AGC study of a hydrothermal system with SMES and TCPS

Abstract

SUMMARYFrequency deviations and inter-area tie-power fluctuations from their respective scheduled values following a local load disturbance are a source of great concern in interconnected power system operation and control. In this paper, a new method is proposed to minimise such deviations and thereby enhance the performance of Automatic Generation Control (AGC) of an interconnected hydrothermal power system with the coordinated operation of a Superconducting Magnetic Energy Storage (SMES) unit in thermal area and a Thyristor Controlled Phase Shifter (TCPS) in series with the tie-line. Generation Rate Constraints (GRCs) are also considered for the thermal and hydro systems. The integral controller gain settings are obtained by optimising a quadratic performance index using the Integral Squared Error technique. Comparison of the dynamic responses demonstrates the effectiveness and efficiency of the suggested SMES-TCPS combination in suppressing and stabilising the oscillations of frequency and tie-power deviations as well as in reducing the settling time.

Effective oscillation damping of an interconnected multi-source power system with automatic generation control and TCSC

“…1 is considered for both raising and falling rates. For the hydro unit, typical GRC of 270% per minute for raising generation and 360% per minute for falling generation are considered [1,3,28].…”

“…In [2], AGC of a two-area interconnected non-reheat thermal-thermal power system is studied with and without coordinated control of SMES and TCPS. In [3], to improve the dynamic performance of AGC of an interconnected hydro-thermal power system, coordinated design of SMES and TCPS is proposed. In [4], the analysis of AGC of a two-area interconnected power system under open market scenario in the presence of TCPS is investigated.…”

“…Various FACTS controllers can be applied in series with tie-line of interconnected power systems to control power flow and to damp the inter-area oscillations via designing a supplementary controller. Due to quick dynamic responses, series FACTS devices such as thyristor controlled phase shifter (TCPS) [1][2][3][4][5][6][7][8], static synchronous series compensator (SSSC) [7,9], and interline power flow controller (IPFC) [10,11] have been employed in power system to attenuate the area frequency and tie-line power oscillations. Energy storage devices based on FACTS such as superconducting magnetic energy storage (SMES) [2,3,5,7], capacitive energy storage (CES) [1], and redox flow batteries (RFB) [6,10,11] can compensate the sudden load perturbations by injecting or absorbing the active power to the system and thereby stabilize the oscillations.…”

Multi-Area Frequency and Tie-Line Power Flow Control by Fuzzy Gain Scheduled SMES

“…The converter is of the 12-pulse cascaded bridge type shown in Fig. 2, connected to the inductor in the DC side and to the three-phase power system bus through the transformer in the ac side [R.J. Abraham et al, 2008]. allow us to design such type of converter.…”

Load Frequency Control for Two-area Multi-Source Interconnected Power System using Intelligent Controllers

“…Generally, for hydro units' generation rate is 270% per minute for raising generation and 360% per minute for lowering generation, thermal have the order of 3% per minute. The dynamic transfer function model of reheat thermal units and hydro units have discussed by many authors [18][19][20][21]. The wind units normally do not participate in load frequency control.…”