JP2000358374A - Power converter - Google Patents
Power converterInfo
- Publication number
- JP2000358374A JP2000358374A JP11166451A JP16645199A JP2000358374A JP 2000358374 A JP2000358374 A JP 2000358374A JP 11166451 A JP11166451 A JP 11166451A JP 16645199 A JP16645199 A JP 16645199A JP 2000358374 A JP2000358374 A JP 2000358374A
- Authority
- JP
- Japan
- Prior art keywords
- command signal
- current command
- phase
- axis
- axis current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、例えば三相の交
流電力系統である第１の電力系統と、例えば直流電圧一
定制御で運転される直流の第２の電力系統との間に接続
され、スイッチング素子により構成される電力変換部を
持ち、出力可能な交流電流の最大値Ｉｍが有限である、
第１の電力系統と第２の電力系統との間で電力を変換す
る電力変換装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is connected between a first power system, for example, a three-phase AC power system, and a DC second power system, for example, operated under a constant DC voltage control, It has a power conversion unit composed of a switching element, and the maximum value Im of the outputable AC current is finite.
The present invention relates to a power conversion device that converts power between a first power system and a second power system.
【０００２】[0002]
【従来の技術】図８は例えば「高性能交直変換器用制御
システムの開発」（坂本ら著、電気学会研究会資料PE-9
8-5）に記載された従来の電力変換装置の構成図であ
る。図において、１はこの電力変換装置に接続された三
相の交流電力系統であり、２は交流電力系統１と電力変
換部３とに接続された変圧器であり、３はＧＴＯ（Gate
Turn-off Thyristor）などのスイッチング素子を利用
してＰＷＭ（Pulse Width Modulation）方式に基づいて
交流直流間で電力変換を行う電力変換部であり、４は直
流キャパシタであり、５は直流電圧一定制御で運転する
他の電力変換装置などの直流電圧源であり、６は交流電
力系統１に変圧器２を接続する連系線路の電圧値を検出
する電圧値検出手段であり、７は連系線路を流れる電流
の値を検出する電流値検出手段であり、100は電圧値検
出手段６および電流値検出手段７に基づいて電力変換部
３を制御する制御部である。2. Description of the Related Art FIG. 8 shows, for example, "Development of a control system for a high-performance AC-DC converter" (Sakamoto et al., IE-9 Technical Meeting Material PE-9).
It is a block diagram of the conventional power converter described in 8-5). In the figure, 1 is a three-phase AC power system connected to the power converter, 2 is a transformer connected to the AC power system 1 and the power converter 3, and 3 is a GTO (Gate).
A power conversion unit that performs power conversion between AC and DC based on a PWM (Pulse Width Modulation) method using a switching element such as a turn-off Thyristor, 4 is a DC capacitor, and 5 is a constant DC voltage control. 6 is a voltage value detecting means for detecting a voltage value of an interconnecting line connecting the transformer 2 to the AC power system 1, and 7 is an interconnecting line. Is a current value detection means for detecting the value of the current flowing through the control circuit. Reference numeral 100 denotes a control section for controlling the power conversion section 3 based on the voltage value detection means 6 and the current value detection means 7.
【０００３】制御部１００において、１１は電圧値検出
手段６により検出された電圧検出値を入力として交流系
統電圧の位相に同期した基準位相θを出力する基準位相
演算手段であり、１２は電流値検出手段７により検出さ
れた電流検出値Ｉおよび基準位相θに基づいて電流検出
値の基準位相に同期した回転座標系における値であるｄ
軸電流Ｉｄおよびｑ軸電流Ｉｑを出力する電流成分演算
手段であり、１３ａは所定のｄ軸電流指令信号Ｉｄｒお
よびｄ軸電流検出信号Ｉｄを入力としｄ軸電圧制御指令
信号Ｖｄｉを出力する制御手段であり、１３ｂは所定の
ｑ軸電流指令信号Ｉｑｒおよびｑ軸電流検出信号Ｉｑを
入力としｑ軸電圧制御指令信号Ｖｑｉを出力する制御手
段であり、１４はＶｄｉおよびＶｑｉを入力として各相
の電圧指令信号Ｖａｉ、Ｖｂｉ、Ｖｃｉを出力する演算
手段であり、１５は各相の電圧指令信号Ｖａｉ、Ｖｂ
ｉ、Ｖｃｉに基づいて電力変換部３を制御する制御信号
を算出し電力変換部３へ出力する演算手段である。In the control unit 100, reference numeral 11 denotes a reference phase calculating means for inputting the detected voltage value detected by the voltage value detecting means 6 and outputting a reference phase θ synchronized with the phase of the AC system voltage; Based on the current detection value I detected by the detection means 7 and the reference phase θ, d is a value in a rotating coordinate system synchronized with the reference phase of the current detection value.
A current component calculating means for outputting the axis current Id and the q-axis current Iq, and a control means 13a for receiving a predetermined d-axis current command signal Idr and a d-axis current detection signal Id and outputting a d-axis voltage control command signal Vdi 13b is a control means which receives a predetermined q-axis current command signal Iqr and a q-axis current detection signal Iq and outputs a q-axis voltage control command signal Vqi, and 14 denotes a voltage of each phase which receives Vdi and Vqi as inputs. Arithmetic means for outputting command signals Vai, Vbi, Vci, and 15 denotes voltage command signals Vai, Vb of each phase.
i is a calculating means for calculating a control signal for controlling the power conversion unit 3 based on Vci and outputting the control signal to the power conversion unit 3.
【０００４】次に動作について説明する。基準位相演算
手段１１は電圧値検出手段６の検出値から交流電力系統
１の正相ｄ軸電圧の位相を算出し、基準位相θとして出
力する。電流成分演算手段１２は電流値検出手段７の検
出値を入力として、基準位相θに同期した回転座標系
（ｄ、ｑ）における各電流成分ＩｄおよびＩｑを演算
し、それぞれ制御手段１３ａおよび１３ｂへ出力する。
制御手段１３ａは所定のｄ軸電流指令信号Ｉｄｒおよび
ｄ軸電流値Ｉｄを入力として、ＩｄがＩｄｒに追従する
ための制御信号としてｄ軸電圧指令信号Ｖｄｉを演算
し、演算手段１４へ出力する。制御手段１３ｂは所定の
ｑ軸電流指令信号Ｉｑｒおよびｑ軸電流値Ｉｑを入力と
して、ＩｑがＩｑｒに追従するための制御信号としてｑ
軸電圧指令信号Ｖｑｉを演算し、演算手段１４へ出力す
る。演算手段１４は制御手段１３ａの出力Ｖｄｉおよび
制御手段１３ｂの出力Ｖｑｉならびに基準位相θに基づ
いて三相それぞれの電圧指令信号Ｖａｉ、Ｖｂｉおよび
Ｖｃｉを演算し、演算手段１５へ出力する。演算手段１
５はＶａｉ、ＶｂｉおよびＶｃｉに基づいて電力変換部
３に含まれるスイッチング素子を動作させるための制御
信号を演算して電力変換部３へ出力する。電力変換部３
は演算手段１５により入力された信号に基づいてそのス
イッチング素子を動作させ、電力変換を実行する。この
とき、電力変換部３は各相の電圧指令信号Ｖａｉ、Ｖｂ
ｉおよびＶｃｉに比例した電圧を発生する。Next, the operation will be described. The reference phase calculation means 11 calculates the phase of the positive-phase d-axis voltage of the AC power system 1 from the detection value of the voltage value detection means 6 and outputs the calculated value as the reference phase θ. The current component calculating means 12 receives the detection value of the current value detecting means 7 as an input, calculates respective current components Id and Iq in the rotating coordinate system (d, q) synchronized with the reference phase θ, and sends the current components to the control means 13a and 13b, respectively. Output.
The control means 13a receives a predetermined d-axis current command signal Idr and d-axis current value Id, calculates a d-axis voltage command signal Vdi as a control signal for Id to follow Idr, and outputs the signal to the calculation means 14. The control means 13b receives a predetermined q-axis current command signal Iqr and a q-axis current value Iq as inputs and sets q as a control signal for Iq to follow Iqr.
The shaft voltage command signal Vqi is calculated and output to the calculating means 14. The calculating means 14 calculates the voltage command signals Vai, Vbi and Vci of each of the three phases based on the output Vdi of the control means 13a, the output Vqi of the control means 13b and the reference phase θ, and outputs them to the calculating means 15. Calculation means 1
Reference numeral 5 calculates a control signal for operating a switching element included in the power conversion unit 3 based on Vai, Vbi, and Vci, and outputs the control signal to the power conversion unit 3. Power converter 3
Operates the switching element based on the signal input by the arithmetic means 15 to execute power conversion. At this time, the power converter 3 outputs the voltage command signals Vai, Vb of each phase.
Generates a voltage proportional to i and Vci.
【０００５】このように動作することにより、電流指令
ＩｄｒおよびＩｑｒを与えると、電力変換部３は与えら
れたＩｄｒおよびＩｑｒに等しいｄ軸電流Ｉｄおよびｑ
軸電流Ｉｑを出力する。回転座標系（ｄ、ｑ）の回転位
相は交流電力系統１の電圧位相と等しくしているため、
適当な座標変換を選ぶことによりＩｄまたはＩｑは交流
系統１に出力される無効電流または有効電流に相当する
ことになり、ＩｄｒおよびＩｑｒにより、電力変換部３
が出力する有効電流および無効電流それぞれの大きさを
個別に決定し、出力することができる。When current commands Idr and Iqr are given by operating as described above, power converter 3 outputs d-axis currents Id and q equal to given Idr and Iqr.
The shaft current Iq is output. Since the rotation phase of the rotating coordinate system (d, q) is equal to the voltage phase of the AC power system 1,
By selecting an appropriate coordinate transformation, Id or Iq corresponds to a reactive current or an active current output to the AC system 1, and the power conversion unit 3 is determined by Idr and Iqr.
Can individually determine the magnitude of each of the active current and the reactive current that are output, and output them.
【０００６】[0006]
【発明が解決しようとする課題】ところで、電力変換部
３が出力できる電流は、その中に使われている素子など
の能力によりその大きさの上限が決まっている。従来の
方法では交流電流をすべて正相電流のｄ−ｑ軸座標系成
分に変換し、電力変換部の出力するｄ軸電流およびｑ軸
電流がそれぞれ所定の指令に追従するように制御するも
のであり、上記ｄ軸電流指令およびｑ軸電流指令自体に
上限値を設定することで比較的簡単に、電流が上限値を
越えないようにすることができる。しかるに、ｄ軸電流
およびｑ軸電流を更にそれぞれ正相分と逆相分とに区分
してなる４軸電流指令信号を入力して制御する場合であ
って、その正相成分または逆相成分のいずれか一方を優
先的に出力し、いずれか他方を従属的に出力するような
電力変換運用が要求される複雑な制御方式の場合にあっ
ては、単に各軸電流指令自体を一定限度内に制限するの
みでは適切な電流上限値対策とはなりえなかった。The upper limit of the current that can be output from the power conversion unit 3 is determined by the capabilities of elements used therein. In the conventional method, all the AC currents are converted into the d-q coordinate system components of the positive-phase current, and control is performed so that the d-axis current and the q-axis current output from the power conversion unit respectively follow predetermined commands. Yes, by setting upper limits for the d-axis current command and the q-axis current command itself, it is possible to relatively easily prevent the current from exceeding the upper limits. However, this is a case where the d-axis current and the q-axis current are further controlled by inputting a 4-axis current command signal obtained by dividing the current into a positive-phase component and a negative-phase component, respectively. In the case of a complicated control system that requires power conversion operation such that one of the axes is output with priority and the other is output subordinately, each axis current command itself is simply set within a certain limit. Restriction alone could not be an appropriate current upper limit measure.
【０００７】この発明は上記のような課題を解決するた
めになされたもので、４軸電流指令信号を入力して電力
変換部を制御する場合に、その電力変換部の電流がその
上限値を越えないという制限条件を確実合理的に実現す
ることができる電力変換装置を得ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. When a 4-axis current command signal is input to control a power conversion unit, the current of the power conversion unit is limited to an upper limit. It is an object of the present invention to obtain a power converter capable of reliably and reasonably realizing a restriction condition of not exceeding.
【０００８】[0008]
【課題を解決するための手段】この発明に係る電力変換
装置は、多相交流の第１の電力系統と、第２の電力系統
との間に接続され上記両系統間で電力の変換を行う電力
変換部、およびこの電力変換部の上記第１の電力系統側
の電流に関し、回転座標系のｄ軸電流およびｑ軸電流を
更にそれぞれ正相分と逆相分とに区分してなる４軸電流
指令信号を入力して上記電力変換部を制御する制御部を
備えた電力変換装置において、上記電力変換部の電流の
大きさが所定の許容電流値を越えないように、上記４軸
電流指令信号の内、正相分または逆相分のいずれか一方
の２軸電流指令信号に制限を加える第１の電流指令信号
制限手段、およびこの第１の電流指令信号制限手段を経
た、上記正相分または逆相分のいずれか一方の２軸電流
指令信号の存在を前提に上記電力変換部の電流の大きさ
が上記所定の許容電流値を越えないように、上記４軸電
流指令信号の内、正相分または逆相分のいずれか他方の
２軸電流指令信号に制限を加える第２の電流指令信号制
限手段を備えたものである。A power converter according to the present invention is connected between a first power system of polyphase alternating current and a second power system and performs power conversion between the two systems. Regarding the power conversion unit and the current on the first power system side of the power conversion unit, the four-axis current obtained by further dividing the d-axis current and the q-axis current of the rotating coordinate system into a positive phase component and a negative phase component, respectively. In the power conversion device provided with a control unit for inputting a current command signal and controlling the power conversion unit, the four-axis current command is controlled so that the current of the power conversion unit does not exceed a predetermined allowable current value. First current command signal limiting means for limiting one of the two-phase current command signals for the positive phase and the negative phase of the signals; and the positive phase signal passing through the first current command signal limiting means. Of the two-axis current command signal for either the In addition, in order to prevent the magnitude of the current of the power conversion unit from exceeding the predetermined allowable current value, of the four-axis current command signals, the other two-axis current command signals of the positive phase component or the negative phase component are used. And a second current command signal limiting means for limiting the current command signal.
【０００９】また、この発明に係る電力変換装置は、そ
の電力変換部の第１の電力系統側における所定の許容電
流値をＩｍ、４軸電流指令信号の内、正相分または逆相
分のいずれか一方の２軸電流指令信号をＩ１ｄおよびＩ
１ｑ、同じくいずれか他方の２軸電流指令信号をＩ２ｄ
およびＩ２ｑとした場合、第１の電流指令信号制限手段
は、ｄ軸電流指令信号Ｉ１ｄが下式のＭ１ｄ（上限値）
を越えるときはＭ１ｄを、−Ｍ１ｄ（下限値）未満のと
きは−Ｍ１ｄを、そしてＭ１ｄ〜−Ｍ１ｄのときはＩ１
ｄそのままを、それぞれ出力する第１のｄ軸電流指令信
号制限手段、およびｑ軸電流指令信号Ｉ１ｑが下式のＭ
１ｑ（上限値）を越えるときはＭ１ｑを、−Ｍ１ｑ（下
限値）未満のときは−Ｍ１ｑを、そしてＭ１ｑ〜−Ｍ１
ｑのときはＩ１ｑそのままを、それぞれ出力する第１の
ｑ軸電流指令信号制限手段を備え、第２の電流指令信号
制限手段は、ｄ軸電流指令信号Ｉ２ｄが下式のＭ２ｄ
（上限値）を越えるときはＭ２ｄを、−Ｍ２ｄ（下限
値）未満のときは−Ｍ２ｄを、そしてＭ２ｄ〜−Ｍ２ｄ
のときはＩ２ｄそのままを、それぞれ出力する第２のｄ
軸電流指令信号制限手段、およびｑ軸電流指令信号Ｉ２
ｑが下式のＭ２ｑ（上限値）を越えるときはＭ２ｑを、
−Ｍ２ｑ（下限値）未満のときは−Ｍ２ｑを、そしてＭ
２ｑ〜−Ｍ２ｑのときはＩ２ｑそのままを、それぞれ出
力する第２のｑ軸電流指令信号制限手段を備えたもので
ある。 Ｍ１ｄ＝Ｉｍ・｜Ｉ１ｄ｜／√（Ｉ１ｄ2＋Ｉ１ｑ2） Ｍ１ｑ＝Ｉｍ・｜Ｉ１ｑ｜／√（Ｉ１ｄ2＋Ｉ１ｑ2） Ｍ２ｄ＝{Ｉｍ−√（Ｉ１ｄ2＋Ｉ１ｑ2）}／√{１＋
（Ｉ２ｑ／Ｉ２ｄ）2} Ｍ２ｑ＝{Ｉｍ−√（Ｉ１ｄ2＋Ｉ１ｑ2）}／√{１＋
（Ｉ２ｄ／Ｉ２ｑ）2}In the power converter according to the present invention, the predetermined permissible current value on the first power system side of the power conversion unit is set to a value corresponding to a positive phase component or a negative phase component of the Im and 4-axis current command signals. Either one of the two-axis current command signals is
1q, the other two-axis current command signal is also I2d
And I2q, the first current command signal limiting means determines that the d-axis current command signal I1d is M1d (upper limit) of the following equation:
Is exceeded, M1d is set when -M1d (lower limit) is less than -M1d, and when M1d to -M1d is set to I1d.
d, the first d-axis current command signal limiting means for outputting the signal as it is, and the q-axis current command signal I1q
M1q when exceeding 1q (upper limit), -M1q when less than -M1q (lower limit), and M1q to -M1
In the case of q, there is provided first q-axis current command signal limiting means for respectively outputting I1q as it is, and the second current command signal limiting means outputs d-axis current command signal I2d as M2d
M2d when exceeding (upper limit), -M2d when less than -M2d (lower limit), and M2d to -M2d.
In the case of the second d
Axis current command signal limiting means, and q-axis current command signal I2
When q exceeds M2q (upper limit) of the following equation, M2q is used,
If less than -M2q (lower limit), -M2q and M
In the case of 2q to -M2q, a second q-axis current command signal limiting means for outputting I2q as it is is provided. M1d = Im · | I1d | / √ (I1d 2 + I1q 2 ) M1q = Im · | I1q | / √ (I1d 2 + I1q 2 ) M2d = {Im−Ｉ (I1d 2 + I1q 2 )} / √ {1+
(I2q / I2d) 2 } M2q = {Im−√ (I1d 2 + I1q 2 )} / √ {1+
(I2d / I2q) 2 }
【００１０】また、この発明に係る電力変換装置は、そ
の第１および第２の電流指令信号制限手段を経た４軸電
流指令信号を基準形態の各基準電流指令信号に変換する
電流指令信号変換手段、電力変換部の第１の電力系統側
の電流検出値を上記基準形態の各基準電流検出信号に変
換する電流検出信号変換手段、上記各基準電流指令信号
と各基準電流検出信号とがそれぞれ一致するように上記
各両信号の偏差に基づき各相電圧指令信号を出力する第
１の制御手段、および上記各相電圧指令信号に基づき上
記電力変換部の出力電圧を制御する第２の制御手段を備
えたものである。The power converter according to the present invention further comprises a current command signal converting means for converting the four-axis current command signal having passed through the first and second current command signal limiting means into each reference current command signal in a reference form. Current detection signal converting means for converting a current detection value on the first power system side of the power conversion unit into each of the reference current detection signals of the above-mentioned reference form, wherein each of the above-mentioned reference current command signals and each of the reference current detection signals coincide with each other First control means for outputting each phase voltage command signal based on the deviation between the two signals, and second control means for controlling the output voltage of the power conversion unit based on each phase voltage command signal. It is provided.
【００１１】また、この発明に係る電力変換装置の電流
指令信号変換手段は、第１の電力系統の３相交流電圧か
ら基準位相を検出してこの基準位相に基づき４軸電流指
令信号を３相基準電流指令信号に変換し、電流検出信号
変換手段は、電力変換部の上記第１の電力系統側の電流
検出値を３相基準電流検出信号として出力するものであ
る。Further, the current command signal conversion means of the power converter according to the present invention detects a reference phase from the three-phase AC voltage of the first power system and converts the four-axis current command signal into three phases based on the reference phase. The reference current command signal is converted into a reference current command signal, and the current detection signal conversion means outputs a detected current value on the first power system side of the power conversion unit as a three-phase reference current detection signal.
【００１２】また、この発明に係る電力変換装置の電流
指令信号変換手段は、第１の電力系統の３相交流電圧か
ら基準位相を検出してこの基準位相に基づき４軸電流指
令信号をｄ−ｑ２軸基準電流指令信号に変換し、電流検
出信号変換手段は、電力変換部の上記第１の電力系統側
の電流検出値を上記基準位相に基づきｄ−ｑ２軸基準電
流検出信号に変換するものである。Further, the current command signal converting means of the power converter according to the present invention detects a reference phase from the three-phase AC voltage of the first power system, and outputs a four-axis current command signal based on the reference phase. A q2 axis reference current command signal, and the current detection signal conversion means converts a current detection value on the first power system side of the power conversion unit into a dq2 axis reference current detection signal based on the reference phase. It is.
【００１３】また、この発明に係る電力変換装置の電流
指令信号変換手段は、第１および第２の電流指令信号制
限手段を経た４軸電流指令信号を４軸基準電流指令信号
として出力し、電流検出信号変換手段は、第１の電力系
統の３相交流電圧から基準位相を検出し、電力変換部の
上記第１の電力系統側の電流検出値を上記基準位相に基
づき４軸基準電流検出信号に変換するものである。The current command signal converting means of the power converter according to the present invention outputs the four-axis current command signal passed through the first and second current command signal limiting means as a four-axis reference current command signal. The detection signal conversion means detects a reference phase from the three-phase AC voltage of the first power system, and converts a current detection value of the power conversion unit on the first power system side into a four-axis reference current detection signal based on the reference phase. Is converted to
【００１４】[0014]
【発明の実施の形態】実施の形態１．図１は、この発明
の実施の形態１における電力変換装置を示す構成図であ
る。図において、１は第１の電力系統としての三相の交
流電力系統、４および５は第２の電力系統としてのそれ
ぞれ直流キャパシタおよびこの直流キャパシタ４の直流
電圧を一定に保つ他の電力変換装置などの直流電圧源で
ある。３はその交流側が変圧器２を介して交流電力系統
１に接続され、その直流側が直流キャパシタ４に接続さ
れ両系統間で電力の変換を行う電力変換部で、後述の制
御部２００とによりこの発明になる電力変換装置を構成
する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram showing a power conversion device according to Embodiment 1 of the present invention. In the figure, 1 is a three-phase AC power system as a first power system, 4 and 5 are DC capacitors as a second power system, respectively, and another power conversion device for keeping the DC voltage of the DC capacitor 4 constant. DC voltage source. Reference numeral 3 denotes a power conversion unit whose AC side is connected to the AC power system 1 via the transformer 2 and whose DC side is connected to the DC capacitor 4 and converts power between the two systems. A power conversion device according to the present invention is configured.
【００１５】次に、４軸電流指令信号Ｉ′ｐｄｒ、Ｉ′
ｐｑｒ、Ｉ′ｎｄｒ、Ｉ′ｎｑｒを入力して電圧指令信
号Ｖｉｃを作成し、電力変換部３に送出する制御部２０
０について説明するが、先ず、この４軸電流指令信号を
入力して電力系統制御を行う必要性を具体例によって説
明する。即ち、一つの例としては、例えば、複数台の電
力変換装置によって電力が送られている系統において、
その装置の一部が４軸電流指令信号方式の電力変換装置
であり、その他の電力変換装置が発電機のような機械的
な機構を有する装置である場合を想定する。後者の装置
が不平衡電力を供給しようとすると、その発電機の軸の
ねじれや発電機を回転する動力の脈動などが発生する
が、このような場合、並列運転中の４軸電流指令信号方
式の電力変換装置を、逆相成分を優先し、正相成分を従
属させる方式の電流制御を行うことにより、機械式電力
変換装置の不平衡電力（逆相電力）供給の負担を軽減し
て上記不具合の現象を抑制することができる。Next, the 4-axis current command signals I'pdr, I '
The control unit 20 which receives pqr, I'ndr, and I'nqr to create a voltage command signal Vic and sends it to the power conversion unit 3
First, the necessity of inputting the four-axis current command signal to perform power system control will be described using a specific example. That is, as one example, for example, in a system where power is transmitted by a plurality of power converters,
It is assumed that a part of the power conversion device is a four-axis current command signal type power conversion device, and the other power conversion device is a device having a mechanical mechanism such as a generator. If the latter device attempts to supply unbalanced power, a twist of the shaft of the generator or a pulsation of the power for rotating the generator will occur. In such a case, the four-axis current command signal system during the parallel operation is used. The power converter of the above-mentioned type performs current control of a method of giving priority to the negative phase component and making the positive phase component dependent, thereby reducing the load of unbalanced power (negative phase power) supply of the mechanical power converter. The problem phenomenon can be suppressed.
【００１６】また、機械式の電力変換装置が例えば、有
効電力供給の即応性が悪い場合、４軸電流指令信号方式
の電力変換装置を、上例とは逆に、正相成分を優先し、
逆相成分を従属させる方式で制御することにより、負荷
が必要とする正相電力の供給を優先的に確保することが
可能となる。以上のように、４軸電流指令信号の内、正
相ｄ、ｑ軸電流指令信号または逆相ｄ、ｑ軸電流指令信
号のいずれか一方を優先、他方を従属に位置付け、電力
変換部の制御を行う方式は、系統運用上、極めて有用で
あり、この発明は、この４軸電流指令信号方式下におけ
る必要な電流制限を実効あらしめるものである。以下、
その主要構成部である制御部２００について説明する。If the mechanical power converter has, for example, poor responsiveness to the supply of active power, a four-axis current command signal type power converter, contrary to the above example, gives priority to the positive phase component,
By controlling the negative phase component in a dependent manner, it is possible to preferentially secure the supply of the positive phase power required by the load. As described above, of the four-axis current command signals, one of the positive-phase d and q-axis current command signals or the negative-phase d and q-axis current command signals is prioritized and the other is subordinately controlled to control the power conversion unit. Is very useful in system operation, and the present invention makes it possible to effectively limit the necessary current under the four-axis current command signal system. Less than,
The control unit 200, which is a main component thereof, will be described.
【００１７】２１０は、入力された４軸電流指令信号
Ｉ′ｐｄｒ、Ｉ′ｐｑｒ、Ｉ′ｎｄｒ、Ｉ′ｎｑｒに所
定の制限処理を施して４軸電流指令信号Ｉｐｄｒ、Ｉｐ
ｑｒ、Ｉｎｄｒ、Ｉｎｑｒを出力する４軸電流指令信号
演算手段で、その詳細は更に後述する。１１は電圧値検
出手段６により検出された電圧検出値を入力として交流
電力系統１の位相に同期した基準位相θを出力する基準
位相演算手段、２６は入力された４軸電流指令信号Ｉｐ
ｄｒ、Ｉｐｑｒ、Ｉｎｄｒ、Ｉｎｑｒと基準位相θとに
基づき各相電流指令信号Ｉａｒ、Ｉｂｒ、Ｉｃｒを出力
する電流指令信号変換手段としての各相電流指令信号演
算手段で、その詳細は更に後述する。The reference numeral 210 designates a 4-axis current command signal Ipdr, Ipdr, I'pqr, I'ndr, I'nqr to perform predetermined limiting processing on the input 4-axis current command signal Ipdr, I'nqr.
A four-axis current command signal calculating means for outputting qr, Indr, and Inqr, the details of which will be described later. Reference numeral 11 denotes a reference phase calculator which receives the voltage detection value detected by the voltage detector 6 as an input and outputs a reference phase θ synchronized with the phase of the AC power system 1, and 26 denotes an input four-axis current command signal Ip.
Each phase current command signal calculation means as current command signal conversion means for outputting each phase current command signal Iar, Ibr, Icr based on dr, Ipqr, Indr, Inqr and the reference phase θ, the details of which will be further described later.
【００１８】図２は４軸電流指令信号演算手段２１０の
詳細な構成例を示す図である。図において、２７は入力
信号Ｉ′ｐｄｒ、Ｉ′ｐｑｒ、Ｉ′ｎｄｒおよびＩ′ｎ
ｑｒに基づいて正相ｄ軸電流指令信号の上限値Ｍｐｄ、
正相ｑ軸電流指令信号の上限値Ｍｐｑ、逆相ｄ軸電流指
令信号の上限値Ｍｎｄおよび逆相ｑ軸電流指令信号の上
限値Ｍｎｑを出力する電流指令信号上限値演算手段であ
り、２８ａはＩ′ｐｄｒおよびＭｐｄを入力として上限
値をＭｐｄとし下限値を−Ｍｐｄとする正相ｄ軸電流指
令信号Ｉｐｄｒを出力する演算手段であり、２８ｂは
Ｉ′ｐｑｒおよびＭｐｑを入力として上限値をＭｐｑと
し下限値を−Ｍｐｑとする正相ｑ軸電流指令信号Ｉｐｑ
ｒを出力する演算手段であり、２８ｃはＩ′ｎｄｒおよ
びＭｎｄを入力として上限値をＭｎｄとし下限値を−Ｍ
ｎｄとする逆相ｄ軸電流指令信号Ｉｎｄｒを出力する演
算手段であり、２８ｄはＩ′ｎｑｒおよびＭｎｑを入力
として上限値をＭｎｑとし下限値を−Ｍｎｑとする逆相
ｑ軸電流指令信号Ｉｎｑｒを出力する演算手段である。FIG. 2 is a diagram showing a detailed configuration example of the four-axis current command signal calculating means 210. In the figure, reference numeral 27 denotes input signals I'pdr, I'pqr, I'ndr and I'n
The upper limit Mpd of the positive-phase d-axis current command signal based on qr,
A current command signal upper limit calculating means for outputting an upper limit Mpq of the positive-phase q-axis current command signal, an upper limit Mnd of the negative-phase d-axis current command signal, and an upper limit Mnq of the negative-phase q-axis current command signal. Calculation means for inputting I'pdr and Mpd as input and outputting a positive-phase d-axis current command signal Ipdr having an upper limit value of Mpd and a lower limit value of -Mpd, and 28b is an input device which receives I'pqr and Mpq and sets the upper limit value to Mpq. Positive-phase q-axis current command signal Ipq whose lower limit is -Mpq
The arithmetic means 28c outputs I′ndr and Mnd, sets the upper limit to Mnd, and sets the lower limit to −M.
The operation means 28d outputs a negative-phase d-axis current command signal Indr with nd as an input, and outputs a negative-phase q-axis current command signal Inqr with I′nqr and Mnq as inputs and an upper limit of Mnq and a lower limit of −Mnq. This is an operation means for outputting.
【００１９】なお、ここでは、４軸電流指令信号の内、
逆相成分Ｉ′ｎｄｒ、Ｉ′ｎｑｒを優先的に扱い、正相
成分Ｉ′ｐｄｒ、Ｉ′ｐｑｒを従属的に扱うものとす
る。従って、請求項にいう第１の電流指令信号制限手段
は、図２の電流指令信号上限値演算手段２７および演算
手段２８ｃ、２８ｄが相当し、第２の電流指令信号制限
手段は電流指令信号上限値演算手段２７および演算手段
２８ａ、２８ｂが相当する。Here, of the four-axis current command signals,
The antiphase components I'ndr and I'nqr are treated preferentially, and the positive phase components I'pdr and I'pqr are treated subordinately. Therefore, the first current command signal limiting means in the claims corresponds to the current command signal upper limit value calculating means 27 and the calculating means 28c and 28d in FIG. 2, and the second current command signal limiting means corresponds to the current command signal upper limit. The value calculating means 27 and the calculating means 28a and 28b correspond to this.
【００２０】次に図２の４軸電流指令信号演算手段２１
０の動作について説明する。４軸電流指令信号演算手段
２１０にはＩ′ｐｄｒ、Ｉ′ｐｑｒ、Ｉ′ｎｄｒおよび
Ｉ′ｎｑｒの４つの信号が供給される。まず電流指令信
号上限値演算手段２７において、正相ｄ軸電流指令信号
の上限値Ｍｐｄ、正相ｑ軸電流指令信号の上限値Ｍｐ
ｑ、逆相ｄ軸電流指令信号の上限値Ｍｎｄおよび逆相ｑ
軸電流指令信号の上限値Ｍｎｑが式（１）および式
（２）により算出される。Next, the four-axis current command signal calculating means 21 shown in FIG.
The operation of 0 will be described. The four-axis current command signal calculating means 210 is supplied with four signals I'pdr, I'pqr, I'ndr and I'nqr. First, the upper limit value Mpd of the positive-phase d-axis current command signal, the upper limit value Mp of the positive-phase q-axis current command signal,
q, upper limit Mnd of negative phase d-axis current command signal and negative phase q
The upper limit value Mnq of the shaft current command signal is calculated by equations (1) and (2).
【００２１】[0021]
【数１】 (Equation 1)
【００２２】[0022]
【数２】 (Equation 2)
【００２３】ただし、Ｉｍは電力変換部３が出力するこ
とができる最大電流のｄ−ｑ軸座標系における大きさで
ある。Here, Im is the magnitude of the maximum current that can be output by the power converter 3 in the dq axis coordinate system.
【００２４】図３は逆相ｄ軸電流指令信号の上限値Ｍｎ
ｄおよび逆相ｑ軸電流指令信号の上限値Ｍｎｑを算出す
るための方法である式（１）を説明するための図であ
る。図において、直交したＮｄ軸およびＮｑ軸はそれぞ
れ逆相電流のｄ軸成分を示す座標軸および逆相電流のｑ
軸成分を示す座標軸であり、Ｘｄは大きさがＩ′ｎｄｒ
に等しくかつＮｄ軸に沿ったベクトルであり、Ｘｑは大
きさがＩ′ｎｑｒに等しくかつＮｑ軸に沿ったベクトル
であり、ＸはベクトルＸｄとベクトルＸｑとを合成した
ベクトルであり、Ｉｍは電力変換部３が出力することが
できる最大の電流値の大きさを示すスカラー値であり、
Ｃは逆相座標系において原点Ｏを中心とし半径をＩｍと
する円弧であり、Ｘｍは向きがベクトルＸに等しくかつ
大きさがＩｍであるベクトルである。Ｘｍを逆相ｄ軸お
よび逆相ｑ軸に射影することにより、それぞれ逆相ｄ軸
電流指令信号上限値Ｍｎｄおよび逆相ｑ軸電流指令信号
上限値Ｍｎｑを算出する。これを算出する計算式が式
（１）である。FIG. 3 shows the upper limit Mn of the negative-phase d-axis current command signal.
FIG. 9 is a diagram for explaining equation (1), which is a method for calculating the upper limit Mnq of d and the negative-phase q-axis current command signal. In the figure, the orthogonal Nd axis and Nq axis are the coordinate axis indicating the d-axis component of the negative-phase current and the q
Xd is a coordinate axis indicating an axis component, and the magnitude is I'ndr
, And a vector along the Nd axis, Xq is a vector equal in magnitude to I′nqr and along the Nq axis, X is a vector obtained by combining the vector Xd and the vector Xq, and Im is a power A scalar value indicating the maximum current value that can be output by the converter 3;
C is an arc whose center is the origin O and whose radius is Im in the reversed-phase coordinate system, and Xm is a vector whose direction is equal to the vector X and whose size is Im. By projecting Xm on the negative-phase d-axis and the negative-phase q-axis, the negative-phase d-axis current command signal upper limit Mnd and the negative-phase q-axis current command signal upper limit Mnq are calculated, respectively. The equation for calculating this is equation (1).
【００２５】この方法により逆相ｄ軸電流指令信号上限
値Ｍｎｄおよび逆相ｑ軸電流指令信号上限値Ｍｎｑの大
きさを決定することにより、ＭｎｄとＭｎｑとの大きさ
の比は入力信号Ｉ′ｎｄｒとＩ′ｎｑｒとの比に等しく
なり、また出力される逆相電流の大きさはＩｍの値以下
に制限される。By determining the magnitudes of the negative-phase d-axis current command signal upper limit Mnd and the negative-phase q-axis current command signal upper limit Mnq according to this method, the ratio of the magnitude of Mnd to Mnq is determined by the input signal I '. ndr and I'nqr, and the magnitude of the output reverse-phase current is limited to the value of Im or less.
【００２６】図４は正相ｄ軸電流指令信号の上限値Ｍｐ
ｄおよび正相ｑ軸電流指令信号の上限値Ｍｐｑを算出す
るための方法である式（２）を説明するための図であ
る。図において、Ｎｄ軸、Ｎｑ軸、Ｘｄ、Ｘｑ、Ｘ、Ｉ
ｍ、ＯおよびＣについては図３と同等であるため説明を
省略する。直交したＰｄ軸およびＰｑ軸はそれぞれ図に
おける正相ｄ軸電流成分および正相ｑ軸電流成分を表す
軸であり、Ｐｄ軸とＰｑ軸によって表される座標の原点
は点Ｘである。Ｙｄは大きさがＩ′ｐｄｒに等しくかつ
方向がＰｄ軸に等しいベクトルであり、Ｙｑは大きさが
Ｉ′ｐｑｒに等しくかつ方向がＰｑ軸に等しいベクトル
であり、ＹはベクトルＹｄとベクトルＹｑを合成したベ
クトルであり、Ｃ１はＸを中心として円弧Ｃに内接する
円であり、Ｃ２はＸを中心として半径がベクトルＹの大
きさに等しい円であり、Ｙｍは向きがベクトルＹに等し
くかつ大きさが円Ｃ１の半径に等しいベクトルである。FIG. 4 shows the upper limit Mp of the positive-phase d-axis current command signal.
FIG. 9 is a diagram for explaining Expression (2), which is a method for calculating the upper limit Mpq of d and the positive-phase q-axis current command signal. In the figure, Nd axis, Nq axis, Xd, Xq, X, I
Since m, O and C are the same as those in FIG. 3, the description is omitted. The orthogonal Pd axis and Pq axis are the axes representing the positive-phase d-axis current component and the positive-phase q-axis current component in the figure, respectively, and the origin of the coordinates represented by the Pd axis and the Pq axis is a point X. Yd is a vector whose magnitude is equal to I'pdr and whose direction is equal to the Pd axis, Yq is a vector whose magnitude is equal to I'pqr and whose direction is equal to the Pq axis, and Y is the vector Yd and the vector Yq. C1 is a circle inscribed in the arc C about X, C2 is a circle about X in radius equal to the magnitude of the vector Y, and Ym is a circle in the direction equal to the vector Y and large in size. Is a vector equal to the radius of the circle C1.
【００２７】図４において、逆相座標系（Ｎｄ、Ｎｑ）
において正相座標系（Ｐｄ、Ｐｑ）は交流系統の周波数
の二倍の周波数で回転しており、もしＩ′ｐｄｒおよび
Ｉ′ｐｑｒがそれぞれ正相ｄ軸電流指令信号および正相
ｑ軸電流指令信号として電力変換装置の制御装置に入力
された場合、正相電流および逆相電流の合成された電流
の軌跡は逆相座標系において円Ｃ２で表されるものとな
り、Ｉ′ｐｄｒまたはＩ′ｐｑｒが大きくなったときに
は電力変換部３が出力できる最大の電流値Ｉｍを超過す
る可能性がある。これを防止するため、正相電流の指令
信号の大きさをＩｍを超えない値まで制限することと
し、つまり正相電流の指令信号を円Ｃ１の内側に制限す
る。この方法により正相電流の指令信号の最大はベクト
ルＹｍで表されるものとなり、ＹｍをＰｄ軸およびＰｑ
軸に射影することにより、それぞれ正相ｄ軸電流指令信
号上限値Ｍｐｄおよび正相ｑ軸電流指令信号上限値Ｍｐ
ｑを算出する。これを算出する計算式が式（２）であ
る。In FIG. 4, the reversed phase coordinate system (Nd, Nq)
, The positive-phase coordinate system (Pd, Pq) is rotating at twice the frequency of the AC system, and if I′pdr and I′pqr are the positive-phase d-axis current command signal and the positive-phase q-axis current command, respectively. When input as a signal to the control device of the power conversion device, the trajectory of the combined current of the positive-phase current and the negative-phase current is represented by a circle C2 in the negative-phase coordinate system, and I′pdr or I′pqr Is larger than the maximum current value Im that the power conversion unit 3 can output. To prevent this, the magnitude of the positive-phase current command signal is limited to a value not exceeding Im, that is, the positive-phase current command signal is limited to the inside of the circle C1. According to this method, the maximum of the positive-phase current command signal is represented by a vector Ym, and Ym is represented by the Pd axis and Pq
By projecting onto the axes, the positive-phase d-axis current command signal upper limit Mpd and the positive-phase q-axis current command signal upper limit Mp are respectively obtained.
Calculate q. The equation for calculating this is equation (2).
【００２８】この方法により正相ｄ軸電流指令信号上限
値Ｍｐｄおよび正相ｑ軸電流指令信号上限値Ｍｐｑの大
きさを決定することにより、ＭｐｄとＭｐｑとの大きさ
の比は入力信号Ｉ′ｐｄｒとＩ′ｐｑｒとの比に等しく
なり、また出力される電流指令信号は例えば最大で（Ｘ
＋Ｙｍ）で表されるベクトルとなり、Ｉｍの値以下に制
限される。なお、√（Ｉ′ｎｄｒ2＋Ｉ′ｎｑｒ2）＞Ｉ
ｍの場合は、従属的に処理される正相成分は、出力でき
る余地がないので、その上限値Ｍｐｄ、Ｍｐｑは共に０
とされる。By determining the magnitudes of the positive-phase d-axis current command signal upper limit value Mpd and the positive-phase q-axis current command signal upper limit value Mpq by this method, the ratio of the magnitude of Mpd to Mpq is determined by the input signal I '. pdr and I'pqr, and the output current command signal is, for example, (X
+ Ym), which is limited to the value of Im or less. Note that {(I'ndr 2 + I'nqr 2 )> I
In the case of m, there is no room for the output of the normal phase component to be processed dependently, so that the upper limit values Mpd and Mpq are both 0.
It is said.
【００２９】演算手段２８ａはＩ′ｐｄｒとＭｐｄを入
力として式（３ａ）により算出される正相ｄ軸電流指令
信号Ｉｐｄｒを出力し、演算手段２８ｂはＩ′ｐｑｒお
よびＭｐｑを入力として式（３ｂ）により算出される正
相ｑ軸電流指令信号Ｉｐｑｒを出力し、演算手段２８ｃ
はＩ′ｎｄｒおよびＭｎｄを入力として式（３ｃ）によ
り算出される逆相ｄ軸電流指令信号Ｉｎｄｒを出力と
し、演算手段２８ｄはＩ′ｎｑｒおよびＭｎｑを入力と
して式（３ｄ）により算出される逆相ｑ軸電流指令信号
Ｉｎｑｒを出力する。The arithmetic means 28a receives I'pdr and Mpd as inputs and outputs a positive-phase d-axis current command signal Ipdr calculated by the equation (3a), and the arithmetic means 28b receives I'pqr and Mpq as inputs and outputs the equation (3b ), And outputs the positive-phase q-axis current command signal Ipqr.
Is a negative-phase d-axis current command signal Indr calculated by the equation (3c) using I'ndr and Mnd as inputs, and an arithmetic unit 28d receives I'nqr and Mnq as inputs and calculates the inverse phase calculated by equation (3d). It outputs a phase q-axis current command signal Inqr.
【００３０】[0030]
【数３】 (Equation 3)
【００３１】図５は各相電流指令信号演算手段２６の詳
細な構成例を示す図である。図において、３０ａは式
（４）により、ＩｐｄｒとＩｐｑｒを交流電力系統１の
位相であるθだけ回転させた後、回転後の二軸（α、β
軸）を正相三相成分Ｉｐａｒ、Ｉｐｂｒ、Ｉｐｃｒに変
換する演算手段であり、３０ｂは式（５）により、Ｉｎ
ｄｒとＩｎｑｒを交流電力系統１の位相と逆回転となる
−θだけ回転させた後、回転後の二軸を逆相三相成分Ｉ
ｎａｒ、Ｉｎｂｒ、Ｉｎｂｒに変換する演算手段であ
り、３１ａ〜３１ｃはそれぞれＩｐａｒとＩｎａｒの
和、ＩｐｂｒとＩｎｂｒの和およびＩｐｃｒとＩｎｃｒ
の和を計算し、それぞれ各相の電流指令信号Ｉａｒ、Ｉ
ｂｒおよびＩｃｒとして出力する加算手段である。FIG. 5 is a diagram showing a detailed configuration example of each phase current command signal calculating means 26. In the figure, 30a is obtained by rotating Ipdr and Ipqr by θ which is the phase of the AC power system 1 according to equation (4), and then rotating the two axes (α, β).
Axis) is converted into positive-phase three-phase components Ipar, Ipbr, and Ipcr.
After rotating dr and Inqr by −θ, which is the reverse rotation of the phase of the AC power system 1, the two axes after rotation are inverted to the three-phase component I.
arithmetic means for converting nar, Inbr, and Inbr; 31a to 31c denote the sum of Ipar and Inar, the sum of Ipbr and Inbr, and the sum of Ipcr and Incr, respectively;
, And the current command signals Iar, I
It is an adding means for outputting as br and Icr.
【００３２】[0032]
【数４】 (Equation 4)
【００３３】[0033]
【数５】 (Equation 5)
【００３４】図１に戻り、各相電流指令信号演算手段２
６は４軸電流指令信号演算手段２１０より出力されるＩ
ｐｄｒ、Ｉｐｑｒ、ＩｎｄｒおよびＩｎｑｒならびに基
準位相演算手段１１が出力する基準位相θを入力とし、
各相の（基準）電流指令信号であるＩａｒ、Ｉｂｒおよ
びＩｃｒを出力する。電流値検出手段７は交流電力系統
１と変圧器２を接続する連系線路に流れる各相の電流Ｉ
ａ、ＩｂおよびＩｃを検出し、基準電流検出信号として
制御手段２３ａ〜２３ｃへ出力する。（第１の）制御手
段２３ａはＩａおよびＩａｒを入力としてＩａがＩａｒ
に追従するための相電圧指令信号Ｖａｉを生成して演算
手段１５へ出力し、制御手段２３ｂはＩｂおよびＩｂｒ
を入力としてＩｂがＩｂｒに追従するための相電圧指令
信号Ｖｂｉを生成して演算手段１５へ出力し、制御手段
２３ｃはＩｃおよびＩｃｒを入力としてＩｃがＩｃｒに
追従するための相電圧指令信号Ｖｃｉを生成して演算手
段１５へ出力する。第２の制御手段である演算手段１５
は入力された相電圧指令信号Ｖａｉ、ＶｂｉおよびＶｃ
ｉを入力として電力変換部３がそれぞれの相電圧指令信
号で示された電圧値を出力するための制御信号を生成
し、電力変換部３へ出力する。Returning to FIG. 1, each phase current command signal calculating means 2
6 is I output from the 4-axis current command signal calculating means 210
pdr, Ipqr, Indr and Inqr and the reference phase θ output by the reference phase calculating means 11 are input,
It outputs Iar, Ibr and Icr which are (reference) current command signals of each phase. The current value detecting means 7 detects the current I of each phase flowing through the interconnection line connecting the AC power system 1 and the transformer 2.
a, Ib and Ic are detected and output to the control means 23a to 23c as a reference current detection signal. The (first) control means 23a receives Ia and Iar as inputs and
And outputs the phase voltage command signal Vai to the arithmetic means 15 so as to follow Ib and Ibr.
Is input to generate a phase voltage command signal Vbi for Ib to follow Ibr and output it to the calculating means 15, and the control means 23c receives Ic and Icr as input and outputs a phase voltage command signal Vci for Ic to follow Icr. Is generated and output to the calculating means 15. Arithmetic means 15 as second control means
Are the input phase voltage command signals Vai, Vbi and Vc
Using i as an input, the power conversion unit 3 generates a control signal for outputting a voltage value indicated by each phase voltage command signal, and outputs the control signal to the power conversion unit 3.
【００３５】このようにして、電力変換装置は入力され
た信号に応じた正相ｄ軸電流、正相ｑ軸電流、逆相ｄ軸
電流および逆相ｑ軸電流を出力する。As described above, the power converter outputs a positive-phase d-axis current, a positive-phase q-axis current, a negative-phase d-axis current, and a negative-phase q-axis current according to the input signal.
【００３６】以上のように、この実施の形態によれば、
４軸電流指令信号Ｉ′ｐｄｒ、Ｉ′ｐｑｒ、Ｉ′ｎｄｒ
およびＩ′ｎｑｒを入力することにより、電力変換装置
は出力する正相ｄ軸電流、正相ｑ軸電流、逆相ｄ軸電流
および逆相ｑ軸電流を個別に制御することができ、かつ
Ｉ′ｐｄｒ、Ｉ′ｐｑｒ、Ｉ′ｎｄｒおよびＩ′ｎｑｒ
によって指令される電流値が変換器の出力可能な電流値
を超える場合には逆相電流を優先して出力し、その上で
可能な限りの正相電流を出力することができる、という
効果が得られる。As described above, according to this embodiment,
4-axis current command signals I'pdr, I'pqr, I'ndr
And I′nqr, the power converter can individually control the output positive-phase d-axis current, positive-phase q-axis current, negative-phase d-axis current, and negative-phase q-axis current, and 'Pdr, I'pqr, I'ndr and I'nqr
If the current value commanded by the converter exceeds the current value that can be output from the converter, priority is given to outputting the negative-phase current, and then the positive-phase current can be output as much as possible. can get.
【００３７】なお、例えば以上の方法において正相座標
系を基準に考えることにより正相電流を優先的に出力
し、電力変換部の出力可能な電流に余裕があればその範
囲内で逆相電流を出力する制御方式を用いることも可能
である。In the above method, for example, by considering the positive-phase coordinate system as a reference, the positive-phase current is preferentially output. May be used.
【００３８】実施の形態２．図６はこの発明の実施の形
態２における電力変換装置を示す構成図である。この形
態２は、従来の図８で示した制御部１００の構成を活用
しつつ本願発明を適用したものである。４軸電流指令信
号演算手段２１０の部分は、先の実施の形態１と同一で
あるので、ここでは異なる部分についてのみ説明する。Embodiment 2 FIG. 6 is a configuration diagram showing a power conversion device according to Embodiment 2 of the present invention. In the second embodiment, the present invention is applied while utilizing the configuration of the control unit 100 shown in FIG. Since the part of the four-axis current command signal calculating means 210 is the same as that of the first embodiment, only different parts will be described here.
【００３９】各軸電流指令信号演算手段１２６は、式
（６）により、４軸電流指令信号演算手段２１０より出
力されるＩｐｄｒ、Ｉｐｑｒ、ＩｎｄｒおよびＩｎｑｒ
ならびに基準位相演算手段１１が出力する基準位相θを
入力とし、ｄ軸電流指令信号Ｉｄｒおよびｑ軸電流指令
信号Ｉｑｒを出力する。Each axis current command signal calculating means 126 calculates Ipdr, Ipqr, Indr and Inqr output from four-axis current command signal calculating means 210 according to equation (6).
The reference phase calculation means 11 receives the reference phase θ as an input, and outputs a d-axis current command signal Idr and a q-axis current command signal Iqr.
【００４０】[0040]
【数６】 (Equation 6)
【００４１】１２は電流検出信号変換手段としての電流
成分演算手段で、式（７）により、電流値検出手段７が
出力する電流検出信号Ｉおよび基準位相演算手段１１が
出力する基準位相θを入力として、ｄ軸電流検出信号Ｉ
ｄおよびｑ軸電流検出信号Ｉｑを出力する。Numeral 12 denotes a current component calculating means as a current detecting signal converting means, which inputs the current detecting signal I outputted by the current value detecting means 7 and the reference phase θ outputted by the reference phase calculating means 11 according to equation (7). As the d-axis current detection signal I
It outputs d and q axis current detection signals Iq.
【００４２】[0042]
【数７】 (Equation 7)
【００４３】そして、制御手段１３ａはＩｄおよびＩｄ
ｒを入力としてＩｄがＩｄｒに追従するためのｄ軸電圧
指令信号Ｖｄｉを生成して演算手段１４へ出力し、制御
手段１３ｂはＩｑおよびＩｑｒを入力としてＩｑがＩｑ
ｒに追従するためのｑ軸電圧指令信号Ｖｑｉを生成して
演算手段１４へ出力する。演算手段１４は、式（８）に
より、制御手段１３ａ、１３ｂより出力されるＶｄｉ、
Ｖｑｉおよび基準位相演算手段１１が出力する基準位相
θを入力とし、相電圧指令信号Ｖａｉ、ＶｂｉおよびＶ
ｃｉを出力する。The control means 13a outputs Id and Id
With r as an input, a d-axis voltage command signal Vdi for Id to follow Idr is generated and output to the arithmetic means 14. The control means 13b receives Iq and Iqr as inputs and Iq becomes Iq.
A q-axis voltage command signal Vqi for following r is generated and output to the calculating means. The calculation means 14 calculates Vdi, which is output from the control means 13a and 13b, according to equation (8).
Vqi and the reference phase θ output by the reference phase calculation means 11 are input, and the phase voltage command signals Vai, Vbi and V
output ci.
【００４４】[0044]
【数８】 (Equation 8)
【００４５】演算手段１５は入力された相電圧指令信号
Ｖａｉ、ＶｂｉおよびＶｃｉを入力として電力変換部３
がそれぞれ相電圧指令信号で示された電圧値を出力する
ための制御信号を生成し、電力変換部３へ出力する。The computing means 15 receives the input phase voltage command signals Vai, Vbi and Vci as inputs and outputs
Generates a control signal for outputting a voltage value indicated by the phase voltage command signal, and outputs the control signal to the power conversion unit 3.
【００４６】以上のように、この形態２では、形態１の
場合と同様、４軸電流指令信号の正相、逆相のいずれか
一方を優先、他方を従属の扱いとして、電力変換部３の
許容し得る最大電流の範囲で可能な限りの出力電流が得
られる制御が可能となるとともに、ｄ軸、ｑ軸電流を直
接それぞれの指令値に追従させる制御が可能となる。As described above, in the second embodiment, as in the first embodiment, one of the positive phase and the negative phase of the four-axis current command signal is given priority and the other is treated as subordinate, and the power conversion unit 3 It is possible to control to obtain the maximum possible output current within the allowable maximum current range, and to control the d-axis and q-axis currents to directly follow the respective command values.
【００４７】実施の形態３．図７はこの発明の実施の形
態３における電力変換装置を示す構成図である。先の形
態例と異なる部分についてのみ以下に説明する。制御部
３００内の電流成分演算手段３１２は、式（９）によ
り、電流値検出手段７が出力する電流検出信号Ｉおよび
基準位相演算手段１１が出力する基準位相θを入力とし
て、正相ｄ軸電流検出信号Ｉｐｄ、正相ｑ軸電流検出信
号、逆相ｄ軸電流検出信号Ｉｎｄおよび逆相ｑ軸電流検
出信号Ｉｎｑを出力する。Embodiment 3 FIG. 7 is a configuration diagram showing a power conversion device according to Embodiment 3 of the present invention. Only the differences from the above embodiment will be described below. The current component calculation means 312 in the control unit 300 receives the current detection signal I output from the current value detection means 7 and the reference phase θ output from the reference phase calculation means 11 as inputs using the equation (9). It outputs a current detection signal Ipd, a positive-phase q-axis current detection signal, a negative-phase d-axis current detection signal Ind, and a negative-phase q-axis current detection signal Inq.
【００４８】[0048]
【数９】 (Equation 9)
【００４９】ただし、ここでＦ（ｓ）は各信号成分の直
流成分を取り出し、θの角周波数の二倍成分を十分に小
さくする、フィルタや移動平均などの適当な演算手段で
ある。Here, F (s) is a suitable arithmetic means such as a filter or a moving average for extracting the DC component of each signal component and sufficiently reducing the double component of the angular frequency of θ.
【００５０】そして、制御手段３１３ａはＩｐｄおよび
Ｉｐｄｒを入力としてＩｐｄがＩｐｄｒに追従するため
の正相ｄ軸電圧指令信号Ｖｐｄｉを生成して演算手段３
１４へ出力し、制御手段３１３ｂはＩｐｑおよびＩｐｑ
ｒを入力としてＩｐｑがＩｐｑｒに追従するための正相
ｑ軸電圧指令信号Ｖｐｑｉを生成して演算手段３１４へ
出力し、制御手段３１３ｃはＩｎｄおよびＩｎｄｒを入
力としてＩｎｄがＩｎｄｒに追従するための逆相ｄ軸電
圧指令信号Ｖｎｄｉを生成して演算手段３１４へ出力
し、制御手段３１３ｄはＩｎｑおよびＩｎｑｒを入力と
してＩｎｑがＩｎｑｒに追従するための逆相ｑ軸電圧指
令信号Ｖｎｑｉを演算手段３１４へ出力する。The control means 313a receives Ipd and Ipdr as inputs, generates a positive-phase d-axis voltage command signal Vpdi for Ipd to follow Ipdr, and
14 and the control means 313b outputs Ipq and Ipq
With r as an input, a positive-phase q-axis voltage command signal Vpqi for Ipq to follow Ipqr is generated and output to the arithmetic means 314, and the control means 313c receives Ind and Indr as inputs and performs a reverse operation for Ind to follow Indr. A phase d-axis voltage command signal Vndi is generated and output to the calculating means 314, and the control means 313d receives the Inq and Inqr as inputs and outputs a negative-phase q-axis voltage command signal Vnqi for the Inq to follow Inqr to the calculating means 314. I do.
【００５１】演算手段３１４は、式（１０）により、制
御手段３１３ａ〜３１３ｄより出力されるＶｐｄｉ、Ｖ
ｐｑｉ、ＶｎｄｉおよびＶｎｑｉならびに基準位相演算
手段１１が出力する基準位相θを入力とし、相電圧指令
信号Ｖａｉ、ＶｂｉおよびＶｃｉを出力する。The calculating means 314 calculates Vpdi, Vp output from the control means 313a to 313d according to the equation (10).
pqi, Vndi and Vnqi and the reference phase θ output by the reference phase calculation means 11 are input, and phase voltage command signals Vai, Vbi and Vci are output.
【００５２】[0052]
【数１０】 (Equation 10)
【００５３】演算手段１５は入力された相電圧指令信号
Ｖａｉ、ＶｂｉおよびＶｃｉを入力として電力変換部３
がそれぞれ相電圧指令信号で示された電圧値を出力する
ための制御信号を生成し、電力変換部３へ出力する。The calculating means 15 receives the input phase voltage command signals Vai, Vbi and Vci as inputs and outputs the power
Generates a control signal for outputting a voltage value indicated by the phase voltage command signal, and outputs the control signal to the power conversion unit 3.
【００５４】以上のように、この形態３においても、４
軸電流指令信号の正相、逆相のいずれか一方を優先、他
方を従属の扱いとして、電力変換部３の許容し得る最大
電流の範囲で可能な限りの出力電流が得られる制御が可
能となるとともに、正相、逆相の各ｄ軸、ｑ軸電流を直
接それぞれの指令値に追従させる制御が可能となる。As described above, in the third embodiment as well,
It is possible to control such that one of the positive phase and the negative phase of the shaft current command signal is prioritized and the other is dependent, so that the output current can be obtained as much as possible within the maximum allowable current of the power conversion unit 3. At the same time, it becomes possible to control the d-axis and q-axis currents of the positive and negative phases to directly follow the respective command values.
【００５５】なお、上記各実施の形態では、第２の電力
系統として直流電圧源の場合を示したが、直流に限らず
他の種別の電力系統であっても、それに見合う電力変換
部３を備えた電力変換装置に、この発明は同様に適用す
ることができ同等の効果を奏する。In each of the above-described embodiments, the case where a DC voltage source is used as the second power system has been described. The present invention can be similarly applied to a power conversion device provided with the same effect.
【００５６】[0056]
【発明の効果】以上のように、この発明に係る電力変換
装置は、多相交流の第１の電力系統と、第２の電力系統
との間に接続され上記両系統間で電力の変換を行う電力
変換部、およびこの電力変換部の上記第１の電力系統側
の電流に関し、回転座標系のｄ軸電流およびｑ軸電流を
更にそれぞれ正相分と逆相分とに区分してなる４軸電流
指令信号を入力して上記電力変換部を制御する制御部を
備えた電力変換装置において、上記電力変換部の電流の
大きさが所定の許容電流値を越えないように、上記４軸
電流指令信号の内、正相分または逆相分のいずれか一方
の２軸電流指令信号に制限を加える第１の電流指令信号
制限手段、およびこの第１の電流指令信号制限手段を経
た、上記正相分または逆相分のいずれか一方の２軸電流
指令信号の存在を前提に上記電力変換部の電流の大きさ
が上記所定の許容電流値を越えないように、上記４軸電
流指令信号の内、正相分または逆相分のいずれか他方の
２軸電流指令信号に制限を加える第２の電流指令信号制
限手段を備えたので、４軸電流指令信号の内、正相分ま
た逆相分のいずれか一方を優先、他方を従属に扱う場
合、出力電流が所定の許容電流値を超えることがない、
良好な電流制御運転が実現される。As described above, the power converter according to the present invention is connected between the first power system and the second power system of the polyphase alternating current and converts the power between the two systems. Regarding the power conversion unit to be performed and the current on the first power system side of the power conversion unit, the d-axis current and the q-axis current of the rotating coordinate system are further divided into a positive phase component and a negative phase component, respectively. In the power conversion device provided with a control unit for controlling the power conversion unit by inputting a shaft current command signal, the four-axis current is controlled so that the current of the power conversion unit does not exceed a predetermined allowable current value. Among the command signals, a first current command signal limiting means for limiting either the positive-phase component or the negative-phase two-axis current command signal, and the positive current command signal limiting means via the first current command signal limiting means. Check for the presence of either the two-axis current command signal for the In addition, in order to prevent the magnitude of the current of the power conversion unit from exceeding the predetermined allowable current value, of the four-axis current command signals, the other two-axis current command signals of the positive phase component or the negative phase component are used. The current command signal limiting means for limiting the output current of the four-axis current command signal, if one of the positive phase component and the negative phase component is given priority and the other is dependent, Does not exceed the allowable current value of
Good current control operation is realized.
【００５７】また、この発明に係る電力変換装置は、そ
の電力変換部の第１の電力系統側における所定の許容電
流値をＩｍ、４軸電流指令信号の内、正相分または逆相
分のいずれか一方の２軸電流指令信号をＩ１ｄおよびＩ
１ｑ、同じくいずれか他方の２軸電流指令信号をＩ２ｄ
およびＩ２ｑとした場合、第１の電流指令信号制限手段
は、ｄ軸電流指令信号Ｉ１ｄが所定のＭ１ｄ（上限値）
を越えるときはＭ１ｄを、−Ｍ１ｄ（下限値）未満のと
きは−Ｍ１ｄを、そしてＭ１ｄ〜−Ｍ１ｄのときはＩ１
ｄそのままを、それぞれ出力する第１のｄ軸電流指令信
号制限手段、およびｑ軸電流指令信号Ｉ１ｑが所定のＭ
１ｑ（上限値）を越えるときはＭ１ｑを、−Ｍ１ｑ（下
限値）未満のときは−Ｍ１ｑを、そしてＭ１ｑ〜−Ｍ１
ｑのときはＩ１ｑそのままを、それぞれ出力する第１の
ｑ軸電流指令信号制限手段を備え、第２の電流指令信号
制限手段は、ｄ軸電流指令信号Ｉ２ｄが所定のＭ２ｄ
（上限値）を越えるときはＭ２ｄを、−Ｍ２ｄ（下限
値）未満のときは−Ｍ２ｄを、そしてＭ２ｄ〜−Ｍ２ｄ
のときはＩ２ｄそのままを、それぞれ出力する第２のｄ
軸電流指令信号制限手段、およびｑ軸電流指令信号Ｉ２
ｑが所定のＭ２ｑ（上限値）を越えるときはＭ２ｑを、
−Ｍ２ｑ（下限値）未満のときは−Ｍ２ｑを、そしてＭ
２ｑ〜−Ｍ２ｑのときはＩ２ｑそのままを、それぞれ出
力する第２のｑ軸電流指令信号制限手段を備えたので、
出力電流を所定の許容電流値の範囲に抑えるための各電
流指令信号の制限処理が確実になされる。In the power converter according to the present invention, the predetermined permissible current value on the first power system side of the power conversion unit is set to Im or 4-phase current command signal for the positive phase or the negative phase. Either one of the two-axis current command signals is
1q, the other two-axis current command signal is also I2d
And I2q, the first current command signal limiting means sets the d-axis current command signal I1d to a predetermined M1d (upper limit).
Is exceeded, M1d is set when -M1d (lower limit) is less than -M1d, and when M1d to -M1d is set to I1d.
d, the first d-axis current command signal limiting means for outputting the signal as it is, and the q-axis current command signal I1q
M1q when exceeding 1q (upper limit), -M1q when less than -M1q (lower limit), and M1q to -M1
In the case of q, there is provided first q-axis current command signal limiting means for respectively outputting I1q as it is, and the second current command signal limiting means is adapted to output the d-axis current command signal I2d to a predetermined M2d
M2d when exceeding (upper limit), -M2d when less than -M2d (lower limit), and M2d to -M2d.
In the case of the second d
Axis current command signal limiting means, and q-axis current command signal I2
When q exceeds a predetermined M2q (upper limit), M2q is used.
If less than -M2q (lower limit), -M2q and M
In the case of 2q to -M2q, since the second q-axis current command signal limiting means for outputting I2q as it is is provided,
Limitation processing of each current command signal for suppressing the output current within a predetermined allowable current value range is reliably performed.
【００５８】また、この発明に係る電力変換装置は、そ
の第１および第２の電流指令信号制限手段を経た４軸電
流指令信号を基準形態の各基準電流指令信号に変換する
電流指令信号変換手段、電力変換部の第１の電力系統側
の電流検出値を上記基準形態の各基準電流検出信号に変
換する電流検出信号変換手段、上記各基準電流指令信号
と各基準電流検出信号とがそれぞれ一致するように上記
各両信号の偏差に基づき各相電圧指令信号を出力する第
１の制御手段、および上記各相電圧指令信号に基づき上
記電力変換部の出力電圧を制御する第２の制御手段を備
えたので、電力変換部の出力電流を制限処理された電流
指令信号に確実に追従させる制御が可能となる。Further, the power converter according to the present invention has a current command signal converting means for converting the four-axis current command signal passed through the first and second current command signal limiting means into each reference current command signal in a reference form. Current detection signal converting means for converting a current detection value on the first power system side of the power conversion unit into each of the reference current detection signals in the above-mentioned reference form; First control means for outputting each phase voltage command signal based on the deviation between the two signals, and second control means for controlling the output voltage of the power conversion unit based on each phase voltage command signal. With this configuration, it is possible to control the output current of the power conversion unit to reliably follow the current command signal subjected to the limiting process.
【００５９】また、この発明に係る電力変換装置の電流
指令信号変換手段は、第１の電力系統の３相交流電圧か
ら基準位相を検出してこの基準位相に基づき４軸電流指
令信号を３相基準電流指令信号に変換し、電流検出信号
変換手段は、電力変換部の上記第１の電力系統側の電流
検出値を３相基準電流検出信号として出力するので、電
力変換部の３相各相電流を直接それぞれの指令値に追従
させる制御が可能となる。Further, the current command signal converting means of the power converter according to the present invention detects a reference phase from the three-phase AC voltage of the first power system, and converts the four-axis current command signal into three phases based on the reference phase. The current conversion signal is converted into a reference current command signal, and the current detection signal conversion means outputs the current detection value on the first power system side of the power conversion unit as a three-phase reference current detection signal. It is possible to control the current to directly follow the respective command values.
【００６０】また、この発明に係る電力変換装置の電流
指令信号変換手段は、第１の電力系統の３相交流電圧か
ら基準位相を検出してこの基準位相に基づき４軸電流指
令信号をｄ−ｑ２軸基準電流指令信号に変換し、電流検
出信号変換手段は、電力変換部の上記第１の電力系統側
の電流検出値を上記基準位相に基づきｄ−ｑ２軸基準電
流検出信号に変換するので、電力変換部のｄ軸、ｑ軸電
流を直接それぞれの指令値に追従させる制御が可能とな
る。Further, the current command signal conversion means of the power converter according to the present invention detects a reference phase from the three-phase AC voltage of the first power system, and outputs a four-axis current command signal based on the reference phase. Since the current detection value is converted into a q2-axis reference current command signal, and the current detection signal conversion means converts the current detection value on the first power system side of the power conversion section into a dq2-axis reference current detection signal based on the reference phase. Thus, it is possible to control the d-axis and q-axis currents of the power converter to directly follow the respective command values.
【００６１】また、この発明に係る電力変換装置の電流
指令信号変換手段は、第１および第２の電流指令信号制
限手段を経た４軸電流指令信号を４軸基準電流指令信号
として出力し、電流検出信号変換手段は、第１の電力系
統の３相交流電圧から基準位相を検出し、電力変換部の
上記第１の電力系統側の電流検出値を上記基準位相に基
づき４軸基準電流検出信号に変換するので、電力変換部
の正相、逆相の各ｄ軸、ｑ軸電流を直接それぞれの指令
値に追従させる制御が可能となる。The current command signal converting means of the power converter according to the present invention outputs the four-axis current command signal passed through the first and second current command signal limiting means as a four-axis reference current command signal. The detection signal conversion means detects a reference phase from the three-phase AC voltage of the first power system, and converts a current detection value of the power conversion unit on the first power system side into a four-axis reference current detection signal based on the reference phase. Therefore, it is possible to control the d-axis and q-axis currents of the positive and negative phases of the power conversion unit to directly follow the respective command values.
【図１】 この発明の実施の形態１における電力変換装
置を示す構成図である。FIG. 1 is a configuration diagram illustrating a power conversion device according to Embodiment 1 of the present invention.
【図２】 図１における４軸電流指令信号演算手段２１
０の詳細な構成を示すブロック図である。FIG. 2 is a diagram showing a four-axis current command signal calculating unit 21 in FIG.
FIG. 2 is a block diagram showing a detailed configuration of the 0 ’.
【図３】 図２において、逆相成分電流指令信号上限値
の算出方法を説明するためのベクトル図である。FIG. 3 is a vector diagram for explaining a method of calculating the upper limit value of the negative phase component current command signal in FIG.
【図４】 図２において、正相成分電流指令信号上限値
の算出方法を説明するためのベクトル図である。FIG. 4 is a vector diagram for explaining a method of calculating a positive-phase component current command signal upper limit value in FIG. 2;
【図５】 図１における各相電流指令信号演算手段２６
の詳細な構成を示すブロック図である。FIG. 5 shows each phase current command signal calculating means 26 in FIG.
FIG. 3 is a block diagram showing a detailed configuration of FIG.
【図６】 この発明の実施の形態２における電力変換装
置を示す構成図である。FIG. 6 is a configuration diagram showing a power conversion device according to Embodiment 2 of the present invention.
【図７】 この発明の実施の形態３における電力変換装
置を示す構成図である。FIG. 7 is a configuration diagram illustrating a power conversion device according to Embodiment 3 of the present invention.
【図８】 従来の電力変換装置を示す構成図である。FIG. 8 is a configuration diagram showing a conventional power converter.
１ 交流電力系統、３ 電力変換部、５ 直流電圧源、
６ 電圧値検出手段、７ 電流値検出手段、１１ 基準
位相演算手段、１２ 電流成分演算手段、１３ａ，１３
ｂ 制御手段、１４，１５ 演算手段、２３ａ〜２３ｃ
制御手段、２６ 各相電流指令信号演算手段、２７
電流指令信号上限値演算手段、２８ａ〜２８ｄ 演算手
段、３０ａ，３０ｂ 演算手段、３１ａ〜３１ｃ 加算
手段、１００，２００，３００ 制御部、１２６ 各軸
電流指令信号演算手段、２１０ ４軸電流指令信号演算
手段、３１２ 電流成分演算手段、３１３ａ〜３１３ｄ
制御手段、３１４ 演算手段、Ｉ′ｐｄｒ，Ｉｐｄｒ
正相ｄ軸電流指令信号、Ｉ′ｐｑｒ，Ｉｐｑｒ 正相
ｑ軸電流指令信号、Ｉ′ｎｄｒ，Ｉｎｄｒ 逆相ｄ軸電
流指令信号、Ｉ′ｎｑｒ，Ｉｎｑｒ 逆相ｑ軸電流指令
信号、Ｖａｉ，Ｖｂｉ，Ｖｃｉ 各相電圧指令信号、θ
基準位相。1 AC power system, 3 power converter, 5 DC voltage source,
6 voltage value detecting means, 7 current value detecting means, 11 reference phase calculating means, 12 current component calculating means, 13a, 13
b control means, 14, 15 arithmetic means, 23a to 23c
Control means, 26 each phase current command signal calculating means, 27
Current command signal upper limit value calculation means, 28a-28d calculation means, 30a, 30b calculation means, 31a-31c addition means, 100, 200, 300 control section, 126 axis current command signal calculation means, 210 4-axis current command signal calculation Means, 312 current component calculating means, 313a to 313d
Control means, 314 arithmetic means, I'pdr, Ipdr
Positive-phase d-axis current command signal, I'pqr, Ipqr Positive-phase q-axis current command signal, I'ndr, Indr Negative-phase d-axis current command signal, I'nqr, Inqr Negative-phase q-axis current command signal, Vai, Vbi , Vci for each phase voltage command signal, θ
Reference phase.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 玉井 伸三 東京都千代田区丸の内二丁目２番３号 三 菱電機株式会社内 Ｆターム(参考） 5G066 FA01 FB13 FC12 HA19 HA30 HB05 5H006 CA05 CA12 CA13 CB01 CB08 CC02 DA02 DA04 DC02 DC04 DC05 5H007 CA05 CB04 CB05 CC23 DA03 DA05 DC02 DC04 DC05 EA02 FA03 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinzo Tamai 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term within Mitsubishi Electric Corporation (reference) 5G066 FA01 FB13 FC12 HA19 HA30 HB05 5H006 CA05 CA12 CA13 CB01 CB08 CC02 DA02 DA04 DC02 DC04 DC05 5H007 CA05 CB04 CB05 CC23 DA03 DA05 DC05 DC02 DC04 DC05 EA02 FA03
Claims (6)
力系統との間に接続され上記両系統間で電力の変換を行
う電力変換部、およびこの電力変換部の上記第１の電力
系統側の電流に関し、回転座標系のｄ軸電流およびｑ軸
電流を更にそれぞれ正相分と逆相分とに区分してなる４
軸電流指令信号を入力して上記電力変換部を制御する制
御部を備えた電力変換装置において、 上記電力変換部の電流の大きさが所定の許容電流値を越
えないように、上記４軸電流指令信号の内、正相分また
は逆相分のいずれか一方の２軸電流指令信号に制限を加
える第１の電流指令信号制限手段、およびこの第１の電
流指令信号制限手段を経た、上記正相分または逆相分の
いずれか一方の２軸電流指令信号の存在を前提に上記電
力変換部の電流の大きさが上記所定の許容電流値を越え
ないように、上記４軸電流指令信号の内、正相分または
逆相分のいずれか他方の２軸電流指令信号に制限を加え
る第２の電流指令信号制限手段を備えたことを特徴とす
る電力変換装置。1. A power converter connected between a first power system of multi-phase alternating current and a second power system and configured to convert power between the two systems, and a first power converter of the power converter. , The d-axis current and the q-axis current of the rotating coordinate system are further divided into a positive phase component and a negative phase component, respectively.
In a power converter having a control unit for inputting a shaft current command signal and controlling the power conversion unit, the four-axis current is controlled so that the current of the power conversion unit does not exceed a predetermined allowable current value. Among the command signals, a first current command signal limiting means for limiting either the positive-phase component or the negative-phase two-axis current command signal, and the positive current command signal limiting means via the first current command signal limiting means. On the premise of the presence of any one of the two-axis current command signals for the phase component and the negative phase component, the four-axis current command signal is controlled so that the magnitude of the current of the power converter does not exceed the predetermined allowable current value. And a second current command signal limiting means for limiting the other two-axis current command signal of the positive phase or the negative phase.
所定の許容電流値をＩｍ、４軸電流指令信号の内、正相
分または逆相分のいずれか一方の２軸電流指令信号をＩ
１ｄおよびＩ１ｑ、同じくいずれか他方の２軸電流指令
信号をＩ２ｄおよびＩ２ｑとした場合、 第１の電流指令信号制限手段は、ｄ軸電流指令信号Ｉ１
ｄが下式のＭ１ｄ（上限値）を越えるときはＭ１ｄを、
−Ｍ１ｄ（下限値）未満のときは−Ｍ１ｄを、そしてＭ
１ｄ〜−Ｍ１ｄのときはＩ１ｄそのままを、それぞれ出
力する第１のｄ軸電流指令信号制限手段、およびｑ軸電
流指令信号Ｉ１ｑが下式のＭ１ｑ（上限値）を越えると
きはＭ１ｑを、−Ｍ１ｑ（下限値）未満のときは−Ｍ１
ｑを、そしてＭ１ｑ〜−Ｍ１ｑのときはＩ１ｑそのまま
を、それぞれ出力する第１のｑ軸電流指令信号制限手段
を備え、 第２の電流指令信号制限手段は、ｄ軸電流指令信号Ｉ２
ｄが下式のＭ２ｄ（上限値）を越えるときはＭ２ｄを、
−Ｍ２ｄ（下限値）未満のときは−Ｍ２ｄを、そしてＭ
２ｄ〜−Ｍ２ｄのときはＩ２ｄそのままを、それぞれ出
力する第２のｄ軸電流指令信号制限手段、およびｑ軸電
流指令信号Ｉ２ｑが下式のＭ２ｑ（上限値）を越えると
きはＭ２ｑを、−Ｍ２ｑ（下限値）未満のときは−Ｍ２
ｑを、そしてＭ２ｑ〜−Ｍ２ｑのときはＩ２ｑそのまま
を、それぞれ出力する第２のｑ軸電流指令信号制限手段
を備えたことを特徴とする請求項１記載の電力変換装
置。 Ｍ１ｄ＝Ｉｍ・｜Ｉ１ｄ｜／√（Ｉ１ｄ2＋Ｉ１ｑ2） Ｍ１ｑ＝Ｉｍ・｜Ｉ１ｑ｜／√（Ｉ１ｄ2＋Ｉ１ｑ2） Ｍ２ｄ＝{Ｉｍ−√（Ｉ１ｄ2＋Ｉ１ｑ2）}／√{１＋
（Ｉ２ｑ／Ｉ２ｄ）2} Ｍ２ｑ＝{Ｉｍ−√（Ｉ１ｄ2＋Ｉ１ｑ2）}／√{１＋
（Ｉ２ｄ／Ｉ２ｑ）2}2. A method according to claim 1, wherein the predetermined allowable current value on the first power system side of the power conversion section is Im, and any one of the positive-phase and negative-phase two-axis current command signals of the four-axis current command signals is used. I
1d and I1q, and when the other one of the two-axis current command signals is I2d and I2q, the first current command signal limiting means is a d-axis current command signal I1
When d exceeds M1d (upper limit) in the following equation, M1d is used.
-M1d if lower than -M1d (lower limit), and M
In the case of 1d to -M1d, the first d-axis current command signal limiting means for outputting I1d as it is, and M1q when the q-axis current command signal I1q exceeds M1q (upper limit value) of the following equation, -M1q -M1 when less than (lower limit)
q, and the first q-axis current command signal limiting means for outputting the same as I1q when M1q to -M1q, respectively. The second current command signal limiting means outputs the d-axis current command signal I2
If d exceeds M2d (upper limit) in the following equation, M2d is used.
-M2d if less than -M2d (lower limit), and M
In the case of 2d to -M2d, I2d is used as it is, the second d-axis current command signal limiting means for outputting the signal, and M2q when the q-axis current command signal I2q exceeds M2q (upper limit value) of the following equation, -M2q -M2 when less than (lower limit)
2. The power converter according to claim 1, further comprising second q-axis current command signal limiting means for outputting q and, when M2q to -M2q, I2q as it is, respectively. M1d = Im · | I1d | / √ (I1d 2 + I1q 2 ) M1q = Im · | I1q | / √ (I1d 2 + I1q 2 ) M2d = {Im−Ｉ (I1d 2 + I1q 2 )} / √ {1+
(I2q / I2d) 2 } M2q = {Im−√ (I1d 2 + I1q 2 )} / √ {1+
(I2d / I2q) 2 }
を経た４軸電流指令信号を基準形態の各基準電流指令信
号に変換する電流指令信号変換手段、電力変換部の第１
の電力系統側の電流検出値を上記基準形態の各基準電流
検出信号に変換する電流検出信号変換手段、上記各基準
電流指令信号と各基準電流検出信号とがそれぞれ一致す
るように上記各両信号の偏差に基づき各相電圧指令信号
を出力する第１の制御手段、および上記各相電圧指令信
号に基づき上記電力変換部の出力電圧を制御する第２の
制御手段を備えたことを特徴とする請求項１または２に
記載の電力変換装置。3. A current command signal converting means for converting a four-axis current command signal passed through the first and second current command signal limiting means into each reference current command signal in a reference form,
Current detection signal conversion means for converting the current detection value on the power system side into each reference current detection signal in the reference form, and the two signals so that the reference current command signals and the reference current detection signals respectively match. A first control means for outputting a phase voltage command signal based on the deviation of the first and second control means for controlling an output voltage of the power converter based on the phase voltage command signal. The power converter according to claim 1.
統の３相交流電圧から基準位相を検出してこの基準位相
に基づき４軸電流指令信号を３相基準電流指令信号に変
換し、電流検出信号変換手段は、電力変換部の上記第１
の電力系統側の電流検出値を３相基準電流検出信号とし
て出力することを特徴とする請求項３記載の電力変換装
置。4. The current command signal conversion means detects a reference phase from the three-phase AC voltage of the first power system, and converts the four-axis current command signal into a three-phase reference current command signal based on the reference phase. The current detection signal conversion means is provided in the first power conversion section.
The power converter according to claim 3, wherein the detected current value on the power system side is output as a three-phase reference current detection signal.
統の３相交流電圧から基準位相を検出してこの基準位相
に基づき４軸電流指令信号をｄ−ｑ２軸基準電流指令信
号に変換し、電流検出信号変換手段は、電力変換部の上
記第１の電力系統側の電流検出値を上記基準位相に基づ
きｄ−ｑ２軸基準電流検出信号に変換することを特徴と
する請求項３記載の電力変換装置。5. A current command signal converting means detects a reference phase from the three-phase AC voltage of the first power system, and converts the 4-axis current command signal into a dq 2-axis reference current command signal based on the reference phase. The current detection signal conversion means converts a current detection value of the power converter on the first power system side into a dq two-axis reference current detection signal based on the reference phase. Power converter.
２の電流指令信号制限手段を経た４軸電流指令信号を４
軸基準電流指令信号として出力し、電流検出信号変換手
段は、第１の電力系統の３相交流電圧から基準位相を検
出し、電力変換部の上記第１の電力系統側の電流検出値
を上記基準位相に基づき４軸基準電流検出信号に変換す
ることを特徴とする請求項３記載の電力変換装置。6. The current command signal converting means converts the four-axis current command signal passed through the first and second current command signal limiting means into four.
Output as a shaft reference current command signal, the current detection signal conversion means detects a reference phase from the three-phase AC voltage of the first power system, and outputs a current detection value of the power conversion unit on the first power system side. 4. The power converter according to claim 3, wherein the signal is converted into a four-axis reference current detection signal based on the reference phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11166451A JP2000358374A (en) | 1999-06-14 | 1999-06-14 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11166451A JP2000358374A (en) | 1999-06-14 | 1999-06-14 | Power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000358374A true JP2000358374A (en) | 2000-12-26 |
Family
ID=15831657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11166451A Pending JP2000358374A (en) | 1999-06-14 | 1999-06-14 | Power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000358374A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016017244A1 (en) * | 2014-07-30 | 2016-02-04 | 株式会社日立産機システム | Power conversion control device and solar power generation system |
| JP2019140743A (en) * | 2018-02-07 | 2019-08-22 | 富士電機株式会社 | Power converter |
| JPWO2022074715A1 (en) * | 2020-10-05 | 2022-04-14 |
-
1999
- 1999-06-14 JP JP11166451A patent/JP2000358374A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016017244A1 (en) * | 2014-07-30 | 2016-02-04 | 株式会社日立産機システム | Power conversion control device and solar power generation system |
| JP2016032426A (en) * | 2014-07-30 | 2016-03-07 | 株式会社日立産機システム | Power conversion controller and solar power generation system |
| CN106537752A (en) * | 2014-07-30 | 2017-03-22 | 株式会社日立产机系统 | Power conversion control device and solar power generation system |
| EP3176939A4 (en) * | 2014-07-30 | 2018-03-07 | Hitachi Industrial Equipment Systems Co., Ltd. | Power conversion control device and solar power generation system |
| CN106537752B (en) * | 2014-07-30 | 2019-03-22 | 株式会社日立产机系统 | Power conversion control apparatus and solar power system |
| JP2019140743A (en) * | 2018-02-07 | 2019-08-22 | 富士電機株式会社 | Power converter |
| JP7040077B2 (en) | 2018-02-07 | 2022-03-23 | 富士電機株式会社 | Power converter |
| JPWO2022074715A1 (en) * | 2020-10-05 | 2022-04-14 | ||
| WO2022074715A1 (en) * | 2020-10-05 | 2022-04-14 | 東芝三菱電機産業システム株式会社 | Control device of power converter device |
| JP7193012B2 (en) | 2020-10-05 | 2022-12-20 | 東芝三菱電機産業システム株式会社 | Power converter controller |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106026072B (en) | Double PWM converter DC bus-bar voltage fluctuation suppressing methods and control method | |
| JP3722048B2 (en) | Motor control device | |
| JPS58123394A (en) | Controller for ac motor | |
| JPS6318995A (en) | Voltage controller for wound-rotor type induction generator | |
| US20010043481A1 (en) | Inverter device | |
| JP2000116148A (en) | Power conversion apparatus | |
| JP2733724B2 (en) | Current control device for multi-winding AC motor | |
| JPH03253293A (en) | Driving system for ac motor and controlling method thereof | |
| JP2000358374A (en) | Power converter | |
| JP2887013B2 (en) | Parallel operation control device for three-phase AC output converter | |
| JP4219362B2 (en) | Rotating machine control device | |
| JP4581508B2 (en) | Control device for voltage source inverter | |
| JP3301189B2 (en) | Command converter for power converter | |
| JPH06335252A (en) | Method and equipment for controlling self-excited power converter | |
| JP2000341983A (en) | Controller for embedded magnet type synchronous motor | |
| JPH04281387A (en) | Controller for brushless dc motor | |
| JPH10178742A (en) | Circuit for controlling transfer of effective power of serial inverter | |
| JPH11164568A (en) | Power converter | |
| JPS6084992A (en) | Controlling method for induction motor | |
| JP3198212B2 (en) | Hybrid phase control device and its control device | |
| JP2523504B2 (en) | Power converter controller | |
| JPH0480639B2 (en) | ||
| JP2005073306A (en) | Control system of self-excitation type converter | |
| JPH0327786A (en) | Motor current controller | |
| JPH0720370B2 (en) | Power converter control circuit |