New Approach of Calculation the Steady State Symmetrical Fault Current for Type 4 Wind Power Plants

2020 ◽  
Vol 48 ◽  
pp. 162-178
Author(s):  
Abdelazeem H. Shehata ◽  
Amgad A. El-Deib ◽  
Zeinab H. Osman
Keyword(s):  
Steady State ◽  
Wind Turbines ◽  
Power Plants ◽  
Distribution Systems ◽  
Short Circuit ◽  
Voltage Source ◽  
Generic Model ◽  
Fault Current ◽  
Percentage Difference ◽  
Simulator Program

With the increasing penetration of the distributed generation driven by renewable energy in distribution systems, there is a need to analysis fault currents for the next generation utility and smart grid systems. The steady state fault current contribution from Type 4 wind turbines is not calculated accurately by traditional short circuit analysis techniques. A new formulation for calculating the short circuit current sharing from voltage source converter wind turbines is presented, and taken into consideration the real behaviour of the type 4 WT during three phase short circuit in the electric system. The results are compared with that obtained from the dynamic simulation results using Power World Simulator program, which has the generation of Western Electricity Coordinating Council (WECC) generic model. The percentage difference between the two results is about one percent that verify the effectiveness of the proposed formulation

scholarly journals Modelling Types 1 and 2 Wind Turbines Based on IEC 61400-27-1: Transient Response under Voltage Dips

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4078 ◽  
Author(s):  
Tania García-Sánchez ◽  
Irene Muñoz-Benavente ◽  
Emilio Gómez-Lázaro ◽  
Ana Fernández-Guillamón
Keyword(s):  
Wind Turbine ◽  
Wind Power ◽  
Wind Turbines ◽  
Distribution System ◽  
Power Plants ◽  
Short Circuit ◽  
Energy Resource ◽  
Weather Conditions ◽  
International Electrotechnical Commission ◽  
Voltage Dips

Wind power plants depend greatly on weather conditions, thus being considered intermittent, uncertain and non-dispatchable. Due to the massive integration of this energy resource in the recent decades, it is important that transmission and distribution system operators are able to model their electrical behaviour in terms of steady-state power flow, transient dynamic stability, and short-circuit currents. Consequently, in 2015, the International Electrotechnical Commission published Standard IEC 61400-27-1, which includes generic models for wind power generation in order to estimate the electrical characteristics of wind turbines at the connection point. This paper presents, describes and details the models for wind turbine topologies Types 1 and 2 following IEC 61400-27-1 for electrical simulation purposes, including the values for the parameters for the different subsystems. A hardware-in-the-loop combined with a real-time simulator is also used to analyse the response of such wind turbine topologies under voltage dips. The evolution of active and reactive powers is discussed, together with the wind turbine rotor and generator rotational speeds.

scholarly journals KOORDINASI SISTEM PROTEKSI TRAFO DISTRIBUSI 20 KV (STUDI LAPANGAN PT. PLN PERSERO UNIT LAMONGAN)

2020 ◽  
Vol 12 (1) ◽  
pp. 41
Author(s):  
Rohmat Syaifuddin ◽  
Zainal Abidin ◽  
Affan Bachri
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
System Analysis ◽  
Short Circuit ◽  
Good Condition ◽  
Suitable Condition ◽  
Fault Current ◽  
The Difference ◽  
System Calculation ◽  
The Right

Electricity distribution systems that use aerial or ground wires often experience various disturbances. Disturbances that often occur are symmetry disturbances or asymmetric disturbances which can be in the form of a short circuit of one phase to the ground, between phases or the breakup of one or more. To determine the magnitude of the fault current is needed transformer distribution system analysis to determine the disturbances that will occur. The transformer which is the main equipment in a GI must be considered to get the right current and safety circuit. Designing an appropriate transformer setting is an effort to protect equipment, systems and consumer needs from interference that may occur in the distribution system. Calculation of the fault current and the magnitude of the transformer nominal current will be used as an important reference in determining the transformer setting in the distribution of voltage to consumers. From the results of these calculations, it can be concluded that the relay feeder performance time is slower than the relay time in the calculation. The data in the field is still in a suitable condition (the difference is not too far away), so that the overall OCR - GFR settings in the field are still in good condition.

Effect of Renewable Distributed Generators on the Fault Current Level of the Power Distribution Systems

2012 ◽  
Vol 622-623 ◽  
pp. 1882-1886
Author(s):  
Hadi Zayandehroodi ◽  
Azah Mohamed ◽  
Hussain Shareef ◽  
Masoud Farhoodnea ◽  
Marjan Mohammadjafari
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Short Circuit ◽  
Power Source ◽  
Current Level ◽  
Fault Current ◽  
Power Distribution Systems ◽  
Distributed Generator ◽  
Distributed Generators

The presence of renewable distributed generator (RDG) in a distribution system will have unfavorable impact on the operating system because the distribution system is no longer radial in nature and is not supplied by a single main power source. With RDGs in a distribution network, it brings about a change in the fault current level of the system and causes many problems in the protection system, such as false tripping of protective devices, protection blinding, an increase and decrease in short-circuit levels. This paper presents the effect of RDGs on the fault current level of the system. The operating protection issues particularly in cases where RDGs are added to a LV distribution feeder are also discussed.

Comparison between Types of Generation for Wind Turbines Operating in Stochastic Wind

2002 ◽  
Vol 26 (6) ◽  
pp. 411-422
Author(s):  
F. D. Kanellos ◽  
N. D. Hatziargyriou
Keyword(s):  
Wind Turbines ◽  
Distribution System ◽  
Distribution Systems ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Variable Speed ◽  
Voltage Profile ◽  
Asynchronous Machines ◽  
Wind Potential ◽  
Doubly Fed

This paper analyses the repercussions from the connection of Wind Parks on the operation of weak electricity distribution systems, based on simulation results. Three different cases concerning Fixed Speed Wind Turbines are studied. Also Variable Speed Wind Turbines are examined, using (i), doubly-fed induction machines, and (ii), a dual voltage-source converter cascade. All these types of wind turbines are assumed to be equipped with asynchronous machines. The effects on the voltage profile caused by both Fixed and Variable Speed Wind Turbines are compared. The advantages of the variable speed operation are confirmed. The possible increase in the installed capacity of a Wind Park with variable speed turbines, as compared with fixed speed turbines maintaining the same power quality standards, is estimated. The distribution system studied is an actual feeder located in a rural area at the southeast of mainland Greece. This area presents excellent wind potential and as a result independent power producers have expressed a considerable interest for the installation of Wind Parks.

scholarly journals Universal Power Flow Algorithm for Bipolar Multi-Terminal VSC-HVDC

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1053
Author(s):  
Zhou Li ◽  
Yan He ◽  
Ting-Quan Zhang ◽  
Xiao-Ping Zhang
Keyword(s):  
Steady State ◽  
Power Flow ◽  
Control Strategies ◽  
Short Circuit ◽  
Operating Conditions ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Detailed Calculation ◽  
Negative Pole ◽  
Flow Algorithm

An effective and accurate power flow algorithm provides control references for active power dispatch and initial steady state operating points, used for stability analysis, short-circuit calculations, and electromagnetic transient simulations, which is not only a fundamental precondition to analyze the system operating conditions, but also the basis to improve the accuracy of power flow and DC voltage control of the multi-terminal voltage source converter-based high voltage direct current (VSC-HVDC). This paper proposes a nodal voltage-based universal steady-state power flow algorithm for the newly-developed bipolar multi-terminal VSC-HVDC (VSC-MTDC). Firstly, as the positive-pole and negative-pole DC network of the bipolar VSC-MTDC can be operated individually, a bipolar power flow alternating iterative method is proposed here to obtain the positive/negative-pole DC network power flow. Secondly, a series of nodal equivalent methods involving various control strategies are proposed for the universal power flow algorithm. Then the detailed calculation procedure and a general MATLAB(TM) program for the universal power flow algorithm is presented. A typical 4-terminal bipolar VSC-MTDC system was built in the PSCAD/EMTDC to verify the validity of the proposed algorithm, and the results are discussed here. Moreover, the calculation results of more complex bipolar VSC-MTDC systems under different operating conditions, employing the proposed universal power flow algorithm, are presented to illustrate its universality and efficiency.

Research on Characteristics of Stator and Rotor Fault Current of DFIG

2015 ◽  
Vol 1092-1093 ◽  
pp. 325-331
Author(s):  
Hong Bo Zhao ◽  
Wen Hui Shi ◽  
Hao Zha ◽  
Jing Wu
Keyword(s):  
Power System ◽  
Wind Turbines ◽  
Short Circuit ◽  
Transient Processes ◽  
Stable Operation ◽  
Fault Current ◽  
Electromagnetic Transient ◽  
Fault Ride Through ◽  
Three Phase ◽  
Current Characteristics

The abrupt dip of grid voltage would provoke a series of electromagnetic transient processes in stator and rotor of DFIG, which would threat the security of wind turbines fault ride through (LVRT) and stable operation of power system. Analyzing the fault current characteristics of DFIG is very useful to improve the LVRT strategy and adjust the relay protection setting of power system. In this paper, electromagnetic transient processes of DFIG are given a detail analysis after protection circuit of DFIG works due to the dip of three phase voltage in system. Then, the general expression of stator and rotor fault current is derived, and the validity of this method is verified. At last, the influences of the system short-circuit capacity and wind turbines accessing capacity on the fault current and system protections are analyzed when the wind turbines are accessed to the distribution network.

T Source Inverter Based Shunt Active Filter with LCL Passive Filter for the 415V 50 Hz Distribution systems

2015 ◽  
Vol 6 (2) ◽  
pp. 268
Author(s):  
S. Sellakumar ◽  
M. Vijayakumar
Keyword(s):  
Power System ◽  
Distribution Systems ◽  
Short Circuit ◽  
Current Source ◽  
Voltage Regulation ◽  
Active Filter ◽  
Active Filters ◽  
Voltage Source ◽  
Shunt Active Filter ◽  
Wide Range

The inverter topology is being used as an active filter to reduce the harmonics in the power system. The traditional voltage source or current source inverters are having the disadvantages of limited output voltage range hence it may not be able to supply enough compensating currents during heavy switching surges, Vulnerable to EMI noise and the devices gets damaged in either open or short circuit conditions and the main switching device of VSI and CSI are not interchangeable. The active filters are the type of DC-AC system with wide range of voltage regulation and integration of energy storages is often required. This cannot be achieved with conventional inverters and hence the impedance source inverters have been suggested. The T source inverters are basically impedance source inverters which can be used as an active filter in the power system. The MATLAB simulation is done and the results are discussed in this paper for both the types. The proposed dampening system is fully characterized by LCL based passive filters and T source inverter based shunt active filter. The disturbances in the supply voltage and load current due to the non linear loads are observed in the simulation. The same is studied after connecting the designed hybrid shunt active filter in the distribution system. The simulation results obtained from the proposed method proves that it gives comparatively better THD value.

Sign in / Sign up

Export Citation Format

Share Document