Multi-level control method for high-proportion photovoltaic access alternating-current and direct-current hybrid microgrid

Abstract

The invention discloses a multi-level control method for a high-proportion photovoltaic access alternating-current and direct-current hybrid microgrid. A system is sequentially divided into three levels, namely a microgrid local control layer, a PET power flow control layer and a power distribution network area control layer. A typical scene set is generated according to the uncertainty of photovoltaic output, and photovoltaic and energy storage devices are bundled to serve as a control main body to complete the control of the level 1; a PET control mode is set according to the network type connected with the PET port, and a PET port control variable is adjusted to complete the control of a layer 2; and other flexible controllable resources in the superior power grid area are adjusted according to the control result of the level 1 to complete the control of the level 3. The method has high flexibility and practicability, photovoltaic output uncertainty, system voltage quality and operation economy are considered, different control targets are set for different levels in the AC-DC hybrid microgrid, the autonomous operation capability of each microgrid area is utilized, the control difficulty is simplified, and interconnection interaction and coordination control among the micro-grid areas are realized.

Description

technical field [0001] The invention belongs to the technical field of AC-DC micro-grid control, and in particular relates to a multi-level control method for an AC-DC hybrid micro-grid with a high proportion of photovoltaic access. Background technique [0002] In recent years, with the rapid growth of photovoltaic penetration, the operation of active distribution networks has become complicated. Photovoltaic power generation is affected by the intensity of solar radiation, and its output has strong randomness, intermittency and volatility. When its access ratio is high, it will have a negative impact on the grid's peak regulation, frequency regulation, backup, power flow, bus voltage, etc. greater impact. How to ensure the economic and stable operation of the power grid while improving the utilization rate of photovoltaics has gradually become a research hotspot. [0003] The electric energy generated by photovoltaic power generation is mainly in the form of DC. At the s...

AI Technical Summary

Problems solved by technology

Solve the uncontrollable impact of photovoltaic output uncertainty on the power grid, and use scene analysis technology to deal with photovoltaic uncertainty

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