Offshore flexible straight bridge arm valve tower and alternating current bus same-hall arrangement structure and method

The offshore flexible straight bridge arm valve tower and alternating current bus same-hall arrangement structure comprises a main valve hall, a first valve area and a second valve area which are arranged in a communicating mode are arranged in the main valve hall, an upper bridge arm valve tower set is arranged in the first valve area, and a lower bridge arm valve tower set is arranged in the second valve area. The upper bridge arm valve tower group and the lower bridge arm valve tower group respectively comprise low-pressure valve towers and high-pressure valve towers which are the same in number, each valve tower group is internally provided with three phases, each phase comprises one low-pressure valve tower and one high-pressure valve tower, the upper bridge arm valve tower and the lower bridge arm valve tower are respectively provided with an incoming line and an outgoing line, the low-pressure valve towers are connected with the incoming lines, and the high-pressure valve towers are connected with the