641 / 2019-04-14 11:39:27

Study on Comprehensive Suppression Measures for Voltage over-limit of Distribution Network With Small Hydropower Group

Small hydropower; Reverse power; Voltage adjustment; Simulation

With the continuous development of small hydropower renewable clean energy , the voltage quality of regional distribution network rich in small hydropower groups has become a hot spot of concern. Especially in mountainous areas with run-of-river small hydropower, due to the large number of small hydropower connected to the distribution network at the end of the line, and the seasonal characteristics of small hydropower, the full-line voltage and key node voltage of the distribution network fluctuate greatly. This paper analyzes the relationship between reactive power and voltage quality from the perspective of reactive power balance. Through the analysis of the power system voltage regulation principle, four voltage regulation measures such as generator voltage regulation, change transformer ratio, reactive power compensation, and conductor optimization are obtained. Taking the actual distribution network in a certain area as an example, based on the PSASP (Power System Analysis Software Package) simulation software, a distribution network model with small hydropower groups is established. The problem of over-limitation of the line voltage of the distribution network in the reverse power state during the summer flood season is mainly studied. This paper simulates four kinds of voltage regulation measures, analyzes the voltage regulation effects of four voltage suppression methods, compares the voltage regulation effects, and proposes an operationally adjustable voltage regulation method. It has certain reference significance and engineering practical value for the voltage adjustment of the distribution network that enriches small hydropower in the future.