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Micro-grid voltage disturbance control method with voltage harmonic compensation

A voltage harmonic and micro-grid technology, applied in reactive power compensation, harmonic reduction devices, AC network voltage adjustment, etc., can solve problems such as single adjustment disturbance voltage harmonic compensation

Active Publication Date: 2015-08-12
NORTHEASTERN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods only adjust the disturbance voltage and provide harmonic compensation, and there is no method that can adjust the voltage and suppress the harmonics at the same time.

Method used

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  • Micro-grid voltage disturbance control method with voltage harmonic compensation
  • Micro-grid voltage disturbance control method with voltage harmonic compensation
  • Micro-grid voltage disturbance control method with voltage harmonic compensation

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Embodiment Construction

[0076] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0077] When a microgrid voltage disturbance control method with voltage harmonic compensation is implemented, the structural block diagram of the microgrid is as follows figure 1 As shown, it can be composed of multiple distributed generation units (DG), multiple voltage source inverters (VSI) and corresponding line impedances; in order to describe in detail the microgrid voltage disturbance with voltage harmonic compensation Control method, the main circuit diagram of the microgrid adopted in this embodiment is as follows figure 2 As shown, it consists of two distributed generation units (DG), two parallel VSIs with a set of LCL filters, and a common local nonlinear load formed by a rectification filter capacitor. The block diagram of the single-phase layered structure of the microgrid adopted in this embodiment is as follows: im...

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Abstract

The invention discloses a micro-grid voltage disturbance control method with voltage harmonic compensation, and belongs to the field of electrical technology. According to the invention, droop control, proportional resonance control and harmonic compensation control are mainly employed for a plurality of inverters in parallel connection. When a micro-grid voltage fluctuates, reactive power is uniformly divided through droop control, and a disturbance voltage is adjusted. Also, the high-order harmonic wave of the micro-grid voltage can be extracted through detection, the first-order elimination is carried out through proportional resonance control, and then the second-order elimination is carried out through the harmonic compensation control. Finally, the above results are outputted in a voltage mode through a PWM control inverter. The method can effectively improve the operation characteristics of an intermittent and unstable power supply in real time, also can adjust the voltage disturbance and the harmonic voltage, achieves the effects of voltage stabilization and voltage harmonic elimination, improves the capability of micro-grid regulation and control, improves the stability and reliability of the micro-grid operation, and improves the grid-connected capability of a micro-grid.

Description

Technical field [0001] The invention belongs to the field of electrical technology, and in particular relates to a method for controlling voltage disturbance of a microgrid with voltage harmonic compensation. Background technique [0002] In recent years, microgrids have developed rapidly. At the same time, due to the advantages of mutual independence, high controllability and high security of distributed power generation systems, distributed power generation has gradually become the mainstream of new energy power supply in microgrids. However, distributed generation has randomness, fluctuation and intermittent defects at the same time, which also makes the disturbance voltage often appear in the microgrid, which seriously affects the voltage stability of the microgrid. In addition, due to the existence of multiple parallel inverters in the microgrid and the use of some power electronic devices, voltage harmonics will be generated in the microgrid and pollute the grid. Alth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/01
CPCY02E40/30Y02E40/40
Inventor 闫士杰高文忠张化光李世亚闫伟航
Owner NORTHEASTERN UNIV
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