Distributed Volt Ampere Reactive Power Compensation of Modern Power System to Control High Voltage

The problem of selecting the electric power system control nodes is studied. By performing control of these modes, matters concerned with providing reliable power supply of the required quality to consumers can be settled in the most efficient manner. As an example, a fragment of the electric power system mathematical model used in the Finist mode-setting simulator for a power system dispatch control center operator is considered, which represents a highly branched electrical network consisting of eleven 110 kV nodes, three 220 kV nodes connected with the system, and two generator nodes. A new procedure for selecting the control nodes is proposed, which takes into account a combination of different indicators having different measurement units, dimensions and scales is proposed. These indicators characterize the following properties of power system nodes: the reactive power fraction absorbed at a node, the sensitivity of voltage to reactive load variations, the number of connected power lines, and statistical indicators characterizing the change of voltage at the nodes and reactive power flows for different options of installing the reactive power compensation devices. For combined use of these indicators, they were ranked according to the efficiency of installing reactive power compensation devices in the system. For each indicator, a scale of five ranks (intervals) is set, which determine the preferences (qualitative judgments) of the researcher in evaluating the reactive power compensation devices installation efficiency at the system nodes. The highest rank (5) corresponds to the maximum efficiency, and the lowest rank (1) corresponds to the minimum efficiency. To calculate the individual (integral) priority indicator of installing reactive power compensation devices, the ranks of indicators are added together, and their sum is divided by the product of the number of ranks by the number of the used indicators (features). Based on the calculation results, the rating (location) of each node is determined, and the nodes for installing the reactive power compensation devices are selected according to their effect on ensuring the electric power system operation reliability, active power losses in the network, and voltage regulation. Thus, a new procedure is presented for determining the integral indicators for comprehensively estimating the properties of complex electric power system nodes and selecting the controlled nodes using a system of various indicators. These indicators characterize the studied nodes in terms of the efficiency of installing reactive power compensation devices to reduce active power losses in the network, voltage regulation, and ensuring the electric power system operational reliability. The validity of the results obtained in the study is confirmed by their comparison with the indicators of the balance-conductivity method, which has proven itself in solving problems connected with determining the nodes for controlling electric power system operation modes.

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Suppression and reactive power compensation in power system

10.1109/auteee52864.2021.9668839 ◽

2021 ◽

Author(s):

Jialin Li ◽

Honggang Ding ◽

Ye Sun ◽

Jingming Guo ◽

Jiapeng Wang ◽

...

Keyword(s):

Power System ◽

Reactive Power ◽

Reactive Power Compensation

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Saddle Node Bifurcation Point Analysis of Voltage Stability of IEEE 30-BUS Power System for Removal of Generation through Bacteria Foraging Optimization Algorithm

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.31.18196 ◽

2018 ◽

Vol 7 (3.31) ◽

pp. 36

Author(s):

Srikanth B. Venkata ◽

Lakshmi Devi Ai

Keyword(s):

Power System ◽

Optimization Algorithm ◽

Reactive Power ◽

Reactive Power Compensation ◽

Bacterial Foraging Optimization ◽

Saddle Node Bifurcation ◽

Saddle Node ◽

Point Analysis ◽

Bacteria Foraging Optimization Algorithm ◽

Bacterial Foraging Optimization Algorithm

This paper deals with the identification of instability nodes of IEEE 30 BUS power system to generation removal. Optimal sizing and locations of reactive power compensations are obtained. Firstly one of the generators is assumed to be removed from service and the saddle node bifurcation (SNB) point voltages are evaluated without reactive power compensation. Secondly two generators are assumed to be removed from service and the saddle node point voltage magnitudes are obtained without reactive power compensation. For both cases the study is conducted by placing optimal reactive power compensations at optimal locations using Bacterial Foraging Optimization Algorithm (BFOA).

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Researches on Reactive Compensation for Long-Distance and Highcapacity Hybrid Submarine Cable Lines

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.433-440.2406 ◽

2012 ◽

Vol 433-440 ◽

pp. 2406-2410

Author(s):

Dong Mei Sun ◽

Jun Wen

Keyword(s):

High Voltage ◽

Transmission Lines ◽

Reactive Power ◽

High Capacity ◽

Reactive Power Compensation ◽

Submarine Cable ◽

Long Distance ◽

Power Frequency ◽

Electro Magnetic ◽

Cable Lines

In order to balance reactive power, reduce line losses, prevent excessive power frequency and switching over-voltage and adjust and control the line voltage etc. The long-distance and high voltage transmission lines are needed reactive power compensation. High voltage overhead transmission lines and high voltage submarine cable (including mixed-submarine) transmission lines are different, for example, the capacitance in the submarine cable lines is larger than in the conventional overhead lines. Therefore, the reactive power compensation on the EHV transmission lines which contains submarine cable lines is focus on the compensation of submarine cable lines. The reactive power compensation in 500 kV AC submarine cable interconnection project for Hainan power grid and Guangdong power grid[1], which is the first 500 kV long-distance and high-capacity sea trails interconnection project in China and which is just completed soon, is researched by Electro-Magnetic Transient Program——PSCAD/EMTDC (Power System Computer Aided Design/ Electro Magnetic Transient in DC System in this paper). The simulation results verifies that the role of shunt reactor which could absorb charging power and suppress the power frequency overvoltage for the long-distance and high-capacity hybrid submarine cable lines. The conclusions can offer references to suppress power frequency overvoltage and the reactive power compensation in extra high voltage transmission lines which is the mixed mode of overhead transmission lines and submarine cables.

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Design of HTS Magnetically Controlled Saturable Reactor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.380-384.2982 ◽

2013 ◽

Vol 380-384 ◽

pp. 2982-2985

Author(s):

Hong Da Dong

Keyword(s):

High Temperature ◽

High Voltage ◽

Large Scale ◽

Reactive Power ◽

Magnetic Circuit ◽

Reactive Power Compensation ◽

Model Design ◽

Power Capacity ◽

Wide Range ◽

Small Capacity

There are many problems for traditional reactive power compensation devices to be applied in the grid, such as discontinuous adjustment, small capacity, complex control and harmonics. This paper aims to study a high temperature superconducting magnetically controlled saturable reactor (HTS MCSR), which has a wide range of stepless adjustment. It has a good application prospect in large scale reactive power compensation devices. Based on research of theory and core structure, a shaped-cylinder core is proposed. By means of calculation of saturable reactor and analysis of algebraic and magnetic circuit model, design of 220V HTS MCSR is finished. Results of normal conductive reactor prototype and simulations verify that the range of inductance adjustment is very wide. Furthermore, conceptual design of 35kV HTS MCSR confirms its reactive power capacity is so large, therefore, it is suitable for high voltage power system.

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Dynamic Stability Improvement of Power System with VSC-HVDC Transmission

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.27.18003 ◽

2018 ◽

Vol 7 (3.27) ◽

pp. 500

Author(s):

R Vasudevan ◽

S Ramalakshmi

Keyword(s):

Power System ◽

Dynamic Stability ◽

High Voltage ◽

Transient Stability ◽

Reactive Power ◽

Average Frequency ◽

Management Approach ◽

Communication Delays ◽

Hvdc Transmission ◽

Central Controller

A new management approach for the reactive-power injections of Voltage supply Converters in High Voltage DC (VSC-HVDC) multi-terminal Systems to enhance grid transient stability. A reactive-power supplementary signal is provided for each convertor. Its worth is proportional to the frequency deviation of its consequent AC bus with admiration to the weighed-average frequency of the multiterminal system stations. The hope is to extend (decrease) the magnetism torsion of generators close to those terminals during which the frequency is superior to (below) the weighed-average frequency used. The AC frequency for all VSC stations is ever more accessible regionally for synchronization functions and will be utilized by a central controller. Simulations are allotted victimization PSS/E and therefore the outcome have revealed that transient stability is enlarged victimization this approach. Since this approach uses world capability of all VSC stations, the collision of the communication delays has been analyzed, concluding that the depressing consequence is modest, for realistic latency values.

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