Impact Of Intermittent Power On Grid Voltage Operating Characteristics

It's becoming more and more urgent to look for new alternative energy sources in order to relieve energy crisis with the increasing exhaustion of conventional fossil energy. Wind and solar energy have got rapid development in recent years which are regarded as two promising energy forms before the realization of nuclear fusion.Wind and solar energy has random and intermittent nature significantly. It will have an affect on the safe and stable operation of the grid if a mass of wind and photovoltaic power stations are connected into the grid. With a great number of intermittent power connected into grid as the background, this paper mainly analyzes the impact of intermittent power on grid voltage operation performance.Steady-state analysis models of several intermittent power are built and summarized in this paper, including deterministic models and probabilistic models. The advantages and disadvantages of each model are analyzed and compared. The impact of various factors on voltage distribution and static voltage stability is studied with deterministic methods, such as the type and capacity of intermittent power, reactive power compensation.Wind speed of multiple wind farms located close each other will have a strong correlation. Wind speed and light intensity have natural complementary in a certain extent. All of these can cause certain correlation among the outputs of multiple intermittent power. The relevance model of wind speeds is built by using ARMA model and time-shifting technique. The complementary model of wind speed and light intensity is built by using FCM and multidimensional related normal distribution sampling. Based on the models, impacts of correlation factors on voltage probability density distribution are studied in this paper. The maximum permissible installed capacity and minimum of reactive power compensation are optimized by integrating wind speed relevance model into the chance constrained programming method. The research results reveal that it can help to access the impact of multiple intermittent power on network voltage profile more reasonably and select better network planning scheme and operating modes if correlation factors are considered.