Frequency converters and PV inverters are technologically closely related, sharing 80-90% of their components.
变频器和PV逆变器是与科技密切相关的产品，分享共用率为80 - 90%。
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A modified direct digital frequency synthesis (DDS), pipelined structure, and time-sharing ROM are adopted in the chip, for saving chip area and ensuring high performance and speed.
Then, by use of multiple carrier system's frequency-sharing property and convex optimization, a subcarrier and power optimal allocation algorithm is proposed based on Lagrangian duality theory.