JP2010161902A5

JP2010161902A5 -

Info

Publication number: JP2010161902A5
Application number: JP2009003741A
Authority: JP
Filing date: 2009-01-09
Publication date: 2012-01-05
Anticipated expiration: 2029-01-09

Description

本発明の第１の側面によって提供されるインバータ制御回路は、直流電源で生成される直流電力を交流電力に変換して電力系統に供給するインバータ回路をＰＷＭ制御するためのインバータ制御回路であって、前記インバータ回路の出力電流から無効分電流を算出する無効分電流算出手段と、系統電圧と目標系統電圧との偏差から系統電圧補正値を算出する系統電圧補正値算出手段と、前記系統電圧補正値から目標無効分電流を算出して出力する算出手段と、前記無効分電流算出手段によって算出された無効分電流と前記算出手段から出力される目標無効分電流との偏差から無効分電流補正値を算出する無効分電流補正値算出手段と、前記無効分電流補正値から指令値信号を生成する指令値信号生成手段と、前記指令値信号に基づいてＰＷＭ信号を生成するＰＷＭ信号生成手段と、を備えており、前記算出手段は、前記系統電圧補正値と前回の目標無効分電流との間の値を前記目標無効分電流として算出する、ことを特徴とする。 An inverter control circuit provided by a first aspect of the present invention is an inverter control circuit for PWM control of an inverter circuit that converts DC power generated by a DC power source into AC power and supplies the AC power to the power system. a reactive current computing means for computing a reactive current from an output current of the inverter circuit, and the system voltage correction value calculating means for calculating the system voltage correction value from the deviation between the system integrated voltage and the target system voltage, the system voltage A calculation means for calculating and outputting a target reactive current from the correction value, and a reactive current correction from a deviation between the reactive current calculated by the reactive current calculation means and the target reactive current output from the calculation means A reactive current correction value calculating means for calculating a value, a command value signal generating means for generating a command value signal from the reactive current correction value, and PWM based on the command value signal PWM signal generation means for generating a signal, and the calculation means calculates a value between the system voltage correction value and the previous target reactive current as the target reactive current. And

本発明の第３の側面によって提供されるプログラムは、コンピュータを、直流電源で生成される直流電力を交流電力に変換して電力系統に供給するインバータ回路をＰＷＭ制御するためのインバータ制御回路として機能させるためのプログラムであって、前記コンピュータを、前記インバータ回路の出力電流から無効分電流を算出する無効分電流算出手段と、系統電圧と目標系統電圧との偏差から系統電圧補正値を算出する系統電圧補正値算出手段と、前記系統電圧補正値から目標無効分電流を算出して出力する算出手段と、前記無効分電流算出手段によって算出された無効分電流と前記算出手段から出力される目標無効分電流との偏差から無効分電流補正値を算出する無効分電流補正値算出手段と、前記無効分電流補正値から指令値信号を生成する指令値信号生成手段と、前記指令値信号に基づいてＰＷＭ信号を生成するＰＷＭ信号生成手段と、して機能させ、前記算出手段は、前記系統電圧補正値と前回の目標無効分電流との間の値を前記目標無効分電流として算出する、ことを特徴とする。 The program provided by the third aspect of the present invention functions as an inverter control circuit for PWM control of an inverter circuit that converts a DC power generated by a DC power source into an AC power and supplies the computer to an electric power system. a program for causing, the computer calculates a reactive current calculating means for calculating, the system voltage correction value from the deviation between the system integrated voltage and the target system voltage a reactive current from an output current of the inverter circuit System voltage correction value calculation means, calculation means for calculating and outputting a target reactive current from the system voltage correction value, reactive current calculated by the reactive current calculation means, and target output from the calculation means A reactive current correction value calculating means for calculating a reactive current correction value from a deviation from the reactive current, and a command value signal from the reactive current correction value. A command value signal generating unit configured to generate and a PWM signal generating unit configured to generate a PWM signal based on the command value signal, and the calculating unit includes the system voltage correction value, the previous target reactive current, Is calculated as the target reactive current.

図２は、ＰＬＬ回路１４の一例を説明するための図である。ＰＬＬ回路１４は、αβ変換回路１４１、ｄｑ変換回路１４２、ＰＩ制御回路１４３、ＶＣＯ(Voltage Controlled Oscillator)回路１４４を備えている。αβ変換回路１４１は、系統電圧センサＡ８より入力される３相の電圧信号Ｖu、Ｖv、Ｖwを２相の電圧信号Ｖα、Ｖβに変換するものである。ｄｑ変換回路１４２は、αβ変換回路１４１から電圧信号Ｖα、Ｖβが入力され、ＶＣＯ回路１４４から位相θが入力される。ｄｑ変換回路１４２は、電圧信号Ｖα、Ｖβの位相θとの位相差成分Ｖdと同相成分Ｖqとを算出する。ＰＩ制御回路１４３は、位相差成分ＶdがゼロとなるようにＰＩ制御を行ない、補正値を出力する。この補正値を系統電圧信号の目標角周波数ω_s ^*に加算した角周波数ω₀が、ＶＣＯ回路１４４に出力される。ＶＣＯ回路１４４は、入力に応じた位相θをｄｑ変換回路１４２に出力する。このフィードバック制御により、位相差成分Ｖdがゼロになったところでロックされる。このとき、位相θが系統電圧の位相と一致する。したがって、ＰＬＬ回路１４から出力される角周波数ω₀は、系統電圧信号の角周波数と一致することになる。 FIG. 2 is a diagram for explaining an example of the PLL circuit 14. The PLL circuit 14 includes an αβ conversion circuit 141, a dq conversion circuit 142, a PI control circuit 143, and a VCO (Voltage Controlled Oscillator) circuit 144. The αβ conversion circuit 141 converts the three-phase voltage signals Vu, Vv, Vw input from the system voltage sensor A8 into two-phase voltage signals Vα, Vβ. The dq conversion circuit 142 receives the voltage signals Vα and Vβ from the αβ conversion circuit 141 and the phase θ from the VCO circuit 144. The dq conversion circuit 142 calculates a phase difference component Vd and an in-phase component Vq with respect to the phase θ of the voltage signals Vα and Vβ. The PI control circuit 143 performs PI control so that the phase difference component Vd becomes zero, and outputs a correction value. An angular frequency ω _{0 obtained} by adding this correction value to the target angular frequency ω _s ^* of the system voltage signal is output to the VCO circuit 144. The VCO circuit 144 outputs the phase θ corresponding to the input to the dq conversion circuit 142. By this feedback control, the phase difference component Vd is locked when it becomes zero. At this time, the phase θ matches the phase of the system voltage. Accordingly, the angular frequency omega ₀ that will be output from the PLL circuit 14 will coincide with the angular frequency of the system voltage signal.

指令値信号生成回路３１は、ＰＬＬ回路１４が検出する系統電圧信号の角周波数ω₀に乗算器１３から出力される角周波数差Δωを加算した修正角周波数（ω₀＋Δω）、およびＰＩ制御回路２３が出力する補正値が入力され、指令値信号を生成するものである。具体的には、指令値信号生成回路３１は、入力される修正角周波数（ω₀＋Δω）を時間ｔで積分したものを位相とし、入力される補正値に基づいて振幅を変化された正弦波を生成する。指令値信号生成回路３１は、この正弦波をＵ相の指令値信号として、ＰＷＭ信号生成回路３２に出力する。また、指令値信号生成回路３１は、Ｕ相の指令値信号より位相が（１/３）π遅れた正弦波をＶ相の指令値信号として、（２/３）π遅れた正弦波をＷ相の指令値信号として、ＰＷＭ信号生成回路３２に出力する。 The command value signal generation circuit 31 includes a correction angular frequency (ω ₀ + Δω) obtained by adding the angular frequency difference Δω output from the multiplier 13 to the angular frequency ω ₀ of the system voltage signal detected by the PLL circuit 14, and a PI control circuit The correction value output by the signal 23 is input to generate a command value signal. Specifically, the command value signal generation circuit 31 uses a phase obtained by integrating the input corrected angular frequency (ω ₀ + Δω) at time t, and the amplitude is changed based on the input correction value. Is generated. The command value signal generation circuit 31 outputs this sine wave to the PWM signal generation circuit 32 as a U-phase command value signal. The command value signal generation circuit 31 uses a sine wave whose phase is delayed by (1/3) π from the U-phase command value signal as a V-phase command value signal, and uses a sine wave delayed by (2/3) π as W. It outputs to the PWM signal generation circuit 32 as a phase command value signal.

Claims

An inverter control circuit for PWM control of an inverter circuit that converts DC power generated by a DC power source into AC power and supplies the power to the power system,
Reactive current calculation means for calculating a reactive current from the output current of the inverter circuit;
And the system voltage correction value calculating means for calculating the system voltage correction value from the deviation between the system integrated voltage and the target system voltage,
Calculating means for calculating and outputting a target reactive current from the system voltage correction value;
A reactive current correction value calculating means for calculating a reactive current correction value from a deviation between the reactive current calculated by the reactive current calculating means and a target reactive current output from the calculating means;
Command value signal generating means for generating a command value signal from the reactive current correction value;
PWM signal generating means for generating a PWM signal based on the command value signal;
With
The calculation means calculates a value between the system voltage correction value and the previous target reactive current as the target reactive current,
An inverter control circuit characterized by that.

Angular frequency difference calculating means for calculating a required angular frequency difference between the angular frequency of the output voltage signal of the inverter circuit and the angular frequency of the system voltage signal of the power system from the DC voltage of the DC power supply and its target voltage; ,
Angular frequency detection means for detecting the angular frequency of the system voltage signal;
With
The command value signal generation means generates a command value signal from the corrected angular frequency obtained by adding the angular frequency difference to the angular frequency detected by the angular frequency detection means and the reactive current correction value.
The inverter control circuit according to claim 1.

The angular frequency difference calculating means includes
DC voltage correction value calculating means for calculating a DC voltage correction value by performing feedback control based on a deviation between the DC voltage of the DC power supply and the target voltage;
Multiplication means for calculating the angular frequency difference by multiplying the DC voltage correction value calculated by the DC voltage correction value calculation means by a predetermined value;
With
The predetermined value is set so that a product obtained by multiplying the target voltage matches an angular frequency of the system voltage signal.
The inverter control circuit according to claim 2.

The inverter control circuit according to claim 2 or 3 , wherein the angular frequency detection means is a PLL circuit.

5. The inverter control circuit according to claim 2, wherein the command value signal generating unit generates a sine wave having the corrected angular frequency as an angular frequency.

A grid-connected inverter system comprising the inverter control circuit according to any one of claims 1 to 5.

Computer
A program for functioning as an inverter control circuit for PWM control of an inverter circuit that converts DC power generated by a DC power source into AC power and supplies the power to the power system,
The computer,
Reactive current calculation means for calculating a reactive current from the output current of the inverter circuit;
And the system voltage correction value calculating means for calculating the system voltage correction value from the deviation between the system integrated voltage and the target system voltage,
Calculating means for calculating and outputting a target reactive current from the system voltage correction value;
A reactive current correction value calculating means for calculating a reactive current correction value from a deviation between the reactive current calculated by the reactive current calculating means and a target reactive current output from the calculating means;
Command value signal generating means for generating a command value signal from the reactive current correction value;
PWM signal generating means for generating a PWM signal based on the command value signal;
To function,
The calculation means calculates a value between the system voltage correction value and the previous target reactive current as the target reactive current,
A program characterized by that.

A computer-readable recording medium on which the program according to claim 7 is recorded.