NOVELTY - A fuel synthesis system comprises methanol reactor trains operated in parallel from supply input of synthesis gas (syngas) from solar driven chemical reactor and/or syngas from storage unit. The trains are idled as needed, based on variable amount of syngas fed into the process. A controller controls operation of trains by idling train(s), altering output amount generated by train(s), and/or switching train(s) to operational state, based on amount of syngas generated by reactor, which is subject to marked variations in volume of syngas output based on seasonal, diurnal and weather effects.    USE - Fuel synthesis system used for refining biomass and other materials.    ADVANTAGE - The system enables cyclic operation of fuel synthesis process.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a control system for fuel synthesis system, comprising control algorithms on reactor operation, in which the control algorithms specifically allow rapid and efficient reactor cycling by using syngas from solar driven chemical reactor and syngas from a storage unit, and recycling syngas and methanol product gas from an outlet of reactor trains to keep at least one of the trains operating at some percent of its maximum throughput; and the control system keeps an idle reactor at or near reaction temperature with a pressure change of less than or equal to 30% during the idle periods; and    (2) a method for integrated solar driven chemical plant, including conducting chemical reaction in solar driven chemical reactor having reactor tubes using concentrated solar energy to drive conversion of chemical reactant, in which endothermic chemical reaction conducted in the reactor tubes includes biomass gasification, steam methane reforming, methane cracking, and/or using solar thermal energy from concentrated solar energy field; supplying chemical reaction products for catalytic conversion of products into hydrocarbon fuel or other chemical in chemical synthesis plant, in which operation of chemical synthesis plant is dependent on amount of product generated in solar driven chemical reactor; and designing a control system for chemical synthesis plant to send control signals to and receive feedback from a control system for chemical reactor, in which the control system for chemical reactor indicates the amount of product generated in solar driven chemical reactor.    DESCRIPTION OF DRAWING(S) - The drawing is a diagram of multilevel compressor system strategy.