Control architecture suitable for medium-low voltage DC power distribution and utilization system

Abstract

The invention relates to a control method suitable for a medium-low-voltage DC power distribution and utilization system. The method comprises three control layers: optimal control for the top layer,unified control for the intermediate layer, and distributed autonomous control for the bottom layer. The method comprises the following steps: 1) taking optimal control as the top layer control: achieving the optimal control in energy management, and providing a reliable scheduling instruction for a system control center, wherein the input data comprises prediction data, the real-time operation state information of the adjacent AC power distribution systems and the real-time operation state information of the medium-low voltage DC power distribution and utilization system; the output data of the energy optimization management is scheduling data and comprises voltage and power reference points and control parameters; and the internal functions of the energy optimization management comprisethree parts, namely reference point optimization, control parameter optimization and two time scale coordination strategies; 2) taking unified control as the intermediate layer control; 3) taking distributed autonomous control as the bottom layer control.

Description

technical field [0001] The invention relates to a control framework suitable for medium and low voltage DC power distribution and utilization systems, and belongs to the field of control and protection of DC power distribution and utilization systems. Background technique [0002] With the rapid development and wide application of new energy, new materials, information technology and power electronics technology, users' requirements for power consumption, power quality and power supply reliability continue to increase, and the existing AC distribution network is facing distributed power access. , diversification of load and power demand, complexity of power flow balance coordination control, and huge challenges in terms of power supply stability, efficiency, and economy. Moreover, with the rapid growth of city scale and the rapid development of information technology, there are more and more sensitive loads, important loads and nonlinear loads in the power grid. The AC power...

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Problems solved by technology

[0003]However, with the massive access of random loads such as intermittent distributed power sources and electric vehicles, the DC power distribution system is composed of wind, light, energy storage, etc. Composed of "source-grid-load" such as power supply, AC / DC load, microgrid and flexible DC converter station, there are many uncertain factors, the system power changes rapidly, and the system operates in various modes

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