The large-scale access of distributed generator (DG) in distribution network has increased the difficulty of traditional distribution network protection calibration, and experts and scholars have proposed a variety of solutions, but how to accurately identify and remove ground faults with large transition resistance is still a difficult problem. Therefore, this paper proposes a magnitude comparative protection principle based on the Total harmonic distortion (THD) short-time integration parameter, and the applicability of the proposed protection principle is verified by simulation using the PSCAD simulation platform. From the theoretical analysis and simulation verification, it can be seen that the protection principle has good sensitivity in recognizing various ground faults with large transition resistances, and also has good applicability to interphase faults, which provides a new scheme for improving the transition resistance capability of distribution network protection.
This paper analyzes the typical daily load of a campus micro-grid laboratory. In order to solve the problem of excessive peak-valley difference caused by peak load in the laboratory, and transformer overload and loss increase caused by unbalanced energy consumption between distribution rooms, back-to-back DC transmission system is introduced to establish the circulation medium of exchange power on high load rate lines and low load rate lines, and photovoltaic cells and battery energy storage system are introduced to establish a multi-objective optimization model, The multi-objective particle swarm optimization algorithm is used to solve the problem, which can effectively reduce the problem of overload and loss of transformer caused by the peak load in the laboratory and the imbalance of energy consumption between distribution rooms.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.