Demand side optical storage integrated microgrid system control strategy

Abstract

The invention relates to a demand side optical storage integrated microgrid system control strategy. Given: PPG(t) is photovoltaic power generation output power, PESS(t) is energy storage system output power, Pload(t) is original load power, and Pgrid(t) is optical storage microgrid system and large power grid energy exchange. When PESS(t) is larger than 0, an energy storage system carries out discharging; when PESS(t) is smaller than 0, the energy storage system is charged; when Pgrid(t) is larger than 0, Pgrid(t) is equal to P'load(t), and P'load(t) is load power needed after a load in a microgrid is charged and called synthetic load power; when Pgrid(t) is smaller than 0, Pgrid(t) is equal to Pout(t), and Pout(t) is microgrid system output power, namely, electric selling to large power grid power. Energy losses of all parts of a system are ignored, it can be obtained that Pload(t)=PPG(t)+PESS(t)+Pgrid(t) through the law of conservation of energy and microgrid operation restraint, when Pgrid(t) is smaller than 0, the microgrid sells electricity to a large power grid, the microgrid system output power is Pout(t)=PPG(t)+PESS(t)-Pload(t), aiming at time-of-use electricity price and electrical load characteristics, and according to the energy storage contributing strategy basic principle, charging is carried out at valley value electricity price, discharging is carried out at peak value electricity price, and the electricity expenses are reduced.

Description

technical field [0001] The invention belongs to the field of power generation control, and relates to a control strategy for a demand-side photovoltaic-storage integrated microgrid system. Background technique [0002] With the rapid development of society, the traditional fossil energy is gradually exhausted and the environmental pollution is becoming more and more serious. All countries in the world are developing various new energy sources, and they all regard the development of new energy sources as a long-term national development strategy. Renewable energy, clean energy and other small power generation systems that are miniaturized, modularized, decentralized, and arranged near users to supply power to users are being constructed or planned to be constructed around the world. The grid connection provides users with stable and reliable power supply, and can run off-grid in the event of a large grid failure, ensuring the continuity of power supply and high power quality....

AI Technical Summary

Problems solved by technology

[0005] Existing patents only focus on the control of a micro-grid system with integrated optical storage and do not consider special situations such as failures encountered in the system or grid-connected operation suddenly changing to off-grid operation. For the power grid, with the micro-grid The power generation power of the power grid system is increasing, and its impact on the power grid is gradually increasing. The requirements for the indicators of the micro-grid power generation system cannot be limited to the traditional ones such as voltage, current, power factor, harmonics, flicker, and short-circuit capability. It is stipulated that it must also be included in the power flow of the overall power grid for investigation and management, and the island problem should be dispatched and managed in order to improve the utilization rate of clean energy and realize the safe and economical operation of the grid receiving micro-grid system