KR20000020272A - Potential source excitation system using space voltage vector method - Google Patents

Abstract

PURPOSE: An excitation system is provided to compose a PWM boost converter and a PWM inverter using a space vector voltage method. CONSTITUTION: An excitation system includes a PWM boost converter(20), a PWM inverter (40), a PWM boost converter control means, and a PWM inverter control means. The PWM boost converter is to switch three phases output power source of a transformer for an electric power using an electric power transformation element to a PWM method and transform into a direct voltage to control a reverse rate control and a voltage size. The PWM inverter is to receive an output power source of the PWM boost converter via a back current preventing part(30) using a diode and supply an excitation power source to the field magnet of a generator by a switching. The PWM boost converter control means compares the output terminal direct current of the PWM boost converter with a voltage instruction value, make a comparison integration. The PWM boost converter control means each other compares the comparison integration value and the reverse rate control value with q axis and d axis current values which transforms an input terminal three phase current of the PWM boost converter into dq axis space vector value. The PWM boost converter control means make a comparison integration control each comparison value and is to generate a gating signal of the PWM boost converter using the space voltage vector method. The PWM inverter control means is to measure a generator voltage establishment value to instruct a voltage of a generator and an output terminal voltage of a real generator, compare with the establishment value, and generate a switching signal of the PWM inverter using a signal which is compared with a desert wave via the comparison integration control.

Description

Stationary Excitation System Using Spatial Voltage Vector Method

The present invention relates to a stationary excitation system, and more particularly, to a stationary excitation system using a converter of a spatial voltage vector method having the characteristics of an existing stationary excitation system and having the advantages of an AC rotational excitation system.

The generators need a turbine and an excitation system to generate power, and the turbine sends speed and mechanical force to the generator, and the excitation system is a device that supplies magnetic flux to the field of the generator. Thus, the role of the generator is to convert the mechanical force from the turbine into electrical power. The generator needs to constantly control the voltage and frequency of the generator regardless of the load of the consumer. The device for controlling the voltage of such a generator is an excitation control system.

Excitation control system can be divided into AC excitation control system and stationary excitation control system.

The AC excitation control system controls the voltage of the generator indirectly by supplying power supplied to the field of the generator to the field using the AC rotating device and controlling the voltage of the field of the AC rotating device. At this time, the power of the AC rotating excitation system may use a separate power source in the power plant or the output terminal voltage of the AC rotating device.

On the other hand, the stationary excitation system supplies power to the field through a large-capacity power converter (for example, a thyristor converter or an IGBT converter) with the stepped down voltage of the generator output voltage through a transformer. Therefore, the pros and cons of AC rotary excitation system and stationary excitation system are as follows.

AC rotary excitation system

<Advantages>

1) The voltage adjustment range is wide.

2) The power of the excitation system is not affected by the system accident.

3) In case of system accident, there is high margin of system clearing time or generator reactance.

4) The capacity of the field breaker may be small.

5) The problem of cooling is small.

<Disadvantages>

1) The shaft of the generator gets longer.

2) The torsional mode tends to be caused by subharmonics in the system.

3) Maintenance is not easy because it uses a rotor.

4) The time delay is considerably large because the rotary generator for excitation is used to supply current to the field of the generator.

Stationary excitation system

<Advantages>

1) The shaft of the generator may be short.

2) There is almost no tonal mode due to the sub harmonics in the system.

3) Easy maintenance because no rotor is used.

4) The time delay is small because the excitation power is supplied from the generator stage.

<Disadvantages>

1) The voltage adjustment range is small.

2) The power supply of the excitation system is affected by a system accident.

3) In case of a system accident, the system shutdown time or generator reactance is small.

4) The capacity of the field breaker is large.

5) The problem of cooling is great.

Among the techniques to solve the shortcomings of the stationary excitation system, a large reactor is inserted into the output of the generator, and when a large current flows in the event of a failure, the power of the excitation system is secured using the voltage of the reactor to increase the ability to respond to a system accident GENERREX "excitation system, but this type of generator only takes into account transient stability, i.e. the ability to respond to failures, and the disadvantage of a narrow control range of reactor size and generator voltage remains.

1 shows a system configuration of a conventional voltage source stationary excitation system for a synchronous generator.

The general stationary excitation system uses a power potential transformer (PPT) for converting the output terminal voltage of the generator 4 into an input voltage for the excitation system by using the output power of the generator as the input power of the excitation system. And an AC / DC converter (2) for converting into a DC power supply for the excitation system using the output three-phase power supply of the power transformer (1) and supplying it to the excitation power supply of the field (3) of the generator (4), and And a controller 5 for generating and controlling a gate signal for controlling AC / DC conversion of the AC / DC converter 2.

FIG. 2 is a control block diagram of the general stationary excitation system shown in FIG. 1, which is a control block diagram of the controller 5 of FIG. 1.

Voltage measuring transformer 5a and current measuring current transformer 5b for measuring and feeding back the voltage and current of the output terminal of the generator 4, and voltage measuring transformer 5a and current measuring current transformer 5b. The automatic control unit 5c for automatically adjusting the generator voltage based on the terminal voltage and current of the generator fed back through the controller, the regulator 5d for adjusting the command value of the automatic control unit 5c, and the excitation system voltage or generator voltage. A manual control unit 5e for instructing a constant value to the excitation system without feedback, a current transformer 5i for detecting the output of the AC / DC converter 2 and supplying it to a reference value of the manual control unit 5e, and the manual control unit The regulator 5f for adjusting the command value of 5e, the selector 5g for automatically selecting manual control and automatic control by the output of the manual control unit 5e and the automatic control unit 5d, and the selector 5g. The firing angle of the AC / DC converter 2 is based on the output signal. It consists of the firing angle control part 5h to control.

In addition, an initial flashing circuit 6 for applying an initial driving power to the field 3 of the generator 4 through the battery is further included.

In this general stationary excitation system, when the DC voltage is applied by using an initial flashing circuit 6 which first applies power to the field 3 of the generator 4, the magnetic field is generated in the field and the magnetic flux is applied to the magnetic field. As a result, the output voltage of the generator 4 is generated.

The voltage then enters the AC / DC converter 2 power supply via the step-down transformer 1. Next, the firing angle signal is transmitted to the signal of the manual control unit 5e which commands a constant value to the excitation system and the automatic control unit 5d which automatically adjusts the generator voltage by feeding back the terminal voltage and current of the generator without feedback of the generator voltage. The AC / DC converter 2 is controlled through the firing angle control unit 5h. In addition, the automatic control unit 5d measures voltage and current of the generator by using a voltage measuring transformer 5a and a current measuring current transformer 5b to automatically feed back the output voltage and current of the generator and automatically according to the generator output. Take control.

However, since the general stationary excitation system as described above is designed to detect the output power of the generator to control the excitation system, it is difficult to secure the excitation power according to the voltage drop of the generator output stage. When it occurred, there was a disadvantage that the ability to respond to this falls.

Accordingly, an object of the present invention is to provide an excitation system that combines a PWM boost converter and a PWM inverter using a space vector voltage method.

In order to achieve the above object, the present invention controls a generator field power supply using a PWM boost converter, a boost converter, and an inverter, wherein the PWM boost converter controls power factor by using a PWM boost converter controller using a space voltage vector modulation method. The inverter controls the magnitude of the DC output voltage, and the inverter measures the generator output voltage and current, compares it with a set value for instructing the voltage of the generator, and controls the PWM inverter using a signal compared with a triangular wave through proportional integration control. It is characterized in that it is configured to.

The present invention also provides a circuit for supplying excitation power to a field through an AC / DC converter, an AC / DC converter for converting a three-phase power source controlled by a resonant voltage vector modulation method into a DC power source, and the AC / DC converter. The output voltage of the converter is characterized in that it is redundant by connecting a circuit that supplies the field through the boost converter in parallel.

In addition, in the redundancy system, the AC / DC converter using the IGBT is included in one more stage and configured in two stages in parallel to prepare for failure.

1 is a configuration diagram of a voltage source stationary excitation system for a typical synchronous generator.

2 is a control block diagram of a general stationary excitation system according to FIG.

3 is a block diagram of a stationary excitation system according to the present invention.

4 is a control block diagram of a PWM boost converter according to FIG. 3;

5 is an internal circuit diagram of a PWM boost converter gating signal generator.

FIG. 6 is a conceptual diagram illustrating a 3 / 2-phase converter of FIG. 4. FIG.

7 is a control block diagram of the PWM inverter of FIG.

8 is a diagram illustrating a redundant system in which the system of FIG. 3 and the system of FIG. 1 are connected in parallel.

9 is a diagram illustrating a triple system connecting the system of FIG. 3 and two systems of FIG. 1 in parallel.

<Description of the code | symbol about the principal part of drawing>

10: power transformer 20: PWM boost converter

30: reverse flow prevention unit 40: PWM inverter

50: initial fleshing unit 60: generator

61: field of the generator 100: PWM boost converter control unit

111: voltage command value 112,115,116: adder

113,118,119 PI controller 114 Power factor controller

117: 3/2 phase coordinate converter 120: Gating time calculator

121: gating signal generator 210: automatic control unit

220: PWM inverter control unit 511: initial signal generator

512: down counter 513: signal generator

514: clock generator 515: dead time generator

516 flip-flop 517,518 AND gate

610: 3/2 phase conversion unit 620: stop / rotation coordinate system

221: generator voltage set point 222,225: adder

223 PI controller 224 triangle wave generator

226: Dead Time Generator 227228: And Gate

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 shows a configuration diagram of an excitation control system according to the present invention.

Excitation system of the present invention, the power transformer 10 for converting the output voltage of the generator 60 to a three-phase excitation power supply, and the three-phase output power supply of the power transformer 10 stepped up to a DC voltage in a PWM method PWM boost converter 20 for converting, reverse flow prevention unit 30 for preventing reverse flow using a diode, and output of the reverse flow prevention unit 30 are switched to excite the field 61 of the generator 60. PWM inverter 40 for supplying power, initial pressing circuit 50 for supplying initial driving power to field 61 of generator 60,

Means 101 for detecting three-phase currents Ia _T , Ib _T , Ic _T at the output of the power transformer 10 and a voltage across the boost capacitor V _DC of the PWM boost converter 20. A PWM boost converter controller 100 which receives the three-phase current and the DC voltage through the means 102 and compares them with the voltage command value and the power factor control value and generates a gating signal of the PWM boost converter through proportional integral control;

A transformer 201 for detecting the output three-phase voltages Va, Vb, and Vc of the generator 60, a current transformer 202 for detecting three-phase currents Ia, Ib, and Ic, and a transformer 201 3 / 2-phase coordinate transducers 203 and 204 for converting the three-phase signals of the current transformer 202 into dq sine waves having a 90 degree phase difference, and output signals of the 3 / 2-phase coordinate transducers 203 and 204. An automatic voltage control unit 210 for comparing the automatic command value of the automatic voltage regulator AVR with proportional integral control, a current detector 205 for detecting the current I _F supplied to the field 61, and the current. The detection current I _F of the detector 205 and the automatic voltage control value of the automatic voltage controller 210 and the command value of the manual voltage controller (MVR) are compared, and the difference is proportionally integrated and compared with the triangular wave signal to compare the PWM. The PWM inverter controller 220 generates a switching signal of the inverter 40.

That is, according to the present invention, the excitation voltage of the field 61 is largely controlled through the boosting PWM boost converter 20 and the PWM inverter 40, but the spatially vector voltage is controlled through the PWM boost converter control unit 100. Generates a gating signal of the PWM boost converter 20 to control the power factor and the magnitude of the voltage. The automatic voltage controller 210 receives the output terminal voltage and the current of the generator 60 and compares it with the automatic control command value to perform proportional integral control. In addition, the PWM inverter controller 220 compares the automatic control value of the automatic voltage control unit 210 with the manual command value and the current supplied to the field 61 and compares the triangular wave through proportional integral control to compare the PWM inverter 40 with each other. Is configured to control the switching of.

Since the booster PWM boost converter 20 uses an IGBT with a built-in diode, the voltage rectified while maintaining a power factor of 1 by switching a semiconductor device capable of ON / OFF control such as IGBT or GTO. There is a function that can boost the pressure. In addition, when the output terminal voltage of the PWM boost converter 20 is ideally increased, the signal of the PWM boost converter controller 100 may be combined to return energy to the generator.

Next, the PWM inverter 40 adjusts the voltage of the field 61 using the DC output V _DC 102 of the PWM boost converter 20.

In addition, the system of the present invention is a kind of stationary excitation system, and an initial flashing circuit 50 for initially applying power to the generator field 61, and a constant value in the excitation system without feedback of the excitation system voltage or the generator voltage. A manual control unit (MVR) for commanding, an automatic control unit (AVR) for automatically adjusting the generator voltage by feeding back the terminal voltage and current of the generator, and a voltage measuring transformer for converting and transferring the voltage and current of the generator to the automatic control unit ( 201, a current measuring current transformer 202, and dq coordinate converters 203 and 204 for converting three-phase signals of voltage and current into three-two phases.

4 is a block diagram of the PWM boost converter controller of FIG. 3, which is a control block for appropriately controlling the PWM boost converter 20 to supply power applied from the generator 60 to the PWM inverter 40. The figure is shown.

The PWM boost converter control unit 100 compares the excitation voltage command value 111 for controlling the capacitor voltage of the boost converter with the voltage across the capacitor V _DC of the boost converter and detects the difference. And a first proportional integral controller 113 for proportionally integral control of the output signal of the first adder 112, and a secondary side three-phase current Ia _T , Ib _T , Ic _{T of} the power transformer 10. 3 / 2-phase coordinate converter 117 which coordinate-converts the d-axis and q-axis two-phase sinusoidal signals having a phase difference of 90 degrees and converts them into direct current voltages, and the d-axis signal of the 3 / 2-phase coordinate converter 117 and the A second adder 115 for comparing the output signal of the first proportional integral controller 113 and obtaining the difference, and a power factor controller 114 for providing a q-axis signal and a power factor command value of the 3 / 2-phase coordinate converter 117. Outputs of the third adder 116 and the second adder 115 and the third adder 116 that compare the output signals of The second and third proportional integral controllers 118 for controlling the proportional integral signals, and the output signals of the second and third proportional integral controllers 118 and 119 and the DC voltage V _DC of the boost converter. Gating time calculator 120 for generating three-phase gating timing signals Ta, Tb, and Tc, and gating timing signals Ta, Tb, and Tc, respectively, and counting the three phases of PWM boost converter 20, respectively. A gate signal generator 121 for generating gate signals A ⁺ , A ⁻ (B ⁺ , B ⁻ ) (C ⁺ , C ⁻ ).

5 is an internal configuration diagram of a PWM boost converter gating signal generator. Thus As shown, for the PWM control on the three for each phase gate timing signal gate signal of each phase and down-counting each input receives the (Ta, Tb, Tc) ( A +, A -) (B +, B -) consists of three signal generators (510, 520, 530) having the same configuration to each generate a ^- (C ^+, C).

One signal generator includes an initial signal generator 511 for generating an initial on / off signal, a load signal generator 513 for generating a command value (Load value) for down counting the gate timing signal Ta, and When the gate timing signal Ta is input, the down counter 512 starts down counting from the command value of the load signal generator 513 and the clock generator 514 generates a clock signal for synchronizing the down counter. And a flip-flop F which outputs an initial on / off signal of the initial signal generator 511 and alternately outputs an on / off signal based on a set signal according to the completion of the down count of the down counter 512. / F) 516 and a dead time signal for preventing two switching elements from conducting at the same time in synchronization with the clock signal of the clock generator 514 based on the set signal of the down counter 512. A first AND gate and outputs a dead time generator 515, which, by the dead time generator 515 and-combine the output signal and an output signal of the flip-flop 516 for generating a first signal (A ⁺⁾ in the affected 517 and a second end gate 518 for generating a second signal A ^{− of} the phase by combining and inverting the output of the flip-flop 516 with the output signal of the dead time generator 515. It is composed of Here, the first signal A ⁺ is supplied as a gate control signal of the first IGBT of the first phase of the PWM boost converter, and the second signal A ⁻ is a first signal connected in series with the first IGBT of the first phase of the PWM boost converter. It is supplied as a gate control signal of 2 IGBTs.

FIG. 6 shows the 3 / 2-phase coordinate converter 117 of FIG. 4, and the 3 / 2-phase converter 610 converts a sinusoidal three-phase signal into a dq sinusoidal wave having a phase difference of 90 degrees, and A stop / rotation coordinate system 620 is configured in which a signal passed through the 3 / 2-phase transform 610 is converted into a dq signal of a DC component. In addition, the 3 / 2-phase coordinate converters 203 and 204 of FIG. 3 are configured similarly to FIG.

Referring to the operation of the present invention configured as described above is as follows.

In the excitation system as shown in FIG. 2, when the output voltage of the generator decreases, the input voltage of the excitation system decreases to stop the generator. In contrast, in the system of FIG. 3 according to the present invention, even when the generator voltage decreases, the boost converter is used. The capacitor voltage can be boosted regardless of the input voltage. This widens the voltage adjustment range of the generator. Generally, although the system of FIG. 2 has a voltage adjusting range of the generator of 60% or more, the system of FIG. 3 may have a voltage adjusting range of the generator of 20% or more.

This is in addition to the stationary excitation system invented the advantages of the AC rotating excitation system described in the background of the invention.

The system operation sequence of the present invention is as follows. First, when the switch of the initial pressing part 50 is input in order to establish the initial voltage of a generator, a generator establishes a voltage. Then, when a voltage is applied to the PWM boost converter 20 through the step-down transformer 10, the power factor is controlled by switching the PWM boost converter element, and the voltage of the output terminal of the PWM boost converter 20 is boosted by the capacitor of the PWM boost converter 20. do.

Next, the boosted capacitor voltage (V _DC ) 102 is used as an input power source for the PWM inverter 40. The output of the inverter supplies current to the field 61 of the generator according to the switching of the PWM inverter 40. The output voltage of the generator 60 is controlled by the current.

An operation of the PWM boost converter controller 100 illustrated in FIG. 4 will be described. In order to control the PWM boost converter 20, in order to change the three-phase input voltage to the DC voltage, six power conversion elements (IGBT or GTO semiconductor elements) must be sequentially controlled as shown in FIG.

If of A ⁺ Wow A ^- At the same time, because the overcurrent flows to the semiconductor element and the converter is damaged. A ⁺ Wow A ^- Should always output the opposite output.

And of FIG. 3 A ^-, B ^+, C ⁺ Following the switching of A ⁺ , B ⁺ , C ⁺ When conducting, the three-phase equilibrium condition is broken so that the converter's DC output voltage does not come out. Therefore, three phases, or six elements, must be conducted sequentially. A, B, C By adjusting the conduction time of the power conversion device, such as power factor control and the magnitude of the DC output voltage of the converter can be controlled.

Spatial voltage vector modulation A, B, C It refers to a method that can control the DC output voltage while controlling the power factor by calculating the conduction time of the power conversion device such as. The control sequence is as follows.

The control operation of the PWM boost converter control unit receives the voltage V _DC of the DC output terminal 102 of the PWM boost converter 20 and compares the signal through the DC voltage command value 111 and the first adder 112. The gating signal of the PWM boost converter 20 is controlled by a space voltage vector method.

On the other hand, the current signal (Ia _T , Ib _T , Ic _T ) measured on the secondary side of the step-down transformer 10 is input from the 3 / 2-phase coordinate converter 117, and the d- and q-axis direct currents having a phase difference of 90 degrees. The signal is converted as a component signal, and the signal is sent to the second PI controller 118 by comparing the q-axis current and the output of the first PI controller 113 in the second adder 115. In addition, the output signal of the power factor controller 114 that controls the d-axis current and the d-axis current of the 3 / 2-phase coordinate converter 117 are compared to the third adder 116 and signaled to the third PI controller 119. Send it.

In this case, when the three-phase is converted to the two-phase, the d-axis becomes an invalid value. When the value of the d-axis is set to 0, the invalid current becomes zero, so that the power factor of 1 can be controlled.

Therefore, there is a power factor controller 114 for controlling the d-axis current and by using the components of the d-axis and q-axis of the PWM boost converter 20 ^{A +, A -, B +} , B -, C +, C - Of the gating time calculator 120 and the PWM boost converter 20 to determine the switching time of the ^{A +, A -, B +} , B -, C +, C - The PWM boost converter 20 is operated through the gate signal generator 121 for switching.

FIG. 5 shows an internal circuit diagram of the PWM boost converter gating signal generator. When the gating timing signals Ta, Tb, and Tc are input, these signals are commanded from the signal generator 513 using the down counter 512. The count is reversed from the value. In addition, since the gating sustain generation signal using the down counter 512 needs to be synchronized, the clock generator 514 inputs a pulse to the down counter 512. The value output from the down counter 512 applies a signal to the flip flop 516 that performs ON / OFF operation only so that the ON / OFF operation occurs.

Meanwhile, the PWM boost converter 20 A ^+, A ^- Switching at the same time may damage the device. A ^+, A ^- There is a dead time generator 515 to prevent the conduction at the same time, the output signal of the dead time generator 515 and the signal output from the flip-flop 516 through the AND gate (517) 518 PWM boost converter ( 20) to operate.

B ^+, B ^- With signal generator 520 C ^+, C ^- Internal operation of the signal generator 530 is A ^+, A ^- Same as the signal generator 510.

FIG. 6 shows the 3 / 2-phase coordinate converter 117 shown in FIG. 4 and the 3 / 2-phase coordinate converter (d / q converter) 203 and 204 of FIG. 3, and shows a sinusoidal three-phase signal. Is a 3/2 phase converter 610 for converting the signal into a dq sinusoidal wave having a phase difference of 90 degrees, and a stationary / rotary coordinate system in which a signal passed through the 3/2 phase converter 610 is converted into a dq signal of a DC component ( 620).

FIG. 7 is a control block diagram of the PWM inverter of FIG. 3, which compares a generator voltage set value 221 for instructing a generator voltage and a measured value V _g , which measures an actual generator output short-circuit voltage, through an adder 222 to PI. Input to the controller 223, the output signal of the PI controller 223 and the output signal of the triangular wave generator 224 is compared in the adder 225, and using the output signal of the adder 225 to switch the PWM inverter ^{D +, D -, E +} , E - To conduct. That is, the output signal of the adder 225 and the output signal of the dead time generator 226 for generating dead time by the output signal of the adder 225 through the two AND gates 227 and 228. ^{D +, D -, E +} , E - Outputs PWM to switch the inverter 40.

Meanwhile, FIG. 8 is a modified embodiment of the present invention, and as shown therein, a redundant system in which the structure of the PWM boost converter, the non-return diode, and the PWM inverter of FIG. 3 and the AC / DC converter of FIG. 1 are connected in parallel. Is showing.

The redundancy system having such a structure supplies the excitation voltage of the generator through the AC / DC converter 810 when the voltage of the generator is normal, and the PWM boost converter 820 having the boost converting function when the voltage of the output terminal of the generator drops. The excitation power is supplied to the field 61 of the generator via the backflow prevention diode 830 and the PWM inverter 840. Of course, the PWM boost converter controller has the same configuration as the controller of FIG. 3, and the gate control signal of the AC / DC converter 810 is also controlled through the firing angle control means. This results in a system combining the advantages of FIGS. 3 and 1.

In addition, FIG. 9 is a structure in which the AC / DC converter is further included in FIG. 8, which shows a triple system in which the system of FIG. 3 and two systems of FIG. 1 are connected in parallel. In this case, since the two AC / DC converters 910 and 920 are connected in parallel, if any one of them is abnormal, it is automatically operated on the other side to control the PWM boost converter when the generator output voltage drops. In step 930, the backflow prevention diode 940 and the PWM inverter 950 are boosted and supplied to the field of the generator at a required stable voltage, thereby ensuring more stability.

The advantages of the present invention are listed as follows.

1) Stationary type with simple equipment and easy maintenance.

2) The excitation power can be secured according to the voltage drop of the generator output stage.

3) As this system is a dual system, it has high robustness against system failure.

4) Less energy loss than a redundant system consisting only of a boost-buck converter.

5) Stable operation in normal or transient condition is possible.

Claims (8)

In the excitation system for supplying the excitation power of the generator field by converting the output terminal voltage of the generator through a power transformer and converting it into direct current, PWM boost converter 20 for converting the three-phase output power of the power transformer by a PWM method using a power conversion element to convert the power factor control and the voltage to a DC voltage controlled; A PWM inverter 40 which receives the output power of the PWM boost converter 20 through the backflow prevention unit 30 using a diode and supplies excitation power to the field of the generator by switching; Q-axis and d-axis currents obtained by comparing the DC voltage and the voltage command value of the output terminal of the PWM boost converter, and converting the proportional integral value and the power factor control value and the three-phase current of the PWM boost converter into dq-axis space vector values. A PWM boost converter control means for comparing the values with each other and proportionally integrally controlling the comparison values to generate a gating signal of the PWM boost converter using a space voltage vector method; It is composed of a PWM inverter control means for generating a switching signal of the PWM inverter by measuring the generator voltage set value to command the voltage of the generator and the actual generator output terminal voltage and compare with the set value and through the proportional integral control compared with the desert wave. Excitation system using space voltage vector method. According to claim 1, wherein the PWM boost converter control means, A first adder 112 for comparing the excitation voltage command value 111 for controlling the capacitor voltage of the PWM boost converter 20 with the voltage across the capacitor V _DC of the boost converter and detecting the difference; A first proportional integral controller 113 for proportionally integral controlling the output signal of the first adder 112, Coordinate transformation of the secondary three-phase currents Ia _T , Ib _T , and Ic _{T of} the power transformer 10 into d-axis and q-axis two-phase square wave signals having a 90-phase difference, respectively Two-phase coordinate converter 117, A second adder 115 for comparing the d-axis signal of the 3 / 2-phase coordinate converter 117 with the output signal of the first proportional integral controller 113 and obtaining the difference; A third adder 116 for comparing the q-axis signal of the 3 / 2-phase coordinate converter 117 with the output signal of the power factor controller 114 providing the power factor command value and obtaining the difference; Second and third proportional integral controllers 118 for proportionally integral controlling the output signals of the second adder 115 and the third adder 116, respectively; Gating time calculator for generating three-phase gating timing signals Ta, Tb, and Tc based on the output signals of the second and third proportional integral controllers 118 and 119 and the DC voltage V _DC of the boost converter. 120, The gating timing signal 3 on the gate signals of the respective counts (Ta, Tb, Tc) the PWM boost converter ^{(20) (A +, A} -) (B +, B -) (C +, C -) to generate An excitation system using a space voltage vector method, characterized in that consisting of a gate signal generator 121. The method of claim 2, The PWM boost converter gating signal generator, A gate timing signal for each phase to PWM control on the 3 (Ta, Tb, Tc), each input receiving down counting to the gate signal of each phase of ^{(A +, A -) (} B +, B -) (C +, C - ) Are composed of three signal generators (510, 520, 530) of the same configuration to generate each, The one signal generator An initial signal generator 511 for generating an initial on / off signal, A load signal generator 513 for generating a command value (Load value) for down counting the gate timing signal Ta; A down counter 512 which starts a down count from a command value of the load signal generator 513 when the gate timing signal Ta is input; A clock generator 514 for generating a clock signal for synchronizing the down counter; A flip-flop (F / F) that outputs an initial on / off signal of the initial signal generator 511 and alternately outputs an on / off signal based on a set signal according to the completion of the down count of the down counter 512. ) (516), A dead time generator 515 for outputting a dead time signal for preventing two switching elements from conducting simultaneously in synchronization with a clock signal of the clock generator 514 based on the set signal of the down counter 512; A first and gate 517 for generating a first signal A ^{+ of} the phase by AND combining the output signal of the dead time generator 515 and the output signal of the flip-flop 516, And a second end gate 518 which generates a second signal A ^{− of} a corresponding phase by AND combining the signal inverting the output of the flip-flop 516 and the output signal of the dead time generator 515. Excitation system using spatial voltage vector method. The method of claim 2, The 3 / 2-phase coordinate converter 117, A 3/2 phase converter 610 for converting a sinusoidal three-phase signal into a dq sinusoidal wave having a phase difference of 90 degrees; Excitation system using the spatial voltage vector method, characterized in that consisting of a stop / rotation coordinate system (620) in which the signal passed through the three-two-phase conversion (610) is converted into a dq signal of the DC component. The method of claim 1, The PWM inverter control means, A transformer 201 for detecting the output three-phase voltages Va, Vb, and Vc of the generator 60 and a current transformer 202 for detecting three-phase currents Ia, Ib, and Ic; 3/2 phase coordinate converters 203 and 204 for converting the three phase signals of the transformer 201 and the current transformer 202 into dq sinusoids having a 90 degree phase difference, An automatic voltage controller 210 which compares the output signal of the 3 / 2-phase coordinate converter 203 and 204 with the automatic command value of the automatic voltage regulator (AVR) and performs proportional integral control; A galvanometer detector 205 for detecting a current I _F supplied to the field 61, a detection current I _F of the current detector 205, an automatic voltage control value of the automatic voltage control unit 210, and Spatial voltage vector comprising a PWM inverter controller 220 for comparing the command value of the manual voltage controller (MVR) and proportionally integrally control the difference, and compares the difference with the triangular wave signal to generate the switching signal of the PWM inverter (40). Excitation system using the method. The method of claim 5, The control unit 220 of the PWM inverter, A first adder 222 for comparing the generator voltage set value 221 for commanding the voltage of the generator with the measured value V _{g in} which the actual generator output short voltage is measured; A PI controller 223 for proportionally integral control of the output signal of the adder 222, A second adder 225 for comparing the output signal of the PI controller 223 with the output signal of the triangular wave generator 224, A dead time generator 226 for generating a dead time for preventing the vertical switching elements of the PWM inverter from being turned on at the same time by using the output signal of the second adder 225, The output signal of the dead time generator 226, the output signal of the second adder 225, and an inverted signal of the output signal, respectively; ^{D +, D -, E +} , E - Excitation system using a space voltage vector method, characterized in that consisting of two end gates (227, 228) for generating a. The method of claim 1, The excitation system is, It further includes an AC / DC converter in which switching is controlled by a firing angle control method in response to the voltage and current values of the output terminal of the generator compared with the generator voltage command value, and connected in parallel with the PWM boost converter, the backflow prevention unit and the PWM inverter. Excitation system using a space voltage vector method, characterized in that the configuration. The method of claim 7, wherein The excitation system is, The excitation system using the space voltage vector method, characterized in that it further comprises another AC / DC converter connected in parallel with the AC / DC converter.