Energy storage expander adjustment

How do expanders work?

The expander can be operated with either constant pressure or sliding pressure as the expander inlet pressure is no larger than the air storage pressure. If it is constant pressure to enter expander, the air pressure from the cavern has to be reduced through a throttling valve which causes energy loss of the compressed air flow.

What are the input parameters for expander power generation system?

The air flow rate and heat storage medium flow rate are used as input parameters for the expander power generation system. The power generation system consists of a volumetric module, a heat exchanger module, a expander module, and a generator module.

Can a compressed air energy storage system store large amounts of energy?

The compressed air energy storage system described in this paper is suitable for storing large amounts of energy for extended periods of time.

What is expander control model?

The expander control model is shown in Fig. 3. The input of power control is power deviation and the output is throttle valve opening. According to the valve flow characteristic curve, the opening instruction can be converted into the corresponding air flow rate.

What is the performance constant of a dynamic expander?

The performance constant (m e 1, m e 2, m e 3, m e 4) can be (1.19,0.03,25,0.009) . Combining the above-mentioned dynamic control, the dynamic characteristics of the expander mainly consider the volume effects between each stage of the expander, as well as the dynamic response characteristics of the control elements.

What is i th expander?

It is similar to the compression process. For the i -th expander stage, the inlet temperature is T e in,i and the inlet pressure is p e in,i.