Conservative Power Theory (CPT): A New Approach to the Tuned Passive Filter Design

Schaffer, G.; Moura, Fabrício Augusto Matheus; Mendonça, M. V. B.; Junior, Ataide; Albertini, Madeleine R. M. C.; Camacho, J.R.

doi:10.24084/repqj17.278

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…Some characteristics of the CPT approaches, with five or six component currents [17] [18], are like the CPC theory and suffer from similar limitations. Despite the limitations requiring a modified formulation according to each system topology, CPT and CPC approaches have been applied recently to filter design [19] and to reactive compensation [16]. The IEEE Std 1459-2010 [2] adopted a similar approach in identifying several reactive and distortion power components.…”

Section: B Power Parameters Research During the Past 10 Yearsmentioning

confidence: 99%

Active Currents, Power Factor, and Apparent Power for Practical Power Delivery Systems

Malengret¹,

Gaunt

2020

IEEE Access

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Concepts of apparent power and power factor as measures of a system's power delivery capability are over a century old but have not been defined in one general, rigorous and acceptable way. Instantaneous power is defined precisely, and average power measured over a selected period is widely accepted. The many ways of defining and measuring reactive and apparent power in single and three phase systems are based on different assumptions and give different results in real cases. Building on definitions in the IEEE Standard 1459-2010, this paper formulates in vector space linear algebra and the frequency domain, the active wire currents as those that cause the minimum losses in a network for the power delivered. Power factor measures the relative efficiency of power delivery as defined by the losses. Apparent power consistent with early terminology is the maximum power that can be sourced for the same original line losses and has the unit of power: Watt. It is identified without requiring the contentious concept of reactive and non-active power components. Measurements based on this approach are independent of assumptions about sinusoidal waveform, voltage and current balance, and frequencydependent wire resistances, and apply to power delivery systems with any number of wires. The rigor of this novel general formulation is important for technical design of compensators and inverters; analyzing power system losses, delivery efficiency and voltage stability; and electricity cost allocation and pricing.

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Section: B Power Parameters Research During the Past 10 Yearsmentioning

confidence: 99%

Active Currents, Power Factor, and Apparent Power for Practical Power Delivery Systems

Malengret¹,

Gaunt

2020

IEEE Access

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“…In contrast, active power filters (APFs) have complex structural and control requirements, making their operation conditions more demanding [8]. The main impediments for the development of PPF technology are the difficulty of continuously adjusting parameters, the need for a better understanding of the working mechanism of dynamic tuning, and challenges in optimizing the design and implementation of key components that cannot meet the requirements of practical engineering [9]. After ten years of research, the dynamic tuning power filter (DTPPF) was developed .…”

Section: Introductionmentioning

confidence: 99%

Cloud Server-Assisted Remote Monitoring and Core Device Fault Identification for Dynamically Tuned Passive Power Filters

Wang,

Chen,

Deng

2023

Applied Sciences

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Reliability and safety are crucial for the operation of a dynamically tuned passive power filter (DTPPF). Safe performance of DTTPFs implies complete normal filtering without failure within a specified period. To prevent potential disaster or economic loss, it is desirable to achieve early warning of any core device faults in a DTPPF based on its running state and to optimize its harmonic mitigation performance. In this paper, we explore effective methods for identifying core device faults in DTPPFs. First, we summarize the characteristic parameters of faults, running state parameters, parameters required for fault monitoring, and fault type parameters. Then, a cloud server-assisted remote monitoring and fault identification system for DTPPF is proposed, which consists of monitoring system’s architecture and cloud servers’ software architecture as well as software design of the back-end service layer and functional design of the front-end application layer. Our experiments demonstrate that the proposed system can monitor the real-time operational status of the DTPPF, enabling remote diagnosis and identification of core device faults. Moreover, it is user-friendly, as it is capable of optimizing equipment maintenance schedules and utilizing manufacturers’ service capacities. Therefore, this research provides a theoretical foundation for harmonic mitigation in low-voltage distribution networks and is valuable for practical engineering applications in industrial power grids.

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“…After traditional PPFs work for a long time, their inductance and capacitance will deviate from the standard value as the temperature changes, increasing the total harmonic distortion. In severe cases, the resonance point drifts and resonates with the system, impairing filter efficiency and filter performance [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A Novel Integrated Method for Harmonic Suppression and Reactive Power Compensation in Distribution Network

et al. 2022

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Aiming at the serious harmonic pollution and the low power factor in the distribution network of industrial enterprises, this paper develops an integrated method for harmonic suppression and reactive power compensation suitable for the distribution network of industrial enterprises. The integrated method realizes the dual functions of harmonic filtering and reactive power compensation, and filters out the harmonic current to get a symmetrical current waveform while ensuring safe operation of the power compensator. In addition, it solves the problems of high harmonic content, small power factor in the distribution network, and device burnout caused by direct input of reactive power compensator. The main contributions of this paper are as follows: (1) According to the demand for the integration of harmonic suppression and reactive power compensation, the steps of integrated method for harmonic suppression and reactive power compensationare proposed, and then the methods for harmonic filtering and reactive power compensation are investigated; (2) a method for designing the capacity of a filter capacitor and the rated parameter of an electromagnetic coupling reactance converter is proposed, and an optimization simulation system is constructed to design the parameters of the filter; (3) a simulation system is developed, followed by parameter design and simulation analysis of harmonic filtering subsystem (HFSS), reactive power compensation subsystem (RPCSS) and the integrated system of harmonic suppression and reactive power compensation. Simulation results verify that the HFSS is put into operation first and then switched off later to ensure the normal operation of other equipment in the distribution network. After the treatment, the power factor, harmonic current content and total distortion rate all meet the national standards. The integrated method can dynamically track harmonics and reactive power changes, filter out harmonics, improve power factor and the symmetry level of the power source, and ensure the normal operation of other equipment in the distribution network. The research results lay a certain theoretical and technical foundation for the harmonic filtering and reactive power compensation theory, technology and its device innovation to achieve effective suppression of power harmonics and reactive power compensation.

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Conservative Power Theory (CPT): A New Approach to the Tuned Passive Filter Design

Cited by 4 publications

References 4 publications

Active Currents, Power Factor, and Apparent Power for Practical Power Delivery Systems

Active Currents, Power Factor, and Apparent Power for Practical Power Delivery Systems

Cloud Server-Assisted Remote Monitoring and Core Device Fault Identification for Dynamically Tuned Passive Power Filters

A Novel Integrated Method for Harmonic Suppression and Reactive Power Compensation in Distribution Network

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