Power quality compensation system and control method with bus voltage and current peak control
a power quality compensation and control method technology, applied in the direction of reducing harmonics/ripples in ac networks, electrical equipment, ac network circuit arrangements, etc., can solve the problems of power quality compensation system drawbacks, high instruction current from the voltage loop control unit, and damage to electronic devices connected to the power grid. to achieve the effect of reliable power quality
Active Publication Date: 2022-09-15
DELTA ELECTRONICS (SHANGHAI) CO LTD
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Benefits of technology
[0008]An object of the present disclosure provides a power quality compensation system and a control method with bus voltage and current peak control for providing reliable power quality while avoiding the frequent over-voltage protection measure or the frequent over-current protection measure.
Problems solved by technology
Further, the electronic devices connected to the power grid may be damaged.
However, the method of compensating the harmonic component and reactive component of the nonlinear load current by the conventional power quality compensation system still has some drawbacks.
In case that a real DC bus voltage from a conversion unit in the power quality compensation system deviates from the reference DC bus voltage, the instruction current from the voltage loop control unit is too high.
As a consequence, the ability of the power quality compensation system to control the DC bus voltage is weakened, and the over-voltage protection measure of the power quality compensation system is frequently done.
However, in some application scenarios, the output current of the conversion unit is readily greater than the preset current threshold value of the power quality compensation system because the peak value of the nonlinear load current is excessively high or the active power instruction of the bus voltage loop is too large.
The frequent over-current protection measure causes the power quality compensation system to shut down or breakdown, and seriously affects the reliability of the power quality compensation system.
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[0034]The present disclosure will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this disclosure are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.
[0035]FIG. 1 is a schematic circuit diagram illustrating the architecture of a power quality compensation system according to a first embodiment of the present disclosure. Preferably but not exclusively, the power quality compensation system 1 is an active power filter (APF), a static var generator (SVG), or an enhanced static var generator with a harmonic compensation function. As FIG. 1, the power quality compensation system 1 is electrically coupled with a power grid 2 and a nonlinear load 3. The power quality compensation system 1 comprises a first terminal 11 and a second terminal 12. The first terminal 11 of the power qua...
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A power quality compensation system has the functions of controlling the bus voltage and the current peak value. A first instruction current under control of a first peak current processing unit is lower than or equal to a first current threshold value. A second peak current processing unit outputs a second PWM driving signal according to a sampled current and a second current threshold value. A third peak current processing unit outputs a third PWM driving signal according to the sampled current and a third current threshold value. A conversion unit is operated according to the PWM driving signals. Moreover, the first current threshold value is adjusted in real time according to the comparing result of the sample current and the first current threshold value and the comparing result of the real DC bus voltage and the reference DC bus voltage.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to China Patent Application No. 202110275402.2, filed on Mar. 15, 2021, the entire contents of which are incorporated herein by reference for all purposes.FIELD OF THE INVENTION[0002]The present disclosure relates to a power quality compensation system and a control method with bus voltage and current peak control, and more particularly to a power quality compensation system and a control method for providing reliable power quality while avoiding the frequent over-voltage protection measure or the frequent over-current protection measure.BACKGROUND OF THE INVENTION[0003]Nowadays, the number of nonlinear loads connected to the power grid is gradually increased. The harmonic component and reactive component caused by nonlinear load would affect the power quality of the power grid current. Further, the electronic devices connected to the power grid may be damaged. Consequently, people pay more attention to the...
Claims
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IPC IPC(8): H02J3/18H02J3/20H02J3/01
CPCH02J3/1842H02J3/20H02J3/01H02J3/381H02J3/18H02J3/144
Inventor HUANG, HENGLIU, RANWU, SHUAI
Owner DELTA ELECTRONICS (SHANGHAI) CO LTD