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A current double-loop control method for active power filter based on mixed load

A technology of power filter and mixed load, which is applied in the field of current double-loop control of active power filter based on mixed load, which can solve the problems of unfavorable protection of power devices, large number of current sensors, and lack of inductor current information, etc., and achieve excellent selection characteristics , good transient response performance, and the effect of enhancing stability

Active Publication Date: 2022-02-08
HUBEI UNIV OF TECH
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Problems solved by technology

In order to make the LCL type APF achieve the best harmonic compensation effect, the grid-side inductor current is usually used as the control variable, but this control method will also cause the loss of inverter-side inductor current information, which is not good for the protection of power devices. normal operation of the threat device
Moreover, the number of current sensors in this method is too large, and the reliability is relatively poor

Method used

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  • A current double-loop control method for active power filter based on mixed load
  • A current double-loop control method for active power filter based on mixed load
  • A current double-loop control method for active power filter based on mixed load

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Embodiment Construction

[0068] Below through embodiment, in conjunction with accompanying drawing, the technical scheme of the present invention is described further specifically

[0069] Step 1: From the perspective of compensation, the SAPF is equivalent to a harmonic current source, and the parallel compensation system before and after the active power filter is connected to the grid is modeled and analyzed, as shown in Figure 3a as shown, is the parallel APF output current, , , form a non-linear load.

[0070] Step 2: Since the voltage across the load capacitor is almost constant, the capacitor can be equivalent to a voltage source Series resistance , the inductance is equivalent to a current magnitude of A controlled current source in parallel with a resistor ,Such as Figure 3b shown, where , , The size of is related to the size of inductance, capacitance and resistance. The control coefficient of the controlled current source controlled by the voltage source is ,but =...

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Abstract

The invention relates to a current double-loop control method of an active power filter based on a mixed load. The control method is based on a mixed-load active power filter system current double-loop control system and an equivalent model of a harmonic amplification phenomenon established by the system. The method includes Compensation current outer loop control and damping inner loop control, harmonic current controller adopts proportional vector resonant controller, fundamental wave current controller adopts proportional resonant controller, DC voltage controller adopts proportional integral controller, damping inner loop adopts proportional Control mode, the invention can well compensate the harmonics of the harmonic amplification phenomenon caused by the hybrid nonlinear load, and at the same time suppress the resonance problem of the LCL filter, ensure the harmonic compensation effect of the APF, and enhance the stability of the system , and the harmonic compensation and DC side voltage regulation of the APF can be independently controlled.

Description

technical field [0001] The present invention relates to the field of power electronic control, in particular to a current double-loop control method for active power filters based on mixed loads, which is suitable for harmonic pollution problems caused by power grid current waveform distortion caused by nonlinear loads at power terminals. The current double-loop control strategy based on the improved proportional-vector (P-VR) resonant regulator is especially suitable for the mixed nonlinear load background. Background technique [0002] With the widespread use of power electronic converters, a large number of nonlinear loads such as rectifiers, grid-connected power supplies, and switching power supplies are connected to the grid, and the resulting harmonic pollution has brought many power quality problems. In order to solve these problems, parallel Type active power filter (shuntactivepowerfilter, SAPF) is an effective solution, so it is widely used. The LCL grid-connected...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18H02J3/24H02M7/5387
CPCH02J3/01H02J3/1842H02J3/241H02M7/53871H02J2203/20Y02E40/20
Inventor 蒋云昊胡睿伍科周高逸江雨昶徐岸非丁稳房席自强袁雷
Owner HUBEI UNIV OF TECH
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