scholarly journals Neutral-Point Potential Balance Control Strategy on Three-Level Active Power Filters

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Fei Li ◽  
Na Geng ◽  
Guifeng Wang ◽  
Chunjie Li ◽  
Zhan Liu ◽  
...  
Keyword(s):  
Control Strategy ◽  
Pulse Width Modulation ◽  
Balance Control ◽  
Sampling Period ◽  
Active Power ◽  
Neutral Point ◽  
Active Power Filters ◽  
Power Filters ◽  
Occurrence Mechanism ◽  
Balancing Control

This paper presents a simplified strategy in neutral-point (NP) potential balance of the neutral-point-clamped (NPC) three-level three-wire active power filter (APF). By introducing a simplified carrier-based pulse width modulation (CB-PWM) strategy and analysing the occurrence mechanism of NP potential unbalance, we proposed a NP potential balancing control strategy based on the simplified strategy. With this strategy, the NP current in a sampling period can be calculated through the detection of compensating current of APF. The three phase’s duration time of reference voltage can also be computed through detecting the voltage fluctuation of upper and lower capacitors accurately, according to the law of charge conservation. Experiment results show that this proposed approach with simplified computation can effectively achieve NP potential balance.

Power Quality Improvement of High Voltage DC Link using Modified Shunt Active Power Filter

2018 ◽  
Vol 1 (1) ◽  
pp. 54-66
Author(s):  
Rakan Khalil Antar ◽  
Basil Mohammed Saied ◽  
Rafid Ahmed Khalil
Keyword(s):  
Power Quality ◽  
High Voltage ◽  
Pulse Width Modulation ◽  
Active Power Filter ◽  
Active Power ◽  
Voltage Source ◽  
Active Power Filters ◽  
Power Filter ◽  
Power Filters ◽  
Power Quality Improvement

A new control strategy for active power filters is proposed, modeled and implemented in order to improve the power quality of a line commutated converter High voltage DC link. The ability of reactive power and harmonics reductions are generally met by using passive and active power filters. In this paper, modified active power filter with a modified harmonics pulse width modulation algorithm is used to minimize the source harmonics and force the AC supply current to be in the same phase with AC voltage source at both sending and receiving sides of a line commutated converter high voltage DC link. Therefore, it is considered as power factor corrector and harmonics eliminator with random variations in the load current. The modified harmonics pulse width modulation algorithm is applicable for active power filter based on a three-phase five-level and seven-level cascaded H-bridge voltage source inverter. Simulation results show that the suggested modified multilevel active power filters improve total harmonics distortion of both voltage and current with almost unity effective power factor at both AC sides of high voltage DC link. Therefore, modified active power filter is an effective tool for power quality improvement and preferable for line commutated converter high voltage DC link at different load conditions.

A Control Method for Active Power Filters with Three-Level NPC Inverter

2011 ◽  
Vol 268-270 ◽  
pp. 428-433
Author(s):  
Chen Guo ◽  
Cun Bing Gui ◽  
Zhong Ren Chen
Keyword(s):  
Control Algorithm ◽  
Control Method ◽  
Sampling Period ◽  
Active Power ◽  
Pi Control ◽  
State Variables ◽  
Active Power Filters ◽  
Power Filters ◽  
Repetitive Nature ◽  
Periodic Error

This paper researches control problem for active power filters with three-level NPC inverter and proposes a novel PI control algorithm for tracking harmonic command current. This novel PI control algorithm can suppress the periodic error in the whole system to achieve zero steady error tracking. In this scheme, the state variables are estimated with a state observer to cancel the delay of one sampling period in this digital control system. Harmonic current is predicted with a repetitive algorithm simultaneity, which makes use of the repetitive nature of load current. The controller is analyzed and designed in the paper, and the experiment results illustrate that this APF can be controlled in a satisfactory way.

A control strategy for the stable operation of shunt active power filters in power grids

Energy ◽  
2016 ◽  
Vol 96 ◽  
pp. 325-334 ◽  
Author(s):  
Majid Mehrasa ◽  
Edris Pouresmaeil ◽  
Sasan Zabihi ◽  
Eduardo M.G. Rodrigues ◽  
João P.S. Catalão
Keyword(s):  
Control Strategy ◽  
Active Power ◽  
Power Grids ◽  
Stable Operation ◽  
Active Power Filters ◽  
Power Filters

scholarly journals Reducing neutral-point voltage fluctuation in NPC three-level active power filters

2017 ◽  
Vol 100 (2) ◽  
pp. 721-732 ◽  
Author(s):  
Peng Qian ◽  
Xiandong Ma ◽  
Guohai Liu ◽  
Zhaoling Chen
Keyword(s):  
Active Power ◽  
Neutral Point ◽  
Voltage Fluctuation ◽  
Active Power Filters ◽  
Power Filters

scholarly journals A Control Strategy For Pwm Rectifiers And Shunt Active Power Filters

2011 ◽  
Vol 16 (4) ◽  
pp. 312-319
Author(s):  
Darlan Alexandria Fernandes ◽  
Sreeramulu Raghuram Naidu ◽  
Kalina Pereira Medeiros
Keyword(s):  
Control Strategy ◽  
Active Power ◽  
Active Power Filters ◽  
Power Filters ◽  
Pwm Rectifiers
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