Study of a Small-Scale Controllable Reactor and Conceptual Design of a 35kV/5Mvar HTS Reactor

2014 ◽  
Vol 960-961 ◽  
pp. 1258-1263
Author(s):  
Ying Xu ◽  
Li Ren ◽  
Yue Jin Tang ◽  
Meng Song ◽  
Jing Dong Li ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Transmission Lines ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Small Scale ◽  
Efficient Operation ◽  
Reactive Compensation ◽  
Dc Bias ◽  
Controllable Reactor ◽  
Copper Coil

Since Ultra High Voltage (UHV) transmission lines have the high charging capacitance, continuous reactive power compensation is vital for efficient operation of long transmission power lines or cables. A continuous reactive compensation will reduce the transmission losses and increase the transmission capacity of active power. In order to achieve the continuous reactive power compensation, we choose the magnetic saturable type reactor. The principle of a magnetic saturable reactor requires a high current ampere-turn coil as its dc bias, and this coil is necessary to use a high temperature superconducting (HTS) winding. As the first stage of the study, we have constructed a 220V small-scale prototype which the dc bias is made of copper coil instead of the HTS coil. The copper coil of the dc bias in small-scale reactor has the same ampere-turn with a 220V HTS controllable reactor (HCR), so its performance keeps the same except the HTS part. Based on this, we made a conceptual design for a 35kV/5Mvar HCR. The output property and harmonic property have been studied by simulation and experiment. The results prove that it can obtain a continuous controllable reactive power output.

Design and Test of Saturable Reactor

2012 ◽  
Vol 516-517 ◽  
pp. 1342-1347 ◽  
Author(s):  
Meng Song ◽  
Li Ren ◽  
Kun Nan Cao ◽  
Ying Xu ◽  
Hong Da Dong ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Reactive Power ◽  
Power Lines ◽  
Small Scale ◽  
Long Distance ◽  
Efficient Operation ◽  
Reactor Structure ◽  
Electric Power Grid ◽  
Simulating Calculation ◽  
Ac Transmission

With the expansion of the grid, continuous reactive power compensation is vital for efficient operation of long transmission power lines or cables. Yunnan Electric Power Grid is planning to development saturable reactors for 500 kV long distance AC transmission lines. As the first stage of the development plan, the appropriate saturable reactor structure should be presented and verified by experiment. In this paper, different ferromagnetic materials, core structures and winding arrangements of saturable reactors are analyzed. Then, appropriate saturable reactor structure is determined by simulating calculation. Based on that, a small-scale prototype is designed and fabricated. The experimental results show that it can obtain a continuous controllable reactive power output.

Simulation Study on Dynamic Reactive Power Compensation of Grid-Connected Wind Farms

2013 ◽  
Vol 756-759 ◽  
pp. 4171-4174 ◽  
Author(s):  
Xiao Ming Wang ◽  
Xing Xing Mu
Keyword(s):  
Voltage Stability ◽  
Wind Farm ◽  
Reactive Power ◽  
Wind Farms ◽  
Reactive Power Compensation ◽  
Wind Speeds ◽  
Wind Generators ◽  
Reactive Compensation ◽  
Farm Model ◽  
Set Up

With the Asynchronous wind generators as research object, this paper analyzes the problems of the voltage stability and the generation mechanism of the reactive power compensation during the wind farms connected operation. For paralleling capacitor bank has shown obvious defects, therefore this paper employs dynamic reactive power compensation to improve reactive characteristics of grid-connected wind farms. With the influences of different wind disturbances and grid faults on wind farms, wind farm model is set up and dynamic reactive power compensation system and wind speeds are built in the Matlab/Simulink software, The simulation result shows that they can provide reactive power compensation to ensure the voltage stability of the wind farms. But STATCOM needs less reactive compensation capacity to make sure the voltage and active power approaching steady state before the faults more quickly, Therefore STATCOM is more suitable for wind farms connected dynamic reactive power compensation.

The Application of S7-200 PLC Reactive Compensation Device in Small Substation

2012 ◽  
Vol 479-481 ◽  
pp. 1476-1480
Author(s):  
Qing He Chu ◽  
Wen Si Cao ◽  
Zhen Nie
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
High Reliability ◽  
Reactive Power Compensation ◽  
Control Device ◽  
Reactive Compensation ◽  
Reconstruction Project ◽  
Compensation Device ◽  
And Control

In the present rural power grid reconstruction project ,according to the problems of capacitor reactive power compensation in rural small substation. Take a small substation for instance, according to its operation and control method, set the criterion of the capacitor bank switching. A new high reliability, flexible reactive power compensation control device based on s7-200 PLC is designed. It plays an important role in improving the power supply , guaranteeing the quality of voltage, reducing the loss of rural power gid.

Identification of the best topology of delta configured three phase induction generator for distributed generation through experimental investigations

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Vanka Bala Murali Krishna ◽  
Sandeep Vuddanti
Keyword(s):  
Distributed Generation ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Reactive Power Compensation ◽  
Induction Generator ◽  
Experimental Investigations ◽  
Small Scale ◽  
Empirical Formulas ◽  
Simple Method ◽  
Main Challenge

Abstract Research on Self –excited induction generator (SEIG) brings a lot of attentions in the last three decades as a promising solution in distributed generation systems with low cost investment. There are two important fixations to attend in the operation of SEIG based systems, a) excitation and b) voltage regulation. Many procedures are reported regarding selection of excitation capacitance in the literature, based on state-state analysis, dynamic modeling, empirical formulas and machine parameters which involve various levels of complexity in findings. Moreover, the voltage regulation is the main challenge in implementation of SEIG based isolated systems. To address this problem, many power electronic-based schemes are proposed in the literature and but these solutions have few demerits importantly that additional cost of equipment and troubles due to failure of protection schemes. In particular, the installation of SEIG takes place at small scale in kW range in remote/rural communities which should not face such shortcomings. Further in case of off-grid systems, the maximum loading is fixed based on connected rating of the generator. This paper presents the various methods to find excitation capacitance and illustrates an experimental investigation on different possible reactive power compensation methods of delta connected SEIG and aimed to identify a simple method for terminal voltage control without power electronics. In this experimental work, the prime-mover of the generator is a constant speed turbine, which is the emulation of a micro/pico hydro turbine. From the results, it is found that a simple delta connected excitation and delta configured reactive power compensation limits voltage regulation within ±6% while maintaining the frequency of ±1%, which make feasible of the operation successfully in remote electrification systems.

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

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.

Energy-Saving Analysis for Power System Reactive Power Compensation

2012 ◽  
Vol 608-609 ◽  
pp. 1151-1155 ◽  
Author(s):  
Xiao Hua Yuan ◽  
Xian Bin Dai
Keyword(s):  
Power System ◽  
Energy Saving ◽  
Transmission Lines ◽  
Reactive Power ◽  
Mechanical Energy ◽  
Rapid Development ◽  
Electrical Energy ◽  
Reactive Power Compensation ◽  
Electric And Magnetic Fields ◽  
Shunt Capacitor

The alternator output power in the power system can be divided into active and reactive power. The active power (in kW) is that part of the electrical energy for doing work and heat loss, such as the conversion of mechanical energy, heat, light. The reactive power (in kVar) is that part of the electrical energy for the exchange of electric and magnetic fields in the circuit, such as transformers, motors, through the magnetic field can be passed to convert electrical energy; transmission lines in cable systems and a variety of load reactance (inductance and capacitance), and consumption of reactive power. With the rapid development of power system to study how to reduce energy loss in the power system is a very meaningful. In this paper, The Shizuishan plant desulfurization project as an example, illustrates the shunt capacitor reactive power compensation of the power system energy saving.

A Research of Reactive Compensation Scheme Based on the Hybrid Parallel Mode of SVG and PPF

2014 ◽  
Vol 556-562 ◽  
pp. 3627-3632
Author(s):  
Cai Lin Li ◽  
Xin Wang Sun
Keyword(s):  
Calculation Method ◽  
Reactive Power ◽  
Design Method ◽  
Reactive Power Compensation ◽  
Determination Method ◽  
Compensation Scheme ◽  
Compensation Structure ◽  
Reactive Compensation ◽  
Static Var Generator ◽  
Parallel Mode

A kind of hybrid parallel compensation scheme combining active compensation and passive compensation technology was proposed in this paper. The regulating function of reactive power can be realized dynamically and smoothly by means of integrating Static Var Generator (SVG) with passive filter (PPF) and then paralleling with the system load side bus. The harmonic current and voltage in the system could be filtered out. The calculation method of total compensation capacity, the determination method of SVG compensation capacity and the design method of PPF filter branches has been presented. Simulation result has proved that this scheme can achieve reactive power compensation and complete harmonic governance at the same time. Besides, the problems of reactive power and harmonic in the power system can be solved effectively, and the good engineering practical value is obvious. Figure 1 Hybrid parallel compensation structure diagram of SVG and PPF

Research on MCR Type Static Var Power Compensator Device in Wind Farms

2013 ◽  
Vol 433-435 ◽  
pp. 1325-1329
Author(s):  
Wei Zheng ◽  
Li Guang Shi ◽  
Shi Qun Li ◽  
Yong Zhi ◽  
Run Qing Bai ◽  
...  
Keyword(s):  
Large Scale ◽  
Wind Farm ◽  
Reactive Power ◽  
Power Transmission ◽  
Field Tests ◽  
Wind Farms ◽  
Facts Devices ◽  
Reactive Compensation ◽  
New Energy ◽  
Controllable Reactor

With the application of FACTS devices in large-scale new energy base, in the light of FACTS devices installed in each wind farm in Gansu Jiuquan, which can supply reactive compensation for the power transmission system and stable the grid voltage, in this paper the magnetic controllable reactor (MCR) type static var compensator (SVC) is studied deeply. The paper introduces the working principle and characteristics of the MCR-SVC. In connection with MCR equivalent circuit, the simulation model is built in MATLAB/SPS, the simulation results and field tests verify the reactive power compensation effect of MCR-SVC during wind farms.

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