Multifunctional Power Quality Controller and Power Quality Control Method

A technology of power quality and control method, applied in the direction of AC network voltage adjustment, AC network to reduce harmonics/ripples, harmonic reduction devices, etc. Safe and stable operation of power grid, frequent overvoltage and overcurrent, etc.

CN104934983BActive Publication Date: 2018-04-27TIG TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-04-27

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Abstract

The invention discloses a multifunctional electric energy quality controller and an electric energy quality control method in which the controller is used. The electric energy quality controller comprises a fundamental wave current detection unit, a control unit and a serial transformer unit, fundamental wave current signals at the primary side of the transformer serve as reference signals, current signals at the secondary side of the transformer serve as feedback signals, a current source is generated via a closed loop control, and he current source is applied to the secondary side of the serial transformer unit. The controller and method can realize functions including harmonic wave isolation, tidal current adjustment, overvoltage and overcurrent limitation, soft starting and reactive compensation.
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Description

technical field

[0001] The invention belongs to the field of electric power technology, and in particular relates to a multifunctional power quality controller and a power quality control method that can be used in a microgrid. Background technique

[0002] The dual pressure of environmental protection and energy shortage has promoted the construction of smart grid with low-carbon green energy as the core. Distributed power generation is the only way to solve future energy demand, and micro-grid is the seamless connection of distributed power generation to large power grid. It is also an important basis for building a smart grid. The flexible operation mode of the microgrid can improve the reliability of power supply for users and the utilization rate of distributed energy, reduce the impact on the large power grid, and have good economic and social benefits. Due to the diversity of microgrids in terms of power sources, loads, energy conversion units, energy storage, and op...

Examples

Embodiment Construction

[0030] Embodiments of the present invention will be described in detail below. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0031] refer to figure 1 , In one embodiment, the multifunctional power quality controller includes a fundamental wave current detection unit I, a control unit II, a series transformer unit III and a passive filter unit IV.

[0032] The current detection unit I includes a current transformer 1 for detecting the primary side current of the transformer (that is, the current flowing between the large grid and the microgrid), a fundamental wave detection link 3 and a current transformer 2 for detecting the secondary side current of the transformer. The current transformer 1 is connected in series on the primary side of the transformer, the output terminal of the current transformer 1 is connected with the input terminal of the fundamental wave current dete...