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Resilient solar+storage+EVcharging microgrids

What is a microgrid?

An integrated energy system consisting of interconnected loads and distributed energy resources which can be controlled as a single entity operating in parallel with the grid and/or in an intentional islanded mode.

Benefits

Reliable Energy

  • Ability to proactively “island" from utility
  • Preserve critical loads 24/7/365
  • Repurpose grid tied inverters for island mode operation
  • Determine root cause of outages and restore power quickly

Efficiency & Optimization

  • Minimize energy costs through fuel switching and energy savings
  • Harness combined heat and power, maximize incentives
  • Prioritize critical loads
  • Monetize energy flexibility with the grid

Green Energy

  • Incorporate low cost solar, low emission DER
  • Implement net-zero projects
  • Reduce green house gases

How can a solar+storage+EVcharging microgrid pay for itself?

Self-funded solar+storage+EVcharging by ISO & utility programs:

All we need is the chosen site’s 12-month 15-minute interval data in kW, kWh & tariffs to do a financial analysis

1. Financial analysis: historical usage modeling

Step 1: Understand current onsite Cost of Energy and consumption profile by analyzing bills, tariff structure, and interval consumption data 

  • Integrate electricity supply/delivery tariffs with the load profile into Homer
  • Create graphical representation of current cost of energy

2. Financial analysis: costs of solar+storage plus energy/power costs

Step 2: Estimate the value of PV + ES by economic optimization

  • Integrate the CAPEX of PV+ES at this site, informing the model of the value of PV+ES

Step 3: Sizing of PV + ES + other components of the system

  • Optimization based on the value of PV+ES to get value to get optimized energy/power values
  • If site includes resiliency or ancillary services, requirements loaded into Homer

Step 4: Solve for the future cost of energy/power onsite

  • Integrate electricity supply/delivery tariffs with PV+ES with the site load profile into Homer
  • Homer outputs annual savings of energy/power with PV+ES

3. Financial analysis: paybacks with ISO & utility programs

Step 5: Demonstrate savings from microgrid by loading data into pro-forma

  • Integrate the CAPEX of PV+ES at this site, informing the model of the value of PV+ES

Step 6: Estimate the value of ancillary services

  • Utilization of the battery is checked to account for savings/ancillary services and avoid double counting
  • Ancillary services are then brought into the Financial Pro-Forma

Energy storage applications

Renewable Energy Generation

Renewable Energy Shifting and Firming

Charge the battery with excess of renewable energy during off-peak periods to release it onto the grid during peak periods, and possibly to follow a pre-defined generation pattern

Renewable Energy Smoothing

Charge/discharge the battery to smooth intermittent generation and follow soft power injection ramps.

Large End-Users

Electricity Rate Optimization

Store electricity when the market price is low and consume it when the market price is high

MicroGrids, Diesel Abatement

Use storage in isolated grids in conjunction with renewable energy and fossil fuel sources

Power Transmission and Distribution

Ancillary Services

Provide or absorb active power (respectively reactive power) in order to keep the grid frequency (respectively the grid voltage) within allowed boundaries 

Peak Shaving

Charge the battery with excess of renewable energy during off-peak periods to release it onto the grid during peak periods

Investment Deferral

Store Energy close to consumers during off-peak  periods and release it during  peak periods to avoid having to re-invest in new transmission or distribution lines

Complete portfolio for holistic care

Microgrid inclusions

Planning

  • Financial, Regulatory and Power Systems Feasibility
  • Full Power Systems design for Microgrid and Interconnection
  • Licensed in all 50 states
  • Full Power Systems design for Substation/Feeder Area of Distribution network to incorporate 1 or many microgrid and DERs
  • Incorporation of the MG/DERs into the Control Center Operating procedures

Equipment for MG and Distribution System

  • SE Square D Metalclad MV Breakers or Selected Vendor Switchgear (S&C partner)
  • Square D Low Voltage Switching, Controls, Motor Operators
  • Nulec Reclosers or Selected Vendor Reclosers
  • ION Power Monitoring/Quality/Revenue Metering
  • Automation Servers, RTUs, PLCs, Protective Relays, IEDs
  • Building Management Systems (BMS)
  • ArcFlash Mitigation Solutions for all apparatus
  • Smart Inverters (Conext)
  • ViZn Battery Energy Storage Systems

IT/OT Integrated Software Platforms

  • Demand Side Operations (DSO) for 1-n Sites
  • PowerScadaExpert (MG SCADA) for 1-n Sites
  • Advanced DMS (ADMS) and DSCADA Platform for Utility Control Center
  • DCS for larger Generation Facilities
  • Asset Monitoring (PRiSM)
  • Time Series Historian (eDNA)
  • Weather Information Services (Weather Sentry) for Utility Control Center and Sites
  • Demand Response Platform

Service

  • Installation, integration, testing, commissioning and/or EPC
  • Program Management, IT/OT Integration with Control Center
  • Maintenance and extended services in the field

Microgrid controller & event management

Solar+Storage demand side ops

  • Ease of Operation
    • Automation and optimization of when to consume, produce, store, or sell energy using the best intelligence
  • Remote monitoring of DER
  • Save money while increasing comfort
  • Be greener
  • Contribute to the grid stability (DR) while earning revenue

Multi-level DER box controls

Microgrid Controller

  • Reactive management of DER (ms, s, minute)
  • Dispatches orders and collects DER data
  • Data storage for improving reliability
  • Management of Islanding Disconnection/Reconnection to the Grid
  • Black start capability
  • On demand use case development

Demand Side Operation Hardware

  • Predictive management of DER (minute, hour, day forecast)
  • Weather and Load Forecast information
  • Interaction with third party actors (utilities, commercial aggregators etc)

Typical architecture

Schneider Electric solutions include everything you need to efficiently control the energy flows between the energy storage component and the point of interconnection

Our offer includes everything from the DC protections and power conversion, to the grid-tie substation; monitoring & control systems and
long-term service contracts

Bi-directional inverters for utility scale battery storage charge/discharge

XC ES

  • Certified to EN50178, EN61000-6-2 and EN61000-6-4
  • Indoor rated, wide range of full power operation from -10°C to 45°C
  • Best in class efficiency:
    • Inverting mode: 99.1% peak, 98.5% Euro
    • Rectifying mode: > 97.5

XC-NA ES

  • Certified to UL1741 (including IEEE 1547)
  • Outdoor rated, wide range of full power operation from -20°C to 50°C, with -35°C option
  • Best in class efficiency: Inverting mode: 99.1% peak, 98.5% Euro
    • Inverting mode : 98.6% peak, 98% CEC
    • Rectifying mode : > 97.5%

Common Features

  • Based on PV inverter à Scale effect, easier servicing
  • Field proven with more than 2 GW installed in PV power plants in the harshest environments
  • Full 4-quadrant operation to provide active and reactive power support
  • Full suite of automatic and interactive grid support features: VRT, P(f) * drooping, Q(V) ** drooping, P and Q control via both PF (power factor) and P/Q references, power ramping
  • Fast Response Transient time for mode reversal (active power sinking/sourcing) < 5 msec to support all applications

Different methods & options enable installation in all geographies and environmental conditions…

ES box ST+

  • 540kVA to 2.04MVA
  • For Conext Core XC ES inverters
  • IEC 62271-202 compliant
  • Containerized, optimized to reduce the cost of long haul shipment by sea or rail
  • 3 compartments: low voltage, transformer and MV switchgear
  • 2 doors in the LV compartment to comply with most stringent Occupational Health & safety rules
  • Optional integrated filtering units for desert, coastal, or tropical environments

Outdoor skid-mounted solution

ES Skid

  • 1 to 2MVA substation
  • For Conext Core XC-NA ES inverters
  • NEC compliant design
  • Integrated utility scale storage solution
    • Power conversion DC to AC
    • Electrical protection
    • Voltage increase from LV to MV
    • Monitoring and Control

What is a Flow Battery?

Long proven history of safe, resilient & certified zinc/iron flow batteries:

  • 8 Years of USDOE & NASA research followed by
  • 8 Years of ViZn commercialization
  • ISO 9001-2008 certified manufacturing facilities
  • Idaho National Lab customer specializing in vulnerability assessments & infrastructure resiliency for electric grid reliability, control systems, cybersecurity and physical security systems.

What’s Inside a ViZn Flow Battery?

  1. Anolyte: Zinc Oxide
  2. Catholyte: Yellow prussiate of soda
  3. Alkaline solution: KOH and NaOH

How is it made?

  1. Safe electrolytes blended
  2. Local tap water onsite
  3. Alkaline solution

Shedd Aquarium, Chicago, USA

Frequency Regulation in the PJM wholesale electricity market

Goal

  • Skid with XC-NA ES inverters, 1MW / 500kWh
  • Li-On batteries provided by Eagle Picher

What’s next?

Steps to success

  1. 12-month 15-minute interval data in kW, kWh & tariffs to do a no-cost financial analysis
  2. Investment-grade audit & electrical engineering study

View the full report