With the depletion of global fossil energy, the development of renewable energy power generation has played an important role in alleviating the current power grid tension. However, due to the greater impact of the volatile and intermittent characteristics of renewable energy such as wind power and photovoltaic, the operation of the power grid, such as work, frequency, voltage and so on, there are many key technologies involved, such as load forecasting technology, voltage and reactive power control technology, active power dispatching technology, etc. This book focuses on the system's optimal dispatching problem of renewable energy access and conducts systematic research.