CN111327081A - Control method of two-phase three-wire inverter - Google Patents
Control method of two-phase three-wire inverter Download PDFInfo
- Publication number
- CN111327081A CN111327081A CN202010116600.XA CN202010116600A CN111327081A CN 111327081 A CN111327081 A CN 111327081A CN 202010116600 A CN202010116600 A CN 202010116600A CN 111327081 A CN111327081 A CN 111327081A
- Authority
- CN
- China
- Prior art keywords
- current
- phase
- power
- grid
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 3
- 230000010363 phase shift Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000001939 inductive effect Effects 0.000 abstract description 5
- 238000000354 decomposition reaction Methods 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
Abstract
The invention relates to the technical field of power electronics, in particular to a control method of a two-phase three-wire inverter, which comprises the following steps: step A, sampling the voltage of a power grid to obtain the phase information of the current power grid; sampling voltage and current information in real time to calculate the current actual power factor, and calculating the phase offset according to the calculated actual power factor to be superposed and added into the phase information of the power grid; meanwhile, power factor setting is added, and phase offset is calculated according to the power factor set by a user and added into the phase information of the power grid in a superposed manner; synthesizing three input source information, outputting locked phase information Sin/Cos, and outputting another path of network voltage phase information NSin/NCos through phase conversion; the method adopts a current acquisition strategy combining automatic load power tracking and grid-connected power setting; orthogonal decomposition of inductive current is adopted, active current and reactive current control are taken into consideration, and requirements of different working conditions are met; and the load current is superposed to feed forward, so that the load change is quickly responded.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a control method of a two-phase three-wire inverter.
Background
At present, the power electronic technology is rapidly developed, the grid-connected inverter technology is increasingly improved, the control technology comprises P/Q, d/q, V/F, PI, fuzzy control, SVPWM and the like, but at present, the mainstream products of the inverter in China are concentrated on a single-phase inverter and a three-phase inverter, and the grid-connected inverter is suitable for a two-phase three-wire system distribution network in North America and is rarely sold. Two-phase three-line type is widely adopted in the voltage of the domestic distribution network in North America, namely the voltage consists of double live wires and zero lines with the phase difference of 180 degrees, and the current domestic inverters are mainly divided into single-phase inverters and three-phase inverters, and few inverters are matched with the distribution network mode. Therefore, for the distribution network mode of two-phase and three-wire in north america, a matched inverter needs to be developed to open the north american market.
Disclosure of Invention
The invention provides a control method of a two-phase three-wire inverter aiming at the problems in the prior art, the phase of a power grid is locked in real time, and a current acquisition strategy combining automatic load power tracking and grid-connected power setting is adopted; orthogonal decomposition of inductive current is adopted, active current and reactive current control are taken into consideration, and requirements of different working conditions are met; and the superposed load current feedforward quickly responds to load change on the premise of ensuring phase following.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a control method of a two-phase three-wire inverter, which comprises the following steps:
step A, sampling the voltage of a power grid to obtain the phase information of the current power grid; sampling voltage and current information in real time to calculate the current actual power factor, and calculating the phase offset according to the calculated actual power factor to be superposed and added into the phase information of the power grid; meanwhile, power factor setting is added, and phase offset is calculated according to the power factor set by a user and added into the phase information of the power grid in a superposed manner; synthesizing three input source information, outputting locked phase information Sin/Cos, and outputting another path of network voltage phase information NSin/NCos through phase conversion;
b, calculating load power in real time according to the sampled load voltage and load current, superposing user grid-connected set power to generate current required total power, and calculating required target current sizes Iref1 and Iref2 according to the current power grid voltage;
step C, sampling inductor currents IL1 and IL2, performing phase shift processing to complete Clark conversion, generating orthogonal current components α 1 and β 1, α 2 and β 2, then performing comprehensive calculation with the phase information output in the step 1, performing Park conversion to generate an active current component D1 and a reactive current component Q1, an active current component D2 and a reactive current component Q2 in a rotating coordinate system, and converting the alternating current into direct current to process to obtain actual active current and actual reactive current;
step D, taking Iref1 and Iref2 in the step B as given quantities and taking the difference with the actual active current obtained by calculation in the step C to control the active current through PID; c, after the Q1 given value and the Q2 given value are used as given quantities and are subjected to PID control after being subjected to difference with the actual reactive current sample obtained by calculation in the step C, the reactive current is controlled;
and step E, generating modulated wave signals PwmDuty1 and PwmDuty2, comparing the modulated wave signals PwmDuty1 and PwmDuty2 with a triangular carrier, combining the wave transmission time sequence of the three-level half-bridge circuit, increasing the dead time, and generating PWM signals Plus1 and Plus2 for controlling the power device.
Wherein, the phase shift amount in the step A
Wherein η is the power factor.
Wherein the total power P in the step BGeneral assembly＝Pset+PlasdWherein P issetIs the real-time power of the load, PloadAnd setting power for grid connection of a user.
The formula of the required target current magnitudes Iref1 and Iref2 in the step B is as follows:
wherein, Ugrid1And Ugrid2Are the current grid voltage.
Wherein, the formula for converting the ac quantity into the dc quantity in step C is:
wherein, IdIs the actual active current, IqIs the actual reactive current.
Wherein, the modulated wave signals PwmDuty1 and PwmDuty2 generated in step E are generated by inverse Park transform according to the output result in step D and the phase information output in step a, and the generation formula is:
the invention has the beneficial effects that:
the method adopts a three-level topology of interconnection of an alternating current midpoint and a direct current midpoint, locks the phase of a power grid in real time on the basis of a software phase-locked loop with phase compensation and power factor setting, and adopts a current acquisition strategy combining automatic load power tracking and grid-connected power setting; orthogonal decomposition of inductive current is adopted, active current and reactive current control are taken into consideration, and requirements of different working conditions are met; and the superposed load current feedforward quickly responds to load change on the premise of ensuring phase following.
Drawings
FIG. 1 is a schematic flow chart of step A of the present invention.
FIG. 2 is a schematic flow chart of step B of the present invention.
FIG. 3 is a flow chart of step C of the present invention.
FIG. 4 is a flow chart illustrating step E of the present invention.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.
A control method of a two-phase three-wire inverter comprises the following steps:
step A, as shown in a working schematic diagram of a phase locking module in FIG. 1, the grid voltage is sampled and then sent to an SPLL module, so that current grid phase information can be obtained; in view of differences of two paths of inductors, a driving circuit and a power device and PWM dead zone influence, the current actual power factor is calculated according to real-time sampling voltage and current information, and phase offset is calculated according to the calculated actual power factor and added into power grid phase information in an overlapping mode; meanwhile, power factor setting is added, and phase offset is calculated according to the power factor set by a user and added into the phase information of the power grid in a superposed manner; healdCombining three input source information, outputting locked phase information Sin/Cos, and outputting another path of network voltage phase information NSin/NCos through phase conversion; wherein, the phase shift amount in the step A
Wherein η is the power factor;
step B, as shown in fig. 2, calculating load power in real time according to the sampled load voltage and load current, superimposing the user grid-connected set power to generate the current required total power, and calculating the required target current sizes Iref1 and Iref2 according to the current grid voltage; wherein the total power P in the step BGeneral assembly＝Pset+PlasdWherein P issetIs the real-time power of the load, PloadSetting power for user grid connection; the formula of the required target current magnitudes Iref1 and Iref2 in the step B is as follows:
wherein, Ugrid1And Ugrid2The current grid voltage is the current grid voltage;
step C, as shown in FIG. 3, which is a working schematic diagram of a coordinate transformation and PID control module, the inductive currents IL1 and IL2 are sampled, Clark transformation is performed to complete Clark transformation, orthogonal current components α 1 and β 1, α 2 and β 2 are generated, then, the Clark transformation is performed to perform comprehensive calculation with the phase information output in step 1, Park transformation is performed to generate an active current component D1 and a reactive current component Q1, an active current component D2 and a reactive current component Q2 in a rotating coordinate system, and an alternating current quantity is converted into a direct current quantity to be processed to obtain an actual active current and an actual reactive current, wherein a formula for converting the alternating current quantity into the direct current quantity in step C is as follows:
wherein, IdIs the actual active current, IqIs the actual reactive current;
step D, taking Iref1 and Iref2 in the step B as given quantities and taking the difference with the actual active current obtained by calculation in the step C to control the active current through PID; c, after the Q1 given value and the Q2 given value are used as given quantities and are subjected to PID control after being subjected to difference with the actual reactive current sample obtained by calculation in the step C, the reactive current is controlled;
step E, generating modulated wave signals PwmDuty1 and PwmDuty2, comparing the modulated wave signals PwmDuty1 and PwmDuty2 with the triangular carrier, combining the wave-transmitting time sequence of the three-level half-bridge circuit, as shown in the working diagram of the PWM wave-transmitting time sequence of FIG. 4, and increasing the dead time at the same time to generate PWM signals Plus1 and Plus2 for controlling the power device; the generation of the modulated wave signals PwmDuty1 and PwmDuty2 in the step E is performed by performing inverse Park transform according to the output result in the step D and the phase information output in the step a, and the generation formula is as follows:
the method adopts a three-level topology of interconnection of an alternating current midpoint and a direct current midpoint, locks the phase of a power grid in real time on the basis of a software phase-locked loop with phase compensation and power factor setting, and adopts a current acquisition strategy combining automatic load power tracking and grid-connected power setting; orthogonal decomposition of inductive current is adopted, active current and reactive current control are taken into consideration, and requirements of different working conditions are met; and the superposed load current feedforward quickly responds to load change on the premise of ensuring phase following.
Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A control method of a two-phase three-wire inverter is characterized by comprising the following steps:
step A, sampling the voltage of a power grid to obtain the phase information of the current power grid; sampling voltage and current information in real time to calculate the current actual power factor, and calculating the phase offset according to the calculated actual power factor to be superposed and added into the phase information of the power grid; meanwhile, power factor setting is added, and phase offset is calculated according to the power factor set by a user and added into the phase information of the power grid in a superposed manner; synthesizing three input source information, outputting locked phase information Sin/Cos, and outputting another path of network voltage phase information NSin/NCos through phase conversion;
b, calculating load power in real time according to the sampled load voltage and load current, superposing user grid-connected set power to generate current required total power, and calculating required target current sizes Iref1 and Iref2 according to the current power grid voltage;
step C, sampling inductor currents IL1 and IL2, performing phase shift processing to complete Clark conversion, generating orthogonal current components α 1 and β 1, α 2 and β 2, then performing comprehensive calculation with the phase information output in the step 1, performing Park conversion to generate an active current component D1 and a reactive current component Q1, an active current component D2 and a reactive current component Q2 in a rotating coordinate system, and converting the alternating current into direct current to process to obtain actual active current and actual reactive current;
step D, taking Iref1 and Iref2 in the step B as given quantities and taking the difference with the actual active current obtained by calculation in the step C to control the active current through PID; c, after the Q1 given value and the Q2 given value are used as given quantities and are subjected to PID control after being subjected to difference with the actual reactive current sample obtained by calculation in the step C, the reactive current is controlled;
and step E, generating modulated wave signals PwmDuty1 and PwmDuty2, comparing the modulated wave signals PwmDuty1 and PwmDuty2 with a triangular carrier, combining the wave transmission time sequence of the three-level half-bridge circuit, increasing the dead time, and generating PWM signals Plus1 and Plus2 for controlling the power device.
2. The control method of the two-phase three-wire inverter according to claim 1, characterized in that: the steps arePhase shift amount in step A
Wherein η is the power factor.
3. The control method of the two-phase three-wire inverter according to claim 1, characterized in that: total power P in said step BGeneral assembly＝Pset+PloadWherein P issetIs the real-time power of the load, PloadAnd setting power for grid connection of a user.
4. The control method of the two-phase three-wire inverter according to claim 3, characterized in that: the formulas of the required target current magnitudes Iref1 and Iref2 in step B are:
wherein, Ugrid1And Ugrid2Are the current grid voltage.
5. The method according to claim 1, wherein the formula for converting the ac value into the dc value in step C is:
wherein, IdIs the actual active current, IqIs the actual reactive current.
6. The control method of the two-phase three-wire inverter according to claim 3, characterized in that: the generation of the modulated wave signals PwmDuty1 and PwmDuty2 in the step E is performed by performing inverse Park transform according to the output result in the step D and the phase information output in the step a, and the generation formula is as follows:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010116600.XA CN111327081B (en) | 2020-02-25 | 2020-02-25 | Control method of two-phase three-wire inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010116600.XA CN111327081B (en) | 2020-02-25 | 2020-02-25 | Control method of two-phase three-wire inverter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111327081A true CN111327081A (en) | 2020-06-23 |
| CN111327081B CN111327081B (en) | 2021-12-07 |
Family
ID=71171198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010116600.XA Active CN111327081B (en) | 2020-02-25 | 2020-02-25 | Control method of two-phase three-wire inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111327081B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05184156A (en) * | 1992-01-08 | 1993-07-23 | Mitsubishi Electric Corp | Controller for inverter unit |
| JPH10262398A (en) * | 1997-03-18 | 1998-09-29 | Mitsubishi Electric Corp | Controller for motor and its position correcting method |
| US20020051373A1 (en) * | 2000-10-26 | 2002-05-02 | Laszlo Lipcsei | DC-to-DC converter with improved transient response |
| CN105226978A (en) * | 2015-10-10 | 2016-01-06 | 阳光电源股份有限公司 | A kind of five-electrical level inverter and application circuit thereof |
| CN105391371A (en) * | 2015-12-28 | 2016-03-09 | 哈尔滨工业大学 | Two-phase three-level inversion driving circuit based on six power switch tubes |
| CN108199414A (en) * | 2018-01-29 | 2018-06-22 | 南方电网科学研究院有限责任公司 | Control method and device, computer equipment and the storage medium of micro-capacitance sensor |
| CN109412441A (en) * | 2018-10-08 | 2019-03-01 | 全球能源互联网研究院有限公司 | The MMC control method of T-type three-level topology based on reverse blocking IGBT |
| CN110474553A (en) * | 2018-05-11 | 2019-11-19 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | A kind of control system of current transformer parallel-connection structure |
| CN110601144A (en) * | 2019-10-12 | 2019-12-20 | 东莞市峰谷科技有限公司 | BMS current protection signal latch and reset circuit |
| CN110663163A (en) * | 2017-06-15 | 2020-01-07 | 雷诺股份公司 | Method for controlling a three-phase vienna rectifier |
-
2020
- 2020-02-25 CN CN202010116600.XA patent/CN111327081B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05184156A (en) * | 1992-01-08 | 1993-07-23 | Mitsubishi Electric Corp | Controller for inverter unit |
| JPH10262398A (en) * | 1997-03-18 | 1998-09-29 | Mitsubishi Electric Corp | Controller for motor and its position correcting method |
| US20020051373A1 (en) * | 2000-10-26 | 2002-05-02 | Laszlo Lipcsei | DC-to-DC converter with improved transient response |
| CN105226978A (en) * | 2015-10-10 | 2016-01-06 | 阳光电源股份有限公司 | A kind of five-electrical level inverter and application circuit thereof |
| CN105391371A (en) * | 2015-12-28 | 2016-03-09 | 哈尔滨工业大学 | Two-phase three-level inversion driving circuit based on six power switch tubes |
| CN110663163A (en) * | 2017-06-15 | 2020-01-07 | 雷诺股份公司 | Method for controlling a three-phase vienna rectifier |
| CN108199414A (en) * | 2018-01-29 | 2018-06-22 | 南方电网科学研究院有限责任公司 | Control method and device, computer equipment and the storage medium of micro-capacitance sensor |
| CN110474553A (en) * | 2018-05-11 | 2019-11-19 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | A kind of control system of current transformer parallel-connection structure |
| CN109412441A (en) * | 2018-10-08 | 2019-03-01 | 全球能源互联网研究院有限公司 | The MMC control method of T-type three-level topology based on reverse blocking IGBT |
| CN110601144A (en) * | 2019-10-12 | 2019-12-20 | 东莞市峰谷科技有限公司 | BMS current protection signal latch and reset circuit |
Non-Patent Citations (4)
| Title |
|---|
| B.N.SING等: "Interleaved 3-Phase PWM AC/DC Converters Based on a 4 Switch Topology", 《2000 IEEE 31ST ANNUAL POWER ELECTRONICS SPECIALISTS CONFERENCE》 * |
| 董钺等: "用于两相三线电网不对称负载的并网逆变器研究", 《电气传动》 * |
| 闫涛等: "新型中点钳位三电平电池储能变流器设计及控制系统", 《电力系统自动化》 * |
| 马伏军等: "一种简化型三电平高速铁路功率调节器", 《电力系统自动化》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111327081B (en) | 2021-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102611138B (en) | Delay-free single-phase photovoltaic synchronization power adjusting method | |
| CN102856916B (en) | Reactive power control method and circuit of single-phase photovoltaic inverter | |
| CN111371106B (en) | Phase-locked loop based three-phase four-leg inverter control system and control method | |
| CN110086196B (en) | Control method of single-phase cascade H-bridge grid-connected inverter under weak grid | |
| CN111416382B (en) | Control method of two-stage three-phase cascade photovoltaic grid-connected inverter | |
| CN109193794A (en) | A kind of Grid-connected Control Strategy of low-voltage direct micro-capacitance sensor | |
| Mansour et al. | Hardware-in-the-loop testing of seamless interactions of multi-purpose grid-tied PV inverter based on SFT-PLL control strategy | |
| Kwon et al. | Highly efficient single-stage DAB microinverter using a novel modulation strategy to minimize reactive power | |
| CN113839388A (en) | Current double-loop control method of active power filter based on hybrid load | |
| Mejía-Ruiz et al. | Grid-connected three-phase inverter system with LCL filter: Model, control and experimental results | |
| CN106849624B (en) | Method and system for eliminating three-phase rectification harmonic waves based on repetitive control | |
| CN108880316B (en) | Grid-connected converter prediction control system with voltage compensation and control method | |
| CN113612398B (en) | Nonlinear control method and system for high-frequency chain matrix converter under power grid distortion working condition | |
| CN111327081B (en) | Control method of two-phase three-wire inverter | |
| CN112564170B (en) | Power balance control method for cascaded H-bridge photovoltaic grid-connected inverter | |
| CN110098637B (en) | Dual-mode smooth switching control method for cascaded H-bridge photovoltaic grid-connected inverter | |
| Sunny et al. | SVPWM based decoupled control of active and reactive power for single stage grid connected solar PV system | |
| WO2024065986A1 (en) | Dual three-phase motor high-precision model prediction current control system and control method | |
| CN110311407B (en) | Double-mode seamless switching control method for cascade inverter based on voltage closed loop | |
| CN115360920A (en) | Positive and negative sequence maximum and minimum harmonic zero sequence voltage injection method of cascade converter | |
| CN113206504A (en) | Power supply network voltage comprehensive compensation control method based on chain type power electronic converter | |
| Zhou et al. | Proportional-resonant current control of single-phase grid-tied PV inverter system | |
| CN116780926B (en) | Inverter and inverter control method | |
| CN112564535B (en) | Control method of common direct current bus cascade H-bridge photovoltaic grid-connected inverter | |
| CN110492527B (en) | Hierarchical power control method under isolated island operation of cascaded H bridge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231024 Address after: Delaware Patentee after: Saivante Systems Address before: 523000 building C7, we Valley, Everbright, No.16, Keji 4th Road, Songshanhu high tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee before: Dongguan Fenggu Technology Co.,Ltd. |