As the increasing utilization of wind resources and lightweight gas turbine units, the power grid is shifting towards a situation with declining system inertia, which causes a larger frequency deviation after disturbances and threatens the reliability of the grid. Thus, we devote this work to develop an appropriate tool to determine the economic value of the inertia to the systems. To do so, we discretize and integrate the system dynamic equations into a modified version of the linear security-constrained unit commitment framework. Since the fast-acting storage devices are able to respond in a very short time, we also develop a storage control scheme to mimic the inertia and to provide primary frequency responses. We perform extensive studies on the IEEE 24-bus reliability test system and present some illustrative simulation results to demonstrate the effectiveness of the proposed method to assess the economic value of the power system inertia.

10aRM15-0021 aXu, Ti1 aJang, Wonhyeok1 aOverbye, Thomas, J. uhttps://certs.lbl.gov/publications/economic-evaluation-tool-inertia01367nas a2200181 4500008003900000245010000039210006900139260002900208520068100237653001000918653002800928653001300956653001300969100001900982700002201001700002401023856013801047 2015 d00aTowards a Transmission Line Limit Preserving Algorithm for Large-Scale Power System Equivalents0 aTowards a Transmission Line Limit Preserving Algorithm for Large aKauai, HIbIEEEc01/20153 aPower system equivalents have long been used for reducing the size of power systems networks. While there are a number of equivalencing methods, little attention has been paid on how to retain thermal line limits from the original system. This paper presents an approach to develop an equivalent network for a large scale power system that preserves the thermal line limits from the equivalenced lines. The proposed method is able to assign limits to equivalent lines with inexpensive computation and is operating point independent even with a loaded system. The algorithm is applied to create a backbone type equivalent system of the Eastern Interconnection in North America.10aCERTS10areliability and markets10aRM11-00110aSuperOPF1 aJang, Wonhyeok1 aMohapatra, Saurav1 aOverbye, Thomas, J. uhttp://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7070147&refinements%3D4256109463%26filter%3DAND%28p_IS_Number%3A7069647%2901531nas a2200241 4500008003900000022001400039245007500053210006900128260001100197300001600208490000700224520080300231653001001034653002401044653002901068653002801097653001301125653001301138100002201151700001901173700002401192856007301216 2014 d a0885-895000aEquivalent Line Limit Calculation for Power System Equivalent Networks0 aEquivalent Line Limit Calculation for Power System Equivalent Ne c9/2014 a2338 - 23460 v293 aThis paper focuses on the relatively unexplored subject of creating limit-preserving equivalents (LPEs). There is a push to develop LPEs for power system interconnections to be used in markets and reliability studies. The equivalents that exist for these interconnections do not capture thermal limits of equivalent lines, which results in their transmission limits being significantly different from the original interconnection limits. Assigning noninfinite and nonzero limits to equivalent lines is the niche of this paper. This is done by considering an unloaded network, which is operating point independent. A solution method is developed and discussed, which is capable of assigning lower, best, and upper estimates for equivalent line limits and is proposed for use towards developing LPEs.10aCERTS10aelectricity markets10apower system reliability10areliability and markets10aRM11-00110aSuperOPF1 aMohapatra, Saurav1 aJang, Wonhyeok1 aOverbye, Thomas, J. uhttps://certs.lbl.gov/publications/equivalent-line-limit-calculation01388nas a2200229 4500008003900000020002200039245005000061210005000111260003300161300001400194520070300208653001000911653001800921653002800939653001300967653002600980100001901006700002201025700002401047700001301071856007401084 2013 d a978-1-4673-5601-500aLine limit preserving power system equivalent0 aLine limit preserving power system equivalent aChampaign, ILbIEEEc02/2013 a206 - 2123 aA reduced order equivalent of a power system is a simplified model of the original system with the ability to preserve some key characteristics and to provide adequate fidelity in simulation studies with considerably reduced computational requirements. In this paper, an algorithm to construct an equivalent system with the ability to retain thermal line limits is presented. The application of Kron's reduction and power transfer distribution factor is used in the creation of the reduced system. The criteria for this method and its step-by-step procedure with the implementation to a small power system are described. Also, the result of its application to the IEEE 118 bus system is provided. 10aCERTS10apower systems10areliability and markets10aRM11-00110atransmission networks1 aJang, Wonhyeok1 aMohapatra, Saurav1 aOverbye, Thomas, J.1 aZhu, Hao uhttps://certs.lbl.gov/publications/line-limit-preserving-power-system