CN110022080B - Photovoltaic inverter with arc extinction function and dead-beat control method thereof - Google Patents

Photovoltaic inverter with arc extinction function and dead-beat control method thereof Download PDF

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CN110022080B
CN110022080B CN201910311171.9A CN201910311171A CN110022080B CN 110022080 B CN110022080 B CN 110022080B CN 201910311171 A CN201910311171 A CN 201910311171A CN 110022080 B CN110022080 B CN 110022080B
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inverter
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reactance
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CN110022080A (en
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胡龙
王新梅
熊益红
梁富光
郑建国
鞠磊
黄鑫
丘汉标
林传霖
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State Grid Fujian Electric Power Co Ltd
Nanping Power Supply Co of State Grid Fujian Electric Power Co Ltd
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State Grid Fujian Electric Power Co Ltd
Nanping Power Supply Co of State Grid Fujian Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/60—Planning or developing urban green infrastructure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention relates to a photovoltaic inverter with an arc extinction function and a dead-beat control method thereof, and firstly provides a three-phase four-wire inverter structure with an arc extinction function, which can not only convert the energy output by a photovoltaic panel into a power grid system, but also compensate the capacitance current of a butt joint point when a single-phase earth fault occurs in an ungrounded system. Then, a power feed-forward deadbeat current control method based on single-phase earth fault is proposed for the structure. The method not only can quickly track the instruction current, but also can continuously and dynamically compensate the capacitance current of the grounding point. Meanwhile, the invention integrates arc extinction and inversion, thereby effectively saving the cost.

Description

Photovoltaic inverter with arc extinction function and dead-beat control method thereof
Technical Field
The invention relates to the technical field of relay protection and power electronics, in particular to a photovoltaic inverter with an arc extinction function and a dead-beat control method thereof.
Background
In the ungrounded system, when a single-phase grounding fault occurs in a line, the voltage of the system line is still symmetrical, so that the ungrounded system can continue to operate for 1-2 hours when the single-phase grounding fault occurs, but the problems of arc light, resonance overvoltage and the like can be generated at a fault point. At present, the solution in China is to connect an arc suppression coil at a neutral point. And the compensation of the capacitance current of the butt joint point is realized by adjusting the inductive reactance of the arc suppression coil. With the continuous access of the photovoltaic power supply to the ungrounded power grid system, the function of the photovoltaic power supply is to convert the energy output by the photovoltaic panel into alternating current required by the power grid, and the photovoltaic power supply is single in function. The arc extinction and inversion functions are respectively realized by two different power devices, thus the investment cost is invisibly increased.
The disadvantages of the prior art are as follows:
(1) the function is single. At present, the arc extinction function in an ungrounded system in China is realized by an arc extinction coil connected to a neutral point. Meanwhile, the photovoltaic inverter only has the function of converting direct current generated by the photovoltaic panel into alternating current required by a power grid. Therefore, they are relatively simple in function.
(2) Low precision and discontinuous adjustment. At present, arc suppression coils in China mainly adopt a pounding regulation mode and a capacitance regulation mode, and the pounding regulation mode and the capacitance regulation mode respectively change inductive reactance by regulating the gear of a neutral point reactor so as to achieve the purpose of controlling residual current; the residual current of the grounding point is controlled by adjusting the secondary capacitive reactance of the arc suppression coil. The two kinds of arc suppression coils have the problems of low precision, discontinuous adjustment and the like.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a photovoltaic inverter with arc extinction function and a dead-beat control method thereof, which can compensate capacitance current at a butt joint point when a single-phase ground fault occurs in an ungrounded system, so as to achieve an arc extinction function.
The invention is realized by adopting the following scheme: a photovoltaic inverter with arc extinction function provides a three-phase four-wire inverterComprises a DC power supply, a first capacitor C1A second capacitor C2First IGBTTa1A second IGBTTb1The third IGBTTc1Fourth IGBTTa2Fifth IGBTTb2Sixth IGBTTc2A first reactance L1A second reactance L2A third reactance L3And a fourth reactance L4(ii) a The first capacitor C1And the second capacitor C2Is connected to the fourth reactance L4Is connected with one end of the connecting rod; the fourth reactance L4The other end of the first and second electrodes is grounded; the first capacitor C1Another end of (1), the first IGBTTa1The second IGBTTb1And the third IGBTTc1The collector electrodes of the two-phase current transformer are all connected with the positive electrode of the direct current power supply; the second capacitor C2The other end of (1), the fourth IGBTTa2The fifth IGBTTb2And the sixth IGBTTc2The emitting electrodes of the two-way switch are all connected with the negative electrode of the direct current power supply; the first IGBTTa1And the fourth IGBTTa2Are all connected to the first reactance L1And through said first reactance L1Connecting with A of three-phase power of a power grid ungrounded system; the second IGBTTb1And the fifth IGBTTb2Are all connected to the second reactance L2And through said second reactance L2B is connected with a non-grounded system of the power grid; the third IGBTTc1And the sixth IGBTTc2Are all connected to the third reactance L3And through said third reactance L3And C, connecting with a non-grounding system of the power grid.
Further, the first IGBTTa1The second IGBTTb1The third IGBTTc1The fourth IGBTTa2The fifth IGBTTb2And the sixth IGBTTc2Both the collector and the emitter of the diode are connected in parallel with a diode.
Further, the invention also provides a deadbeat control method of the photovoltaic inverter with the arc extinction function, which specifically comprises the following steps:
step S1: modeling the three-phase four-wire inverter by utilizing a kirchhoff voltage law to obtain an equivalent circuit of the three-phase four-wire inverter;
step S2: enabling the output power of the three-phase four-wire inverter to be P, enabling the switching loss of the inverter to be 0, and obtaining a command signal of a phase current peak value on the side of a power grid according to an energy conservation principle;
Im＝2P/(3Um) (1)
step S3: a proportional-integral regulator is adopted to regulate the outer ring of the DC side voltage of the inverter so as to maintain the stability of the DC side voltage of the inverter and make up the energy loss of the whole inverter;
Iout＝KPΔUdc+KI∫ΔUdcdt (2)
step S4: calculating the active current component of the PWM rectifier network side by the formula (1), and obtaining the current regulation signal of the direct current side voltage by the formula (2), wherein the total active current component signal is as follows:
IP＝Im+Iout
step S5: the total active current component signal I obtained in the step S4 is processedPAnd multiplying the synchronous signals namely sin (ω t), sin (ω t-2 π/3) and sin (ω t +2 π/3) respectively to obtain the active current signal output by the inverter:
Figure BDA0002030983620000031
when the power system operates in single-phase grounding mode, a high-frequency constant-current signal i is superposed in the phase current output by the inverter0Obtaining i in each branch by measurement0The size and variation characteristics of the fault line are selected, in this case i0The cable is used for selecting the cable; the capacitance current to ground when the single-phase earth fault of the power system is as follows:
Figure BDA0002030983620000041
the total output current signal of the inverter is then:
Figure BDA0002030983620000042
in the formula: i ═ IcAnd/3, one third of the sum of capacitance currents formed by the capacitors C which are distributed in the non-fault phase-to-phase mode of the whole network.
Further, the specific content of step S1 is:
Figure BDA0002030983620000043
VAo、VBo、VCothe three-phase voltage of the power grid is obtained; l is1、L2、L3Respectively an inverter filter reactance; i.e. ia、ib、icAnd inRespectively outputting current for the inverters; t isa1、Tb1、Tc1、Ta2、Tb2、Tc2Respectively, are IGBT switching tube driving signals.
Further, the specific content of step S2 is:
according to the principle of energy conservation, the method comprises the following steps:
(3UmIm cosθ)/2＝P
Umfor peak values of the mains phase voltage, ImA command signal of a peak value of the phase current on the side of the power grid, wherein theta is a power factor angle, the power factor angle theta is 0, and cos theta is 1; therefore, a command signal I of a phase current peak value on the side of the power grid is obtainedm＝2P/(3Um)。
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention can not only convert the energy output by the photovoltaic panel into a power grid system, but also compensate the capacitance current of a butt joint point when a single-phase earth fault occurs in an ungrounded system, thereby achieving the function of arc extinction.
(2) The invention provides a three-phase four-wire inverter structure with an arc extinction function aiming at the problems of low precision, discontinuous adjustment and the like, and provides a power feed-forward deadbeat current control method based on single-phase ground fault aiming at the structure.
Drawings
Fig. 1 is a schematic diagram of a three-phase four-wire inverter circuit with arc extinction and line selection functions according to an embodiment of the invention.
Fig. 2 is an equivalent circuit diagram of a three-phase four-wire inverter according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of compensation in a single-phase ground fault according to an embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
As shown in FIG. 1, the embodiment provides a photovoltaic inverter with arc extinction function, and provides a three-phase four-wire inverter comprising a direct current power supply, a first capacitor C1A second capacitor C2First IGBTTa1A second IGBTTb1The third IGBTTc1Fourth IGBTTa2Fifth IGBTTb2Sixth IGBTTc2A first reactance L1A second reactance L2A third reactance L3And a fourth reactance L4(ii) a The first capacitor C1And the second capacitor C2Is connected to the fourth reactance L4Is connected with one end of the connecting rod; the fourth reactance L4The other end of the first and second electrodes is grounded; the first capacitor C1Another end of (1), the first IGBTTa1The second IGBTTb1And the third IGBTTc1The collector electrodes of the two-phase current transformer are all connected with the positive electrode of the direct current power supply; the second capacitor C2The other end of (1), the fourth IGBTTa2The fifth IGBTTb2And the sixth IGBTTc2The emitting electrodes of the two-way switch are all connected with the negative electrode of the direct current power supply; the first IGBTTa1And the fourth IGBTTa2All the collector electrodes ofIs connected to the first reactance L1And through said first reactance L1Connecting with A of three-phase power of a power grid ungrounded system; the second IGBTTb1And the fifth IGBTTb2Are all connected to the second reactance L2And through said second reactance L2B is connected with a non-grounded system of the power grid; the third IGBTTc1And the sixth IGBTTc2Are all connected to the third reactance L3And through said third reactance L3And C, connecting with a non-grounding system of the power grid.
Further, the first IGBTTa1The second IGBTTb1The third IGBTTc1The fourth IGBTTa2The fifth IGBTTb2And the sixth IGBTTc2Both the collector and the emitter of the diode are connected in parallel with a diode.
Preferably, in order to implement the fast dynamic response performance and the arc extinction and line selection function of the inverter power supply, the embodiment further provides a deadbeat control method for the photovoltaic inverter with the arc extinction function, which specifically includes the following steps:
step S1: modeling the three-phase four-wire inverter by using kirchhoff's voltage law to obtain an equivalent circuit of the three-phase four-wire inverter, as shown in fig. 2;
when a single-phase earth fault occurs in the ungrounded system, the load component of the ungrounded system is always the positive sequence component, so that the active power output of the inverter only needs to consider the positive sequence component of the bus voltage, and the positive sequence component is kept unchanged in the whole process, so that the positive sequence power output by the inverter power supply is kept unchanged. When the system operates in single-phase ground, the positive sequence power remains unchanged. At the moment, the control on the in can be realized by changing the conducting state of the power device, and finally the compensation of the capacitance current of the butt joint point is achieved. The compensation principle is shown in fig. 3. As can be seen from the figure, the current at the grounding point K is composed of two parts, one part is the sum of capacitance currents formed by the capacitors C distributed in the non-fault phase of the whole network; the other part is the compensating current i output by the invertern. Grounding at fault point KMagnitude of current IkComprises the following steps:
Figure BDA0002030983620000071
by regulating inverter inTo achieve compensation for the capacitor current. The inverter power supply with the arc extinction function can continuously and dynamically compensate, and can reduce the residual current of a single-phase grounding point to the maximum extent.
Step S2: assuming that the output power of the inverter is P, under an ideal condition, the switching loss of the inverter is considered to be 0, and obtaining a command signal of a phase current peak value on the side of the power grid according to an energy conservation principle;
Im＝2P/(3Um) (1)
step S3: a proportional-integral regulator is adopted to regulate the outer ring of the DC side voltage of the inverter so as to maintain the stability of the DC side voltage of the inverter and make up the energy loss of the whole inverter;
Iout＝KPΔUdc+KI∫ΔUdcdt (2)
step S4: calculating the active current component of the PWM rectifier network side by the formula (1), and obtaining the current regulation signal of the direct current side voltage by the formula (2), wherein the total active current component signal is as follows:
IP＝Im+Iout
step S5: the total active current component signal I obtained in the step S4 is processedPAnd multiplying the respective synchronous signals, namely sin (ω t), sin (ω t-2 π/3) and sin (ω t +2 π/3), to obtain an active current signal output by the inverter:
Figure BDA0002030983620000081
when the power system operates in single-phase grounding mode, a high-frequency constant-current signal i is superposed in the phase current output by the inverter0Obtaining i in each branch by measurement0The size and variation characteristics of the fault line are selected, in this case i0The cable is used for selecting the cable; the capacitance current to ground when the single-phase earth fault of the power system is as follows:
Figure BDA0002030983620000082
the total output current signal of the inverter is then:
Figure BDA0002030983620000083
in the formula: i ═ IcAnd/3, one third of the sum of capacitance currents formed by the capacitors C which are distributed in the non-fault phase-to-phase mode of the whole network.
In this embodiment, the specific content of step S1 is:
Figure BDA0002030983620000091
VAo、VBo、VCothe three-phase voltage of the power grid is obtained; l is1、L2、L3Respectively an inverter filter reactance; i.e. ia、ib、icAnd inRespectively outputting current for the inverters; t isa1、Tb1、Tc1、Ta2、Tb2、Tc2Respectively are IGBT switching tube driving signals; the power switching device as shown in fig. 1 uses an IGBT module; c1、C2Is a DC side voltage-stabilizing capacitor and C1＝C2(ii) a E is a direct current power supply.
In this embodiment, the specific content of step S2 is:
according to the principle of energy conservation, the method comprises the following steps:
(3UmIm cosθ)/2＝P
Umfor peak values of the mains phase voltage, ImA command signal of a peak value of the phase current on the side of the power grid, wherein theta is a power factor angle, the power factor angle theta is 0, and cos theta is 1; therefore, a command signal I of a phase current peak value on the side of the power grid is obtainedm＝2P/(3Um)。
In particular, the embodiment can not only convert the energy output by the photovoltaic panel into the power grid system, but also compensate the capacitance current of the grounding point when a single-phase grounding fault occurs in the ungrounded system. The three-phase four-wire inverter structure with the arc extinction function is provided for the first time, and a power feedforward deadbeat current control method based on single-phase earth faults is provided for the structure. The method not only can quickly track the instruction current, but also can continuously and dynamically compensate the capacitance current of the grounding point. Meanwhile, the arc extinction and the inversion are integrated, so that the cost is effectively saved. The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims (4)

1. A deadbeat control method of a photovoltaic inverter with an arc extinction function is characterized by comprising the following steps: a three-phase four-wire inverter is provided, which comprises a DC power supply, a first capacitor C1A second capacitor C2First IGBTTa1A second IGBTTb1The third IGBTTc1Fourth IGBTTa2Fifth IGBTTb2Sixth IGBTTc2A first reactance L1A second reactance L2A third reactance L3And a fourth reactance L4(ii) a The first capacitor C1And the second capacitor C2Is connected to the fourth reactance L4Is connected with one end of the connecting rod; the fourth reactance L4The other end of the first and second electrodes is grounded; the first capacitor C1Another end of (1), the first IGBTTa1The second IGBTTb1And the third IGBTTc1The collector electrodes of the two-phase current transformer are all connected with the positive electrode of the direct current power supply; the second capacitor C2The other end of (1), the fourth IGBTTa2The fifth IGBTTb2And the sixth IGBTTc2The emitting electrodes of the two-way switch are all connected with the negative electrode of the direct current power supply; the first IGBTTa1And the fourth IGBTTa2Are all connected to the first reactanceL1And through said first reactance L1Connecting with A of three-phase power of a power grid ungrounded system; the second IGBTTb1And the fifth IGBTTb2Are all connected to the second reactance L2And through said second reactance L2B is connected with a non-grounded system of the power grid; the third IGBTTc1And the sixth IGBTTc2Are all connected to the third reactance L3And through said third reactance L3C, connecting with a power grid ungrounded system;
the method specifically comprises the following steps:
step S1: modeling the three-phase four-wire inverter by utilizing a kirchhoff voltage law to obtain an equivalent circuit of the three-phase four-wire inverter;
step S2: enabling the output power of the three-phase four-wire inverter to be P, enabling the switching loss of the inverter to be 0, and obtaining a command signal of a phase current peak value on the side of a power grid according to an energy conservation principle;
Im＝2P/(3Um) (1)
wherein, UmThe peak value of the grid phase voltage is obtained;
step S3: a proportional-integral regulator is adopted to regulate the outer ring of the DC side voltage of the inverter so as to maintain the stability of the DC side voltage of the inverter and make up the energy loss of the whole inverter;
Iout＝KPΔUdc+KI∫ΔUdcdt (2)
step S4: calculating a command signal of the power grid side phase current peak value of the three-phase four-wire inverter by using the formula (1), and obtaining a current regulation signal of direct-current side voltage by using the formula (2), wherein the total active current component signal is as follows:
IP＝Im+Iout
step S5: the total active current component signal I obtained in the step S4 is processedPAnd multiplying the synchronous signals namely sin (ω t), sin (ω t-2 π/3) and sin (ω t +2 π/3) respectively to obtain the active current signal output by the inverter:
Figure FDA0002775482210000021
when the power system operates in single-phase grounding mode, a high-frequency constant-current signal i is superposed in the phase current output by the inverter0Obtaining i in each branch by measurement0The size and variation characteristics of the fault line are selected, in this case i0The cable is used for selecting the cable; the capacitance current to ground when the single-phase earth fault of the power system is as follows:
Figure FDA0002775482210000022
the total output current signal of the inverter is then:
Figure FDA0002775482210000031
in the formula: i ═ IcAnd/3, one third of the sum of capacitance currents formed by the capacitors C which are distributed in the non-fault phase-to-phase mode of the whole network.
2. The deadbeat control method of a photovoltaic inverter with arc suppression function according to claim 1, characterized in that: the first IGBTTa1The second IGBTTb1The third IGBTTc1The fourth IGBTTa2The fifth IGBTTb2And the sixth IGBTTc2Both the collector and the emitter of the diode are connected in parallel with a diode.
3. The deadbeat control method of a photovoltaic inverter with arc suppression function according to claim 1, characterized in that: the specific content of step S1 is:
Figure FDA0002775482210000032
VAo、VBo、VCothe three-phase voltage of the power grid is obtained; l is1、L2、L3Respectively an inverter filter reactance; i.e. ia、ib、icAnd inRespectively the output current of the inverter, parameter Uan、Ubn、UcnVoltage drops between three-phase bridge arms of a three-wire four-phase inverter a, b and c and n-phase bridge arms respectively; u shapenoThe voltage drop between the n-phase bridge arm of the three-wire four-phase inverter and the ground.
4. The deadbeat control method of a photovoltaic inverter with arc suppression function according to claim 1, characterized in that: the specific content of step S2 is:
according to the principle of energy conservation, the method comprises the following steps:
(3UmImcosθ)/2＝P
Umfor peak values of the mains phase voltage, ImA command signal of a peak value of the phase current on the side of the power grid, wherein theta is a power factor angle, the power factor angle theta is 0, and cos theta is 1; therefore, a command signal I of a phase current peak value on the side of the power grid is obtainedm＝2P/(3Um)。
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