JP4957099B2 - Power converter and control method thereof - Google Patents

Power converter and control method thereof Download PDF

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JP4957099B2
JP4957099B2 JP2006187349A JP2006187349A JP4957099B2 JP 4957099 B2 JP4957099 B2 JP 4957099B2 JP 2006187349 A JP2006187349 A JP 2006187349A JP 2006187349 A JP2006187349 A JP 2006187349A JP 4957099 B2 JP4957099 B2 JP 4957099B2
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修治 加藤
康弘 清藤
庄一郎 古関
智道 伊藤
基生 二見
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Hitachi Ltd
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本発明は、交流系統に連系する電力変換装置、特に負荷変動により生じる電圧変動を抑制する電力変換装置、もしくは系統電流の変動を抑制する電力変換装置に関する。   The present invention relates to a power converter connected to an AC system, and more particularly, to a power converter that suppresses voltage fluctuation caused by load fluctuation, or a power converter that suppresses fluctuation of system current.

系統に連系する負荷が変動すると、系統電流が変動して送電線や変圧器のインピーダンスにより発生する電圧降下が変動し、負荷の連系点において電圧変動(フリッカ)が発生する。   When the load connected to the grid fluctuates, the grid current fluctuates, the voltage drop generated by the impedance of the transmission line and the transformer fluctuates, and voltage fluctuation (flicker) occurs at the load linkage point.

フリッカを抑制するフリッカ抑制装置は、例えば特許第2675206号にて提案されている。   For example, Japanese Patent No. 2675206 proposes a flicker suppressing device that suppresses flicker.

上記装置は、負荷電流から有効電流と無効電流を算出し、ローパスフィルタを施すことで正相分を算出し、ハイパスフィルタを施すことで逆相分を算出する。検出した負荷電流と逆位相の電流を出力することで、系統から流入する電流の変動分をキャンセルし、それによりフリッカを抑制する。   The apparatus calculates an effective current and a reactive current from a load current, calculates a normal phase by applying a low pass filter, and calculates a reverse phase by applying a high pass filter. By outputting a current having a phase opposite to that of the detected load current, the fluctuation of the current flowing from the system is canceled, thereby suppressing the flicker.

特許第2675206号Japanese Patent No. 2675206

上記公知例では、有効電力のうち、高周波変動のみを抽出して、有効電力にて補償するので、低周波で変動する高調波成分等については補償効果が小さく、系統電流や連系点の電圧変動の補償効果も小さくなってしまう。   In the above known example, only high-frequency fluctuations are extracted from the active power and compensated with the active power. Therefore, the compensation effect is small for harmonic components that fluctuate at low frequencies, and the system current and the voltage at the interconnection point. The compensation effect for fluctuations is also reduced.

負荷に並列に接続した電力変換装置において、
系統に同期する基準正弦波を用いて負荷電流をフーリエ級数展開し、その係数を出力するフーリエ級数展開手段と、該フーリエ級数係数から負荷電流の正相有効基本波成分を算出する基本波成分算出手段を有し、
負荷電流から該基本波電流を差し引いた演算値を、該電力変換装置の電流指令とすればよい。
In the power converter connected in parallel to the load,
A Fourier series expansion means for expanding a load current using a reference sine wave synchronized with the system and outputting the coefficient, and a fundamental wave component calculation for calculating a positive phase effective fundamental wave component of the load current from the Fourier series coefficient Having means,
A calculated value obtained by subtracting the fundamental current from the load current may be used as the current command of the power converter.

フーリエ級数から正相基本波有効電流の振幅値を算出することにより、正相基本波有効電流成分のみを負荷電流から除いて、電流指令値を作成できるため、高調波の変動による電圧変動や系統電流の変動も低減することができる。   By calculating the amplitude value of the positive-phase fundamental active current from the Fourier series, the current command value can be created by removing only the positive-phase fundamental active current component from the load current. Current fluctuations can also be reduced.

以下、本発明の実施例を図面を用いて説明する。   Embodiments of the present invention will be described below with reference to the drawings.

本発明の第一実施例を、図1を用いて説明する。   A first embodiment of the present invention will be described with reference to FIG.

本発明の電力変換装置1は商用電力系統の交流系統200と負荷3と連系点201で接続される。図1では、交流系統200を交流電源2と系統インピーダンス7で表した。系統インピーダンス7は、送電線インピーダンスや変圧器インピーダンスを意味する。負荷3と交流系統200の連系点201では、負荷電流が変動すると系統インピーダンス7で発生する電圧降下幅が変動し、電圧変動が発生する。本発明の電力変換装置1は、負荷電流変動による系統電流変動・連系点の電圧変動を抑制・低減するものである。   The power converter 1 of the present invention is connected to an AC system 200 of a commercial power system, a load 3 and a connection point 201. In FIG. 1, the AC system 200 is represented by an AC power supply 2 and a system impedance 7. The system impedance 7 means a transmission line impedance or a transformer impedance. At the connection point 201 between the load 3 and the AC system 200, when the load current fluctuates, the voltage drop generated in the system impedance 7 fluctuates and voltage fluctuations occur. The power conversion device 1 of the present invention suppresses / reduces system current fluctuations and voltage fluctuations at interconnection points due to load current fluctuations.

本発明の電力変換装置1は主回路部と制御演算部100により構成される。主回路は
IGBTとダイオードにより構成される電力変換器4,フィルタリアクトル5,直流コンデンサ6により構成され、電力変換器4の交流出力端子はフィルタリアクトル5を介して交流系統に連系し、電力変換器4の直流出力端子には直流コンデンサ6が並列接続される。なお、フィルタリアクトル5はインピーダンスを有すればよく、トランスでも構わない。
The power conversion device 1 of the present invention includes a main circuit unit and a control calculation unit 100. The main circuit is composed of a power converter 4 composed of an IGBT and a diode, a filter reactor 5, and a DC capacitor 6. The AC output terminal of the power converter 4 is connected to the AC system via the filter reactor 5 to convert the power. A DC capacitor 6 is connected in parallel to the DC output terminal of the device 4. The filter reactor 5 only needs to have impedance, and may be a transformer.

電力変換装置1の制御演算部を制御演算部100として示した。電力変換装置は直流コンデンサ6の電圧を一定に保つ制御なども実施しているが、本発明の発明部分に直接関係しない制御ブロックは省略した。実際には、前記コンデンサ電圧一定制御の出力が図示した電流指令値300に加算されたものが、電力変換装置の電流指令値となる。また、電力変換器4は電流制御器123の指令に従い、PWM制御されるが、他の実施例も含めて、説明を割愛する。   The control calculation unit of the power conversion device 1 is shown as the control calculation unit 100. The power conversion apparatus also performs control to keep the voltage of the DC capacitor 6 constant, but omits control blocks not directly related to the inventive portion of the present invention. Actually, the output of the constant capacitor voltage control added to the illustrated current command value 300 is the current command value of the power converter. The power converter 4 is PWM-controlled in accordance with a command from the current controller 123, but the description is omitted including other embodiments.

電力変換装置1は、負荷電流を電流センサ20〜22で検出し、負荷電流検出値から系統電流変動を抑制するための電流指令値300を算出する。本発明では、負荷電流検出値から、基本波有効電流成分を算出し、負荷電流から差し引いた残りの電流値を電力変換装置の電流出力指令とする。   The power converter 1 detects the load current with the current sensors 20 to 22 and calculates a current command value 300 for suppressing system current fluctuation from the load current detection value. In the present invention, the fundamental active current component is calculated from the detected load current value, and the remaining current value subtracted from the load current is used as the current output command of the power converter.

具体的には、負荷電流検出値を3相/2相変換ブロック101により、2相電流ILαとILβに変換する。次に、連系点201の検出電圧を元に、θ演算ブロック52で電圧位相を演算し、θ演算ブロック52の出力する位相情報を元に正相DFT演算器107で正相DFT演算を行い、有効電力成分ILREを演算する。具体的には、正相DFT演算器107は数式1で示す演算により、負荷電流の正相実軸基本波成分振幅値IL1REと、正相虚軸基本波成分振幅値IL1IMを算出する。但し、位相θは検出点電圧の基本波成分を各々次のように表現したときの位相を示す。連系点201のU相電圧:Vu=
cos(θ) ,連系点201のV相電圧:Vv=cos(θ−2/3π) ,連系点201のW相電圧:Vw=cos(θ−4/3π) 。
Specifically, the load current detection value is converted into two-phase currents ILα and ILβ by the three-phase / two-phase conversion block 101. Next, the voltage phase is calculated by the θ calculation block 52 based on the detection voltage at the interconnection point 201, and the positive phase DFT calculation is performed by the positive phase DFT calculator 107 based on the phase information output from the θ calculation block 52. The active power component ILRE is calculated. Specifically, the positive phase DFT calculator 107 calculates the positive phase real axis fundamental wave component amplitude value IL1RE and the positive phase imaginary axis fundamental wave component amplitude value IL1IM of the load current by the calculation shown in Formula 1. However, the phase θ indicates the phase when the fundamental wave component of the detection point voltage is expressed as follows. U-phase voltage at interconnection point 201: Vu =
cos (θ), V-phase voltage at the connection point 201: Vv = cos (θ-2 / 3π), W-phase voltage at the connection point 201: Vw = cos (θ-4 / 3π).

Figure 0004957099
Figure 0004957099

ここで、tは現在の時刻、fsは連系する系統周波数、T=1/fsである。 Here, t is the current time, f s is the system frequency, which interconnects a T = 1 / f s.

数式1に示されるように、系統電圧と同期する正弦波との積を周期積分するため、系統周波数の整数倍の負荷電流成分、つまり高調波成分に対してはゲインが零となり、負荷電流の正相実軸基本波成分振幅値IL1REは正相有効基本波電流成分振幅値となる。演算した負荷電流の正相有効基本波電流成分振幅値IL1REを正相dq/αβ変換器108で交流成分に再変換して、負荷電流検出値から差し引くことにより、電力変換装置1の電流指令値300を作成する(図1では2相変換した負荷電流検出値から差し引いている。)。負荷電流から、正相有効基本波電流成分のみを差し引いた電流を補償する形で電力変換器装置1が動作するので、高調波電流の低周波変動成分を補償する電流成分も電流指令値300に含まれ、交流系統200の系統電流高調波の低周波変動成分や、連系点201の高調波電圧の低周波変動も補償することができる。   Since the product of the system voltage and the sine wave synchronized with the system voltage is periodically integrated as shown in Equation 1, the gain is zero for the load current component that is an integral multiple of the system frequency, that is, the harmonic component, and the load current The positive phase real-axis fundamental wave component amplitude value IL1RE becomes the positive phase effective fundamental wave component amplitude value. By converting the positive phase effective fundamental wave current component amplitude value IL1RE of the calculated load current into an AC component by the positive phase dq / αβ converter 108 and subtracting it from the load current detection value, the current command value of the power converter 1 is obtained. 300 is created (in FIG. 1, it is subtracted from the detected load current value after two-phase conversion). Since the power converter device 1 operates so as to compensate the current obtained by subtracting only the positive phase effective fundamental wave current component from the load current, the current component for compensating the low frequency fluctuation component of the harmonic current is also set to the current command value 300. In addition, the low frequency fluctuation component of the system current harmonic of the AC system 200 and the low frequency fluctuation of the harmonic voltage of the interconnection point 201 can be compensated.

第1の実施例では、負荷電流から正相有効基本波電流を差し引いて、電力変換装置1の電流指令値300を算出したが、第2の実施例では、負荷電流から、正相有効基本波電流のみではなく、正相無効電流振幅値の低周波成分(基本波周波数よりも十分に低い周波数成分)も差し引いて、電力変換装置1の電流指令値を作成する。   In the first embodiment, the current command value 300 of the power converter 1 is calculated by subtracting the positive phase effective fundamental wave current from the load current. However, in the second embodiment, the positive phase effective fundamental wave is calculated from the load current. The current command value of the power converter 1 is created by subtracting not only the current but also the low-frequency component (frequency component sufficiently lower than the fundamental frequency) of the positive-phase reactive current amplitude value.

例えば数Hz以上の比較的高周波域の変動補償が重要である場合は、無効電流振幅値の低周波成分の補償を小さくすることにより(例えば1Hz以下)、相対的に高周波変動に対する電力変換装置1の出力を大きくすることができる。   For example, when it is important to compensate for fluctuations in a relatively high frequency range of several Hz or more, the power conversion device 1 for relatively high frequency fluctuations is reduced by reducing the compensation of the low frequency component of the reactive current amplitude value (for example, 1 Hz or less). Output can be increased.

第2の実施例の電力変換装置の構成の主要部を図2に示す。電力変換装置は直流コンデンサ6の電圧を一定に保つ制御なども実施しているが、本発明の発明部分に直接関係しない制御ブロックは省略した。   The principal part of the structure of the power converter device of a 2nd Example is shown in FIG. The power conversion apparatus also performs control to keep the voltage of the DC capacitor 6 constant, but omits control blocks not directly related to the inventive portion of the present invention.

第1の実施例では、ILαとILβから正相有効基本波電流振幅値のみを算出したが、第2の実施例では、正相DFT演算器107は数式1で示す演算により、負荷電流の正相基本波有効電力成分振幅値IL1REと、正相虚軸成分振幅値IL1IM、すなわち正相基本波無効電流振幅値を出力する。   In the first embodiment, only the positive-phase effective fundamental wave current amplitude value is calculated from ILα and ILβ. However, in the second embodiment, the positive-phase DFT calculator 107 calculates the positive load current by the calculation shown in Equation 1. The phase fundamental wave active power component amplitude value IL1RE and the positive phase imaginary axis component amplitude value IL1IM, that is, the positive phase fundamental wave reactive current amplitude value are output.

次にローパスフィルタ120で、正相基本波無効電流振幅値から高周波成分を取り除く(例えば数Hz以上)。次に、高周波成分を取り除いた正相基本波無効電流振幅値と正相基本波有効電流振幅値を、正相dq/αβ演算器108で交流成分に戻し、負荷電流から差し引くことにより、電力変換装置1の電流指令値を算出する。   Next, the low-pass filter 120 removes a high frequency component from the positive phase fundamental wave reactive current amplitude value (for example, several Hz or more). Next, the positive-phase fundamental wave reactive current amplitude value and the positive-phase fundamental wave active current amplitude value from which the high-frequency component has been removed are returned to the AC component by the positive-phase dq / αβ calculator 108 and subtracted from the load current. The current command value of the device 1 is calculated.

正相基本波無効電流について高周波成分(数Hz以上)のみを補償するため、電力変換装置1の容量が小さくても、正相基本波無効成分の高周波変動成分(数Hz以上)をより多く補償することが可能になる。   Since only the high-frequency component (several Hz or more) is compensated for the positive-phase fundamental wave reactive current, the high-frequency fluctuation component (several Hz or more) of the positive-phase fundamental wave reactive component is compensated more even if the capacity of the power converter 1 is small. It becomes possible to do.

第2の実施例では、負荷電流から正相有効基本波電流と正相無効基本波電流の低周波変動成分を差し引いて、電力変換装置1の電流指令を算出したが、第3の実施例では、負荷電流から、正相有効基本波電流と正相無効基本波電流の低周波成分のみではなく、逆相電流の低周波成分も差し引いて、電力変換装置1の電流指令値を作成する。   In the second embodiment, the current command of the power converter 1 is calculated by subtracting the low-frequency fluctuation component of the positive-phase effective fundamental wave current and the positive-phase reactive fundamental wave current from the load current. However, in the third embodiment, The current command value of the power converter 1 is created by subtracting not only the low frequency components of the positive phase effective fundamental wave current and the positive phase invalid fundamental wave current but also the low frequency components of the negative phase current from the load current.

負荷3が不平衡負荷であり、数Hz以上の比較的高周波成分の変動補償が重要である場合は、逆相の低周波成分の補償を低減することにより、相対的に高周波変動に対する電力変換装置1の出力を大きくすることができる。   When the load 3 is an unbalanced load and it is important to compensate for fluctuations of a relatively high frequency component of several Hz or more, a power converter for relatively high frequency fluctuations is reduced by reducing the compensation of low-frequency components of opposite phase. The output of 1 can be increased.

第3の実施例の電力変換装置の構成の主要部を図3に示した。電力変換装置は直流コンデンサ6の電圧を一定に保つ制御なども実施しているが、本発明の発明部分に直接関係しない制御ブロックは省略した。   The main part of the structure of the power converter device of the 3rd Example was shown in FIG. The power conversion apparatus also performs control to keep the voltage of the DC capacitor 6 constant, but omits control blocks not directly related to the inventive portion of the present invention.

第2の実施例では、ILαとILβから正相DFT演算器107で正相有効基本波電流振幅値と正相無効基本波電流振幅値を算出したが、第3の実施例では、逆相DFT演算器109で逆相実軸成分振幅値IL2REと、逆相虚軸成分振幅値IL2IMを算出し、ローパスフィルタ120で低周波成分のみを取り出し、逆相dq/αβ演算ブロックで交流に戻した後に、負荷電流から差し引くことにより、電力変換装置1の電流指令値を作成する。   In the second embodiment, the positive phase effective fundamental wave current amplitude value and the positive phase invalid fundamental wave current amplitude value are calculated from the ILα and ILβ by the positive phase DFT calculator 107. In the third embodiment, the negative phase DFT current amplitude value is calculated. After computing the anti-phase real axis component amplitude value IL2RE and the anti-phase imaginary axis component amplitude value IL2IM by the computing unit 109, extracting only the low-frequency component by the low-pass filter 120, and returning to the alternating current by the anti-phase dq / αβ computation block The current command value of the power conversion device 1 is created by subtracting from the load current.

正相無効電流成分振幅値と逆相成分振幅値について高周波成分(数Hz以上)のみを補償するため、電力変換装置1の容量が小さくてもより多くの正相虚軸成分と逆相の高周波変動成分(数Hz以上)を補償することが可能になる。   Since only the high-frequency component (several Hz or more) is compensated for the positive-phase reactive current component amplitude value and the negative-phase component amplitude value, even if the capacity of the power converter 1 is small, the higher-phase imaginary axis component and the opposite-phase high frequency It is possible to compensate for fluctuation components (several Hz or more).

なお、逆相DFT演算器109は数式2で示す演算により、負荷電流の逆相実軸成分振幅値IL2REと、逆相虚軸成分振幅値IL2IMを算出する。   Note that the anti-phase DFT calculator 109 calculates the anti-phase real axis component amplitude value IL2RE and the anti-phase imaginary axis component amplitude value IL2IM of the load current by the calculation shown in Formula 2.

Figure 0004957099
Figure 0004957099

ここで、tは現在の時刻、fsは連系する系統周波数、T=1/fsである。 Here, t is the current time, f s is the system frequency, which interconnects a T = 1 / f s.

第4の実施例の構成の主要部を図4に示した。電力変換装置は直流コンデンサ6の電圧を一定に保つ制御なども実施しているが、本発明の発明部分に直接関係しない制御ブロックは省略した。   The main part of the configuration of the fourth embodiment is shown in FIG. The power conversion apparatus also performs control to keep the voltage of the DC capacitor 6 constant, but omits control blocks not directly related to the inventive portion of the present invention.

第4の実施例は、正相有効電流基本波成分振幅値に系統交流電源2の倍数の周波数のノッチフィルタ121を接続することを特徴とする。逆相基本波成分が変動すると、正相実軸成分振幅値の系統交流電源2の倍数の周波数の振動として現れる。そこで、逆相基本波成分の変動による干渉を防止するため、系統交流電源2の倍数の周波数のノッチフィルタ121で取り除いた後に、正相dq/αβ演算器108にて、交流成分に変換した後に、負荷電流成分から差し引いて、電流指令を作成する。逆相成分の干渉を防止できるので、確実に電力変換装置1の電流制御を実施できる。   The fourth embodiment is characterized in that a notch filter 121 having a frequency that is a multiple of the system AC power supply 2 is connected to the positive phase active current fundamental wave component amplitude value. When the negative phase fundamental wave component fluctuates, it appears as a vibration having a frequency that is a multiple of the system AC power supply 2 of the positive phase real axis component amplitude value. Therefore, in order to prevent interference due to fluctuations in the negative phase fundamental wave component, after being removed by the notch filter 121 having a frequency that is a multiple of the system AC power supply 2, the positive phase dq / αβ calculator 108 converts the AC component into an AC component. The current command is created by subtracting from the load current component. Since the interference of the negative phase component can be prevented, the current control of the power conversion device 1 can be performed with certainty.

第5の実施例の電力変換装置1の構成の主要部を図5に示した。電力変換装置は直流コンデンサ6の電圧を一定に保つ制御なども実施しているが、本発明の発明部分に直接関係しない制御ブロックは省略した。   The principal part of the structure of the power converter device 5 of the 5th Example was shown in FIG. The power conversion apparatus also performs control to keep the voltage of the DC capacitor 6 constant, but omits control blocks not directly related to the inventive portion of the present invention.

第5の実施例は、正相有効電流基本波成分振幅値に、ローパスフィルタ122を接続することを特徴とする。逆相基本波成分が変動すると、正相実軸成分振幅値に系統交流電源2の倍数の周波数の振動として現れる。そこで、逆相基本波成分の変動による干渉を防止するため、系統交流電源2の倍数の周波数の周波数成分をローパスフィルタで取り除いた後に、正相dq/αβ演算器108で交流成分に変換する。負荷電流成分から該変換値を差し引いて、電流指令を作成する。ローパスフィルタのカットオフ周波数は30Hz程度が好ましい。逆相成分の干渉を防止できるので、確実に電力変換装置1の電流制御を実施できる。   The fifth embodiment is characterized in that a low-pass filter 122 is connected to the positive-phase active current fundamental wave component amplitude value. When the negative phase fundamental wave component fluctuates, it appears as a vibration having a frequency that is a multiple of the system AC power supply 2 in the positive phase real axis component amplitude value. Therefore, in order to prevent interference due to fluctuations in the negative phase fundamental wave component, the frequency component having a frequency that is a multiple of the system AC power supply 2 is removed by a low-pass filter, and then converted into an AC component by the positive phase dq / αβ calculator 108. A current command is created by subtracting the converted value from the load current component. The cutoff frequency of the low pass filter is preferably about 30 Hz. Since the interference of the negative phase component can be prevented, the current control of the power conversion device 1 can be performed with certainty.

第6の実施例の電力変換装置1の構成の主要部を図6に示した。電力変換装置は直流コンデンサ6の電圧を一定に保つ制御なども実施しているが、本発明の発明部分に直接関係しない制御ブロックは省略した。   The main part of the configuration of the power conversion apparatus 1 of the sixth embodiment is shown in FIG. The power conversion apparatus also performs control to keep the voltage of the DC capacitor 6 constant, but omits control blocks not directly related to the inventive portion of the present invention.

第6の実施例は、実施例1乃至5の実施例に、電圧補償演算ブロック320を追加したことを特徴とする。電圧補償ブロック320では、連系点の電圧を3相2相変換ブロック101で、2相電圧として、正相DFT演算器107にて正相基本波有効電圧振幅値を算出。正相dq/αβ演算器108で交流に戻し、ゲイン演算器130vで実数倍した後に、電流補償演算ブロック310で決まる指令値とゲイン演算器130i(原則1以下、0でも可)との積算値と足し合わせて、電力変換装置1の電流指令値とする。ここで、ゲイン演算器130vのゲインは、フィルタリアクトルのインピーダンスの逆数値(電流値への変換)と電圧補償の寄与の程度(原則1以下、0でも可)を決めるゲインとの積とする。電圧補償ブロックを追加することにより、負荷3以外の原因によって発生する系統電流変動や連系点1の電圧変動を抑制できる。   The sixth embodiment is characterized in that a voltage compensation calculation block 320 is added to the first to fifth embodiments. In the voltage compensation block 320, the voltage at the connection point is converted into a two-phase voltage by the three-phase to two-phase conversion block 101, and the positive-phase fundamental wave effective voltage amplitude value is calculated by the positive-phase DFT calculator 107. The AC value is restored by the positive phase dq / αβ computing unit 108, multiplied by a real number by the gain computing unit 130v, and then the integrated value of the command value determined by the current compensation computing block 310 and the gain computing unit 130i (1 or less in principle, 0 is acceptable). And the current command value of the power converter 1 is added. Here, the gain of the gain calculator 130v is the product of the reciprocal value of the impedance of the filter reactor (conversion to current value) and the gain that determines the degree of contribution of voltage compensation (in principle, 1 or less, or 0). By adding the voltage compensation block, it is possible to suppress system current fluctuations caused by causes other than the load 3 and voltage fluctuations at the connection point 1.

なお、電圧補償ブロックの正相DFTの出力に、系統周波数の倍数の周波数のバンドパスフィルタやローパスフィルタを加えてもよい。   Note that a band pass filter or a low pass filter having a frequency that is a multiple of the system frequency may be added to the output of the positive phase DFT of the voltage compensation block.

さらに、電流補償演算ブロック310と同様に、正相DFT演算器107を用いて正相無効基本波電圧振幅値、逆相DFT演算器109を用いて、逆相基本波電圧振幅値を算出して、各振幅値の低周波成分のみを取り出して、正相基本波電圧振幅値から差し引いてもよい。   Further, similarly to the current compensation calculation block 310, the positive-phase invalid fundamental voltage amplitude value is calculated using the positive-phase DFT calculator 107, and the negative-phase fundamental voltage voltage amplitude value is calculated using the negative-phase DFT calculator 109. Alternatively, only the low frequency component of each amplitude value may be extracted and subtracted from the positive phase fundamental voltage amplitude value.

第7の実施例は、実施例1乃至6では負荷電流を検出しているのに対し、負荷電流の替わりに、系統電流を検出することを特徴とする。系統電流から電力変換装置1の指令値を作成することにより、負荷3以外の原因による系統電流変動や、連系点101の電圧変動を抑制することができる。   The seventh embodiment is characterized in that the load current is detected in the first to sixth embodiments, but the system current is detected instead of the load current. By creating a command value for the power converter 1 from the grid current, it is possible to suppress grid current fluctuations caused by causes other than the load 3 and voltage fluctuations at the interconnection point 101.

本発明は、負荷電流と逆位相の電流を出力することで連系点の電圧変動や系統電流変動を抑制し、電力品質の向上に貢献できる。   The present invention suppresses voltage fluctuations at the interconnection points and system current fluctuations by outputting a current having a phase opposite to that of the load current, and can contribute to improvement in power quality.

本発明の第一実施例の説明図。Explanatory drawing of the 1st Example of this invention. 本発明の第二実施例の説明図。Explanatory drawing of the 2nd Example of this invention. 本発明の第三実施例の説明図。Explanatory drawing of the 3rd Example of this invention. 本発明の第四実施例の説明図。Explanatory drawing of 4th Example of this invention. 本発明の第五実施例の説明図。Explanatory drawing of 5th Example of this invention. 本発明の第六実施例の説明図。Explanatory drawing of 6th Example of this invention.

符号の説明Explanation of symbols

1…電力変換装置、2…交流電源、3…負荷、4…電力変換器、5…フィルタリアクトル、6…直流コンデンサ、7…系統インピーダンス、10…電圧センサ、11,12,
13,20,21,22…電流センサ、100…制御演算部、102…位相演算器(θ演算器)、107…正相DFT演算器、108…正相dq/αβ演算器、109…逆相DFT演算器、110…逆相dq/αβ変換器、120,122…ローパスフィルタ、121…ノッチフィルタ、123…電流制御器、200…交流系統、201…連系点、300…電流指令値、310…電流補償演算ブロック、320…電圧補償演算ブロック。
DESCRIPTION OF SYMBOLS 1 ... Power converter device, 2 ... AC power supply, 3 ... Load, 4 ... Power converter, 5 ... Filter reactor, 6 ... DC capacitor, 7 ... System impedance, 10 ... Voltage sensor, 11, 12,
DESCRIPTION OF SYMBOLS 13, 20, 21, 22 ... Current sensor, 100 ... Control calculating part, 102 ... Phase calculator ((theta) calculator), 107 ... Normal phase DFT calculator, 108 ... Positive phase dq / (alpha) (beta) calculator, 109 ... Reverse phase DFT computing unit, 110 ... anti-phase dq / αβ converter, 120, 122 ... low-pass filter, 121 ... notch filter, 123 ... current controller, 200 ... AC system, 201 ... interconnection point, 300 ... current command value, 310 ... current compensation calculation block, 320 ... voltage compensation calculation block.

Claims (22)

変動負荷に並列に接続された電力変換装置において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流を算出し、負荷電流から該正相有効基本波電流を差し引いた電流値もしくは、該電流値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置。
In the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. To calculate the positive-phase effective fundamental wave current, and the current value obtained by subtracting the positive-phase effective fundamental wave current from the load current or the value obtained by adding the current value and the current command value of another control block Is a calculation function for setting the current command value of the power converter as a current command value.
変動負荷に並列に接続された電力変換装置において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流と正相無効基本波電流を算出し、負荷電流から該正相無効基本波電流の低周波変動成分と該正相有効基本波電流とを差し引いた電流値もしくは、該電流値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置。
In the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the are periodically integrating calculates the positive phase effective fundamental current and positive phase invalid fundamental current, by subtracting the low frequency fluctuation component of the positive phase invalid fundamental current and positive-phase effective fundamental current from the load current A power converter having an arithmetic function that uses a current value or a value obtained by adding the current value and a current command value of another control block as a current command value of the power converter.
変動負荷に並列に接続された電力変換装置において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流と正相無効基本波電流を算出し、また、負荷電流検出値の逆相成分について、フーリエ級数展開して、逆相基本波実軸電流と逆相基本波虚軸電流を算出して、負荷電流から、正相無効基本波電流と逆相基本波実軸電流と逆相基本波虚軸電流の低周波変動分と正相有効基本波電流を差し引いた電流値もしくは、該電流値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置。
In the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the are periodically integrating calculates the positive phase effective fundamental current and positive phase invalid fundamental current, also the anti-phase component of the load current detection value, and Fourier series expansion, inverse-phase fundamental real axis current and reverse The phase fundamental wave imaginary axis current is calculated, and the low-frequency fluctuation of the positive phase reactive fundamental wave current, the negative phase fundamental wave real axis current, the negative phase fundamental wave imaginary axis current, and the positive phase active fundamental current are calculated from the load current. A power converter having an arithmetic function that uses a subtracted current value or a value obtained by adding the current value and a current command value of another control block as a current command value of the power converter.
変動負荷に並列に接続された電力変換装置において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分し、正相有効基本波電流を算出して、該正相有効基本波電流から系統周波数の倍周波数成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置。
In the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. The current value obtained by subtracting the double frequency component of the system frequency from the positive phase effective fundamental wave current is subtracted from the load current, and the calculated value obtained as a result of subtraction or A power conversion device having a calculation function of using a value obtained by adding the calculated value and a current command value of another control block as a current command value of the power conversion device.
変動負荷に並列に接続された電力変換装置において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分し、正相有効基本波電流と正相無効基本波電流を算出して、負荷電流から該正相無効基本波電流の低周波変動成分と該正相有効基本波電流から系統周波数の倍周波数成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置。
In the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the periodically integrating positive phase effective fundamental current and calculates a positive phase invalid fundamental current, low frequency fluctuation component and system frequency from said positive phase effective fundamental current of the positive-phase invalid fundamental current from the load current Is obtained by subtracting the current value from which the double frequency component is removed from the load current and adding the calculated value obtained by subtracting the calculated current value and the current command value of the other control block. A power conversion device having a calculation function for setting a current command value.
変動負荷に並列に接続された電力変換装置において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流と正相無効基本波電流を算出し、また、負荷電流検出値の逆相成分について、フーリエ級数展開して、逆相実軸基本波電流と逆相虚軸基本波電流を算出して、負荷電流から、正相無効基本波電流と逆相実軸基本波電流と逆相虚軸基本波電流の低周波変動分と該正相有効基本波電流から系統周波数の倍周波数成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置。
In the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the are periodically integrating calculates the positive phase effective fundamental current and positive phase invalid fundamental current, also the anti-phase component of the load current detection value, and Fourier series expansion, inverse-phase real axis fundamental current and reverse The phase imaginary axis fundamental wave current is calculated, and from the load current, the positive phase reactive fundamental wave current, the negative phase real axis fundamental wave current, the low frequency fluctuation of the negative phase imaginary axis fundamental wave current, and the positive phase active fundamental wave current The current value obtained by subtracting the frequency component of the system frequency from the load current is subtracted from the load current, and the calculated value obtained by subtracting or the value obtained by adding the calculated value and the current command value of another control block is the power value. It has a calculation function to set the current command value of the converter Power converter for.
変動負荷に並列に接続された電力変換装置において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流を算出し、該正相有効基本波電流から高周波変動成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置。
In the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. To calculate a positive-phase effective fundamental wave current, subtract the high-frequency fluctuation component from the positive-phase effective fundamental wave current, subtract from the load current, or the calculated value obtained by subtracting or the calculated value And a current command value of another control block as a current command value of the power conversion device.
変動負荷に並列に接続された電力変換装置において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流と正相無効基本波電流を算出して、負荷電流から該正相無効基本波電流の低周波変動成分と該正相有効基本波電流から高周波変動成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置。
In the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the calculated positive-phase effective fundamental current and positive phase invalid fundamental current is periodically integrated, high-frequency wave from the low frequency fluctuation component of the positive phase invalid fundamental current and positive-phase effective fundamental current from the load current The current value from which the component is removed is subtracted from the load current, and the calculated value obtained as a result of subtraction or the sum of the calculated value and the current command value of another control block is the current command value of the power converter. A power conversion device characterized by having an arithmetic function.
変動負荷に並列に接続された電力変換装置において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流と正相無効基本波電流を算出し、また、負荷電流検出値の逆相成分について、フーリエ級数展開して、逆相実軸基本波電流と逆相虚軸基本波電流を算出して、負荷電流から、正相無効基本波電流と逆相実軸基本波電流逆相虚軸基本波電流それぞれの低周波変動分と該正相有効基本波電流から高周波変動成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置。
In the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the are periodically integrating calculates the positive phase effective fundamental current and positive phase invalid fundamental current, also the anti-phase component of the load current detection value, and Fourier series expansion, inverse-phase real axis fundamental current and reverse to calculate the phase imaginary axis fundamental current, from the load current, the positive phase and disabled fundamental current in opposite phase real axis fundamental current and the respective reverse-phase imaginary axis fundamental current low frequency variation, the positive phase effective basic The power value obtained by subtracting the current value obtained by removing the high frequency fluctuation component from the wave current and subtracting it from the load current, or the sum of the calculated value and the current command value of another control block is the power conversion. It has a calculation function to set the current command value of the device Power converter for.
請求項1乃至9のうちいずれか1つの機能を有する電力変換装置において、連系点電圧をフーリエ変換して正相有効基本波電圧を演算し、系統電圧から差し引き、差し引いた結果得られる演算値を変換器から連系点までのインピーダンスで除して、電流値に換算し、電流値に換算した値を実数倍した演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、請求項1乃至9の電流指令値と足し合わせた値を、電力変換器の電流指令値とすることを特徴とした電力変換装置。 In the power converter which has a function of any one of Claims 1 thru / or 9, a normal point effective fundamental wave voltage is calculated by Fourier-transforming a connection point voltage, it subtracts from a system voltage, and a calculation value obtained as a result of subtraction Is divided by the impedance from the converter to the connection point and converted into a current value, and the calculated value obtained by multiplying the converted value into a current value or the calculated value and the current command value of another control block are added. A power conversion device characterized in that a value obtained by adding the combined value to the current command value of claims 1 to 9 is used as a current command value for the power converter. 請求項1乃至10のうちいずれか1つの機能を有する電力変換装置において、負荷電流の替わりに系統電流を検出して、電力変換装置の電流指令値を演算する機能を有することを特徴とする電力変換装置。 A power converter having one of the functions of claims 1 to 10, wherein the power converter has a function of detecting a system current instead of a load current and calculating a current command value of the power converter. Conversion device. 変動負荷に並列に接続された電力変換装置の電流制御において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流を算出し、負荷電流から該正相有効基本波電流を差し引いた電流値もしくは、該電流値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置の制御方法。
In the current control of the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. To calculate the positive-phase effective fundamental wave current, and the current value obtained by subtracting the positive-phase effective fundamental wave current from the load current or the value obtained by adding the current value and the current command value of another control block The control method of the power converter, characterized in that it has a calculation function to make the current command value of the power converter.
変動負荷に並列に接続された電力変換装置の電流制御において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流と正相無効基本波電流を算出し、負荷電流から該正相無効基本波電流の低周波変動成分と該正相有効基本波電流とを差し引いた電流値もしくは、該電流値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置の制御方法。
In the current control of the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the are periodically integrating calculates the positive phase effective fundamental current and positive phase invalid fundamental current, by subtracting the low frequency fluctuation component of the positive phase invalid fundamental current and positive-phase effective fundamental current from the load current A control method for a power converter, characterized by having an arithmetic function that uses a current value or a value obtained by adding the current value and a current command value of another control block as a current command value of the power converter.
変動負荷に並列に接続された電力変換装置の電流制御において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流と正相無効基本波電流を算出し、また、負荷電流検出値の逆相成分について、フーリエ級数展開して、逆相基本波実軸電流と逆相基本波虚軸電流を算出して、負荷電流から、正相無効基本波電流と逆相基本波実軸電流と逆相基本波虚軸電流の低周波変動分と正相有効基本波電流を差し引いた電流値もしくは、該電流値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置の制御方法。
In the current control of the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the are periodically integrating calculates the positive phase effective fundamental current and positive phase invalid fundamental current, also the anti-phase component of the load current detection value, and Fourier series expansion, inverse-phase fundamental real axis current and reverse The phase fundamental wave imaginary axis current is calculated, and the low-frequency fluctuation of the positive phase reactive fundamental wave current, the negative phase fundamental wave real axis current, the negative phase fundamental wave imaginary axis current, and the positive phase active fundamental current are calculated from the load current. Control of a power converter having an arithmetic function that uses a subtracted current value or a value obtained by adding the current value and a current command value of another control block as a current command value of the power converter Method.
変動負荷に並列に接続された電力変換装置の電流制御において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分し、正相有効基本波電流を算出して、該正相有効基本波電流から系統周波数の倍周波数成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置の制御方法。
In the current control of the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. The current value obtained by subtracting the double frequency component of the system frequency from the positive phase effective fundamental wave current is subtracted from the load current, and the calculated value obtained as a result of subtraction or A control method for a power converter, characterized by having a calculation function that uses a value obtained by adding the calculated value and a current command value of another control block as a current command value of the power converter.
変動負荷に並列に接続された電力変換装置の電流制御において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分し、正相有効基本波電流と正相無効基本波電流を算出して、負荷電流から該正相無効基本波電流の低周波変動成分と該正相有効基本波電流から系統周波数の倍周波数成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置の制御方法。
In the current control of the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the periodically integrating positive phase effective fundamental current and calculates a positive phase invalid fundamental current, low frequency fluctuation component and system frequency from said positive phase effective fundamental current of the positive-phase invalid fundamental current from the load current Is obtained by subtracting the current value from which the double frequency component is removed from the load current and adding the calculated value obtained by subtracting the calculated current value and the current command value of the other control block. A control method for a power converter, characterized by having a calculation function for setting a current command value.
変動負荷に並列に接続された電力変換装置の電流制御において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流と正相無効基本波電流を算出し、また、負荷電流検出値の逆相成分について、フーリエ級数展開して、逆相実軸基本波電流と逆相虚軸基本波電流を算出して、負荷電流から、正相無効基本波電流と逆相実軸基本波電流と逆相虚軸基本波電流の低周波変動分と該正相有効基本波電流から系統周波数の倍周波数成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置の制御方法。
In the current control of the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the are periodically integrating calculates the positive phase effective fundamental current and positive phase invalid fundamental current, also the anti-phase component of the load current detection value, and Fourier series expansion, inverse-phase real axis fundamental current and reverse The phase imaginary axis fundamental wave current is calculated, and from the load current, the positive phase reactive fundamental wave current, the negative phase real axis fundamental wave current, the low frequency fluctuation of the negative phase imaginary axis fundamental wave current, and the positive phase active fundamental wave current The current value obtained by subtracting the frequency component of the system frequency from the load current is subtracted from the load current, and the calculated value obtained by subtracting or the value obtained by adding the calculated value and the current command value of another control block is the power value. It has a calculation function to set the current command value of the converter Control method for the electric power converter according to.
変動負荷に並列に接続された電力変換装置の電流制御において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流を算出し、該正相有効基本波電流から高周波変動成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置の制御方法。
In the current control of the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. To calculate a positive-phase effective fundamental wave current, subtract the high-frequency fluctuation component from the positive-phase effective fundamental wave current, subtract from the load current, or the calculated value obtained by subtracting or the calculated value A control method for a power converter, comprising a calculation function that uses a value obtained by adding the current command value of another control block and the current command value of the power converter.
変動負荷に並列に接続された電力変換装置の電流制御において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分し、正相有効基本波電流と正相無効基本波電流を算出して、負荷電流から該正相無効基本波電流の低周波変動成分と該正相有効基本波電流から高周波変動成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置の制御方法。
In the current control of the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the periodically integrating positive phase effective fundamental current and calculates a positive phase invalid fundamental current, high-frequency wave from the low frequency fluctuation component and positive-phase effective fundamental current of the positive-phase invalid fundamental current from the load current The current value from which the component is removed is subtracted from the load current, and the calculated value obtained as a result of subtraction or the sum of the calculated value and the current command value of another control block is the current command value of the power converter. The control method of the power converter device characterized by having an arithmetic function.
変動負荷に並列に接続された電力変換装置の電流制御において、
負荷電流を検出する電流検出器を有し、
負荷と系統との連系点電圧から系統の電圧位相を演算し、負荷電流検出値をフーリエ級数展開し、演算した前記電圧位相をもとに系統電圧と同期する正弦波と負荷電流との積を周期積分して正相有効基本波電流と正相無効基本波電流を算出し、また、負荷電流検出値の逆相成分について、フーリエ級数展開して、逆相実軸基本波電流と逆相虚軸基本波電流を算出して、負荷電流から、正相無効基本波電流と逆相実軸基本波電流逆相虚軸基本波電流それぞれの低周波変動分と該正相有効基本波電流から高周波変動成分を取り除いた電流値を、負荷電流から差し引き、差し引いた結果得られる演算値もしくは、該演算値と他の制御ブロックの電流指令値とを足し合わせた値を、該電力変換装置の電流指令値とする演算機能を有することを特徴とする電力変換装置の制御方法。
In the current control of the power converter connected in parallel to the variable load,
A current detector for detecting the load current;
The voltage phase of the system is calculated from the connection point voltage between the load and the system, the load current detection value is expanded in the Fourier series , and the product of the sine wave synchronized with the system voltage and the load current based on the calculated voltage phase. the are periodically integrating calculates the positive phase effective fundamental current and positive phase invalid fundamental current, also the anti-phase component of the load current detection value, and Fourier series expansion, inverse-phase real axis fundamental current and reverse to calculate the phase imaginary axis fundamental current, from the load current, the positive phase and disabled fundamental current in opposite phase real axis fundamental current and the respective reverse-phase imaginary axis fundamental current low frequency variation, the positive phase effective basic The power value obtained by subtracting the current value obtained by removing the high frequency fluctuation component from the wave current and subtracting it from the load current, or the sum of the calculated value and the current command value of another control block is the power conversion. It has a calculation function to set the current command value of the device Control method for the electric power converter according to.
請求項1乃至9のうちいずれか1つの機能を有する電力変換装置の電流制御において、連系点電圧をフーリエ変換して正相有効基本波電圧を演算し、系統電圧から差し引き、差し引いた結果得られる演算値を変換器から連系点までのインピーダンスで除して、電流値に換算し、電流値に換算した値を実数倍した演算値を、請求項1乃至9の電流指令値と足し合わせた値をもしくは前記値と他の制御ブロックの電流指令値との和の値を、電力変換器の電流指令値とすることを特徴とした電力変換装置の制御方法。 In the current control of the power conversion device having any one of the functions according to claim 1, the positive phase effective fundamental voltage is calculated by Fourier transforming the interconnection point voltage and subtracting from the system voltage, and the result obtained by subtraction is obtained. The calculated value obtained by dividing the calculated value by the impedance from the converter to the connection point is converted into a current value, and the calculated value obtained by multiplying the value converted into the current value by a real number is added to the current command value of claims 1 to 9. Or a sum of the value and the current command value of another control block is used as a current command value for the power converter. 請求項1乃至10のうちいずれか1つの機能を有する電力変換装置の電流制御において、負荷電流の替わりに系統電流を検出して、電力変換装置の電流指令値を演算する機能を有することを特徴とする電力変換装置の制御方法。 In the current control of the power converter having one of the functions of claims 1 to 10, it has a function of detecting a system current instead of a load current and calculating a current command value of the power converter. A method for controlling the power conversion device.
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