WO2019039626A1 - Pwm control device of three-phase three-level power conversion device - Google Patents

Abstract

The present invention relates to a PWM control device of three-phase three-level power conversion device, and comprises a carrier signal generation module which detects first and second DC input voltages (VC1, VC2) when DC voltages which are different with respect to a neutral point are applied to the first and second DC input voltages, and generates and provides first and second carrier signals (VCarr1 and VCarr2) such that at least one of a duty cycle, a frequency, and a phase is different according to the magnitudes of the first and second DC input voltages; a comparison module which forms a first comparison group, a second comparison group, and the third comparison group, using the plurality of comparators, inputs a first reference signal (VuRef), a second reference signal (VvRef), and a third reference signal (VwRef) having a difference from the first and second carrier signals by a predetermined phase value into inverting terminals of the first comparison group, the second comparison group, and the third comparison group, respectively, and when the plurality of carrier signals are input into the non-inverting terminals of the first comparison group, the second comparison group, and the third comparison group, the reference signal (VX-Ref) of the inverting terminal is compared with the carrier signal of the non-inverting terminal and providing an output signal with respect to a high/low state; a gate signal generation module in which a first output line and a second output line are connected to an output-end of the comparison module, the first output line applies an output signal of the comparison module to a power switching element as a first gate signal, and the second output line applies a second gate signal having a complementary relationship to the first gate signal to the power switching element. Accordingly, the present invention can perform maximum power operation and charge/discharge functions while outputting an AC output voltage of high power quality by directly using a different DC input voltage of a three-phase three-level inverter without any additional features such as a DC power conversion device, reduce the size of an output filter by reducing the harmonic components of the voltage current output from the three-phase three-level inverter, and improve the PWM control performance, reliability, and lifetime as the linearity of the three-phase three-level inverter increases.

Description

PWM controller of 3-phase 3-level power inverter

The present invention relates to a PWM control apparatus for a three-phase three-level power conversion apparatus, and more particularly, to a PWM control apparatus for a three-phase three-level power conversion apparatus in which two different DC voltages connected in series to a DC- Phase three-level power conversion apparatus capable of improving power quality by reducing harmonic components of alternating-current voltages and alternating currents on the input side and output side even under conditions where the fluctuation of the direct-current voltage exceeds the error range.

Three-level three-level inverters, which are similar to the three-level power converters that are applied to the rectifiers of the battery-related system (BESS, battery energy storage system), photovoltaic power generator, ship rectifier and DC microgrid system, Pole multi-contact switch that selectively outputs the voltage of the three level voltages (V _PN , V _ON , 0 V) applied from the voltage. Such a three-phase three-level inverter outputs a DC voltage according to a predetermined pattern within a predetermined period as a voltage similar to an AC voltage.

FIG. 1 is a view for explaining a three-level voltage output state of a general three-phase three-level inverter, and FIG. 2 is a diagram for explaining a configuration of a power conversion system including a general three-

1 and 2, the three-phase three-level inverter 10 is configured using a DC-Link 20 having two or more capacitors on the input side, and a DC voltage V _C1 = V _PN -V _ON , V _C2 = V _ON ) is applied to the DC input voltage.

On the other hand, the DC voltage applied to the DC-Link 20 from a photovoltaic (PV) array or battery is applied with the entire DC voltage (V _C1 + V _C2 = V _PN ) in which the neutral point is ignored The two DC input voltages (V _C1 , V _C2 ) are maintained at voltages of different magnitudes.

 The AC voltage output from the three-phase three-level inverter 10 under the condition that the DC input voltage is different may deteriorate the power quality due to the increased distortion rate and the static and dynamic performance of the entire system including the power conversion device.

To solve this problem, the three-phase three-level inverter 10 must include a voltage balancing controller for maintaining the different DC input voltages at the same voltage within the error range while performing the power conversion function.

However, the DC voltage of the solar array or the battery changes greatly in the magnitude of the voltage (V _DC ) for a short time depending on the surrounding environment, charging / discharging operation, and installation conditions, and, due to the characteristics of the power conversion system for operating the maximum power, It is impossible to output an AC voltage of stabilized high power quality only by the voltage balancing controller of the level inverter 10. [

Therefore, in general, the power conversion system includes a three-phase three-level inverter 10, a DC-to-DC converter (Unidirectional / Bidirectional DC-DC Converter) 30 capable of stabilizing a DC voltage and performing a voltage balancing function and a maximum power operation ).

There are many power conversion techniques for controlling DC input voltages that are different from each other within the tolerance range, and switching methods for three-level inverters within a stable range of DC input voltage within a tolerance range. However, A technique for outputting an AC voltage of high power quality directly using an input voltage has not yet been provided.

The present invention relates to a PWM control device of a three-phase three-level power conversion device capable of outputting an AC output voltage of high power quality directly using a different DC input voltage of a three-phase three-level inverter without any additional configuration of a DC power conversion device to provide.

Among the embodiments, the PWM controller of the three-phase three-level power conversion apparatus is configured such that when a DC voltage different from the neutral point is applied to the first and second DC input voltages V _C1 and V _C2 , The first and second carrier signals VCarr1 and VCarr2 are generated and provided so that at least one of the duty ratio, the frequency, and the phase is different according to the magnitude of the first and second DC input voltages, A carrier signal generation module for generating a carrier signal; A first comparison group, a second comparison group and a third comparison group are formed using a plurality of comparators, a first reference signal (V _uRef ) having a difference by a predetermined phase value from the first and second carrier signals, 2 reference signal (V _vRef ) and a third reference signal (V _wRef ) to the inverted terminals of the first comparison group, the second comparison group and the third comparison group, respectively, (V _{X -Ref} ) of the inverting terminal and the carrier signal of the non-inverting terminal are compared with each other to determine a high / low (High / Low) state A comparison module for providing an output signal to the output module; And a first output line and a second output line are connected to an output terminal of the comparison module, the first output line applies an output signal of the comparison module to a power switching element as a first gate signal, And a gate signal generation module for applying a second gate signal having a complementary relationship with the first gate signal to the power switching element.

The carrier signal generation module generates carrier signals VCarr1 and VCarr2 in the form of triangular waves that are the same as the voltage magnitudes of the first and second DC input voltages V _C1 and V _C2 , Duty ratio, phase, duty ratio, and phase of the carrier signal.

The first reference signal V _uRef , the second reference signal V _vRef , and the third reference signal V _wRef have phase differences of 2π / 3 from the first and second carrier signals, respectively.

A second reference to the first comparison group, the second comparative group, and the third comparative group, and the first reference signal (V _uRef) input to include two comparators per group, and the first comparison group, the second comparative group and the signal (V _vRef) input, the is characterized in that the third reference signal (V _wRef) input to the third comparison group.

The gate signal generation module generates 12 gate signals TA1, / TA1, and TA2 for turn-on and turn-off operations of the power switching device by the first comparison group, the second comparison group, TA2, / TA2, TB1, / TB1, TB2, / TB2, TC1, / TC1, TC2, / TC2.

And the second output line includes a NOT gate.

The AC output voltage V _O outputted under the voltage condition of the three level voltages V _PN , V _ON and 0 V applied from the DC input voltages V _C1 and V _C2 is the same as the first and second carrier signals VCarr1 (V _PN , V _ON , 0V) according to the first reference signal (V _uRef ), the second reference signal (V _vRef ), and the third reference signal (V _wRef ) .

When the first reference signal V _uRef , the second reference signal V _vRef , and the third reference signal V _{wRef pass} the first DC input voltage V _C1 , that is, V _PN <V _{X _Ref} <V _ON The comparison module compares the first carrier signal VCarr1, which oscillates between V _PN and V _ON , with a reference voltage to output a gate signal, and the AC output voltage V _O is expressed as V And outputs a synthesized voltage using _PN and V _ON .

To the reference signal (V _{X _Ref)} compares the first carrier signal and the second carrier signal (VCarr2) of the gate signal generating module, such as during passing through the (VCarr1) area, to the equation (2) providing an output signal The connection terminals TA2, TB2, and TC2 maintain the turn-on state at all times and compare the first carrier signal among the gate signal generation modules to output the voltage of V _PN and provide a connection terminal TA1 Off signal is applied to the connection terminals TA1, TB1, and TC1 to output a voltage of V _ON , and a turn-off signal is applied to the connection terminals TA1, TB1, and TC1.

When the first reference signal V _uRef , the second reference signal V _vRef , and the third reference signal V _{wRef pass} the second DC input voltage V _C2 , that is, V _oN <V _{X _Ref} <0 V The comparison module determines that V _ON And the second carrier signal VCarr2, which is oscillated between 0 V and 0 V, and outputs a gate signal. The AC output voltage (V _O ) is a voltage synthesized by using V _ON and 0 V And outputs the output signal.

During the reference signal (V _{X _Ref)} is passing through the second carrier signal (VCarr2) region, to one as compared to the first carrier signal (VCarr1) of the gate signal generating module as shown in equation (7) providing an output signal The connection terminals TA1, TB1, and TC1 maintain the turn-on state at all times and compare the second carrier signal among the gate signal generation modules to output the voltage of V _ON and provide a connection terminal TA2 Off signal is applied to the connection terminals TA2, TB2, and TC2 to output a voltage of 0V, and a turn-off signal is applied to the connection terminals TA1, TB2, and TC2.

The comparison module compares the reference signal with the carrier signal after the carrier signal is input to the inverting terminal and the reference signal (V _{X -Ref} ) is input to the non-inverting terminal. And provides an output signal for the output signal.

The PWM controller of the three-phase three-level power inverter of the present invention outputs the AC output voltage of high power quality directly using the different DC input voltage of the three-phase three-level inverter without any additional configuration of the DC power converter Maximum power operation and charge / discharge function can be performed.

Further, the present invention can reduce the harmonic components of the voltage current output from the three-phase three-level inverter, thereby reducing the size of the output filter, and improve the PWM control performance, reliability, There is an effect that life can be improved.

1 is a diagram for explaining a three-level voltage output state of a general three-phase three-level inverter.

2 is a diagram for explaining a configuration of a power conversion system including a general three-phase three-level inverter.

3 is a diagram illustrating a configuration of a PWM control apparatus of a three-phase three-level power conversion apparatus according to an embodiment of the present invention.

4 is a view for explaining an application state of a gate signal of the gate signal generation module of FIG.

5 is a view for explaining the operation of the PWM controller of the three-phase three-level power conversion apparatus according to the embodiment of the present invention.

6 is a diagram for explaining a state in which a reference signal according to an embodiment of the present invention passes through a region of the DC input voltage VC1.

7 is a view for explaining a state in which a reference signal according to an embodiment of the present invention passes through a region of the DC input voltage VC2.

FIG. 8 is a view for explaining a waveform of a first simulation result of a PWM control apparatus of a three-phase three-level power conversion apparatus according to an embodiment of the present invention.

8 is a view for explaining a waveform of a second simulation result of the PWM controller of the three-phase three-level power conversion apparatus according to the embodiment of the present invention.

The scope of the present invention is not limited to the embodiments and drawings described in the present specification, and the scope of the present invention is not limited to these embodiments. Should not be construed as limited by That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the relevant art and can not be construed as having ideal or overly formal meanings which are not expressly defined in the present invention.

3 is a view for explaining a configuration of a PWM control device of a three-phase three-level power conversion apparatus according to an embodiment of the present invention, and FIG. 4 is a view for explaining an application state of a gate signal of the gate signal generation module of FIG. to be.

3 and 4, the PWM control apparatus of the three-phase three-level power conversion apparatus includes a carrier signal generation module 110, a comparison module 120, and a gate signal generation module 130.

The carrier signal generation module 110 detects the DC input voltage when a DC voltage different from the neutral point is applied to the DC input voltage V _C1 and V _C2 and detects a duty ratio and a frequency according to the magnitude of the detected DC input voltage. And phases of the carrier signals VCarr1 and VCarr2 are different from each other.

That is, the carrier signal generation module 110 generates first and second carrier signals VCarr1 and VCarr2 in the form of a triangle wave having the same voltage magnitude as the DC input voltages V _C1 and V _C2 of the three-phase three-level inverter And generates a carrier signal by varying at least one of the duty ratio frequency and phase of the carrier signal according to each voltage magnitude.

The comparison module 120 uses the plurality of comparators to compare the first comparison group A1 and the second comparison group 121 and the second comparison group B1 and B2 122 and the third comparison group C1, And _outputs a first reference signal V _uRef , a second reference signal V _vRef , and a third reference signal V _wRef , which are different from each other by a predetermined phase value, to the first comparison group 121, The second comparison group 122, and the third comparison group 123, and a plurality of carrier signals are input to the first comparison group 121, the second comparison group 122, and the third comparison group 123 123) comparing a carrier signal of a reference signal (V _{X -Ref)} and the non-inverting terminal of the inverting terminal and then inputted to the non-inverting terminal of the samples to provide an output signal to the state high / low (high / low). Here, _{X of the} reference signal (V _{X - Ref} ) means U, V, W.

The first reference signal V _uRef , the second reference signal V _vRef , and the third reference signal V _wRef have phase differences of 2π / 3 with respect to the first and second carrier signals, respectively.

The first comparison group 121, the second comparison group 122 and the third comparison group 123 are composed of two comparators per group, and the first reference signal V _uRef is input to the first comparison group 121 and, first and a second reference signal (V _vRef) input to the second comparison group 122, the third reference signal (V _wRef) compared to group 3 (123) is input.

The comparison module 120 may receive the reference signal V _{X -Ref} at the non-inverting terminal and the carrier signal at the inverting terminal. However, signals of the same type are inputted to the non-inverting and inverting terminals of all the comparators of the comparing module 120, respectively.

The gate signal generating module 130 may be configured such that the first output line L1 and the second output line L2 are connected to the output terminal of the comparison module 120 and the first output line L1 is connected to the output of the comparison module 120 (IGBT) 140, and the second output line L2 applies a second gate signal having a complementary relationship to the first gate signal to the power switching element 140 .

The gate signal generating module 130 performs the turn-on operation and the turn-off operation of the power switching element 140 by the first comparison group 121, the second comparison group 122 and the third comparison group 123 / TA1, / TA2, / TA2, TB1, / TB1, TB2, / TB2, TC1, / TC1, TC2 and / TC2. At this time, as shown in FIG. 4, the three-phase three-level inverter includes a plurality of power switching elements 140. The power switching element 140 is provided with the first gate signals TA1, TA2, TB1, TB2, TC1 and TC2 through the first output line L1 and the second output line L2 includes the NOT gate / TA1, / TA2, / TB1, / TB2, / TC1 and / TC2 having a complementary relationship with the first gate signal.

5 is a view for explaining the operation of the PWM controller of the three-phase three-level power conversion apparatus according to the embodiment of the present invention.

5, the PWM controller of the three-phase three-level power inverter detects two different DC input voltages V _C1 and V _C2 on the input side in the carrier signal generation module 110, And generates first and second carrier signals in the form of a triangle wave corresponding to each voltage magnitude of the voltage. (S1, S2)

The comparison module 120 compares the first and second carrier signals with a first reference signal V _uRef , a second reference signal V _vRef , and a third reference signal V _wRef , each of which has a phase difference of 2? / 3 And outputs the amplified output signal (H or L) according to the comparison result. (S3)

The gate signal generation module 130 applies the output signal output from the comparison module 120 to the power switching device 140 as a first gate signal through the first output line L1, (S4), one of the comparators outputs an output signal to the first output line and the second output line, and the gate signal &lt; RTI ID = 0.0 &gt; Generating module 130 generates a gate signal that controls the power switching element 140 in a complementary relationship through the first output line and the second output line.

The operation principle of the 3-phase 3-level inverter to output the AC voltage using the different DC input voltage is as follows.

6 is a view for explaining a state in which the reference signal according to the embodiment of the present invention passes through the region of the DC input voltage V _C1 .

6, the AC output voltage V _O output at the voltage condition of the three level voltages (V _PN , V _ON , 0 V) applied at the DC input voltages (V _C1 , V _C2 ) in accordance with the carrier signal, a reference signal (V _{X _Ref)} that passes through the region of (VCarr1, VCarr2) there is synthesized using a 3-level voltage _{(V PN, V oN, 0V} ), the reference signal (V _{X _Ref)} a first direct current input When passing the voltage (V _C1 ), that is, when V _PN <V _{X _Ref} <V _ON The comparator of A1, B1, and C1 outputs a gate signal by comparing the first carrier signal VCarr1, which oscillates between V _PN and V _ON , with a reference voltage, and the ac output voltage V _O is expressed by the following equation .

[Equation 1]

A reference signal (V _{X _Ref)} a first carrier signal (VCarr1) while passing through the area, as shown in equation (2), the second carrier signal (VCarr2) gate signal TA2, TB2, TC2 for providing an output signal by comparing the The gate signals of TA1, TB1, and TC1 for comparing the first carrier signals to output an output signal to maintain the turn-on state at all times and output the voltage of V _{PN apply} a turn-on signal, and V _ON The gate signals of TA1, TB1, and TC1 apply the turn-off signal to output the voltage of the transistors TA1, TB1, and TC1.

&Quot; (2) &quot;

The slope of the first carrier signal (V _C1 / T _S ) and the slope of the carrier signal higher than the reference signal during the T1 time are the same during the entire switching time (TS) of one period,

&Quot; (3) &quot;

The average AC output voltage _{(V 0 (Avg))} is equal to equation (4), the total switching time (T _S = T1 + T2) using the conditions the average AC output voltage _{(V 0 (Avg))} as shown in equation (5) and It can be seen that the reference signal V _{x _Ref} is the same.

&Quot; (4) &quot;

&Quot; (5) &quot;

7 is a view for explaining a state in which a reference signal according to an embodiment of the present invention passes through a region of a DC input voltage V _C2 .

7, when the reference signal _VxRef passes through the second DC input voltage V _C2 , that is, V _oN <V _{X _Ref} <0 V If the comparator of A2, B2, and C2 is V _ON And a second carrier signal (VCarr2) and compared to a reference voltage to output a gate signal, and the AC output voltage (V _O) is to the equation (6), and as V _ON and 0V is synthesized voltage is output to and from the between 0V do.

&Quot; (6) &quot;

During the reference signal (V _{X _Ref)} is passing through the second carrier signal (VCarr2) region, TA1 for providing an output signal by comparing a first carrier signal (VCarr1) and the reference signal as shown in Equation 7, TB1, TC1 The gate signals of TA2, TB2, and TC2 to compare the second carrier signals to output the voltage of V _ON and to provide the output signals maintain a turn-on state at all times, and apply a turn-on signal , The gate signals of TA2, TB2, and TC2 apply a turn-off signal to output a voltage of 0V.

&Quot; (7) &quot;

The slope (V _C2 / T _S ) of the second carrier signal and the slope of the carrier signal higher than the reference signal during the T1 time are the same during the entire switching time (TS) of one period, so that a relationship as shown in Equation (8) is established.

&Quot; (8) &quot;

The average AC output voltage _{(V 0 (Avg))} is the same as Equation 9, using the total switching time (T _S = T1 + T2) condition average AC output voltage _{(V 0 (Avg))} as shown in equation (10) and It can be seen that the reference signal V _{x _Ref} is the same.

&Quot; (9) &quot;

&Quot; (10) &quot;

The PWM switching table for the 12 gate signals according to the AC output voltage (VO) is shown in Table 1 below.

TA1 TB1 TC1	TA2 TB2 TC2	/ TA1 / TB1 / TC1	/ TA2 / TB2 / TC2	VO
H	H	L	L	VPN
L	H	H	L	VON
L	L	H	H	OV

FIG. 8 is a view for explaining a waveform of a first simulation result of the PWM control apparatus of the three-phase three-level power conversion apparatus according to the embodiment of the present invention, and FIG. 8 is a diagram illustrating waveforms of three- Fig. 8 is a diagram for explaining a waveform of a second simulation result of the PWM control device of the conversion apparatus; Fig.

8 shows a first simulation result in which a PWM control device is applied to a three-phase three-level inverter (L = 1.5 mH, R = 10?) When different first and second DC input voltages are V _C1 = 200 V and V _C2 = Wave form and is a second simulation result waveform in which a PWM control device is applied to a three-phase three-level inverter (L = 1.5 mH, R = 10?) In the case of V _C1 = 350 V and V _C2 = 150 V as shown in FIG. 9 .

As shown in FIGS. 8 and 9, it can be seen that the three-phase currents I _A , I _B , and I _C output from the three-phase three-level inverter have sinusoidal fundamental waveforms irrespective of the different DC input voltages . The voltage (V _AN) is the output voltage relative to the 0V, the average voltage (V _AN-Avg) may also be found to have a sinusoidal base waveform. V _AB represents the line voltage of the three-phase output voltage.

Through the PWM controller of the three-phase three-level power converter, the harmonics of the output voltage and current are reduced and the linearity of the three-phase three-level inverter is increased regardless of the different DC input voltage conditions .

The PWM controller of the three-phase three-level power inverter of the present invention can be equally applied to a solar inverter constituted by three-phase three-level, a charge / discharge converter of a battery-connected system, a rectifier of a DC microgrid system, and a rectifier for a ship .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

110: carrier signal generating module

120: Comparison module

130: Gate signal generating module

140: Power switching element

Claims (12)

1. The first and second DC input voltages are detected when different DC voltages are applied to the first and second DC input voltages V _C1 and V _C2 on the basis of the neutral point and the magnitudes of the first and second DC input voltages A carrier signal generation module for generating and providing first and second carrier signals VCarr1 and VCarr2 so that at least one of the duty ratio, the frequency, and the phase is different according to the carrier frequency;

   A first comparison group, a second comparison group and a third comparison group are formed using a plurality of comparators, a first reference signal (V _uRef ) having a difference by a predetermined phase value from the first and second carrier signals, 2 reference signal (V _vRef ) and a third reference signal (V _wRef ) to the inverted terminals of the first comparison group, the second comparison group and the third comparison group, respectively, (V _{X -Ref} ) of the inverting terminal and the carrier signal of the non-inverting terminal are compared with each other to determine a high / low (High / Low) state A comparison module for providing an output signal to the output module; And

   A first output line and a second output line are connected to an output terminal of the comparison module and the first output line applies an output signal of the comparison module to a power switching element as a first gate signal, And a gate signal generating module for applying a second gate signal having a complementary relationship with the first gate signal to the power switching device.
2. The method according to claim 1,

   The carrier signal generation module includes:

   And generates carrier signals VCarr1 and VCarr2 in the form of triangular waves that are the same as the voltage magnitudes of the first and second DC input voltages V _C1 and V _C2 and generates one of the duty ratio frequency and phase of the carrier signal Phase three-level power conversion apparatus according to claim 1, wherein the carrier signal is generated by changing the phase of the carrier signal.
3. The method according to claim 1,

   _Wherein the first reference signal V _uRef , the second reference signal V _vRef , and the third reference signal V _wRef have phase differences of 2π / 3 with the first and second carrier signals, respectively. PWM controller for phase 3-level power inverter.
4. The method according to claim 1,

   A second reference to the first comparison group, the second comparative group, and the third comparative group, and the first reference signal (V _uRef) input to include two comparators per group, and the first comparison group, the second comparative group signal (V _vRef) are inputted, the PWM control of a three-phase three-level power converting apparatus which is characterized in that the third reference signal (V _wRef) input to the third comparison device group.
5. 5. The method of claim 4,

   The gate signal generation module generates 12 gate signals TA1, / TA1, and TA2 for turn-on and turn-off operations of the power switching device by the first comparison group, the second comparison group, Phase three-level power conversion apparatus according to claim 1, wherein the PWM control unit is configured to output the PWM signals TA2, / TA2, TB1, / TB1, TB2, / TB2, TC1, / TC1, TC2 and / TC2.
6. The method according to claim 1,

   And the second output line comprises a NOT gate. &Lt; Desc / Clms Page number 13 &gt;
7. The method according to claim 1,

   The AC output voltage V _O outputted under the voltage condition of the three level voltages V _PN , V _ON and 0 V applied from the DC input voltages V _C1 and V _C2 is the same as the first and second carrier signals VCarr1 (V _PN , V _ON , 0V) according to the first reference signal (V _uRef ), the second reference signal (V _vRef ), and the third reference signal (V _wRef ) Phase three-level power conversion apparatus.
8. 8. The method of claim 7,

   When the first reference signal V _uRef , the second reference signal V _vRef , and the third reference signal V _{wRef pass} the first DC input voltage V _C1 , that is, V _PN <V _{X _Ref} <V _ON The comparison module compares the first carrier signal VCarr1, which oscillates between V _PN and V _ON , with a reference voltage to output a gate signal, and the AC output voltage V _O is given by V _{PN =} V _ON to output the synthesized voltage,

   [Mathematical Expression]

   

   _{Wherein X in} the reference signal (V _{X - Ref} ) is U, V, W.
9. 9. The method of claim 8,

   Said reference signal (V _{X _Ref)} a first carrier signal (VCarr1) connectors during passing through the area, and to a comparison of the second carrier signal (VCarr2) of the gate signal generating module as mathematical expressions and providing an output signal (TA2, TB2, TC2) is always turned on, maintaining the on-state, and the connection for outputting the voltage V _PN as compared to the first carrier signal of the gate signal generation module that provides an output signal terminal (TA1, TB1 , And a turn-off signal is applied to the connection terminals TA1, TB1, and TC1 to output a voltage of V _ON

   [Mathematical Expression]

   

   And the PWM control unit of the phase 3-level inverter.
10. 8. The method of claim 7,

    When the first reference signal V _uRef , the second reference signal V _vRef , and the third reference signal V _{wRef pass} the second DC input voltage V _C2 , that is, V _oN <V _{X _Ref} <0 V The comparison module determines that V _ON And a second carrier signal (VCarr2) and compared to a reference voltage to output a gate signal, and the AC output voltage (V _O) is to output a voltage synthesis using the V _ON and 0V as mathematical expressions and that reciprocates between 0V and,

    [Mathematical Expression]

    

    _{Wherein X in} the reference signal (V _{X - Ref} ) is U, V, W.
11. 11. The method of claim 10,

    Said reference signal (V _{X _Ref)} a second carrier signal (VCarr2) connectors during passing through the area, and to a comparison of said first carrier signal (VCarr1) of the gate signal generating module as mathematical expressions and providing an output signal (TA1, TB1, TC1) maintains a turn-on state at all times, and compares the second carrier signal among the gate signal generation modules to output a voltage of V _ON , , A turn-on signal is applied to the connection terminals TA2, TB2, and TC2 to output a voltage of 0V,

    [Mathematical Expression]

    

    And the PWM control unit of the phase 3-level inverter.
12. The method according to claim 1,

    The comparison module compares the reference signal with the carrier signal after the carrier signal is input to the inverting terminal and the reference signal (V _{X -Ref} ) is input to the non-inverting terminal. Phase three-level power conversion apparatus.

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