A three-layer combined heat and power microgrid energy control method for reducing wind curtailment

Abstract

The present invention discloses a three-layer heat and power combined supply microgrid energy control method for reducing wind curtailment. According to the method, the economic operation of a microgrid is divided into three time scales, namely, a day-ahead dispatching layer, a short-term adjustment layer and a real-time control layer. In the day-ahead dispatching layer, a dispatching period is divided into a plurality of periods, and day-ahead dispatching is converted into a mixed integer linear optimization problem based on day-ahead prediction data. In the short-term adjustment layer, short-term adjustment is converted into a non-linear optimization problem according to the startup-shutdown plans of the day-ahead dispatching layer and short-term prediction data. In the real-time control layer, a local controller carries out local control through adopting a flexible droop control mode according to a received optimization result of the short-term adjustment layer and actually-measured data. The three-layer heat and power combined supply microgrid energy control method for reducing wind curtailment is applicable to the grid-connected economic operation of a heat and power combined supply microgrid comprising various controllable power sources, uncontrollable power sources, heat storage, energy storage batteries and controllable loads, and is especially suitable for a heat and power combined supply microgrid containing wind curtailment.

Description

technical field

[0001] The invention belongs to the field of microgrid energy control of electric power systems, and in particular relates to a three-layer combined heat and power microgrid energy control method for reducing wind abandonment. Background technique

[0002] In the past 10 years, the installed wind power capacity has increased rapidly in countries around the world. In 2013, China's cumulative installed capacity reached 91GW, with an average annual growth rate of 21%. However, the curtailed wind volume across China reached 16,231GWh, resulting in an economic loss of US$1.5 billion. The lack of flexibility in the operation of cogeneration units is the main reason for wind curtailment in northern China. The electrical power of a CHP unit is usually constrained by the heating load. During the heating period in winter, especially at night, the electrical load is low and the heating load is large. In order to meet the heating demand, the combined heat and power u...

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