Abstruct-This paper presents a new multilevel converter topology suitable for very high voltage applications, especially network interties in power generation and transmission. The fundamental concept and the applied control scheme is introduced. Simulation results of a 36MW-network intertie illustrate the efficient operating characteristics. A suitable structure of the converter-control is proposed.

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A new ac/ac modular multilevel converter (M 2 LC) family will be introduced. The new concept stands out due to its modularity and superior control characteristics.The stringent modularity results in a very cost-efficient and versatile converter construction. This new M 2 LC concept is well suited to a wide range of multiphase ac/ac converters. The basic working principle together with the static and dynamic behavior are explained in detail on a single-phase ac/ac converter enabling four-quadrant operation.It is demonstrated that this converter concept fulfils the demanding requirements for future ac-fed traction vehicles very well.

Demanding future applications in power transmission and drives -like solar-thermic power plants and off-shore wind power -require advanced converter systems. Modular Multilevel Converters are well adopted to these needs, owing to industrial scalability, high efficiency and fast dynamic controllability under transient and fault conditions -including DC-Side faults. The respective features of the established concepts for the high power range (M2C) and of new concepts for the low power range (MHF) are explained.