![]() Section 2 gives a comprehensive review and brief introduction of STATCOM and battery, applications as well as financial aspects. The final results show that the addition of energy storage allows the STATCOM to inject and/or absorb active and reactive power simultaneously and, therefore, provides additional benefits and improvements in the system. The analysis is then extended by adding an energy storage device (battery) to the STATCOM. ![]() The results are then compared with STATCOM placed in the system. The model is implemented in MATLAB/Simulink and computer simulation results under different fault (3-phase to ground fault) clearing times are analyzed for transient stability. For simplification purpose the classical model of a generator is assumed with an infinite bus as a constant voltage source. For test cases, a power transmission system with a single machine generator connected to an infinite bus is considered. Next section provides review in greater details and Sections 3– 5 provide application demonstration of STATCOM + BESS. In this paper, review and application of using STATCOM in network with BESS are presented. STATCOM connected to a transmission line. This is completely analogous to increasing or decreasing the field voltage of a synchronous compensator. If the voltage of the DC capacitor bank is decreased below the nominal value, the STATCOM is “under excited” (inductive mode) and absorbs reactive power from the system. In Figure 1, which shows the single line diagram of a STATCOM, if the DC capacitor voltage,, is increased from its nominal value, the STATCOM is “overexcited” (capacitive mode) and generates reactive power. This is achieved by increasing (decreasing) the power transfer capability when the machine angle increases (decreases). ![]() The ultimate objective of applying reactive shunt compensation in a transmission system is to increase the transmittable power during transients. This combined system is capable of mitigating majority of the stability and voltage fluctuation problems in the power system as discussed in detail in Section 2, with comprehensive literature review.Ī STATCOM, connected in shunt, with the system is capable of improving transient stability by compensating the reactive power at the point of common connection. Some of the advantages of battery technologies are of higher energy storage densities, greater cycling capabilities, better reliability, and lower cost. In practice, by integrating an ESS with STATCOM (STATCOM + ESS) significant improvements over traditional STATCOM performance are achievable. ![]() In Many research papers, it has been shown that an energy storage system (ESS) plays an important role in power system control. However, the system has a symmetric lead-lag capability and can theoretically go from full lag to full lead in fraction of cycles. When compared to synchronous machines, they do not contribute to short circuit currents and have no moving parts. STATCOMs behave analogously to synchronous compensators, except that STATCOMs have no mechanical inertia and are therefore capable of responding much more rapidly to changing system conditions. An additional benefit is the reduction of the demagnetizing effects of faults on local generation. In particular, the STATCOM may be used to enhance power transfer during low-voltage conditions, which typically predominate during faults, decreasing the acceleration of local generators. The principal benefit of the STATCOM for transient stability enhancement is direct through rapid bus voltage control. The final results show that the STATCOM reactive power/voltage control helps in transient stability enhancement. The study is aimed at showing that the combination of STATCOM and battery energy storage significantly improves the performance of the system. The dynamics of real and reactive power responses of the integrated system to transients is studied. In the second part of the paper, a typical transient stability model of a STATCOM is presented. ![]() A brief overview of the advantages of using STATCOM in conjunction to energy storage systems in achieving power system stability is presented. At the beginning of this paper, an overall review of the STATCOM and energy storage systems are elaborated. Application of STATCOM with storage in regard to intermittent renewable energy sources such as wind power generation is also discussed in the paper. This paper, however, pays particular importance to the performance improvement for the transients as is achievable by STATCOM with battery-powered storage systems. Significant research has been done in this area for practical realization of benefits of the integration. Integration of STATCOM with energy storage devices plays an imperative role in improving the power system operation and control. ![]()
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