JP2007110894A - Electric power conversion system - Google Patents
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Abstract
Description
本発明は系統と連系し電力を吸収または放出する電力変換システムの及びその制御装置に関する。 The present invention relates to a power conversion system that is connected to a grid and absorbs or discharges power, and a control device therefor.
特開平10−248168号公報に記載の電力変換器の制御装置では、n次の電流源を系統に接続し、自家発電設備の単独運転時の系統インピーダンス変化を検出し、自家発電設備を解列する。 In the control device for a power converter described in Japanese Patent Laid-Open No. 10-248168, an n-th order current source is connected to the system, a change in system impedance during the independent operation of the private power generation facility is detected, and the private power generation facility is disconnected. To do.
上記のように、従来技術では、n次の電流源を設置しているため、連系用の電圧形インバータなどの分散電源を設置する場合、検出用の電流源と制御装置が別に必要となる。 As described above, since the n-th order current source is installed in the prior art, when a distributed power source such as a voltage source inverter for interconnection is installed, a current source for detection and a control device are separately required. .
本発明の目的は、電力変換器の単独運転を検出するに好適な電力変換システム及びその制御装置を提供することにある。 An object of the present invention is to provide a power conversion system suitable for detecting an isolated operation of a power converter and a control device therefor.
本発明による電力変換システムにおいては、電力変換器と電力系統が連系され、連系部における交流電圧または交流電流が検出される。検出された交流電圧または交流電流から、系統の周波数とは異なる周波数の周波数成分すなわち高調波成分が演算などにより求められる。単独運転のように電力変換器から系統に流入する電力が増えると、周波数成分の振幅が大きくなる。従って、周波数成分に基づいて、電力変換器の単独運転が検出できる。 In the power conversion system according to the present invention, the power converter and the power system are interconnected, and an AC voltage or an AC current in the interconnecting unit is detected. From the detected AC voltage or AC current, a frequency component having a frequency different from the frequency of the system, that is, a harmonic component, is obtained by calculation or the like. When the power flowing into the system from the power converter increases as in isolated operation, the amplitude of the frequency component increases. Therefore, the isolated operation of the power converter can be detected based on the frequency component.
周波数成分は、電力変換器の出力電圧を制御するための制御装置または制御方法によって演算などにより作成される出力電圧指令に、周波数成分の周波数の交流電圧指令を加算することにより得られる。また、周波数成分は、電力変換器が出力する高調波成分でもよい。このような周波数成分により、比較的簡単な制御装置または制御方法によって高精度に単独運転を検出することができる。 The frequency component is obtained by adding an alternating voltage command having a frequency component frequency to an output voltage command created by calculation or the like using a control device or a control method for controlling the output voltage of the power converter. Further, the frequency component may be a harmonic component output from the power converter. With such frequency components, it is possible to detect islanding with high accuracy by a relatively simple control device or control method.
本発明によれば、出力電圧指令に交流電圧指令を加算することによって電力変換器の出力電圧に重畳される周波数成分の大きさを検出している。また、電力変換器が出す高調波成分を検出する。従って、制御装置または制御方法を簡略化できる。 According to the present invention, the magnitude of the frequency component superimposed on the output voltage of the power converter is detected by adding the AC voltage command to the output voltage command. Moreover, the harmonic component which a power converter outputs is detected. Therefore, the control device or the control method can be simplified.
(実施例1)
以下本発明の第1の実施例である電力変換システムについて図1を用いて説明する。
Example 1
A power conversion system according to a first embodiment of the present invention will be described below with reference to FIG.
図1において、電力変換器は、連系用トランス3aに接続される。連系用トランス3aは遮断器1aを介して電力系統に接続されている。電力変換器の直流回路部分には2次電池4aが設置される。電力変換器は、2次電池に用いて、制御装置11aにより有効電力P・無効電力Qを連系用トランス3aを介して電力系統との間で吸収/放出する。
In FIG. 1, the power converter is connected to the interconnection transformer 3a. The interconnection transformer 3a is connected to the power system via the circuit breaker 1a. A
電力変換器の制御装置11aは系統に出力する有効電力P及び無効電力Qを電流検出器(電流検出手段)2bの出力(交流電流)と電圧検出器(電圧検出手段)5aの出力(交流電圧)から電力検出器により演算する。こうして得られた有効電力P,無効電力Qは有効電力調整器,無効電力調整器にそれぞれ入力され、有効電力調整器及び無効電力調整器にて、電力P及びQを指令値Pref,Qrefに一致させるように電流指令値Id*,Iq*を演算し電流調整器に出力する。 The control device 11a of the power converter converts the active power P and reactive power Q output to the system into the output (AC current) of the current detector (current detection means) 2b and the output (AC voltage) of the voltage detector (voltage detection means) 5a. ) From the power detector. The active power P and the reactive power Q thus obtained are input to the active power regulator and the reactive power regulator, respectively, and the powers P and Q are matched with the command values Pref and Qref by the active power regulator and the reactive power regulator. The current command values Id * and Iq * are calculated and output to the current regulator.
位相検出器は系統電圧の位相に追従した位相信号Vcos及びVsinを出力する。位相信号Vcos及びVsinは座標変換器に入力される。変換器の電流は電流検出器2aにより検出され、電流検出値Icnv は座標変換器により座標変換され、変換結果である2軸の電流検出値Id,Iqを電流調整器に入力する。電流調整器は電力変換器の電流を指令値Id*及び
Iq*に一致するように制御する。電流調整器の出力Vd*及びVq*は座標変換器に入力され、座標変換器は電圧指令値Vuo*,Vvo*,Vwo* を加算器15a,15b,15cに出力する。
The phase detector outputs phase signals Vcos and Vsin that follow the phase of the system voltage. The phase signals Vcos and Vsin are input to the coordinate converter. The current of the converter is detected by the current detector 2a, the current detection value Icnv is coordinate-converted by the coordinate converter, and the two-axis current detection values Id and Iq as the conversion results are input to the current regulator. The current regulator controls the current of the power converter so as to match the command values Id * and Iq *. Outputs Vd * and Vq * of the current regulator are input to the coordinate converter, and the coordinate converter outputs voltage command values Vuo *, Vvo *, and Vwo * to the
検出された連系点(連系部)電圧Vacはフィードフォワード(FF)電圧演算器に入力され、大きさを調整し、フィードフォワード電圧指令値Vuf,Vvf,Vwfを加算器15a,15b,15cに出力する。
The detected interconnection point (interconnection part) voltage Vac is input to a feedforward (FF) voltage calculator, the magnitude is adjusted, and feedforward voltage command values Vuf, Vvf, Vwf are added to
加算器15a,15b,15cは電圧指令値Vuo*,Vvo*,Vwo* と前記フィードフォワード電圧指令値Vuf,Vvf,Vwfの加算結果である電力変換器の電圧指令値(出力電圧指令)Vu*,Vv*,Vw*を加算器15d,15e,15fに出力する。
The
n次高調波電圧演算器は、n次の三相電圧指令値Vun,Vvn,Vwn(交流電圧指令)を演算し、加算器15d,15e,15fに出力する。 The n-order harmonic voltage calculator calculates n-order three-phase voltage command values Vun, Vvn, Vwn (AC voltage commands) and outputs them to adders 15d, 15e, 15f.
加算器15d,15e,15fは電圧指令値Vu*,Vv*,Vw*とn次の三相電圧指令値Vun,Vvn,Vwnの加算結果である電力変換器の電圧指令値Vu1,Vvl,Vw1をPWM演算器に出力し、PWM演算器は電力変換器の電圧指令値Vu1,Vvl,Vw1に基づいたゲートパルスGPを電力変換器に出力する。
The
電力変換器の電圧指令に重畳させるn次の周波数成分としては変換器が出力することなく、系統側にも含まれることの少ない次数として例えば偶数次を用いるとより精度が向上する。 The accuracy is further improved by using, for example, an even order as an order that is not included in the grid side without being output by the converter as an nth order frequency component to be superimposed on the voltage command of the power converter.
また、連系トランスにデルタ巻線を有する場合には3の倍数調波は系統に流出しないので、電圧指令値に重畳させるn次成分として3の倍数調波以外を用いる。 Further, when the interconnection transformer has a delta winding, multiple harmonics of 3 do not flow out to the system, and therefore, other than multiple harmonics of 3 are used as the n-order component to be superimposed on the voltage command value.
また、連系点電圧検出器の出力は、n次高調波検出器14aに入力され、n次高調波検出器14aにより電圧振幅を演算し、振幅の急変または増減により単独運転を検出し、電力変換装置を系統から切り離すため遮断器1aを動作させる信号Saを出力する。 The output of the interconnection point voltage detector is input to the nth-order harmonic detector 14a, the voltage amplitude is calculated by the nth-order harmonic detector 14a, and the isolated operation is detected by sudden change or increase / decrease in the amplitude. A signal Sa for operating the circuit breaker 1a is output to disconnect the conversion device from the system.
図2は、図1におけるn次高調波検出器14aの構成を詳細に示している。検出された連系点の電圧検出値Vacを3相2相変換器に入力し、3相2相変換器は対称座標法により正相分と逆相分の電圧成分をそれぞれ演算しVa,Vbを出力する。 FIG. 2 shows the configuration of the nth-order harmonic detector 14a in FIG. 1 in detail. The detected voltage detection value Vac at the connection point is input to the three-phase two-phase converter, and the three-phase two-phase converter calculates the voltage components for the positive phase and the reverse phase by the symmetric coordinate method, Va and Vb, respectively. Is output.
電圧成分Va及びVbは基本波演算手段と加算器15g,15hのそれぞれに入力される。該基本波演算手段は、入力された信号Va,Vbの基本波成分VaR,VbR(電源周波数成分)をフーリエ変換により検出して加算器に出力する。
The voltage components Va and Vb are input to the fundamental wave calculation means and the
加算器15g,15hは、3相2相変換器の出力Va及びVbから、基本波演算手段の出力VaR,VbRを減算した結果であるVaS,VbSをn次高調波成分検出器に出力する。n次高調波成分検出器は、入力された信号Vas,Vbsにn次成分を基準とするフーリエ変換を行い、n次の成分VaN,VbNを検出し、振幅演算器に出力する。振幅演算器はVaNとVbNの二乗和ルートを演算してn次の電圧振幅値Vnをレベル判定器10aに出力する。レベル判定器10aはn次の電圧振幅Vnが所定の値以上になった場合または以下になった場合に単独運転と判定し、システムを系統から切り離し停止させる。
The
レベル判定器10aの設定レベルは運転開始時の値をあらかじめ検出してこれを記憶しておき、これを基準として上下数%に設定する。 As the set level of the level determination device 10a, the value at the start of operation is detected in advance and stored, and this is set to several percent on the basis of this.
また、VaS,VbSの二乗和ルートにより求まる全ての高調波電圧の歪みの大きさの値から単独運転を検出しても良い。 Further, the isolated operation may be detected from the values of the distortion magnitudes of all the harmonic voltages obtained by the square sum route of VaS and VbS.
図3は、系統の電源Vsoと、系統の線路インピーダンスZ2及び電力変換器システムと連系点までのインピーダンスZ1及び負荷Z3が接続されている回路を示す。電力変換器システムは単独運転検出のためn次電圧Vnを重畳させている。このときのn次電圧のみに着目した場合、系統の電源Vsoは短絡して考えてよく、システムの連系点の電圧Vn′は、Z1による電圧降下分低下し、式(数1)で表される。 FIG. 3 shows a circuit in which the power supply Vso of the system, the line impedance Z2 of the system, the impedance Z1 up to the connection point with the power converter system, and the load Z3 are connected. The power converter system superimposes the n-th order voltage Vn for detecting an isolated operation. If attention is paid only to the n-th order voltage at this time, the power supply Vso of the system may be considered to be short-circuited, and the voltage Vn ′ at the connection point of the system decreases by the voltage drop due to Z1, and is expressed by the equation (Equation 1) Is done.
一般に電力系統の容量に比べ、電力変換器と二次電池を有する電力貯蔵システムの容量は小さく、従ってZ2はZ1に比べると小さな値になる。また、単独運転が成立するような条件ではZ3はZ2にくらべ大きな値となる。従って式(数2)及び式(数3)が成立する。
(数2)
|Z2|≪|Z1| …(数2)
(数3)
|Z3|≫|Z2| …(数3)
従って、式(数3)より式(数4)を得る。
Generally, the capacity of a power storage system having a power converter and a secondary battery is small compared to the capacity of the power system, and therefore Z2 is a small value compared to Z1. Moreover, Z3 becomes a large value compared with Z2 on the conditions that independent operation is materialized. Therefore, Expression (Equation 2) and Expression (Equation 3) hold.
(Equation 2)
| Z2 | << | Z1 | (Formula 2)
(Equation 3)
| Z3 | >> | Z2 | (Equation 3)
Therefore, Expression (Expression 4) is obtained from Expression (Expression 3).
さらに、式(数2)より式(数5)を得る。 Further, Expression (Formula 5) is obtained from Expression (Formula 2).
従って連系点におけるn次電圧はほぼ零になる。 Therefore, the n-th order voltage at the interconnection point is almost zero.
次に電力系統が切り離された状態を考えてみると、図3においてスイッチSWが開放された状態の回路となり、電力貯蔵システムは負荷に電力を供給し、単独運転状態に陥る。このとき系統のインピーダンスはZ2が無くなったため、例えばシステム容量と同等の負荷Zが接続されていると100%インピーダンスが接続されたことになり、単独運転前と比べシステムから見たインピーダンスは大きくなる。従って連系点で観測されるn次電圧Vn′は式(数6)により表される。 Next, when considering a state in which the power system is disconnected, a circuit in which the switch SW is opened in FIG. 3 is formed, and the power storage system supplies power to the load and enters a single operation state. At this time, since the impedance of the system is no longer Z2, for example, when a load Z equivalent to the system capacity is connected, 100% impedance is connected, and the impedance viewed from the system is larger than before the single operation. Therefore, the n-order voltage Vn ′ observed at the interconnection point is expressed by the equation (Equation 6).
Z1はトランスの漏れ分と、システム内部のインピーダンスの合計で、例えば15%程度であるとして上式(数6)に代入してVn′を計算してみると、Vn′=0.87Vn となる。 Assuming that Z1 is the sum of the transformer leakage and the internal impedance of the system and is about 15%, for example, Vn ′ is calculated by substituting into the above equation (Equation 6), Vn ′ = 0.87 Vn. .
このように単独運転になった際に連系点のn次電圧は大きく変わり、その変化を容易にとらえることができる。 Thus, when it becomes independent operation, the nth-order voltage of a connection point changes a lot, and the change can be caught easily.
また、単独運転の検出にはn次の電流を用いても良い。但し、重畳するn次電圧の周波数を電流制御の応答と比較し、応答よりも高い次数を用いれば、n次電流の大きさは電流制御系で抑制されにくく単独運転移行前後の変化が大きく検出精度が向上する。 In addition, an n-th order current may be used for detecting an isolated operation. However, if the frequency of the superimposed n-order voltage is compared with the current control response and a higher order than the response is used, the magnitude of the n-order current is difficult to be suppressed by the current control system, and the change before and after the single operation transition is detected greatly. Accuracy is improved.
本実施例では、単独運転の判定にレベル判定を用いて説明してきたが、変化率により単独運転を検出しても良い。 In the present embodiment, the level determination is used for the determination of the isolated operation, but the isolated operation may be detected based on the rate of change.
また、本実施例では、常時n次電圧を加算する方式で説明してきたが、時間パターンを用いて例えば100msに1回n次電圧を重畳して単独運転を検出しても良い。この場合、複数台の変換器システムに個別にパターンを設定することで誤検出を防止できる。 In the present embodiment, the method of always adding the n-th order voltage has been described. However, the isolated operation may be detected by superimposing the n-th order voltage once in 100 ms, for example, using a time pattern. In this case, erroneous detection can be prevented by individually setting patterns for a plurality of converter systems.
また、停止中の高調波スペクトルを検出し、検出結果から高調波が小さい次数を自動選択して、運転中に高調波が小さい次数を電圧指令値に加算すると検出精度が向上できる。 Further, detection accuracy can be improved by detecting a harmonic spectrum that is stopped, automatically selecting an order having a small harmonic from the detection result, and adding the order having a small harmonic during operation to the voltage command value.
また、運転中のn次高調波振幅検出値を用いて、電圧指令値に加算するn次高調波の振幅値を自動調整することで複数台設置した場合の系統に与える電圧高調波の影響を小さくできる。 In addition, using the detected n-th order harmonic amplitude detection value during operation, the amplitude value of the n-th order harmonic added to the voltage command value is automatically adjusted to affect the effect of voltage harmonics on the system when multiple units are installed. Can be small.
本実施例によれば、変換器の出力電圧にn次の高調波電圧成分を重畳させ、システムが出力しているn次の電圧成分の大きさを検出しているため、系統インピーダンスの変化がn次電圧に与える影響を利用して、その変化から単独運転状態を検出でき、システムを安全に停止させることができる。 According to this embodiment, since the nth-order harmonic voltage component is superimposed on the output voltage of the converter and the magnitude of the nth-order voltage component output by the system is detected, the change in system impedance is By utilizing the influence on the n-order voltage, the isolated operation state can be detected from the change, and the system can be stopped safely.
(実施例2)
次に、本発明の他の実施例を説明する。なお、各図を通して同等の構成要素には同一の符号を付して、詳細な説明は省略することにする。
(Example 2)
Next, another embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to an equivalent component through each figure, and detailed description is abbreviate | omitted.
図4は、本発明による電力変換システムの第2の実施例である。 FIG. 4 is a second embodiment of the power conversion system according to the present invention.
この実施例では、第1の実施例のn次電圧指令値の加算をなくした構成としている。 In this embodiment, the addition of the n-order voltage command value in the first embodiment is eliminated.
本実施の形態によれば、第1の実施例と同様のn次電圧検出方法により電力変換器が原理的に出力する高調波成分(たとえば5次や7次)を利用して単独運転を検出できるので制御の構成を簡略化できる。 According to the present embodiment, the isolated operation is detected using the harmonic component (for example, the 5th and 7th orders) output in principle by the power converter using the same nth-order voltage detection method as in the first embodiment. This makes it possible to simplify the control configuration.
(実施例3)
図5は、本発明による電力変換システムの第3の実施例である。
(Example 3)
FIG. 5 shows a third embodiment of the power conversion system according to the present invention.
この実施例では、第2の実施例のn次電圧振幅検出器にn次電流振幅検出器を加えた構成としている。 In this embodiment, an n-order current amplitude detector is added to the n-order voltage amplitude detector of the second embodiment.
図6は、n次電圧・電流振幅検出器100aの構成を示している。第1の実施例で説明したn次電圧振幅検出器の入力を電流とすることで、n次電流振幅検出が可能となる。n次電流振幅の変化とn次の電圧振幅の変化のどちらかが設定値を越えたとき、単独運転を検出し、遮断器開の指令を出力する。また、単独運転の判定には、振幅の変化率を用いてもよい。
FIG. 6 shows the configuration of the nth-order voltage /
また、電流と電圧よりインピーダンスを演算し、演算したインピーダンスの変化より単独運転を判定しても良い。 Alternatively, the impedance may be calculated from the current and voltage, and the single operation may be determined from the change in the calculated impedance.
本実施例によれば、第1または第2の実施例と同等の効果に加え、n次の電流からも単独運転状態を検出できるので、より確実に検出可能となる。 According to the present embodiment, in addition to the same effects as those of the first or second embodiment, the isolated operation state can be detected from the nth-order current, so that it can be detected more reliably.
ここでは主に第2の実施例の制御装置及び制御方法に適用した場合について説明したが、他の実施例で説明した制御装置及び制御方法を用いてもよい。 Although the case where the present invention is mainly applied to the control device and the control method of the second embodiment has been described here, the control device and the control method described in other embodiments may be used.
(実施例4)
図7は、第2の実施例の2次電池4aを用いた電力貯蔵用変換器に、無効電力補償装置(SVC)を適用した場合の実施例である。無効電力補償装置の電力変換器の直流部分にはコンデンサ6が設置されており、無効電力補償装置は制御装置11fからの指令により無効電力を系統とやりとりする。
Example 4
FIG. 7 shows an embodiment in which a reactive power compensator (SVC) is applied to the power storage converter using the
本実施例では、SVCを含む発電機器の単独運転を防止することが可能になる。 In the present embodiment, it becomes possible to prevent a single operation of the power generating device including the SVC.
また、図8に示すような、太陽光発電装置も適用できる。太陽光発電装置の、電力変換器の直流部分には太陽電池パネル7が設置されており、制御装置11cからの指令により電力を系統へ放出する。
Moreover, a solar power generation device as shown in FIG. 8 is also applicable. The solar cell panel 7 is installed in the direct current portion of the power converter of the solar power generation device, and the power is released to the system by a command from the
また、図9に示すような、超電導電力貯蔵装置も適用できる。超電導電力貯蔵装置の、電力変換器の直流部分には超電導コイル8が設置されており、制御装置11dからの指令により電力を系統から吸収あるいは系統へ放出する。 A superconducting power storage device as shown in FIG. 9 can also be applied. A superconducting coil 8 is installed in the DC portion of the power converter of the superconducting power storage device, and power is absorbed from the system or released to the system in response to a command from the control device 11d.
また、図10に示すような、風力発電装置も適用できる。風力発電装置の出力は、電力変換器により一旦直流に変換され、電力変換器により系統へ電力を供給する。 A wind power generator as shown in FIG. 10 can also be applied. The output of the wind turbine generator is once converted into direct current by the power converter, and power is supplied to the system by the power converter.
ここでは主に第2の実施例の制御装置及び制御方法に適用した場合について説明したが、他の実施例で説明した制御装置及び制御方法に用いてもよい。 Although the case where the present invention is mainly applied to the control device and the control method of the second embodiment has been described here, the present invention may be used for the control device and the control method described in other embodiments.
1a,1b,1c,1d,1e,1f…遮断器、2a,2b,2c,2d,2e,2f,2g,2h,2i,2j,2k,2l…電流検出器、3a,3b,3c,3d,3e,3f…連系用トランス、4a,4b…2次電池、5a,5b,5c,5d,5e,5f…電圧検出器、6…コンデンサ、7…太陽電池、8…超伝導コイル、9…風力発電機、10a…レベル判定器、11a,11b,11c,11d,11e,11f…電力変換器制御装置、14a,14b,14c,14d,14e,14f,100a…n次電圧検出器、15a,15b,15c,15d,15e,15f,15g,15h,15i,15j,15k,15l,15m,15n,15o,15p,15q,15r,15s,15t,15u,15v,15w…加算器、Iac…連系点電流検出値、Vac…連系点電圧検出値、Icnv…変換器電流検出値、Pref…有効電力指令値、Qref…無効電力指令値、P…有効電力、Q…無効電力、Id*…有効分電流指令値、Iq*…無効分電流指令値、Id…有効分電流検出値、Iq…無効分電流検出値、Vcos,Vsin…位相信号、Vd*…有効分電流指令値、
Vq*…無効分電流指令値、Vuo*,Vvo*,Vwo*…電圧指令値、Vuf,Vvf,Vwf…フィードフォワード電圧指令値、Vun,Vvn,Vwn…n次電圧指令値、Vu*,Vv*,Vw*,Vu1,Vvl,Vw1…変換器出力電圧指令値、GP…ゲートパルス、Vdc…直流電圧検出値、Vdcref …直流電圧指令値、Sa…遮断器動作信号、Va…電圧α成分、Vb…電圧β成分、VaR…電圧α成分の基本波成分、VbR…電圧β成分の基本波成分、VaS…高調波電圧α成分、VbS…高調波電圧β成分、VaN…n次高調波電圧α成分、VbN…n次高調波電圧β成分、Vn…n次電圧振幅、Vso…系統電圧。
1a, 1b, 1c, 1d, 1e, 1f ... circuit breaker, 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i, 2j, 2k, 2l ... current detector, 3a, 3b, 3c, 3d , 3e, 3f ... interconnection transformer, 4a, 4b ... secondary battery, 5a, 5b, 5c, 5d, 5e, 5f ... voltage detector, 6 ... capacitor, 7 ... solar cell, 8 ... superconducting coil, 9 ... wind power generator, 10a ... level judgment unit, 11a, 11b, 11c, 11d, 11e, 11f ... power converter control device, 14a, 14b, 14c, 14d, 14e, 14f, 100a ... n-order voltage detector, 15a , 15b, 15c, 15d, 15e, 15f, 15g, 15h, 15i, 15j, 15k, 15l, 15m, 15n, 15o, 15p, 15q, 15r, 15s, 15t, 15u, 15v, 15w ... adder, Iac Link point current detection value, Vac ... Link point voltage detection value, Icnv ... Converter current detection value, Pref ... Active power command value, Qref ... Reactive power command value, P ... Active power, Q ... Reactive power, Id * ... active current command value, Iq * ... reactive current command value, Id ... active current detection value, Iq ... reactive current detection value, Vcos, Vsin ... phase signal, Vd * ... active current command value,
Vq * ... reactive current command value, Vuo *, Vvo *, Vwo * ... voltage command value, Vuf, Vvf, Vwf ... feedforward voltage command value, Vun, Vvn, Vwn ... n-order voltage command value, Vu *, Vv *, Vw *, Vu1, Vvl, Vw1 ... Converter output voltage command value, GP ... Gate pulse, Vdc ... DC voltage detection value, Vdcref ... DC voltage command value, Sa ... Circuit breaker operation signal, Va ... Voltage α component, Vb: Voltage β component, VaR: Fundamental wave component of voltage α component, VbR: Fundamental wave component of voltage β component, VaS: Harmonic voltage α component, VbS: Harmonic voltage β component, VaN: nth harmonic voltage α Component, VbN: n-order harmonic voltage β component, Vn: n-order voltage amplitude, Vso: system voltage.
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Cited By (4)
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WO2008132889A1 (en) | 2007-04-19 | 2008-11-06 | Nec Corporation | Communication apparatus, communication control method, and communication control program |
JP2012085384A (en) * | 2010-10-07 | 2012-04-26 | Tabuchi Electric Co Ltd | Individual operation detection method, power conditioner, and distributed power supply system |
JP2016103902A (en) * | 2014-11-28 | 2016-06-02 | 株式会社日立製作所 | Power conversion device and control method therefor |
KR20220169627A (en) * | 2021-06-21 | 2022-12-28 | 한국전력공사 | Apparatus for controlling power output of distributed generations |
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JP4706361B2 (en) * | 2005-07-11 | 2011-06-22 | 株式会社明電舎 | System stabilization device |
JP4673174B2 (en) * | 2005-09-22 | 2011-04-20 | 東芝三菱電機産業システム株式会社 | Semiconductor switch control device |
JP4769222B2 (en) * | 2007-04-03 | 2011-09-07 | 関西電力株式会社 | Isolated operation detection method and isolated operation detection device |
DK2104220T3 (en) * | 2008-03-19 | 2010-03-22 | Abb Schweiz Ag | Method for operating a converter circuit and device for carrying out the method |
JP5705606B2 (en) * | 2011-03-23 | 2015-04-22 | 関西電力株式会社 | Voltage rise suppression device and distributed power interconnection system |
JP5793393B2 (en) * | 2011-10-18 | 2015-10-14 | 株式会社ダイヘン | Isolated operation detection device, grid-connected inverter system, and isolated operation detection method |
JP7055998B2 (en) * | 2017-03-03 | 2022-04-19 | 富士電機株式会社 | Static VAR compensator and control method of the device |
JP6783826B2 (en) * | 2018-07-11 | 2020-11-11 | 愛知電機株式会社 | Self-excited reactive power compensator |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2008132889A1 (en) | 2007-04-19 | 2008-11-06 | Nec Corporation | Communication apparatus, communication control method, and communication control program |
JP2012085384A (en) * | 2010-10-07 | 2012-04-26 | Tabuchi Electric Co Ltd | Individual operation detection method, power conditioner, and distributed power supply system |
JP2016103902A (en) * | 2014-11-28 | 2016-06-02 | 株式会社日立製作所 | Power conversion device and control method therefor |
KR20220169627A (en) * | 2021-06-21 | 2022-12-28 | 한국전력공사 | Apparatus for controlling power output of distributed generations |
KR102555106B1 (en) * | 2021-06-21 | 2023-07-18 | 한국전력공사 | Apparatus for controlling power output of distributed generations |
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