This paper introduces a new approach for power flow control of interconnected AC-DC microgrids in grid-connected hybrid microgrids based on implementing a modified unified interphase power controller (UIPC). A typical grid-connected hybrid microgrid including one AC microgrid and one DC microgrid is considered as studied system. Instead of using the parallel-connected power converters, these microgrids are interconnected using a modified UIPC. As the first contribution of this paper, the conventional structure of UIPC, which uses three power converters in each phase, is modified so that a reduced number of power converters is implemented for power exchange control between AC-DC microgrids. The modified structure includes one power converter in each phase, named as line power converter (LPC), and a power converter which regulates the DC bus voltage, named as bus power converter (BPC) here. The AC microgrid is connected to the main grid through the LPCs which their DC buses are linked and can operate in capacitance mode (CM) or inductance mode (IM). A fuzzy logic controller is used in the control structure of the LPCs. The fuzzy inference system is optimized based on H∞ filtering method to reduce the errors in membership functions design. Through the BPC, the DC voltage of LPCs is supplied by the DC microgrid. However, since the DC microgrid voltage is provided here by a PV system, the DC link voltage of the LPCs is fluctuating. Thus, as the second contribution, to stabilize the DC link fluctuations, a new nonlinear disturbance observer based robust multiple-surface sliding mode control (NDO-MS-SMC) strategy is presented for DC side control of the BPC. The simulation results confirm the effectiveness of the proposed power flow control strategy of the improved UIPC for hybrid microgrids.

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Power Flow Control of Hybrid Micro-Grids Using Modified
UIPC
ABSTRACT:
This work introduces a replacement advent for power flow control of interconnected AC-DC
micro-grids in hybrid micro-grids connected to grids. It also supports implementing an Adaptive
Neuro Fuzzy Inference System (ANFIS) controlled modified Unified Inter-Phase Power
Controller (UIPC). For study, a classic hybrid micro-grid connected to grid comprising of a AC
micro-grid and a DC micro-grid is taken into account. These micro-grids are interconnected
employing a modified UIPC, rather than using the power converters connected in parallel. As the
first input of this paper is the standard structure of UIPC, which used three power converters in
every phase. It was then modified such as number of power converters is used less and
implemented for the control of the exchange of power between AC-DC microgrids. In every
phase there is one power electronic converter in the improved structure. It is called as Line
Power Converter (LPC). Also there is Bus Power Converter (BPC) to regulate the voltage of the
DC bus. The Line Power Converters links the AC micro-grid to the main grid. The DC buses are
also linked with them. It can be operated in Inductance Mode (IM) as well as Capacitance Mode
(CM). The control structure of LPCs has an Adaptive Fuzzy Logic Controller in it. For hybrid
micro-grids, the capability of the suggested power flow control strategy is confirmed by the
MATLAB simulation results.
KEYWORDS:
1. Ac micro-grid
2. Dc micro-grid
3. Grid control
4. Hybrid micro-grid

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5. UIPC
6. UPFC
SOFTWARE: MATLAB/SIMULINK
CONCLUSION:
The hybrid micro-grid structure is the favorable option in the future smart grids to gather
together the renewable resources for AC/DC loads. This is because of the fact that this structure
holds the merits of AC as well as DC micro-grids simultaneously. There is one conventional
problem with this structure. That is to efficiently control the exchange of power within
interconnected micro-grids comprising of AC and DC system. In this particular work, an ANFIS
controlled UIPC solution is suggested as a superior alternative to the power electronic converters
connected in parallel which have brought many problems. An improved design of the UIPC was
initially suggested and then effective strategies for control are presented for the modified UIPC.
The results of simulation are used to validate the modified model along with performance of the
control of power exchange between micro-grids having AC and DC system.
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http://ieeexplore.ieee.org/document/5546958/

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[4] JiaLihu, ‘‘Architecture Design for New AC-DC Hybrid Micro-grid”, DC Microgrids
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