Logic Design of Improved Backup Power Automatic Switching Considering the Influence of Small Hydropower Stations

2012 ◽  
Vol 463-464 ◽  
pp. 1638-1642
Author(s):  
Chen Jie Zhou ◽  
Yi Xiong ◽  
Liang Qin ◽  
Xiao Ming Zha
Keyword(s):  
Power Supply ◽  
Power Grid ◽  
Logic Design ◽  
Small Hydropower ◽  
Distributed Power ◽  
The Stability ◽  
Reliable Power Supply ◽  
Hydropower Stations ◽  
Small Capacity ◽  
Automatic Switching

The correct and quick operation of backup power automatic switching（BPAS）devices is an effective guarantee of reliable power supply to the system. However, when transformer substations are connected to small-capacity distributed power like the local small hydropower stations, the conventional BPAS devices usually fail to get into operation, which leads to the loss of power in some parts of the system. To solve this shortage，this article comes up with an improved scheme of BPAS, which has been proved through PSCAD simulation to be effective in enhancing the stability and reliability of the power grid

Influence of distributed power supply in distributed power distribution network

2021 ◽  
pp. 1-8
Author(s):  
Xin Shen ◽  
Hongchun Shu ◽  
Min Cao ◽  
Nan Pan ◽  
Junbin Qian
Keyword(s):  
Power Supply ◽  
Power Distribution ◽  
Short Circuit ◽  
Power Grid ◽  
Distribution Network ◽  
Distribution Networks ◽  
Power Supplies ◽  
Power Distribution Network ◽  
Power Sources ◽  
Distributed Power

In distribution networks with distributed power supplies, distributed power supplies can also be used as backup power sources to support the grid. If a distribution network contains multiple distributed power sources, the distribution network becomes a complex power grid with multiple power supplies. When a short-circuit fault occurs at a certain point on the power distribution network, the size, direction and duration of the short-circuit current are no longer single due to the existence of distributed power, and will vary with the location and capacity of the distributed power supply system. The change, in turn, affects the current in the grid, resulting in the generation and propagation of additional current. This power grid of power electronics will cause problems such as excessive standard mis-operation, abnormal heating of the converter and component burnout, and communication system failure. It is of great and practical significance to study the influence of distributed power in distributed power distribution networks.

scholarly journals Discussion on the Factors Affecting the Stability of Microgrid Based on Distributed Power Supply

2013 ◽  
Vol 05 (04) ◽  
pp. 1344-1346 ◽  
Author(s):  
Ye Xu ◽  
Zhao-hong Shi ◽  
Jin-quan Wang ◽  
Peng-fei Hou
Keyword(s):  
Power Supply ◽  
Distributed Power ◽  
Factors Affecting ◽  
The Stability

Research on Stability of Power System with Distributed Generation Synthesis Load Model

2013 ◽  
Vol 341-342 ◽  
pp. 1374-1379
Author(s):  
Yang Liu ◽  
Zhen An Zhang ◽  
Wei Liu ◽  
Ya Nan Wang
Keyword(s):  
Power System ◽  
Distributed Generation ◽  
Transient Stability ◽  
Power Grid ◽  
Stable Operation ◽  
Power Network ◽  
Small Hydropower ◽  
Large Power ◽  
Load Model ◽  
The Stability

With different element models and parameters in power system, the transient stability analysis results are also different, especially the model of generator and load. Based on the actual parameters of Hunan power grid, this paper builds the synthesis load model of the distribution network with small hydropower considered, and then the Hunan simulation network can also be got. Using PSASP, analyses the transient stability of Hunan power system with distributed small hydropower under different operation modes systematically and comprehensively. Through an overall check of the stability level in each Hunan area, and then compared with the analysis results of Hunan power grid based on the currently used load model , the influences of the distributed small hydropower on the safe and stable operation of the large power network are summarized.

Analysis on Primary Frequency Regulation Function Tests for Thermal Power Units

2014 ◽  
Vol 986-987 ◽  
pp. 1187-1190
Author(s):  
Li Jie Kang ◽  
Wei Ping Liang
Keyword(s):  
Power Supply ◽  
Load Capacity ◽  
Power Grid ◽  
Thermal Power ◽  
Vital Role ◽  
Frequency Regulation ◽  
Regulation Function ◽  
The Stability ◽  
Primary Frequency ◽  
Power Dispatching

With the increase of the load capacity and the development of the automation degree, the power dispatching center has a higher requirement for the primary frequency regulation function of the unit aircrew. After a certain period of time when the unit has been put into operation, the primary frequency regulation function must have the conditions to be put into operation, so that the unit can be involved in grid frequency at any time when the conditions are satisfied and the power supply quality can be fully guaranteed [1]. The regulation performance of primary frequency regulation plays a vital role in maintaining the stability of the unit aircrew and the power grid, so it is very necessary to conduct the frequency tests for the thermal power units [2]. In this paper, we describe the disturbance tests and recovery tests under different load points and different network frequencies. Through the analysis, we can draw the conclusion that the primary frequency regulation function of unit 1 can fully meet the requirement of the frequency regulation of the power grid.

Study on Selective Leakage Protection System of Mine High Voltage Grid Based on Harmonic Phase Comparison

2015 ◽  
Vol 9 (1) ◽  
pp. 253-262
Author(s):  
Liu Zhongfu ◽  
Zhang Junxing ◽  
Shi Lixin ◽  
Yang Yaning
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Neutral Point ◽  
Arc Suppression Coil ◽  
Zero Sequence ◽  
Harmonic Extraction ◽  
Power Direction ◽  
The Stability

As for the wide application of arc suppression coil to the grounding in neutral point of mine high voltage grid, grid leakage fault rules and harmonic characteristics of the neutral point grounding system through arc suppression coil are analyzed, the selective leakage protection program “zero-sequence voltage starts, fifth harmonics of grid zerosequence voltage and zero-sequence current are extracted for phase comparison” is proposed, and corresponding fifth harmonic extraction circuit and power direction discrimination circuit are designed. The experimental results show that the protective principle applies not only to the neutral point insulated power supply system, but also to the power supply system in which neutral point passes arc suppression coil, which can solve selective leakage protection problems under different neutral grounding ways, improving the reliability of selective leakage and guaranteeing the stability of the action value.

Design and Implementation of Mid-Frequency Magnetron Sputtering Power Supply Based on TL494 and MCU

2013 ◽  
Vol 709 ◽  
pp. 408-412
Author(s):  
Yan Ling Zhao ◽  
Rong Xing Liu
Keyword(s):  
Magnetron Sputtering ◽  
Power Supply ◽  
Current Mode ◽  
Voltage Regulation ◽  
Control Circuit ◽  
Constant Current ◽  
Loop Control ◽  
Pulse Width Modulator ◽  
Digital Pulse ◽  
The Stability

Abstract. A mid-frequency magnetron sputtering (MFMS) power supply based on TL494 and MCU was introduced. A Buck Chopper and full bridge inverter were applied to the main circuit. The PWM controller TL494 was used in the Buck voltage-regulation control circuit to realize closed loop control. The drive signal of the IGBT in full bridge inverter was based on precise digital pulse width modulator (DPWM) signal produced by the MCU M30290. The DPWM can be set by potentiometer so the power supply can output the square wave with adjustable frequency and duty cycle. The power supply was operated in constant current mode. For micro or strong arcing of the target, different safeguards were adopted by the control circuit. At last, the system test and experimental results show that the stability, reliability and tuning range of the MFMS power supply can meet the requirements of the magnetron sputtering coating.

A 1 kW 500 kHz front-end converter for a distributed power supply system

1991 ◽  
Vol 6 (3) ◽  
pp. 398-407 ◽  
Author(s):  
L.H. Mweene ◽  
C.A. Wright ◽  
M.F. Schlecht
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Distributed Power ◽  
Front End

Numerical Simulation on Rupture Behavior and Selection of Safety Membranes

2014 ◽  
Author(s):  
Chen Sheng ◽  
Zhang Jian ◽  
Xiaodong Yu
Keyword(s):  
Present Theory ◽  
Large Fluctuation ◽  
Surge Tank ◽  
Small Hydropower ◽  
Weak Points ◽  
Maximum Water ◽  
Safety Operation ◽  
Hydropower Stations ◽  
Selection Of ◽  
Rupture Behavior

This present study deals with a new mechanical device consisting of a set of safety membranes, which has been successfully applied in several middle and small hydropower stations in China instead of a surge tank. Safety membranes are installed on the penstock near the powerhouse as controlled weak points. When the pressure caused by load rejection rises to the preset explosive value, one or more membranes rupture, protecting the penstock and the unit from damage. The device is simple, reliable and economical. The method of characteristics is employed to establish numerical model of safety membranes to simulate their rupture behavior, which is then introduced to investigate how to determine the number and diameter of membranes from two aspects, large fluctuation and hydraulic disturbance. The results show that the diameter of the membranes depends on the negative pressure along pipeline under hydraulic disturbance while the number of the membrane depends on the maximum water hammer pressure under large fluctuation during load rejection of the unit. The conclusion of membrane selection can perfect the present theory of safety membranes, and provide the theoretical guidance and practical basis for membrane device design and safety operation.

Design of Electrostatic Precipitator Power System Based on Auto Disturbance Rejection Controller

2013 ◽  
Vol 846-847 ◽  
pp. 190-194
Author(s):  
Shu Jun Yin ◽  
Xue Ren Li ◽  
Ji Geng Luo
Keyword(s):  
Power Supply ◽  
Disturbance Rejection ◽  
Power Supply System ◽  
Electrostatic Precipitator ◽  
Supply System ◽  
System Stability ◽  
Engineering Practice ◽  
Single Chip ◽  
High Voltage Power Supply ◽  
The Stability

The paper designs a three-phase high voltage power supply system based on active disturbance rejection controller which make single-chip microcomputer ATmega128 as the main control chip and the system improve the stability and control precision of dust removing power. Engineering practice shows that, the DC power supply system has the advantages of convenient operation, high work efficiency, system stability.

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