A Control Method of Shunt Active Power Filter with Compensation Target
A technology of power filter and parallel connection, which is applied in the direction of active power filter and AC network to reduce harmonics/ripples, etc. It can solve the deterioration of nonlinear complexity of the power system, the deterioration of the grid voltage at the access point, and the equivalent characteristics of the port non-linear issues
Active Publication Date: 2022-03-18
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology
However, in fact, when the voltage at the access point of the nonlinear load has harmonic distortion, the load current of each phase is still controlled to a current waveform with sinusoidal characteristics. In this case, the port of the load connected to the grid is equivalent to The characteristic is non-linear
The port effect of this compensated nonlinear characteristic has already shown the negative effect of deteriorating the grid voltage at the access point. At the same time, this nonlinear equivalent load control mode obviously further deteriorates the nonlinear complexity of the power system.
So far, there are no literature reports and practical applications on the control method of shunt active power filters with compensation objectives
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[0018] Such as figure 1 As shown in FIG. 1 , a schematic diagram of a topology structure of a three-phase parallel active power filter connected in parallel to compensate a nonlinear load according to an embodiment of the present invention. Among them, u a , u b , u c is the instantaneous value of the three-phase phase voltage of the power supply; u pcc.a , u pcc.b , u pcc.c and i sa i sb i sc are the three-phase grid voltage and grid-side three-phase current detection values at the access point of the parallel active power filter; i La i Lb i Lc is the three-phase nonlinear load current detection value; i APF.a i APF.b i APF.c is the detected value of the three-phase current injected into the grid by the active power filter; u dc is the detection value of the DC side voltage of the active power filter; L s and R s are the equivalent internal inductance and equivalent internal resistance of the supply voltage source; L f is the filter inductance of the activ...
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The invention discloses a parallel active power filter control method with a compensation target, which is characterized in that it includes: dynamic extraction of instantaneous reference current signal and its current control inner loop and DC voltage control outer loop. Its function is to apply to the active power filter connected in parallel with the nonlinear load to be compensated, so that the port characteristic of the nonlinear load connected to the power grid is equivalent to a linear resistance. The invention can reasonably compensate the nonlinear characteristics of the nonlinear load in the power system, solve the problem of harmonic voltage distortion at the access point of the nonlinear load due to the control method of the traditional parallel active power filter, and simplify the The nonlinear complexity of the power system.
Description
technical field [0001] The invention relates to the field of three-phase active power filter control, and is a parallel active power filter control method with a compensation target, which is applied to the parallel compensation of the active power filter to make the nonlinear load connected to the grid port equivalent is the control of the linear resistance characteristic. Background technique [0002] With the development of power electronics technology and the continuous improvement of the requirements for high-efficiency and high-performance operation control of power systems, fully-controlled power electronic switching devices are increasingly used in power systems. Due to the nature of nonlinear characteristics of power electronic devices, the accompanying harmonic distortion of power system voltage and current has become more and more serious, and it has also increased the complexity of power system design and analysis. [0003] In view of the influence of harmonic v...
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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 金国彬李玲杨明城苑忠奇李国庆王振浩
Owner NORTHEAST DIANLI UNIVERSITY