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Generation connected to the transmission system via inverters (electronically coupled generation) is a growing. Utility protection engineers conventionally use impedance matrix algorithms to determine fault current magnitudes and angles, perform coordination studies, and guide relay settings. In transmission protection studies, it has thus far been common practice to exclude the fault current contributions...
This paper discusses subsynchronous phenomena as related to wind turbine generators in the vicinity of series compensated transmission systems. Brief discussions of the applicable terminology, the phenomena that can be experienced by different wind turbine types, possible evaluation methods and potential mitigation options are presented.
Increased integration of wind power makes higher demands on the stability and protection of Power System. Wind farms are connected to power grid through transmission line. When single-phase fault occurs on the line, positive and negative sequence currents are not equal and are much smaller than zero sequence current. Phase selector based on the theory of current- difference sudden-change may mistake...
High penetration of wind power is hindered by the variability and uncontrollability of wind power output. Many research publications already proposed solutions using energy storage devices. However due to capital and maintenance cost, real applications of energy storage are limited. Wind turbines employing wound rotor induction generators where either rotor resistance is controlled or a voltage is...
Larger percentages of wind power penetration translate to more demanding requirements from grid codes. Recently, voltage support at the point of connection has been introduced by several grid codes from around the world, thus, making it important to analyze this control when applied to wind power plants. This paper addresses the analysis of two different voltage control strategies for a wind power...
This paper presents the impact of different types of load models in distribution network with distributed wind generation. The analysis is carried out for a test distribution system representative of the Kumamoto area in Japan. Firstly, this paper provides static analysis showing the impact of static load on distribution system. Then, it investigates the effects of static as well as composite load...
Renewable sources of electrical energy (especially the wind power generators), which have been lately promoted, are causing problems in distribution and transmission operation networks.
With the development of wind power on a large scale, more and more wind sources will be integrated into power grid. However, due to intermittent nature, power grid dispatch will face new difficulties. It is necessary for us to analyze wind power systems and locate the specific points of power loss. This is of great significance to timely adjust the output of the remaining units to keep the balance...
Increased awareness of environmental concerns has caused greater interest in developing power sources based on renewable technologies, such as wind. Due to the intermittent nature of the wind speed, output voltage and frequency of the direct driven permanent magnet synchronous generators (PMSG) are normally unsteady. Recently proposed Z-source inverter has been considered as a potential solution for...
With the continued expansion of the scale of wind power generation, the power quality problems due to grid connected wind farms are concerned widely. The voltage fluctuation and flicker and harmonics are main aspects of power quality problems. The fluctuation of wind farm output and grid voltage due to the random fluctuation of wind speed and inherent characteristics of wind turbines may cause flicker...
The connection of wind power plant changes the short-circuit current in distribution network. Protections now used must be adjusted and changed to ensure correct fault clearing with right method, and maintain the safe and stable operation of the system. Based on the short circuit current calculation and analysis after the wind farm connected to distribution network, the adaptive instantaneous protection...
In a power system with significant wind power penetration, the tripping of wind turbines for a system fault condition can be a major concern to the system operator. With wind turbines employing different under-voltage protection settings available in the system, a fault on a transmission line can lead to tripping of a large number of wind farms depending on the voltages at the wind farm buses during...
A Z-source inverter based grid-interface for a variable-speed wind turbine connected to a permanent magnet synchronous generator is proposed. A control system is designed to harvest maximum wind energy under varied wind conditions with the use of the permanent magnet synchronous generator, diode-rectifier and Z-source inverter. Control systems for speed regulation of the generator and for DC- and...
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