Engineering Posts

  Let applied voltage in the circuit is v(t)=VmSin(wt). Then current i(t) will flow in the circuit as shown in figure.  R is the resistance of the circuit.  Assume vR(t) is the voltage drop across resistor. According to Ohm's law, vR(t)=R*i(t)                                               i(t)=v(t)/R                    (since vR(t)=v(t))

  Nodal Analysis 1. Nodal analysis can be applied for the planner and non-planner networks 2. Nodal  analysis is based on the application of KCL Note:  1. A principle node is a point where more than two branches are connected. 2. A simple node is a point where two branches are connected. The procedure of nodal analysis: Step 1:   Identify the total no. of principle nodes Step 2:   Assign voltages to each principle node and take one of the nodes as a reference node Step 3:   Develop KCL equations for each node(except for reference node) Step 4:   Solve the KCL equations to get node voltages A special case of nodal analysis(Supernode) A supernode exists in a circuit when two non-reference nodes separated by a pure voltage source The procedure of super nodal analysis: Step 1:   Identify the total no. of principle nodes Step 2:   Assign voltages to each principle node and take one of the nodes as a reference node Step 3:   If super node found, then develop KCL equation for supernode and re

  Mesh Analysis Ø  A mesh is loop which doesn't contain any inner loop Ø  Mesh analysis is only applicable to planner networks Procedure of mesh analysis: Step 1:   Identify the total no. of meshes Step 2:   Assign the mesh currents to each mesh either in anti clock wise or clock wise direction Step 3:   Develop KVL equations for each mesh Step 4:   Solve the KVL equations to get mesh currents Special case of mesh analysis(Super mesh) A super mesh exists in a circuit when two meshes separated by the common current source branch Procedure of super mesh analysis: Step 1:   Identify the total no. of meshes Step 2:   Assign the mesh currents to each mesh either in anti clock wise or clock wise direction Step 3:   If super mesh found, then develop KVL equation for super mesh Step 4:   Develop KCL equation at common current source node. Step 5:   Solve KVL and KCL equations to get mesh currents

Power System Stability Need for power system stability  What is stability  Different types of stability  Steady-state stability  Transient stability Dynamic stability Classification of stability Development in the field of power systems: Synchrophasor  Smart grid  Renewable energy resource  Facts Plug-in hybrid electric vehicle Flexible Ac transmission system: Facts is power electronic-based system and other static equipment that provide controllability of power flow and voltage Control of power flow in ac system is necessary   FACTS segregated into Variable impedance type   Voltage source converter type Types of fact devices:    

 

 

 

 

 

 

https://link.springer.com/article/10.1007/s12555-017-0362-1