CN111969873A - Control method of voltage source type off-grid inverter - Google Patents
Control method of voltage source type off-grid inverter Download PDFInfo
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- CN111969873A CN111969873A CN202010831336.8A CN202010831336A CN111969873A CN 111969873 A CN111969873 A CN 111969873A CN 202010831336 A CN202010831336 A CN 202010831336A CN 111969873 A CN111969873 A CN 111969873A
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- 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
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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Abstract
The invention discloses a control method of a voltage source type off-grid inverter, wherein the inverter comprises an output filter, the output filter comprises an inductor, and the method comprises the following steps: determining a forward peak reference current i of an inductorLp_ref *And negative peak reference current iLn_ref *(ii) a Wherein the output voltage of the inverter is referenced ug *And an output voltage value ugInputting a voltage control loop, wherein the output of the voltage control loop is negative peak reference current iLn_ref *(ii) a Forward peak reference current iLp_ref *＝2*io_ref‑Ineg(ii) a In the formula io_ref＝Io_amp*sinθ，Io_ampIs the peak value of output current I under rated power of the inverternegSetting an inductance negative current peak value under the rated power of the inverter, wherein sin theta is a sine value of an output voltage or current phase angle of the inverter; the set direction of the reference current in the positive half cycle and the set direction of the reference current in the negative half cycle of the inverter output current waveform areThe opposite is true. When the inverter runs under light load or no load, the power quality of the output inverter voltage can be effectively improved by adopting the alternating control of positive and negative currents for the output filter inductance current.
Description
Technical Field
The invention relates to a control method of a voltage source type off-grid inverter, relates to a power conversion technology in a power converter, and belongs to the technical field of power electronic equipment.
Background
At present, the application of an off-grid inverter in production and life is more and more extensive, the requirement of a load on the power supply quality of the off-grid inverter is higher and higher, the control precision is reduced due to smaller output current when a voltage source type off-grid inverter runs under light load or even no load, the output voltage waveform is easy to distort, and the power quality is poorer particularly near the zero crossing point of the output voltage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a control method of a voltage source type off-grid inverter, which can effectively improve the electric energy quality of output inversion voltage by adopting the alternating control of positive and negative currents for output filter inductance current during light load or no-load operation.
In order to solve the technical problems, the technical scheme of the invention is as follows: a control method of a voltage source type off-grid inverter comprises an output filter, the output filter comprises an inductor, and the method comprises the following steps:
determining a forward peak reference current i of an inductorLp_ref *And negative peak reference current iLn_ref *(ii) a Wherein,
referencing the output voltage of the inverter to ug *And an output voltage value ugInputting a voltage control loop, wherein the output of the voltage control loop is negative peak reference current iLn_ref *；
Forward peak reference current iLp_ref *＝2*io_ref-Ineg；
In the formula io_ref＝Io_amp*sinθ，Io_ampIs the peak value of output current I under rated power of the inverternegSetting an inductance negative current peak value under the rated power of the inverter, wherein sin theta is a sine value of an output voltage or current phase angle of the inverter;
the setting direction of the reference current in the positive half cycle and the setting direction of the reference current in the negative half cycle of the inverter output current waveform are opposite.
Further, a PR controller is adopted in the voltage control loop.
Further, the transfer function of the PR controller is as follows:
the transfer function of the PR controller is as follows:
in the formula,
kpis the proportional coefficient, k, of the PR controllerrIs the resonance coefficient of PR controller, w0For the fundamental angular frequency, w, of the PR controllercutFor the PR controller cutoff angular frequency, s is a complex frequency domain variable.
The inverter comprises an H-bridge power switch circuit, the H-bridge power switch circuit comprises four power switch devices, every two power switch devices form a bridge arm, the control logics of the power switch devices on the bridge arms are complementary, and the power switch devices on the same bridge arm are alternately switched on and off;
the method also comprises the following steps:
control logic of the H-bridge power switch circuit:
s10: conducting each power switch device on different bridge arms;
s20: sampling current i by the positive inductance peak value of the inductorLp_peakTracking the forward peak reference current iLp_ref *When i isLp_peak＝iLp_ref *Switching on and off the power switch device of the same bridge arm, and simultaneously enabling the negative inductance peak value to sample current iLn_peakTracking negative peak reference current iLn_ref *When i isLn_peak＝iLn_ref *Switching on and off the same arm at any timeA power switching device;
s30: step S20 is repeated.
After the technical scheme is adopted, the output voltage and the output reference voltage of the inverter are used as the input of the voltage control loop, the output of the voltage control loop is used as the reference input of the negative peak current (obtained by sampling) of the inductive current, and the reference input of the positive peak current (obtained by sampling) of the inductive current is obtained by calculating the rated output current under the full-load working condition, the set negative current and the like. Through alternating control of positive peak current and negative peak current of the output filter inductor, the quality of electric energy of output voltage of the inverter in the whole load range (0-100%) is high.
Drawings
Fig. 1 is a schematic diagram of a typical voltage source off-grid inverter of the present invention.
FIG. 2 is a control block diagram of the voltage source off-grid inverter of the present invention;
fig. 3(a) is a waveform diagram of a positive half cycle of an inductor current when the voltage source type off-grid inverter outputs full power;
fig. 3(b) is a waveform diagram of a negative half cycle of an inductor current when the voltage source type off-grid inverter outputs full power;
fig. 4(a) is a waveform diagram of a positive half cycle of an inductor current when a voltage source type off-grid inverter outputs in a wide power range;
fig. 4(b) is a waveform diagram of the negative half cycle of the inductor current when the voltage source type off-grid inverter outputs in a wide power range.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
FIG. 1 illustrates a typical single-phase H-bridge voltage source inverter; the single-phase H-bridge voltage source inverter comprises an H-bridge topology formed by 4 power switching devices Q1, Q2, Q3 and Q4, a bridge arm formed by the power switching device Q1 and the power switching device Q2, another bridge arm formed by the power switching device Q3 and the power switching device Q4, and power switches on the bridge armsThe control logics of the devices are complementary, the power switch devices of the same bridge arm are alternately switched on and off, the output filter consists of an inductor L and a capacitor C, and the direct current input power supply is udcThe inverter output voltage is ugThe inductor current is iLFilter capacitor current of iCThe inverter output current is io。
In FIG. 2, ug *For the inverter output reference voltage ugFor the inverter output voltage value, iLp_ref *、iLn_ref *Positive peak reference current and negative peak reference current, i, of the inductor current, respectivelyLp_peak、iLn_peakRespectively positive peak current (namely positive peak sampling current) and negative peak current (namely negative peak sampling current) of the sampled inductor current.
In fig. 3(a) and 3(b), the reference direction for setting the inductor current in the positive half-cycle coincides with the inductor current direction in fig. 1, and the reference direction for setting the inductor current in the negative half-cycle is opposite to the inductor current direction in fig. 1.
In fig. 4(a) and 4(b), the reference direction of the set inductor current in the positive half-cycle coincides with the inductor current direction in fig. 1, and the reference direction of the set inductor current in the negative half-cycle is opposite to the inductor current direction in fig. 1.
Firstly, the specific steps of the control method are explained by taking the positive half cycle of the waveform of the output current of the inverter as an example:
1) determining a forward peak reference current i of an inductorLp_ref *。
In order to ensure that the output power runs in the no-load to full-load interval, the positive peak reference current i of the inductive current is determined by the rated powerLp_ref *The inductance waveform is shown in fig. 3 (a). For the bridge type voltage source inverter, C is a filter capacitor, and the capacitance value is generally small, so that the capacitance reactance of the bridge type voltage source inverter is far greater than the load impedance. So that it can be considered that the inductor current i flows during one switching period TLIs approximately equal to the output current value io. The inductance forward peak reference current is obtained by the following formula:
iLp_ref *＝2*io_ref-Ineg (1)
in the formula io_ref＝Io_amp*sinθ，Io_ampIs the peak value of output current I under rated power of the inverternegSetting inductance negative current peak value (I) for inverter rated powernegBoth the magnitude of the forward peak current and the switching period T of the inverter), sin θ being the sine of the inverter output voltage or current phase angle.
2) Determining a negative peak reference current i of an inductor currentLn_ref *。
Negative peak reference current iLn_ref *The inductor current waveform is shown in fig. 4 (a). Negative peak reference current iLn_ref *Derived from the output of the voltage control loop in the control block diagram shown in figure 3.
3) The on-off logic of the power switch device is determined.
Taking the single-phase H-bridge voltage source inverter shown in fig. 1 as an example, the on-off logic of the power switching device in the positive half period is explained:
a) first of all, the power switch device Q2、Q3Conducting, DC voltage source udcCharging the filter inductor L, increasing the inductor current in the positive direction, and when the inductor current is in the positive peak value iLp_peakReach the forward peak reference current iLp_ref *Time, power switch device Q2Keep on, power switch device Q3Turning off;
b) power switch device Q3After turn-off, the power switch device Q4And conducting complementarily. Inverter output voltage ugThe filter inductor L is reversely charged, the inductor current increases in a negative direction, and when the inductor negative peak current iLn_peakReach the forward peak reference current iLn_ref *Time, power switch device Q2Keep on, power switch device Q4Turning off;
c) power switch device Q4After turn-off, the power switch device Q3And conducting complementarily. Repeating the above steps a) and b).
The negative half cycle of the output current waveform of the inverter is similar to the positive half cycle, and the control method comprises the following specific steps during the negative half cycle:
for descriptive uniformity, the reference direction of inductor current in the negative half-cycle is set opposite to the positive half-cycle.
4) Determining a forward peak reference current i of an inductorLp_ref *。
Inductor current waveform As shown in FIG. 4(b), the peak reference current i is positiveLp_ref *As determined by equation (1), it is noted that the ratio of the direction of the inductor forward peak reference current to the positive half cycle is now reversed.
5) Determining a negative peak reference current i of an inductor currentLn_ref *。
Negative peak reference current iLn_ref *The inductor current waveform is shown in fig. 4 (b). Negative peak reference current iLn_ref *From the output of the voltage control loop in the control block diagram of fig. 3, it is noted that the ratio of the direction of the inductive negative peak reference current to the positive half cycle is also reversed.
6) The on-off logic of the power switch device is determined.
Taking the single-phase H-bridge voltage source inverter shown in fig. 1 as an example, the on-off logic of the power switching device in the positive half period is explained:
a) first of all, the power switch device Q1、Q4Conducting, DC voltage source udcCharging the filter inductor L, and increasing the positive half period of the inductor current when the positive peak current i of the inductor isLp_peakReach the forward peak reference current iLp_ref *Time, power switch device Q1Keep on, power switch device Q4Turning off;
b) power switch device Q4After turn-off, the power switch device Q3And conducting complementarily. Inverter output voltage ugThe filter inductor L is reversely charged, the negative half period of the inductor current is increased in a negative direction, and when the negative peak current i of the inductor is increased in a negative directionLn_peakReaching a negative peak reference current iLn_ref *When the temperature of the water is higher than the set temperature,power switch device Q1Keep on, power switch device Q3Turning off;
c) power switch device Q3After turn-off, the power switch device Q4And conducting complementarily. Repeating the above steps a) and b).
In the embodiment, the output voltage of the inverter and the output reference voltage are used as the input of the voltage control loop, the output of the voltage control loop is used as the reference input of the negative peak current (obtained by sampling) of the inductive current, the reference input of the positive peak current (obtained by sampling) of the inductive current is obtained by calculating the rated output current under the full-load working condition, the set negative current and the like, and the THD of the output voltage of the inverter in the full-load range is smaller by adopting positive and negative current alternating control on the output filter inductive current.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Claims (4)
1. A control method of a voltage source type off-grid inverter, the inverter comprises an output filter, the output filter comprises an inductor, and the method is characterized by comprising the following steps:
determining a forward peak reference current i of an inductorLp_ref *And negative peak reference current iLn_ref *(ii) a Wherein,
referencing the output voltage of the inverter to ug *And an output voltage value ugInputting a voltage control loop, wherein the output of the voltage control loop is negative peak reference current iLn_ref *；
Forward peak reference current iLp_ref * ＝2*io_ref-Ineg；
In the formula io_ref＝Io_amp*sinθ，Io_ampIs the peak value of output current I under rated power of the inverternegSetting an inductance negative current peak value under the rated power of the inverter, wherein sin theta is a sine value of an output voltage or current phase angle of the inverter;
the setting direction of the reference current in the positive half cycle and the setting direction of the reference current in the negative half cycle of the inverter output current waveform are opposite.
2. The control method according to claim 1,
and a PR controller is adopted in the voltage control loop.
3. The control method according to claim 2,
the transfer function of the PR controller is as follows:
in the formula,
kpis the proportional coefficient, k, of the PR controllerrIs the resonance coefficient of PR controller, w0For the fundamental angular frequency, w, of the PR controllercutThe PR controller is cut to angular frequency, and s is a complex frequency domain variable;
referencing the output voltage of the inverter to ug *And an output voltage value ugThe difference of (a) is input to the voltage control loop.
4. The control method according to claim 1,
the inverter comprises an H-bridge power switch circuit, the H-bridge power switch circuit comprises four power switch devices, every two power switch devices form a bridge arm, the control logics of the power switch devices on the bridge arms are complementary, and the power switch devices of the same bridge arm are alternately switched on and off;
the method also comprises the following steps:
control logic of the H-bridge power switch circuit:
s10: conducting each power switch device on different bridge arms;
s20: sampling current i by the positive inductance peak value of the inductorLp_peakTracking the forward peak reference current iLp_ref *When i isLp_peak＝iLp_ref *Switching on and off the power switch device of the same bridge arm, and simultaneously enabling the negative inductance peak value to sample current iLn_peakTracking negative peak reference current iLn_ref *When i isLn_peak＝iLn_ref *Switching on and off the power switch devices of the same bridge arm;
s30: step S20 is repeated.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956768A (en) * | 2014-04-01 | 2014-07-30 | 燕山大学 | Control method for fault ride-through of photovoltaic grid-connected inverter |
| CN105870965A (en) * | 2016-04-20 | 2016-08-17 | 国家电网公司 | Grid-connected inverter control method under unbalanced power grid voltage condition |
| CN205693557U (en) * | 2016-05-10 | 2016-11-16 | 深圳市金威源科技股份有限公司 | A kind of single-phase off-network Inverter Over-current-limiting Methods circuit |
| CN106208670A (en) * | 2016-09-23 | 2016-12-07 | 江苏由甲申田新能源科技有限公司 | A kind of Bridgeless power factor correction soft switch circuit and control method thereof |
-
2020
- 2020-08-18 CN CN202010831336.8A patent/CN111969873B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956768A (en) * | 2014-04-01 | 2014-07-30 | 燕山大学 | Control method for fault ride-through of photovoltaic grid-connected inverter |
| CN105870965A (en) * | 2016-04-20 | 2016-08-17 | 国家电网公司 | Grid-connected inverter control method under unbalanced power grid voltage condition |
| CN205693557U (en) * | 2016-05-10 | 2016-11-16 | 深圳市金威源科技股份有限公司 | A kind of single-phase off-network Inverter Over-current-limiting Methods circuit |
| CN106208670A (en) * | 2016-09-23 | 2016-12-07 | 江苏由甲申田新能源科技有限公司 | A kind of Bridgeless power factor correction soft switch circuit and control method thereof |
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Address after: 213300 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee after: Changzhou Shiwei Electronics Co.,Ltd. Patentee after: Jiangsu Youjia Shentian New Energy Technology Co., Ltd Address before: 213300 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee before: CHANGZHOU SOARWHALE ELECTRONIC TECHNOLOGY Co.,Ltd. Patentee before: Jiangsu Youjia Shentian New Energy Technology Co., Ltd |