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11. A strategy for suppressing the second harmonic of output power for photovoltaic grid-connected inverters with low voltage ride-through

Author

Zhang Huifen, Yang Haitao, Wang Xijing, and Zhao Xibin

Subjects
Computer science, 020209 energy, 020208 electrical & electronic engineering, Photovoltaic system, 02 engineering and technology, AC power, Power (physics), Control theory, Harmonics, 0202 electrical engineering, electronic engineering, information engineering, Harmonic, Low voltage ride through, Low voltage, Voltage drop
Abstract

When an unbalanced voltage drop occurs in the grid system , output power of distributed photovoltaic grid-connected system will generate second harmonics. In order to suppress the second harmonic, a new low voltage ride-through control strategy is proposed, which can adjust the harmonic suppression target according to the degree of voltage drop. This strategy can suppress the second harmonic of active power when the voltage drop is low, and suppress the second harmonic of reactive power when the voltage drop is large. The control strategy is simulated in MATLAB, and the results testified its effectiveness.

Published
2019
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12. A Principle of Fault Line Selection Based on Increasing Zero-sequence Current in Non-ground Neutral System

Author

Zhang Huifen, Gao Zhipeng, Guo Yao, and Huang Tantan

Subjects
Computer science, 020209 energy, Hardware_PERFORMANCEANDRELIABILITY, 02 engineering and technology, Fault (power engineering), Capacitance, Symmetrical components, law.invention, Power (physics), Computer Science::Hardware Architecture, Capacitor, Control theory, law, 0202 electrical engineering, electronic engineering, information engineering, Line (text file), Current (fluid), Computer Science::Operating Systems, Computer Science::Distributed, Parallel, and Cluster Computing, Selection (genetic algorithm)
Abstract

In order to solve the problem of low accuracy of single-phase earth fault selection in non-ground neutral system, in this paper, the method that increasing the zero current of fault line at a short time when the single-phase earth fault occurs is proposed by using injection principle to strengthen the fault steady-state characteristic so as to expand the gap of circuit criterion between the fault line and the non-fault line, meanwhile, improve the selection criterion based on fault steady-state characteristics. According to the single-phase earth fault steady-state characteristics of zero-sequence current, the power capacitor is used to inject the capacitance current to realize the increase. Depending on the principle of not affecting the operation of distribution network, the strength of the increased current is determined. Such equipment has been implemented in power networks, and the result of detecting fault line is accurately.

Published
2018
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