CN112803806B - Output voltage compensation method and voltage compensation device of inverter - Google Patents
Output voltage compensation method and voltage compensation device of inverter Download PDFInfo
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- CN112803806B CN112803806B CN202110292335.5A CN202110292335A CN112803806B CN 112803806 B CN112803806 B CN 112803806B CN 202110292335 A CN202110292335 A CN 202110292335A CN 112803806 B CN112803806 B CN 112803806B
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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
Abstract
The invention is suitable for the technical field of voltage control of electronic equipment, and provides an output voltage compensation method and a voltage compensation device of an inverter, wherein the method comprises the following steps: acquiring the load capacity of the isolation transformer, and determining a voltage compensation value according to the load capacity; obtaining a compensated given reference value according to the voltage compensation value and the given reference value; and after the compensated given reference value passes through the given loop and the control loop, outputting a control signal to control the inverter to work so as to enable a load end of the isolation transformer to obtain a rated value. The voltage compensation value is added at the input end of the given ring to perform voltage compensation on voltage drops caused by different load quantities on the isolation transformer so as to meet the requirement of system output voltage stability.
Description
Technical Field
The invention belongs to the technical field of voltage control of electric and electronic equipment, and particularly relates to an output voltage compensation method and a voltage compensation device of an inverter.
Background
Due to the requirement of the market on the inverter, on the basis of a high-frequency UPS, the output end is connected with an isolation transformer. After the isolation transformer is added, the secondary side voltage of the isolation transformer is the output voltage of the actual UPS, and the output voltage needs to be ensured to be stable at 220V/50 Hz. However, the sampled voltage of the system is the primary voltage of the isolation transformer, and when the isolation transformer is loaded with a load, the voltage drop exists, and when the load capacity is different, the voltage drop is also different, so that the output voltage of the inverter has deviation.
Disclosure of Invention
In view of this, embodiments of the present invention provide an output voltage compensation method and a voltage compensation apparatus for an inverter, which aim to solve a problem in the prior art that an output voltage of an uninterruptible power supply has a deviation after an output terminal of the inverter is connected to an isolation transformer.
In order to achieve the above object, a first aspect of embodiments of the present invention provides an output voltage compensation method for an inverter, which is applied to an inverter, an inverting output terminal of the inverter being connected to a load through an isolation transformer, and includes a given loop and a control loop, the given loop outputting a given value to the control loop according to a given reference value, the control loop controlling the inverter to operate according to a control signal output by the given value, so that the inverting output terminal of the inverter obtains the rated value, and the output voltage compensation method for the inverter further includes:
acquiring the load capacity of the isolation transformer, and determining a voltage compensation value according to the load capacity;
obtaining a compensated given reference value according to the voltage compensation value and the given reference value;
and after the compensated given reference value passes through the given loop and the control loop, outputting a control signal to control the inverter to work so as to enable the load end of the isolation transformer to obtain a rated value.
As another embodiment of the present application, the obtaining a compensated given reference value according to the voltage compensation value and the given reference value includes:
and adding the given reference value to the voltage compensation value to obtain a compensated given reference value.
As another embodiment of the present application, the given value is determined by:
and converting the effective value of the given reference value or the compensated given reference value into an alternating current instantaneous value, and outputting the alternating current instantaneous value as the given value.
As another embodiment of the present application, after obtaining the compensated given reference value according to the voltage compensation value and the given reference value, the method further includes:
acquiring a virtual voltage value, wherein the virtual voltage value is related to the current of the inversion output end;
after the compensated given reference value passes through the given loop and the control loop, outputting a control signal to control the inverter to work so that a load end of the isolation transformer obtains a rated value, comprising:
obtaining the given value after the compensated given reference value passes through the given ring;
obtaining a compensated given value according to the given value and the virtual voltage value;
And after the compensated set value passes through the control loop, outputting a control signal to control the inverter to work so as to enable the load end of the isolation transformer to obtain a rated value.
As another embodiment of the present application, the obtaining a virtual voltage value includes:
acquiring an inductive current instantaneous value of a filter connected with the inversion output end in real time;
and calculating the product of a preset virtual impedance value and the instantaneous value of the inverter inductance current, and taking the product as the virtual voltage value.
As another embodiment of the present application, the obtaining a compensated given value according to the given value and the virtual voltage value includes:
and adding the virtual voltage value to the given value to obtain a compensated given value.
As another embodiment of the present application, determining a voltage compensation value according to the amount of the charged particles includes:
and multiplying the load quantity by a preset proportional value to obtain the voltage compensation value.
A second aspect of an embodiment of the present invention provides a voltage compensation apparatus, which is applied to an inverter, an inverting output terminal of the inverter is used for being connected to a load through an isolation transformer, the voltage compensation apparatus includes a given loop and a control loop, the given loop outputs a given value to the control loop according to a given reference value, the control loop outputs a control signal according to the given value to control the inverter to operate, so that the inverting output terminal of the inverter obtains the rated value, and the voltage compensation apparatus performs voltage compensation by using the output voltage compensation method of the inverter according to any one of the embodiments.
A third aspect of the embodiments of the present invention provides an uninterruptible power supply with an isolation transformer, where the uninterruptible power supply includes an inverter, and an inverter output end of the inverter is used to connect to a load through the isolation transformer, and the uninterruptible power supply with the isolation transformer further includes the voltage compensation device in the above embodiments.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: compared with the prior art, the voltage compensation value is added at the input end of the given ring to perform voltage compensation on voltage drops caused by different load carrying quantities on the isolation transformer, so that the requirement of system output voltage stability is met.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram illustrating an implementation flow of an output voltage compensation method of an uninterruptible power supply according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a loop control system provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a linear relationship between a load amount and an inverter voltage compensation value according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a loop control system according to another embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 1 is a schematic flow chart of an implementation of an output voltage compensation method of an inverter according to an embodiment of the present invention, in this embodiment, as shown in fig. 2, the output voltage compensation method of the inverter is applied to the inverter, an inverting output terminal of the inverter is used for being connected to a load through an isolation transformer, a loop control system may include a given loop and a control loop, the given loop outputs a given value to the control loop according to a given reference value, and the control loop outputs a control signal according to the given value to control the inverter to operate, so that the inverting output terminal of the inverter obtains a rated value. When the loads are different, the voltage drops of the isolation transformers are different, so that the output voltage of the inverter can be controlled by adopting the output voltage compensation method of the inverter described in the embodiment, the requirement of output voltage stability is met, and the system is stable and reliable.
Because the output end of the inverter is connected with the isolation transformer, the actual output voltage of the inverter is the secondary voltage of the transformer, the voltage feedback quantity is the primary voltage sampling of the transformer, the isolation transformer has voltage drop, and the voltage drop is different when the load connected with the isolation transformer is different, so the loop control needs to compensate the output voltage. As can be seen from the transformer characteristics, the larger the load current is, the larger the voltage drop across the transformer is, so in this embodiment, the output voltage needs to be compensated according to the load capacity of the isolation transformer.
Optionally, the carrying capacity of the isolation transformer and the voltage compensation value may be in a linear relationship, and the voltage compensation value is linearly changed along with the carrying capacity, as shown in fig. 3, the voltage compensation value is larger and larger as the carrying capacity increases. Therefore, when determining the voltage compensation value, the tape load may be multiplied by a preset proportional value to obtain the voltage compensation value. It should be noted that the preset ratio value may be obtained through an experiment, and a value of the preset ratio value is not limited in this embodiment.
And 102, obtaining a compensated given reference value according to the voltage compensation value and the given reference value.
Referring to fig. 2, after determining the voltage compensation value, the given reference value is added to the voltage compensation value to obtain a compensated given reference value, that is, an input value of a given loop.
Optionally, in order to obtain a given value meeting the actual requirement, a given reference value may also be processed. The method can comprise the following steps: and converting the given reference value or the compensated given reference value from an effective value to an alternating current instantaneous value, and outputting the alternating current instantaneous value as the given value output by the given ring.
The conversion from the effective value to the AC instantaneous value is carried out, and the given reference value or the compensated given reference value is multiplied by the preset value to obtain the effective given value. In this embodiment, the value of the preset value may be 1.414. And then, converting the alternating current instantaneous value of the effective given value, namely multiplying the effective given value by sin theta, wherein the value of theta can be set according to actual requirements, and the value of theta is not limited in the embodiment.
Optionally, before the given ring, a parallel operation current sharing ring may be further included, and the output value of the parallel operation current sharing ring is added to the original given reference value. When there is no parallel operation system, the output value of the parallel operation current-sharing loop is zero.
In this step, after adding the voltage compensation value, it is actually measured that the loop control system shown in fig. 2 can satisfy the index requirement of output of 220V/50Hz at different carrying capacities of the isolation transformer. However, when a loop control system is tested, it is found that the dynamic index of the effective value of the output voltage of a single-machine system under the condition of sudden loading/sudden unloading resistance is 5.22%, and the dynamic index of the effective value of a parallel-machine system is 6.64%, which both exceed the requirement of < 5% of the specification requirement, so that the problem of dynamic standard exceeding is analyzed and processed.
Referring to fig. 2, when the loop control system is analyzed, the voltage compensation value is different when the load of the isolation transformer is different due to the voltage compensation value. But the load calculation process is performed in a 10ms task slice, the calculation process takes at least 10 ms. At the moment of sudden resistive full load of the loop control system, the load capacity is still kept to be zero, so that a voltage compensation value cannot be added in time, the input voltage of the compensated isolation transformer is low, the output voltage drop amplitude of the isolation transformer is large when the isolation transformer is suddenly added and fully loaded, and the dynamic index exceeds the standard when the isolation transformer is suddenly added and fully loaded. Similarly, when the full load is suddenly unloaded, the load capacity is kept at 100, so that the input voltage of the compensated isolation transformer is higher, the amplitude of the output voltage of the isolation transformer is increased greatly when the full load is suddenly unloaded, and finally the dynamic index exceeds the standard when the full load is suddenly unloaded. That is, since the load calculation at the moment of sudden loading/sudden unloading cannot be updated in time, the input voltage of the control loop of the loop control is low/high, and the dynamic index is deteriorated.
Therefore, after this step, it may further include: obtaining a virtual voltage value, wherein the virtual voltage value is related to the current of the inverter output end, and compensating the deviation of the control loop through the virtual voltage value added after the given loop as shown in fig. 4, so as to optimize the dynamic index when the load is fully loaded by sudden loading/sudden unloading.
Optionally, the virtual voltage value is determined by acquiring an instantaneous value of an inductive current of a filter connected to the inverter output terminal in real time;
and calculating the product of a preset virtual impedance value and the acquired inverter inductance current instantaneous value, and taking the product as the virtual voltage value.
And 103, outputting a control signal to control the inverter to work after the compensated given reference value passes through the given loop and the control loop so as to enable the load end of the isolation transformer to obtain a rated value.
Optionally, this step may include:
obtaining the given value after the compensated given reference value passes through the given ring;
obtaining a compensated given value according to the given value and the virtual voltage value;
and after the compensated set value passes through the control loop, outputting a control signal to control the inverter to work so as to enable the load end of the isolation transformer to obtain a rated value.
Optionally, referring to fig. 4, the obtaining of the compensated given value according to the given value and the virtual voltage value may include: and adding the virtual voltage value to the given value to obtain a compensated given value.
It should be noted that a given loop may include a repetitive control loop and may also include a dc component loop. In this embodiment, the voltage compensation value may be added to the input terminal of the repetitive control loop, and the voltage compensation value and the input voltage of the original repetitive control loop are input to the repetitive control loop together, and after the consumption of the repetitive control loop, the output voltage of the repetitive control loop is obtained, that is, the given value output by the given loop. When the isolation transformer further comprises a direct current component loop, the direct current component loop processes direct current to obtain an alternating current component, the output voltage, the alternating current component and the virtual voltage value of the repetitive control loop are jointly used as input voltage of the control loop, and a control signal can be output to control the inverter to work after passing through the control loop, so that a rated value is obtained at a load end of the isolation transformer.
And then, the dynamic index analysis of the output voltage of the inverter is carried out through sudden loading or sudden unloading.
Referring to fig. 4, when the load is suddenly applied and fully loaded, the input voltage of the given ring is lower due to the fact that the load cannot be updated in time, and the output voltage of the given ring is lower; at the moment, the inverter inductance current is suddenly added to the full load current value from 0, the product of the inverter inductance current instantaneous value and the preset virtual impedance value is added to the output of the given loop, and the deviation of the given loop can be supplemented back, so that the dynamic index when the inverter inductance current is suddenly added and the full load is optimized.
Referring to fig. 4, when the load is suddenly unloaded and fully loaded, the input voltage of the given ring is too high due to the fact that the load cannot be updated in time, and the voltage output value of the given ring is too high; but at the moment, the inverter inductance current is suddenly changed to 0 from the full-load current value, the product of the inverter inductance current instantaneous value and the preset virtual impedance value is added to the output of the given loop, and the deviation of the given loop can be compensated back, so that the dynamic index when the sudden unloading is full-load is optimized.
Similarly, when the load operates in a steady state with a resistive load, the voltage compensation value can be added normally, and at the moment, the product of the preset virtual impedance value and the instantaneous value of the inverter inductance current is calculated to be a smaller sine quantity, and the sine quantity at the position can be compensated back through the voltage compensation value.
Therefore, the dynamic index of the system output can be effectively optimized during sudden loading/sudden unloading full load and steady state operation, the system test is carried out after the virtual voltage value is added, and the dynamic index of the output voltage meets the requirement of less than 5 percent.
It should be noted that the value of the preset virtual impedance value is not too large, because when the system operates in a steady state with a resistive load, the dc bias introduced by the virtual impedance part can be compensated by the adjustment action of the given loop. However, when the load is a pure inductive or capacitive load, the phase of the instantaneous value of the inverter inductance current lags or leads the phase of the voltage, and the voltage multiplied by the preset virtual impedance value is a reactive voltage value. The reactive voltage cannot be compensated by the given loop, and for the control loop, the reactive voltage is equivalent to a disturbance, and when the value is larger, the system may be unstable, and a current oscillation phenomenon may be generated. Therefore, the value of the virtual impedance should not be too large.
The output voltage compensation method of the inverter carries out voltage compensation on voltage drops caused by different load carrying quantities on the isolation transformer by adding the voltage compensation value at the input end of the given ring so as to meet the requirement of system output voltage stability, and adds the virtual voltage value at the output end of the given ring so as to carry out timely compensation when the voltage compensation value cannot be timely compensated when the system is suddenly loaded or suddenly unloaded fully, so as to meet the requirement of system dynamic indexes.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by functions and internal logic of the process, and should not limit the implementation process of the embodiments of the present invention in any way.
Corresponding to the method for compensating the output voltage of the uninterruptible power supply in the above embodiments, this embodiment further provides a voltage compensation device, which is applied to an inverter, an inverting output terminal of the inverter is used to connect to a load through an isolation transformer, the voltage compensation device includes a given loop and a control loop, the given loop outputs a given value to the control loop according to a given reference value, the control loop outputs a control signal according to the given value to control the operation of the inverter, so that the inverting output terminal of the inverter obtains a rated value, the voltage compensation device performs voltage compensation by using the method for compensating the output voltage of the inverter in any of the above embodiments, and has the beneficial effects brought by the method for compensating the output voltage of the inverter in any of the above embodiments, that is, voltage compensation is performed by adding a voltage compensation value to an input terminal of the given loop to perform voltage compensation for voltage drops caused by different load quantities on the isolation transformer, the requirement of stable output voltage of the system is met, and the virtual voltage value is added at the output end of the given ring, so that the voltage compensation value cannot be compensated in time when the system is fully loaded or unloaded suddenly, and the requirement of the dynamic index of the system is met.
The present embodiment further provides an uninterruptible power supply with an isolation transformer, where the uninterruptible power supply includes an inverter, and an inverter output end of the inverter is used to connect to a load through the isolation transformer, and the uninterruptible power supply with the isolation transformer uses the voltage compensation device provided in the above embodiment, and has the beneficial effects brought by the voltage compensation device in the above embodiment, that is, by adding a voltage compensation value at an input end of a given ring, voltage compensation is performed on voltage drops caused by different load carrying amounts on the isolation transformer, so as to meet a requirement of stabilizing an output voltage of a system, and by adding a virtual voltage value at an output end of the given ring, so as to perform timely compensation when the voltage compensation value cannot be timely compensated when the system is suddenly loaded/unloaded, so as to meet a requirement of a dynamic index of the system.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (7)
1. An output voltage compensation method of an inverter, which is applied to the inverter, wherein an inverting output end of the inverter is used for being connected with a load through an isolation transformer, the method comprises a given loop and a control loop, the given loop outputs a given value to the control loop according to a given reference value, the control loop outputs a control signal according to the given value to control the inverter to work, so that the inverting output end of the inverter obtains the rated value, and the output voltage compensation method of the inverter is characterized by further comprising:
acquiring the load capacity of the isolation transformer, and determining a voltage compensation value according to the load capacity;
obtaining a compensated given reference value according to the voltage compensation value and the given reference value;
acquiring a virtual voltage value, wherein the virtual voltage value is related to the current of the inversion output end;
after the compensated given reference value passes through the given loop and the control loop, a control signal is output to control the inverter to work, so that a rated value is obtained at a load end of the isolation transformer; the method comprises the following steps: the given value is obtained after the compensated given reference value passes through the given ring; adding the virtual voltage value to the given value to obtain a compensated given value; and after the compensated set value passes through the control loop, outputting a control signal to control the inverter to work so as to enable the load end of the isolation transformer to obtain a rated value.
2. The method for compensating an output voltage of an inverter according to claim 1, wherein said deriving a compensated given reference value based on the voltage compensation value and the given reference value comprises:
and adding the given reference value to the voltage compensation value to obtain a compensated given reference value.
3. The output voltage compensation method of an inverter according to claim 1 or 2, wherein the given value is determined by:
and converting the effective value of the given reference value or the compensated given reference value into an alternating current instantaneous value, and outputting the alternating current instantaneous value as the given value.
4. The output voltage compensation method of an inverter according to claim 3, wherein the obtaining of the virtual voltage value includes:
acquiring an inductive current instantaneous value of a filter connected with the inversion output end in real time;
and calculating the product of a preset virtual impedance value and the instantaneous value of the inductive current, and taking the product as the virtual voltage value.
5. The output voltage compensation method of the inverter according to claim 1 or 2, wherein determining a voltage compensation value according to the amount of the charging includes:
and multiplying the load quantity by a preset proportional value to obtain the voltage compensation value.
6. A voltage compensation device applied to an inverter, an inverting output terminal of the inverter being used for connecting with a load through an isolation transformer, the voltage compensation device comprising a given loop and a control loop, the given loop outputting a given value to the control loop according to a given reference value, the control loop outputting a control signal according to the given value to control the operation of the inverter so that the inverting output terminal of the inverter obtains the rated value, wherein the voltage compensation device performs voltage compensation by using the output voltage compensation method of the inverter according to any one of claims 1 to 5.
7. An uninterruptible power supply with an isolation transformer, the uninterruptible power supply comprising an inverter, and an inverting output terminal of the inverter being connected to a load through the isolation transformer, wherein the uninterruptible power supply with the isolation transformer further comprises the voltage compensation device of claim 6.
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| CN101980096B (en) * | 2010-10-13 | 2012-09-05 | 北京星网锐捷网络技术有限公司 | Power supply compensation method and power supply compensation circuit |
| CN105680714A (en) * | 2014-11-19 | 2016-06-15 | 国家电网公司 | Control method and device for output voltage of inverter |
| CN109936169A (en) * | 2017-12-15 | 2019-06-25 | 台达电子企业管理（上海）有限公司 | Uneven and harmonic power distribution control method and device between shunt chopper |
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| CN102891615A (en) * | 2012-10-26 | 2013-01-23 | 河南师范大学 | Stable PWM (Pulse-Width Modulation) rectifier output power dead beat control method under unbalanced voltage |
| KR20160141940A (en) * | 2015-06-01 | 2016-12-12 | 엘에스산전 주식회사 | Apparatus for controlling interior permanent magnet synchronous motor |
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