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Feedforward control method for voltage transient compensation of point of common coupling (PCC) of common load and system

A common connection point, compensation feed-forward technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, electrical components, etc., can solve micro-grid transient instability, long voltage recovery time harmonics, voltage fluctuations and other problems, to achieve the effect of speeding up the voltage recovery process, speeding up the transient response, and increasing the robustness

Active Publication Date: 2019-11-15
NORTH CHINA UNIVERSITY OF TECHNOLOGY +2
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  • Abstract
  • Description
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Problems solved by technology

However, when the load is cut in and out, or with a nonlinear load, simple droop control cannot solve the problems of long voltage recovery time and harmonics
When the microgrid island operation mode is adopted, the high penetration rate of new energy will lead to power quality problems such as voltage fluctuations and harmonics caused by the randomness of load and new energy output, and even cause transient instability of the microgrid. Great impact on users and microgrids

Method used

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  • Feedforward control method for voltage transient compensation of point of common coupling (PCC) of common load and system
  • Feedforward control method for voltage transient compensation of point of common coupling (PCC) of common load and system
  • Feedforward control method for voltage transient compensation of point of common coupling (PCC) of common load and system

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Embodiment Construction

[0059] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus their repeated descriptions will be omitted.

[0060] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or mo...

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Abstract

The invention relates to a feedforward control method for voltage transient compensation of a point of common coupling (PCC) of a common load and a system. The method comprises the steps of collectingthe total current of the common load from the PCC of the common load to serve as a disturbance signal, and synchronously transmitting the disturbance signal to each inverter; deriving a transfer function matrix taking the disturbance quantity as input and the residual quantity as output by establishing a state space model and a state observer of a control object, and generating a residual value of the inverters through the transfer function matrix; and taking the residual value as an input signal of a feedforward compensator of the inverters to complete feedforward control for the voltage transient compensation of the PCC of the common load of the inverters. According to the invention, the voltage recovery process is significantly accelerated through the fast compensation for disturbance,and the robustness of the system is increased.

Description

technical field [0001] The present disclosure relates to the field of power electronics, in particular, to a PCC voltage transient compensation feedforward control method and system of a public load common connection point. Background technique [0002] In recent years, with the development of new energy sources such as wind and solar and small gas turbine technologies, microgrids have attracted attention from all walks of life. A microgrid is a small power generation and distribution system that organically integrates distributed power sources, energy storage, loads, control units, and monitoring and protection devices. It is the link that connects the distribution network and distributed power sources. There are two operating modes of the microgrid: grid-connected and island-connected. During grid-connected operation, because the large power grid has a large capacity and absorbing capacity, when there is load switching or new energy output fluctuations, there will be no si...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/18
CPCH02J3/1842H02J3/381Y02E40/30
Inventor 胡长斌张悦罗珊娜马瑞范辉周京华温春雪朴政国
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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