WO2019208728A1 - System that interlinks with hydroelectric power generation line - Google Patents

System that interlinks with hydroelectric power generation line Download PDF

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Publication number
WO2019208728A1
WO2019208728A1 PCT/JP2019/017778 JP2019017778W WO2019208728A1 WO 2019208728 A1 WO2019208728 A1 WO 2019208728A1 JP 2019017778 W JP2019017778 W JP 2019017778W WO 2019208728 A1 WO2019208728 A1 WO 2019208728A1
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WO
WIPO (PCT)
Prior art keywords
power
generator
current
rectifier
detection means
Prior art date
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PCT/JP2019/017778
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French (fr)
Japanese (ja)
Inventor
水谷　政敏
伊藤　隆志
寛太 木村
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Ntn株式会社
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Filing date
Publication date
Priority claimed from JP2018086833A external-priority patent/JP7191543B2/en
Priority claimed from JP2018086834A external-priority patent/JP7191544B2/en
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Priority to KR1020207031328A priority Critical patent/KR102726845B1/en
Priority to CN201980028037.6A priority patent/CN112020808B/en
Publication of WO2019208728A1 publication Critical patent/WO2019208728A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin

Definitions

  • the present invention relates to a hydroelectric power generation system interconnection system in which a hydroelectric power generation apparatus such as a small hydropower generation apparatus is linked to an AC commercial power system.
  • Hydropower generator is a system that uses the kinetic energy of running water for power generation.
  • the main configuration includes a water wheel that rotates in response to a flow of water, a generator that is connected to the water wheel to convert rotational energy into electric energy, a power generator output, and a control device that controls the water wheel. Since the optimum power to be extracted from the generator varies depending on the flow velocity, the control device measures the flow velocity, the rotation speed of the turbine or the generated voltage of the generator, determines the optimum power to be extracted from the generator, and determines the generator power. Control so that the quantity and the optimum value match.
  • a grid-connected system that sells power generated by hydroelectric power linked to an AC commercial power grid (hereinafter sometimes simply referred to as “grid”) has a maximum efficiency torque so that the output of the generator is maximized.
  • grid has a maximum efficiency torque so that the output of the generator is maximized.
  • generator control means generator control driver
  • output voltage control means system-connected inverter
  • the power conversion circuit 52 that converts the output of the three-phase alternating current of the generator 51 of the hydroelectric generator into direct current
  • the generator control means 53 that is the control means
  • a grid interconnection system is constituted by a grid interconnection inverter composed of an inverter 55 that converts AC power and its output voltage control means 56 (for example, Patent Document 1).
  • the configuration of a conventional grid-connected hydroelectric power generation system includes a synchronous generator, a generator control means (generator control driver) dedicated to the synchronous generator, and an output voltage control means (system-connected inverter). Because it is a specially designed device tailored to the equipment, the equipment is expensive. Therefore, in the power generation device for small power generation installed in irrigation channels such as agricultural water and industrial water, so-called small hydroelectric power generation device, the ratio of the cost occupied by electrical equipment for grid connection in the entire system increases. It is uneconomical.
  • the present invention solves the above problems, and an object of the present invention is to provide a hydroelectric power grid interconnection system in which a general-purpose product can be used as a means for grid interconnection, and the cost can be reduced while ensuring quality. That is.
  • the hydropower system interconnection system of the present invention includes a water turbine 1, a generator 3 that converts rotational energy of the water turbine 1 into electric energy, a rectifier 15 that converts the generated power of the generator 3 into DC power, and the rectifier 15 includes a power conditioner 8 that converts the DC power rectified in 15 into AC power that can be connected to the grid 9, and a control device 4 that controls the rotational speed of the water turbine 1 by adjusting the load of the generator 3.
  • the power conditioner 8 is an integral general-purpose product.
  • the control for changing the rotation speed of the water turbine 1 by adjusting the load of the generator 3 is performed by controlling the maximum power point control (MPPT control) of the control device 4 and the power conditioner 8 provided separately from the power conditioner 8. ) And the like, and the generated power converted into direct current is supplied to the power conditioner 8 by performing the AC / DC conversion control in the control device 4, so that the general-purpose power conditioner 8 can be used. .
  • MPPT control maximum power point control
  • the generated power converted into direct current is supplied to the power conditioner 8 by performing the AC / DC conversion control in the control device 4, so that the general-purpose power conditioner 8 can be used.
  • the integrated general-purpose power conditioner 8 is used as it is for the equipment that connects the generated power to the grid 9, it is cheaper than the case of using a specially designed equipment while ensuring quality. It is possible to provide a power generation system.
  • the “general-purpose product” referred to in this specification is not designed exclusively for a specific type of power generator, but is a range of power and voltage that can be processed by input, and the voltage of the grid 9 connected to the system. And if the frequency is matched, it means that the device is applicable.
  • An “integrated general-purpose product” refers to a general-purpose product in which all components are incorporated in a common housing and can be handled as a single object.
  • the power conditioner 8 may be a general-purpose product for connection to the solar power generation system 9. That is, the power conditioner 8 which connects the solar cell panel with which the photovoltaic cell was combined with the system
  • strain 9 may be sufficient.
  • Photovoltaic power generation is spreading, and many power conditioners 8 for grid interconnection are commercially available at low cost and high quality due to mass production effects. By using such a commercially available power conditioner 8, it is possible to construct an even more inexpensive and high-quality hydropower system interconnection system.
  • the rectifier 15 may include a rectification function unit 15a that performs rectification and a switch function unit 14 that turns on and off the input of the power generated by the generator 3 to the rectification function unit 15a. If the rectifier 15 for rectifying the generated power has a switch function for turning it on and off, the generator 3 and the system 9 can be disconnected, and it is possible to cope with overvoltage power caused by high-speed rotation of the turbine 1 or power failure of the system 9. Becomes easy.
  • a consumption resistance device that is connected between the generator 3 and the power conditioner 8 and absorbs overvoltage power by resistance, and when the generated power of the generator 3 becomes an overvoltage higher than a set voltage, Consumption resistance control means for causing the consumption resistance device to absorb overvoltage power generated in the generated power may be provided.
  • the consumption resistance device and the consumption resistance control means are provided in this way, it is possible to absorb the overvoltage power generated by the high speed rotation of the water turbine 1 or the power failure of the system 9, and this hydraulic power system interconnection system is configured. Degradation and damage due to overvoltage of the equipment can be prevented.
  • the control device may not have means for consuming the generated power by resistance when the rectifying function unit is off.
  • the rectifier 15 has a switch function unit 14 for turning on and off the input of the power generated by the generator 3 to the rectification function unit 15a, the control device 4 and the power condition are protected against overvoltage power caused by high-speed rotation of the water turbine 1. Na 8 can be protected. Since the control device 4 does not have means for consuming generated power by resistance when the rectifying function unit 15a is off, an increase in cost due to consumption resistance means can be suppressed.
  • the high speed rotation of the water turbine 1 can be dealt with by providing a brake means or the like.
  • Voltage detection means 18 for measuring the voltage rectified by the rectifier 15 of the generator 3;
  • Current detection means 17 for measuring the current rectified by the rectifier 15 of the generator 3;
  • Current calculating means for calculating the current detected by the current detecting means 17;
  • Rotational speed detection means 19 for detecting the rotational speed of the generator 3 from the frequency of the generated power of the generator 3; It is determined from the voltage, current, and rotation speed detected by the voltage detection means 18, the current detection means 17, and the rotation speed detection means 19, and the start, stop, and abnormal signals output from the power conditioner 8.
  • Fail safe control means 23 for performing either one or both of shutting off the input to the rectifier 15 of the generator 3 and braking of the braking means 10 provided in the generator 3 when the protection operating condition is satisfied. You may have.
  • voltage detection means 18 for measuring the voltage rectified by the rectifier 15 of the generator 3;
  • Current detection means 17 for measuring the current rectified by the rectifier 15 of the generator 3;
  • Current calculating means for calculating the current detected by the current detecting means 17;
  • Rotational speed detection means 19 for detecting the rotational speed of the generator 3 from the frequency of the generated power of the generator 3; It is determined from the voltage, current, and rotation speed detected by the voltage detection means 18, the current detection means 17, and the rotation speed detection means 19, and the start, stop, and abnormal signals output from the power conditioner 8.
  • the protection operation condition is satisfied, either or both of the command to turn off the switch function unit 14 of the rectifier 15 of the generator 3 and the braking of the braking means 10 provided in the generator 3 are performed. You may have the fail safe control means 23 to perform.
  • the hydroelectric generator shown in FIG. 1 is an example of a hydroelectric generator in which the hydraulic turbine 1 is a horizontal axis type (propeller type).
  • the water wheel 1 is a relatively small water wheel installed in a waterway such as agricultural water, industrial water, or water and sewage.
  • the water wheel 1 is rotated by the kinetic energy of water, and the main shaft 1 a of the water wheel 1 rotates the generator 3.
  • a hydroelectric generator 2 is constituted by the turbine 1 and the generator 3.
  • the hydroelectric generator 2 is provided with braking means such as an electromagnetic brake 10 that brakes the water turbine 1 or the generator 3.
  • the generator 3 is connected to the system 9 via the control device 4 and the power conditioner 8.
  • the system 9 is an AC commercial power system, for example, 100V or 200V, 50 or 60 Hz low voltage wiring.
  • the hydro turbine 1, the generator 3, the control device 4, and the power conditioner 8 constitute a hydroelectric power system interconnection system.
  • the generator 3 is a three-phase synchronous generator using a permanent magnet, and is fastened to the main shaft 1a by a coupling (not shown) or the like.
  • a speed increaser (not shown) is provided between the main shaft 1a and the generator 3 as necessary.
  • torque is applied to the turbine 1 from the generator 3, and the rotation of the turbine 1 is braked.
  • the load is increased, the rotation speed of the water turbine 1 is decreased.
  • the rotation speed of the water turbine 1 is increased.
  • a control device 4, a power conditioner 8, and a system 9 are connected as a load of the generator 3.
  • the control device 4 and the power conditioner 8 increase or decrease the torque of the generator 3 according to the flow velocity of the water channel so as to control the water turbine 1 to rotate at an optimum rotation speed.
  • the flow velocity of the water channel is detected by an anemometer 25.
  • the torque of the generator 3 may be increased or decreased according to the rotation speed of the water turbine 1 or the rotation speed of the generator 3.
  • the rotational speed of the generator 3 may be detected from the frequency of the generated power.
  • the rotational speed of the water turbine 1 and the rotational speed of the generator 3 are in a fixed relationship, and if one of them can be detected, the other can be found by calculation.
  • the control device 4 includes a main circuit unit 6, a control circuit unit 5 that controls the main circuit unit 6, and a consumption resistance device 7.
  • the main circuit unit 6 is provided with a rectifier 15 that converts the three-phase AC power of the generator 3 into a direct current and a DC / DC converter 16 that boosts the rectified direct current.
  • the DC / DC converter 16 uses, for example, a voltage that can control the voltage on the secondary side that is the boost side by a control input.
  • the power conditioner 8 is a device connected in parallel with the system 9 and converts the input DC power into AC power having a voltage (slightly higher voltage), frequency, and phase equivalent to the system 9.
  • an integral general-purpose product is used. That is, a general-purpose product that can be handled as an integrated device in which components (not shown) are housed in a housing is used.
  • a power conditioner that is mass-produced for photovoltaic power generation that converts the generated power of the photovoltaic power generation into AC power that can be connected to the grid 9 is used.
  • FIG. 3 shows an example of a power conditioner 8 for photovoltaic power generation used in this embodiment.
  • the power conditioner 8 includes a DC / DC converter 31, a DC / AC inverter 32, and a control means 33.
  • the DC / DC converter 31 is a means for boosting the input DC power to a voltage corresponding to the voltage of the system 9, and the output voltage is variable.
  • the input voltage of the DC / DC converter 31 is the output voltage of the solar cell module 36 which is the original use of the power conditioner 8, and is the voltage output for grid connection in general solar power generation.
  • One of the voltages (for example, single phase 100 / 200V or three phase 200V) is used.
  • the DC / AC inverter 32 converts the DC power output from the DC / DC converter 31 into AC power having a frequency and phase that can be linked to the system 9.
  • the control means 33 includes a power control unit 34 and a maximum power point control unit 35.
  • the power control unit 34 performs basic control on the DC / DC converter 31 and the DC / AC inverter 32.
  • the maximum power point control unit 35 gives a command to the power control unit 34 so as to perform maximum power point tracking control (MPPT control) by the hill-climbing method.
  • MPPT control maximum power point tracking control
  • the MPPT control will be described.
  • the amount of power generated by a power generation device such as the solar cell module 36 is determined by the product of the voltage and current, but the generated voltage and current vary.
  • the MPPT control by the maximum power point tracking control unit 35 always searches for an operating point that is a combination of voltage and current so that the maximum output is generated.
  • the power control unit 34 controls the DC / DC converter 31 and the DC / AC inverter 32 so as to work at the operating point obtained by the maximum power point control unit 35 as described above.
  • the control unit 33 may be configured to control the DC / DC converter 31 and the DC / AC inverter 32 by, for example, a pulse width modulation method without providing the maximum power point control unit 35.
  • FIG. 2 shows a specific configuration example of the control device 4 provided between the generator 3 and the power conditioner 8.
  • the main circuit unit 6 includes an AC / DC control power source 13, an ammeter 17 as current detection means, a rotation speed detection means 19, and a voltmeter 18 as voltage detection means.
  • the rectifier 15 is means for converting the three-phase AC generated power of the generator 3 into direct current, and has a rectifier function unit 15a for performing this conversion and a switch function unit 14.
  • the rectifier function unit 15a is composed of a half-bridge circuit in which two semiconductor switching elements (not shown) positioned on the positive potential side and the negative potential side of the output are provided for each phase.
  • the switch function unit 14 includes switching elements (not shown) for each phase that open and close a circuit that is input from the generator 3 to the rectifier function unit 15a.
  • Each switching element of the switch function unit 14 is an element that can be opened and closed by a control input.
  • the AC / DC control power supply 13 is a power supply for operating the control device 4, converts a part of the AC power generated by the generator 3 into DC power, and supplies the DC power to the control circuit unit 5 and the consumption resistance device 7.
  • another power supply such as a battery may be used.
  • the ammeter 17 detects the current value of the current boosted by the DC / DC converter 16.
  • the voltmeter 18 detects the voltage value of the boosted current. That is, the ammeter 17 and the voltmeter 18 detect the current and voltage input to the power conditioner 8.
  • the rotation speed detection means 19 detects the rotation speed of the generator 3 from the frequency of the generated current. This detection is performed on the power before rectification of the rectifier 15.
  • the consumption resistance device 7 is means for consuming electric power generated by the generator 3 for rotation control of the windmill 1, circuit protection, and the like.
  • the consumption resistance device 7 includes a consumption resistance 7a for short-circuiting the positive potential side wiring and the negative potential side between the DC / DC converter 16 and the power conditioner 8, and the consumption resistance 7a.
  • the switch 7b is connected in series with the switch 7b, and the consumption resistance control means 22 opens and closes the switch 7b.
  • the purpose of the consumption resistance device 7 is that when the grid connection is stopped due to a power outage or the like while the hydroelectric power generation system is generating power, the system load is no load, the generator 3 is at high speed, and the generated voltage is overvoltage. This is to protect the solar power conditioner 8 by determining that the consumption resistance control means 22 and turning on the switch 7b and consuming overvoltage power with the consumption resistance 7a.
  • the normal state is that the switch b is in the OFF state.
  • the control circuit unit 5 includes power generation control means 12, brake control means 11 for controlling the electromagnetic brake 10, and fail-safe control means 23.
  • the power generation control means 12 is means for controlling the turbine 1 to rotate at an optimum rotational speed by increasing or decreasing the torque of the generator 3 according to the flow velocity.
  • the power generation control means 12 increases or decreases the generator torque according to a predetermined control rule from the flow velocity of the water channel obtained from the anemometer 25 or the rotation speed of the generator 3 detected by the rotation speed detection means 19.
  • the control signal is generated to control the output voltage of the DC / DC converter.
  • the power control unit 34 in the power conditioner 8 is controlled by the control signal.
  • the MPPT control of the general-purpose / photovoltaic power conditioner 8 is used without modification, and control is performed so as to obtain the maximum power at the flow velocity.
  • the control device 4 performs system control such as fail-safe and operation / stop control, and performs control other than MPPT control in the power conditioner 8. Note that the MPPT control of the power conditioner 8 for general purpose / photovoltaic power generation may be stopped and the MPPT control may be performed by the control device 4.
  • the fail safe control means 23 is the voltage, current, and rotation speed detected by the voltmeter 18, the ammeter 17, and the rotation speed detection means 19, and the start, stop, and abnormality output by the power conditioner 8. From the signal, when a predetermined protective operation condition is satisfied, either the input cutoff to the rectifier 15 of the generator 3 or the braking of the electromagnetic brake 10 which is a braking means provided in the generator 1 Or do both.
  • the protection operation condition is, for example, when any of the voltage, current, and rotation speed exceeds a threshold value determined for each, and when a stop or abnormal signal is input from the power conditioner 8. .
  • control device 4 and the power conditioner 8 are connected by communication means such as serial communication LAN communication.
  • control device 4 includes an external I / O unit 21 that performs serial communication LAN communication with an external device.
  • the integrated general-purpose power conditioner 8 is used as it is for the equipment that connects the generated power to the grid 9, it is less expensive than the case of using a specially designed equipment while ensuring quality. It is possible to provide a hydroelectric power generation system.
  • the power conditioner 8 is a power conditioner 8 for photovoltaic power generation
  • solar power generation has been spreading, and many power conditioners for grid interconnection are commercially available with high functionality, durability, and reliability that are inexpensive and of good quality due to mass production effects.
  • By using such a commercially available power conditioner it is possible to construct an even more inexpensive and high-quality hydropower system interconnection system.
  • this hydropower system interconnection system has the following advantages. Since the rectifier 15 that rectifies the generated power has the switch function unit 14, the generator 3 and the system 9 can be disconnected, and the overvoltage power generated by the high-speed rotation of the water turbine 1, the power failure of the system 9, etc. Easy to handle.
  • the consumption resistance device 7 and the consumption resistance control means 22 are provided, it is possible to absorb overvoltage power generated by high-speed rotation of the water turbine 1 or a power failure of the system 9, and this hydraulic power system interconnection system is configured. Degradation and damage due to overvoltage of the equipment can be prevented. Since the fail-safe control means 23 is provided, deterioration and damage due to overvoltage of the devices constituting the hydroelectric power generation system interconnection system can be prevented even better.
  • FIGS. A second embodiment of the present invention will be described with reference to FIGS.
  • the same reference numerals are given to portions corresponding to the matters described in the first embodiment, and the overlapping description is omitted.
  • the other parts of the configuration are the same as those described in advance unless otherwise specified.
  • the control device 4 includes a main circuit unit 6 and a control circuit unit 5 that controls the main circuit unit 6. That is, the control device 4 does not include the consumption resistance device 7.
  • the switch function unit 14 includes switching elements for each phase that open and close a circuit input from the generator 3 to the rectifier function unit 15a.
  • Each switching element of the switch function unit 14 is an element that can be opened and closed by a control input.
  • FIG. 6 shows a specific example of the switch function unit 14.
  • the switch function unit 14 has a thyristor 14a and a diode 14b for each phase, and when a voltage higher than a set voltage acts on the voltage input to the switch function unit 14, the thyristor 14a of each phase is activated.
  • An over-voltage off command means 14c for turning off is provided.
  • the overvoltage-time OFF command means 14c returns the thyristor 14a to ON.
  • a hysteresis may be provided by providing a difference between the voltage to be turned off and the voltage to be turned on to avoid frequent on / off repetitions in the vicinity of the set voltage.
  • the rectifier 15 has the off-voltage off command means 14c.
  • the over-voltage off command means 14c may be provided in the control circuit unit 5.
  • the control for changing the rotational speed of the water turbine 1 by adjusting the load of the generator 3 is performed by the MPPT control of the power conditioner 8 and the control device 4 provided separately from the power conditioner 8. Since the DC generated power is supplied to the power conditioner 8 by performing fail-safe control and AC / DC conversion control according to 4, the general-purpose power conditioner 8 can be used. In this way, the unitary power product 8 that is a commercially available integrated general-purpose product is used without modification in the device that connects the generated power to the grid 9, and the MPPT control function of the power conditioner 8 is also used as it is. Since it uses and controls the rotation speed of the water turbine 1, it is possible to provide an inexpensive hydroelectric power generation system as compared with the case of using a specially designed device while ensuring quality.
  • this hydropower system interconnection system has the following advantages. Since the rectifier 15 that rectifies the generated power has the switch function unit 14, the switch function unit 14 can be turned off so that the generator 3 and the system 9 can be disconnected. It becomes easy to cope with overvoltage power generated by the above. When the switch function unit 14 is turned off, the load on the water wheel 1 is lightened and the water wheel 1 rotates faster. However, the electromagnetic brake 10 applies a braking force to the water wheel 1 to reduce the rotation speed of the water wheel 1. You may make it protect.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

Provided is a system that links with a hydroelectric power generation line, wherein general-purpose components can be used for functional units designed for line interconnections, and costs can be reduced while ensuring quality. The invention comprises a water turbine (1), a generator (3) that converts rotational energy of the water turbine to electrical energy, a rectifier (15) that converts the power generated by this generator (3) to DC power, a power conditioner (8) that converts the DC power rectified by this rectifier (15) to AC power that can be interconnected with a line (9), and a control device (4) that adjusts the load of the generator (3) and controls the rotational speed of the water turbine (1). The power conditioner (8) is an integrated general-purpose component and is, for example, a power conditioner for solar power generation.

Description

水力発電系統連系システムHydropower system interconnection system 関連出願Related applications
　本出願は、２０１８年４月２７日出願の特願２０１８－０８６８３３および特願２０１８－０８６８３４の優先権を主張するものであり、それらの全体を参照により本願の一部をなすものとして引用する。 This application claims the priority of Japanese Patent Application No. 2018-086833 and Japanese Patent Application No. 2018-086834 filed on Apr. 27, 2018, the entire contents of which are hereby incorporated by reference.
　この発明は、小水力発電装置等の水力発電装置を交流商用電力の系統に連系する水力発電系統連系システムに関する。 The present invention relates to a hydroelectric power generation system interconnection system in which a hydroelectric power generation apparatus such as a small hydropower generation apparatus is linked to an AC commercial power system.
　水力発電装置は流水が持つ運動エネルギーを発電に利用するシステムである。主な構成は、水の流れを受け回転する水車、水車と連結され回転エネルギーを電気エネルギーに変換する発電機、発電機の出力及び水車を制御する制御装置から構成される。発電機より取り出す最適な電力は、流速により変化するため、制御装置は、流速あるいは水車の回転速度あるいは発電機の発電電圧を計測し、発電機より取り出す最適な電力を決定し、発電機の電力量と最適値が一致するように制御する。 Hydropower generator is a system that uses the kinetic energy of running water for power generation. The main configuration includes a water wheel that rotates in response to a flow of water, a generator that is connected to the water wheel to convert rotational energy into electric energy, a power generator output, and a control device that controls the water wheel. Since the optimum power to be extracted from the generator varies depending on the flow velocity, the control device measures the flow velocity, the rotation speed of the turbine or the generated voltage of the generator, determines the optimum power to be extracted from the generator, and determines the generator power. Control so that the quantity and the optimum value match.
　水力発電した電力を交流商用電力の系統（以下単に「系統」と称する場合がある）に連系して売電する系統連系システムは、発電機の出力が最大になる様、最大効率トルク、回転速度制御をする為、同期発電機と、同期発電機専用の発電機制御手段（発電機制御ドライバ）及び出力電圧制御手段（系統連系インバータ）で構成されており、同期発電機に合わせた専用設計の機器とされている。 A grid-connected system that sells power generated by hydroelectric power linked to an AC commercial power grid (hereinafter sometimes simply referred to as “grid”) has a maximum efficiency torque so that the output of the generator is maximized. In order to control the rotational speed, it consists of a synchronous generator, a generator control means (generator control driver) dedicated to the synchronous generator, and an output voltage control means (system-connected inverter). It is a specially designed device.
　例えば図７に示すように、水力発電装置の発電機５１の３相交流の出力を直流に変換する電力変換回路５２、その制御手段である発電機制御手段５３と、直流を系統５４に応じた交流電力に変換するインバータ５５およびその出力電圧制御手段５６からなる系統連系インバータとで系統連系システムが構成されている（例えば、特許文献１）。 For example, as shown in FIG. 7, the power conversion circuit 52 that converts the output of the three-phase alternating current of the generator 51 of the hydroelectric generator into direct current, the generator control means 53 that is the control means, and the direct current according to the system 54 A grid interconnection system is constituted by a grid interconnection inverter composed of an inverter 55 that converts AC power and its output voltage control means 56 (for example, Patent Document 1).
特開２００７－６５５３号公報JP 2007-6553 A
　従来の系統連系水力発電システムの構成は、同期発電機、同期発電機専用の発電機制御手段（発電機制御ドライバ）及び出力電圧制御手段（系統連系インバータ）で構成されており、発電機に合わせた専用設計の機器である為、機器が高額となる。そのため、農業用水や工業用水等の用水路等に設置される小発電電力の発電装置、いわゆる小水力発電装置では、システム全体における系統連系のための電気系の機器が占めるコストの割合が多くなり、不経済である。 The configuration of a conventional grid-connected hydroelectric power generation system includes a synchronous generator, a generator control means (generator control driver) dedicated to the synchronous generator, and an output voltage control means (system-connected inverter). Because it is a specially designed device tailored to the equipment, the equipment is expensive. Therefore, in the power generation device for small power generation installed in irrigation channels such as agricultural water and industrial water, so-called small hydroelectric power generation device, the ratio of the cost occupied by electrical equipment for grid connection in the entire system increases. It is uneconomical.
　この発明は上記課題を解消するものであり、その目的は、系統連系のための手段に汎用品が使用できて、品質を確保しながら、コスト低下が図れる水力発電系統連系システムを提供することである。 SUMMARY OF THE INVENTION The present invention solves the above problems, and an object of the present invention is to provide a hydroelectric power grid interconnection system in which a general-purpose product can be used as a means for grid interconnection, and the cost can be reduced while ensuring quality. That is.
　以下、便宜上理解を容易にするために、実施形態の符号を参照して説明する。 Hereinafter, in order to facilitate understanding, description will be made with reference to the reference numerals of the embodiments.
　この発明の水力発電系統連系システムは、水車１と、水車１の回転エネルギーを電気エネルギーに変換する発電機３と、この発電機３の発電電力を直流電力に変換する整流器１５と、この整流器１５で整流した直流電力を系統９に連系可能な交流電力に変換するパワーコンディショナ８と、前記発電機３の負荷を調整して前記水車１の回転数を制御する制御装置４とを備え、
　前記パワーコンディショナ８が、一体の汎用品である。 The hydropower system interconnection system of the present invention includes a water turbine 1, a generator 3 that converts rotational energy of the water turbine 1 into electric energy, a rectifier 15 that converts the generated power of the generator 3 into DC power, and the rectifier 15 includes a power conditioner 8 that converts the DC power rectified in 15 into AC power that can be connected to the grid 9, and a control device 4 that controls the rotational speed of the water turbine 1 by adjusting the load of the generator 3. ,
The power conditioner 8 is an integral general-purpose product.
　この構成によると、発電機３の負荷の調整により水車１の回転数を変える制御は、パワーコンディショナ８とは別に設けた前段の制御装置４およびパワーコンディショナ８の最大電力点制御（ＭＰＰＴ制御）等で行い、制御装置４にて交流/直流変換制御を行うことで直流に変換した発電電力をパワーコンディショナ８に供給するようにしたため、汎用のパワーコンディショナ８を用いることが可能となる。このように、発電電力を系統９に連系する機器に、一体の汎用品のパワーコンディショナ８をそのまま利用するため、品質を確保しながら、専用設計の機器を用いる場合に比べて安価な水力発電システムを提供する事が可能となる。 According to this configuration, the control for changing the rotation speed of the water turbine 1 by adjusting the load of the generator 3 is performed by controlling the maximum power point control (MPPT control) of the control device 4 and the power conditioner 8 provided separately from the power conditioner 8. ) And the like, and the generated power converted into direct current is supplied to the power conditioner 8 by performing the AC / DC conversion control in the control device 4, so that the general-purpose power conditioner 8 can be used. . In this way, since the integrated general-purpose power conditioner 8 is used as it is for the equipment that connects the generated power to the grid 9, it is cheaper than the case of using a specially designed equipment while ensuring quality. It is possible to provide a power generation system.
　なお、この明細書で言う「汎用品」は、特定の機種の発電装置に専用に設計されたものではなく、入力が処理可能な電力、電圧の範囲であり、かつ連系する系統９の電圧および周波数が適合すれば、適用できる機器であることを言う。また、「一体の汎用品」は、全ての構成部品が共通の筐体に組み込まれ、一つの物として取扱可能な汎用品を言う。 The “general-purpose product” referred to in this specification is not designed exclusively for a specific type of power generator, but is a range of power and voltage that can be processed by input, and the voltage of the grid 9 connected to the system. And if the frequency is matched, it means that the device is applicable. An “integrated general-purpose product” refers to a general-purpose product in which all components are incorporated in a common housing and can be handled as a single object.
　前記パワーコンディショナ８は、前記パワーコンディショナ８が、太陽光発電の系統９への連系向けの汎用品であってもよい。すなわち、太陽電池セルが組み合わせられた太陽電池パネルを系統９に連系するパワーコンディショナ８であってもよい。太陽光発電は普及が進んでおり、系統連系用のパワーコンディショナ８につき、量産効果によって安価で品質の良いものが多く市販されている。このような市販のパワーコンディショナ８を用いることで、より一層安価で高品質の水力発電系統連系システムを構築することができる。 The power conditioner 8 may be a general-purpose product for connection to the solar power generation system 9. That is, the power conditioner 8 which connects the solar cell panel with which the photovoltaic cell was combined with the system | strain 9 may be sufficient. Photovoltaic power generation is spreading, and many power conditioners 8 for grid interconnection are commercially available at low cost and high quality due to mass production effects. By using such a commercially available power conditioner 8, it is possible to construct an even more inexpensive and high-quality hydropower system interconnection system.
　前記整流器１５が、整流を行う整流機能部１５ａと、前記発電機３の発電電力の前記整流機能部１５ａへの入力をオンオフするスイッチ機能部１４とを有するものであってもよい。発電電力を整流する整流器１５にオンオフするスイッチ機能を持っていれば、発電機３と系統９とを切り離すことができて、水車１の高速回転や系統９の停電等により生じる過電圧電力への対応が容易となる。 The rectifier 15 may include a rectification function unit 15a that performs rectification and a switch function unit 14 that turns on and off the input of the power generated by the generator 3 to the rectification function unit 15a. If the rectifier 15 for rectifying the generated power has a switch function for turning it on and off, the generator 3 and the system 9 can be disconnected, and it is possible to cope with overvoltage power caused by high-speed rotation of the turbine 1 or power failure of the system 9. Becomes easy.
　前記発電機３と前記パワーコンディショナ８との間に接続され過電圧電力を抵抗によって吸収する消費抵抗装置と、前記発電機３の発電電力が設定電圧以上の過電圧になった時に前記発電機３の発電電力に発生する過電圧電力を前記消費抵抗装置に吸収させる消費抵抗制御手段とを備えていてもよい。このように消費抵抗装置およびその消費抵抗制御手段を備えていると、水車１の高速回転や系統９の停電等により生じる過電圧電力を吸収することができ、この水力発電系統連系システムを構成する機器の過電圧による劣化や損傷を防止することができる。 A consumption resistance device that is connected between the generator 3 and the power conditioner 8 and absorbs overvoltage power by resistance, and when the generated power of the generator 3 becomes an overvoltage higher than a set voltage, Consumption resistance control means for causing the consumption resistance device to absorb overvoltage power generated in the generated power may be provided. When the consumption resistance device and the consumption resistance control means are provided in this way, it is possible to absorb the overvoltage power generated by the high speed rotation of the water turbine 1 or the power failure of the system 9, and this hydraulic power system interconnection system is configured. Degradation and damage due to overvoltage of the equipment can be prevented.
　前記制御装置は、前記整流機能部がオフであるときに発電電力を抵抗によって消費させる手段を有さなくてもよい。 The control device may not have means for consuming the generated power by resistance when the rectifying function unit is off.
　前記整流器１５が、前記発電機３の発電電力の前記整流機能部１５ａへの入力をオンオフさせるスイッチ機能部１４を有するため、水車１の高速回転等よる過電圧電力に対して制御装置４やパワーコンディショナ８の保護が図れる。前記制御装置４は、前記整流機能部１５ａがオフであるときに発電電力を抵抗によって消費させる手段を有しないため、消費抵抗手段によるコスト増を抑えることができる。水車１の高速回転は、ブレーキ手段等を設けることで対処可能である。 Since the rectifier 15 has a switch function unit 14 for turning on and off the input of the power generated by the generator 3 to the rectification function unit 15a, the control device 4 and the power condition are protected against overvoltage power caused by high-speed rotation of the water turbine 1. Na 8 can be protected. Since the control device 4 does not have means for consuming generated power by resistance when the rectifying function unit 15a is off, an increase in cost due to consumption resistance means can be suppressed. The high speed rotation of the water turbine 1 can be dealt with by providing a brake means or the like.
　前記発電機３の前記整流器１５で整流された電圧を計測する電圧検出手段１８と、
　前記発電機３の前記整流器１５で整流された電流を計測する電流検出手段１７と、
　前記電流検出手段１７で検出した電流を演算する電流演算手段と、
　前記発電機３の発電電力の周波数から前記発電機３の回転数を検出する回転数検出手段１９と、
　前記電圧検出手段１８、前記電流検出手段１７、および前記回転数検出手段１９が検出した電圧、電流、および回転数、並びに前記パワーコンディショナ８が出力する起動、停止、および異常信号から、定められた保護作動条件を充足する場合に、前記発電機３の前記整流器１５への入力遮断および前記発電機３に備えられた制動手段１０の制動のいずれか一方または両方を行わせるフェールセーフ制御手段２３を有してもよい。 Voltage detection means 18 for measuring the voltage rectified by the rectifier 15 of the generator 3;
Current detection means 17 for measuring the current rectified by the rectifier 15 of the generator 3;
Current calculating means for calculating the current detected by the current detecting means 17;
Rotational speed detection means 19 for detecting the rotational speed of the generator 3 from the frequency of the generated power of the generator 3;
It is determined from the voltage, current, and rotation speed detected by the voltage detection means 18, the current detection means 17, and the rotation speed detection means 19, and the start, stop, and abnormal signals output from the power conditioner 8. Fail safe control means 23 for performing either one or both of shutting off the input to the rectifier 15 of the generator 3 and braking of the braking means 10 provided in the generator 3 when the protection operating condition is satisfied. You may have.
　このようなフェールセーフ制御手段２３を有することで、この水力発電系統連系システムを構成する機器の前記過電圧による劣化や損傷をより一層良好に防止することができる。 By having such a fail-safe control means 23, it is possible to more satisfactorily prevent deterioration and damage due to the overvoltage of the devices constituting the hydroelectric power system interconnection system.
　代わりの実施形態において、前記発電機３の前記整流器１５で整流された電圧を計測する電圧検出手段１８と、
　前記発電機３の前記整流器１５で整流された電流を計測する電流検出手段１７と、
　前記電流検出手段１７で検出した電流を演算する電流演算手段と、
　前記発電機３の発電電力の周波数から前記発電機３の回転数を検出する回転数検出手段１９と、
　前記電圧検出手段１８、前記電流検出手段１７、および前記回転数検出手段１９が検出した電圧、電流、および回転数、並びに前記パワーコンディショナ８が出力する起動、停止、および異常信号から、定められた保護作動条件を充足する場合に、前記発電機３の前記整流器１５の前記スイッチ機能部１４へのオフの指令および前記発電機３に備えられた制動手段１０の制動のいずれか一方または両方を行わせるフェールセーフ制御手段２３を有してもよい。 In an alternative embodiment, voltage detection means 18 for measuring the voltage rectified by the rectifier 15 of the generator 3;
Current detection means 17 for measuring the current rectified by the rectifier 15 of the generator 3;
Current calculating means for calculating the current detected by the current detecting means 17;
Rotational speed detection means 19 for detecting the rotational speed of the generator 3 from the frequency of the generated power of the generator 3;
It is determined from the voltage, current, and rotation speed detected by the voltage detection means 18, the current detection means 17, and the rotation speed detection means 19, and the start, stop, and abnormal signals output from the power conditioner 8. When the protection operation condition is satisfied, either or both of the command to turn off the switch function unit 14 of the rectifier 15 of the generator 3 and the braking of the braking means 10 provided in the generator 3 are performed. You may have the fail safe control means 23 to perform.
　このようなフェールセーフ制御手段２３を有することで、この水力発電系統連系システムを構成する機器の前記過電圧による劣化や損傷をより一層良好に防止することができる。 By having such a fail-safe control means 23, it is possible to more satisfactorily prevent deterioration and damage due to the overvoltage of the devices constituting the hydroelectric power system interconnection system.
　請求の範囲および／または明細書および／または図面に開示された少なくとも２つの構成のどのような組合せも、本発明に含まれる。特に、請求の範囲の各請求項の２つ以上のどのような組合せも、本発明に含まれる。 Any combination of at least two configurations disclosed in the claims and / or the specification and / or drawings is included in the present invention. In particular, any combination of two or more of each claim in the claims is included in the present invention.
　この発明は、添付の図面を参考にした以下の好適な実施形態の説明から、より明瞭に理解されるであろう。しかしながら、実施形態および図面は単なる図示および説明のためのものであり、この発明の範囲を定めるために利用されるべきものではない。この発明の範囲は添付の請求の範囲によって定まる。添付図面において、複数の図面における同一の符号は、同一または相当する部分を示す。
この発明の第１の実施形態に係る水力発電系統連系システムの概念構成を示すブロック図である。 図１の水力発電系統連系システムの具体例のブロック図である。 図１の水力発電系統連系システムに用いた太陽光発電用のパワーコンディショナの概念構成を示すブロック図である。 この発明の第２の実施形態に係る水力発電系統連系システムの概念構成を示すブロック図である。 図４の水力発電系統連系システムの具体例のブロック図である。 図４の水力発電系統連系システムにおける整流器の説明図である。 従来例の電気回路図である。 The present invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and drawings are merely for illustration and description, and should not be used to define the scope of the present invention. The scope of the invention is defined by the appended claims. In the accompanying drawings, the same reference numerals in a plurality of drawings indicate the same or corresponding parts.
It is a block diagram which shows the conceptual structure of the hydroelectric power system interconnection system which concerns on 1st Embodiment of this invention. It is a block diagram of the specific example of the hydroelectric power system interconnection system of FIG. It is a block diagram which shows the conceptual structure of the power conditioner for solar power generation used for the hydroelectric power system interconnection system of FIG. It is a block diagram which shows the conceptual structure of the hydroelectric power system interconnection system which concerns on 2nd Embodiment of this invention. It is a block diagram of the specific example of the hydroelectric power system interconnection system of FIG. It is explanatory drawing of the rectifier in the hydroelectric power system interconnection system of FIG. It is an electric circuit diagram of a conventional example.
　この発明の第１の実施形態を図１ないし図３と共に説明する。図１に示す水力発電機は、水車１が水平軸型（プロペラ型）の水力発電機の例である。水車１は、農業用水、工業用水等の水路、または上下水道等に設置される比較的に小型の水車である。水の運動エネルギーにより水車１が回転し、水車１の主軸１ａが発電機３を回転させる。水車１と発電機３とで水力発電装置２が構成される。水力発電装置２には、水車１または発電機３を制動する電磁ブレーキ１０等の制動手段が設けられている。 A first embodiment of the present invention will be described with reference to FIGS. The hydroelectric generator shown in FIG. 1 is an example of a hydroelectric generator in which the hydraulic turbine 1 is a horizontal axis type (propeller type). The water wheel 1 is a relatively small water wheel installed in a waterway such as agricultural water, industrial water, or water and sewage. The water wheel 1 is rotated by the kinetic energy of water, and the main shaft 1 a of the water wheel 1 rotates the generator 3. A hydroelectric generator 2 is constituted by the turbine 1 and the generator 3. The hydroelectric generator 2 is provided with braking means such as an electromagnetic brake 10 that brakes the water turbine 1 or the generator 3.
　発電機３は、制御装置４およびパワーコンディショナ８を介して系統９に接続される。系統９は、交流商用電力系統であり、例えば１００Ｖまたは２００Ｖで５０または６０Ｈｚの低電圧配線である。 The generator 3 is connected to the system 9 via the control device 4 and the power conditioner 8. The system 9 is an AC commercial power system, for example, 100V or 200V, 50 or 60 Hz low voltage wiring.
　前記水車１、発電機３、制御装置４、およびパワーコンディショナ８により水力発電系統連系システムが構成される。 The hydro turbine 1, the generator 3, the control device 4, and the power conditioner 8 constitute a hydroelectric power system interconnection system.
　発電機３は、永久磁石を使用した三相同期発電機であり、主軸１ａにカップリング（図示せず）等で締結されている。必要に応じて主軸１ａと発電機３の間に増速機（図示せず）が設けられる。発電機３に負荷を接続して出力をとると、水車１に発電機３からトルクがかかり、水車１の回転が制動される。負荷を重くすると水車１の回転速度は遅くなり、負荷を軽くすると水車１の回転速度は速くなる。発電機３の負荷として制御装置４およびパワーコンディショナ８、系統９が接続されている。 The generator 3 is a three-phase synchronous generator using a permanent magnet, and is fastened to the main shaft 1a by a coupling (not shown) or the like. A speed increaser (not shown) is provided between the main shaft 1a and the generator 3 as necessary. When a load is connected to the generator 3 and an output is taken, torque is applied to the turbine 1 from the generator 3, and the rotation of the turbine 1 is braked. When the load is increased, the rotation speed of the water turbine 1 is decreased. When the load is decreased, the rotation speed of the water turbine 1 is increased. A control device 4, a power conditioner 8, and a system 9 are connected as a load of the generator 3.
　制御装置４およびパワーコンディショナ８は、水路の流速に応じて発電機３のトルクを増減させ水車１が最適な回転数で回転するように制御する。水路の流速は、流速計２５で検出する。流速に代え、または流速と併用して、水車１の回転数、または発電機３の回転数に応じて発電機３のトルクを増減させるようにしてもよい。発電機３の回転数は発電電力の周波数から検出してもよい。水車１の回転数と発電機３の回転数とは定まった関係にあり、いずれか一方が検出できれば他方は演算で分かる。 The control device 4 and the power conditioner 8 increase or decrease the torque of the generator 3 according to the flow velocity of the water channel so as to control the water turbine 1 to rotate at an optimum rotation speed. The flow velocity of the water channel is detected by an anemometer 25. Instead of the flow rate or in combination with the flow rate, the torque of the generator 3 may be increased or decreased according to the rotation speed of the water turbine 1 or the rotation speed of the generator 3. The rotational speed of the generator 3 may be detected from the frequency of the generated power. The rotational speed of the water turbine 1 and the rotational speed of the generator 3 are in a fixed relationship, and if one of them can be detected, the other can be found by calculation.
　制御装置４は、主回路部６と、この主回路部６を制御する制御回路部５と、消費抵抗装置７とを備える。主回路部６に、発電機３の３相交流電力を直流に変換する整流器１５と、その整流した直流を昇圧するＤＣ／ＤＣコンバータ１６が設けられている。ＤＣ／ＤＣコンバータ１６は、例えば、昇圧側となる２次側の電圧が制御入力によって制御可能なものを用いている。 The control device 4 includes a main circuit unit 6, a control circuit unit 5 that controls the main circuit unit 6, and a consumption resistance device 7. The main circuit unit 6 is provided with a rectifier 15 that converts the three-phase AC power of the generator 3 into a direct current and a DC / DC converter 16 that boosts the rectified direct current. The DC / DC converter 16 uses, for example, a voltage that can control the voltage on the secondary side that is the boost side by a control input.
　前記パワーコンディショナ８は、系統９に並列接続して連系する装置であり、入力された直流電力を系統９と同等の電圧(少し高い電圧)、周波数、および位相の交流電力に変換する。このパワーコンディショナ８として、一体の汎用品が用いられている。すなわち、筐体内に構成部品（いずれも図示せず）が収められ一体の機器として取扱可能な汎用品が用いられている。この実施形態では、パワーコンディショナ８として、太陽光発電の発電電力を系統９に連系可能な交流電力に変換する太陽光発電向けに量産されているパワーコンディショナを用いている。 The power conditioner 8 is a device connected in parallel with the system 9 and converts the input DC power into AC power having a voltage (slightly higher voltage), frequency, and phase equivalent to the system 9. As this power conditioner 8, an integral general-purpose product is used. That is, a general-purpose product that can be handled as an integrated device in which components (not shown) are housed in a housing is used. In this embodiment, as the power conditioner 8, a power conditioner that is mass-produced for photovoltaic power generation that converts the generated power of the photovoltaic power generation into AC power that can be connected to the grid 9 is used.
　図３は、この実施形態に用いる太陽光発電用のパワーコンディショナ８の一例を示す。このパワーコンディショナ８は、ＤＣ／ＤＣコンバータ３１と、ＤＣ／ＡＣインバータ３２と、制御手段３３とを備える。ＤＣ／ＤＣコンバータ３１は、入力された直流電力を系統９の電圧に対応する電圧に昇圧させる手段であり、出力電圧が可変である。ＤＣ／ＤＣコンバータ３１の入力電圧は、このパワーコンディショナ８の本来の用途である太陽電池モジュール３６の出力電圧であり、一般的な太陽光発電で系統連系のために出力させる電圧のうちのいずれかの電圧(例えば、単相１００/２００Ｖまたは３相２００Ｖ)とされている。ＤＣ／ＡＣインバータ３２は、ＤＣ／ＤＣコンバータ３１から出力された直流電力を、系統９に連系可能な周波数および位相の交流電力に変換する。 FIG. 3 shows an example of a power conditioner 8 for photovoltaic power generation used in this embodiment. The power conditioner 8 includes a DC / DC converter 31, a DC / AC inverter 32, and a control means 33. The DC / DC converter 31 is a means for boosting the input DC power to a voltage corresponding to the voltage of the system 9, and the output voltage is variable. The input voltage of the DC / DC converter 31 is the output voltage of the solar cell module 36 which is the original use of the power conditioner 8, and is the voltage output for grid connection in general solar power generation. One of the voltages (for example, single phase 100 / 200V or three phase 200V) is used. The DC / AC inverter 32 converts the DC power output from the DC / DC converter 31 into AC power having a frequency and phase that can be linked to the system 9.
　前記制御手段３３は、電力制御部３４と最大電力点制御部３５とを有する。電力制御部３４は、ＤＣ／ＤＣコンバータ３１およびＤＣ／ＡＣインバータ３２に対して基本的な制御を行う。最大電力点制御部３５は、山登り法による最大電力点追尾制御（ＭＰＰＴ制御）を行うように、前記電力制御部３４に指令を与える。 The control means 33 includes a power control unit 34 and a maximum power point control unit 35. The power control unit 34 performs basic control on the DC / DC converter 31 and the DC / AC inverter 32. The maximum power point control unit 35 gives a command to the power control unit 34 so as to perform maximum power point tracking control (MPPT control) by the hill-climbing method.
　ＭＰＰＴ制御につき説明する。太陽電池モジュール３６等の発電機器の発電量は、電圧と電流の積で決まるが、発電する電圧と電流は変動する。この変動に対して、最大電力点追尾制御部３５によるＭＰＰＴ制御では、最大の出力が発生するように電圧と電流の組み合わせとなる動作点を常に探し求める。前記電力制御部３４は、上記のように最大電力点制御部３５で求められた動作点で働くように、ＤＣ／ＤＣコンバータ３１およびＤＣ／ＡＣインバータ３２を制御する。 The MPPT control will be described. The amount of power generated by a power generation device such as the solar cell module 36 is determined by the product of the voltage and current, but the generated voltage and current vary. In response to this variation, the MPPT control by the maximum power point tracking control unit 35 always searches for an operating point that is a combination of voltage and current so that the maximum output is generated. The power control unit 34 controls the DC / DC converter 31 and the DC / AC inverter 32 so as to work at the operating point obtained by the maximum power point control unit 35 as described above.
　この実施形態の場合、発電機３の発電電力の変動により、整流されてパワーコンディショナ８に入力される電力の電流、電圧の変動が生じるが、この変動に対して、最大電力点制御部３５が上記の機能を果たす。 In the case of this embodiment, fluctuations in the current and voltage of the power that is rectified and input to the power conditioner 8 occur due to fluctuations in the generated power of the generator 3. Fulfills the above functions.
　なお、制御手段３３は、最大電力点制御部３５を設けずに、例えばパルス幅変調方式で制御をＤＣ／ＤＣコンバータ３１およびＤＣ／ＡＣインバータ３２を制御する構成であってもよい。 The control unit 33 may be configured to control the DC / DC converter 31 and the DC / AC inverter 32 by, for example, a pulse width modulation method without providing the maximum power point control unit 35.
　図２は、発電機３とパワーコンディショナ８との間に設けられる前記制御装置４の具体的構成例を示す。主回路部６は、前記整流器１５およびＤＣ／ＤＣコンバータ１６の他に、ＡＣ／ＤＣ制御電源１３、電流検出手段である電流計１７、回転数検出手段１９、および電圧検出手段である電圧計１８を有する。 FIG. 2 shows a specific configuration example of the control device 4 provided between the generator 3 and the power conditioner 8. In addition to the rectifier 15 and the DC / DC converter 16, the main circuit unit 6 includes an AC / DC control power source 13, an ammeter 17 as current detection means, a rotation speed detection means 19, and a voltmeter 18 as voltage detection means. Have
　前記整流器１５は、発電機３の３相交流の発電電力を直流に変換する手段であり、この変換を行う整流機機能部１５ａと、スイッチ機能部１４とを有する。整流機機能部１５ａは、各相毎に出力の正電位側と負電位側とに位置する２つの半導体スイッング素子（図示せず）が設けられたハーフブリッジ回路からなる。 The rectifier 15 is means for converting the three-phase AC generated power of the generator 3 into direct current, and has a rectifier function unit 15a for performing this conversion and a switch function unit 14. The rectifier function unit 15a is composed of a half-bridge circuit in which two semiconductor switching elements (not shown) positioned on the positive potential side and the negative potential side of the output are provided for each phase.
　スイッチ機能部１４は、発電機３から整流機機能部１５ａに入力される回路を開閉する各相のスイッチング素子（図示せず）で構成される。スイッチ機能部１４の各スイッチング素子は、制御入力によって開閉可能な素子である。 The switch function unit 14 includes switching elements (not shown) for each phase that open and close a circuit that is input from the generator 3 to the rectifier function unit 15a. Each switching element of the switch function unit 14 is an element that can be opened and closed by a control input.
　ＡＣ／ＤＣ制御電源１３は、制御装置４を動作させる電源であり、発電機３の発電する交流電力の一部を直流電力に変換し、制御回路部５および消費抵抗装置７に供給する。ＡＣ／ＤＣ制御電源１３の代わりに、電池等の別の電源を用いてもよい。電流計１７は、ＤＣ／ＤＣコンバータ１６により昇圧された電流の電流値を検出する。電圧計１８は、同じく昇圧された電流の電圧値を検出する。つまり、電流計１７および電圧計１８は、パワーコンディショナ８に入力される電流および電圧を検出する。回転数検出手段１９は、発電電流の周波数から発電機３の回転数を検出する。この検出は、整流器１５の整流前の電力に対して行っている。 The AC / DC control power supply 13 is a power supply for operating the control device 4, converts a part of the AC power generated by the generator 3 into DC power, and supplies the DC power to the control circuit unit 5 and the consumption resistance device 7. Instead of the AC / DC control power supply 13, another power supply such as a battery may be used. The ammeter 17 detects the current value of the current boosted by the DC / DC converter 16. The voltmeter 18 detects the voltage value of the boosted current. That is, the ammeter 17 and the voltmeter 18 detect the current and voltage input to the power conditioner 8. The rotation speed detection means 19 detects the rotation speed of the generator 3 from the frequency of the generated current. This detection is performed on the power before rectification of the rectifier 15.
　消費抵抗装置７は、風車１の回転制御や回路保護等のために、発電機３で発電した電力を消費する手段である。消費抵抗装置７は、この実施形態では、ＤＣ／ＤＣコンバータ１６とパワーコンディショナ８との間で、正電位側配線と負電位側とを短絡させて電力消費する消費抵抗７ａと、この消費抵抗７ａに直列接続されたスイッチ７ｂと、このスイッチ７ｂを開閉させる消費抵抗制御手段２２とで構成される。 The consumption resistance device 7 is means for consuming electric power generated by the generator 3 for rotation control of the windmill 1, circuit protection, and the like. In this embodiment, the consumption resistance device 7 includes a consumption resistance 7a for short-circuiting the positive potential side wiring and the negative potential side between the DC / DC converter 16 and the power conditioner 8, and the consumption resistance 7a. The switch 7b is connected in series with the switch 7b, and the consumption resistance control means 22 opens and closes the switch 7b.
　消費抵抗装置７の目的は、水力発電システムが発電中に、電力系統の停電時などで系統連系が停止した時、系統負荷が無負荷となり発電機３が高回転、発電電圧が過電圧となったことを消費抵抗制御手段２２で判定してスイッチ７ｂをＯＮして消費抵抗７ａで過電圧電力を消費させる事で、太陽光パワーコンディショナ８を保護する事である。通常の状態は、スイッチｂがＯＦＦ状態である。 The purpose of the consumption resistance device 7 is that when the grid connection is stopped due to a power outage or the like while the hydroelectric power generation system is generating power, the system load is no load, the generator 3 is at high speed, and the generated voltage is overvoltage. This is to protect the solar power conditioner 8 by determining that the consumption resistance control means 22 and turning on the switch 7b and consuming overvoltage power with the consumption resistance 7a. The normal state is that the switch b is in the OFF state.
　前記制御回路部５は、発電制御手段１２と、前記電磁ブレーキ１０を制御するブレーキ制御手段１１と、フェールセーフ制御手段２３とを有する。発電制御手段１２は、前記の流速に応じて発電機３のトルクを増減させ水車１が最適な回転数で回転するように制御する手段である。発電制御手段１２は、前記流速計２５から得られた水路の流速、または前記回転数検出手段１９で検出された発電機３の回転数から、定められた制御規則に従って発電機トルクの増減のための制御信号を生成し、ＤＣ／ＤＣコンバータの出力電圧を制御する。あるいは、前記制御信号により、前記パワーコンディショナ８における前記電力制御部３４に制御させる。 The control circuit unit 5 includes power generation control means 12, brake control means 11 for controlling the electromagnetic brake 10, and fail-safe control means 23. The power generation control means 12 is means for controlling the turbine 1 to rotate at an optimum rotational speed by increasing or decreasing the torque of the generator 3 according to the flow velocity. The power generation control means 12 increases or decreases the generator torque according to a predetermined control rule from the flow velocity of the water channel obtained from the anemometer 25 or the rotation speed of the generator 3 detected by the rotation speed detection means 19. The control signal is generated to control the output voltage of the DC / DC converter. Alternatively, the power control unit 34 in the power conditioner 8 is controlled by the control signal.
　この場合に、汎用/太陽光発電用のパワーコンディショナ８のＭＰＰＴ制御をそのまま改造する事無く利用して、流速での最大電力が取れるよう制御する。同時に、制御装置４にて、フェールセーフ、運転/停止制御などのシステム制御を実施してパワーコンディショナ８でのＭＰＰＴ制御を以外の制御を実施する。なお、汎用/太陽光発電用のパワーコンディショナ８のＭＰＰＴ制御を停止させて、制御装置４にてＭＰＰＴ制御を実施する事としてもよい。 In this case, the MPPT control of the general-purpose / photovoltaic power conditioner 8 is used without modification, and control is performed so as to obtain the maximum power at the flow velocity. At the same time, the control device 4 performs system control such as fail-safe and operation / stop control, and performs control other than MPPT control in the power conditioner 8. Note that the MPPT control of the power conditioner 8 for general purpose / photovoltaic power generation may be stopped and the MPPT control may be performed by the control device 4.
　フェールセーフ制御手段２３は、前記電圧計１８、前記電流計１７、および前記回転数検出手段１９が検出した電圧、電流、および回転数、並びに前記パワーコンディショナ８が出力する起動、停止、および異常信号から、定められた保護作動条件を充足する場合に、前記発電機３の前記整流器１５への入力遮断、および前記発電機１に備えられた制動手段である電磁ブレーキ１０の制動のいずれか一方または両方を行わせる。前記保護作動条件は、例えば、前記電圧、電流、および回転数のいずれかが、それぞれにつき定められた閾値を超える場合、および前記パワーコンディショナ８から停止または異常信号が入力されたときとされる。 The fail safe control means 23 is the voltage, current, and rotation speed detected by the voltmeter 18, the ammeter 17, and the rotation speed detection means 19, and the start, stop, and abnormality output by the power conditioner 8. From the signal, when a predetermined protective operation condition is satisfied, either the input cutoff to the rectifier 15 of the generator 3 or the braking of the electromagnetic brake 10 which is a braking means provided in the generator 1 Or do both. The protection operation condition is, for example, when any of the voltage, current, and rotation speed exceeds a threshold value determined for each, and when a stop or abnormal signal is input from the power conditioner 8. .
　前記制御装置４とパワーコンディショナ８とは、シリアル通信のＬＡＮ通信等による通信手段で接続されている。また、前記制御装置４は、外部の機器とシリアル通信のＬＡＮ通信等を行う外部Ｉ／Ｏ手段２１を有している。 The control device 4 and the power conditioner 8 are connected by communication means such as serial communication LAN communication. In addition, the control device 4 includes an external I / O unit 21 that performs serial communication LAN communication with an external device.
　この構成によると、発電電力を系統９に連系する機器に、一体の汎用品のパワーコンディショナ８をそのまま利用するため、品質を確保しながら、専用設計の機器を用いる場合に比べて安価な水力発電システムを提供する事が可能となる。 According to this configuration, since the integrated general-purpose power conditioner 8 is used as it is for the equipment that connects the generated power to the grid 9, it is less expensive than the case of using a specially designed equipment while ensuring quality. It is possible to provide a hydroelectric power generation system.
　前記パワーコンディショナ８が太陽光発電用のパワーコンディショナ８である場合は、より一層安価で高品質の水力発電系統連系システムを構築することができる。すなわち、太陽光発電は普及が進んでおり、系統連系用のパワーコンディショナにつき、量産効果によって高機能で耐久性、信頼性に優れた安価で品質の良いものが多く市販されている。このような市販のパワーコンディショナを用いることで、より一層安価で高品質の水力発電系統連系システムを構築することができる。 When the power conditioner 8 is a power conditioner 8 for photovoltaic power generation, it is possible to construct a hydroelectric power generation system interconnection system that is much cheaper and higher quality. In other words, solar power generation has been spreading, and many power conditioners for grid interconnection are commercially available with high functionality, durability, and reliability that are inexpensive and of good quality due to mass production effects. By using such a commercially available power conditioner, it is possible to construct an even more inexpensive and high-quality hydropower system interconnection system.
　また、この水力発電系統連系システムは、次の各利点が得られる。
　発電電力を整流する整流器１５にスイッチ機能部１４を有しているため、発電機３と系統９とを切り離すことができて、水車１の高速回転や系統９の停電等により生じる過電圧電力への対応が容易となる。 In addition, this hydropower system interconnection system has the following advantages.
Since the rectifier 15 that rectifies the generated power has the switch function unit 14, the generator 3 and the system 9 can be disconnected, and the overvoltage power generated by the high-speed rotation of the water turbine 1, the power failure of the system 9, etc. Easy to handle.
　前記消費抵抗装置７およびその消費抵抗制御手段２２を備えているため、水車１の高速回転や系統９の停電等により生じる過電圧電力を吸収することができ、この水力発電系統連系システムを構成する機器の過電圧による劣化や損傷を防止することができる。前記フェールセーフ制御手段２３を有するため、この水力発電系統連系システムを構成する機器の過電圧による劣化や損傷をより一層良好に防止することができる。 Since the consumption resistance device 7 and the consumption resistance control means 22 are provided, it is possible to absorb overvoltage power generated by high-speed rotation of the water turbine 1 or a power failure of the system 9, and this hydraulic power system interconnection system is configured. Degradation and damage due to overvoltage of the equipment can be prevented. Since the fail-safe control means 23 is provided, deterioration and damage due to overvoltage of the devices constituting the hydroelectric power generation system interconnection system can be prevented even better.
　この発明の第２の実施形態を図４ないし図６と共に説明する。以下の説明においては、第１の実施形態で先行して説明している事項に対応している部分には同一の参照符号を付し、重複する説明を略する。構成の一部のみを説明している場合、構成の他の部分は、特に記載のない限り先行して説明している形態と同様とする。 A second embodiment of the present invention will be described with reference to FIGS. In the following description, the same reference numerals are given to portions corresponding to the matters described in the first embodiment, and the overlapping description is omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in advance unless otherwise specified.
　本実施形態では、図４および図５に示すように、制御装置４は、主回路部６と、この主回路部６を制御する制御回路部５とを備える。つまり、制御装置４は、消費抵抗装置７を備えていない。 In this embodiment, as shown in FIGS. 4 and 5, the control device 4 includes a main circuit unit 6 and a control circuit unit 5 that controls the main circuit unit 6. That is, the control device 4 does not include the consumption resistance device 7.
　本実施形態では、また、第１実施形態と同様に、スイッチ機能部１４は、発電機３から整流機機能部１５ａに入力される回路を開閉する各相のスイッチング素子で構成される。スイッチ機能部１４の各スイッチング素子は、制御入力によって開閉可能な素子である。 In this embodiment, as in the first embodiment, the switch function unit 14 includes switching elements for each phase that open and close a circuit input from the generator 3 to the rectifier function unit 15a. Each switching element of the switch function unit 14 is an element that can be opened and closed by a control input.
　図６は、スイッチ機能部１４の具体例を示す。同図の例では、スイッチ機能部１４は各相毎にサイリスタ１４ａとダイオード１４ｂとを有し、スイッチ機能部１４に入力される電圧に設定電圧以上の電圧が作用すると前記各相のサイリスタ１４ａをオフさせる過電圧時オフ指令手段１４ｃが設けられている。過電圧時オフ指令手段１４ｃは、前記スイッチ機能部１４に入力される電圧が設定電圧以下になると、サイリスタ１４ａをオンに復帰させる。オフさせる電圧とオンにさせる電圧には差を設けてヒステリシスを与え、設定電圧付近での頻繁なオンオフの繰替えしを回避するようにしてもよい。 FIG. 6 shows a specific example of the switch function unit 14. In the example of the figure, the switch function unit 14 has a thyristor 14a and a diode 14b for each phase, and when a voltage higher than a set voltage acts on the voltage input to the switch function unit 14, the thyristor 14a of each phase is activated. An over-voltage off command means 14c for turning off is provided. When the voltage input to the switch function unit 14 becomes equal to or lower than the set voltage, the overvoltage-time OFF command means 14c returns the thyristor 14a to ON. A hysteresis may be provided by providing a difference between the voltage to be turned off and the voltage to be turned on to avoid frequent on / off repetitions in the vicinity of the set voltage.
　同図の例は、整流器１５が前記過電圧時オフ指令手段１４ｃを有するようにしたが、前記過電圧時オフ指令手段１４ｃは、前記制御回路部５に設けられていてもよい。 In the example shown in the figure, the rectifier 15 has the off-voltage off command means 14c. However, the over-voltage off command means 14c may be provided in the control circuit unit 5.
　この構成によると、発電機３の負荷の調整により水車１の回転数を変える制御は、パワーコンディショナ８のＭＰＰＴ制御およびパワーコンディショナ８とは別に設けた前段の制御装置４で行い、制御装置４によりフェールセーフ制御、交流/直流変換制御を行う事で直流発電電力をパワーコンディショナ８に供給するようにしたため、汎用のパワーコンディショナ８を用いることが可能となる。このように、発電電力を系統９に連系する機器に、市販されている一体の汎用品のパワーコンディショナ８をそのまま改造することなく利用し、そのパワーコンディショナ８が有するＭＰＰＴ制御機能もそのまま利用し、水車１の回転数を制御するため、品質を確保しながら、専用設計の機器を用いる場合に比べて安価な水力発電システムを提供する事が可能となる。 According to this configuration, the control for changing the rotational speed of the water turbine 1 by adjusting the load of the generator 3 is performed by the MPPT control of the power conditioner 8 and the control device 4 provided separately from the power conditioner 8. Since the DC generated power is supplied to the power conditioner 8 by performing fail-safe control and AC / DC conversion control according to 4, the general-purpose power conditioner 8 can be used. In this way, the unitary power product 8 that is a commercially available integrated general-purpose product is used without modification in the device that connects the generated power to the grid 9, and the MPPT control function of the power conditioner 8 is also used as it is. Since it uses and controls the rotation speed of the water turbine 1, it is possible to provide an inexpensive hydroelectric power generation system as compared with the case of using a specially designed device while ensuring quality.
　また、この水力発電系統連系システムは、次の各利点が得られる。
　発電電力を整流する整流器１５にスイッチ機能部１４を有しているため、スイッチ機能部１４をオフとして発電機３と系統９とを切り離すことができて、水車１の高速回転や系統９の停電等により生じる過電圧電力への対応が容易となる。スイッチ機能部１４をオフとした場合、水車１の負荷が軽くなり、水車１の回転が速くなるが、電磁ブレーキ１０で水車１に制動力を与え、水車１の回転数を低下させて水車１を保護するようにしてもよい。 In addition, this hydropower system interconnection system has the following advantages.
Since the rectifier 15 that rectifies the generated power has the switch function unit 14, the switch function unit 14 can be turned off so that the generator 3 and the system 9 can be disconnected. It becomes easy to cope with overvoltage power generated by the above. When the switch function unit 14 is turned off, the load on the water wheel 1 is lightened and the water wheel 1 rotates faster. However, the electromagnetic brake 10 applies a braking force to the water wheel 1 to reduce the rotation speed of the water wheel 1. You may make it protect.
　以上、実施形態に基づいて本発明を実施するための形態を説明したが、ここで開示した実施の形態はすべての点で例示であって制限的なものではない。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 As mentioned above, although the form for implementing this invention based on embodiment was demonstrated, embodiment disclosed here is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
１…水車
２…水力発電装置
３…発電機
４…制御装置
８…パワーコンディショナ
９…系統
１０…電磁ブレーキ（制動手段）
１４…スイッチ機能部
１５…整流器
１７…電流計（電流検出手段）
１８…電圧計（電圧検出手段）
１９…回転数検出手段
２３…フェールセーフ制御手段 DESCRIPTION OF SYMBOLS 1 ... Turbine 2 ... Hydroelectric power generation device 3 ... Generator 4 ... Control device 8 ... Power conditioner 9 ... System 10 ... Electromagnetic brake (braking means)
14 ... switch function part 15 ... rectifier 17 ... ammeter (current detection means)
18 ... Voltmeter (voltage detection means)
19: Rotational speed detection means 23: Fail safe control means

Claims (7)

  1. 　水車と、水車の回転エネルギーを電気エネルギーに変換する発電機と、この発電機の発電電力を直流電力に変換する整流器と、この整流器で整流した直流電力を系統に連系可能な交流電力に変換するパワーコンディショナと、前記発電機の負荷を調整して前記水車の回転数を制御する制御装置とを備え、
    　前記パワーコンディショナが、一体の汎用品である、水力発電系統連系システム。     A turbine, a generator that converts the rotational energy of the turbine into electrical energy, a rectifier that converts the power generated by the generator into DC power, and the DC power rectified by the rectifier is converted into AC power that can be connected to the grid A power conditioner, and a control device for adjusting the load of the generator to control the rotational speed of the water wheel,
    A hydropower system interconnection system in which the power conditioner is an integrated general-purpose product.
  2. 　請求項１に記載の水力発電系統連系システムにおいて、前記パワーコンディショナが、太陽光発電の発電電力の系統への連系向けの汎用品である水力発電系統連系システム。 The hydropower system interconnection system according to claim 1, wherein the power conditioner is a general-purpose product for connection to a power generation system of photovoltaic power generation.
  3. 　請求項１または請求項２に記載の水力発電系統連系システムにおいて、前記整流器が、整流を行う整流機能部と、前記発電機の発電電力の前記整流機能部への入力をオンオフするスイッチ機能部とを有する水力発電系統連系システム。 3. The hydropower system interconnection system according to claim 1, wherein the rectifier includes a rectification function unit that performs rectification, and a switch function unit that turns on / off input of the generated power of the generator to the rectification function unit. And a hydropower system interconnection system.
  4. 　請求項１ないし請求項３のいずれか１項に記載の水力発電系統連系システムにおいて、前記発電機と前記パワーコンディショナとの間に接続され過電圧電力を抵抗によって吸収する消費抵抗装置と、前記発電機の発電電力が設定電圧以上の過電圧になった時に前記発電機の発電電力に発生する過電圧電力を前記消費抵抗装置に吸収させる消費抵抗制御手段とを備える水力発電系統連系システム。 The hydroelectric power system interconnection system according to any one of claims 1 to 3, wherein the consumption resistance device is connected between the generator and the power conditioner and absorbs overvoltage power by resistance, and A hydroelectric power grid interconnection system comprising consumption resistance control means for causing the consumption resistance device to absorb the overvoltage power generated in the generated power of the generator when the generated power of the generator becomes an overvoltage that is equal to or higher than a set voltage.
  5. 　請求項３に記載の水力発電系統連系システムにおいて、前記制御装置は、前記整流機能部がオフであるときに発電電力を抵抗によって消費させる手段を有しない水力発電系統連系システム。 4. The hydropower grid interconnection system according to claim 3, wherein the control device does not have means for consuming generated power by resistance when the rectification function unit is off.
  6. 　請求項１ないし請求項４のいずれか１項に記載の水力発電系統連系システムにおいて、
    　前記発電機の前記整流器で整流された電圧を計測する電圧検出手段と、
    　前記発電機の前記整流器で整流された電流を計測する電流検出手段と、
    　前記電流検出手段で検出した電流を演算する電流演算手段と、
    　前記発電機の発電電力の周波数から前記発電機の回転数を検出する回転数検出手段と、
    　前記電圧検出手段、前記電流検出手段、および前記回転数検出手段が検出した電圧、電流、および回転数、並びに前記パワーコンディショナが出力する起動、停止、および異常信号から、定められた保護作動条件を充足する場合に、前記発電機の前記整流器への入力遮断および前記発電機に備えられた制動手段の制動のいずれか一方または両方を行わせるフェールセーフ制御手段とを有する、
    　水力発電系統連系システム。     In the hydropower system interconnection system according to any one of claims 1 to 4,
    Voltage detection means for measuring the voltage rectified by the rectifier of the generator;
    Current detection means for measuring the current rectified by the rectifier of the generator;
    Current calculating means for calculating the current detected by the current detecting means;
    Rotational speed detection means for detecting the rotational speed of the generator from the frequency of the generated power of the generator;
    Protective operation conditions determined from the voltage, current, and rotation speed detected by the voltage detection means, the current detection means, and the rotation speed detection means, and the start, stop, and abnormal signals output by the power conditioner And fail safe control means for performing either one or both of shutting off the input to the rectifier of the generator and braking of the braking means provided in the generator when satisfying
    Hydroelectric power system interconnection system.
  7. 　請求項５に記載の水力発電系統連系システムにおいて、
    　前記発電機の前記整流器で整流された電圧を計測する電圧検出手段と、
    　前記発電機の前記整流器で整流された電流を計測する電流検出手段と、
    　前記電流検出手段で検出した電流を演算する電流演算手段と、
    　前記発電機の発電電力の周波数から前記発電機の回転数を検出する回転数検出手段と、
    　前記電圧検出手段、前記電流検出手段、および前記回転数検出手段が検出した電圧、電流、および回転数、並びに前記パワーコンディショナが出力する起動、停止、および異常信号から、定められた保護作動条件を充足する場合に、前記発電機の前記整流器の前記スイッチ機能部へのオフの指令および前記発電機に備えられた制動手段の制動のいずれか一方または両方を行わせるフェールセーフ制御手段とを有する、
    　水力発電系統連系システム。     In the hydropower system interconnection system according to claim 5,
    Voltage detection means for measuring the voltage rectified by the rectifier of the generator;
    Current detection means for measuring the current rectified by the rectifier of the generator;
    Current calculating means for calculating the current detected by the current detecting means;
    Rotational speed detection means for detecting the rotational speed of the generator from the frequency of the generated power of the generator;
    Protective operation conditions determined from the voltage, current, and rotation speed detected by the voltage detection means, the current detection means, and the rotation speed detection means, and the start, stop, and abnormal signals output by the power conditioner And fail-safe control means for performing either or both of a command to turn off the switch function unit of the rectifier of the generator and braking of a braking means provided in the generator when satisfying ,
    Hydroelectric power system interconnection system.
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