JP2018088784A - Output control system and method for output control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reducing disadvantage occurring when in-house power demand varies during the time when output is suppressed.SOLUTION: An output control system provided with: a solar cell module for photovoltaic generation; a power conditioner outputting generated power; an output control device for controlling output of the generated power by controlling the power conditioner; and a power measuring device for measuring surplus power being a difference between the generated power and in-house load consuming thereof. The output control system has a control mode for gradually controlling according to a specification contracted by an electric power company, and a control mode for rapidly controlling power generation when in-house power demand varies.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an output control system and an output control method.

  Due to the widespread use of solar power generation systems, there is a situation where the power generated by solar power exceeds the power demand in the jurisdiction of each power company. Under such circumstances, a ministerial decree and related notifications were revised in January 2015 to revise a part of the Enforcement Regulations for the Special Measures for Renewable Energy Measures. It became the target of output control. For this reason, as a condition for systematic cooperation of the photovoltaic power generation system, the electric power company is required to be able to control the photovoltaic power generation output. In addition, as a specification for output control, there is a method in which power generation information describing the amount of power generation for each month and day is stored as schedule data in a server of an electric power company, and this is downloaded by each solar power generation system to control power generation output. It is being considered. Patent Document 1 is an example of effectively utilizing power that is wasted by output control. In a solar power generation system having an electric water heater, when the output of the solar power generation system is limited due to output suppression, if it is determined that the electric water heater can be heated, the electric water heater is heated, The output suppression of the solar power generation system is canceled, and the generated power that is wasted when the output is suppressed is effectively utilized as the power used by the electric water heater.

JP2015-106937A

  When the output control is performed, the power generation output is suppressed, and the power that can be generated is discarded, and there is a possibility that power that is not effectively used, that is, wasted power.

  In the power generation patent document 1, when the time zone in which the output is suppressed is known in advance, surplus power is consumed by the electric water heater during that period, or the surplus power is stored by controlling the storage battery, and in another time zone. By using the electric power, it is possible to effectively use the generated electric power.

  However, if the power demand in the house changes while the power generation output is being suppressed, it is an unpredictable power demand, so the power shortage will use the power supplied from the commercial system, and there is surplus power. Nevertheless, there is a disadvantage to the user.

  Even if the power generation output is being suppressed, if the in-house power consumption exceeds the generated power, the power generation amount of the power conditioner should be adjusted according to the in-house demand power so that it is not necessary to use the power supplied from the commercial grid. It must be possible to control.

  On the other hand, when performing output control, in order to minimize the influence on the commercial system, it is necessary to perform power suppression and release control gradually in accordance with specifications determined by the power company.

  If the power demand in the home changes and the power generation amount of the power conditioner is controlled, if the output of the power conditioner is controlled gently, the power shortage will be lost until the power generation power of the power conditioner catches up with the demand power. There is a problem in that a user is disadvantaged even though surplus power exists because power supplied from the grid is used.

  In the present invention, in order to solve the above problems, a solar cell module that performs solar power generation, a power conditioner that outputs generated power, an output control device that controls the power conditioner and performs output control of the generated power, and A power measuring device that measures surplus power, which is a difference between the generated power and the power consumed by the home load that consumes the power, and a control mode that gently controls according to specifications determined by the power company, And a control mode for controlling the amount of power generation at a high speed when there is a change.

  According to the present invention, even when the power demand in the house changes during the period when the output is suppressed, there is an output control instruction by controlling the power generation amount at high speed according to the power demand. It is possible to minimize user penalties that may occur during the period.

Configuration diagram of output control system of first embodiment relating to the present invention Explanatory diagram of conventional output control operation Explanatory diagram of output control operation according to the present invention Operation flow diagram of control relating to the present invention The block diagram of the output control system of 2nd Example regarding this invention

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram of an output control system according to a first embodiment of the present invention.

  FIG. 1 shows a solar cell module 1, a power conditioner 2, a commercial system 3, a power measuring device 4, an output control device 5, an in-home load 6, a public network 7, an output control information distribution server 8, and a sensor for measuring an AC voltage. 9a includes a sensor 9b for measuring an alternating current.

  The solar cell module 1 converts light into electric power and inputs the output to the power conditioner 2.

  The power conditioner 2 includes a power conversion unit 20 that converts DC power output from the solar cell module 1 into AC power, a communication unit 21 that communicates with an external device, and a control unit that controls the power conversion unit 20. 22. A measurement unit 23 for measuring the power converted by the power conversion unit 20 is provided, and the DC power output from the solar cell module 1 is converted into AC power and output. The electric power output from the power conditioner 2 is consumed by the home load 6, and the surplus electric power flows backward to the commercial system 3.

  The power measuring device 4 includes a communication unit 40 for communicating with an external device, a sensor 9a that measures an AC voltage, and a measurement unit 41 that measures power by acquiring information from a sensor 9b that measures an AC current.

  The output control device 5 includes a communication unit 51 for communicating with the power conditioner 2 and the power measurement device 4, a measurement value acquisition unit 52 for acquiring measurement values from the power conditioner 2 and the power measurement device 4 through communication, and the public. A server communication unit 53 for communicating with the output control information distribution server 8 via the network 7, output control information 50, and an output suppression control instruction unit 54 that instructs suppression of power generation output (hereinafter also referred to as output suppression). .

  The output control information 50 is transmitted from the server communication unit 53 via the public network 7 by the output control device 5.

Obtained from the output control information distribution server 8 or set statically.

  The output control information 50 is information having a time and an output control value (%) at that time.

  The output control device 5 performs output control of the power conditioner 2 based on the current time information and the output control information 50.

  The output control device 5 acquires the generated power from the power conditioner 2 and the surplus power from the power measurement device 4. During the output suppression, the output control device 5 determines the power conditioner 2 based on the generated power, the surplus power, and the output suppression generated power. Perform output control.

  Next, operations during output control will be described with reference to FIGS.

  2 and 3, the vertical axis represents power, the horizontal axis represents time, and generated power and demand power.

  A conventional operation will be described with reference to FIG. The output control device 5 does not suppress the output of the power conditioner 2 during a period when there is no output suppression instruction. However, when the output suppression start time comes, the output control device 5 is fixed according to the specifications of the power company based on the output control information 50. Is controlled so as to suppress the output of the power conditioner 2 in a certain output control period. Similarly, when the output suppression end time is reached, control is performed so as to release the output of the power conditioner 2 in a certain output control period.

  In addition, as shown in the in-house demand change period of FIG. 2, when the in-house power demand changes while the output is suppressed and the in-house power consumption exceeds the generated power, the output of the power conditioner 2 is increased to compensate for the shortage of power. Control as follows.

  However, even when control is performed to increase the output of the power conditioner 2, the power is supplied from the commercial system 3 as indicated by the shaded area in FIG. 2 until the output of the power conditioner 2 catches up with the demand power. There is a possibility that there will be a period of using power.

  When the output control of the inverter 2 is performed, if the output is controlled at the same speed as when the output suppression is started or ended, the load follow-up period is long. There is a possibility that the user may be disadvantaged because there is a period of using the power.

  Next, the operation of the present invention will be described with reference to FIG.

  In the present invention, the output control device 5 performs conventional control for the output control starting from the output suppression start time and the output suppression end time, but the power demand in the home changes during the output suppression, and the power consumption in the home Is higher than the generated power (part A in FIG. 3), or when the surplus power is present (part B in FIG. 3) and the power generated by the power conditioner is greater than the power generated at the time of output suppression, The power generation output of the power conditioner is controlled at high speed so that it is the same as the electric power. In other words, in the output control device 5, when the power consumption exceeds the generated power during the output control and the insufficient power is compensated by increasing the generated power by changing the output control amount, the change in the generated power is changed at high speed. In the state where the generated power is increased by the first control to be performed and the first control means, when the power consumption is reduced and the generated surplus power is canceled by reducing the generated power by changing the output control amount, The second control for changing the change in the generated power at high speed can be performed.

  The output control device 5 controls the power conditioner 2 during output suppression at a high speed, and shortens the load follow-up period as compared with the conventional case as shown in FIG. Can do. By eliminating the need to use the power supplied from the commercial system 3, it is possible to eliminate the disadvantage of the user.

  Further, when the output control amount is changed by changing the output control instruction value by the power company, the third control for changing the generated power at a lower speed than the first control means and the second control means can be performed.

  Next, the output control operation of the present invention will be described with reference to FIG.

  The output suppression instruction unit 54 of the output control device 5 acquires the output suppression value from the output control information 50 in step S001. The output suppression value takes a value of 0 to 100%. When 0%, power generation is stopped, and when 100%, output suppression is not performed. 1-99% represents suppressing the electric power generation output of the power conditioner 2 to the ratio of an output suppression value.

If the output suppression value is 100% as a result of determining the output suppression value in step S002, the output suppression instruction unit 54 of the output control device 5 performs normal control on the output suppression cancellation control of the power conditioner 2 in step S003. To do. Normal control refers to gradual control. By this output suppression release control, the output control device 5 transits from the output suppression state to the steady state. If the output control value is less than 100%, the generated power at the time of output suppression is calculated in step S004, and the generated power is acquired from the power conditioner 2 in step S005.
The output suppression instruction unit 54 of the output control device 5 determines whether or not the output is being suppressed in step S006. If the output is not being suppressed, the output of the power conditioner 2 is set so that the generated power becomes the generated power when the output is suppressed in step S007. Output suppression control is performed by normal control. By this output suppression control, the output control device 5 transits from the steady state to the output suppressing state. As a result of determining whether or not output control is being performed in step S006, if output suppression is being performed, surplus power is acquired from the power measuring device 4 in step S008. If the surplus power is 0 or more in step S009, that is, if the generated power exceeds the power consumption, it is determined whether the generated power acquired from the power conditioner 2 is larger than the generated power at the time of output suppression in step S005. If the generated power acquired from the power conditioner 2 is larger than the generated power at the time of output suppression determined in S010, the output of the power conditioner 2 is controlled at high speed so that the surplus power becomes 0 in step S011.

  When the surplus power is less than 0 in step S009, that is, when the power consumption exceeds the generated power, the output suppression instruction unit 54 of the output control device 5 sets the power conditioner so that the surplus power becomes 0 in step S011. 2 output is controlled at high speed.

  The output control system has two or more changing speeds of normal control and high-speed control for gently controlling the power generated by the output control.

Normal control, which is gentle control, is, for example, constant rate of change control: 100% / (5-10 minutes)
For lamp control: (control step) 5 minutes: 10% / 30 seconds (minimum), 10 minutes: 10% / 1 minute (maximum)
It is.

  High-speed control is, for example, control at a change rate that is equal to or higher than the change rate of normal control.

  The first embodiment of the present invention is characterized in that the control speed is changed by changing the change cycle of the output control value for controlling the power conditioner 2 from the output control device 5. By sending the output control value from the output control device 5 to the power conditioner 2 with a cycle shortened, the control speed for output control by the control unit 22 is increased, and conversely, the output control value is made longer and the power conditioner is made longer. 2, it is possible to change the control speed by slowing down the control speed for output control by the control unit 22.

  FIG. 5 is a block diagram of the output control system of the second embodiment of the present invention.

  FIG. 5 shows a solar cell module 1, a power conditioner 202, a commercial system 3, a power measuring device 4, an output control device 205, a residential load 6, a public line network 7, an output control information distribution server 8, and a sensor for measuring an AC voltage 9a includes a sensor 9b for measuring an alternating current.

  In FIG. 5, the control unit 222 of the power conditioner 202 includes a high-speed control unit 231 and a normal control unit 232 that are two or more generated power control units having different generated power changing speeds. Here, the normal control unit is a part that performs gentle control.

  The second embodiment of the present invention controls which one of the high-speed control unit 231 and the normal control unit 232 provided in the power conditioner 202 according to a desired generated power speed from the output control device 205 and the normal control unit 232. This is characterized in that the control speed, which is the power generation speed, is changed by changing (selecting) the above. Other operations are the same as those in the first embodiment.

DESCRIPTION OF SYMBOLS 1 Solar cell module 2 Power conditioner 202 Power conditioner 20 Power conversion part 21 Communication part 22 Control part 222 Control part 231 High-speed control part 232 Normal control part 23 Measurement part 3 Commercial system 4 Power measuring device 40 Communication part 41 Measurement part 5 Output control device 205 Output control device 50 Output control information 51 Communication unit 52 Measurement value acquisition unit 53 Server communication unit 54 Output suppression instruction unit 6 Home load 7 Public line network 8 Output control information distribution server 9a AC voltage sensor 9b AC current sensor

Claims (4)

  A solar cell module that performs solar power generation, a power conditioner that outputs generated power, an output control device that controls output of the generated power by controlling the power conditioner, the generated power and a residential load that consumes the generated power Power measurement device that measures the surplus power that is the difference from the power consumption by the power supply, control mode that controls gently according to the specifications decided by the power company, and control the amount of power generation at high speed when the demand for residential power changes An output control system.   2. The output control system according to claim 1, wherein a change rate of generated power is controlled by varying a control cycle for controlling the power conditioner from the output control device. 3.   2. The output control system according to claim 1, wherein the power conditioner includes two or more generated power control units having different changing speeds of the generated power, and the power conditioner receives the power conditioner according to a desired generated power speed. An output control system comprising: selecting a generated power control means for controlling the generated power speed.   When the output control system according to claim 1 or 2 is used, the power consumption exceeds the generated power during output control, and the shortage of power is compensated by increasing the generated power by changing the output control amount. In the first control for changing the change at high speed and the state in which the generated power is increased by the first control, the power consumption decreases, and the generated surplus power is reduced by changing the output control amount. If the output control amount is changed by changing the output control instruction value by the power company, the second control for changing the change in the generated power at a high speed is slower than the first control and the second control. And a third control for changing the generated power in the output control method.

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