CN111130125A - A reactive power compensation method for a converter and a control method for the converter - Google Patents
A reactive power compensation method for a converter and a control method for the converter Download PDFInfo
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- CN111130125A CN111130125A CN202010041546.7A CN202010041546A CN111130125A CN 111130125 A CN111130125 A CN 111130125A CN 202010041546 A CN202010041546 A CN 202010041546A CN 111130125 A CN111130125 A CN 111130125A
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- 238000004364 calculation method Methods 0.000 claims description 4
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- 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
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- 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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Abstract
The invention discloses a reactive power compensation method of a converter and a control method of the converter, and belongs to the field of power electronics. The reactive compensation method of the converter comprises the following steps: s1, acquiring instantaneous reactive power Q; s2, setting the reactive power Q*Inputting the difference with the instantaneous reactive power Q into a PI controller, and subtracting the output of the PI controller from the instantaneous reactive power Q to obtain a corrected reactive power, wherein the reactive power Q is set*Is 0. The control method of the converter comprises the steps of obtaining the corrected reactive power and replacing the corrected reactive power with the instantaneous reactive power to control the converter. The invention can realize reactive compensation, thereby reducing the deviation of the system reactive power caused by the inductance mismatch in the predictive power control algorithm of the converter.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a reactive power compensation method of a converter and a control method of the converter.
Background
In the predictive power control algorithm of the AC/DC or DC/AC converter, the prediction calculation of the active power and the reactive power of the next control period needs to depend on a circuit parameter model, particularly a network side inductance parameter L. The network side inductance L is the sum of the parasitic inductance at the ac side of the converter and the network side inductance, and in actual engineering, due to different measurement modes or aging of the inductance and other reasons, an error may occur in the measured inductance, which further causes the mismatch between the actual inductance parameter and the control inductance parameter. The requirement of prediction control on the accuracy of circuit parameters is high, but the predicted power of the network side is influenced when the inductance is mismatched, so that the deviation of the reactive power of the system is large.
Disclosure of Invention
In view of the above-mentioned deficiencies in the prior art, the present invention aims to provide a reactive power compensation method for a converter and a control method for a converter, which can implement reactive power compensation, thereby reducing the deviation of system reactive power caused by inductance mismatch in a predictive power control algorithm for a converter.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
a reactive power compensation method of a converter is provided, which comprises the following steps:
s1, acquiring instantaneous reactive power Q;
s2, setting the reactive power Q*Inputting the difference with the instantaneous reactive power Q into a PI controller, and subtracting the output of the PI controller from the instantaneous reactive power Q to obtain a corrected reactive power, wherein the reactive power Q is set*Is 0.
Further, the method for acquiring the proportional coefficient and the integral coefficient of the PI controller comprises the following steps:
setting the integral coefficient to be 0, gradually enlarging the proportional coefficient in a set range, and obtaining instantaneous reactive power Q after changing the proportional coefficient each time until the instantaneous reactive power Q is less than or equal to a set value and the latest proportional coefficient is equal to the proportional coefficient of the PI controller;
and determining an integral coefficient of the PI controller based on the latest proportional coefficient.
Further, the range is set to (0, 1).
Further, the calculation expression of the integral coefficient of the PI controller is as follows:
wherein k ispIs the latest proportionality coefficient, kpAs an integral coefficient, TsIs a switching cycle.
On the other hand, the control method of the converter comprises the steps of obtaining the corrected reactive power provided by the scheme, and replacing the corrected reactive power with the instantaneous reactive power to control the converter.
The invention has the beneficial effects that:
by adopting the reactive compensation method of the converter, the reactive compensation can be realized. And the deviation of system reactive power generation caused by inductance mismatch in a predictive power control algorithm of the converter can be reduced by applying the method to the control method of the converter.
Meanwhile, the invention is not only suitable for the AC/DC converter but also suitable for the DC/AC converter, thereby having stronger universality.
Drawings
FIG. 1 is a schematic diagram of a reactive compensation method of a converter according to the present invention;
FIG. 2 is a graph of reactive power waveforms before uncompensation;
FIG. 3 is a graph of a compensated reactive power waveform;
fig. 4 is a schematic diagram of a control method of a converter in an embodiment.
Detailed Description
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings to facilitate the understanding of the present invention by those skilled in the art. It should be understood that the embodiments described below are only some embodiments of the invention, and not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step, without departing from the spirit and scope of the present invention as defined and defined by the appended claims, fall within the scope of protection of the present invention.
As shown in fig. 1, the reactive power compensation method of the converter includes:
s1, acquiring instantaneous reactive power Q;
s2, setting the reactive power Q*Inputting the difference with the instantaneous reactive power Q into a PI controller, and subtracting the output of the PI controller from the instantaneous reactive power Q to obtain a corrected reactive power, wherein the reactive power Q is set*Is 0.
The method can realize reactive compensation, as shown in fig. 2 and 3, when the inductance mismatch rate delta is-90%, the instantaneous reactive power Q is closer to the set power Q*。
In implementation, the method for acquiring the proportional coefficient and the integral coefficient of the preferred PI controller in the scheme includes:
setting the integral coefficient to 0, gradually enlarging the proportional coefficient in a set range, and obtaining instantaneous reactive power Q after changing the proportional coefficient each time until the instantaneous reactive power Q is less than or equal to a set value, wherein the latest proportional coefficient is equal to the proportional coefficient of the PI controller. The range is generally set to (0,1), and the set value is generally close to 0 +.
And determining an integral coefficient of the PI controller based on the latest proportional coefficient. Specifically, the calculation expression of the integral coefficient of the PI controller is as follows:
wherein k ispIs the latest proportionality coefficient, kpAs an integral coefficient, TsIs a switching cycle.
On the other hand, the scheme also provides a control method of the converter, which comprises the steps of obtaining the corrected reactive power provided by the scheme, and replacing the corrected reactive power with the instantaneous reactive power to control the converter.
As shown in fig. 4, in an embodiment, the instantaneous active power P and the instantaneous reactive power Q are calculated by collecting the voltage, the current and the voltage phase of the network side, and the given value P of the active power is obtained by using the voltage outer loop*Using a set reactive power Q*And instantaneous reactive power Q, obtaining corrected reactive power Q'. And P, Q' and P*、Q*Substituting into model predictive control algorithm to obtain dModulated wave u in q-axisabd、uabq。
Claims (5)
1. A reactive compensation method for a converter is characterized by comprising the following steps:
s1, acquiring instantaneous reactive power Q;
s2, setting the reactive power Q*Inputting the difference with the instantaneous reactive power Q into a PI controller, and subtracting the output of the PI controller from the instantaneous reactive power Q to obtain a corrected reactive power, wherein the reactive power Q is set*Is 0.
2. The reactive compensation method of the converter according to claim 1, wherein the obtaining method of the proportional coefficient and the integral coefficient of the PI controller comprises:
setting the integral coefficient to be 0, gradually enlarging the proportional coefficient in a set range, and obtaining instantaneous reactive power Q after changing the proportional coefficient each time until the instantaneous reactive power Q is less than or equal to a set value and the latest proportional coefficient is equal to the proportional coefficient of the PI controller;
and determining an integral coefficient of the PI controller based on the latest proportional coefficient.
3. The reactive power compensation method of a converter according to claim 2, wherein the set range is (0, 1).
4. The reactive power compensation method of the converter according to claim 2 or 3, wherein the calculation expression of the integral coefficient of the PI controller is as follows:
wherein k ispIs the latest proportionality coefficient, kpAs an integral coefficient, TsIs a switching cycle.
5. A method of controlling a converter, comprising obtaining a modified reactive power according to any one of claims 1 to 4, and controlling the converter by replacing the modified reactive power with an instantaneous reactive power.
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| CN202010041546.7A CN111130125B (en) | 2020-01-15 | 2020-01-15 | A reactive power compensation method for a converter and a control method for the converter |
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| CN202010041546.7A CN111130125B (en) | 2020-01-15 | 2020-01-15 | A reactive power compensation method for a converter and a control method for the converter |
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| CN111130125B CN111130125B (en) | 2022-10-04 |
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2020
- 2020-01-15 CN CN202010041546.7A patent/CN111130125B/en not_active Expired - Fee Related
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