A power grand composite curves approach for analysis and adaptive operation of renewable energy smart grids
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Abstract
This work proposes the use of the power grand composite curves (PGCC) method to identify energy recovery targets in renewable energy smart grids and to adaptively adjust their operation in short-term energy requirements through appropriately selected power management strategies (PMS). A PMS is the sequence of decisions offering efficient utilization of resources and equipment to meet specific targets. The aim is to identify the appropriate PMS within recurrent subsequent time intervals that efficiently serves the desired operating goals in view of operating variability. This is approached by predicting the PGCC for a time horizon extending into the future. Subsequently, the PGCC is appropriately shifted to set a target for the minimum energy inventory needed by the end of the current interval for which decisions about the system operation are sought in order to satisfy the system operating goals. The target energy inventory is guaranteed in the current interval by selecting the PMS that best matches the identified target. A formal mathematical framework is presented, associating Pinch analysis with PMS within a generic model considering numerous structural and temporal grid interactions. The proposed method is implemented on an actual hybrid smart grid considering multiple RES-based energy generation and storage options.
Keywords
Smart grids Energy management Power pinch analysis Grand composite curvesAbbreviations
List of symbols
- \({\text{AEEND}}^{{l,q_{k} }}\)
Available excess electricity for next interval for accumulator l under PMS q k
- BAT
Battery
- BF
Low-pressure (buffer) storage tanks
- Cl
Capacity of accumulator l
- CMP
Compressor
- DSL
Diesel generator
- EL
Electrolyzer
- \(F_{n}^{{{\text{In}},j}}\)
Input flow at resource n, in state j
- \(F_{m \to n}^{{{\text{Out}},j}}\)
Output flow from resource m to resource n, in state j
- FC
Fuel cell
- FT
Long-term storage tank
- f
Function that defines a PMS
- H
Overall time span
- H2HP
Hydrogen in high pressure
- H2LP
Hydrogen in low pressure
- H2O
Water
- HRES
Hybrid renewable energy system
- hk
PMS in interval k
- L
Logical operator
- \(L_{m \to n}^{i}\)
Logical operator for the variable \(\varepsilon_{m \to n}^{i} \left( t \right)\)
- \(L_{m \to n}^{{{\text{SOAcc}}^{l} }}\)
Logical operator for the accumulator l
- LD
Load
- Lo
Lower desired limit
- \({\text{Lo}}_{m \to n}^{{{\text{SOAcc}}^{l} }}\)
Lower desired limit for accumulator l
- \({\text{MOES}}^{{l,q_{k} }}\)
Maximum outsourced energy supply for accumulator l under PMS q k
- Nc
Control horizon
- Nlm
Number of Lo type limits
- Np
Prediction horizon
- \({\text{OES}}^{{l,q_{k} }}\)
Outsourced energy supply required for accumulator l under PMS q k
- P(t)
Net power in the system, i.e., power produced by RES—power demanded by LD
- PCC
Power composite curve
- PGCC
Power grand composite curve
- PMS
Power management strategy
- POW
Electrical power
- PV
Photovoltaic panels
- pk
PMS in interval k
- Q
Set of all available PMS
- qk
PMS in interval k
- RES
Renewable energy sources
- Rs
Set of resources
- \(r_{m \to n}^{{{\text{SOAcc}}^{l} }}\)
Parameter associated with temporal conditions in accumulator l
- \({\text{SF}}_{n}^{j}\)
External input at resource n, in state j
- SOAccl
State of accumulator l
- \({\text{SOAcc}}_{ \hbox{min} }^{l}\)
Initial value of SOAcc l that produces the minimum value of SOAcc l
- \({\text{SOAcc}}^{{l,q_{k} }}\)
State of accumulator l under PMS q k
- \({\text{SOAcc}}_{\text{req}}^{{l,q_{k} }}\)
Initial value of SOAcc l that produces the minimum value of SOAcc l equal to Lo
- \({\text{SOAcc}}_{\text{TAR}}^{l}\)
Target value for SOAcc l
- St
Set of states
- T
End of time interval
- th
Time duration of hysteresis zone
- tLo
Instant when \({\text{SOAcc}}^{{l,q_{k} }}\) reaches the value of the limit Lo
- tmin
Instant when \({\text{SOAcc}}^{{l,q_{k} }}\) reaches the minimum value of \({\text{SOAcc}}^{{l,q_{k} }}\) in interval k
- t0
Beginning of time interval under study
- t−
Previous time instant
- Up
Upper operating limit
- \({\text{Up}}_{m \to n}^{{{\text{SOAcc}}^{l} }}\)
Upper operating limit for accumulator l
- WG
Wind generator
- WT
Water tank
Greek symbols
- az
Weights used in Eqs. (11) and (12a, b)
- ΔT
Duration of time interval
- \(\varepsilon_{m \to n}\)
Binary variable that defines the connection of resource m to resource n
- \(\rho_{m \to n}^{{{\text{SOAcc}}^{l} }}\)
Binary variable associated with temporal conditions in accumulator l
Subscripts/Superscripts
- Acc
Accumulator
- Avl
Available
- Conv
Converter
- Gen
General
- In
Input
- j
State of a converter or accumulator
- k
Time interval
- l
Accumulators as part of the set of resources
- Mat
Materials
- max
Maximum
- min
Minimum
- n, m
Resources (converters or accumulators) indicating the type of equipment employed to perform conversion and accumulation tasks \(m,n \in {\text{Rs}},m \ne n\)
- Nrg
Energy
- OFF
Deactivated converter
- ON
Activated converter
- Out
Output
- Req
Required
- TAR
Target
- z
Limit number, \(z \in \left[ {1,N_{lm} } \right]\)
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