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SunSpec Inverter Controls Model SunSpec Alliance Members’ Meeting Jan 2012.

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Presentation on theme: "SunSpec Inverter Controls Model SunSpec Alliance Members’ Meeting Jan 2012."— Presentation transcript:

1 SunSpec Inverter Controls Model SunSpec Alliance Members’ Meeting Jan 2012

2 Inverter Controls Model  Defines a model for support of programmed, scheduled and autonomous inverter control operations.  New inverter control modes to be optional on a feature basis, via a set of new SunSpec Device Identifiers (DIDs).  Allows the inverter to offer a set of capabilities to clients and for those clients to discover the capabilities of the inverter and to skip function blocks it does not recognize or implement.  Applies to PV inverters, with or without battery storage.  Based on past and on-going work in various industry and standards bodies, including IEC TC57/WG17, DNP3 User’s Group and EPRI. o Aligns with IEC draft and EPRI draft

3 Current Inverter Model  Basic inverter measurements and status; no control operations.  Two maps defined: integer with scale factors and floating point without scale factors. Unique DID for each map.  Inverter model map elements: o AC current and voltages (all phases) and scale factors o AC power, AC frequency, AC VA, AC VAR, AC PF, AC Energy o DC current, voltage, power and scale factors o Temperatures (4) and scale factor o SunSpec status (enumeration), vendor defined status o SunSpec event flags (64 bits), vendor defined event flags (128 bits)

4 Inverter Controls Model Overview  Nameplate Ratings  Basic Settings  Extended Measurements and Status  Controls o Immediate Controls o Basic Storage o Pricing Signal o Static Volt-VAR Arrays o Frequency-Watt Curve o Dynamic Reactive Current o LVRT/HVRT Arrays o Watt-PF o Voltage-Watt o Basic Scheduling

5 Chained Control Blocks with Defined Device IDs

6 Nameplate Ratings  Read-only values set by inverter manufacturer o Inverter Ratings (Watt, VA, VAR) o Storage Ratings (Amps, Ahr, Whr, Max Charge Rate, Max Disch. Rate  Required if any controls blocks are used

7 Basic Settings  Operating limits and reference values used in control functions o WMax, PRef, VMin, VMax, VAMax, VarMax, VRef, VRefOfs o MaxWLimPct, ECPNomHz  Default ramp rates o MaxRmpRte  Measurement/setting meanings o PFSign, VarAct, ClcTotVA, ConnectedPhase  Required if any controls blocks are used

8 Extended Measurements/Status  Inverter present/available  Storage present/available  ECP connection status  Real energy (64-bits)  Apparent energy (64-bits)  Reactive energy by quadrant (64-bits each)  Available VARs  Time source and current time  Required if any controls blocks are used

9 Immediate Controls  Connect/disconnect from grid  Max power output [curtailment] (% WMax)  Fixed PF (cos( ϕ ) + excitation)  Fix VAR (% VarMax)  Plus random time window, reversion time, ramp time

10 Basic Storage  Setpoints for max charge, max charging VA  Set maximum charge/discharge gradients  Set minimum reserve storage (% max storage)  Status/Measurements o Charge state, state of charge, battery voltage, charge status  Set storage control mode (charge/discharge)  Ramp rates o Power output rate, power input rate o Random window, reversion time, ramp time for in/out power rates  Grid charge allowed (yes/no)

11 Pricing Signal  Pricing signal type o Absolute price o Relative price o Price multiplier o Qualitative (high/medium/low)  Pricing signal value  Random window, reversion time, ramp time  Used with built-in pricing knowledge or pricing schedule

12 Static Volt-VAR  Curve-based description of response o Variable number of curves (recommend min 4) o Variable number of points (recommend min 10)  Curves contain points and filter/ramp values o Volt-VAR pairs as %VRef and %VarAval o Low pass filter time (seconds) o Increment and decrement ramps (%VarAval/min) o Number of active points in curve  Random time window, reversion time, ramp time

13 Frequency-Watt  Parameter or curve-based  Parameter method o Watt reduction gradient o Start frequency o Stop frequency o Hysteresis  Curve-based description of response o Variable number of curves (recommend min 4) o Variable number of points (recommend min 10)  Curves contain points and filter/ramp values o Frequency-Watt pairs as Hertz and %PRef o Low pass filter time (seconds) o Increment and decrement ramps (%WMax/min) o Number of active points in curve

14 Dynamic Reactive Current Support  Inject additional reactive current based on change in voltage  Upper/lower zone limits, outside which no additional VARs supplied  Upper/lower delta voltages, below which no additional VAR support  Gradient for additional inductive or capacitive current  Filter time for calculating average voltage  Hysteresis voltage

15 LVRT/HVRT  Curve-base description o Must disconnect curve o Optional must remain connected curve o Variable number of points (recommend min 10)  Curves contain points o Time-Voltage pairs as seconds and %VRef  Min/max service voltage for reconnection  Delay times for reconnection

16 Watt-Power Factor  Curve-based description of response o Single curve (infrequently changed control) o Variable number of points (recommend min 10)  Curve contains points and filter/ramp values o Watt-PF pairs as %WMax and cos( ϕ ) plus PF excitation o Low pass filter time (seconds) o Increment and decrement ramps (%PF/min) o Number of active points in curve  Random time window, reversion time, ramp time

17 Volt-Watt  Curve-based description of response o Variable number of curves (recommend min 4) o Variable number of points (recommend min 10)  Curves contain points and filter/ramp values o Volt-Watt pairs as %VRef and %WMax o Low pass filter time (seconds) o Increment and decrement ramps (%WMax/min) o Number of active points in curve  Random time window, reversion time, ramp time

18 Basic Scheduling  Array-based X-Y description of schedule o Variable number of schedules (recommend min 4) o Variable number of entries (recommend min 10) o Variable X meaning (relative time, temperature, price) o Variable Y meaning (%WMax, PF, price, Volt-VAR array, charge/discharge gradient, VarAval)  Schedules contain X-Y values o X value as defined by its meaning o Y value as defined by its meaning o Repetition flag (none, daily, weekly, monthly, weekdays, weekends) o Random time window and ramp time o Number of active entries in schedule

19 Current Status (2/01/12)  Two working documents: Word doc with explanatory text and spreadsheet with Modbus map details.  Working group meeting weekly (8am PST, Wednesdays).  Completed first pass of proposed Modbus map and explanatory document.  Ready for review by an extended technical audience.

20 Questions

21 Bill Randle AE Solar Energy Headquarters Brinson Blvd Bend, OR


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