ABSTRACT:
This paper proposes a three-phase three-wire photovoltaic
generation inverter grid-connected operating and harmonic elimination hybrid
system. The hybrid system mainly consists of photovoltaic array battery,
photovoltaic output filter, three-phase voltage-type inverter, inverter output filter
and passive filters. Based on working principle and working characteristics of
the proposed hybrid system, the composite control strategy about active power,
reactive power and harmonic suppression
is proposed. The composite control strategy mainly consists of a single
closed-loop control slip of active power and reactive power, double closed-loop
control slip of harmonics. Simulation results show the correctly of this paper’s
contents, the hybrid system have an effective to improve power factor, supply
active power for loads and suppress harmonics of micro-grid.
KEYWORDS:
1.
Micro grid
2.
Harmonic restraint
3.
Active power control
4.
Reactive power control
5.
Photovoltaic generation
SOFTWARE: MATLAB/SIMULINK
(a)
Current dynamic waveform of load and grid side
(b)
Current spectrum waveform of load and grid side
(c)
Voltage and current dynamic waveform of grid side
(d)
Voltage waveform of the DC capacitor
Figure
2. Simulation results when photovoltaic generation is connected.
(a)
Current dynamic waveform of load and grid side
(b)
Current spectrum waveform of load and grid side
(c)
Voltage and current dynamic waveform of grid side
(d)
Voltage waveform of the DC capacitor
Figure
3. Simulation results when photovoltaic generation is not connected.
CONCLUSION:
Aiming
at the shortages and problems of active power, reactive power and harmonic
control technology in microgrid, a three-phase three-wire photovoltaic
generation inverter grid-connected operating and harmonic elimination hybrid
system is proposed in this paper. The principle and control strategy of the
proposed hybrid system are studied. Through the research of this paper, the
following conclusions can be drawn:
(1)
The compensation of active, reactive power and the real-time dynamic control of
harmonics can be realized through the proposed hybrid system.
(2)
Based on the working principle of the proposed hybrid system at different time,
the hybrid control method of active power, reactive power and harmonic
suppression is proposed. The proposed control strategy is simple and easy to be
implied in engineering.
(3)
Simulation results show the correctly of this paper’s contents, at the same
time, the proposed control method can also be applied to other similar systems
in this paper.
REFERENCES:
[1]
Ding Ming, Wang Min.Distributed generation technology. Electric Power
Automation Equioment, vol. 24, no.7, pp. 31–36, July 2004.
[2]
Liang Youwei , Hu Zhijian , Chen Yunping. A survey of distributed generation
and it s application in power system. Power System Technology, vol. 27,
no.12, pp. 71-75, December 2003.
[3]
Wang Chengshan, Xiao Chaoxia, Wang Shouxiang. Synthetical Control and Analysis
of Microgrid. Automation of Electric Power Systems, vol. 32, no.7, pp.
98-103, April 2008.
[4]
Liu Yang-hua1,Wu Zheng-qiu,Lin Shun-jiang. Research on Unbalanced Three-phase
Power Flow Calculation Method in Islanding Micro Grid. Journal of Hunan
University(Natural Sciences) , vol. 36, no.7, pp. 36-40, July 2009.
[5]
Xie Qing Hua, Simulation Study on Micro-grid Connection/Isolation Operation
Containing Multi-Micro-sources. Shanxi Electric Power,vol. 37, no.8, pp.
10-13, August 2009.
