JP4940978B2 - Overvoltage protection device for DC parallel power supply - Google Patents

Overvoltage protection device for DC parallel power supply Download PDF

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JP4940978B2
JP4940978B2 JP2007027722A JP2007027722A JP4940978B2 JP 4940978 B2 JP4940978 B2 JP 4940978B2 JP 2007027722 A JP2007027722 A JP 2007027722A JP 2007027722 A JP2007027722 A JP 2007027722A JP 4940978 B2 JP4940978 B2 JP 4940978B2
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JP2008193853A (en
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栄雄 星野
淳一 中野
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富士電機株式会社
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この発明は、複数の直流電源装置から並列に共通の負荷に直流母線を介して給電するようにした直流並列給電装置において、負荷を過電圧から保護するための過電圧保護装置に関する。   The present invention relates to an overvoltage protection device for protecting a load from an overvoltage in a DC parallel power supply device that supplies power to a common load in parallel from a plurality of DC power supply devices via a DC bus.
複数の直流電源から共通の負荷に並列に給電する直流並列給電装置としては、従来から特許文献1に示されるような装置が知られている。   As a DC parallel power supply device that supplies power to a common load in parallel from a plurality of DC power supplies, a device as shown in Patent Document 1 has been known.
この特許文献1に示された給電装置の構成を図3に示す。   FIG. 3 shows the configuration of the power supply apparatus disclosed in Patent Document 1.
図3において、10は共通の直流母線、11、12はこの母線接続された負荷である。
直流母線10には、2つの直流電源20および40から直流電力が並列に給電される。
直流電源20および40は、それぞれ交流電源21および41と交流電力を直流電力に変換する電力変換器22および42とで構成されている。
3, 10 is a common DC bus, 11 and 12 is a load connected to the bus.
DC power is supplied in parallel to the DC bus 10 from the two DC power supplies 20 and 40.
DC power supplies 20 and 40 are configured by AC power supplies 21 and 41 and power converters 22 and 42 for converting AC power into DC power, respectively.
電力変換器22と42は、共通の負荷11〜1nの接続される直流母線10に並列に接続され、この母線10を介して負荷に直流電力を供給する。   The power converters 22 and 42 are connected in parallel to the DC bus 10 to which the common loads 11 to 1n are connected, and supply DC power to the load via the bus 10.
電力変換器22および42からそれぞれ負荷11および12に供給する電力は等しいことが望ましい。そのためには、各電力変換器22と42との出力電圧を同じ値にすることが必要となる。   The power supplied from the power converters 22 and 42 to the loads 11 and 12 is preferably equal. For that purpose, it is necessary to make the output voltage of each power converter 22 and 42 the same value.
そこで、各電力変換器に制御装置30および50を設け、それぞれ、電圧検出器34および54により電力変換器22および42の出力電圧を検出し、加算器33および53で求められる電圧設定器32および52に設定した電圧設定値と電圧検出値との偏差を電圧調節器31および51に与え、この偏差を零にする制御信号をこれらの電圧調節器31および51から取り出す。この制御信号をパルス発生器35および55を経て電力変換器22および42に与えることにより出力電圧を電圧設定器に設定された電圧設定値に維持することができる。したがって、電圧設定器32と52とに同じ設定値を設定することにより両電力変換器の負荷電流を同じにすることが可能となるが、実際には両設定器の設定誤差や、変換器自身および制御装置の特性の僅かな差に起因して負荷電流をバランスさせることが困難である。   Therefore, the control devices 30 and 50 are provided in each power converter, and the voltage detectors 34 and 54 detect the output voltages of the power converters 22 and 42, respectively. A deviation between the voltage set value set to 52 and the detected voltage value is given to the voltage regulators 31 and 51, and a control signal for making this deviation zero is taken out from these voltage regulators 31 and 51. By supplying this control signal to power converters 22 and 42 via pulse generators 35 and 55, the output voltage can be maintained at the voltage set value set in the voltage setter. Therefore, it is possible to make the load currents of the two power converters the same by setting the same setting values in the voltage setting devices 32 and 52, but in reality, the setting errors of both the setting devices and the converter itself And it is difficult to balance the load current due to slight differences in the characteristics of the control device.
そこで、負荷11〜1nと各電力変換器22および42との間を流れる電流を電流検出器36および56により個別に検出して、それぞれの電力変換器に属する電圧調節器31および51に補正信号として逆極性に与える。   Therefore, the currents flowing between the loads 11 to 1n and the power converters 22 and 42 are individually detected by the current detectors 36 and 56, and the correction signals are sent to the voltage regulators 31 and 51 belonging to the respective power converters. As reverse polarity.
これにより電流検出値が大きい方の電力変換器には、電圧が高いので電圧を低下させる制御信号が加えられ、電流検出値が小さい方の電力変換器には電圧が低いので電圧を上昇させる制御信号が加えられることにより、両方の電力変換器の出力電圧が等しくなり、負荷電流を均等に分担して良好に並列運転を行うことができる。   As a result, a control signal that lowers the voltage is added to the power converter with the larger current detection value, and the control signal to lower the voltage is added to the power converter with the smaller current detection value, and the control to increase the voltage because the voltage is lower. By applying the signal, the output voltages of both power converters become equal, and the load current can be shared equally to perform the parallel operation satisfactorily.
このように、直流電力の並列給電装置においては、各直流電源の出力電圧は、通常は一定に保たれているが、直流電源を構成する電力変換器の主回路、制御装置などのハードウエアの故障、その他の異常により出力電圧が異常に上昇し過大となることがある。このように電圧が過大になると直流母線に接続された多くの負荷機器が損傷する危険がある。   As described above, in the DC power parallel power supply device, the output voltage of each DC power supply is normally kept constant, but the main circuit of the power converter constituting the DC power supply, the hardware of the control device, etc. Failure or other abnormalities can cause the output voltage to rise abnormally and become excessive. If the voltage becomes excessive in this way, there is a risk that many load devices connected to the DC bus will be damaged.
そのため、これまでは、電源装置に個々に、それぞれの出力電圧を監視する過電圧保護装置25および45を設け、出力電圧が過大になったことが検出されると、この過電圧保護装置25および45から電力変換器22および42へ動作停止指令を与えることにより、電力変換器の出力電圧を急速に低減させて負荷機器を過電圧から保護するようにしている。
特開平3−27724号公報
Therefore, until now, each of the power supply devices has been provided with overvoltage protection devices 25 and 45 for monitoring the respective output voltages. When it is detected that the output voltage has become excessive, the overvoltage protection devices 25 and 45 By giving an operation stop command to the power converters 22 and 42, the output voltage of the power converter is rapidly reduced to protect the load device from overvoltage.
JP-A-3-27724
しかしながら、このような従来装置においては、複数の直流電源装置の何れか1つに異常が生じ、その出力電圧が過大となると、直流母線の電圧が上昇するので、異常を発生した電源装置を判別することができず、すべての電源装置の過電圧保護装置が作動し、異常を発生した電源装置以外の正常に動作している電源装置も停止され、直流母線が停電する不都合がある。このため、複数の直流電源装置を備えながら1つの電源装置に過大電圧となる異常が生じた場合、これを切り離して、健全な電源装置から給電を継続することができないので給電の信頼性が低下する問題があった。   However, in such a conventional device, if an abnormality occurs in any one of a plurality of DC power supply devices and the output voltage becomes excessive, the voltage of the DC bus rises. The overvoltage protection device of all the power supply devices cannot be operated, the power supply devices that are operating normally other than the power supply device in which the abnormality has occurred are stopped, and there is a problem that the DC bus is interrupted. For this reason, when an abnormality that causes an excessive voltage occurs in a single power supply device with a plurality of DC power supply devices, the power supply reliability is reduced because the power supply cannot be continued from a healthy power supply device by disconnecting the abnormality. There was a problem to do.
この発明は、このような問題を解決して、複数の直流電源装置から並列して給電が行われる直流並列給電装置において、何れかの電源装置に出力電圧が過大となる異常が発生したとき、直流母線の電圧を急速に低下させて負荷機器を過電圧から保護すると共に異常な電源装置を切り離して健全な電源装置から負荷機器への給電を短時間のうちに再開して継続することのできる過電圧保護装置を得ることを課題とするものである。   The present invention solves such a problem, and in a DC parallel power supply device in which power is supplied in parallel from a plurality of DC power supply devices, when an abnormality in which the output voltage is excessive in any of the power supply devices occurs, Overvoltage that can rapidly reduce the voltage of the DC bus to protect the load equipment from overvoltage, disconnect the abnormal power supply, and resume the power supply from the healthy power supply to the load equipment in a short time It is an object to obtain a protective device.
このような課題を解決するため、この発明は、複数の直流電源装置から共通の負荷の接続された直流母線に並列に給電するようにした直流並列給電装置において、前記直流電源装置から給電される直流母線の一方の極性の母線を直流電源装置と同数設け、各直流電源装置の出力の一方極を各別に直流母線の一方極性の母線に接続すると共に直流電源装置の出力の他方極を直流母線の他方の極性の1つの母線に共通に接続し、前記共通の負荷の一方極を前記直流母線の一方極性の複数の母線にそれぞれダイオードを介して接続し、他方極を他方極性の1つの母線に共通に接続すると共に、前記直流母線の一方極性の複数の母線にそれぞれダイオードを介して接続された点と、他方極性の1つの母線との間の電圧を監視し、過電圧を検知したとき、前記直流母線の一方極性の複数の母線にそれぞれダイオードを介して接続された点と他方極性の1つの母線との間に限流手段を有する電圧制限回路を接続して母線電圧を低下させる過電圧保護手段と、この過電圧保護手段に前記一方極性の複数の母線から流れる各電流の差を検出し、これらの電流の大きさの関係から過電圧異常の発生している直流電源装置を判別し、異常の発生している直流電源装置に直流母線からの遮断を指令する過電圧判別手段とを設けたことを特徴とする。
In order to solve such a problem, the present invention is a DC parallel power supply apparatus in which power is supplied in parallel from a plurality of DC power supply apparatuses to a DC bus connected to a common load. Provide the same number of buses with one polarity of the DC bus as the DC power supply, connect one output pole of each DC power supply to one polarity bus of the DC bus and connect the other pole of the output of the DC power supply to the DC bus Are connected in common to one bus of the other polarity, one pole of the common load is connected to a plurality of buses of one polarity of the DC bus via diodes, and the other pole is connected to one bus of the other polarity. in addition to commonly connected, the monitor and points are connected via a diode to a plurality of bus one polarity of the DC bus, the voltage between one generatrix of the other polarity, upon detecting an overvoltage Overvoltage protection to lower the bus voltage by connecting a voltage limiting circuit having a current limiting means between one polarity a plurality of busbars on one generatrix of connected points and the other polarity via a respective diode of the DC bus And a difference between the currents flowing from the plurality of one-polarity buses to the overvoltage protection means, and the DC power supply in which the overvoltage abnormality occurs is determined from the relationship between the magnitudes of these currents. An overvoltage discrimination means for commanding the disconnection from the DC bus is provided in the generated DC power supply device.
ここで、前記過電圧保護手段と直流母線との接続を高速スイッチング手段により開閉するようにするのがよい。   Here, it is preferable that the connection between the overvoltage protection means and the DC bus is opened and closed by high-speed switching means.
この発明によれば、複数の直流電源装置から共通の負荷の接続された直流母線に並列に給電するようにした直流並列給電装置において、過電圧保護手段と異常の発生している直流電源装置を判別する手段とを設け、直流母線の一方極性の複数の母線と他方極性の共通の母線との間の電圧が過電圧となったとき、過電圧保護手段によってこれらの母線間に限流手段を備えた電圧制限回路を接続して母線電圧を低減することができると共に、判別手段により、過電圧保護手段に一方極性の各母線から流れる電流の差を検出し相互の大きさの関係から過電圧異常の発生している直流電源装置を判別し、異常の発生している直流電源装置を直流母線から遮断することができるので、直流電源装置に過電圧を発生する異常が生じても、直流母線に接続された負荷の各種の機器を過電圧から保護できるとともに、異常の発生した直流電源装置を直流母線から遮断して、正常に動作している健全な直流電源装置から負荷への給電を短時間の停止後に再開することが可能となる。 According to the present invention, in a DC parallel power supply device that supplies power in parallel to a DC bus connected to a common load from a plurality of DC power supply devices, the overvoltage protection means and the DC power supply device in which an abnormality has occurred are discriminated. And when the voltage between the plurality of buses of one polarity of the DC bus and the common bus of the other polarity becomes an overvoltage, the voltage provided with current limiting means between these buses by the overvoltage protection unit A limit circuit can be connected to reduce the bus voltage, and the discrimination means detects the difference in current flowing from each polarity bus to the overvoltage protection means, and an overvoltage abnormality occurs due to the mutual magnitude relationship. The DC power supply that is abnormal can be discriminated and disconnected from the DC bus, so that even if an abnormality that generates an overvoltage occurs in the DC power supply, it is connected to the DC bus. In addition to protecting the various devices of the load from overvoltage, shut off the abnormal DC power supply from the DC bus, and after normal power supply to the load from the healthy DC power supply is stopped for a short time It is possible to resume.
この発明の実施の形態を図に示す実施例について説明する。   Embodiments of the present invention will be described with reference to the embodiments shown in the drawings.
図1および図2は、何れもこの発明の実施例を示すもので、図1は直流並列給電装置の全体の構成図、図2は、この発明による過電圧保護装置の構成図である。   1 and 2 both show an embodiment of the present invention. FIG. 1 is an overall configuration diagram of a DC parallel power supply device, and FIG. 2 is a configuration diagram of an overvoltage protection device according to the present invention.
図1および2において、1は共通の直流母線、2および4は独立した直流電源装置である。直流母線1の正極側には、直流電源装置と同数の2本の正極母線P1−2およびP1−4が、負極側には共通の負極母線N1が設けられる。電源2、4の負極出力Nは共通の負極母線N1に共通に接続され、そして正極出力Pはそれぞれ正極母線P1−2とP1−4にそれぞれ接続される。共通の複数の負荷機器11〜1nはそれぞれ正極端子PをそれぞれダイオードD11−2、D11−4〜D1n−2、D1n−4を介して正極母線P1−2およびP1−4に並列に接続し、負極端子Nを共通の負極母線N1に並列に接続している。   1 and 2, 1 is a common DC bus, and 2 and 4 are independent DC power supplies. Two positive electrode buses P1-2 and P1-4 of the same number as the DC power supply device are provided on the positive electrode side of the DC bus 1, and a common negative electrode bus N1 is provided on the negative electrode side. The negative outputs N of the power supplies 2 and 4 are commonly connected to a common negative bus N1, and the positive outputs P are respectively connected to positive buses P1-2 and P1-4. The plurality of common load devices 11 to 1n respectively connect the positive terminal P in parallel to the positive buses P1-2 and P1-4 via the diodes D11-2, D11-4 to D1n-2, D1n-4, respectively. The negative terminal N is connected in parallel to the common negative bus N1.
7は、過電圧保護装置であり、その正極端子PがそれぞれダイオードD7−2およびD7−4を介して正極母線P1−2およびP1−4にそれぞれ接続され、負極端子Nが負極母線N1に接続される。   7 is an overvoltage protection device, the positive terminal P of which is connected to the positive buses P1-2 and P1-4 via the diodes D7-2 and D7-4, respectively, and the negative terminal N is connected to the negative bus N1. The
このように構成された直流並列給電装置においては、2つの直流電源2および4からそれぞれダイオードを介して共通の負荷11〜1nに並列に給電され、両直流電源は内蔵した自動電圧調整装置により、出力電圧を等しい所定の電圧に調整することによって各直流電源装置が均等に負荷電流を負担する。   In the DC parallel power supply apparatus configured as described above, power is supplied in parallel to the common loads 11 to 1n from the two DC power supplies 2 and 4 through the diodes, respectively. By adjusting the output voltage to an equal predetermined voltage, each DC power supply device equally bears the load current.
過電圧保護装置7は、図2に詳細を示すように、電流検出回路71、電圧制限回路72、母線電圧監視回路74、過電圧判定回路78を備えている。   As shown in detail in FIG. 2, the overvoltage protection device 7 includes a current detection circuit 71, a voltage limiting circuit 72, a bus voltage monitoring circuit 74, and an overvoltage determination circuit 78.
電流検出回路71は、それぞれダイオードD7−2、D7−4を介して正極母線P1−2、P1−4から過電圧保護装置7に引き込まれた2本の導線に流れる電流I2とI4を互いに打消し合う方向で合成して検出する直流変流器DTを備える。この直流変流器DTから得られたI2−I4に比例した検出信号Isの極性は、I2>I4のとき正、I2<I4のとき負となる。この発明においては、電流I2とI4のどちらが大きいかを判別したいので、電流検出回路71内に図示しない極性判別回路を設け、検出信号Isの極性が正のとき論理レベルH、負のとき論理レベルLの出力信号71sを出力するようにしている。   The current detection circuit 71 cancels the currents I2 and I4 flowing in the two conductors drawn into the overvoltage protection device 7 from the positive buses P1-2 and P1-4 via the diodes D7-2 and D7-4, respectively. A DC current transformer DT that combines and detects in the matching direction is provided. The polarity of the detection signal Is proportional to I2-I4 obtained from the DC current transformer DT is positive when I2> I4 and negative when I2 <I4. In the present invention, since it is desired to determine which of the currents I2 and I4 is larger, a polarity determination circuit (not shown) is provided in the current detection circuit 71, and the logic level H when the polarity of the detection signal Is is positive and the logic level when it is negative. The output signal 71s of L is output.
また、電圧制限回路72は、サイリスタ等で構成された高速スイッチング素子Thと限流抵抗R0とを直列接続して構成され、ダイオードD7−2とD7−4の共通接続点と負極母線N1との間に接続されている。   The voltage limiting circuit 72 is configured by connecting a high-speed switching element Th formed of a thyristor or the like and a current limiting resistor R0 in series, and a common connection point between the diodes D7-2 and D7-4 and the negative electrode bus N1. Connected between.
電圧監視回路74は、分圧抵抗R1,R2と、電圧設定器R0と、比較器CPPと、この比較器CPPの出力信号に応じて高速スイッチング素子Thに導通信号を与える導通信号発生回路Tとを備えている。分圧抵抗R1,R2はダイオードD7−2とD7−1の共通接続点と負極母線N1との間に接続され、正極母線P1−2、P1−4と負極母線N1に加わる直流電源装置2,4から加わる母線電圧を分圧し、分圧した電圧を比較器CPの比較端子+に加える。比較器CPの基準端子−に加えられる基準電圧Esは、電圧設定器Rs1,Rs2により母線電圧の定格電圧より例えば10%程度高い値に設定する。比較器CPは、常に比較端子に加えられる母線電圧ELを設定電圧Esと比較して、母線電圧ELが設定電圧Esを越えていないかどうかを監視し、EL>Esとなったとき、母線電圧ELが過大となったことを示すために検出信号74sを論理レベルLからHへ変化させる。導通信号発生回路Tは、検出信号74sがLからHに変化したとき導通信号Tsを発生し、電圧制限回路72のスイッチング素子Thに導通信号を与え、これを導通させる。 The voltage monitoring circuit 74 includes voltage dividing resistors R1 and R2, a voltage setting unit R0, a comparator CPP, and a conduction signal generating circuit T that provides a conduction signal to the high-speed switching element Th according to the output signal of the comparator CPP. It has. The voltage dividing resistors R1 and R2 are connected between the common connection point of the diodes D7-2 and D7-1 and the negative electrode bus N1, and are connected to the positive electrode buses P1-2, P1-4 and the negative electrode bus N1. The bus voltage applied from 4 is divided, and the divided voltage is applied to the comparison terminal + of the comparator CP. The reference voltage Es applied to the reference terminal − of the comparator CP is set to a value, for example, about 10% higher than the rated voltage of the bus voltage by the voltage setting devices Rs1 and Rs2. The comparator CP always compares the bus voltage E L applied to the comparison terminal with the set voltage Es to monitor whether the bus voltage E L exceeds the set voltage Es, and when E L > Es , it changes the detection signal 74s to indicate that the bus voltage E L becomes excessively from a logic level L to H. The conduction signal generation circuit T generates a conduction signal Ts when the detection signal 74s changes from L to H, and gives a conduction signal to the switching element Th of the voltage limiting circuit 72 to make it conductive.
過電圧判定回路78は、2つのアンドゲートA2、A4と1つのノットゲートN4とを備える。アンドゲートA2とA4の一方の入力端子には電圧監視回路74の出力信号74sが加えられ、他方の入力端子に電流検出回路71の出力信号71sが直接またはノット回路N4を介して加えられる。アンドゲートA2の出力は、図1の直流電源装置2への遮断指令信号SD2となり、アンドゲートA4の出力は直流電源装置4への遮断指令信号SD4となる。   The overvoltage determination circuit 78 includes two AND gates A2 and A4 and one not gate N4. The output signal 74s of the voltage monitoring circuit 74 is applied to one input terminal of the AND gates A2 and A4, and the output signal 71s of the current detection circuit 71 is applied to the other input terminal directly or via the knot circuit N4. The output of the AND gate A2 becomes the cutoff command signal SD2 to the DC power supply device 2 in FIG. 1, and the output of the AND gate A4 becomes the cutoff command signal SD4 to the DC power supply device 4.
次に、このように構成されたこの発明の実施例装置の動作を説明する。   Next, the operation of the apparatus according to the embodiment of the present invention thus configured will be described.
直流電源装置2と4が正常に動作しているときは、両方の電源装置の出力電圧が所定の等しい定格電圧に保たれているため、正極母線P1−2とP1−4から各負荷に供給される電流は等しく両方の電源装置が負荷電流を等しく分担する。そして過電圧保護装置7にもダイオードD7−2およびD7−4を介して加わる正極母線P1−2およびP1−4の電圧も定格電圧であるため、比較器CPの出力はLレベルとなっている。これにより導通信号発生回路Tの導通信号74Tが停止されているので、過電圧制限手段72のスイッチング素子Thは非導通となり、電流検出回路71には電流が流れない。   When the DC power supply devices 2 and 4 are operating normally, the output voltages of both power supply devices are maintained at a predetermined equal rated voltage, and therefore supplied to each load from the positive buses P1-2 and P1-4. Currents are equal and both power supplies share the load current equally. Since the voltages of positive buses P1-2 and P1-4 applied to overvoltage protection device 7 via diodes D7-2 and D7-4 are also rated voltages, the output of comparator CP is at the L level. As a result, the conduction signal 74T of the conduction signal generation circuit T is stopped, so that the switching element Th of the overvoltage limiting means 72 becomes non-conductive, and no current flows through the current detection circuit 71.
過電圧判別回路78には、電圧監視回路74からLレベルの信号74sが加わっているのでアンドゲートA2、A4から出力される遮断指令信号SD2、SD4はLレベルとなっている。このため、直流電源装置2、4は遮断されることなく運転を継続する。   Since the L voltage signal 74s is applied from the voltage monitoring circuit 74 to the overvoltage discrimination circuit 78, the cutoff command signals SD2 and SD4 output from the AND gates A2 and A4 are at the L level. For this reason, the DC power supply devices 2 and 4 continue to operate without being cut off.
今、何らかの故障により直流電源装置2から電圧監視回路74の設定電圧Esを越える出力電圧が発生され、正極母線P1−2の電圧が過大になったものとする。このように正極母線P1−2の電圧が過大になると、電圧監視手段74の接続されたダイオードD7−2とD7−4の共通接続点の電圧が上昇し、分圧器R1、R2から比較器CPの比較端子+に加えられる比較電圧ELが基準端子−に加えられた設定電圧Esより大きくなるため、比較器CPの出力信号74sがHレベルとなって母線電圧が過大になったことが検知される。これだけでは、2つの直流電源装置の何れが過電圧異常となっているかの判別はできない。 Now, it is assumed that an output voltage exceeding the set voltage Es of the voltage monitoring circuit 74 is generated from the DC power supply device 2 due to some failure, and the voltage of the positive bus P1-2 becomes excessive. Thus, when the voltage of the positive bus P1-2 becomes excessive, the voltage at the common connection point of the diodes D7-2 and D7-4 to which the voltage monitoring means 74 is connected rises, and the voltage divider R1, R2 to the comparator CP. It is detected that the output voltage 74s of the comparator CP has become H level and the bus voltage has become excessive because the comparison voltage E L applied to the comparison terminal + is greater than the set voltage Es applied to the reference terminal −. Is done. This alone cannot determine which of the two DC power supply devices has an overvoltage abnormality.
比較器CPの出力信号74sがHレベルとなると、直ちに導通信号発生回路Tが導通信号Tsを発生して、電圧制限回路72のスイッチング素子Thに与えるので、このスイッチング素子Thが導通し正極母線P1−2およびP1−4と負極母線N1間が限流抵抗R0を介して短絡されるため、限流抵抗R0によって母線電圧が負荷11〜1nの許容電圧より低い電圧まで低下され過電圧状態が解消される。そしてこのとき正極母線P1−2、P1−4から限流抵抗R0を通して電流I2、I4が流れる。正極母線P1−2の電圧が過大となっているので、電流I2とI4はI2>I4の関係にあるため、I2−I4の合成電流Isは正となり、電流検出器71からは、Hレベルの出力信号71sが出力され、過電圧判定回路78のアンドゲートA2に直接、アンドゲートA4にノットゲートNを介して加えられる。   As soon as the output signal 74s of the comparator CP becomes H level, the conduction signal generation circuit T generates the conduction signal Ts and supplies it to the switching element Th of the voltage limiting circuit 72, so that the switching element Th becomes conductive and the positive bus P1. -2 and P1-4 and the negative electrode bus N1 are short-circuited via the current limiting resistor R0, the current limiting resistor R0 reduces the bus voltage to a voltage lower than the allowable voltage of the loads 11 to 1n, thereby eliminating the overvoltage state. The At this time, currents I2 and I4 flow from the positive buses P1-2 and P1-4 through the current limiting resistor R0. Since the voltage of the positive bus P1-2 is excessive, the currents I2 and I4 are in a relationship of I2> I4. Therefore, the combined current Is of I2-I4 becomes positive, and the current detector 71 receives an H level signal. An output signal 71s is output and applied directly to the AND gate A2 of the overvoltage determination circuit 78 and to the AND gate A4 via the not gate N.
これによって、過電圧判定回路78のアンドゲートA2の2つの入力がHレベルとなって、直流電源装置2に過電圧異常が発生したことが判別される。このアンドゲートA2の出力の遮断指令信号SD2がHレベルとなり、過電圧異常となった直流電源装置2に与えられることによりこの直流電源装置2が遮断される。これによって母線1の過電圧は完全に解除されるとともに、直流電源装置4は過電圧保護回路7に通常の出力電流を上回る大きな電流を供給することになるので、過電流保護検出により停止となる。この後、直流電源回路2が異常であることが判明しているため、直流電源装置4を再起動することにより、母線電圧は所定の定格電圧に戻る。負荷11〜1nへの給電は、正常に動作している直流電源装置4から行われるので負荷11〜1nは短時間のうちに再開して継続して運転することができる。 As a result, it is determined that the two inputs of the AND gate A2 of the overvoltage determination circuit 78 are at the H level and an overvoltage abnormality has occurred in the DC power supply device 2. The cutoff command signal SD2 of the output of the AND gate A2 becomes H level and is applied to the DC power supply device 2 in which the overvoltage is abnormal, whereby the DC power supply device 2 is shut off. This together with the overvoltage of the bus 1 is released completely, the DC power supply 4 so will supply a large current exceeding the normal output current to the overvoltage protection circuit 7 becomes more stop overcurrent protection detection. Thereafter, since it is found that the DC power supply circuit 2 is abnormal, the bus voltage returns to a predetermined rated voltage by restarting the DC power supply device 4. Since the power supply to the loads 11 to 1n is performed from the DC power supply device 4 operating normally, the loads 11 to 1n can be restarted and operated continuously in a short time.
この過程で母線1の過電圧が解除されるとともに、直流電源装置4が一旦出力停止することにより、電圧監視回路74の出力信号74sはLレベルに戻るため、導通信号発生回路Tで発生される導通信Ts号が停止され、電圧制限回路72のスイッチング素子Thが不導通となって電圧制限回路72が母線1から切り離され、電圧制限機能が除かれる。   In this process, the overvoltage of the bus 1 is released and the output of the DC power supply device 4 is temporarily stopped, so that the output signal 74s of the voltage monitoring circuit 74 returns to the L level. The communication Ts is stopped, the switching element Th of the voltage limiting circuit 72 is turned off, the voltage limiting circuit 72 is disconnected from the bus 1, and the voltage limiting function is removed.
直流電源装置4に過電圧異常が発生した場合は、電圧制限回路に流れる電流がI2<I4となって、過電圧判定手段のアンドゲートA4から出力される遮断司令信号SD4がHレベルとなり、直流電源装置4に与えられるようになるため、この過電圧異常を発生している直流電源装置4が遮断され母線1の過電圧が解消されるようになる。   When an overvoltage abnormality occurs in the DC power supply device 4, the current flowing through the voltage limiting circuit becomes I2 <I4, the shutoff command signal SD4 output from the AND gate A4 of the overvoltage determination means becomes H level, and the DC power supply device 4, the DC power supply device 4 in which this overvoltage abnormality has occurred is cut off and the overvoltage of the bus 1 is eliminated.
このようにこの発明によれば、複数の直流電源装置から負荷の接続された共通の直流母線に並列に給電するようにした直流並列給電装置において、1つの直流電源装置の出力電圧が過電圧となる異常が発生した場合、この過電圧を検出して電圧制限回路により母線電圧を負荷の許容する電圧以下の電圧に制限すると共に、過電圧判別回路により過電圧を発生している直流電源装置を判別し、判別された直流電源装置を遮断開放するようにしているので、直流母線の過電圧を短時間で解消することができると共に、健全な直流電源装置から負荷への給電を短時間の停止後に再開することができる。したがって直流並列給電装置における負荷を過電圧から保護できると共に直流並列給電装置の信頼性が向上する。   As described above, according to the present invention, in a DC parallel power supply apparatus that supplies power in parallel to a common DC bus connected to a load from a plurality of DC power supply apparatuses, the output voltage of one DC power supply apparatus becomes an overvoltage. When an abnormality occurs, this overvoltage is detected and the voltage limit circuit limits the bus voltage to a voltage that is less than or equal to the voltage allowed by the load, and the overvoltage discrimination circuit discriminates the DC power supply that is generating the overvoltage. Therefore, it is possible to eliminate the overvoltage of the DC bus in a short time and to restart the power supply from the sound DC power supply to the load after a short stop. it can. Therefore, the load in the DC parallel power supply device can be protected from overvoltage, and the reliability of the DC parallel power supply device is improved.
この発明の実施例による直流並列給電装置の全体示す構成図である。Is a block diagram illustrating an overall structure of a DC parallel power feeding device according to an embodiment of the present invention. この発明に使用する過電圧保護装置の詳細を示す構成図である。It is a block diagram which shows the detail of the overvoltage protection apparatus used for this invention. 従来の直流並列給電装置を示す構成図である。It is a block diagram which shows the conventional direct current | flow parallel electric power feeder.
1:直流母線
P1−2、P1−4:正極母線
N1:負極母線
2、4:直流電源装置
7:過電圧保護装置
71:電流検出器
72:電圧制限回路
74:電圧監視回路
78:過電圧判別回路
11〜1n:負荷
D7−2、D7−4〜D1n−2、D1n−4:ダイオード
1: DC bus P1-2, P1-4: Positive bus N1: Negative bus 2, 4: DC power supply device 7: Overvoltage protection device 71: Current detector 72: Voltage limiter circuit 74: Voltage monitoring circuit 78: Overvoltage discrimination circuit 11 to 1n: Load D7-2, D7-4 to D1n-2, D1n-4: Diode

Claims (1)

  1. 複数の直流電源装置から共通の負荷の接続された直流母線に並列に給電するようにした直流並列給電装置において、前記直流電源装置から給電される直流母線の一方の極性の母線を直流電源装置と同数設け、各直流電源装置の出力の一方極を各別に直流母線の一方極性の母線に接続すると共に直流電源装置の出力の他方極を直流母線の他方の極性の1つの母線に共通に接続し、前記共通の負荷の一方極を前記直流母線の一方極性の複数の母線にそれぞれダイオードを介して接続し、他方極を他方極性の1つの母線に共通に接続すると共に、前記直流母線の一方極性の複数の母線にそれぞれダイオードを介して接続された点と、他方極性の1つの母線との間の電圧を監視し、過電圧を検知したとき、前記直流母線の一方極性の複数の母線にそれぞれダイオードを介して接続された点と他方極性の1つの母線との間に限流手段を有する電圧制限回路を接続して母線電圧を低下させる過電圧保護手段と、この過電圧保護手段に前記一方極性の複数の母線から流れる各電流の差を検出し、これらの電流の大きさの関係から過電圧異常の発生している直流電源装置を判別し、異常の発生している直流電源装置に直流母線からの遮断を指令する過電圧判別手段とを設けたことを特徴とする直流並列給電装置の過電圧保護装置。 In a DC parallel power supply device that supplies power in parallel to a DC bus connected to a common load from a plurality of DC power supply devices, one polarity bus of the DC bus fed from the DC power supply device is connected to the DC power supply device. Provide the same number, connect one pole of the output of each DC power supply to one polarity bus of the DC bus and connect the other pole of the output of the DC power supply in common to one bus of the other polarity of the DC bus And connecting one pole of the common load to a plurality of buses of one polarity of the DC bus via diodes, and connecting the other pole to one bus of the other polarity in common and one polarity of the DC bus a point which is respectively connected via a diode to a plurality of busbars of, monitors the voltage between one generatrix of the other polarity, when detecting overvoltage, it into a plurality of bus bars of one polarity of the DC bus Re and overvoltage protection means for reducing the bus voltage by connecting a voltage limiting circuit having a current limiting means between the one bus of the connected point to the other polarity through diode, said one polarity to the overvoltage protection means The difference between the currents flowing from the plurality of buses is detected, the DC power supply device in which the overvoltage abnormality has occurred is determined from the relationship between the magnitudes of these currents, and the DC power supply device in which the abnormality has occurred An overvoltage protection device for a DC parallel power supply device, characterized in that an overvoltage discrimination means for commanding the interruption of the DC is provided.
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