For the purpose of the effective use of the power facilities, the control strategy for the leveling of the active power and the compensation of the reactive power is proposed based on the fuzzy logic using small capacity of the superconducting magnetic energy storage (SMES) equipped near to the consumer. The varidity of the proposed control strategy is clarified by the simulation. The summary in this paper is as follows.(1) In the approximate reasoning, the rule for the current flowing into the SMES is added to the rules for the leveling of the active power and the energy stored in the SMES which are applied in the previous paper. Then, only PB is adopted to the membership function for this rule because of the function of the current limit.(2) The variance of the controlled results to the sustained component is indicated in the three-dimensional expression. Then, the range of the stalling factor is shown for the good controlled results of leveling the active power.(3) The controllable range in which the power control can be achieved in accordance with the power demand expands comparing with that in the previous paper.(4) The variance of the controlled results to the sustained component becomes smaller than that in the previous paper. It is clarified that the proposed control strategy can level the fluctuating load power better.
Abstrmt-Leveling of load power fluctuations and compensation of reactive power can be achieved by a superconducting magnetic energy storage (SMES) installed close to the consumer end in a power system. This reduces transmission losses and lowers the required ratings of equipment in the power system while improving power system stability. An SMES simulator based on power electronics technology, i.e. a power converter, is proposed. An experiment to level load power fluctuations with the SMES simulator is put into practice to verify the proposed fuzzy control strategy. Experimental results agree well with simulation results. Estimating indexes show that ratings and power loss are half of those without the SMES power control system. The presented power control system based on fuzzy control strategy is proved useful for leveling load power fluctuations.
The control strategy based on fuzzy logic is proposed for levelling the load power fluctuation and compensating the reactive power by using the superconducting magnetic energy storage (SMES) equipped near to the consumer. Then, its control effects are discussed by simulation. The obtained results are summarized as follows.(1)The conditions with respect to the levelling of the active power in the source line and the energy stored in the SMES are introduced. Then, the production rules on these conditions are constructed.(2) The estimation value LD of levelling the active power in the source line is proposed in addition to the estimation value v of following the sustained component.Provided that the base of the triangle in the menbership function is set to 1.05 for the load power fluctuation investigated, the most preferable result can be obtained when the heights of triange are 0.01 and 0.6 in the rule 1 and the rule 2, respectively.(4) Comparing with the control results by using the estimation function, the estimation value v with the fuzzy control is less than that with the estimation function regardless of the capacity of the SMES. Therefore, it is clarified that the levelling of load power fluctuation can be achieved by the fuzzy control better than by the estimation function.
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