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DESIGN AND IMPLEMENTATION OF A HYBRID POWER PLANT

CONTROLLERGeorge Alin Raducu

09.05.2018

Content

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Vattenfall at a Glance

Motivation for the Hybrid Power Plant Controller

Controller Design

Simulation Test Cases and Results

Field Implementation

Conclusions and Outlook

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Motivation

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Today‘s onshore wind farms layout

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Point of Common

Connection

Wind Farm Controller

Measurements

Operation Set-Points

TSO Commands

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Wind Farm Controller

Solar Park Controller

Battery Controller

Point of Common

Connection

Renewable Power Plants

SCADA

Energy

Signals

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Wind Farm Controller

Solar Park Controller

Battery Controller

Point of Common

Connection

Solution: Renewable Park Controller

Renewable Park Controller

SCADA Markets / Grid

Energy

Signals

Vattenfall’s Renewable Park Controller - Enhanced optimization functions based on Energy market spot prices, Weather Forecast & Grid demands

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Challenges and potential with Renewable Power Plants

• Challenges• Power Limitations in the Point of Common Connection

• Increase the utilization of the grid connection point whilesecuring against overloading

• Synchronization of the Ancillary Services provided bydifferent generation sources

• Flexibility in operating different generation and/or storageunits

• Multiple systems from various suppliers to service andmaintain

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Potential LCoE Reduction: Increased utilization of the shared grid

connection or agreements

LRoE Improvement: Approaching subsidy-free marketenables participation in different grid services markets toenhance additional revenues

Hybrid Power Plants: Wind+Solar+Storage connected ona common Point of Common Connection, increasedpower generation flexibility

Vattenfall in control with different smart optimizationalgorithms based on the market related functions,weather conditions and spot price forecast

Maximize yield (revenue) while providing grid supportfunction and minimizing fatigue loads

Easier Operation

Increased Flexibility

Controller Design

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Renewable Park Controller

Renewable Park Controller – Architectural Diagram

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Active Power Control

Reactive Power Control

Setpointdispatch

SCADA&

Measurements

Wind Farm,

PV Farm,

BESS

&

Grid

Plant design-WPP&SPP

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• Only main dynamics of the WPP and SPP included, i.e. first order transferfunctions plus delays introduced by the grid meters.

• Possibility to have different ramp rate limitations

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Plant Design - BESS

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• Similar to WPP and SPP in terms of dynamic behaviour.

• Contains additional information regarding SOC and conversion efficiency.

RPC Simulations Test Cases

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Simulated Hybrid Power Plant• Wind Power Plant : 122.4 MW

• Solar Power Plant : 40 MW

• Battery : 12 MW(h)

• Total Capacity (Base Power) : 174.4 MW

• Grid Connection Point Capacity: 130MW

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Case 1: Step Changes in Setpoint

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Case 2: Varying Possible Power

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Case 2a: Without battery support

Case 2b: With battery support

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Field Implementation

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The Field version

SCADAPLC Real plant

Generated code from Matlab/Simulink

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Conclusions and Outlook

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Conclusions

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The solution for steering and optimization of a Hybrid Power Plant was presented

Main challenges and potential were highlighted

The Renewable Park Controller design was shown

For validating the controller design simulations results have been introduced

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Outlook

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Verification of the Renewable Park Controller prior to the field implementation in aHardware in the Loop test setup

Field Implementation

Field Test and Verification

Continue the initial development with Enhanced Optimization Solutions based onEnergy market spot price, Weather Forecast, Ancillary Services and grid demands

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THANK YOU!!