scholarly journals Inactive power detection in AC network

2021 ◽  
Vol 11 (2) ◽  
pp. 966
Author(s):  
Nickolay I. Schurov ◽  
Sergey V. Myatezh ◽  
Alexandr V. Myatezh ◽  
Boris V. Malozyomov ◽  
Alexandr A. Shtang
Keyword(s):  
Reactive Power ◽  
Power Level ◽  
Phase Shifts ◽  
Active Power ◽  
Power Balance ◽  
Stationary Mode ◽  
Instantaneous Power ◽  
Methodological Errors ◽  
The Future ◽  
Ac Networks

Using the examples of wave and vector diagrams, we study the conditions for the appearance of components of inactive power in an AC network, which are known as reactive power and distortion power. It is shown that the components of the active, reactive power and distortion power are mutually orthogonal and form a power balance, which can be violated mainly due to methodological errors in calculating these components under conditions of non-stationary mode parameters. It is established that the interaction of reactive power and distortion power occurs at the instantaneous power level, and changing their phase shifts allows you to adjust the shape of the resulting power without involving additional active power in the AC network. The results obtained will allow not only to correctly determine the proportion and nature of the components of inactive capacities, which is valuable for solving the problems of optimizing modes in AC networks, but also to create effective technical means of compensating for the identified inactive capacities in the future.

scholarly journals Interpretasi Praktis Terhadap Istilah-Istilah Daya pada Rangkaian Listrik Satu Fase Sinusoidal

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Adlan Bagus Pradana ◽  
Unan Yusmaniar Oktiawati ◽  
Jimmy Trio Putra ◽  
Dhanis Woro Fittrin Selo Nur Giyatno ◽  
Atikah Surriani
Keyword(s):  
Computer Simulations ◽  
Daily Activity ◽  
Power Analysis ◽  
Single Phase ◽  
Reactive Power ◽  
Electrical Engineering ◽  
Active Power ◽  
General Application ◽  
Instantaneous Power ◽  
Complex Power

In electrical engineering, there are several power terms; active power, reactive power, instantaneous active power, instantaneous active power, instantaneous power, apparent power and complex power. Even though are used in daily activity, electrical practitioners are facing difficulty to explain those terms practically. This paper tries to solve those difficulty by interpret those term in practical way. Firstly, each power term are defined theoretically. Then those terms are presented mathematically. Next, power in single phase sinusoidal electric network is analyzed. Theoretical definition result is connected with power analysis result. Computer simulations are held to strengthen interpretation result. Considering the width of discussion area, this paper only covers most general application, that is single phase sinusoidal network.

scholarly journals Loss Modeling of Large Hydrogenerators for Cost Estimation of Reactive Power Services

2021 ◽  
Author(s):  
Yannick Cyiza Karekezi ◽  
Thomas Øyvang ◽  
Jonas Kristiansen Nøland
Keyword(s):  
Cost Estimation ◽  
Data Clustering ◽  
Reactive Power ◽  
Power Level ◽  
Active Power ◽  
New Approach ◽  
Speed Up ◽  
Additional Costs ◽  
Clustering Approach ◽  
Additional Losses

A new approach to predict the additional costs of reactive power system services delivered by large hydrogenerators is proposed in this letter. It is based on the application of the accumulated average efficiency (AAE), which has recently been proposed. An optimal operational path within the capability diagram with minimal losses is derived. This path can be used to calculate additional losses from operational regimes deviating from the optimal one for each active power level. Finally, the additional losses are accumulated in a similar manner as the AAE to estimate the extra cost of the operational regime, with ideal operation as the reference. In addition, the accuracy of a data clustering approach is explored to speed up the computation of the AAE and the accumulation of additional costs.

scholarly journals Single phase PQ theory based control of active power filter for power quality enhancement in DG connected microgrid

2018 ◽  
Vol 7 (1.8) ◽  
pp. 26
Author(s):  
M T L Gayatri ◽  
Alivelu M Parimi
Keyword(s):  
Power Quality ◽  
Reactive Power ◽  
Research Work ◽  
Active Power Filter ◽  
Active Power ◽  
Environmental Data ◽  
Solar Irradiation ◽  
Power Balance ◽  
Power Filter ◽  
Ac Microgrid

The number of DG systems like Photovoltaic and Wind Energy Systems are now penetrating more into the conventional power system. In microgrids, loads and generators are in the close vicinity. However, due to the unpredictable nature of non-conventional energy resources like wind and solar with varying loads, it is almost impossible to maintain an accurate power balance between the source and load. Furthermore, to compensate reactive power and harmonics of this AC microgrid and also to maintain a reasonable power quality, it is essential to use a state-of-the-art controller like shunt active power filter (Sh. APF). This research work is an effort in the same direction wherein the actual environmental data like solar irradiation and wind profile have been collected with the help of the weather monitoring system in BITS-Pilani Hyderabad Campus and this data has been used in conceiving and designing an AC microgrid of suitable capacity. The loads included in this system are both harmonic and reactive in nature. Finally, a Sh. APF with an appropriate control scheme has been incorporated in the proposed AC microgrid so that impeccable power quality is maintained at the load end, apart from achieving a good power balance.

scholarly journals Loss Modeling of Large Hydrogenerators for Cost Estimation of Reactive Power Services

2021 ◽  
Author(s):  
Yannick Cyiza Karekezi ◽  
Thomas Øyvang ◽  
Jonas Kristiansen Nøland
Keyword(s):  
Cost Estimation ◽  
Data Clustering ◽  
Reactive Power ◽  
Power Level ◽  
Active Power ◽  
New Approach ◽  
Speed Up ◽  
Additional Costs ◽  
Clustering Approach ◽  
Additional Losses

A new approach to predict the additional costs of reactive power system services delivered by large hydrogenerators is proposed in this letter. It is based on the application of the accumulated average efficiency (AAE), which has recently been proposed. An optimal operational path within the capability diagram with minimal losses is derived. This path can be used to calculate additional losses from operational regimes deviating from the optimal one for each active power level. Finally, the additional losses are accumulated in a similar manner as the AAE to estimate the extra cost of the operational regime, with ideal operation as the reference. In addition, the accuracy of a data clustering approach is explored to speed up the computation of the AAE and the accumulation of additional costs.

The Fuzzy PI Control for the DSTATCOM Based on the Instantaneous Power Balance

2013 ◽  
Vol 648 ◽  
pp. 357-360
Author(s):  
Deng Xiang Yang ◽  
Guang Yao Zhu ◽  
Qun Feng Zhu
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Voltage Control ◽  
Access Point ◽  
Public Access ◽  
Power Balance ◽  
Pi Control ◽  
Voltage Control Strategy ◽  
Instantaneous Power ◽  
Direct Voltage

Distribution Static Synchronous Compensator (DSTATCOM) to the public through the connection point into the reactive power can adjust the voltage of public access point, so as to meet the voltage quality. First of all papers DSTATCOM system in accordance with the instantaneous power balance theory derived DSTATCOM voltage used to control the direct voltage control strategy. In the control strategy without current detection circuit with traditional cascade control, compared with the control is simple, the advantages of fast response. And voltage control strategy for the direct control of the controller by the system parameters impact the performance of larger defects, a direct voltage DSTATCOM fuzzy PI control strategy, so that the instantaneous power balance in accordance with the direct voltage control has better control performance.

Improving the efficiency of oilfield electric power distribution

2019 ◽  
pp. 79-87
Author(s):  
Yu. F. Yu. F. Romaniuk ◽  
О. V. Solomchak ◽  
М. V. Hlozhyk
Keyword(s):  
Power Distribution ◽  
Reactive Power ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Active Power ◽  
Oil Field ◽  
Total Power ◽  
Simultaneous Increase ◽  
Active Load ◽  
Step Down

The issues of increasing the efficiency of electricity transmission to consumers with different nature of their load are considered. The dependence of the efficiency of the electric network of the oil field, consisting of a power line and a step-down transformer, on the total load power at various ratios between the active and reactive components of the power is analyzed, and the conditions under which the maximum transmission efficiency can be ensured are determined. It is shown by examples that the power transmission efficiency depends not only on the active load, but also largely on its reactive load. In the presence of a constant reactive load and an increase in active load, the total power increases and the power transmission efficiency decreases. In the low-load mode, the schedule for changing the power transmission efficiency approaches a parabolic form, since the influence of the active load on the amount of active power loss decreases, and their value will mainly depend on reactive load, which remains unchanged. The efficiency reaches its maximum value provided that the active and reactive components of the power are equal. In the case of a different ratio between them, the efficiency decreases. With a simultaneous increase in active and reactive loads and a constant value of the power factor, the power transmission efficiency is significantly reduced due to an increase in losses. With a constant active load and an increase in reactive load, efficiency of power transmission decreases, since with an increase in reactive load, losses of active power increase, while the active power remains unchanged. The second condition, under which the line efficiency will be maximum, is full compensation of reactive power.  Therefore, in order to increase the efficiency of power transmission, it is necessary to compensate for the reactive load, which can reduce the loss of electricity and the cost of its payment and improve the quality of electricity. Other methods are also proposed to increase the efficiency of power transmission by regulating the voltage level in the power center, reducing the equivalent resistance of the line wires, optimizing the loading of the transformers of the step-down substations and ensuring the economic modes of their operation.

scholarly journals Improving Power Quality by a Four-Wire Shunt Active Power Filter: A Case Study

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1951
Author(s):  
Mihaela Popescu ◽  
Alexandru Bitoleanu ◽  
Mihaita Linca ◽  
Constantin Vlad Suru
Keyword(s):  
Power Quality ◽  
Quality Indicators ◽  
Reactive Power ◽  
Control Method ◽  
Active Power Filter ◽  
Active Power ◽  
Current Control ◽  
Shunt Active Power Filter ◽  
Power Filter ◽  
Unbalanced Load

This paper presents the use of a three-phase four-wire shunt active power filter to improve the power quality in the Department of Industrial Electronics of a large enterprise from Romania. The specificity is given by the predominant existence of single-phase consumers (such as personal computers, printers, lighting and AC equipment). In order to identify the power quality indicators and ways to improve them, an A-class analyzer was used to record the electrical quantities and energy parameters in the point of common coupling (PCC) with the nonlinear loads for 27 h. The analysis shows that, in order to improve the power quality in PCC, three goals must be achieved: the compensation of the distortion power, the compensation of the reactive power and the compensation of the load unbalance. By using the conceived three-leg shunt active power filter, controlled through the indirect current control method in an original variant, the power quality at the supply side is very much improved. In the proposed control algorithm, the prescribed active current is obtained as a sum of the loss current provided by the DC voltage and the equivalent active current of the unbalanced load. The performance associated with each objective of the compensation is presented and analyzed. The results show that all the power quality indicators meet the specific standards and regulations and prove the validity of the proposed solution.

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