An active power filter and unbalanced current compensator

Verdelho, P.; Marques, G.D.

doi:10.1109/41.585829

Cited by 160 publications

(43 citation statements)

References 7 publications

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“…The mean value of p C (t) in (5) becomes zero if the source currents are balanced, as in (3). Therefore, maintaining the DC capacitor voltage at a constant value in Fig.…”

Section: Proposed Control Algorithm For Albmentioning

confidence: 99%

Novel Control Algorithm for Active Load Balancer in Three-Phase Four-Wire Distribution Systems

et al. 2014

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Three-phase four-wire distribution systems are widely used in many countries. These distribution systems are used for both three-phase three-wire loads and single-phase two-wire consumer appliances, e.g., in South Korea and Myanmar. Because of the time-dependent load characteristics, unbalanced load conditions frequently occur, resulting in the unbalanced voltages for the three-phase and single-phase loads. In addition, these unbalanced load conditions cause more loss in the distribution transformer. This paper proposes a novel reference current generation method for active load balancer (ALB) in the three-phase four-wire distribution systems. The main advantages of the proposed method is that it uses only a constant DC capacitor voltage control for reference current generation without calculating the active and reactive currents in the three-phase four-wire distribution systems. The basic principle of the novel reference generation method in ALB is discussed and then confirmed on the basis of results of digital computer simulation using PSIM software.

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“…The mean value of p C (t) in (5) becomes zero if the source currents are balanced, as in (3). Therefore, maintaining the DC capacitor voltage at a constant value in Fig.…”

Section: Proposed Control Algorithm For Albmentioning

confidence: 99%

Novel Control Algorithm for Active Load Balancer in Three-Phase Four-Wire Distribution Systems

et al. 2014

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“…In the abc frame, the current loop is considered as a first-order inertia element (P regulator) and a second-order oscillation element (PI regulator). In [23], the bandwidth of a PAPF was usually selected as 1/5 of the switching frequency and it was easily realized [20,24]. This cut-off frequency is in common use and can be realized.…”

Section: Switching Frequency Analysis and Specificationmentioning

confidence: 99%

Analysis and Specifications of Switching Frequency in Parallel Active Power Filters Regarding Compensation Characteristics

Zhao¹,

Liu²

2010

Journal of Power Electronics

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The switching frequency of a power device is a very important parameter in the design of a parallel active power filter (PAPF), but so far, very little discussion has been conducted on it in a quantitative manner in previous publications. In this paper, an extensive analysis on the effects of the switching frequency on the performance of a PAPF is made, and a specification of the switching frequency values with different compensation results is presented. A first-order inertia element and a second-order oscillation element are considered as approximate models of a PAPF, respectively. The compensation characteristic for each order of harmonic current is obtained at different switching frequencies. Then, the THDs of each model for the system loads of a rectifier with resistance and inductance loads are proposed. The compensation results of a PAPF controlled as a first-order inertia element are better than those of a PAPF controlled as a second-order oscillation element. With two types of system loads which are rectifier with resistance and inductance loads and rectifier with resistance, inductance and capacitance loads, the THDs of the source current after compensation are presented with different switching frequencies. The compensation characteristics for the most widely used digital control system are investigated. The situation with an analog control is the theoretical characteristic and it is the best situation. The compensation characteristic of the digital control is worse than the compensation characteristic of the theoretical characteristic. Based on these analyses, the specifications of compensation characteristics with different switching frequencies are quite straightforward. Finally, a practical design example is studied to verify the application.

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“…Note that a positive quantity of P es means that an active power flows from the power system to the ES and vice versa. Equation (11) indicates that P es is a circular paraboloid function (as K 1 = K 3 ) of P s bal and Q s bal in three-dimensional P s bal -Q s bal -P es space. The three-phase power system in Fig.…”

Section: Building Supply Voltagementioning

confidence: 99%

“…Equations (15) to (17) are used for classifying the stationary point of the function P es in (11). The determinant D(P s bal , Q s bal ) of the Hessian matrix of the function P es ,…”

Section: Building Supply Voltagementioning

confidence: 99%

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A Comprehensive Analysis and Control Strategy for Nullifying Negative- and Zero-Sequence Currents in an Unbalanced Three-Phase Power System Using Electric Springs

Mok

Tan

et al. 2017

IEEE Trans. Power Electron.

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Abstract-This paper presents a general analysis and a control strategy that enables electric springs (ES) to mitigate the negative-sequence and zero-sequence currents in unbalanced three-phase power systems. The analysis indicates that under certain load conditions, power balance can be restored without the need for active power from the ES. Outside such conditions, the theory can pinpoint the precise operating point at which power balance can be achieved with the minimum active power from the ES. Thus, the optimum use of energy usage and battery size for providing/storing active power can be realized. Simulation and experiment results obtained from a 3-kW hardware setup have verified the new theory and the control method.

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An active power filter and unbalanced current compensator

Cited by 160 publications

References 7 publications

Novel Control Algorithm for Active Load Balancer in Three-Phase Four-Wire Distribution Systems

Novel Control Algorithm for Active Load Balancer in Three-Phase Four-Wire Distribution Systems

Analysis and Specifications of Switching Frequency in Parallel Active Power Filters Regarding Compensation Characteristics

A Comprehensive Analysis and Control Strategy for Nullifying Negative- and Zero-Sequence Currents in an Unbalanced Three-Phase Power System Using Electric Springs

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