JP6052545B2 - Self-sustaining operation system and method for distributed power supply - Google Patents

Self-sustaining operation system and method for distributed power supply Download PDF

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JP6052545B2
JP6052545B2 JP2013038859A JP2013038859A JP6052545B2 JP 6052545 B2 JP6052545 B2 JP 6052545B2 JP 2013038859 A JP2013038859 A JP 2013038859A JP 2013038859 A JP2013038859 A JP 2013038859A JP 6052545 B2 JP6052545 B2 JP 6052545B2
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power supply
generator
output
natural energy
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JP2014168328A (en
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山根 俊博
俊博 山根
俊雄 大山
俊雄 大山
眞澄 岡崎
眞澄 岡崎
美奈 緑川
美奈 緑川
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清水建設株式会社
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Description

  The present invention relates to a self-sustaining operation system and method for a distributed power source (microgrid).

  In recent years, efforts to “microgrid” to reduce the burden on the commercial system by load following operation of distributed power sources have become active. In an energy supply system (hereinafter simply referred to as a microgrid) that incorporates the idea of a microgrid, the power generation amount is controlled so that the amount of power purchased from a commercial system is constant by grid interconnection. There is a need for load following operation that performs system operation and performs self-sustained operation that supplies high-quality power (with small fluctuations in voltage and frequency) in the microgrid system in the event of an emergency such as a power failure.

Considering the convenience of power supply in buildings, in order to make a transition from grid-operated operation to self-sustained operation in an emergency such as a power outage without interruption, while maintaining high-quality power supply, It is desirable to construct a system with an emergency generator.
This allows the continuation of the building without any influence from external power interruptions in the microgrid system, including devices that are relatively sensitive to power quality (voltage and frequency fluctuations) such as computers. Operation becomes possible.

In recent years, natural energy such as solar power generation and wind power generation has been actively used in various fields for the purpose of CO 2 reduction. For example, as a method of effectively using photovoltaic power generation in the above-described microgrid, in an emergency such as a peak cut operation is normally performed in conjunction with a commercial power supply (commercial power supply), and the commercial power supply fails Can be used as a power source for BCP (Business Continuity Plan).

However, in the natural energy power generation using natural energy such as sunlight and wind power, the generated power greatly fluctuates due to changes in the weather and the environment.
For this reason, when power supply from a commercial power source is stopped, such as during a power outage, and autonomous operation is performed using power such as a storage battery, an emergency generator, and solar power generation, the power supplied by solar power generation is When the electric power consumed by the load in the microgrid becomes larger, a reverse power flow is generated for the emergency generator.

This reverse power flow causes an emergency stop if the emergency generator has a major failure. Thereby, solar power generation stops, electric power is no longer supplied to the load in the microgrid, and the load stops.
Therefore, there is a microgrid self-sustained operation system that detects a reverse power flow with respect to an emergency generator and stops power supply by solar power generation (see, for example, Patent Document 1).

JP 2004-48841 A

A configuration example of a conventional microgrid will be described with reference to FIG. FIG. 5 is a diagram showing a conventional example of a system configuration for performing uninterrupted power supply when a power failure occurs during commercial interconnection operation.
In the power supply system 90 shown in FIG. 5, the first circuit breaker 191 and the ACSW (AC switch) 120 are turned on and the second circuit breaker 192 is opened during the interconnection operation with the commercial power supply 200. In addition, by performing output control of the storage battery 130 via the INV (inverter) 135 in accordance with fluctuations in photovoltaic power generation and electric power load, peak cut operation is performed, the important load 150, the safety load 160, the disaster prevention load 170, and Electric power is supplied to the general load 180. The voltage detector 181 detects the power at the power receiving point R1.

  On the other hand, if the voltage detection part 181 detects the voltage of the receiving point R1 and it is detected that it is at the time of a power failure, the 1st circuit breaker 191 and the receiving point circuit breaker 201 will be open | released. Further, in the uninterruptible power supply 100B, the ACSW 120 detects a voltage drop and is opened, and the emergency generator 190 starts to start by a state signal indicating that the first circuit breaker 191 is opened. Power is supplied to the self-supporting range (A) due to disconnection. After the emergency generator 190 is started, the control unit 902 is within the range of the self-supporting range (B) by turning on the second circuit breaker 192 and the ACSW 120 and using the solar power generation output by the solar cell 140. Perform autonomous operation.

Further, if the power of the emergency generator 190 is depleted due to prolonged power failure in the power source of the commercial system (commercial power source 200), as long as the remaining amount of the storage battery 130 continues, the autonomous operation in the autonomous range (A) Will continue.
When the power value consumed by the important load is less than the photovoltaic power generation output and a reverse power flow is generated with respect to the emergency generator 190, the rotation of the generator is performed when the emergency generator 190 is not performing constant frequency control. The number rises.
The frequency detection unit 903 detects an increase in the frequency of the power output from the emergency generator 190, and outputs an output power command for decreasing the output power to the PCS 901 corresponding to this frequency. Thereby, the reverse power flow with respect to the emergency generator 190 can be restricted within a certain range.

As described above, in the conventional example, the reverse power flow is limited to the emergency generator 190 within a certain range. However, since the reverse power flow to the emergency generator 190 is not completely removed, depending on the configuration of the emergency generator 190, the emergency generator 190 causes an abnormal operation and stops due to a serious failure.
In addition, when the emergency generator 190 is configured to perform constant frequency control, the frequency detector 903 cannot detect a reverse power flow, and the emergency generator 190 stops due to a serious failure.
In any case, a reverse power flow is generated with respect to the emergency generator 190, and the solar power generation output is stopped after the emergency power generator 190 is stopped due to the reverse power flow, and the important load 150, the safety load 160, the disaster prevention load. 170 and the general load 180 are stopped.

  The present invention has been made in view of such circumstances, and it is possible to prevent a reverse power flow to the emergency generator during the independent operation, and to stably operate the load in the emergency microgrid system. It is an object of the present invention to provide a self-sustaining operation system and method for a distributed power source.

A self-sustained operation system of a self-sustained distributed power source according to the present invention is a self-sustained operation system of a distributed power source that reduces power supply from a commercial system (commercial power source). Compensation of power fluctuations in a power supply system (power supply line) to which power is supplied is performed by using a storage battery and power generation using natural energy, and the power generated by the power generation is supplied to the power supply system. a natural energy generator, when the commercial system is disconnected from the power supply system, the emergency generator to supply power to the power supply system, wherein the grid is disconnected and the power supply system, the emergency onset a generated power output from the electric machine and the power generation power of the natural energy power generator, by the said battery power, when supplying the power load provided in the power supply system, the innate et In the control of the operation of the Energy generator, the output power to be output to the power supply system of the emergency generator is equal to or less than the first threshold value, the supply of power from the renewable energy generators to the power supply system From the point of time when the supply of power from the natural energy generator is stopped, the stop time set in advance corresponding to the power consumption of the load is exceeded, and the output power of the emergency generator is the first When the above threshold value, characterized in that it comprises a resume control unit supplied with electric power from said relative power supply system before Symbol natural energy generator.

The self-sustained operation method of the self-sustained distributed power source of the present invention is a self-sustained operation method of the distributed power source that reduces the power supply from the commercial system, and is connected to the commercial system and supplied with power from the commercial system. Power conversion process using a storage battery to compensate for power fluctuations in the power supply system, and natural energy power generation that uses a natural energy generator to generate power using natural energy and supplies the power generated by the power generation system to the power supply system An emergency power generation process for supplying power to the power supply system from an emergency generator when the commercial system is disconnected from the power supply system, and the commercial system is disconnected from the power supply system, an output for generated power of use generators, and electric power generated by the natural energy power generation process, by the power by the power conversion process, the load provided to the power supply system When supplying power, the control of operation of the natural energy power generator, the output power to be output to the power supply system of the emergency generator is equal to or less than the first threshold value, the natural to the power supply system From the time when the supply of power through the energy generation process is stopped and the supply of power from the natural energy generator is stopped, the stop time set in advance corresponding to the power consumption of the load is exceeded, and the emergency power generation When the output power of the machine is equal to or more than the first threshold, autonomous operation method of distributed power supply, which comprises a power resumes control step the supply from the pre-Symbol natural energy power generator with respect to the power supply system .

  According to the present invention, during the self-sustaining operation using the generated power of the emergency generator and the generated power of the natural energy generator, the generated power of the natural energy generator is compared to the power consumption of the load in the emergency microgrid system. To provide a distributed power supply self-sustained operation system and method capable of preventing a reverse power flow with respect to an emergency generator even in a large case and allowing a load in an emergency microgrid system to be stably operated independently. With the goal.

1 is a schematic block diagram illustrating a configuration example of a self-sustained operation system 10 for a distributed power source according to a first embodiment of the present invention. It is a wave form diagram explaining supply control of the electric power from the solar cell 140 to the electric power feeding path | route 400 in the self-sustained operation system 10 in 1st Embodiment. It is a wave form diagram explaining supply control of the electric power from the solar cell 140 to the electric power feeding path | route 400 in the self-sustained operation system 10 by 2nd Embodiment. It is a figure which shows the structural example of 10 A of independent operation systems of the distributed power supply by 3rd Embodiment of this invention. It is a figure which shows the prior art example of the system configuration for performing uninterrupted power supply at the time of the power failure at the time of commercial interconnection operation

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a self-sustaining operation system (hereinafter, self-sustaining operation system 10) of a distributed power source according to a first embodiment of the present invention. In FIG. 1, 100 is an uninterruptible power supply device, 101 is an input unit, 102 is an output unit, 103 is a power detection unit, 110 is a control unit, 120 is an AC switch (ACSW), 130 is a storage battery, 135 is an INV (inverter, (Power conversion part) and 140 are solar cells, respectively. Also, 145 is a PCS (power conditioner), 150 is an important load, 160 is a safety load, 170 is a disaster prevention load, 180 is a general load, 181 is a voltage detection unit, power detection units 182 and 190 are emergency generators, 191 Indicates a first circuit breaker, and 192 indicates a second circuit breaker. Reference numeral 200 denotes a commercial power source, 201 denotes a power receiving point breaker, R1 denotes a power receiving point, and 400 denotes a power supply line (power supply system). In FIG. 1, the self-sustained operation system 10 is configured so that the uninterruptible power supply 100 does not instantaneously apply power to an important load 150 during a power failure during commercial interconnection operation (operation in which the commercial system and itself perform system interconnection). Turn off power supply.

  In FIG. 1, the first self-supporting range (A) including the important load 150, immediately after the power failure and after the emergency generator 190 becomes unable to generate power due to fuel depletion, during operation of the emergency generator 190 during the power failure A second self-supporting range (B), which is a range that is self-supporting, is defined. The first self-sustained range (A) includes the input unit 101 in the self-sustained operation system 10 as viewed from the commercial power supply 200 side, and includes components connected to the rear stage side of the input unit 101. The second self-supporting range (B) includes the first circuit breaker 191 and includes each component connected to the rear stage side of the first circuit breaker 191.

The autonomous operation system 10 includes an uninterruptible power supply 100, a power detection unit 103, a power conditioner 145, a solar cell 140, an important load 150, a security load 160, a disaster prevention load 170, a general load 180, a voltage detection unit 181, and a power detection unit. 182, an emergency generator 190, a first circuit breaker 191 and a second circuit breaker 192.
The general load 180 is connected to a power supply line by a commercial power source 200 that is a commercial system via a power reception point R1, and when the power supply line falls into a power failure or other abnormal state, power reception is interrupted by the power reception point breaker 201.
The safety load 160 and the disaster prevention load 170 are loads for safety use, loads for disaster prevention use, and the like, are highly important loads, and are connected to the power supply line 400. The power supply line 400 is connected to the power receiving point R1 through the first circuit breaker 191 in the same manner as the general load 180.

  An emergency generator 190 is connected to the power supply line 400 via the second circuit breaker 192 and an important load 150 is connected via the AC switch 120. The important load 150 is supplied with electric power from the emergency generator 190 when the power supply line 400 fails. The important load 150 is a server, for example, and is a load having a higher importance than the security load 160 and the disaster prevention load 170. A storage battery 130 is connected to the connection line of the important load 150 via an inverter 135 in order to enable a self-sustained operation even when the power supply line 400 is interrupted and the emergency generator 190 is stopped. The solar cell 140 is connected via the conditioner 145.

  The emergency generator 190 uses heavy oil or other fuel as a power source, and is activated when the power supply line of the commercial power supply 200 falls into a power outage or other abnormal state. The emergency generator 190 is continuously operated during the occurrence of an abnormality, and supplies power to the safety load 160, the disaster prevention load 170, and the important load 150 in place of the commercial power source 200 within the second self-supporting range (B). Further, when the power supply line of the commercial power supply 200 continues to be in an abnormal state for a long time and the emergency generator 190 continues to operate for a long time, the fuel is exhausted (run out of fuel) and the operation is stopped. Even after the emergency generator 190 runs out of fuel, as long as the power generation by the solar cell 140 is maintained and the storage battery 130 is accumulating, the critical load 150 is within the first self-supporting range (A). Power supply continues.

The power detection unit 103 is provided between the output of the emergency generator 190 and the second circuit breaker 192, for example.
When the emergency generator 190 is operating, the power detection unit 103 measures the power value of the power supplied to the power supply line 400 via the second circuit breaker 192 and measures the measured power (hereinafter, measured power value). To the control unit 110.

  The storage battery 130 is, for example, a capacitor or a secondary battery that can be repeatedly charged and discharged, and is connected to the connection line of the important load 150 via the inverter 135. The storage battery 130 is appropriately charged by the commercial power source 200, the solar battery 140, and the emergency generator 190, and operates autonomously with respect to the safety load 160, the disaster prevention load 170, and the important load 150 (within the second independent range (B)). Or the critical load 150 (when the vehicle is operating independently within the first independent range (A)).

  The inverter 135 is a bidirectional power conversion device that performs bidirectional power conversion between alternating current and direct current. The inverter 135 uses the power of the storage battery 130 to compensate for power fluctuations in the power supply line 400. The inverter 135 converts AC to DC in the operation mode when charging the storage battery 130 from the commercial power source 200, the solar battery 140, and the emergency generator 190, and in the operation mode when discharging from the storage battery 130 to the important load 150. Converts direct current to alternating current. The inverter 135 has a built-in charge / discharge control circuit for controlling charge / discharge of the secondary battery. The charge / discharge control circuit receives a storage battery command value (control command value) from the control unit 110 described later, and controls charging / discharging of the secondary battery constituting the storage battery 130 according to the storage battery command value.

  The solar cell 140 is connected to the connection line of the important load 150 via the power conditioner 145 and supplies power generation output independently to the general load 180, the safety load 160, the disaster prevention load 170, and the important load 150. . The power conditioner 145 converts the DC output of the solar cell 140 that does not conform to the predetermined frequency and voltage of the connection line of the important load 150 into predetermined AC power, and adapts the frequency and voltage to the power of the power supply line. Moreover, in this embodiment, although the solar cell 140 is used, what is necessary is just the generator (natural energy generator) using natural energy, for example, you may use the generator by wind power generation, hydroelectric power generation, etc.

The first circuit breaker 191 is turned on during a normal load operation in which the power supply line of the commercial power supply 200 to which the general load 180 is connected is in a power supply state, and is opened (cut off) when the power supply line of the commercial power supply 200 is in a power failure state. .
The second circuit breaker 192 is opened when the first circuit breaker 191 is turned on and the power supply line of the commercial power supply 200 is in a power supply state, and the power supply line of the commercial power supply 200 enters a power failure state and the voltage of the emergency generator 190 Is established (a predetermined voltage on the connection line is reached). When the second circuit breaker 192 is turned on, the power generation output of the emergency generator 190 is fed to the safety load 160, the disaster prevention load 170, and the important load 150. Further, when the emergency generator 190 stops, the second circuit breaker 192 is opened.

  The voltage detection unit 181 detects whether or not the power supply line of the commercial power supply 200 is out of power, and turns on / opens the first circuit breaker 191 and the second circuit breaker 192, and starts / stops the emergency generator 190. Take control. When the power supply line of the commercial power supply 200 fails, the voltage detection unit 181 detects the non-conduction of the power receiving point breaker 201, opens the first breaker 191 and activates the emergency generator 190 to After the voltage of the generator 190 is established, the second circuit breaker 192 is turned on. The power detection unit 181 detects the continuity of the power receiving circuit breaker 201 when the power failure of the power supply line of the commercial power supply 200 is restored, and turns on the first circuit breaker 191 and opens the second circuit breaker 192. Generator generator 190 is stopped.

  The power detection unit 182 detects total power consumption by the total load including the important load 150 (excluding the power supply from the storage battery 130, the solar battery 140, and the emergency generator 190) at the power receiving point R1. Functions as power detection means. The power detection unit 182 transmits the detected detection value (received power point power) to the control unit 110.

  The first self-supporting range (A) includes the control unit 110, the AC switch 120, the inverter 135, the storage battery 130, the solar battery 140, the power conditioner 145, and the important load 150. When the commercial power source 200 is in a healthy state (including the return state) and power supply is necessary in the first self-supporting range (A), a tidal current flows in the AC switch 120 in the forward direction. Thereby, the accumulator 130 and the important load 150 are supplied with AC power from the commercial power source 200 via the AC switch 120.

  On the other hand, when the commercial power source 200 is in a power failure state, the AC switch 120 is cut off, and the supply of AC power from the commercial power source 200 is stopped. Further, when an abnormality occurs in the commercial power source 200, the AC switch 120 is cut off as in the power failure state, and the supply of AC power from the commercial power source 200 is stopped. In this case, power from the storage battery 130 is supplied to the important load 150 via the output unit 102. Thereafter, when the emergency generator 190 starts generating power, the electric power from the emergency generator 190 is temporarily supplied to the important load 150 via the second circuit breaker 192 and the AC switch 120. Moreover, the power from the emergency generator 190 is supplied to the safety load 160 and the disaster prevention load 170 in the second self-supporting range (B). Thereafter, when the emergency generator 190 stops generating power, the AC switch 120 is cut off, and the electric power from the storage battery 130 is supplied again to the important load 150 via the output unit 102.

  Moreover, in the 1st self-supporting range (A), when the storage battery 130 is discharged or the solar battery 140 outputs and surplus power is generated, a power flow flows in the reverse direction in the AC switch 120. Thereby, even if the supply of AC power from the commercial power source 200 is stopped, power is supplied from the storage battery 130 and the solar battery 140 to the safety load 160 and the disaster prevention load 170 in the second self-supporting range (B). be able to.

  The uninterruptible power supply 100 includes an AC switch 120, a storage battery 130, an inverter 135, and a control unit 110 provided between the input unit 101 and the output unit 102. Inverter 135 is provided between AC switch 120 and storage battery 130. Although this control part 110 can also be comprised so that control by a higher-order controller etc. may be received, in this embodiment, the control part 110 shall control the uninterruptible power supply 100. FIG.

The control unit 110 is a main controller for performing each control of the autonomous operation system 10 according to the present invention. The control unit 110 is configured by a general-purpose information processing device including, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The control unit 110 outputs a command (control command value, etc.) to a predetermined block based on the input predetermined information (detection value) by executing a program stored in the ROM in advance by the CPU on the RAM. I do.
The control unit 110 outputs a control signal and a control command value to the charge / discharge control circuit of the AC switch 120, the power conditioner 145, and the inverter 135, and controls them.

  The control unit 110 includes an internal storage unit 110a. In this internal storage unit 110a, a threshold value for determining whether or not the generated power of the two solar cells 140 of the stop threshold power P1 and the start threshold power P2 larger than the stop threshold power P1 is supplied to the power supply line 400. The power is written and stored in advance.

  The stop threshold power P1 is a power value obtained by adding a margin α to the lower limit value Pmin of the emergency generator output power Pm output from the emergency generator 190, which generates a reverse power flow with respect to the emergency generator 190. Set to (Pmin + α). For example, the control unit 110 compares the emergency generator output power Pm with the stop threshold power P1, and the emergency generator output power Pm becomes equal to or less than the stop threshold power P1. This is a power value at which the emergency generator output power Pm decreases during the stop time required until the power conditioner 145 stops supplying power to the power supply line 400 by outputting the PCS stop command. For the power value that decreases during this stop time, an experiment is performed in advance with an actual machine to obtain the maximum value of values that decrease during the stop time in a plurality of situations, and this power value or a power value that is slightly larger than the maximum value (for example, the maximum value) Use 105% of the value).

  On the other hand, the start threshold power P2 is obtained by adding the power value obtained by adding the effective maximum power of the solar cell 140 to the stop threshold power P1 or a slightly larger power value (for example, 105% of the effective maximum power value of the solar cell 140). Power value). Thereby, when the emergency generator output power Pm exceeds the start threshold power P2 and power is supplied from the solar cell 140 to the power supply line 400, the power value supplied from the solar cell 140 to the power supply line 400 is effective maximum. Even if it is electric power, the emergency generator output power Pm does not fall below the stop threshold power P1. Thereby, the control unit 110 instructs the power conditioner 145 to stop the supply of the generated power of the solar cell 140 to the power supply line 400 and the supply of the generated power of the solar cell 140 to the power supply line 400. Each of the PCS activation commands to be started is not frequently output, and chattering operation can be prevented.

Next, FIG. 2 is a waveform diagram for explaining the start and stop control of power supply from the solar cell 140 to the power supply line 400 of the self-sustained operation system 10 in the first embodiment. In FIG. 2, the vertical axis represents emergency generator output power (unit: kW), and the horizontal axis represents time (t).
With reference to FIG. 2, control for starting and stopping power supply from the solar cell 140 to the power supply line 400 in the self-sustaining operation system 10 illustrated in FIG. 1 will be described. Here, the power supply line of the commercial power supply 200 is cut off, and the power output from the emergency generator 190, the power generated by the discharge of the storage battery 130, and the power generated by the solar battery 140 are within the first self-supporting range (A). This is a state where the self-sustaining operation is performed. Further, the description will be made from the state where the power conditioner 145 supplies the generated power of the solar cell 140 to the power supply line 400. Further, the following description will be made on the assumption that the effective maximum power of the solar cell 140 is larger than the power supplied to the important load 150. Further, the control unit 110 periodically compares each of the stop threshold power P1 and the start threshold power P2 with the emergency generator output power Pm.

Time t1:
The control unit 110 reads out each of the stop threshold power 2 as the stop threshold power P1 and the start threshold power Pm from the internal storage unit 110a. Then, the control unit 110 compares each of the read stop threshold power P1 and start threshold power P2 with the emergency generator output power Pm output from the emergency generator 103 supplied from the power detection unit 103. .
Here, the control unit 110 detects that the emergency generator power Pm exceeds the stop threshold power P1 and the power conditioner 145 is in an activated state, so that a control command is issued to the power conditioner 145. Do not output.
Thereby, the power conditioner 145 supplies the generated power of the solar cell 140 to the power supply line.
As a result, power is supplied to the power supply line 400 from each of the emergency generator 190, the storage battery 130, and the solar battery 140 (the power conditioner 145 is in the operating state from time t1 to time t3).

Time t2:
The control unit 110 compares each of the read stop threshold power P1 and the start threshold power P2 with the emergency generator output power Pm output from the emergency generator 103 supplied from the power detection unit 103.
The controller 110 detects that the emergency generator power Pm is less than the start threshold power P2 and exceeds the stop threshold power P1.
In addition, the control unit 110 does not output a control command to the power conditioner 145 because the stop threshold power P1 is exceeded and the power conditioner 145 is in the activated state.

Time t3:
The control unit 110 compares each of the stop threshold power P1 and the start threshold power P2 with the emergency generator output power Pm supplied from the power detection unit 103.
Here, the control unit 110 detects that the emergency generator output power Pm is equal to or less than the stop threshold power P1.
Then, since the power conditioner 145 is in the activated state, the control unit 110 determines that a reverse power flow is generated from the power supply line 400 with respect to the emergency generator 190, and is a control command for stopping the power conditioner 145. The command is output to the power conditioner 145.

By supplying this stop command, the power conditioner 145 stops the operation of supplying the power generated by the solar cell 140 to the power supply line 400. As a result, the power generated by the solar cell 140 is not supplied to the power supply line 400, and reverse power flow from the power supply line 400 to the emergency generator 190 is prevented.
As a result, the power including the important load 150 connected to the power supply line 400 is supplied from the emergency generator 190 and the storage battery 130 (the power conditioner 145 is stopped from the time t3 to the time t5). State).

Time t4:
The control unit 110 compares each of the stop threshold power P1 and the start threshold power P2 with the emergency generator output power Pm supplied from the power detection unit 103.
Here, the control unit 110 detects that the emergency generator output power Pm exceeds the stop threshold power P1 and is less than the start threshold power P2.
Further, since the emergency generator output power Pm is less than the start threshold power P2, the control unit 110 does not output any control command of the stop command and the start command to the power conditioner 145.

Time t5:
The control unit 110 compares each of the stop threshold power P1 and the start threshold power P2 with the emergency generator output power Pm supplied from the power detection unit 103.
Here, the control unit 110 detects that the emergency generator output power Pm exceeds the stop threshold power P1 and is equal to or higher than the start threshold power P2.
Then, since the power conditioner 145 is in a stopped state, the control unit 110 outputs a start command, which is a control command for starting the power conditioner 145, to the power conditioner 145.

When this activation command is supplied, the power conditioner 145 starts (that is, restarts) the supply of the generated power of the solar cell 140 to the power supply line 400.
As a result, power is supplied from the emergency generator 190, the storage battery 130, and the solar battery 140 to loads including the important load 150 connected to the power supply line 400.

Time t6:
The control unit 110 compares each of the read stop threshold power P1 and the start threshold power P2 with the emergency generator output power Pm output from the emergency generator 103 supplied from the power detection unit 103.
The controller 110 detects that the emergency generator power Pm is less than the start threshold power P2 and exceeds the stop threshold power P1.
In addition, the control unit 110 does not output a control command to the power conditioner 145 because the stop threshold power P1 is exceeded and the power conditioner 145 is in the activated state.

As described above, in the present embodiment, in the power supply process from the solar cell 140 to the power supply line 400, two threshold values having different power values of the stop threshold power P1 and the start threshold power P2 are used to supply the power line 400. The supply of electric power from the solar cell 140 is controlled for each state transition of stop and start of the power conditioner 145.
Thus, according to the present embodiment, the emergency generator output power Pm for stopping the power conditioner 145 is determined based on the stop threshold power P1, and the emergency generator output power Pm for starting the power conditioner 145 is stopped. Since the determination is made based on the starting threshold power P2 that is larger than the threshold power P1, chattering for starting and stopping the power conditioner 145 at short intervals is eliminated, so that the deterioration of the power conditioner 145 and the like is suppressed, and the It becomes possible to prevent reverse power flow with respect to the generator 190.

<Second Embodiment>
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. The self-sustained operation system (hereinafter, self-sustained operation system 10) of the distributed power source in the second embodiment has the same configuration as that of the first embodiment shown in FIG.
Hereinafter, differences of the second embodiment from the first embodiment will be described.
The self-sustained operation system 10 of the distributed power source according to the second embodiment is different from the first embodiment in that when the control unit 110 starts the power conditioner 145 from the stop, the elapsed time after the stop is used. It is. That is, in the first embodiment, the control unit 110 stops the power conditioner 145 when the emergency generator output power Pm becomes equal to or lower than the stop threshold power P1, and the emergency generator output power Pm is activated. The power conditioner 145 was activated when the threshold power P2 was exceeded.

  On the other hand, in the second embodiment, the control unit 110 stops the power conditioner 145 when the emergency generator output power Pm becomes equal to or less than the stop threshold power P1, and after the stop, the controller 110 stops for a predetermined time (stop). When the time (Ts) has elapsed, the inverter 145 is activated. Therefore, the stop threshold power P1 and the time Ts are written and stored in advance in the internal storage unit 110a of the control unit 110. This time Ts is set as a predetermined time. For example, the time Ts is set corresponding to the amount of power consumed by a load (an important load 150, a safety load 160, a disaster prevention load 170, etc.) connected to the power supply line 400. Yes. That is, when the amount of power generated by the solar cell is reduced, the load is affected as the power consumption increases, so the time Ts is shortened as the power consumption is large, while the time Ts is shortened as the power consumption is small. Lengthen.

  In addition, the control unit 110 has a counter (counter) inside, and the counter is used for the time from when the power conditioner 145 is stopped (after the stop instruction of the power conditioner 145 is output). Count (count). Then, the control unit 110 compares the counted value (count) with the time Ts, and stops the operation of the power conditioner 145 when the count value becomes equal to or greater than the time Ts.

Next, FIG. 3 is a waveform diagram illustrating start and stop control of power supply from the solar cell 140 to the power supply line 400 of the self-sustained operation system 10 in the second embodiment. In FIG. 3, the vertical axis represents emergency generator output power (unit: kW), and the horizontal axis represents time (t).
With reference to FIG. 3, start and stop control of power supply from the solar cell 140 to the power supply line 400 in the self-sustained operation system 10 illustrated in FIG. 1 will be described. Here, the power supply line of the commercial power supply 200 is cut off, and the power output from the emergency generator 190, the power generated by the discharge of the storage battery 130, and the power generated by the solar battery 140 are within the first self-supporting range (A). This is a state where the self-sustaining operation is performed. Further, the description will be made from the state where the power conditioner 145 supplies the generated power of the solar cell 140 to the power supply line 400. Further, the following description will be made on the assumption that the effective maximum power of the solar cell 140 is larger than the power supplied to the important load 150. Further, the control unit 110 periodically compares the stop threshold power P1 and the emergency generator output power Pm, and after the power conditioner 145 is stopped, the elapsed time after the power conditioner 145 is stopped Comparison with time Ts is performed.

Time t11:
The control unit 110 reads each of the stop threshold power P1 and the time Ts from the internal storage unit 110a. Then, the control unit 110 compares the read stop threshold power P1 with the emergency generator output power Pm output from the emergency generator 103 supplied from the power detection unit 103.
At this time, the control unit 110 detects that the emergency generator output power Pm is equal to or less than the stop threshold power P1.
Then, since the power conditioner 145 is in the activated state, the control unit 110 outputs a stop command, which is a control command for stopping the power conditioner 145, to the power conditioner 145.

By supplying this stop command, the power conditioner 145 stops the operation of supplying the power generated by the solar cell 140 to the power supply line 400.
As a result, the power including the important load 150 connected to the power supply line 400 is supplied from the emergency generator 190 and the storage battery 130 (the power conditioner 145 is stopped from the time t11 to the time t13). State). As a result, the power generated by the solar cell 140 is not supplied to the power supply line 400, and reverse power flow from the power supply line 400 to the emergency generator 190 is prevented.
In addition, when outputting a stop command, which is a control command, to the power conditioner 145, the control unit 110 resets the internal timer (sets it to “0”), and then starts counting by this timer.

Time t12:
Since the time counted by the timer is less than the time Ts, that is, the time Ts has not elapsed since the control unit 110 stopped supplying power from the solar cell 140 to the power supply line 400, the power conditioner 145 Does not output the start command for.

Time t13:
The control unit 110 activates the power conditioner 145 when the count value of the internal counter exceeds the time Ts of the internal storage unit 110a and the output power of the emergency generator 190 is equal to or greater than the stop threshold power P1. .
Thereby, the power conditioner 145 supplies the power generated by the solar cell 140 to the power supply line 400.
As a result, power is supplied from the emergency generator 190, the storage battery 130, and the solar battery 140 to loads including the important load 150 connected to the power supply line 400 (from time t13, the power conditioner 145 is activated).

  As described above, in the present embodiment, in the process of supplying the generated power of the solar cell 140 to the power supply line 400, when the emergency generator output power Pm is equal to or less than the stop threshold power P1, the solar cell 140 The supply of power to the power supply line 400 is stopped. Then, when the time Ts has elapsed since the supply of power from the solar cell 140 to the power supply line 400 is stopped and the output power of the emergency generator 190 is equal to or greater than the stop threshold power P1, the solar cell 140 supplies the power supply line 400. Control to start power supply is performed.

  Thus, according to the present embodiment, when the emergency generator output power Pm for stopping the power conditioner 145 is determined based on the stop threshold power P1 and the power conditioner 145 is started, the predetermined time Ts is given after the stop. And when the output power of the emergency generator 190 is equal to or greater than the stop threshold power P1, it is possible to secure a certain period of time from when the power conditioner 145 stops until it starts. . As a result, chattering processing for starting and stopping the power conditioner 145 at short intervals is eliminated, so that reverse power flow to the emergency generator 190 can be prevented while suppressing deterioration of the power conditioner 145 and the like. .

<Third Embodiment>
The third embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a diagram showing a configuration example of a self-sustained operation system (hereinafter, self-sustained operation system 10A) of a distributed power source according to the third embodiment of the present invention. 4 is different from the first and second embodiments in FIG. 1 in that a switch 142 is interposed between the power supply line 400 and the power conditioner 145. It is that you are. Moreover, the same code | symbol is attached | subjected about the structure similar to FIG. 1, and the description is abbreviate | omitted.

In the self-sustained operation system 10 of the first embodiment and the second embodiment, when the supply of power from the emergency generator 190 to the power supply line 400 is stopped, the power conditioner 145 is stopped and the solar cell 140 is started. The generated power is not output to the power supply line 400.
In the third embodiment, the output of the power conditioner 145 is turned on and off without controlling the power supply from the solar cell 140 to the power supply line by stopping and starting the power conditioner 145, and by turning the switch 142 on and off. Whether or not the generated power of the solar cell 140 to be supplied is supplied to the power supply line 400 is controlled.

Next, similarly to the first embodiment, a case where the stop and start control of power supply from the solar cell 140 to the power supply line 400 using the stop threshold power P1 and the start threshold power P2 will be described below. .
The power supply line of the commercial power supply 200 is cut off, and the power supply from the emergency generator 190, the storage battery 130, and the solar battery 140 to the power supply line 400 is performed, so that the self-sustained operation is performed in the first self-supporting range (A). At this time, the control unit 110A performs power supply control from the solar cell 140 to the power supply line 400 as follows.

  When the emergency generator output power Pm supplied from the power detection unit 103 becomes equal to or less than the stop threshold power P1, the control unit 110A assumes that a reverse power flow is generated from the power supply line 400 to the emergency generator 190. The switch 142 is turned off, the power conditioner 145 is disconnected from the power supply line 400 (that is, the operation of the solar cell 140 is stopped), and the supply of power from the solar cell 140 to the power supply line 400 is stopped. As a result, the power generated by the solar cell 140 is not supplied to the power supply line 400, and reverse power flow from the power supply line 400 to the emergency generator 190 is prevented. Then, electric power is supplied to loads only from the electric power from the emergency generator 190 and the storage battery 130 (the security load 160, the disaster prevention load 170, and the important load 150 connected to the power supply line 400).

  On the other hand, when the emergency generator output power Pm supplied from the power detection unit 103 becomes equal to or greater than the start-up threshold power PV2, the control unit 110A generates a reverse power flow from the power supply line 400 to the service generator 190. Switch 142 is turned on. Thereby, the power conditioner 145 and the power supply line 400 are connected, and the supply of power from the solar cell 140 to the power supply line 400 is started. As a result, power is supplied from the solar cell 140 to the power supply line 400, and the power from the emergency generator 190, the storage battery 130, and the solar cell 140 is loaded (the safety load 160 connected to the power supply line 400, disaster prevention). Load 170 and important load 150).

Next, similarly to the second embodiment, a case where the supply of power from the solar cell 140 to the power supply line 400 is controlled using the stop threshold power P1 and the time Ts will be described below.
When the emergency generator output power Pm becomes equal to or less than the stop threshold power P1, the control unit 110A turns off the switch 142 and stops the power conditioner 145 to stop the supply of power from the solar cell 140 to the power supply line 400. And the power supply line 400 are disconnected.
Further, the control unit 110A determines that a predetermined time Ts has elapsed after the switch 142 is turned off and the supply of power from the solar cell 140 to the power supply line 400 is stopped, and the output power of the emergency generator 190 is set to the stop threshold value. When the electric power becomes equal to or higher than P1, the supply of electric power from the solar cell 140 to the power supply line 400 is started.

  Therefore, the control unit 110 </ b> A turns on the switch 142 and connects the power conditioner 145 and the power supply line 400. That is, the control unit 110 </ b> A has a counter (counter) inside, and counts (counts) the time after the stop command is output to the power conditioner 145 by this counter. Then, the control unit 110A compares the counted value (count) with the time Ts, and when the count value exceeds the time Ts and the output power of the emergency generator 190 is equal to or higher than the stop threshold power P1, The operation of the inverter 145 is started.

  Further, a program for realizing the functions of the control unit 110 in FIG. 1 and the control unit 110A in FIG. 4 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read by a computer system. Execution control of power supply from the solar cell 140 to the power supply line 400 may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within a scope not departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10,10A ... Self-supporting operation system 100 ... Uninterruptible power supply device 101 ... Input part 102 ... Output part 103 ... Electric power detection part 110, 110A ... Control part 110a ... Internal storage part 120 ... AC switch (ACSW)
130 ... Storage battery 140 ... Solar cell 142 ... Switch 145 ... Power conditioner (PCS)
DESCRIPTION OF SYMBOLS 150 ... Important load 160 ... Safety load 170 ... Disaster prevention load 180 ... General load 181 ... Voltage detection part 182 ... Electric power detection part 190 ... Emergency generator 191 ... First circuit breaker 192 ... Second circuit breaker 200 ... Commercial power supply 201 ... Receiving point circuit breaker 400 ... Power supply line R1 ... Receiving point

Claims (2)

  1. This is a self-sustaining operation system for distributed power sources that reduces power supply from commercial systems.
    A power conversion unit that performs power grid compensation with a power storage system connected to the commercial system using a storage battery.
    A natural energy generator that generates power using natural energy and supplies power generated by the power generation to the power supply system;
    When the commercial system is disconnected from the power supply system, an emergency generator that supplies power to the power supply system;
    The commercial system is disconnected from the power supply system, and the generated power output from the emergency generator, the generated power from the natural energy generator, and the power of the storage battery are used to power the load provided in the power supply system. In the control of the operation of the natural energy generator, when the output power output to the power supply system of the emergency generator is equal to or lower than a first threshold , the natural energy is supplied to the power supply system. When the supply of power from the generator is stopped and the supply of power from the natural energy generator is stopped, the stop time set in advance corresponding to the power consumption of the load is exceeded, and the emergency power generation When the output power of the machine is equal to or more than the first threshold value, min, characterized in that it comprises a resume control unit supplied with power from the previous SL natural energy power generator with respect to the power supply system Self-sustaining operation system of the type of power supply.
  2. This is a self-sustaining operation method for distributed power sources that reduces power supply from commercial systems.
    Power conversion process using a storage battery to compensate for power fluctuations in a power supply system that is connected to the commercial system and supplied with power from the commercial system;
    A natural energy power generation process using a natural energy generator to generate power using natural energy, and supplying the power generated by the power generation to the power supply system;
    When the commercial system is disconnected from the power supply system, an emergency power generation process for supplying power from the emergency generator to the power supply system;
    The commercial system is disconnected from the power supply system, and the load provided in the power supply system by the generated power output from the emergency generator, the generated power by the natural energy power generation process, and the power by the power conversion process when supplying two power, the control of operation of the natural energy power generator, the output power to be output to the power supply system of the emergency generator is equal to or less than the first threshold value, to the power supply system When the supply of electric power through the natural energy power generation process is stopped and the supply of electric power from the natural energy generator is stopped, a stop time set in advance corresponding to the power consumption of the load is exceeded, and an emergency this output power of the use generator comprises becomes a first threshold or more, and a power resumes control step the supply from the pre-Symbol natural energy power generator with respect to the power supply system A self-sustaining operation method of a distributed power source characterized by
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US4668265A (en) 1985-06-18 1987-05-26 Owens-Corning Fiberglas Corporation Corrosion resistant cobalt-base alloy and method of making fibers
US4668266A (en) 1985-06-18 1987-05-26 Owens-Corning Fiberglas Corporation Corrosion resistant cobalt-base alloy having a high chromium content and method of making fibers
US4765817A (en) 1985-06-18 1988-08-23 Owens-Corning Fiberglas Corporation Corrosion resistant cobalt-base alloy containing hafnium
US4767432A (en) 1985-06-18 1988-08-30 Owens-Corning Fiberglas Corporation Corrosion resistant cobalt-base alloy containing hafnium and a high proportion of chromium
US4820324A (en) 1987-05-18 1989-04-11 Owens-Corning Fiberglas Corporation Glass corrosion resistant cobalt-based alloy having high strength
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DE112016006748T5 (en) 2016-04-14 2018-12-27 Mitsubishi Electric Corporation ENERGY MANAGEMENT SYSTEM
CN107317348A (en) * 2016-12-16 2017-11-03 深圳微网能源管理系统实验室有限公司 A kind of composite energy storage control method for taking into account energy and power
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JPH05207658A (en) * 1992-01-28 1993-08-13 Ishikawajima Harima Heavy Ind Co Ltd Power supply method in co-generation facility
JP4241456B2 (en) * 2004-03-23 2009-03-18 大阪瓦斯株式会社 Power generation system
JP5626563B2 (en) * 2010-05-31 2014-11-19 清水建設株式会社 Power system

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US4668265A (en) 1985-06-18 1987-05-26 Owens-Corning Fiberglas Corporation Corrosion resistant cobalt-base alloy and method of making fibers
US4668266A (en) 1985-06-18 1987-05-26 Owens-Corning Fiberglas Corporation Corrosion resistant cobalt-base alloy having a high chromium content and method of making fibers
US4765817A (en) 1985-06-18 1988-08-23 Owens-Corning Fiberglas Corporation Corrosion resistant cobalt-base alloy containing hafnium
US4767432A (en) 1985-06-18 1988-08-30 Owens-Corning Fiberglas Corporation Corrosion resistant cobalt-base alloy containing hafnium and a high proportion of chromium
US4820324A (en) 1987-05-18 1989-04-11 Owens-Corning Fiberglas Corporation Glass corrosion resistant cobalt-based alloy having high strength
KR20180029311A (en) * 2016-09-12 2018-03-21 이콘시스 주식회사 Network security system and network security method using the same
KR101955258B1 (en) * 2016-09-12 2019-03-08 이콘시스 주식회사 Network security system and network security method using the same

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