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Comprehensive Analysis of Contingency Algorithms in Power Systems

This technical seminar report explores the importance of contingency analysis in electric power systems, focusing on DC power flow methods, Z matrix method, and post-contingency equilibrium analysis for system stability and decision support.

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Comprehensive Analysis of Contingency Algorithms in Power Systems

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  1. Technical Seminar Report On “CONTINGENCY ANALYSIS” under the guidance of Mr. Debasis Jena submitted by SIGMA DASH EE200198046

  2. INTRODUCTION • Simulator that evaluates, provides and prioritizes the impacts on an electric power system • AC power flow method is expensive, computationallyand time taking. • DC power flow equations and bus voltage equations • Deterministic contingency analysis • The algo in CA uses network parameters to model, calculate & simulate the effects of removing equipment from the power system.

  3. DC POWER FLOW METHOD • N-1 in number, only the real power flow , all line resistances are neglected • Line resistance is neglectedso Y ij= Gij + jBij = jBij

  4. must be sufficiently small Ultimately, or in matrix form P = K If Phas to be constant, K &  will change from base values This provides the changes in the bus voltage angles  = - (K0)-1 Ks

  5. To study single contingencies, we use  Kpp= Kpq Kqq = Kpq  Kpq = - Kpq  Kqp= - Kqp Substituting these we get the matrix as = - (K0)-1 ( psKp+  psKq) pq Changes in line flows due to the loss of line pq given are obtained by substituting the appropriate elements ofpq

  6. Z MATRIX METHOD • Methods include inverting Y bus matrix and injecting a fictitious current into the bus • Converting the MVA loads to impedance loads using • Zload i = • Injecting a unit current, into the bus p which has to be removed =

  7. Ipqcan be calculated using the equation • An adjustment parameter, d, has to be used • Due to the injection lp = d, the new current in other elements Ipq where ij is not equal to mn

  8. The sought-after current flow changes due to removing line pq are for all ij • Calculating the current flow pattern in the modified network, in which line pq has been removed, requires only that we inject current I p=d, as before, into the modified network. • The voltages are =

  9. POST CONTINGENCY EQUILLIBRIUM Methods to compute the equilibrium condition immediately following a disturbance to an electric power system • Analysis by Integration • Analysis by Simultaneous Iteration • Analysis by partitioned iteration

  10. CONCLUSION • Methods for evaluating both isolated and interconnectedareas • Used as an online decision support tool • Faster approximate methods for locating potential trouble spots

  11. THANK YOU !

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