Management of Power in AC/DC Hybrid Microgrid and its Harmonic Analysis by using D-STATCOM
In the present scenario, the increasing penetration of solar energy can be significant challenge due to the variation of power generation. One of the solution to improve the quality of power supply and guarantee of system stability is energy storage system (ESS). In this project, a AC-DC hybrid micro grid is designed based on photovoltaic (PV), generator and energy storage system are coordinated control is proposed to manage the power according to the load demand With D-STATCOM and without D- STATCOM. Moreover, AC-DC buses are interconnected by the bidirectional converters. The power control of the interlinked converters is enabled when the AC or DC sides suffer from the active power demand shortage. In particular, if the AC micro grid doesn’t satisfy the reactive power demand, then the distributed static synchronous compensator (D-STATCOM) is used for the compensation. A DC-DC Boost converter is connected to boost out the input voltage from the photovoltaic (PV)farm which is given to DC-bus. The system is tested with a different load i.e. inductive, pulse, non-linear load connected to the AC-side. The proposed topology is verified by doing simulation of MATLAB R2016b for management of power between two AC and DC sides under normal conditions and fault conditions with high efficiency, reliability and robustness in islanding mode.
- Hybrid micro grid
- PV system
HYBRID MICROGRID CONFIGURATIONS
Figure 1: A Hybrid AC/DC Microgrid system
Figure 2: A Hybrid AC/DC Microgrid system with D-STATCOM Controller
Figure 3: A Hybrid AC/DC Microgrid system with Three-phase fault
Figure 4: A Hybrid AC/DC Microgrid system with Three-phase fault and D-STATCOM
EFFECT OF DISCREPNCY OF LOADING CONDITIONS ON HYBRID MICROGRID
Variation of loading conditions without D-STATCOM
- No-Load condition grid output voltage and current
- Inductive load condition grid output voltage and current
Variation of loading conditions with D-STATCOM
- No-Load condition grid output voltage and current with D-STATCOM
- Inductive load condition grid output voltage and current with D-STATCOM
Variation of loading conditions with Three-phase fault
- No-Load condition grid output voltage and current with Three-phase fault
- Inductive load condition grid output voltage and current with Three-phase fault
RESULTS AND DISCUSSION
In this paper a coordination power flow between AC/DC and vice versa is proposed. The DC side voltage is boosting by using P&O algorithm in MPPT control. The percentage of harmonic distortion (THD) is calculated and observed that the average %THD value is drastically reduced from 118.07 to 8.875.The ac side voltage amplitude and frequency are regulated by bidirectional AC/DC inverters by considering different loading conditions. To satisfy the load demand, active and reactive power is compensated by taking a FACTS control device, STATCOM. It has been seen that when load demand increases the active power is decreasing and reactive power is increasing as shown in the Table 2. To compensate the power a STATCOM is connected on the AC side of the hybrid (AC/DC) system. The harmonic analysis has been done by taking the different loading conditions as shown in Table 3. To analyse the power quality of proposed system, a three-phase fault was initiated without STATCOM and the percentage of total harmonic distortion (THD) calculated. And it has been observe the average %THD value is drastically reduced from 144.42% to 7.25%.
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