be another switching control device 3 that is not under the control management of the central control device 4 near multiple switching control devices 3 controlled by the central control device 4.

[0050] Fig. 9 is a block diagram showing a schematic configuration of a switching system 2a according to the second embodiment. The switching system 2a in Fig. 9 includes a plurality of switching control devices 3_1, 3_2, and 3_3 under the control and management of a central control device 4, one or more external devices not under the control and management of the central control device 4, and an estimation unit 19. The external devices are noise sources whose noise patterns do not change to a certain extent, and are referred to as switching control devices 3_4, 3_5, and 3_6 in this specification and in Fig. 9.

[0051] The central control device 4 transmits control parameters individually to the multiple switching control devices 3_1, 3_2, and 3_3 under its control, and can control the timing of the switching control performed by each of the switching control devices 3_1, 3_2, and 3_3. On the other hand, the central control device 4 cannot transmit control parameters to the switching control devices 3_4, 3_5, and 3_6 that are not under its control, and therefore cannot control the timing of the switching operations of the switching control devices 3_4, 3_5, and 3_6.

[0052] The number of switching control devices 3_1, 3_2, 3_3 whose switching operation timings can be controlled by the central control device 4 and the number of switching control devices 3_4, 3_5, 3_6 whose switching operation timings cannot be controlled by the central control device 4 are arbitrary.

[0053] The estimation unit 19 estimates position information and control parameters of the switching control devices 3_4, 3_5, and 3_6 that are not under the control and management of the central control device 4. The control parameter to be estimated is, for example, the frequency of the carrier signal of the switching control devices 3_4, 3_5, and 3_6 (hereinafter referred to as carrier frequency). The position information of the switching control devices 3_4, 3_5, and 3_6 can be acquired, for example, by receiving radio waves from GNSS when measuring power supply noise.

[0054] The switching control devices 3_4, 3_5, and 3_6 generate electromagnetic noise at frequencies near integer multiples of the carrier frequency. Therefore, the estimation unit 19 measures the electromagnetic noise generated near the switching control devices 3_4, 3_5, and 3_6, and can estimate the carrier frequency from the frequency characteristics of the waveform of the measured electromagnetic noise. The central control device 4 generates control parameters for the switching control devices 3_1, 3_2, and 3_3 based on the position information of each switching control device 3_4, 3_5, and 3_6 estimated by the estimation unit 19 and the carrier frequency used by each switching control device 3_4, 3_5, and 3_6.

[0055] Fig. 10 is a diagram showing the distance between any two of the switching control devices 3 (3_1 to 3_6) in the switching system 2a of Fig. 9. Fig. 11 is a diagram showing the carrier frequency included in the control parameters of the switching control device 3 estimated by the estimation unit 19.

[0056] 11, it can be seen that the switching control devices 3_4 and 3_5 use carrier frequency f1, and the switching control device 3_6 uses carrier frequency f2. Here, since the switching control device 3_3 is close to the switching control device 3_6, it sets carrier frequency f1 different from the carrier frequency f2 of the switching control device 3_6. Furthermore, since the switching control device 3_1 is close to the switching control devices 3_4 and 3_5 but far from the switching control devices 3_3 and 3_6, it sets carrier frequency f2 different from the carrier frequencies of the switching control device 3_4 and 3_5 but the same as the carrier frequency f2 of the switching control device 3_6. Since the switching control device 3_2 is close to the switching control devices 3_1, 3_4, and 3_5, it sets carrier frequency f3 different from these carrier frequencies.

[0057] As described above, in the second embodiment, when there are switching control devices 3_4 to 3_6 that are not under the control management of the central control device 4, the estimation unit 19 estimates the position information and control parameters of the switching control devices 3_4 to 3_6 and sends the estimated information to the central control device 4. As a result, the central control device 4 controls the switching control devices 3 that are located close to the switching control devices 3_4 to 3_6 so that they do not use the carrier frequency used by the switching control devices 3_4 to 3_6. As a result, even when there are switching control devices 3_4 to 3_6 that are not under the control management of the central control device 4, it is possible to prevent the other switching control devices 3_1 to 3_3 from producing a noise emphasis effect, and it is possible to reduce the electromagnetic noise generated from the switching system 2a overall.

[0058] [Note] [Item 1] A control device comprising: a control unit that generates first control information regarding the timing at which the first switching control device performs switching control and second control information regarding the timing at which the second switching control device performs switching control based on position information of the first switching control device and position information of the second switching control device. [Item 2] The control device according to item 1, wherein the control unit determines the timing at which the first switching control device and the second switching control device perform switching control based on position information of the first switching control device and position information of the second switching control device. [Item 3] 3. The control device according to item 1 or 2, wherein the control unit supplies the first control information to the first switching control device and supplies the second control information to the second switching control device. [Item 4] a distance measurement unit that measures a distance between the first switching control device and the second switching control device based on position information of the first switching control device and position information of the second switching control device; 4. The control device according to any one of items 1 to 3, wherein the control unit generates the first control information and the second control information based on the distance measured by the distance measurement unit. [Item 5] The control device described in item 4, wherein the control unit makes the first control information and the second control information equal when the distance measured by the distance measurement unit exceeds a predetermined limit distance, and makes the first control information and the second control information different from each other when the distance measured by the distance measurement unit does not exceed a predetermined limit distance. [Item 6] The control device according to item 5, wherein the distance measurement unit calculates the predetermined limit distance d based on the following equation (4), where c is the speed of light, f is the frequency of power supply noise, and k times the transmission power is the loss of transmission power.

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[0059] The aspects of the present disclosure are not limited to the individual embodiments described above, but include various modifications that may be conceived by those skilled in the art, and the effects of the present disclosure are not limited to the above-described contents. In other words, various additions, modifications, and partial deletions are possible within the scope of the conceptual idea and spirit of the present disclosure, which is derived from the contents defined in the claims and their equivalents. [Explanation of symbols]

[0060] 1 control device, 2 switching system, 2a switching system, 3 switching control device, 4 central control device, 5 switching unit, 6 switching control unit, 7 control unit, 8 distance measurement unit, 11 boost chopper circuit, 12 inverter circuit, 13 transformer, 14 position information holding unit, 15 PWM signal generation unit, 16 compensation unit, 17 carrier signal generation unit, 18 position information acquisition unit, 19 estimation unit

Claims

1. a control device comprising: a control unit that generates first control information regarding the timing at which the first switching control device performs switching control based on position information of a first switching control device and position information of a second switching control device; and that generates second control information regarding the timing at which the second switching control device performs switching control based on the position information of the first switching control device and position information of the second switching control device.

2. 2. The control device according to claim 1, wherein the control unit determines timings at which the first switching control device and the second switching control device perform switching control based on position information of the first switching control device and position information of the second switching control device.

3. The control device according to claim 1 , wherein the control unit supplies the first control information to the first switching control device and supplies the second control information to the second switching control device.

4. a distance measurement unit that measures a distance between the first switching control device and the second switching control device based on position information of the first switching control device and position information of the second switching control device; The control device according to claim 1 , wherein the control unit generates the first control information and the second control information based on the distance measured by the distance measurement unit.

5. 5. The control device according to claim 4, wherein the control unit makes the first control information and the second control information equal when the distance measured by the distance measurement unit exceeds a predetermined limit distance, and makes the first control information and the second control information different from each other when the distance measured by the distance measurement unit does not exceed the predetermined limit distance.

6. 6. The control device according to claim 5, wherein the distance measurement unit calculates the predetermined limit distance d based on the following equation (1), where c is the speed of light, f is the frequency of power supply noise, and k times the transmission power is a loss of transmission power: [Equation 1]

7. an estimation unit that estimates position information of a third switching control device that is not under the control management of the control device and third control information related to timing of performing switching control of the third switching control device, 2. The control device according to claim 1, wherein the control unit generates the first control information and the second control information based on position information of the third switching control device estimated by the estimation unit and the third control information.

8. The control device according to claim 7 , wherein the estimation unit estimates the third control information based on a frequency that is an integer multiple of a carrier frequency of the third switching control device.

9. 2. The control device according to claim 1, wherein the control unit sets the first control information and the second control information according to a frequency f of power supply noise in each of the first switching control device and the second switching control device so that the amount of electromagnetic noise generated satisfies the following first condition, second condition, third condition, or fourth condition. Condition 1: If 150kHz≦f≦490kHz, then 13.5dBuA / m or less. Condition 2: If 490kHz <f≦3.95MHz, then 3.5dBuA / m or less. Condition 3: If 3.95MHz<f≦20MHz, then -11.5dBuA / m or less. Condition 4: If 20MHz<f≦30MHz, then -21.5dBuA / m or less.

10. 2. The control device according to claim 1, wherein the control unit controls at least one of a frequency or a phase of a first carrier signal used for switching control by the first switching control device, and controls at least one of a frequency or a phase of a second carrier signal used for switching control by the second switching control device, based on position information of a first switching control device and position information of a second switching control device.

11. the first control information includes at least one of information on a frequency or a phase of the first carrier signal, The control device according to claim 10 , wherein the second control information includes at least one of information on a frequency and a phase of the second carrier signal.

12. 2. The control device according to claim 1, wherein the control unit generates the first control information based on a power conversion capacity of the first switching control device, and generates the second control information based on a power conversion capacity of the second switching control device.

13. The control device according to claim 1 , wherein the first switching control device and the second switching control device perform switching control of a power conversion device that converts a DC voltage generated by a renewable energy power generation facility into an AC voltage.

14. a first switching control device that controls the switching of the first switching unit; a second switching control device that controls the switching of the second switching unit; an integrated control device that generates first control information regarding timing at which the first switching control device performs switching control based on position information of the first switching control device and position information of the second switching control device, and that generates second control information regarding timing at which the second switching control device performs switching control based on position information of the first switching control device and position information of the second switching control device, the first switching control device performs switching control of the first switching unit based on the first control information; The second switching control device controls the switching of the first switching unit based on the second control information.

15. the first switching control device has a first holding unit that holds position information of the first switching control device; the second switching control device has a second holding unit that holds position information of the second switching control device; The switching system of claim 14, wherein the integrated control device generates the first control information and the second control information based on the position information held in the first holding unit and the position information held in the second holding unit.

16. the first switching control device has a first acquisition unit that acquires position information of the first switching control device; the second switching control device has a second acquisition unit that acquires position information of the second switching control device, the first storage unit stores the location information acquired by the first acquisition unit; The switching system according to claim 15 , wherein the second storage unit stores the position information acquired by the second acquisition unit.

17. The switching system according to claim 16 , wherein the first acquisition unit and the second acquisition unit acquire location information by receiving radio waves from a Global Navigation Satellite System (GNSS).

18. the first acquisition unit acquires location information of the first switching control device when the first switching control device is installed; The switching system according to claim 16 , wherein the second acquisition unit acquires the location information of the second switching control device when the second switching control device is installed.

19. a third switching control device that is not under the control of the integrated control device; an estimation unit that estimates position information of the third switching control device and third control information related to timing of performing switching control of the third switching control device, The switching system according to claim 14, wherein the integrated control device generates the first control information and the second control information based on the position information of the third switching control device estimated by the estimation unit and the third control information.

20. A control method comprising: generating first control information regarding the timing at which a first switching control device performs switching control based on position information of a first switching control device and position information of a second switching control device; and generating second control information regarding the timing at which the second switching control device performs switching control based on the position information of the first switching control device and position information of the second switching control device.

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