JP6522883B2 - Device with communication function, inverter device, and method of starting communication with other devices - Google Patents

Description

  The present invention relates to a device provided with a communication function for communicating with another device, an inverter device, and a method by which these devices initiate communication with another device.

  In recent years, research on distributed power sources using natural energy such as sunlight has been advanced. Generally, a distributed power supply is connected to a power system to reversely flow generated power to the power system. In this case, the distributed power supply performs power adjustment by controlling the output current using the phase of the system voltage of the power system as its own internal phase (for example, see Patent Document 1).

  On the other hand, when the power system suffers a long-term power failure due to a disaster or when there is no power system on a remote island, the distributed power supply does not need to be connected to the power system and it is necessary to perform a self-sustaining operation. In this case, since the distributed power supply can not detect the phase from the system voltage of the electric power system, it oscillates the internal phase by itself and performs output voltage control using this.

  FIG. 6 is a diagram for explaining a conventional distributed power supply A 'performing a self-sustaining operation.

  The distributed power supply A ′ converts DC power output from the DC power supply 1 into AC power by the inverter circuit 2 and outputs the AC power to the load L. The control circuit 3 ′ controls the inverter circuit 2, generates a PWM signal based on signals detected by each sensor provided in the distributed power supply A ′, and outputs the PWM signal to the inverter circuit 2. The control circuit 3 ′ includes an internal phase generation unit 31 ′, a command signal generation unit 32, a PWM signal generation unit 33, and a communication unit 34. The internal phase generation unit 31 ′ generates an internal phase θ and outputs the internal phase θ to the command signal generation unit 32. The command signal generation unit 32 generates a command signal using the internal phase θ, and outputs the command signal to the PWM signal generation unit 33. The PWM signal generator 33 generates a PWM signal based on the command signal input from the command signal generator 32 and outputs the PWM signal to the inverter circuit 2.

As shown in FIG. 6, in the case of a power system in which a plurality of distributed power supplies A 'are connected in parallel, it is necessary to synchronize the internal phase θ of each distributed power supply A'. Therefore, the monitoring device C for centrally monitoring each distributed power supply A ′ has a function to synchronize the internal phase θ of each distributed power supply A ′. That is, the communication unit 34 transmits the internal phase θ generated by the internal phase generation unit 31 ′ of each distributed power supply A ′ to the monitoring device C. The monitoring device C calculates, for example, an arithmetic mean value (arithmetic average value) of the received internal phase θ of each dispersed power source A ′, and transmits it to each distributed power source A ′ as a target internal phase θ ^* . The internal phase generation unit 31 'controls the internal phase θ to be the target internal phase θ ^* . Alternatively, one distributed power supply A '(master) substitutes for the monitoring device C and outputs the target internal phase θ ^* to the other distributed power supply A' (slave).

  However, when the internal phase θ is synchronized by these methods, the system becomes bulky, it is difficult to flexibly cope with the increase and decrease of the distributed power supply A ', and there is a problem that the system is vulnerable to failure. As a method for solving these problems, the inventors developed the invention described in Japanese Patent Application No. 2013-154536. According to the present invention, each distributed power supply included in the power system transmits and receives the internal phase to at least one other distributed power supply, and uses an operation result based on the generated internal phase and the received internal phase. To generate By performing this process in each of the distributed power sources, the internal phase of each distributed power source converges to the same value. Therefore, the internal phase of each distributed power supply can be synchronized while solving the above problems.

JP, 2010-68630, A

Reza Olfati-Saber, J. Alex Fax, and Richard M. Murray, "Consensus and Cooperation in Networked Multi-Agent Systems", Proceedings of the IEEE, Vol. 95, No. 1, (2007) Mehran Mesbahi and Magnus Egerstedt, "Graph Theoretic Methods in Multiagent Networks", Princeton (2010)

  However, in the present invention, when a new distributed power supply is added to the power system to start communication, there arises a problem that the internal phase synchronization of the distributed power supply included in the power system is disturbed. That is, since the internal phase of the added distributed power supply is not synchronized with the internal phase of the distributed power supply included in the power system, when the added distributed power supply starts communication, it is included in the power system. The distributed power supply also performs processing to synchronize the internal phase, including the added distributed power supply. As a result, the internal phases that have been synchronized change, and the internal phases are not synchronized until they are synchronized again.

  The present invention has been conceived under the above-mentioned circumstances, and it is an object of the present invention to provide a method for initiating communication and an apparatus for performing the method, which can solve the above-mentioned problems. .

  In order to solve the above-mentioned subject, in the present invention, the following technical measures are taken.

  The device provided by the first aspect of the present invention comprises internal value generation means for generating an internal value, and communication means for communicating with at least one other device, said internal value generation means comprising The internal value is generated using an operation result based on the internal value received and the internal value received by the communication means from the other device, and the communication means starts communication with the other device. Only after receiving from another device, the internal value generated by the internal value generation unit is transmitted to the other device after the internal value matches the internal value of the other device. I assume.

  In a preferred embodiment of the present invention, the internal value generation means integrates operation means for performing an operation based on the generated internal value and the received internal value, and integrates the operation result output from the operation means. And integrating means for calculating an internal value.

  In a preferred embodiment of the present invention, the calculation means calculates the calculation result by subtracting the generated internal value from the received internal value and adding all subtraction results.

  In a preferred embodiment of the present invention, the communication means starts transmitting the generated internal value when the calculation result by the calculation means becomes zero.

  In a preferred embodiment of the present invention, the communication means starts transmission of the generated internal value when a state in which the calculation result by the calculation means is zero continues for a predetermined time or more.

  An inverter device provided by the second aspect of the present invention is a device provided by the first aspect of the present invention, further comprising an inverter circuit, wherein the internal value generation means controls the inverter circuit. Generating an internal phase used as an internal value.

  According to a third aspect of the present invention, there is provided a method, wherein a plurality of devices, each having an internal value generation means for generating an internal value and a communication means for performing communication, transmit and receive the internal value through communication. In a system in which internal values are matched, a method in which the device newly added to the system starts communication with devices included in the system, the newly added device A first step of receiving only internal values transmitted from the devices included in the system, an internal value generated by the internal value generation means, and an internal value received in the first step; Performing a second step of generating an internal value and a third step of determining whether the generated internal value matches the received internal value, using the calculation result based on Matched in the third step Later discriminated, the internal value said product, characterized by a fourth step further possible to perform the to be transmitted to the device included in the system.

  According to the present invention, the internal value generation unit generates an internal value using a calculation result based on the generated internal value and the internal value of another device received by the communication unit. As the internal value generation means of each device does this, the internal values of all the devices converge to the same value. Each device only needs to communicate with at least one device (for example, one located nearby or one with which communication has been established), and one device or monitoring device needs to communicate with all other devices There is no. Also, when communication is started with another device, when communication is started, only reception from the other device is performed. Therefore, the internal values generated by the internal value generation means do not affect the generation of the internal values of other devices. Therefore, even if the communication means starts communication, the coincidence of the internal values of the other devices will not be disturbed.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a figure for demonstrating the distributed power supply which concerns on 1st Embodiment. It is a figure which shows the electric power system in which multiple distributed power supplies which concern on 1st Embodiment were connected in parallel. It is a flowchart for demonstrating the transmission control processing which a transmission control part performs. It is a figure which shows the simulation result of the change of the internal phase of each distributed power supply in an electric power system. It is a figure for demonstrating the change of a communication state when adding a distributed power supply newly in the electric power system shown in FIG. It is a figure for demonstrating the conventional distributed power supply which performs a self sustaining.

  An embodiment of the present invention will be specifically described below with reference to the drawings, taking an example where the device according to the present invention is a distributed power supply inverter device.

  FIG. 1 is a diagram for explaining the distributed power supply according to the first embodiment. FIG. 2 is a diagram showing a power system in which a plurality of distributed power supplies according to the first embodiment are connected in parallel.

  As shown in FIG. 1, the distributed power supply A includes a DC power supply 1, an inverter circuit 2, and a control circuit 3. The distributed power supply A converts the DC power output from the DC power supply 1 into AC power by the inverter circuit 2 and outputs the AC power. Although not shown, a transformer is provided on the output side of the inverter circuit 2 to step up (or step down) the AC voltage. The inverter device 4 is a combination of the inverter circuit 2 and the control circuit 3 and is called a so-called power conditioner.

  The DC power supply 1 outputs DC power and includes a solar cell. A solar cell generates direct current power by converting solar energy into electrical energy. The DC power supply 1 outputs the generated DC power to the inverter circuit 2. In addition, DC power supply 1 is not limited to what produces | generates direct-current power by a solar cell. For example, the DC power supply 1 may be a fuel cell, a storage battery, an electric double layer capacitor, a lithium ion battery, a diesel engine generator, a micro gas turbine generator, a wind turbine generator, etc. It may be a device that converts it into DC power and outputs it.

  The inverter circuit 2 converts DC power input from the DC power supply 1 into AC power and outputs the AC power. The inverter circuit 2 includes a PWM control inverter and a filter (not shown). The PWM control inverter is a three-phase inverter provided with three sets of six switching elements (not shown), and switches DC power by switching on and off each switching element based on a PWM signal input from the control circuit 3. Convert to AC power. The filter removes high frequency components due to switching. The inverter circuit 2 is not limited to this. For example, the PWM control inverter may be a single phase inverter or a multilevel inverter. Moreover, it is not limited to PWM control, You may use other systems, such as phase shift control.

  The control circuit 3 controls the inverter circuit 2 and is realized by, for example, a microcomputer. The control circuit 3 generates a PWM signal based on the input voltage, the output voltage, the output current, and the like of the inverter circuit 2 detected by each sensor provided in the distributed power supply A, and outputs the PWM signal to the inverter circuit 2. The control circuit 3 includes an internal phase generation unit 31, a command signal generation unit 32, a PWM signal generation unit 33, a communication unit 34, and a transmission control unit 35.

Internal phase generating unit 31, and generates an internal phase theta _i used to generate the command signal. Details of the internal phase generation unit 31 will be described later.

The command signal generation unit 32 generates a command signal for performing output voltage control. The command signal generation unit 32 performs so-called three-phase / two-phase conversion processing (αβ conversion processing) and rotational coordinate conversion processing (dq conversion processing) on the three-phase voltage signals in which the output voltage of the inverter circuit 2 is detected. Convert to axis component and q axis component signals. The three-phase / two-phase conversion process is a process for converting a three-phase alternating current signal into an equivalent two-phase alternating current signal, an orthogonal coordinate system in which the three-phase alternating current signal is stationary (hereinafter referred to as "stationary coordinate system" Is converted into the alternating current signal of the α axis component and the alternating current signal of the β axis component by decomposing them into the components of the α axis and the β axis orthogonal to each other and adding the components of the respective axes together. Further, rotational coordinate conversion processing is processing for converting signals of two phases (α-axis component and β-axis component) of the stationary coordinate system into signals of two phases (d-axis component and q-axis component) of the rotational coordinate system. . The rotational coordinate system is an orthogonal coordinate system having orthogonal d and q axes and rotating at a predetermined angular velocity. Rotation coordinate conversion processing is performed on the basis of the internal phase theta _i input from the internal phase generating unit 31.

The command signal generation unit 32 extracts only the DC component from the d-axis component and the q-axis component of the voltage signal, separately performs control processing, and performs static coordinate conversion processing (inverse dq conversion processing) and two compensation signals. A phase / three phase conversion process (inverse αβ conversion process) is performed to convert into three compensation signals. The stationary coordinate conversion process is the reverse of the rotational coordinate conversion process, and the two-phase / three-phase conversion process is the reverse of the three-phase / two-phase conversion process. Static coordinate conversion processing is performed based on the internal phase theta _i input from the internal phase generating unit 31. Command signal generating unit 32 generates three command signals from the sine wave signal generated based on the internal phase theta _i, three compensation signal input from the internal phase generating unit 31, PWM signal generating unit Output to 33.

  The command signal generation unit 32 controls the input voltage of the inverter circuit 2, but the description thereof is omitted. In the present embodiment, the case where the distributed power source A is a three-phase system has been described, but a single-phase system may be used. In the case of a single-phase system, the command signal generation unit 32 may perform control on a single-phase voltage signal from which the output voltage of the inverter circuit 2 is detected.

  The PWM signal generator 33 generates a PWM signal. The PWM signal generation unit 33 generates a PWM signal by the triangular wave comparison method based on the carrier signal and the command signal input from the command signal generation unit 32. For example, a pulse signal which is high when the command signal is larger than the carrier signal and is low when the command signal is less than the carrier signal is generated as a PWM signal. The generated PWM signal is output to the inverter circuit 2. The PWM signal generator 33 is not limited to the case of generating the PWM signal by the triangular wave comparison method, and may generate the PWM signal by the hysteresis method, for example.

The communication unit 34 communicates with another distributed power source A. The communication unit 34 is input to the internal phase theta _i of the internal phase generating unit 31 to generate, to the communication unit 34 of the other distributed power A. The communication unit 34 also outputs the internal phase θ _j received from the communication unit 34 of another distributed power source A to the internal phase generation unit 31. The communication method is not limited, and wired communication or wireless communication may be used.

  As shown in FIG. 2, the distributed power supply A is connected in parallel with other distributed power supplies A in the power system. FIG. 2 shows a state in which five distributed power supplies A (A1 to A5) and four loads L are connected. In the actual power system, more distributed power sources A and loads L are connected, but an extremely small number of cases are shown for simplification of the description.

  Solid arrows shown in FIG. 2 indicate that mutual communication is performed. The distributed power supply A1 communicates with only the distributed power supply A2, and the distributed power supply A2 communicates with only the distributed power supply A1 and the distributed power supply A3. Further, distributed power supply A3 communicates only with distributed power supply A2 and distributed power supply A4, and distributed power supply A4 communicates only with distributed power supply A3 and distributed power supply A5. The power source A5 communicates with only the distributed power source A4. As described above, the communication unit 34 of the distributed power source A is at least one of the distributed power sources A (for example, one located in the vicinity, communication has been established among the distributed power sources A connected to the power system). State (hereinafter referred to as “connected state”) in which a communication path exists for any two distributed power sources A connected to the power system. It does not need to communicate with the communication units 34 of all the distributed power sources A connected to the power system.

For example, if the distributed power supply A is distributed power A2, the communication unit 34 transmits the internal phase theta ₂ which the internal phase generating unit 31 to generate the communication unit 34 of the distributed power supply A1 and A3, distributed power A1 receives the internal phase theta ₁ from the communication unit 34 receives the internal phase theta ₃ from the communication unit 34 of the distributed power supply A3.

The transmission control unit 35 controls the transmission function of the communication unit 34. The transmission control unit 35 outputs a transmission prohibition signal to the communication unit 34 initially when the distributed power source A is added to the power system. While being inputted to the transmission prohibition signal, the communication unit 34 does not transmit the internal phase theta _i to the communication unit 34 of the other distributed power A. That is, the communication unit 34 does not perform mutual communication but performs one-side communication of only reception. In the transmission control unit 35, when the state in which the calculation result u _i (described later) input from the internal phase generation unit 31 is “0” continues for a predetermined time, the internal phase θ _i is internal to another distributed power source A. It determines that matches the phase theta _i, stops outputting of the transmission prohibition signal. In the present embodiment, in order to exclude the case where the operation result u _i transiently becomes “0”, the condition that “0” continues for a predetermined time is a coincidence condition, but the present invention is not limited thereto. The operation result u _i may be “0” as the condition for matching. Communication unit 34, the input of the transmission inhibit signal is stopped, starts the transmission of the internal phase theta _i. That is, the communication unit 34 communicates with each other.

  FIG. 3 is a flowchart for explaining processing (hereinafter referred to as “transmission control processing”) performed by the transmission control unit 35 to control the transmission function of the communication unit 34. The transmission control process is started when the distributed power source A is added to the power system to start communication with another distributed power source A.

First, a transmission prohibition signal is output to the communication unit 34 (S1). The transmission prohibition signal is, for example, a high level signal and continues to be output until it is stopped. Next, the timer t is initialized to "0" (S2), and the calculation result u _i input from the internal phase generation unit 31 is obtained (S3). The timer t is a variable for measuring a state in which the operation result u _i is “0”.

Next, it is determined whether the calculation result u _i is “0” (S4). If the result u _i is not "0" (S4: NO), the flow returns to step S2. On the other hand, if the operation result u _i is "0" (S4: YES), the timer t whether a predetermined time has elapsed t ₀ is determined (S5). If the timer t is less than the predetermined time t ₀ (S5: NO), the flow returns to step S3. On the other hand, if the timer t is the predetermined time t ₀ or more (S5: YES), transmission inhibit signal is stopped (S6), the transmission control process ends. The transmission control process performed by the transmission control unit 35 is not limited to that described above.

  Next, details of the internal phase generation unit 31 will be described.

Internal phase generating unit 31 includes an internal phase theta _i which generated, is input from the communication unit 34, by using the internal phase theta _j other distributed power supply A, and generates an internal phase theta _i. Be different from the internal phase theta _i and the internal phase theta _j, by calculating processing within a phase generator 31 are repeated, and the internal phase theta _i and the internal phase theta _j converges to a common internal phase. As shown in FIG. 1, the internal phase generation unit 31 includes an operation unit 311, a multiplier 312, an adder 313, and an integrator 314.

The calculation unit 311 performs calculation based on the following equation (1). That is, the calculation unit 311 subtracts the internal phase θ _i generated by the internal phase generation unit 31 from each internal phase θ _j input from the communication unit 34, and multiplies all the subtraction results, and multiplies the operation result u _i Output to the output unit 312. The arithmetic unit 311 also outputs the operation result u _i to the transmission control unit 35.

For example, when the distributed power supply A is the distributed power supply A2 (see FIG. 2), the calculation unit 311 performs the calculation of the following equation (2) and outputs the calculation result u ₂ .

The multiplier 312 multiplies the operation result u _i input from the operation unit 311 by a predetermined coefficient ε and outputs the result to the adder 313. The coefficient ε is a value satisfying 0 <ε <1 / d _max and is set in advance. d _max, of the d _i communication unit 34 is a number of other distributed power A that communicates is largest one among all the distributed power supply A that is connected to the power system. That is, among the distributed power sources A connected to the power system, the number of internal phases θ _j which are in communication with the most other distributed power sources A but are input to the communication unit 34. The coefficient ε is to be multiplied by the calculation result u _i in order to suppress that the correction angular frequency ω _i becomes too large (small) and the variation of the internal phase θ _i becomes too large. Therefore, when the processing in the internal phase generation unit 31 is continuous time processing, it is not necessary to provide the multiplier 312.

The adder 313 adds the input from the multiplier 312 to a predetermined angular frequency ω ₀ and outputs the result to the integrator 314 as a corrected angular frequency ω _i . The integrator 314 integrates the corrected angular frequency ω _i input from the adder 313 to generate and output an internal phase θ _i . The integrator 314 generates an internal phase theta _i by adding the corrected angular frequency omega _i in the interior phase theta _i previously generated. Further, the integrator 314 outputs the internal phase θ _i as a value in the range of (−π <θ _i ≦ π). Incidentally, how to set the range of the internal phase theta _i is not limited to this, for example, it may be a _{(0 ≦ θ i <2π)} . Internal phase theta _i is the command signal generator 32, is output to the communication unit 34 and the arithmetic unit 311.

  In the present embodiment, the control circuit 3 is realized as a digital circuit, but may be realized as an analog circuit. Further, the processing performed by each unit may be designed as a program, and the computer may function as the control circuit 3 by executing the program. Alternatively, the program may be recorded on a recording medium and read by a computer.

In this embodiment, the internal phase generating unit 31 uses the internal phase theta _i which generated, is input from the communication unit 34, and an internal phase theta _j other distributed power A, generates an internal phase theta _i Do. If the internal phase theta _i is greater than the arithmetic mean value of each internal phase theta _j, the operation result u _i by the calculation unit 311 is output is a negative value. Then, the correction angular frequency ω _i becomes smaller than the predetermined angular frequency ω ₀ , and the amount of change of the internal phase θ _i becomes smaller. On the other hand, if the internal phase theta _i is smaller than the arithmetic mean value of each internal phase theta _j, the operation result u _i by the calculation unit 311 outputs becomes a positive value. Then, the correction angular frequency ω _i becomes larger than the predetermined angular frequency ω _{0 and} the change amount of the internal phase θ _i becomes large. That is, the internal phase theta _i approaches the arithmetic average of the internal phase theta _j. By this process is performed in each of distributed power A, the internal phase theta _i of each distributed power source A converges to the same value. The internal phase θ _i changes with time, and can be considered as a combination of a component that changes according to the angular frequency ω ₀ and a component that changes so as to compensate for the initial phase shift. That the latter converges to the same value .theta..alpha, also converge to the same value inside the phase theta _i of each distributed power source A. It is mathematically proved that the latter converges to the same value θα (see Non-Patent Documents 1 and 2). Further, the convergence value θα is, as shown in the following equation (3), it has also been demonstrated to be the arithmetic mean value of the initial value of the internal phase theta _i of each distributed power source A. n is the number of distributed power sources A connected to the power system, and the following equation (3) adds all initial values of the internal phases θ _{1 to} θ _n of the distributed power sources A ₁ to An and divides by the n It shows that the calculated arithmetic mean value is calculated.

In the present embodiment, the case where the cycle T of the process in the internal phase generation unit 31 is one second is described. When the period T is, for example, 0.1 second, the adder 313 adds the input from the multiplier 312 to a value obtained by multiplying the angular frequency ω ₀ by 1/10 (multiplied by 0.1). That is, Tω ₀ is input instead of ω ₀ .

Hereinafter, in the power system shown in FIG. 2 will be described simulation was confirmed that the internal phase theta _i converges.

The initial values of the internal phases θ _{1 to} θ ₅ of the distributed power sources A _{1 to} A ₅ are θ ₁ = π / 2, θ ₂ = 0, θ ₃ = π, θ ₄ = 3π / 2, θ ₅ = −π, respectively. The simulation was performed as / 4. FIG. 4 shows the result of the simulation, and shows the time response of each of the internal phases θ _{1 to} θ ₅ of the dispersed power sources A _{1 to} A ₅ excluding the component that changes according to the angular frequency ω _0. ing. The figure (a) is a case when synchronization of internal phase (theta) _i is not performed (namely, in the case of the structure without the calculating part 311, the communication part 34, and the transmission control part 35 shown in FIG. 1), (b), when subjected to synchronization of the internal phase theta _i (i.e., the configuration shown in FIG. 1) is of. In the figure (a), it has not changed from the initial value. On the other hand, in the figure (b), it has converged to "11 (pi) / 20" which is an arithmetic mean value of an initial value.

  Next, the operation of the transmission control unit 35 when the distributed power source A is added to the power system will be described.

When the distributed power supply A is newly added to the power system and the communication unit 34 communicates with the communication unit 34 of another distributed power supply A, when the communication unit 34 performs mutual communication from the beginning, it is included in the power system The problem arises that the synchronization of the internal phase θ _i of the distributed power supply A, which has been For example, in the power system shown in FIG. 2, when the distributed power supply A6 is newly added to the power system and the communication unit 34 communicates with the communication unit 34 of the distributed power supply A5, when the mutual communication is suddenly started, the distributed internal phase theta ₅ forms the power A5 is changed from synchronized phase. The change of the phase also spreads to the internal phases θ _{1 to} θ ₄ so that each internal phase θ _i changes from the synchronized phase. By repeating the processing in the internal phase generation unit 31 of each of the distributed power supplies A1 to A6, the same phase converges again, but when the distributed power supply A6 starts intercommunication with the distributed power supply A5 , internal phase theta _i of distributed power A1~A5 state occurs that is not consistent.

Transmission control unit 35 are initially the distributed power supply A is added to the power system, the communication unit 34 is prohibited to send internal phase theta _i to the communication unit 34 of the other distributed power A. Thus, the communication unit 34 performs one-side communication of only reception. In the case where the distributed power supply A6 is newly added to the power system and the communication unit 34 of the distributed power supply A6 communicates with the communication unit 34 of the distributed power supply A5 in the power system shown in FIG. As shown to a), it will be in the state of the one-sided communication which only transmits from distributed power supply A5 to distributed power supply A6. In this state, only the internal phase theta ₅ a distributed power A5 is transmitted to the distributed power supply A6, since distributed power A5 does not receive the internal phase theta ₆ of distributed power A6, inside the internal phase theta ₅ It does not change by the phase θ _6. Meanwhile, the internal phase theta ₆ of distributed power A6, changes by internal phase theta ₅ received from the distributed power supply A5, matching internal phase theta _5.

When the internal phase theta ₆ matches the internal phase theta _5, the operation result u ₆ becomes "0" which is calculated within the phase generating unit 31 of the distributed power supply A5. Transmission control unit 35 determines that the state operation result u ₆ is "0" when continued for a predetermined time t _0, the internal phase theta ₆ coincides with the internal phase theta _i of other distributed power A, Communication part 34 is allowed to send an internal phase theta ₆ to the communication unit 34 of the distributed power supply A5. Thus, the communication unit 34 communicates with the distributed power supply A5 (see FIG. 5B).

According to the present embodiment, the transmission control unit 35 generates the internal phase θ _i generated by the internal phase generation unit 31 after the distributed power source A is added to the power system and the communication unit 34 starts communication. until it matches the internal phase theta _i form power a, the communication unit 34 to perform the one side communication reception only. Thus, without the internal phase theta _i of other distributed power A that communicates with the distributed power supply A is affected, the internal phase theta _i of the internal phase theta _i other distributed power A of distributed power A Can be matched. Therefore, even if the communication unit 34 of the distributed power supply A starts communication, it does not disturb the synchronization of the internal phase theta _i of other distributed power A.

In the first embodiment, the component that changes so as to compensate for the shift of the initial phase of the internal phase θ _i of the distributed power source A is the addition of the initial value of the internal phase θ _i of each distributed power source A. Although the case of convergence to the average value has been described, the present invention is not limited thereto. The convergence value θα changes depending on the arithmetic expression set in the arithmetic unit 311.

For example, when the computing equation set in the computing unit 311 is the following equation (4), the convergence value θα becomes a value as shown in the following equation (5). d _i is the number of other distributed power sources A with which the communication unit 34 communicates, that is, the number of internal phases θ _j input to the communication unit 34. That is, the convergence value θα performed a weighting by number of the communication partner, a weighted average value of the initial value of the internal phase theta _i of each distributed power source A.

Further, when the arithmetic equation set in the arithmetic unit 311 is the following equation (6), the convergence value θα is the geometric mean of the initial value of the internal phase θ _i of each dispersed power source A as shown in the following equation (7) It becomes a value (geometric mean value).

Further, when the arithmetic equation set in the arithmetic unit 311 is the following equation (8), the convergence value θα is the harmonic mean of the initial value of the internal phase θ _i of each dispersed power source A as shown in the following equation (9) It becomes a value.

Further, when the arithmetic equation set in the arithmetic unit 311 is the following equation (10), the convergence value θα is the P-th order of the initial value of the internal phase θ _i of each dispersed power source A as shown in the following equation (11) It becomes an average value.

  Although the case where the internal phase of the distributed power supply A (inverter device 4) is made to coincide is described in the first embodiment, the present invention is not limited to this. The present invention can also be applied to the case of matching other phases or the case of matching predetermined internal values. The present invention can also be applied to devices (for example, measuring devices) other than the distributed power supply A (inverter device 4). That is, the present invention can be applied to the case where a plurality of devices transmit and receive internal values through communication to match the internal values.

  The device provided with the communication function according to the present invention, the inverter device, and the method of starting communication with other devices by these devices are not limited to the embodiments described above. The specific configuration of each part of the device provided with the communication function according to the present invention, the inverter device, and the method by which these devices start communication with other devices can be variously changed in design.

A, A1 to A6 Distributed power supply (apparatus)
1 DC power supply 2 inverter circuit 3 control circuit (device)
31 Internal Phase Generator (Internal Value Generator)
311 operation unit 312 multiplier 313 adder 314 integrator 32 command signal generator 33 PWM signal generator 34 communication unit (communication means)
35 Transmission control unit (communication means)
4 Inverter device (device)
L load

Claims (7)

Internal value generation means for generating an internal value which is a numerical value;
Communication means for communicating with at least one other device;
Equipped with
The internal value generating means includes an internal value raw form it was, said communication means using a calculation result based on the internal value received from the other apparatus, and generates an internal value,
The communication means is
From when the communication with the other device is started for the first time, until the internal value generated by the internal value generation means matches the internal value received from the other device for the first time, the generated internal value is used as the other device Do not send to other devices, but only receive from the other devices,
After the first match , the internal value generated by the internal value generation unit is transmitted to the other device, including when there is no match thereafter .
An apparatus characterized by The internal value generation means
Operation means for performing an operation based on the generated internal value and the received internal value;
Integration means for integrating the calculation result output from the calculation means to calculate an internal value;
Equipped with
The device of claim 1. The calculation means calculates the calculation result by subtracting each of the generated internal values from the received internal value and adding all the subtraction results.
An apparatus according to claim 2. The communication means starts transmission of the generated internal value when the calculation result by the calculation means becomes zero.
An apparatus according to claim 3. The communication means starts transmission of the generated internal value when a state in which the calculation result by the calculation means is zero continues for a predetermined time or more.
An apparatus according to claim 3. An apparatus according to any one of the preceding claims, wherein
It further comprises an inverter circuit,
The internal value generation unit generates an internal phase used to control the inverter circuit as an internal value;
An inverter device characterized by In a system in which a plurality of devices respectively provided with internal value generation means for generating an internal value which is a numerical value and communication means for performing communication make the internal values coincide by transmitting and receiving internal values through communication. A method wherein the device newly added to the system starts communication with devices included in the system for the first time ,
In the newly added device,
The device included in the system without transmitting the internal value generated by the internal value generation unit to the device included in the system from the time when communication with the device included in the system is started for the first time A first step of only receiving the internal value sent from
A second step of generating an internal value using a calculation result based on the internal value generated by the internal value generation means and the internal value received in the first step;
A third step of determining whether the generated internal value first matches the received internal value;
Let
Wherein the first time after it is determined matched with the third step, then matched, including when not, the internal value said product, further a fourth step of transmitting to the device included in the system Make it happen,
A method characterized by