modelSSCSP_Controller

Information

This component determines the mass flow rates of both the receiver and power block mass flow rates. The variable m_guess calculates the required receiver mass flow to achieve target outlet temperature T_target based on inlet enthalpy from either storage bottom outlet, PB outlet or a combination of both. Depending on whether the storage is allowed to charge, discharge and relative size of m_guess wrt minimum flowrate and PB design flowrate, one of the 6 operating states is chosen.

Parameters

Type	Name	Default	Description
SI.Temperature	T_recv_max	550.0 + 273.15	Maximum tolerated receiver input temperature
SI.Temperature	T_recv_start	530.0 + 273.15	Receiver input temperature at which receiver can start
SI.Temperature	T_PB_min	680.0 + 273.15	Minimum tolerated PB input temperature
SI.Temperature	T_PB_start	710.0 + 273.15	PB input temperature at which it can start
SI.Temperature	T_target	740.0 + 273.15	Target receiver outlet temperature
SI.MassFlowRate	m_flow_PB_des	100.0	Reference power block mass flow rate
SI.HeatFlowRate	Q_des_blk	200e6	Power block design heat rate
SI.SpecificEnthalpy	h_target	HTF.specificEnthalpy(HTF.setState_pTX(101323.0, T_target))	Target specific enthalpy of the receiver outlet
SI.HeatFlowRate	Q_rcv_min	0.10*Q_des_blk	Minimum receiver heat-rate to start mass flow to receiver
SI.MassFlowRate	m_0	1e-8	Minimum mass flow rate through any pipe
SI.MassFlowRate	m_min	1e-8	minimum mass flow rate to start
SI.Time	t_wait	1.0*3600	Waiting time between turning off PB and being able to turn on

Connectors

Type	Name	Description
Modelica.Blocks.Interfaces.RealInput	Level_Hot	Temperature of the top of HTF in storage
Modelica.Blocks.Interfaces.RealOutput	m_flow_PB	Power block mass flow?
Modelica.Blocks.Interfaces.RealOutput	m_flow_recv	Receiver mass flow?
Modelica.Blocks.Interfaces.RealOutput	Q_defocus	Required defocus heat
Modelica.Blocks.Interfaces.BooleanOutput	defocus	defocus receiver?
Modelica.Blocks.Interfaces.RealInput	Q_rcv_raw	The net receiver heat rate before curtailment
Modelica.Blocks.Interfaces.RealInput	h_tank_outlet	Enthalpy of the HTF coming out of bottom of tank

Components

Type	Name	Description
Integer	Control_State	1-6 Determines which pumps are flowing and whether defocus is on
Boolean	Chg	Can the storage be charged?
Boolean	Disch	Can the storage be discharged?
Boolean	PB	Can the PB be turned on?
SI.MassFlowRate	m_guess	Guess required flow rate of recv
SI.Time	t_threshold	if time passes this value, PB := true

Name	Description
HTF

Revisions

By Zebedee Kee on 03/12/2020