Abstract Electric power router (EPR) is a core equipment in the energy internet and an important symbol of the next generation smart grid. Due to the limitation of topology architecture, the traditional region EPR (REPR) has the disadvantages of limited loading capacity and inability of flexible operation for the reactive power. To this end, this paper intends to build a new type of REPR with a series and parallel architecture (SPA-REPR). By adding a parallel energy flow path, it will break the double limits of the traditional EPR's 100% energy transmission and the reactive power rigid operation. The power flow flexible operation mechanism of SPA-REPR is analyzed, the calculation method of power flow in different operation modes is given, so that its operation law is clarified. To realize the active control for system's energy, a two-degree-of-freedom power flow flexible control strategy (TDF-PFFCS) is proposed to control the TDFs of the AC grid input current amplitude and output AC bus voltage phase angle, so as to flexibly match the active power between the AC grid and the DC bus and the reactive power between the series and parallel converters. As a result, without increasing the system capacity and AC input power distribution, the transmission targets of 200% active power and 120% reactive power can be achieved, which provides novel design ideas and solutions for EPRs to achieve high-power energy flexible transmission.
Zhao Xiaojun,Zhang Chunjiang,Chai Xiuhui等. Flexible Operation and Power Flow Control Strategies for Series-Parallel Architecture Region Electric Power Router[J]. Transactions of China Electrotechnical Society, 2021, 36(7): 1480-1491.
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2021, Vol. 36 
