A Novel AC Voltage Dynamic Regulator Based on Supercapacitor Energy Storage
Release time：
2023-02-28
The widespread application of high-power power electronic conversion devices has brought serious power quality problems to distribution networks [1]. Among these problems, voltage fluctuations, including sags, surges, sags, and flickers, are the most common hazards [2-3]. They can lead to accidents such as abnormalities in automatic control equipment, loss of computer data, and then cause significant economic losses.
In order to reduce such risks, the use of various AC voltage stabilization and regulation devices at sensitive load terminals has become an application trend. The existing large capacity AC regulated power supplies are mainly based on autotransformers and thyristor controlled multi tap transformers, which not only have low dynamic response speed but also do not have harmonic suppression capabilities. Although AC purification power supplies based on pulse width modulation (PWM) inverters and choppers provide ideal voltage waveforms, they are still limited to a small range of applications due to the constraints of main circuit efficiency, especially cost. Various active AC voltage regulation devices based on series compensation proposed in recent years have received extensive attention and in-depth research due to their small main circuit capacity, fast response speed, and high operating efficiency. [5-6], which has become one of the main development directions of AC voltage regulation. In order to achieve bidirectional fast adjustment of the output voltage, literature [7] uses a bipolar AC chopper to compensate the system voltage in series; Reference [8] also uses a voltage source inverter powered by an uncontrollable rectifier bridge to simultaneously achieve voltage sag and harmonic compensation. However, these schemes rarely consider both bidirectional output voltage regulation and waveform distortion compensation simultaneously; In particular, due to the lack of sufficient energy storage capacity, under compensation will still occur when the system voltage continues to drop or sag, threatening the uninterrupted operation of the load.
This paper proposes a novel single-phase AC voltage dynamic regulator scheme based on supercapacitor energy storage, using dual half bridge converter circuits for AC voltage compensation and DC energy storage regulation. The voltage dynamic compensation technology used in the series compensation circuit enables it to suppress voltage disturbances including amplitude fluctuations and waveform distortion; The use of common DC side supercapacitors not only ensures the energy required to compensate for severe voltage sags and sags in the system, but also significantly reduces the system's requirements for instantaneous power balance control of DC circuits, and reduces the number of starts and operating time of the energy storage regulator converter, thereby ensuring the output power quality and efficient and reliable operation of the regulator.
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2023-02-28
Guangzhou FDGEN Automation Control Equipment Co., Ltd. is a private high-tech enterprise specializing in the research, development and production of control systems for internal combustion engines, alternators, power systems, diesel fire pumps, and other equipment.
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