Development of optimal shunt hybrid compensator based on improving the measurement of various signals

• Development of hybrid compensator based on STATCOM and SVC.
• A predictive method is proposed to estimate the reactive power to omit time delay.
• To predict the reactive power, the ARMA time series and RLS algorithm proposed.
• A method is presented to measure the TCR reactive power.
• A new DC voltage link based on FPSO is suggested to replace with PI controller.

Voltage and current harmonics generated by nonlinear loads in power systems cause a reduction in electric power quality (EPQ) which has recently become a serious preoccupation in electrical networks due to the increasing number of perturbing loads such as electric arc furnaces and nonlinear loads. Various devices such as static Var compensator (SVC) and static synchronous compensator (STATCOM) can be used to improve EPQ. Due to economic issues, using a STATCOM with high-rated power is not cost-effective. So, development of hybrid compensator based on STATCOM and SVC, type of TCR-BPF, is proposed in this paper by improving the measurement of various signals in their control systems. Hence, the SVC will compensate the fundamental reactive power and balancing of nonlinear load and STATCOM can be used with lower-rated power as an active filter to eliminate the harmonics generated by set of TCR and load. Also, STATCOM compensates the reactive power, voltage flicker, and the unbalancing load which SVC has not been able to compensate them. To use all of the capabilities of TCR-BFP, its control system is improved by new TCR reactive power measurement and predicted reactive power (PRP). Also, the STATCOM control strategy is optimized by FPSO method. Then, the proposed hybrid compensator is implemented in one of the largest steel industries in Iran, Mobarakeh Steel Company (MSC).