JP2016185005A - Operation switching device of hydraulic power generation system - Google Patents

Operation switching device of hydraulic power generation system Download PDF

Info

Publication number
JP2016185005A
JP2016185005A JP2015063553A JP2015063553A JP2016185005A JP 2016185005 A JP2016185005 A JP 2016185005A JP 2015063553 A JP2015063553 A JP 2015063553A JP 2015063553 A JP2015063553 A JP 2015063553A JP 2016185005 A JP2016185005 A JP 2016185005A
Authority
JP
Japan
Prior art keywords
control
inverter
power generation
generator
control inverter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2015063553A
Other languages
Japanese (ja)
Other versions
JP6488814B2 (en
Inventor
淳也 矢野
Junya Yano
淳也 矢野
昌司 滝口
Masashi Takiguchi
昌司 滝口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP2015063553A priority Critical patent/JP6488814B2/en
Publication of JP2016185005A publication Critical patent/JP2016185005A/en
Application granted granted Critical
Publication of JP6488814B2 publication Critical patent/JP6488814B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that it takes time for switching to autonomous operation due to an accident of an AC system, during interconnection operation of a hydraulic power generating system and the AC system.SOLUTION: Occurrence of abnormality in an AC system is detected by detection means, a generator control inverter is switched to autonomous operation mode of DC voltage constant control upon occurrence of abnormality, a system interconnection control inverter is subjected to gate block, and the energy generated in the DC circuit of a converter device via a control unit is consumed by a brake resistor. Furthermore, determination means for determining whether or not the control start conditions for autonomous operation are satisfied is provided. When the control start conditions for autonomous operation are satisfied, a switch for system interconnection is closed, and the system interconnection control inverter is switched to an operation mode of output voltage constant control, and the generator control inverter is switched to an operation mode of DC voltage constant control.SELECTED DRAWING: Figure 2

Description

本発明は、水力発電システムの運転切換装置に係わり、特に水力発電システムと交流系統との連系運転から自立運転へ切り換える切換装置に関するものである。   The present invention relates to an operation switching device for a hydroelectric power generation system, and more particularly to a switching device for switching from a linked operation of a hydropower generation system and an AC system to a self-sustained operation.

図１は、永久磁石同期発電機を用いた水力可変速の発電システムの単結線図を示したもので、この水力発電システムでは水車発電設備１、コンバータ装置６及び連系変圧器１７を介して交流系統１９に連系される。水車発電設備１は、ガバナ等からなる流量調節手段５、水車２、フライホイール４及び永久磁石同期発電機３を有し、これら水車２、フライホイール４及び永久磁石同期発電機３は図示省略された軸受けを介して連結されている。   FIG. 1 shows a single connection diagram of a hydraulic variable speed power generation system using a permanent magnet synchronous generator. In this hydraulic power generation system, a turbine power generation facility 1, a converter device 6 and an interconnection transformer 17 are used. It is connected to the AC system 19. The water turbine power generation facility 1 includes a flow rate adjusting means 5 including a governor, a water wheel 2, a flywheel 4, and a permanent magnet synchronous generator 3. The water turbine 2, the flywheel 4 and the permanent magnet synchronous generator 3 are not illustrated. Are connected via a bearing.

コンバータ装置６は、発電機制御インバータ７、系統連系制御インバータ８および各インバータ７，８間の直流回路に接続された直流コンデンサ１３と、制動ユニット９と制動抵抗器１０を有して制御装置２２により制御される。また、１４はフィルタで、リアクトルＬ，コンデンサＣ，抵抗Ｒより構成されている。１１は発電機側の開閉器、１２は系統側に接続された開閉器、１５は系統連系点の電圧を検出する変圧器、１６は特定負荷、２０は系統母線側の開閉器、２１は自立運転中に交流系統の電圧を検出する手段として設けられた変圧器である。   The converter device 6 includes a generator control inverter 7, a grid connection control inverter 8, a DC capacitor 13 connected to a DC circuit between the inverters 7, 8, a braking unit 9, and a braking resistor 10. 22. Reference numeral 14 denotes a filter, which includes a reactor L, a capacitor C, and a resistor R. 11 is a switch on the generator side, 12 is a switch connected to the system side, 15 is a transformer for detecting the voltage at the grid connection point, 16 is a specific load, 20 is a switch on the system bus side, and 21 is a switch It is a transformer provided as means for detecting the voltage of the AC system during self-sustained operation.

１８は上位の制御部で、この制御部１８はコンバータ装置６に対して運転指令情報や系統母線側の開閉器２０の開閉情報及びコンバータ装置６からのステータス情報を出力する等の信号の授受を行うと共に、流量調節手段５を介して水車の流量を調節する。   Reference numeral 18 denotes a higher-level control unit. The control unit 18 sends and receives signals such as output of operation command information, switching information of the switch 20 on the system bus side, and status information from the converter device 6 to the converter device 6. At the same time, the flow rate of the water turbine is adjusted via the flow rate adjusting means 5.

コンバータ装置６は、通常、交流系統との連系運転を行っており、特定負荷１６の消費電力＞発電能力のときには交流系統１９から不足分の電力を補い、特定負荷１６の消費電力＜発電能力のときには余剰発電量を交流系統に供給している。このとき、発電機制御インバータ７は、永久磁石同期発電機３の速度又はトルクを制御する発電機速度（トルク）制御ＡＳＲと交流電流制御ＡＣＲを行い、系統連系制御インバータ８は直流電圧（直流コンデンサ１３の電圧）制御ＡＶＲと交流電流制御ＡＣＲを行う。   The converter device 6 normally performs an interconnection operation with the AC system. When the power consumption of the specific load 16> the power generation capability, the converter device 6 compensates for the insufficient power from the AC system 19, and the power consumption of the specific load 16 <the power generation capability. In this case, surplus power is supplied to the AC system. At this time, the generator control inverter 7 performs a generator speed (torque) control ASR and an AC current control ACR for controlling the speed or torque of the permanent magnet synchronous generator 3, and the grid interconnection control inverter 8 is connected to a DC voltage (DC). The voltage A) control AVR and the AC current control ACR are performed.

この連系運転では交流系統１９の正常時には水車発電設備１に対して出力最大点追従（以下、ＭＰＰＴという）制御で運転されている。連系運転中に交流系統１９に系統故障が発生すると、制御部１８は開閉器２０を開とし、コンバータ装置６は系統連系制御インバータ８の運転を停止して故障情報を上位の制御部１８に通知する。また、制御部１８は故障情報を基に水車２を停止させる。水車２が起動停止するまでの発電エネルギーは、制動ユニットに流して消費される。   In this interconnected operation, when the AC system 19 is normal, the turbine power generation facility 1 is operated by maximum output point tracking (hereinafter referred to as MPPT) control. When a system failure occurs in the AC system 19 during the interconnection operation, the control unit 18 opens the switch 20, and the converter device 6 stops the operation of the system interconnection control inverter 8 and provides the failure information to the upper control unit 18. Notify Moreover, the control part 18 stops the water turbine 2 based on failure information. The power generation energy until the water turbine 2 is started and stopped is passed through the braking unit and consumed.

水車発電設備１とコンバータ装置６の停止状態から自立運転に移行するためには、制御部１８からコンバータ装置６に対しして運転方式切換指令が発しられ、この指令に基づいて自立運転への切換が行われる。
発電システムの自立運転方法としては、特許文献１や特許文献２が公知となっている。 In order to shift from the stopped state of the water turbine power generation equipment 1 and the converter device 6 to the independent operation, an operation mode switching command is issued from the control unit 18 to the converter device 6, and based on this command, switching to the independent operation is performed. Is done.
Patent documents 1 and patent documents 2 are publicly known as a self-sustaining operation method of a power generation system.

特開平６−３３５１６９JP-A-6-335169 特開２０１４−１５８３７１JP2014-158371A

交流系統１９に故障が発生して連系運転から自立運転への切換時に、制御部１８からコンバータ装置６に対して運転方式切換指令が発せられると、コンバータ装置６側では手動操作が必要となっている。このとき、発電機制御インバータ７は、連系運転時の発電機と交流電流制御から直流電圧一定制御ＡＶＲに、また、系統連系制御インバータ８は直流電圧一定制御ＡＶＲと交流電流制御ＡＣＲから交流電圧一定制御ＡＶＲへと各制御モードを切替える。これにより、特定負荷１６に所望の交流出力電圧を供給する自立運転が実現する。   When a fault occurs in the AC system 19 and the control unit 18 issues an operation system switching command to the converter device 6 when switching from the grid operation to the independent operation, manual operation is required on the converter device 6 side. ing. At this time, the generator control inverter 7 switches from the generator and AC current control during interconnection operation to DC voltage constant control AVR, and the grid interconnection control inverter 8 exchanges AC from the DC voltage constant control AVR and AC current control ACR. Each control mode is switched to constant voltage control AVR. Thereby, a self-sustained operation for supplying a desired AC output voltage to the specific load 16 is realized.

なお、自立運転中に交流系統１９が正常に複電した場合には、負荷に対する電力供給の信頼性を確保することとＭＰＰＴ制御による制御を早急に行う必要がある。ＭＰＰＴ制御は、水車２の効率特性曲線として、例えば開度１００％時の効率特性曲線を用い場合、最大発電出力速度ｎo以上の速度範囲で負荷の増減に対応して流量調節手段５が調節されて永久磁石同期発電機３の出力が制御される。このため、ＭＰＰＴ制御が確立するまで時間を要し、自動的で短時間での切換制御が要望されている。   Note that, when the AC system 19 normally doubles power during self-sustained operation, it is necessary to ensure the reliability of power supply to the load and to perform control by MPPT control immediately. In the MPPT control, for example, when an efficiency characteristic curve at an opening degree of 100% is used as the efficiency characteristic curve of the water turbine 2, the flow rate adjusting means 5 is adjusted corresponding to the increase or decrease of the load in a speed range of the maximum power generation output speed no or more. Thus, the output of the permanent magnet synchronous generator 3 is controlled. For this reason, it takes time until MPPT control is established, and automatic and short-time switching control is desired.

本発明が目的とするところは、連系運転から自立運転への切換を自動的に移行させる水力発電システムにおける切換装置を提供することにある。   An object of the present invention is to provide a switching device in a hydroelectric power generation system that automatically shifts switching from the grid operation to the independent operation.

本発明は、水車と連結された永久磁石同期発電機を、発電機制御インバータおよび系統連系制御インバータを有するコンバータ装置に接続し、コンバータ装置及び開閉器を介して交流系統に接続し、コンバータ装置の上位の制御系として制御部を備えてコンバータ装置と制御部間での情報の授受を行い、且つ制御部により流量調節手段を調節して水車への流量を調節する水力発電システムであって、水力発電システムの自立運転時には、発電機制御インバータを直流電圧一定制御に、系統連系制御インバータを出力電圧一定制御する機能を備えた制御装置において、
前記コンバータ装置の直流回路に制動ユニットを介して制動抵抗を接続し、
前記制御装置は、前記交流系統における異常発生を検出する検出手段と、
前記検出手段による異常検出時に前記発電機制御インバータに対して直流電圧一定制御の自立運転モードに切換え、前記系統連系制御インバータに対してはゲートブロックすると共に、前記制動ユニットを介してコンバータ装置の直流回路に発生したエネルギーを制動抵抗により消費させる手段と、
自立運転への制御開始条件が成立したか否かを判断する判断手段と、
前記判断手段による自立運転への制御開始条件成立時に系統連系用の開閉器に対して閉路信号を出力し、前記系統連系制御インバータに対しては出力電圧一定制御に、前記発電機制御インバータに対しては直流電圧一定制御に運転モードを切換制御する手段、
を備えたことを特徴としたものである。 The present invention relates to a permanent magnet synchronous generator coupled to a water turbine connected to a converter device having a generator control inverter and a grid interconnection control inverter, and connected to an AC system via the converter device and a switch. A hydroelectric power generation system that includes a control unit as a higher-level control system, exchanges information between the converter device and the control unit, and adjusts the flow rate adjusting means by the control unit to adjust the flow rate to the water turbine, At the time of self-sustained operation of the hydroelectric power generation system, in the control device having the function of controlling the generator control inverter to DC voltage constant control and the grid connection control inverter to output voltage constant control,
A braking resistor is connected to the DC circuit of the converter device via a braking unit,
The control device includes detection means for detecting occurrence of abnormality in the AC system;
When an abnormality is detected by the detection means, the generator control inverter is switched to a self-sustained operation mode of constant DC voltage control, the grid interconnection control inverter is gate-blocked, and the converter unit is connected via the braking unit. Means for consuming the energy generated in the DC circuit by a braking resistor;
A judging means for judging whether or not a control start condition for autonomous operation is satisfied;
When the control start condition for the independent operation by the determination means is satisfied, a closing signal is output to the switch for grid connection, and the generator control inverter is set to a constant output voltage control for the grid connection control inverter. Means for switching and controlling the operation mode to DC voltage constant control,
It is characterized by having.

本発明の判断手段は、前記交流系統の複電時に投入される開閉器が開放され、前記永久磁石同期発電機の速度が最大速度以上であることを条件に自立運転の制御開始条件の成立信号を出力することを特徴としたものである。   The determination means of the present invention is a signal for establishing a control start condition for a self-sustaining operation on the condition that the switch that is turned on when the AC system is double-powered is opened and the speed of the permanent magnet synchronous generator is equal to or greater than the maximum speed. Is output.

また、本発明の制御装置は、自立運転開始時に前記系統連系制御インバータの出力電圧がランプ状に出力するよう出力電圧指令値にクッション特性を持たせたことを特徴としたものである。   The control device according to the present invention is characterized in that the output voltage command value has a cushion characteristic so that the output voltage of the grid interconnection control inverter is output in a ramp shape at the start of independent operation.

以上のとおり、本発明によれば、水力発電システムと交流系統との連系運転時に、交流系統で停電等の要因によって連系運転から自動的に自立運転への切換が可能となるものである。これにより、人手を介することなく短時間での切換制御が可能となるものである。   As described above, according to the present invention, at the time of the interconnection operation between the hydroelectric power generation system and the AC system, it is possible to automatically switch from the interconnection operation to the self-sustained operation due to a power failure or the like in the AC system. . As a result, switching control can be performed in a short time without manual intervention.

本発明の水力発電システムの構成図。The block diagram of the hydroelectric power generation system of this invention. 連系運転から自立運転への切換時のフローチャート。A flow chart at the time of switching from the grid operation to the independent operation. 連系運転から自立運転への切換時のタイミングチャート。A timing chart at the time of switching from the grid operation to the independent operation. 水車特性図。Water wheel characteristic diagram. 他の実施例による連系運転から自立運転への切換時のタイミングチャート。The timing chart at the time of the switching from the interconnection operation to the independent operation according to another embodiment. 制動ユニットの動作状態図。The operation state figure of a braking unit.

本発明は、交流系統と連系運転される水力発電システムの制御装置において交流系統における異常発生を検出手段を設け、制御装置は異常検出時に発電機制御インバータに対して直流電圧一定制御の自立運転モードに切換え、系統連系制御インバータに対してはゲートブロックすると共に、制動ユニットを介してコンバータ装置の直流回路に発生したエネルギーを制動抵抗により消費させる。また、自立運転への制御開始条件が成立したか否かを判断する判断手段を設け、自立運転への制御開始条件成立時に系統連系用の開閉器を閉路し、系統連系制御インバータに対しては出力電圧一定制御に、発電機制御インバータに対しては直流電圧一定制御に運転モードを切換制御するものである。以下図に基づいて詳述する。   The present invention provides a detection unit for detecting an abnormality in an AC system in a control device for a hydroelectric power generation system that is linked to an AC system, and the control device performs independent DC voltage constant control with respect to a generator control inverter when an abnormality is detected. The mode is switched to gate block for the grid interconnection control inverter, and the energy generated in the DC circuit of the converter device via the braking unit is consumed by the braking resistor. In addition, a judgment means is provided for judging whether or not the control start condition for the autonomous operation is satisfied, and the system interconnection switch is closed when the control start condition for the autonomous operation is established, The operation mode is switched to the constant output voltage control, and the generator control inverter is switched to the constant DC voltage control. This will be described in detail with reference to the drawings.

図２は、本発明による連系運転から自立運転への切換時のフローチャートを示し、図３は切換時のタイミングチャートを示したものである。
図１で示す水力発電システムと交流系統１９との連系運転中（Ｓ１）に、交流系統１９に異常が発生して特定負荷１６の端子電圧が時刻ｔ１で低下し、変圧器２１による電圧検出の低下を基に制御装置２２はステップＳ２で故障検出信号を発生し、系統連系制御インバータ８をゲートブロックし、開閉器１２を開放すると共に、上位の制御部１８により開閉器２０を開放（Ｓ３〜Ｓ５）する。 FIG. 2 shows a flowchart at the time of switching from the interconnected operation to the independent operation according to the present invention, and FIG. 3 shows a timing chart at the time of switching.
During the interconnection operation between the hydroelectric power generation system shown in FIG. 1 and the AC system 19 (S1), an abnormality occurs in the AC system 19, the terminal voltage of the specific load 16 decreases at time t1, and the voltage is detected by the transformer 21. The control device 22 generates a failure detection signal in step S2 based on the decrease in the power supply, blocks the system interconnection control inverter 8, gates the switch 12, opens the switch 12, and opens the switch 20 by the upper control unit 18 ( S3-S5).

系統連系制御インバータ８がゲートブロックされたことにより直流コンデンサ１３の端子電圧が上昇する。制御装置２２は時刻ｔ１で制動ユニット９をオンしてコンバータ装置６の中間回路に発生したエネルギーを制動抵抗器１０に流して消費させる。   As the grid interconnection control inverter 8 is gate-blocked, the terminal voltage of the DC capacitor 13 increases. The control device 22 turns on the braking unit 9 at time t1 and causes the energy generated in the intermediate circuit of the converter device 6 to flow through the braking resistor 10 for consumption.

図６は制動ユニット９の動作状態を示したもので、コンバータ装置６の中間回路の直流電圧設定値に対し、電圧上昇したとき制動ユニット９がオン動作する電圧値とオフ動作する電圧値のレベルを予め設定し、設定した電圧間でオン・オフ動作を繰り返して制動抵抗器１０でエネルギーを消費するものである。これにより、制動ユニット９の制御回路を単純な回路でオン・オフ動作させ、中間回路の直流電圧の過電圧を防止し、コンバータ装置６が過電圧により停止するのを防止する。   FIG. 6 shows the operating state of the braking unit 9. The level of the voltage value at which the braking unit 9 is turned on and the voltage value at which it is turned off when the voltage rises with respect to the DC voltage setting value of the intermediate circuit of the converter device 6. Is set in advance, and the on / off operation is repeated between the set voltages, and the braking resistor 10 consumes energy. As a result, the control circuit of the braking unit 9 is turned on and off with a simple circuit, the overvoltage of the DC voltage of the intermediate circuit is prevented, and the converter device 6 is prevented from being stopped by the overvoltage.

また、制御装置２２は、ステップＳ６で発電機制御インバータ７に対する制御モードを自立運転モードとし、連系運転時の発電機制御モードから直流電圧一定制御に移行する。   In step S6, the control device 22 sets the control mode for the generator control inverter 7 to the self-sustaining operation mode, and shifts from the generator control mode at the time of the grid operation to the DC voltage constant control.

Ｓ７では自立運転条件が成立したか否かが判断される。この判断要件としては系統母線用の開閉器２０は開放されているか、発電機速度がＭＰＰＴ制御に対応できる最大出力特性になっているか等が判断される。また、特定負荷１６の容量と永久磁石同期発電機３の発電能力との関係において、特定負荷１６の消費電力＞永久磁石同期発電機３の発電能力の場合と、特定負荷１６の消費電力＜永久磁石同期発電機３の発電能力と２つのモードが存在する。   In S7, it is determined whether or not the independent operation condition is satisfied. As the determination requirements, it is determined whether the switch 20 for the system bus is open, whether the generator speed has a maximum output characteristic that can support MPPT control, and the like. Further, in the relationship between the capacity of the specific load 16 and the power generation capacity of the permanent magnet synchronous generator 3, the power consumption of the specific load 16> the power generation capacity of the permanent magnet synchronous generator 3 and the power consumption of the specific load 16 <permanent There are two modes of power generation capability of the magnet synchronous generator 3.

モードが前者の場合には、系統連系制御インバータ８の運転後に発電能力不足となって停止する。Ｓ７では自立運転の開始条件とする水車速度が最大出力速度ｎ0以上であるなどを判断してＳ８（時刻ｔ３）で開閉器１２に対する投入指令を出力する。時刻ｔ４では、制御装置２２はＳ９で系統連系制御インバータ８に対して出力電圧制御の自立運転モードでの制御を開始し、特定負荷１６に電力を供給する。 When the mode is the former, the power generation capacity becomes insufficient after the operation of the grid interconnection control inverter 8 and stops. In S7, it is determined that the turbine speed, which is the starting condition for the independent operation, is equal to or higher than the maximum output speed n 0 , and a closing command for the switch 12 is output in S8 (time t3). At time t4, the control device 22 starts control in the self-sustained operation mode of output voltage control for the grid interconnection control inverter 8 in S9, and supplies power to the specific load 16.

図４は水車の特性図で、水車２の効率特性曲線として、例えばガバナの開度１００％時の効率特性曲線を用いた場合を示したものである。自立運転時には、永久磁石同期発電機３の速度を最大発電出力速度ｎo以上の速度範囲内で運用し、最大発電出力速度ｎoと水車出力の発電エネルギーと特定負荷１６の消費エネルギーがバランスした速度ｎ１間で動作している。特定負荷１６が軽負荷の場合では発電機速度は水車の無拘束速度付近のｎ1となり、この状態から発電機制御インバータ７を連系運転の最大出力速度ｎ0の速度範囲で運転される。 FIG. 4 is a characteristic diagram of the water turbine, and shows a case where, for example, an efficiency characteristic curve when the governor opening degree is 100% is used as the efficiency characteristic curve of the water turbine 2. During the self-sustaining operation, the speed of the permanent magnet synchronous generator 3 is operated within the speed range equal to or higher than the maximum power generation output speed no, and the speed n1 is a balance between the maximum power generation output speed no, the power generation energy of the turbine output, and the energy consumption of the specific load 16. Is working between. When the specific load 16 is a light load, the generator speed is n 1 near the unrestricted speed of the water turbine, and from this state, the generator control inverter 7 is operated in the speed range of the maximum output speed n 0 of the interconnection operation.

なお、自立運転中に交流系統が複電すると、変圧器２１が系統母線側の開閉器２０の一次側と交流系統１９との間の電圧を複電信号として検出し制御装置２２に入力する。制御装置２２は、系統連系制御インバータ８に対しては直流電圧一定制御の連系制御モードへの切換の制御を行い、発電機制御インバータ７に対しては速度又はトルク制御への発電機制御モードへの切換制御を行うことで、自立運転から系統連系への切換制御が完了する。   When the AC system doubles power during the self-sustained operation, the transformer 21 detects the voltage between the primary side of the switch 20 on the system bus side and the AC system 19 as a double power signal and inputs it to the control device 22. The control device 22 controls the grid interconnection control inverter 8 to switch to the linkage control mode of constant DC voltage control, and the generator control inverter 7 performs generator control to speed or torque control. By performing the switching control to the mode, the switching control from the independent operation to the grid interconnection is completed.

したがって、この実施例によれば、連系運転から自立運転への切換が自動的に可能となり、これにより、人手を介することなく短時間での切換制御が出来るものである。   Therefore, according to this embodiment, switching from the interconnected operation to the independent operation can be automatically performed, and thus switching control can be performed in a short time without manual intervention.

図５は第２の実施例における切換時のタイミングチャートを示したものである。図３で示す実施例では、時刻ｔ４からの自立運転時の永久磁石同期発電機３の出力電圧はステップ状に立ち上がり、特定負荷１６に定格電圧が印加されるよう構成されているため、水力発電システムに突入電流が流れる虞が生じる。この実施例では、制御装置２２での制御信号生成回路にクッション処理機能を設け、時刻ｔ４の自立運転開始時に系統連系制御インバータ８の交流出力電圧がランプ状となるよう出力電圧指令値に時刻ｔ５までのクッション特性をもたせものである。これにより、水力発電システムでの突入電流を防止したものである。他は実施例１と同様である。   FIG. 5 shows a timing chart at the time of switching in the second embodiment. In the embodiment shown in FIG. 3, the output voltage of the permanent magnet synchronous generator 3 during the self-sustaining operation from the time t4 rises in a step shape, and the rated voltage is applied to the specific load 16. There is a risk that an inrush current flows in the system. In this embodiment, the control signal generation circuit in the control device 22 is provided with a cushion processing function, and the time is set at the output voltage command value so that the AC output voltage of the grid interconnection control inverter 8 becomes a ramp when the autonomous operation is started at time t4. It has cushion characteristics up to t5. This prevents inrush current in the hydroelectric power generation system. Others are the same as in the first embodiment.

１… 水車発電設備
３… 永久磁石同期発電機
６… コンバータ装置
７… 発電機制御インバータ
８… 系統連系制御インバータ
９… 制動ユニット
１０… 制動抵抗器
１… 水車発電設備
６… コンバータ装置
８… 系統連系制御インバータ
１５，２１… 変圧器
１２，２０… 開閉器
１８… 制御部
１９… 交流系統
２２… 制御装置 DESCRIPTION OF SYMBOLS 1 ... Turbine power generation equipment 3 ... Permanent magnet synchronous generator 6 ... Converter apparatus 7 ... Generator control inverter 8 ... Grid connection control inverter 9 ... Braking unit 10 ... Braking resistor 1 ... Turbine power generation equipment 6 ... Converter apparatus 8 ... System Interconnection control inverter 15, 21 ... Transformer 12, 20 ... Switch 18 ... Control unit 19 ... AC system 22 ... Control device

Claims (3)

水車と連結された永久磁石同期発電機を、発電機制御インバータおよび系統連系制御インバータを有するコンバータ装置に接続し、コンバータ装置及び開閉器を介して交流系統に接続し、コンバータ装置の上位の制御系として制御部を備えてコンバータ装置と制御部間での情報の授受を行い、且つ制御部により流量調節手段を調節して水車への流量を調節する水力発電システムであって、水力発電システムの自立運転時には、発電機制御インバータを直流電圧一定制御に、系統連系制御インバータを出力電圧一定制御する機能を備えた制御装置において、
前記コンバータ装置の直流回路に制動ユニットを介して制動抵抗を接続し、
前記制御装置は、前記交流系統における異常発生を検出する検出手段と、
前記検出手段による異常検出時に前記発電機制御インバータに対して直流電圧一定制御の自立運転モードに切換え、前記系統連系制御インバータに対してはゲートブロックすると共に、前記制動ユニットを介してコンバータ装置の直流回路に発生したエネルギーを制動抵抗により消費させる手段と、
自立運転への制御開始条件が成立したか否かを判断する判断手段と、
前記判断手段による自立運転への制御開始条件成立時に系統連系用の開閉器に対して閉路信号を出力し、前記系統連系制御インバータに対しては出力電圧一定制御に、前記発電機制御インバータに対しては直流電圧一定制御に運転モードを切換制御する手段、
を備えたことを特徴とした水力発電システムの運転切換装置。 The permanent magnet synchronous generator connected to the water turbine is connected to a converter device having a generator control inverter and a grid interconnection control inverter, and is connected to an AC system via the converter device and a switch. A hydroelectric power generation system that includes a control unit as a system, exchanges information between the converter device and the control unit, and adjusts the flow rate to the turbine by adjusting the flow rate adjusting means by the control unit. At the time of self-sustained operation, in the control device having the function of controlling the generator control inverter to DC voltage constant control and the grid connection control inverter to output voltage constant control,
A braking resistor is connected to the DC circuit of the converter device via a braking unit,
The control device includes detection means for detecting occurrence of abnormality in the AC system;
When an abnormality is detected by the detection means, the generator control inverter is switched to a self-sustained operation mode of constant DC voltage control, the grid interconnection control inverter is gate-blocked, and the converter unit is connected via the braking unit. Means for consuming the energy generated in the DC circuit by a braking resistor;
A judging means for judging whether or not a control start condition for autonomous operation is satisfied;
When the control start condition for the independent operation by the determination means is satisfied, a closing signal is output to the switch for grid connection, and the generator control inverter is set to a constant output voltage control for the grid connection control inverter. Means for switching and controlling the operation mode to DC voltage constant control,
An operation switching device for a hydroelectric power generation system, comprising: 前記判断手段は、前記交流系統の複電時に投入される開閉器が開放され、前記永久磁石同期発電機の速度が最大速度以上であることを条件に自立運転の制御開始条件の成立信号を出力することを特徴とした請求項１記載の水力発電システムの運転切換装置。 The determination means outputs a signal indicating establishment of a control start condition for self-sustained operation on condition that a switch that is turned on when the AC system is double-powered is opened and the speed of the permanent magnet synchronous generator is equal to or greater than a maximum speed. The operation switching device for a hydroelectric power generation system according to claim 1. 前記制御装置は、自立運転開始時に前記系統連系制御インバータの出力電圧がランプ状に出力するよう出力電圧指令値にクッション特性を持たせたことを特徴とした請求項１又は２記載の水力発電システムの運転切換装置。 3. The hydroelectric power generation according to claim 1, wherein the control device gives a cushion characteristic to the output voltage command value so that the output voltage of the grid interconnection control inverter is output in a ramp shape at the start of independent operation. 4. System operation switching device.
JP2015063553A 2015-03-26 2015-03-26 Operation switching device for hydroelectric power generation system Active JP6488814B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015063553A JP6488814B2 (en) 2015-03-26 2015-03-26 Operation switching device for hydroelectric power generation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015063553A JP6488814B2 (en) 2015-03-26 2015-03-26 Operation switching device for hydroelectric power generation system

Publications (2)

Publication Number Publication Date
JP2016185005A true JP2016185005A (en) 2016-10-20
JP6488814B2 JP6488814B2 (en) 2019-03-27

Family

ID=57242068

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2015063553A Active JP6488814B2 (en) 2015-03-26 2015-03-26 Operation switching device for hydroelectric power generation system

Country Status (1)

Country Link
JP (1) JP6488814B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106788015A (en) * 2016-12-16 2017-05-31 武汉理工大学 A kind of monitoring of electric machine controller dc bus power down and processing method
JP2018107859A (en) * 2016-12-22 2018-07-05 株式会社酉島製作所 Hydraulic turbine power generation system and control method for hydraulic turbine power generation system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003244996A (en) * 2002-02-18 2003-08-29 Kawasaki Heavy Ind Ltd Turbine generator
JP2009131056A (en) * 2007-11-22 2009-06-11 Aisin Seiki Co Ltd System-linkage power supply device with autonomous operation function
JP2013223324A (en) * 2012-04-16 2013-10-28 Torishima Pump Mfg Co Ltd Water wheel power generation system
JP2014158371A (en) * 2013-02-15 2014-08-28 Yaskawa Electric Corp Electric power system and electric power conversion system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003244996A (en) * 2002-02-18 2003-08-29 Kawasaki Heavy Ind Ltd Turbine generator
JP2009131056A (en) * 2007-11-22 2009-06-11 Aisin Seiki Co Ltd System-linkage power supply device with autonomous operation function
JP2013223324A (en) * 2012-04-16 2013-10-28 Torishima Pump Mfg Co Ltd Water wheel power generation system
JP2014158371A (en) * 2013-02-15 2014-08-28 Yaskawa Electric Corp Electric power system and electric power conversion system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106788015A (en) * 2016-12-16 2017-05-31 武汉理工大学 A kind of monitoring of electric machine controller dc bus power down and processing method
CN106788015B (en) * 2016-12-16 2019-04-26 武汉理工大学 A kind of monitoring and processing method of the power down of electric machine controller DC bus
JP2018107859A (en) * 2016-12-22 2018-07-05 株式会社酉島製作所 Hydraulic turbine power generation system and control method for hydraulic turbine power generation system

Also Published As

Publication number Publication date
JP6488814B2 (en) 2019-03-27

Similar Documents

Publication Publication Date Title
CA2914293C (en) Systems and methods for increasing wind turbine power output
JP5508796B2 (en) Power supply system control method and power supply system control apparatus
US9742260B2 (en) Inverter synchronization
JP5681785B2 (en) Power converter
JP6032745B2 (en) Power storage system
JP6010187B2 (en) Inverter instantaneous power failure compensation method
JP2006223060A (en) Parallel operation controller of power converter
JP2016185006A (en) Changeover device of hydraulic power generating system
CN109154275B (en) Operating a wind turbine generator during an abnormal grid event
KR20110026500A (en) Low voltage ride through
JP2018126014A (en) Power conversion device, power conversion system, and control method of power conversion device
JP2007244155A (en) Micro hydraulic power generator
JP6488814B2 (en) Operation switching device for hydroelectric power generation system
JP5123673B2 (en) Power converter
JP6916293B2 (en) Hydropower grid interconnection system
JP2017055468A (en) Water turbine acceleration suppression method and device therefor
KR20150005822A (en) Apparatus and method of controlling instant power failure of h-bridge multi-level inverter
JP2019004651A (en) System interconnection electric power conversion system
JP2010011677A (en) Power converting apparatus
JP2014023303A (en) Reverse power flow factor determination method and device for power distribution automatic voltage regulator
EP3410556B1 (en) Control method for protecting generators
CN102801383A (en) Alternating current motor driving device with charging function and charging method thereof
JP2011139594A (en) System interconnection system
JP6424639B2 (en) Stand-alone operation device of small hydropower variable speed power generation system
JP6591057B2 (en) Power conversion system for grid connection

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20180220

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20181206

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20181211

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20190121

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20190129

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20190211

R150 Certificate of patent or registration of utility model

Ref document number: 6488814

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150