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

An AC-DC hybrid and control method technology, applied in the field of AC-DC microgrid control, can solve the problems of photovoltaic uncertainty, photovoltaic output uncertainty and uncontrollable power grid, and achieve the effect of improving flexibility and controllability
CN112542835AActive Publication Date: 2021-03-23SOUTHEAST UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2021-03-23

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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.
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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...

Claims

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