JP2016039738A - Parallel connection system of three-level power conversion device - Google Patents

Parallel connection system of three-level power conversion device Download PDF

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JP2016039738A
JP2016039738A JP2014163267A JP2014163267A JP2016039738A JP 2016039738 A JP2016039738 A JP 2016039738A JP 2014163267 A JP2014163267 A JP 2014163267A JP 2014163267 A JP2014163267 A JP 2014163267A JP 2016039738 A JP2016039738 A JP 2016039738A
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JP6318965B2 (en
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貴義 井上
Takayoshi Inoue
貴義 井上
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To control neutral point potential and suppress deterioration in the quality of a system due to increase in reactive power.SOLUTION: In the case where DC voltage deviation exceeds a threshold, when the number of units 5 is 2N, a reactive power command with delay polarity is overlapped with the N units 5 and a reactive power command with progressive polarity is overlapped with the other N units 5. When the number of units 5 is 2N+1, the reactive power command with delay polarity is overlapped with the N+1 units 5 and the reactive power command with progressive polarity is overlapped with the other N units 5, or the reactive power command with delay polarity is overlapped with the N units 5 and the reactive power command with progressive polarity is overlapped with the other N+1 units 5.SELECTED DRAWING: Figure 2

Description

本発明は、系統に連系された３レベル電力変換装置の並列接続システムに係り、特に、各々の３レベル電力変換装置における直流リンク電圧の中性点電位を安定化させる方法に関する。   The present invention relates to a parallel connection system of three-level power converters connected to a grid, and more particularly to a method for stabilizing a neutral point potential of a DC link voltage in each three-level power converter.

３レベル電力変換装置における直流リンク電圧の中性点電位を制御する方式については、電圧指令に印加する零相電圧として偶数次高調波を加算し、中性点電位を制御する方法が特許文献１に記載されている。特許文献１では、インバータ電流から零相電圧を生成するため、軽負荷（特に無負荷）においては中性点電位を制御させる操作量が小さくなり、中性点電位が安定せずインバータの動作が不安定になる場合がある。   As a method for controlling the neutral point potential of the DC link voltage in the three-level power converter, Patent Document 1 discloses a method of adding the even-order harmonics as the zero-phase voltage applied to the voltage command and controlling the neutral point potential. It is described in. In Patent Document 1, since the zero-phase voltage is generated from the inverter current, the amount of operation for controlling the neutral point potential is small at a light load (especially no load), the neutral point potential is not stabilized, and the inverter operates. May become unstable.

そこで中性点電位の変動が閾値を超過した場合、系統に対して適当な無効電力を重畳することにより、中性点電位制御の入力信号である電流量を増やし電圧指令に印加する零相電圧を増加させ中性点電位を安定化させることが可能である。   Therefore, when the fluctuation of the neutral point potential exceeds the threshold value, the zero-phase voltage applied to the voltage command is increased by increasing the amount of current that is the input signal for neutral point potential control by superimposing appropriate reactive power on the system. Can be increased to stabilize the neutral point potential.

特開平０７−０７９５７４号公報Japanese Patent Application Laid-Open No. 07-079574

しかしながら、３レベル電力変換装置の並列接続システムにおいて、各々の３レベル電力変換装置が個別に制御を行い、系統に対して無効電力を重畳させた場合、システム全体として 無効電力が大きくなるため、系統の品質を悪化させる恐れがある。   However, in a parallel connection system of three-level power converters, when each three-level power converter individually controls and superimposes reactive power on the grid, the reactive power increases as a whole system. There is a risk of deteriorating the quality.

以上示したようなことから、３レベル電力変換装置の並列接続システムにおいて、中性点電位を制御すると共に、無効電力が大きくなり系統の品質が悪化することを抑制することが課題となる。   As described above, in the parallel connection system of the three-level power conversion device, it becomes a problem to control the neutral point potential and to prevent the reactive power from increasing and the quality of the system from deteriorating.

本発明は、前記従来の問題に鑑み、案出されたもので、その一態様は、交流電源の電圧を正極，中性点，負極の３電位の直流電圧に変換する３レベルコンバータと、前記正極，中性点，負極の３電位の直流電圧から３レベルの電圧に変換した交流出力を生成する３レベルインバータと、を備えたユニットを並列接続した３レベル電力変換装置の並列接続システムであって、３レベルコンバータを制御する整流器制御器は、直流電圧偏差が閾値以上、または閾値を超過した時、ユニット数が２Ｎの場合、Ｎ台のユニットに遅れ極性の無効電力指令を重畳し、その他のＮ台のユニットに進み極性の無効電力指令を重畳し、ユニット数が２Ｎ＋１の場合、Ｎ＋１台のユニットに遅れ極性の無効電力指令を重畳し、その他のＮ台のユニットに進み極性の無効電力指令を重畳し、または、Ｎ台のユニットに遅れ極性の無効電力指令を重畳し、その他のＮ＋１台のユニットに進み極性の無効電力指令を重畳することを特徴とする。   The present invention has been devised in view of the conventional problems, and one aspect thereof is a three-level converter that converts a voltage of an AC power source into a DC voltage of three potentials of a positive electrode, a neutral point, and a negative electrode, A parallel connection system of a three-level power conversion device in which units including a positive-polarity, a neutral point, and a negative-polarity three-level inverter that generates an alternating-current output converted into a three-level voltage are connected in parallel. The rectifier controller that controls the three-level converter superimposes a reactive power command with a delayed polarity on N units when the DC voltage deviation is greater than or equal to or exceeds the threshold and the number of units is 2N. If the number of units is 2N + 1, the reactive power command of polarity is superimposed on the N units, and the reactive power command of polarity is superimposed on the N + 1 units, and the polarity is advanced to the other N units. It superimposes the reactive power command, or superimposes the reactive power command delay polarity N stand unit, characterized by superimposing a reactive power command polarity advances to other N + 1 single unit.

また、その一態様は、前記３電位の直流電圧は、正極と中性点、中性点と負極との間に介挿され、互いに直列接続されたコンデンサを備えたことを特徴とする。   In one aspect, the three-potential direct current voltage includes a capacitor that is interposed between a positive electrode and a neutral point, a neutral point and a negative electrode, and is connected in series.

本発明によれば、３レベル電力変換装置の並列接続システムにおいて、中性点電位を制御すると共に、無効電力が大きくなり系統の品質が悪化することを抑制することが可能となる。   ADVANTAGE OF THE INVENTION According to this invention, in the parallel connection system of a three level power converter device, while controlling a neutral point potential, it becomes possible to suppress that reactive power becomes large and the quality of a system | strain deteriorates.

実施形態における３レベル電力変換装置の並列接続システムを示すブロック図。The block diagram which shows the parallel connection system of the 3 level power converter device in embodiment. 実施形態における整流器制御器を示すブロック図。The block diagram which shows the rectifier controller in embodiment. 実施形態におけるＯＲ回路と指令極性選択ブロックを示すブロック図。The block diagram which shows the OR circuit and instruction | command polarity selection block in embodiment.

以下、本願発明に係る３レベル電力変換装置の並列接続システムにおける実施形態を図１〜図３に基づいて詳述する。   Hereinafter, an embodiment in a parallel connection system of a three-level power converter according to the present invention will be described in detail with reference to FIGS.

［実施形態］
図１は、本実施形態における３レベル電力変換装置の並列接続システムを示すブロック図である。図１に示すように、交流電源１と負荷４との間には、複数のユニット５が並列接続される。各ユニット５では、 交流電源１から出力された交流電圧を、系統を介して各３レベルコンバータ２で３電位（正極、中性点、負極）の直流電圧に変換する。前記正極と中性点との間にコンデンサｃ１が介挿され、中性点と負極との間にコンデンサｃ２が介挿される。このコンデンサｃ１とｃ２は直列接続される。そして、３レベルインバータ３において、コンデンサｃ１，ｃ２の直流電圧を３レベルの交流電圧に変換して負荷４に供給する。 [Embodiment]
FIG. 1 is a block diagram showing a parallel connection system of three-level power conversion devices according to this embodiment. As shown in FIG. 1, a plurality of units 5 are connected in parallel between an AC power source 1 and a load 4. In each unit 5, the AC voltage output from the AC power source 1 is converted into a DC voltage of three potentials (positive electrode, neutral point, negative electrode) by each three-level converter 2 through the system. A capacitor c1 is inserted between the positive electrode and the neutral point, and a capacitor c2 is inserted between the neutral point and the negative electrode. The capacitors c1 and c2 are connected in series. In the three-level inverter 3, the DC voltage of the capacitors c1 and c2 is converted into a three-level AC voltage and supplied to the load 4.

なお、交流電源１と３レベルコンバータ２との間、および、３レベルインバータ３と負荷４との間には、フィルタ６ａ，６ｂが介挿される。また、３レベルコンバータ２は、整流器制御器７により制御される。   Filters 6 a and 6 b are interposed between the AC power supply 1 and the three-level converter 2 and between the three-level inverter 3 and the load 4. The three-level converter 2 is controlled by a rectifier controller 7.

また、図１に示すように、交流電源１とフィルタ６ａとの間の入力電流と、フィルタ６ａと３レベルコンバータ２との間の整流器電流と、３レベルコンバータ２で変換された正極と中性点との間の直流電圧検出値（上）と、３レベルコンバータ２で変換された中性点と負極との間の直流電圧検出値（下）と、を検出する。   Further, as shown in FIG. 1, the input current between the AC power source 1 and the filter 6a, the rectifier current between the filter 6a and the three-level converter 2, the positive electrode converted by the three-level converter 2, and the neutrality A DC voltage detection value between the points (upper) and a DC voltage detection value (lower) between the neutral point converted by the three-level converter 2 and the negative electrode are detected.

本実施形態では、各々の３レベルインバータが系統に対して重畳する無効電力をシステム全体で制御し、各々の３レベルインバータの中性点電位を安定化させる。また、系統に対し必要以上の無効電力を重畳しないようにする。そのため、図２および図３のアルゴリズムにより中性点電位変動について制御を行う。   In this embodiment, the reactive power superimposed on the grid by each three-level inverter is controlled by the entire system, and the neutral point potential of each three-level inverter is stabilized. In addition, avoid unnecessary superposition of reactive power on the grid. Therefore, the neutral point potential fluctuation is controlled by the algorithm shown in FIGS.

図２は本実施形態における整流器制御器７を示すブロック図である。 直流電圧偏差部１１において、図１に示す直流電圧検出値（上）と直流電圧検出値（下）との偏差を演算する。この直流電圧の偏差を絶対値変換部１２で絶対値に変換する。次に、閾値判定部１３において前記の絶対値と闘値とを比較し、前記絶対値が閾値以上となった場合、または、閾値を超過した場合に中性点電位変動の閾値超過信号を出力する。   FIG. 2 is a block diagram showing the rectifier controller 7 in the present embodiment. The DC voltage deviation unit 11 calculates a deviation between the DC voltage detection value (upper) and the DC voltage detection value (lower) shown in FIG. The deviation of the DC voltage is converted into an absolute value by the absolute value converter 12. Next, the threshold value determination unit 13 compares the absolute value and the threshold value, and outputs a threshold excess signal of neutral point potential fluctuation when the absolute value is equal to or greater than the threshold value or when the threshold value is exceeded. To do.

または、本実施形態における整流器制御器７は、そのユニット５が運転しているか否かを示す運転信号を出力する。また、後述する無効電力指令の極性を決める極性信号を入力する。   Or the rectifier controller 7 in this embodiment outputs the operation signal which shows whether the unit 5 is drive | operating. In addition, a polarity signal for determining the polarity of a reactive power command to be described later is input.

なお、図２の整流器制御器７は、閾値超過信号を生成する制御ブロックと運転信号の出力、無効電力指令の極性信号の入力以外は、従来の３レベルコンバータと同様である。   The rectifier controller 7 in FIG. 2 is the same as the conventional three-level converter except for the control block that generates the threshold excess signal, the output of the operation signal, and the input of the polarity signal of the reactive power command.

具体的には、直流電圧指令と直流電圧検出値との偏差を減算部１４で算出し、その偏差に基づいて電圧制御部１５で比例積分制御（ＰＩ制御）による電圧制御を行う。また、極性信号に基づいた無効電力指令と無効電力検出値との偏差を減算部１６で算出し、その偏差に基づいて無効電力制御部１７で比例積分制御（ＰＩ制御）による無効電力制御を行う。この電圧制御部１５の出力と無効電力制御部１７の出力と整流器電流とに基づいて、電流制御部１８により電流制御を行う。   Specifically, the deviation between the DC voltage command and the detected DC voltage value is calculated by the subtracting unit 14, and the voltage control unit 15 performs voltage control by proportional integral control (PI control) based on the deviation. Further, the subtraction unit 16 calculates a deviation between the reactive power command based on the polarity signal and the detected reactive power value, and the reactive power control unit 17 performs reactive power control by proportional integral control (PI control) based on the deviation. . Based on the output of the voltage control unit 15, the output of the reactive power control unit 17, and the rectifier current, the current control unit 18 performs current control.

さらに、直流電圧の偏差と整流器電流検出値とに基づいて、中性点電位制御部１９により中性点電位制御を行う。前記の電流制御部１８の出力と中性点電位制御部１９の出力との合計値に基づいてＰＷＭ制御器２０により、ＰＷＭ信号を生成して整流器のスイッチング素子をオンおよびオフの制御を行う。   Furthermore, the neutral point potential control is performed by the neutral point potential control unit 19 based on the deviation of the DC voltage and the detected value of the rectifier current. A PWM controller 20 generates a PWM signal based on the total value of the output of the current control unit 18 and the output of the neutral point potential control unit 19 and controls the switching elements of the rectifier to be turned on and off.

並列接続されているユニット５のうち任意の１台をマスター機とする。 そして、マスター機には図３に示すように、ＯＲ回路２１と、極性選択ブロック２２が設けられる。   Any one of the units 5 connected in parallel is set as a master machine. The master machine is provided with an OR circuit 21 and a polarity selection block 22 as shown in FIG.

ＯＲ回路２１はＮ台並列接続される３レベルインバータ全ての閾値超過信号を入力する。 ＯＲ回路２１は全てのユニット５の閾値検出信号のうち少なくとも何れか１つが「Ｈ」レベルの場合、「Ｈ」レベルの信号を極性選択ブロック２２に出力する。   The OR circuit 21 inputs an over-threshold signal for all three level inverters connected in parallel. The OR circuit 21 outputs an “H” level signal to the polarity selection block 22 when at least one of the threshold detection signals of all the units 5 is at the “H” level.

極性選択ブロック２２は各ユニット５の整流器制御器７から運転しているか否かの運転信号を入力する。極性選択ブロック２２は、運転している全てのユニット５の整流器制御器７に対して無効電力の極性信号を送る。各ユニット５の整流器制御器７は、その極性信号に基づいて無効電力指令を系統に対して重畳させ中性点電位を安定化（中性点電位変動を抑制）させる。   The polarity selection block 22 inputs an operation signal indicating whether or not the operation is performed from the rectifier controller 7 of each unit 5. The polarity selection block 22 sends a reactive power polarity signal to the rectifier controllers 7 of all the units 5 in operation. The rectifier controller 7 of each unit 5 stabilizes the neutral point potential (suppresses neutral point potential fluctuations) by superimposing a reactive power command on the system based on the polarity signal.

マスター機の極性選択ブロック２２は無効電力指令を決定する際に各々のユニット５から出力される運転信号に基づいて、現在の並列運転台数を識別し、系統に対して重畳する無効電力が最小になるように並列接続システム全体の各３レベルインバータに対して無効電力指令の極性（遅れ／進み）を決定する。   When determining the reactive power command, the polarity selection block 22 of the master machine identifies the current parallel operation number based on the operation signal output from each unit 5 and minimizes the reactive power superimposed on the system. Thus, the polarity (delay / advance) of the reactive power command is determined for each three-level inverter of the entire parallel connection system.

無効電力指令の極性決定アルゴリズムは、並列運転台数が２Ｎ（偶数）の場合遅れ極性Ｎ台、進み極性Ｎ台とする。また、並列運転代数が２Ｎ＋１（奇数）の場合、遅れ極性Ｎ＋１台、進み極性Ｎ台，または、遅れ極性Ｎ台、進み極性Ｎ＋1台とする。これにより、３レベル電力変換装置の並列接続システム全体としては系統に対して無効電力を抑制することができる。   The reactive power command polarity determination algorithm is set to N delayed polarities and N advanced polarities when the number of units in parallel operation is 2N (even number). Further, when the parallel operation algebra is 2N + 1 (odd number), it is assumed that there are N + 1 delayed polarities, N advanced polarities, or N delayed polarities, N advanced polarities. Thereby, reactive power can be suppressed with respect to a system | strain as the whole parallel connection system of a three level power converter device.

仮に中性点を安定化させるためにＮ台すべての３レベルインバータが系統に対して遅れ無効電力を重畳した場合、一台当たりの無効電力をＱとすればＮ×Ｑの無効電力を系統に対して重畳させることになる。それに対し、本実施形態では遅れ極性と進み極性の無効電力指令に分けることにより、並列接続されたユニット５の台数がＮ＝２Ｍ＋１（奇数台）の場合、系統に対してＱ＝（Ｍ＋１）×Ｑ＋Ｍ×（−Ｑ）の無効電力を重畳させることとなる。また、並列接続されたユニット５がＮ＝２Ｍ（偶数台）の場合、系統に対する重畳は０＝Ｍ×Ｑ＋Ｍ×（−Ｑ）となり、各３レベルインバータは規定の無効電流を流し、中性点電位を安定化させることができ、さらに、系統に対して重畳する無効電力を小さく することが可能となる。   If all three N-level inverters have delayed reactive power superimposed on the grid to stabilize the neutral point, N × Q reactive power will be added to the grid if the reactive power per unit is Q. It will be superimposed on. On the other hand, in the present embodiment, by dividing into reactive power commands of delayed polarity and advanced polarity, when the number of units 5 connected in parallel is N = 2M + 1 (odd number), Q = (M + 1) × Q + M × (−Q) reactive power is superposed. In addition, when the units 5 connected in parallel are N = 2M (even number), the superposition on the system is 0 = M × Q + M × (−Q), and each three-level inverter passes a specified reactive current, and the neutral point The potential can be stabilized, and the reactive power superimposed on the system can be reduced.

以上示したように、本実施形態によれば、 中性点電位が変動した場合、系統に対して無効電力を重畳することにより、中性点電位の変動を抑制すると共に、系統に対して重畳する無効電力を最小にすることが可能となる。   As described above, according to the present embodiment, when the neutral point potential fluctuates, the reactive power is superimposed on the system to suppress the fluctuation of the neutral point potential and to be superimposed on the system. It becomes possible to minimize the reactive power to be performed.

以上、本発明において、記載された具体例に対してのみ詳細に説明したが、本発明の技術思想の範囲で多彩な変形および修正が可能であることは、当業者にとって明白なことであり、このような変形および修正が特許請求の範囲に属することは当然のことである。   Although the present invention has been described in detail only for the specific examples described above, it is obvious to those skilled in the art that various changes and modifications are possible within the scope of the technical idea of the present invention. Such variations and modifications are naturally within the scope of the claims.

例えば、図１では、コンデンサｃ１，ｃ２それぞれ１つの構成を示しているが、それぞれ複数直列接続してもよい。   For example, FIG. 1 shows one configuration for each of the capacitors c1 and c2, but a plurality of capacitors c1 and c2 may be connected in series.

７…整流器制御器
１１…直流電圧偏差部
１２…絶対値変換部
１３…閾値判定部
１４，１６…減算部
１５…電圧制御部
１７…無効電力制御部
１８…電流制御部
１９…中性点電位制御部
２０…ＰＷＭ制御部 DESCRIPTION OF SYMBOLS 7 ... Rectifier controller 11 ... DC voltage deviation part 12 ... Absolute value conversion part 13 ... Threshold value determination part 14, 16 ... Subtraction part 15 ... Voltage control part 17 ... Reactive power control part 18 ... Current control part 19 ... Neutral point potential Control unit 20: PWM control unit

Claims (2)

交流電源の電圧を正極，中性点，負極の３電位の直流電圧に変換する３レベルコンバータと、
前記正極，中性点，負極の３電位の直流電圧から３レベルの電圧に変換した交流出力を生成する３レベルインバータと、を備えたユニットを並列接続した３レベル電力変換装置の並列接続システムであって、
３レベルコンバータを制御する整流器制御器は、
直流電圧偏差が閾値以上、または閾値を超過した時、
ユニット数が２Ｎの場合、Ｎ台のユニットに遅れ極性の無効電力指令を重畳し、その他のＮ台のユニットに進み極性の無効電力指令を重畳し、ユニット数が２Ｎ＋１の場合、Ｎ＋１台のユニットに遅れ極性の無効電力指令を重畳し、その他のＮ台のユニットに進み極性の無効電力指令を重畳し、または、Ｎ台のユニットに遅れ極性の無効電力指令を重畳し、その他のＮ＋１台のユニットに進み極性の無効電力指令を重畳することを特徴とする３レベル電力変換装置の並列接続システム。 A three-level converter that converts the voltage of the AC power source into a DC voltage of three potentials: positive, neutral, and negative;
A parallel connection system of a three-level power conversion device in which units having a positive output, a neutral point, and a negative potential to generate an alternating current output converted from a three-potential direct-current voltage into a three-level voltage are connected in parallel. There,
The rectifier controller that controls the three-level converter is
When the DC voltage deviation exceeds the threshold value or exceeds the threshold value,
When the number of units is 2N, the reactive power command with a delayed polarity is superimposed on N units, and the reactive power command with a polarity is superimposed on the other N units, and when the number of units is 2N + 1, N + 1 units The delay polarity reactive power command is superimposed on the other N units, the polarity reactive power command is superimposed on the other N units, or the delay polarity reactive power command is superimposed on the N units, and the other N + 1 units A parallel connection system for a three-level power converter, wherein a reactive power command of polarity is superimposed on the unit. 前記３電位の直流電圧は、正極と中性点、中性点と負極との間に介挿され、互いに直列接続されたコンデンサを備えたことを特徴とする請求項１記載の３レベル電力変換装置の並列接続システム。   2. The three-level power conversion according to claim 1, further comprising capacitors connected in series with each other, wherein the DC voltage of the three potentials is interposed between the positive electrode and the neutral point, and between the neutral point and the negative electrode. Equipment parallel connection system.
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