Coordination control and optimization method for battery energy accumulation and photovoltaic power generation based on co-direct current bus

Abstract

The invention discloses a coordination control and optimization method for battery energy accumulation and photovoltaic power generation based on a co-direct current bus in synchronization and independent operation modes, which supports the access of various types of storage batteries and photovoltaic battery boards through the free combination of the co-direct current bus of a DC (Direct Current) / DC converter, the automatic intelligent charge-discharge management of a storage battery branch and the maximum power tracing management of a photovoltaic battery board branch, wherein the branches are completely independently controlled to realize optimization management; the energy collected by a direct current bus is interacted with the energy of a power grid or an independent load through a post DC / AC (Alternating Current) converter; the DC / AC converter adopts a method for carrying out directional vector control on the voltage of the power grid and modulating the space vector pulse widthof the voltage in the course of the synchronization operation in an active and reactive complete decoupling control mode; and V / f control is adopted in the course of the independent operation to provide a constant voltage and frequency reference to an alternating current bus. The result of an experiment proves that the invention can realize the coordination complementary control and the autonomous optimization management of photovoltaic power storage and has the advantages of good generality, practicality and application prospects.

Description

technical field [0001] The invention belongs to the technical field of power supply control in the field of distributed power generation, and is suitable for coordinated complementary control and optimal management of energy storage photovoltaics. Background technique [0002] Solar energy is inherently intermittent, unstable and uncontrollable. Energy storage technology can stabilize the volatility of this intermittent energy, making its load characteristics tend to be controllable "grid-friendly". At the same time, energy storage technology has been regarded as an important part of the six links of "production-generation-transmission-distribution-use-storage" in the process of power grid operation. In response to the actual needs of my country's power system, and in consideration of the national development strategy, the national medium- and long-term scientific and technological planning, and the sustainable development plan of the urban power grid, the State Grid Corpor...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of high access cost and complex coordinated control of multiple distributed power sources in the prior art, the present invention proposes a coordinated control and optimization of battery energy storage and photovoltaics based on a common DC bus in grid-connected and independent operation modes method, which supports flexible access of different types of energy storage batteries and photovoltaic panels, complete independent control and optimization management of each branch, and supports grid-connected and independent operation modes

Images