JP2003134661A - Load interruption detecting device and photovoltaic power generator - Google Patents

Load interruption detecting device and photovoltaic power generator

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Publication number
JP2003134661A
JP2003134661A JP2001319571A JP2001319571A JP2003134661A JP 2003134661 A JP2003134661 A JP 2003134661A JP 2001319571 A JP2001319571 A JP 2001319571A JP 2001319571 A JP2001319571 A JP 2001319571A JP 2003134661 A JP2003134661 A JP 2003134661A
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current
output voltage
deviation
load shedding
inverter
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Hiroyuki Otake
Koji Toyama
浩司 外山
宏之 大嶽
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Mitsubishi Heavy Ind Ltd
三菱重工業株式会社
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Priority to JP2001319571A priority Critical patent/JP2003134661A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

PROBLEM TO BE SOLVED: To provide a load interruption detecting device for photovoltaic power generator in which voltage rise can be minimized even if a load interruption occurs. SOLUTION: A load interruption detecting system in a photovoltaic power generator performing linkage operation with a power system comprises means for detecting the instantaneous output voltage from the photovoltaic power generator, and means for detecting deviation of a current of the photovoltaic power generator from a command value, wherein occurrence of load interruption of the photovoltaic power generator is determined when the instantaneous value of the output voltage exceeds a predetermined value and/or the deviation of the electric current from the command for exceeds a predetermined value, and when a state of load interruption takes place, an inverter is suspended by a gate blocking means.

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】この発明は、電力系統と連系運転を行う太陽光発電装置における負荷遮断を検出する技術に関する。 BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates to a technique for detecting a load shedding in photovoltaic device that performs power system and interconnected operation. 【0002】 【従来の技術】太陽電池による太陽光発電は、他の自然エネルギー利用の発電方式と異なり、建築物の屋根や壁面に容易に設置することができ、騒音その他の公害の心配もないため、無公害発電システムとして期待されるようになってきている。 [0002] The solar power generation according to the prior art solar cell is different from the power generation system of other natural energy use, on the roof or wall of a building can be easily installed, there is no worry of noise and other pollution because, have come to be expected as a pollution-free power generation system. 近年、電力系統と連系運転を行うことが可能となり、一般家庭で太陽光発電を行うときは系統連系用インバータによって商用交流電源と系統連系を行うのが一般的になっている。 Recently, it is possible to perform the power system and the communication system operation, when performing photovoltaic power generation in ordinary households perform commercial AC power source and the system interconnection is in general by the system interconnection inverter. 【0003】太陽光発電装置が電力系統と連系運転を行っているとき、分電盤やその他の場所で突然断線状態となり太陽光発電装置が無負荷となる、いわゆる負荷遮断の状態が起こることがある。 [0003] When the solar power generation device is performing power system and the communication system operation, the distribution board or other photovoltaic device becomes suddenly disconnected state where is unloaded, the state of so-called load rejection occurs there is. 負荷遮断が起こると、今まで流れていた電流が突然ゼロになるため、太陽光発電装置の出力電圧が異常上昇してしまい、装置に悪影響を与える虞があるので、これを回避するため、連系点の電流を監視したり、電圧上昇を検出して異常を検出し、ゲートブロックによってインバータを停止する方法が実用化されている。 When load rejection occurs, since the current flowing ever becomes suddenly zero, the output voltage of the photovoltaic device will be abnormally increased, since there is a concern that an adverse effect on device, in order to avoid this, communicating to monitor the current of the system point to detect an abnormality by detecting a voltage rise, how to stop the inverter has been put into practical use by the gate block. 【0004】 【発明が解決しようとする課題】ところが上述の方法では、連系点の電流を監視するための検出手段が必要となり、装置の小型化、低コスト化の妨げになってしまうという課題があった。 [0004] The present invention is to provide a hand in the manner described above, a problem that the detection means for monitoring the current in the interconnection point is required, miniaturization of the apparatus, thus hindering cost reduction was there. また、電圧上昇を検出する方法では、検出遅れによって電圧上昇値が大きくなるため、内部部品の耐電圧値を大きくする必要があり、装置のコストアップとなってしまうという課題があった。 In the method of detecting a voltage increase, the voltage rise value by detection delay increases, it is necessary to increase the withstand voltage value of the internal parts, there is a problem that a cost of the apparatus. 【0005】本発明はこのような背景の下になされたもので、負荷遮断が発生しても電圧上昇を最小限に抑えることができる負荷遮断検出装置、およびそれを備える太陽光発電装置を提供することを目的とする。 [0005] The present invention has been made under these circumstances, the load shedding detection device load shedding can be minimized voltage rise occurs, and provides a photovoltaic device having the same an object of the present invention is to. 【0006】 【課題を解決するための手段】請求項1に記載の発明は、電力系統と連系運転を行う太陽光発電装置における負荷遮断検出装置であって、太陽光発電装置の出力電圧の瞬時値を検出する出力電圧瞬時値検出手段と、前記太陽光発電装置の電流の指令値に対する偏差を検出する電流偏差検出手段とを具備することを特徴とする太陽光発電装置の負荷遮断検出装置を提供する。 [0006] [Summary of the invention according to claim 1 is a load rejection detection device in the photovoltaic power generation apparatus that performs power system and the communication system operation, the output voltage of the solar generator an output voltage instantaneous value detection means for detecting an instantaneous value, load rejection detector photovoltaic device characterized by comprising a current deviation detecting means for detecting a deviation with respect to the command value of the current of the photovoltaic device I will provide a. 【0007】この発明によれば、太陽光発電装置の出力電圧の瞬時値を監視し、定格電圧に対して所定の比率以上に上昇したとき異常を検出する手段と、電流の指令値に対する実際の電流の偏差が所定以上の大きさになったとき異常を検出する手段とを備えて負荷遮断の検出を行うので、どのようなタイミングで負荷遮断が発生しても高速で検出を行うことができる。 [0007] According to the present invention, to monitor the instantaneous value of the output voltage of the solar power generation apparatus, comprising: means for detecting an abnormality when raised above a predetermined ratio to the rated voltage, the actual with respect to the command value of the current since the deviation of the current to detect the load shedding and means for detecting an abnormality when it becomes a predetermined size or more, load shedding at any timing can be detected at high speed even in the event . 【0008】請求項2に記載の発明は、請求項1記載の負荷遮断検出装置において、前記出力電圧の瞬時値が所定のレベルを超えるか、または前記電流の指令値に対する偏差が所定のレベルを超えたとき、前記太陽光発電装置の負荷遮断と認定することを特徴とする。 [0008] According to a second aspect of the invention, the load shedding detection device according to claim 1, or the instantaneous value of the output voltage exceeds a predetermined level, or the level deviation is predetermined with respect to the command value of the current when exceeding, characterized in that it recognized as load shedding of the photovoltaic device. 【0009】この発明によれば、出力電圧の瞬時値が所定のレベルを超えたとき、および、電流の指令値とインバータ出力電流との偏差を検出し、この偏差が所定値を超えたときのどちらの場合も負荷遮断と認定して装置保護を行うので、出力電圧のピークをある値以下に抑えることができ、安全性を高めることができる。 According to the present invention, when the instantaneous value of the output voltage exceeds a predetermined level, and detects the deviation between the command value of current and the inverter output current, when this deviation exceeds a predetermined value since both cases performing device protected by certified load shedding, can be suppressed to below a certain value peak of the output voltage, it is possible to improve safety. 【0010】請求項3に記載の発明は、請求項1記載の負荷遮断検出装置において、前記出力電圧の瞬時値が所定のレベルを超え、且つ、前記電流の指令値に対する偏差が所定のレベルを超えたとき、前記太陽光発電装置の負荷遮断と認定することを特徴とする。 [0010] The invention described in claim 3 is the load rejection detection device according to claim 1, above the level instantaneous value of the predetermined said output voltage, and the level deviation is predetermined with respect to the command value of the current when exceeding, characterized in that it recognized as load shedding of the photovoltaic device. 【0011】この発明によれば、出力電圧の瞬時値が所定レベルを超え、且つ、電流の指令値とインバータ出力電流との検出偏差が所定値を超えたとき、負荷遮断と認定して装置保護を行うので、信頼性を高めることができる。 According to the present invention, the instantaneous value of the output voltage exceeds a predetermined level, and, when the detected deviation between the command value of the current and the inverter output current exceeds a predetermined value, device protection and certified as load shedding since the, reliability can be improved. 【0012】請求項4に記載の発明は、請求項1記載の負荷遮断検出装置において、前記出力電圧の瞬時値が所定のレベルを超え、且つ、前記電流の指令値がゼロでないにもかかわらず流れる電流がゼロであったとき、前記太陽光発電装置の負荷遮断と認定する検出手段を具備することを特徴とする。 [0012] According to a fourth aspect of the invention, the load shedding detection device according to claim 1, the instantaneous value of the output voltage exceeds a predetermined level, and, even though the command value of the current is not zero when the current flowing is zero, characterized by including a detection means for certified load shedding of the photovoltaic device. 【0013】この発明によれば、出力電圧の瞬時値が所定レベルを超え、且つ、電流の指令値がゼロでないにもかかわらず流れる電流がゼロであったとき、負荷遮断と認定して装置保護を行うので、信頼性を高めることができる。 According to the present invention, the instantaneous value of the output voltage exceeds a predetermined level, and, when the command value of the current is the current flowing even though non-zero was zero, device protection and certified as load shedding since the, reliability can be improved. 【0014】請求項5に記載の発明は、請求項1から4 [0014] The invention according to claim 5, claim 1 4
のいずれか記載の負荷遮断検出装置と、太陽電池出力を交流電力に逆変換するインバータのゲート制御信号を遮断するゲートブロック手段とを具備し、前記負荷遮断と認定される状態が起こったとき、前記ゲートブロック手段によって前記インバータを停止することを特徴とする太陽光発電装置を提供する。 A load rejection detection apparatus according any one of to and a gate block means for blocking the gate control signal of the inverter to be converted back to AC power of the solar cell output, when the state to be recognized as the load shedding occurs, providing photovoltaic apparatus characterized by stopping the inverter by the gate block means. 【0015】この発明によれば、インバータのゲート制御信号を遮断するゲートブロック手段を具備して負荷遮断と認定される状態が起こったとき、ゲートブロックによってインバータを停止させるので、安全でかつ信頼性の高い太陽光発電を実施することができる。 According to the present invention, when the conditions comprises a gate block means for blocking the gate control signal of the inverter is identified as load shedding has occurred, since stopping the inverter by the gate block, safe and reliable it can be carried out with a high solar power. 【0016】 【発明の実施の形態】以下、この発明の実施の形態について図を参照しながら説明する。 DETAILED DESCRIPTION OF THE INVENTION Hereinafter, will be described with reference to the drawings embodiments of the present invention. 【0017】<第1の実施の形態>図1は、この発明の第1の実施の形態による太陽光発電装置の構成を示すブロック図である。 [0017] Figure 1 <First Embodiment> is a block diagram showing the structure of a photovoltaic device according to a first embodiment of the present invention. この図において、符号1は太陽電池出力であり、太陽電池パネル、接続箱および昇圧チョッパ等を含み、直流電力を出力する。 In this figure, reference numeral 1 is a photovoltaic output, solar panel comprises a connection box and the boost chopper or the like, and outputs the DC power. インバータ2は、太陽電池出力1の直流電力を交流電力に逆変換した後、正弦化フィルタ4によって波形歪を除去し、負荷6の接続された電力系統5と連系運転を行う。 The inverter 2, after inverse converts DC power of the solar cell output 1 into AC power, the waveform distortion is removed by a sine filter 4 performs the connected power system 5 and interconnected operation of the load 6. 【0018】インバータ2は、電力系統5と連系を行うために出力電流を制御する必要があり、電流指令値生成手段12の出力する信号と電流センサ3の電流信号とを電流偏差検出手段13において比較し、偏差がゼロになるようにインバータゲート制御手段14においてゲート制御信号を生成し、インバータ2を駆動する。 The inverter 2, it is necessary to control the output current in order to perform the power system 5 and the communication system, the current and the current signal of the signal and the current sensor 3 for outputting a current command value generating means 12 the deviation detecting means 13 compared in, generates a gate control signal at the inverter gate control means 14 so that the deviation becomes zero, to drive the inverter 2. このような構成による太陽光発電装置が連系点付近で電力系統5 Power system 5 such photovoltaic devices according to configuration around the interconnection points
との連系が突然絶たれ無負荷となる、いわゆる負荷遮断が発生すると、今まで流れていた電流が突然ゼロになるため、太陽光発電装置の出力電圧が異常上昇してしまい、装置に悪影響を与える虞があり、速やかにインバータ2を停止する必要がある。 Interconnection is suddenly cut off is unloaded and, when so-called load rejection occurs, the current flowing ever becomes suddenly zero, the output voltage of the photovoltaic device will be abnormally increased, adverse effect on the device There is a possibility to give, it is necessary to quickly stop the inverter 2. 【0019】このため、出力電圧瞬時値検出手段11によって連系点の電圧の瞬時値を常時監視しており、電圧の瞬時値が定格電圧のピーク値の120%を超える状態が起こると、直ちにゲートブロック手段15に信号を送出してインバータゲート制御手段14から出力されているゲート制御信号をブロックしてインバータ2を停止させる。 [0019] Therefore, always monitors the instantaneous value of the voltage of the connecting point by the output voltage instantaneous value detection unit 11, when the state in which the instantaneous value of the voltage exceeds 120% of the peak value of the rated voltage occurs, immediately sends a signal to the gate block means 15 blocks the gate control signal output from the inverter gate control means 14 to stop the inverter 2. 【0020】さらに、電流偏差検出手段13において電流指令値生成手段12の電流指令値と電流センサ3の電流信号との偏差を検出し、この偏差が小さくなるようにインバータゲート制御手段14おいてゲート信号を出力してインバータ2を駆動しているが、負荷遮断が発生すると前記偏差が大きくなるので、このときゲートブロック手段15に信号を送出してインバータゲート制御手段14から出力されているゲート制御信号をブロックしてインバータ2を停止させる。 Furthermore, current deviation detection means 13 detects the deviation between the current signal of the current command value and the current sensor 3 of the current command value generating means 12 in the inverter gate control means 14 Oite gate as the deviation decreases Although outputs a signal driving the inverter 2, so the difference between load shedding occurs is increased, the gate control which is output from the inverter gate control means 14 sends out a signal to the gate block means 15 at this time blocking a signal to stop the inverter 2. 【0021】この実施の形態では、出力電圧が上昇した場合、および指令値との電流偏差が大きくなった場合のどちらでもインバータを停止するので、出力電圧のピーク値を150%以下に抑えることができ、きわめて安全度の高い保護方式とすることができる。 [0021] In this embodiment, when the output voltage rises, and the current deviation between a command value to stop the inverter either if increased, it is possible to suppress the peak value of the output voltage below 150% can be, it can be a high protection system extremely safe level. 【0022】<第2の実施の形態>図2は、この発明の第2の実施の形態による太陽光発電装置の構成を示すブロック図である。 [0022] Figure 2 <Second Embodiment> is a block diagram showing the structure of a photovoltaic device according to a second embodiment of the present invention. この図において、符号1は太陽電池出力であり、太陽電池パネル、接続箱および昇圧チョッパ等を含み、直流電力を出力する。 In this figure, reference numeral 1 is a photovoltaic output, solar panel comprises a connection box and the boost chopper or the like, and outputs the DC power. インバータ2は、太陽電池出力1の直流電力を交流電力に逆変換した後、正弦化フィルタ4によって波形歪を除去し、負荷6の接続された電力系統5と連系運転を行う。 The inverter 2, after inverse converts DC power of the solar cell output 1 into AC power, the waveform distortion is removed by a sine filter 4 performs the connected power system 5 and interconnected operation of the load 6. 【0023】インバータ2は、電力系統5と連系を行うために出力電流を制御する必要があり、電流指令値生成手段12の出力する信号と電流センサ3の電流信号とを電流偏差検出手段13において比較し、偏差がゼロになるようにインバータゲート制御手段14においてゲート制御信号を生成し、インバータ2を駆動する。 The inverter 2, it is necessary to control the output current in order to perform the power system 5 and the communication system, the current and the current signal of the signal and the current sensor 3 for outputting a current command value generating means 12 the deviation detecting means 13 compared in, generates a gate control signal at the inverter gate control means 14 so that the deviation becomes zero, to drive the inverter 2. このような構成による太陽光発電装置が連系点付近で電力系統5 Power system 5 such photovoltaic devices according to configuration around the interconnection points
との連系が突然絶たれ無負荷となる、いわゆる負荷遮断が発生すると、今まで流れていた電流が突然ゼロになるため、太陽光発電装置の出力電圧が異常上昇してしまい、装置に悪影響を与える虞があり、速やかにインバータ2を停止する必要がある。 Interconnection is suddenly cut off is unloaded and, when so-called load rejection occurs, the current flowing ever becomes suddenly zero, the output voltage of the photovoltaic device will be abnormally increased, adverse effect on the device There is a possibility to give, it is necessary to quickly stop the inverter 2. 【0024】このため、出力電圧瞬時値検出手段11によって連系点の電圧の瞬時値を常時監視しており、電圧の瞬時値が定格電圧のピーク値の120%を超える状態が起こると、直ちに論理積回路16に信号を送出する。 [0024] Therefore, always monitors the instantaneous value of the voltage of the connecting point by the output voltage instantaneous value detection unit 11, when the state in which the instantaneous value of the voltage exceeds 120% of the peak value of the rated voltage occurs, immediately and it sends a signal to the aND circuit 16.
さらに、電流偏差検出手段13において電流指令値生成手段12の電流指令値と電流センサ3の電流信号との偏差を検出し、この偏差が小さくなるようにインバータゲート制御手段14おいてゲート信号を出力してインバータ2を駆動しているが、負荷遮断が発生すると前記偏差が大きくなるので、このとき論理積回路16に信号を送出する。 Furthermore, to detect the deviation between the current signal of the current command value and the current sensor 3 of the current command value generating means 12 in the current deviation detection means 13, the output inverter gate control means 14 Oite gate signal so that this deviation becomes smaller While driving the inverter 2 and, since the difference between load shedding occurs is increased, and sends a signal to the aND circuit 16 at this time. 【0025】出力電圧瞬時値検出手段11の信号、および電流偏差検出手段13からの偏差値大の信号の両方の信号が論理積回路16に与えられたとき、ゲートブロック手段15に信号を送出してインバータゲート制御手段14から出力されているゲート制御信号をブロックしてインバータ2を停止させる。 [0025] When the signal of the output voltage instantaneous value detection unit 11, and both the signal deviation value sized signals from current deviation detector 13 is given to the AND circuit 16 sends a signal to the gate block means 15 blocking the gate control signal output from the inverter gate control means 14 stops the inverter 2 Te. この実施の形態では、出力電圧が上昇し、且つ、電流指令値との電流偏差が大きくなった場合にインバータを停止するのできわめて信頼度の高い保護方式とすることができる。 In this embodiment, the output voltage increases, and may be a high protection scheme very reliable because stopping the inverter if the current deviation between the current command value is increased. 【0026】<第3の実施の形態>図2は、この発明の第3の実施の形態による太陽光発電装置の構成を示すブロック図であり、上述の第2の実施の形態と同一の構成である。 [0026] <Third Embodiment> FIG. 2 is a block diagram showing the structure of a photovoltaic device according to a third embodiment of the present invention, the same configuration as the second embodiment described above it is. 図2のような構成による太陽光発電装置が連系点付近で電力系統5との連系が突然絶たれ無負荷となる、いわゆる負荷遮断が発生すると、今まで流れていた電流が突然ゼロになるため、太陽光発電装置の出力電圧が異常上昇してしまい、装置に悪影響を与える虞があり、速やかにインバータ2を停止する必要がある。 Configuration photovoltaic device according to as shown in FIG. 2 is interconnection suddenly cut off is unloaded with the power system 5 in the vicinity of the interconnection point, the so-called load shedding occurs, current suddenly to zero which has been flowing ever made, the output voltage of the photovoltaic device will be abnormally increased, there is a concern that an adverse effect on device, it is necessary to quickly stop the inverter 2. 【0027】このため、出力電圧瞬時値検出手段11によって連系点の電圧の瞬時値を常時監視しており、電圧の瞬時値が定格電圧のピーク値の120%を超える状態が起こると、直ちに論理積回路16に信号を送出する。 [0027] Therefore, always monitors the instantaneous value of the voltage of the connecting point by the output voltage instantaneous value detection unit 11, when the state in which the instantaneous value of the voltage exceeds 120% of the peak value of the rated voltage occurs, immediately and it sends a signal to the aND circuit 16.
さらに、電流偏差検出手段13において電流指令値生成手段12の電流指令値と電流センサ3の電流信号との偏差を検出し、この偏差が小さくなるようにインバータゲート制御手段14おいてゲート信号を出力してインバータ2を駆動しているが、電流指令値がゼロでないのに電流センサ3の信号がゼロになったとき負荷遮断と判断して論理積回路16に信号を送出する。 Furthermore, to detect the deviation between the current signal of the current command value and the current sensor 3 of the current command value generating means 12 in the current deviation detection means 13, the output inverter gate control means 14 Oite gate signal so that this deviation becomes smaller While driving the inverter 2 and sends a signal to the aND circuit 16 determines that the load shedding when the current command value signal of the current sensor 3 to a non-zero is zero. 【0028】出力電圧瞬時値検出手段11の信号、および電流偏差検出手段13からの偏差値大の信号の両方の信号が論理積回路16に与えられたとき、ゲートブロック手段15に信号を送出してインバータゲート制御手段14から出力されているゲート制御信号をブロックしてインバータ2を停止させる。 [0028] When the signal of the output voltage instantaneous value detection unit 11, and both the signal deviation value sized signals from current deviation detector 13 is given to the AND circuit 16 sends a signal to the gate block means 15 blocking the gate control signal output from the inverter gate control means 14 stops the inverter 2 Te. この実施の形態では、出力電圧が上昇し、且つ、電流指令値がゼロでないのに実際の電流値がゼロであった場合にインバータを停止するので、きわめて信頼度の高い保護方式とすることができる。 In this embodiment, the output voltage is increased, and, since the current command value is the actual current value to a non-zero to stop the inverter when was zero, be a very reliable protection scheme it can. 【0029】以上、本発明の実施の形態の動作を図面を参照して詳述してきたが、本発明はこの実施の形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計変更等があっても本発明に含まれる。 [0029] Although the operation of the embodiment of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to this embodiment, design changes without departing from the scope of the present invention even if there is an equal included in the present invention. 【0030】 【発明の効果】これまでに説明したように、本発明によれば以下に示す効果が得られる。 [0030] As described, according to the present invention so far, according to the present invention the following effects are obtained. 請求項1の発明によれば、太陽光発電装置の出力電圧の瞬時値を監視し、定格電圧に対して所定の比率以上に上昇したとき異常を検出する手段と、電流の指令値に対する実際の電流の偏差が所定以上の大きさになったとき異常を検出する手段とを備えて負荷遮断の検出を行うので、どのようなタイミングで負荷遮断が発生しても高速で検出を行うことができる。 According to the present invention, to monitor the instantaneous value of the output voltage of the solar power generation apparatus, comprising: means for detecting an abnormality when raised above a predetermined ratio to the rated voltage, the actual with respect to the command value of the current since the deviation of the current to detect the load shedding and means for detecting an abnormality when it becomes a predetermined size or more, load shedding at any timing can be detected at high speed even in the event . 【0031】請求項2の発明によれば、出力電圧の瞬時値が所定レベルを超えたとき、および、電流の指令値とインバータ出力電流との偏差を検出し、この偏差が所定値を超えたときのどちらの場合も負荷遮断と認定して装置保護を行うので、出力電圧のピークをある値以下に抑えることができ、安全性を高めることができる。 According to the invention of claim 2, when the instantaneous value of the output voltage exceeds a predetermined level, and detects the deviation between the command value of current and the inverter output current, the deviation exceeds a predetermined value since also perform device protected by certified load shedding for either case, can be suppressed to below a certain value peak of the output voltage, it is possible to improve safety. 【0032】請求項3の発明によれば、出力電圧の瞬時値が所定レベルを超え、且つ、電流の指令値とインバータ出力電流との検出偏差が所定値を超えたとき、負荷遮断と認定して装置保護を行うので、信頼性を高めることができる。 According to the invention of claim 3, the instantaneous value exceeds the predetermined level of the output voltage, and, when the detected deviation between the command value of the current and the inverter output current exceeds a predetermined value, finding that load shedding since the device protection Te, it is possible to improve the reliability. 【0033】請求項4の発明によれば、出力電圧の瞬時値が所定レベルを超え、且つ、電流の指令値がゼロでないにもかかわらず流れる電流がゼロであったとき、負荷遮断と認定して装置保護を行うので、信頼性を高めることができる。 According to the invention of claim 4, the instantaneous value of the output voltage exceeds a predetermined level, and, when the command value of the current is the current flowing even though non-zero was zero, finding that load shedding since the device protection Te, it is possible to improve the reliability. 【0034】請求項5の発明によれば、インバータのゲート制御信号を遮断するゲートブロック手段を具備して負荷遮断と認定される状態が起こったとき、ゲートブロックによってインバータを停止させるので、安全でかつ信頼性の高い太陽光発電を実施することができる。 According to the invention of claim 5, when the conditions comprises a gate block means for blocking the gate control signal of the inverter is identified as load shedding has occurred, since stopping the inverter by the gate block, safe and it can be carried out highly reliable solar power.

【図面の簡単な説明】 【図1】 本発明の第1の実施の形態による太陽光発電装置の構成を示すブロック図。 Block diagram showing the structure of a photovoltaic device according to a first embodiment of BRIEF DESCRIPTION OF THE DRAWINGS [Figure 1] present invention. 【図2】 本発明の第2または第3の実施の形態による太陽光発電装置の構成を示すブロック図。 Block diagram showing the structure of a photovoltaic device according to the second or third embodiment of the present invention; FIG. 【符号の説明】 1…太陽電池出力2…インバータ3…電流センサ4…正弦化フィルタ5…電力系統6…負荷11…出力電圧瞬時値検出手段12…電流指令値生成手段13…電流偏差検出手段14…インバータゲート制御手段15…ゲートブロック手段16…論理積回路 [Description of Reference Numerals] 1 ... solar cell output 2 ... inverter 3 ... current sensor 4 ... sine filter 5 ... power system 6 ... load 11 ... output voltage instantaneous value detection means 12 ... current command value generating means 13 ... current deviation detection means 14 ... inverter gate control means 15 ... gate block means 16 ... AND circuit

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Claims (1)

  1. 【特許請求の範囲】 【請求項1】 電力系統と連系運転を行う太陽光発電装置における負荷遮断検出装置であって、 太陽光発電装置の出力電圧の瞬時値を検出する出力電圧瞬時値検出手段と、 前記太陽光発電装置の電流の指令値に対する偏差を検出する電流偏差検出手段とを具備することを特徴とする負荷遮断検出装置。 Patent Claims: 1. A load rejection detection device in the photovoltaic power generation apparatus that performs power system and the communication system operation, the detection output voltage instantaneous value detected instantaneous value of the output voltage of the solar generator means and, load shedding detecting apparatus characterized by comprising a current deviation detecting means for detecting a deviation with respect to the command value of the current of the photovoltaic device. 【請求項2】 前記出力電圧の瞬時値が所定のレベルを超えるか、または前記電流の指令値に対する偏差が所定のレベルを超えたとき、前記太陽光発電装置の負荷遮断と認定することを特徴とする請求項1記載の負荷遮断検出装置。 Wherein one instantaneous value of said output voltage exceeds a predetermined level, or when the deviation from the command value of the current exceeds a predetermined level, characterized in that certified the load shedding of the photovoltaic device load shedding detecting apparatus according to claim 1,. 【請求項3】 前記出力電圧の瞬時値が所定のレベルを超え、且つ、前記電流の指令値に対する偏差が所定のレベルを超えたとき、前記太陽光発電装置の負荷遮断と認定することを特徴とする請求項1記載の負荷遮断検出装置。 Wherein above the level instantaneous value of the predetermined said output voltage and, when the deviation from the command value of the current exceeds a predetermined level, characterized in that certified the load shedding of the photovoltaic device load shedding detecting apparatus according to claim 1,. 【請求項4】 前記出力電圧の瞬時値が所定のレベルを超え、且つ、前記電流の指令値がゼロでないにもかかわらず流れる電流がゼロであったとき、前記太陽光発電装置の負荷遮断と認定する検出手段を具備することを特徴とする請求項1記載の負荷遮断検出装置。 Instantaneous value of wherein said output voltage exceeds a predetermined level, and, when the command value of the current is the current flowing even though non-zero was zero, and load rejection of the photovoltaic device load shedding detecting apparatus according to claim 1, characterized by comprising a detecting means certified for. 【請求項5】 請求項1から4のいずれか記載の負荷遮断検出装置と、太陽電池出力を交流電力に逆変換するインバータのゲート制御信号を遮断するゲートブロック手段とを具備し、 前記負荷遮断と認定される状態が起こったとき、前記ゲートブロック手段によって前記インバータを停止することを特徴とする太陽光発電装置。 5. A comprising the claims 1 to load dump detection device according to any one of 4, and a gate block means for blocking the gate control signal of the inverter to be converted back to AC power of the solar cell output, the load shedding when the condition being certified has occurred and, photovoltaic device, characterized by stopping the inverter by the gate block means.
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