US20150207316A1 - Dc building system with energy storage and control system - Google Patents

Dc building system with energy storage and control system Download PDF

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Publication number
US20150207316A1
US20150207316A1 US14/421,914 US201314421914A US2015207316A1 US 20150207316 A1 US20150207316 A1 US 20150207316A1 US 201314421914 A US201314421914 A US 201314421914A US 2015207316 A1 US2015207316 A1 US 2015207316A1
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Prior art keywords
power
energy storage
storage device
bus
source
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Abandoned
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US14/421,914
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English (en)
Inventor
John Saussele
Oliver Norbert Steinig
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Robert Bosch GmbH
Bosch Solar Energy Corp
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Robert Bosch GmbH
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Priority to US14/421,914 priority Critical patent/US20150207316A1/en
Priority to US14/707,320 priority patent/US20150253789A1/en
Assigned to ROBERT BOSCH GMBH, Bosch Solar Energy Corp. reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STEINIG, OLIVER NORBERT, SAUSSELE, John
Publication of US20150207316A1 publication Critical patent/US20150207316A1/en
Priority to US14/810,803 priority patent/US9937810B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for DC mains or DC distribution networks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B15/00—Systems controlled by a computer
    • G05B15/02—Systems controlled by a computer electric
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for DC mains or DC distribution networks
    • H02J1/002—Intermediate AC, e.g. DC supply with intermediated AC distribution
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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    • H—ELECTRICITY
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    • H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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    • H02J3/14—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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    • H02J3/381—Dispersed generators
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    • H02J9/065—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads for lighting purposes
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    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
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    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
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    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
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    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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    • H02J2310/10—The network having a local or delimited stationary reach
    • H—ELECTRICITY
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    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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    • H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
    • H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
    • H02J2310/58—The condition being electrical
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    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S30/00—Systems supporting specific end-user applications in the sector of transportation
    • Y04S30/10—Systems supporting the interoperability of electric or hybrid vehicles
    • Y04S30/12—Remote or cooperative charging

Definitions

  • the present invention relates to advanced component technologies which may improve building energy efficiency.
  • FIG. 1 is a block diagram of one embodiment of a conventional AC reference system for comparison with the present invention.
  • the present invention is directed to a DC microgrid without an inverter.
  • the DC microgrid powers one or more DC powered devices, which can include lighting and cooling devices.
  • the DC microgrid offers more efficient use of DC power generated by a Photovoltaic (PV) array.
  • the DC microgrid is less expensive to implement than conventional PV systems and offers improved payback.
  • the DC microgrid enables use of less expensive DC powered devices.
  • the DC microgrid can employ the solar synchronized load and/or maximum power point tracking control features described in U.S. patent application Ser. No. 13/560,726 and U.S. patent application Ser. No. 13/749,604.
  • the PV array of the DC microgrid can be sized to provide an advantageous DC bus voltage range for more efficient Maximum Power Point Tracking (MPPT) control that is lower and/or narrower than conventional DC bus voltage ranges.
  • MPPT Maximum Power Point Tracking
  • the PV array can be sized to provide power within a predetermined range for advantageously balancing power production by the PV array and a utility grid.
  • the PV array can be sized to provide less than half the power demand, for example between 25-40% of the power demand.
  • the Direct Current (DC) Microgrid Building Energy Management Platform (DCMG-BEMP) of the invention offers significant benefits relative to conventional alternating current (AC) building systems in terms of reduced total cost of ownership (TCO) and increased energy security.
  • Conventional building-level power distribution systems suffer from AC-to-DC conversion losses in powering many common devices, as well as DC-to-AC losses when utilizing locally produced DC power, such as from renewable energy sources. For example, these conversions result in up to a 12% greater loss of energy between photovoltaic (PV) arrays and AC lighting loads, when compared to the DC microgrid of the present invention.
  • Typical PV systems also require all power to flow through unreliable and expensive grid-connected inverter hardware, which prevents the PV power from being used for mission-critical activities when the grid power is lost (blackout condition).
  • current AC building systems have limited or no ability to manage building peak power demands, which can lead to demand charges and further grid instability.
  • the DCMG-BEMP applies a novel approach to using mature, reliable DC technology and dynamically optimizing power sources, loads, and energy storage system interaction, minimizing TCO and reliance on grid-based electricity.
  • Economic modeling using the BLCC tool shows 15%-25% improvement in Savings to Investment Ratio (SIR) over 25 years for the DCMG-BEMP compared to equivalent AC systems.
  • SIR Savings to Investment Ratio
  • the present invention DCMG-BEMP provides increased energy efficiency, improved energy security, and a lower total cost-of-ownership compared to other approaches.
  • the invention may provide a DC microgrid configuration in which DC electrical energy is stored in order to power DC loads without being converted to AC electrical energy.
  • DC energy storage may be in the form of batteries, capacitors, flywheels, etc., although only batteries are shown in the drawings.
  • One primary advantage of using energy storage in the DC microgrid configuration is that the energy (e.g., backup power) may be utilized more efficiently by the DC loads when in the form of DC from the energy storage elements.
  • One reason for the higher efficiency is that there are no intermediate conversions from DC storage to AC and back to DC, as is typically done in buildings.
  • Energy storage elements may be incorporated into the DC power supply, making it effectively similar to an uninterruptable power supply (UPS) configuration.
  • energy storage elements may be connected independently to the DC bus.
  • at least one exemplary embodiment in the drawing includes a battery incorporated into a DC power supply, which is connected to an AC grid and is separate from a solar grid (e.g., a renewable DC energy power source.
  • An energy storage device may be directly connected to the DC bus, or may have intermediate DC/DC converters to optimize voltages and currents for charging/discharging.
  • An energy storage device may be charged from the grid through an AC/DC power supply, may be charged from other DC sources such as solar photovoltaic (PV), or may be charged by both of these methods.
  • PV solar photovoltaic
  • a relatively small amount of energy storage capacity in the DC microgrid may be used to meet the ninety minute emergency lighting requirement for U.S. buildings, without the need for dedicated emergency lighting circuits or distributed battery strategies, as is typical. For example, all the lights may be dimmed, and/or only a subset of the lights may be turned on, via software control, in order to meet the emergency lighting brightness requirement.
  • Using the DC power supply in the uninterruptable power supply (UPS) mode may enable the DC emergency lighting to be powered without adding any additional infrastructure to the building.
  • emergency lighting may require additional infrastructure such as separate AC or DC lighting circuits and battery systems.
  • the inventive arrangement may provide advantages such as lower cost, higher reliability, and flexibility to change which lights are turned on during emergencies, and which lighting levels are available during emergencies. These advantages may be realized exclusively via an inventive software configuration.
  • the thermal storage may be combined with the electrical energy storage to determine the “energy security”. For example, frozen food may stay frozen for some hours even when energy storage is depleted, which may provide enough protection until solar energy is again available in the morning. Further, the food may be frozen to a temperature several degrees below what is required for freezing, and thus the frozen food itself may effectively store energy.
  • DC thermal loads e.g., food refrigeration, building HVAC, hot water heating
  • the electrical loads in the building may be adjusted to adapt to the availability of stored energy, solar power, and the duration of the blackout (e.g., the duration of the loss of utility grid power). For example, in the first hour of a blackout occurring with full sunshine and full energy storage reserves, the lighting, ventilation, or other emergency loads may be kept at full power. However, as the duration of the blackout continues into the second hour with less sunshine available, the emergency loads may be operated at lower power levels in order to conserve stored energy. For example, lights may be dimmed, ventilation may be operated at lower speed, etc. Additional such adjustments may be made to the operation of the loads as the duration of the blackout becomes longer, and depending on the amount of solar energy available.
  • the duration of the blackout e.g., the duration of the loss of utility grid power
  • the building is more likely to remain in a usable state through more blackout scenarios, since short-term blackouts occur more frequently than long-term blackouts, and since weather conditions (e.g., amount of sun) may be very different during different blackouts.
  • weather conditions e.g., amount of sun
  • Energy storage which is primarily designed into the DC microgrid for use as backup may also be used for “demand response” purposes to help the utility company manage peak power demands.
  • the utility company may send an electrical signal or provide an incentive (e.g., time-of-day utility rates or demand charges) for the DC microgrid to use power from the energy storage and PV for DC loads rather than from the utility grid for a period of time, thus reducing the electricity demand on the utility grid during a peak period (“DC load-leveling”).
  • an incentive e.g., time-of-day utility rates or demand charges
  • the energy storage may be connected to a DC/AC inverter or bi-directional AC/DC converter which would allow the energy storage to also be used to offset peak demands from AC loads in the building or elsewhere on the AC utility grid (“AC load leveling”).
  • the DC microgrid may be configured to provide a combination of the above—DC load leveling and AC load leveling.
  • Energy storage in the DC microgrid may have the unique ability to be periodically tested by feeding some or all of the power for the DC loads from the DC energy storage for test purposes without affecting building functionality. For example, the lights may not blink during such testing. In other words, some or all power may be directed to flow from the DC energy storage to the DC loads during the test period, temporarily reducing or eliminating the power needed from the DC power supply, PV, or other energy source. During this test period, voltages and/or currents may be measured to validate the rate of discharge and determine the health of the storage system. Similarly, solar PV or another DC power source may be used to charge energy storage and determine health of the energy storage system from the charge rate.
  • Building energy storage elements in the DC microgrid also may be used as an energy supply for commercial electric vehicles used in and around a building or complex.
  • the batteries from electric fork-lifts may be used as part of the building energy storage while they are being charged on or off the vehicle, and the batteries from electric golf carts may be used as building energy storage, etc.
  • the above concept may also be used in a conventional AC connection to the building via a single or bi-directional AC/DC inverter.
  • the invention comprises a DC building electrical system including a DC power consuming device connected to a DC bus.
  • a source of DC power is connected to the DC bus and powers the DC power consuming device.
  • An energy storage device is connected to the DC bus and to a DC emergency load. The energy storage device powers the DC power consuming device in conjunction with the source of DC power, and powers the DC emergency load when no sources of power, or limited sources of power, (e.g., solar) other than the energy storage device are available to the DC power consuming device.
  • the invention comprises a DC building electrical system including a DC power consuming device connected to a DC bus.
  • a source of DC power is connected to the DC bus and powers the DC power consuming device.
  • An energy storage device is connected to the DC bus and to the motor vehicle. The energy storage powers the DC power consuming device in conjunction with the source of DC power, and powers the motor vehicle.
  • the invention comprises a DC building electrical system including a DC power consuming device connected to a DC bus.
  • a source of DC power is connected to the DC bus and powers the DC power consuming device.
  • An energy storage device is connected to the DC bus and powers the DC power consuming device in conjunction with the source of DC power.
  • a DC power control system selectively charges and discharges the energy storage device based on a current state of charge of the energy storage device and a predetermined target state of charge of the energy storage device.
  • the invention comprises a microgrid system arrangement including a photovoltaic array producing a DC voltage on a DC bus.
  • a DC power supply produces DC voltage on the DC bus from AC voltage received from a utility grid.
  • a DC power consuming device is connected to the DC bus.
  • a controller controls amounts of DC power provided to the DC bus by the photovoltaic array and by the DC power supply.
  • the invention comprises a DC building system employing an energy storage device, wherein the energy storage device, via a common power network, supplies DC power 1) powering DC building loads in combination with at least one other DC power source (e.g., a renewable energy DC power source or an AC grid); and 2) powering DC emergency loads for a predetermined period when no other power is available.
  • DC power source e.g., a renewable energy DC power source or an AC grid
  • the invention comprises a DC building system employing an energy storage device, wherein the energy storage device is used to power a mobile device used within the building (e.g., a vehicle such as a fork lift or a golf cart).
  • a mobile device used within the building e.g., a vehicle such as a fork lift or a golf cart.
  • the invention comprises a DC building system employing an energy storage device, wherein the DC building system includes a DC power control system that selectively charges and discharges the energy storage device during non-emergency periods based on a state of charge (SOC) of the energy storage device and a predetermined emergency SOC.
  • SOC state of charge
  • the invention comprises a DC building system employing an energy storage device, wherein the DC building system includes a DC power control system that charges the energy storage device using excess power available from a renewable energy DC power source.
  • the invention comprises a DC building system employing an energy storage device, wherein the DC building system includes a DC power control system that when a state of charge (SOC) of an energy storage device drops below a predetermined SOC: selectively adjusts a variable DC load so that a total load on a solar device is less than an available power of the solar device; and charges the energy storage device to above the predetermined SOC.
  • SOC state of charge
  • the invention comprises a DC building system employing an energy storage device, wherein the DC building system includes a DC power control system that when a state of charge (SOC) of an energy storage device drops below a predetermined SOC: controls a discharge rate of the of the energy storage device by selectively reducing or discontinuing operation of one or more variable DC loads based on a building ambient condition (e.g., amount of sunlight) and a corresponding predetermined building condition (emergency interior lighting level).
  • SOC state of charge
  • predetermined building condition emergency interior lighting level
  • the invention comprises a DC building system employing an energy storage device, wherein the DC building system includes a DC power control system that selectively reduces or discontinues operation of a variable DC load during emergency operation based on a duration of the emergency.
  • the invention comprises a DC building system employing an energy storage device, wherein the DC building system includes a DC power control system that charges the energy storage device by discontinuing power to a motor/generator and operating the motor/generator in a regenerative mode during which kinetic energy is converted to DC power.
  • the motor/generator may also directly power the DC loads from regenerative power, and provide all or part of the energy storage in the system.
  • FIG. 1 is a block diagram of one embodiment of a conventional AC reference system.
  • FIG. 2 is a block diagram of one embodiment of a core DC microgrid system architecture of the present invention.
  • FIG. 3 is a block diagram of one embodiment of an enhanced DC microgrid system architecture of the present invention.
  • FIG. 4 is a block diagram of another embodiment of an enhanced DC microgrid system architecture of the present invention.
  • FIG. 5 is a block diagram of one embodiment of a DC microgrid building energy management platform of the present invention.
  • FIG. 6 is a block diagram of one embodiment of a DCMG-BEMP including a phased installation plan of the present invention.
  • FIG. 7 is a block diagram of one embodiment of a DC building system of the present invention.
  • FIG. 8 is a block diagram of one embodiment of a DC power control system of the present invention.
  • FIG. 9 is a block diagram of one embodiment of a DC load control system of the present invention.
  • FIG. 10 is a block diagram of another embodiment of a DC power control system of the present invention.
  • the present invention may: 1) showcase the viability and optimize the performance of a building-level DC microgrid subsystem, 2) validate the efficiency improvements of DC-powered components relative to conventional AC components when powered by PV, 3) showcase the DC microgrid system's impact on energy security by providing backup power for mission-critical activities while minimizing the need for other backup energy sources, and 4) demonstrate the added value of energy storage in AC and DC load-leveling scenarios.
  • the invention provides a core DC microgrid which utilizes PV energy more effectively in common building loads.
  • Another embodiment includes storage which may dramatically increase energy security.
  • the DCMG-BEMP of the present invention addresses the limitations of current building electrical power distribution systems by implementing a separate DC electrical distribution microgrid and novel DC-based electrical loads. Directly utilizing DC power eliminates the multiple conversions (DC-AC and AC-DC) of typical AC systems. Most renewable energy production systems (solar, wind, etc.) are tethered to the utility grid and allow for no direct usage of the power produced.
  • the core DCMG-BEMP system architecture is designed to optimize the amount of renewable power used locally within the building. This core system also eliminates the expensive and unreliable grid-tie inverter.
  • the DCMG-BEMP is further differentiated from other DC microgrid applications by an Energy Management Gateway (EMG), which manages the integrated PV power production, DC loads, and DC sources to minimize the overall (grid and renewable) energy use and total cost of ownership (TCO).
  • EMG Energy
  • the system architecture simplifies building electrical wiring by significantly reducing wiring conduit runs, as many of the DC-based components are either roof- or ceiling-mounted (including the PV array, lighting, and ceiling-mounted ventilation fans), and can utilize existing AC wiring for DC power, making the system well suited to retrofit as well as new construction applications.
  • the DCMG-BEMP is suitable to many facility types, since lighting and HVAC are large energy users in most buildings. As such, the DC loads may be commercial high-bay lighting and a large industrial ceiling fan that improves HVAC system efficiency. This broad application base may allow market forces to realize economies of scale and further improve the cost-effectiveness.
  • a DCMG-BEMP of the invention may include three phases, as shown in FIG. 5 , which is a high-level system schematic. A detailed block diagram is shown in FIG. 6 .
  • a core DCMG-BEMP system is first integrated in Phase I, which includes a PV array, DC power supply, and a DC-based high-bay induction lighting system. This core system is relatively small and is sized to match the DC loads, such that all PV production is immediately used. The result is a simple and cost-effective solution that does not require a grid-tied inverter.
  • the core system may incorporate approximately 20 kW of PV depending on the amount of building loads that can be converted to DC, but (unlike the latter Phases) the core does not significantly enhance the facility's energy security.
  • Phases II and III build on the core system by adding additional PV generation and energy storage to dramatically enhance the facility's energy security and mission assurance during power outages.
  • the managed energy storage system also performs load leveling/peak load reduction under normal operation to reduce utility costs.
  • These phases require substantially more PV power, and the functionality of the grid-tie inverter is integrated into the storage system to upload excess PV and stored power to the grid.
  • a net metering agreement may allow for the uploaded energy to offset utility-supplied energy.
  • Phase II integrates a battery-based energy storage system, large-diameter DC-powered ceiling ventilation fans as an additional DC load, and added PV array capacity. Ceiling-mounted ventilation fans (e.g., 24 inch diameter) may be used as DC load, but a DC HVAC system, for example, may also be used.
  • the fan circulates air so the heated/air-conditioned air is uniformly distributed, and moving air provides more comfort to occupants.
  • the result is that the HVAC system can be set to a lower or higher temperature (depending on the mode), and/or operates less often, using less energy while maintaining occupant comfort.
  • Each fan requires 1.5 kW to operate (3 kW total for two fans), which is substantially less than the HVAC power reduction.
  • Use of large ventilation fans can reduce air conditioning energy consumption by 36%, reduce heating energy consumption by 20+ %, and elevated air speed from a large fan can increase productivity by 9% in non-air conditioned spaces.
  • Phase II integrates a battery energy storage system such as a Green Charge Networks (GCN) GreenStation battery storage system to provide emergency backup power to critical DC loads.
  • GCN Green Charge Networks
  • the GreenStation storage system may also demonstrate AC load-leveling features by actively using the system's energy storage capacity to level the building's demand for utility grid power when the system is not in emergency backup mode.
  • Phase III integrates an additional PV generation and increased battery capacity as well as an electric vehicle charging stations (EVCS).
  • EVCS electric vehicle charging stations
  • the DCMG-BEMP-connected EVCS further supports mission-critical activities by providing the ability to charge vehicles even during power outages, such that personnel mobility can be maintained throughout.
  • the Energy Management Gateway performs overall system management and interfaces with existing building network infrastructure (e.g., LonWorks) if needed.
  • the EMG provides maximum power point tracking (MPPT) algorithms that keeps the PV System operating at the highest possible efficiency regardless of weather and load conditions.
  • MPPT maximum power point tracking
  • the EMG together with the GCN GreenStation battery energy storage, also manages the solar-synchronized loads (SSL) function, including AC and DC load-balancing and load-shedding to reduce non-critical loads during periods of reduced PV power (without affecting critical lighting or other loads).
  • the EMG control software may be optimized and implemented to manage the DC power sources, lighting and fan systems, GreenStation energy storage, and EVCS via secure, wired connections.
  • Supplemental grid power is supplied to the DC microgrid via an AC-to-DC power supply when PV power alone is insufficient, and when stored power is being conserved.
  • Power flow is controlled by the EMG to optimize use of grid vs. solar vs. stored power.
  • the EMG-controlled power supplies respond instantaneously to attenuate “peak-to-valley” changes during rapidly varying solar energy production, such as during cloud-shading events.
  • the EMG also determines and manages times at which it is most effective to charge the battery system from the PV array and/or utility grid, as well as times at which it is most effective to export PV and/or stored power to the building's other AC loads. The result minimizes grid-based energy and power demands and maximizes renewable energy usage.
  • the GreenStation's battery energy storage system's energy-buffering capability also enables the Phase III EVCS installation to be done without “last-mile” grid upgrades, thus reducing costs.
  • the invention may provide a modular, scaleable, and optimized DCMG-BEMP system flexibly designed for broad commercial applications.
  • An efficient DC infrastructure and EMG-managed device connectivity is an important DCMG-BEMP feature, as it enables simplified DC microgrid “islanding” for off-grid operation. Islanding of the DC microgrid allows critical loads to be unaffected during blackouts by using PV and/or stored energy. High-priority loads such as lighting are reduced according to the facility's emergency-mode requirements while lower-priority loads are allocated energy as it becomes available. As a result, the reliance on other backup power sources is eliminated or significantly reduced. This islanding capability is unique to the inventive system and an ideal fit for providing backup power at mission-critical facilities and emergency shelters.
  • a programmable emergency power mode may be integrated into the EMG to manage tradeoffs between building lighting and ventilation levels, battery storage capacity, and weather effects.
  • the induction lights (Everlast), PV panels (Bosch), GreenStation (GCN), and DC power supply (Emerson) are all UL-certified commercial units in serial mass-production.
  • the equivalent DC version of the Everlast induction light (e.g. ballast, light, enclosure) may also be UL certified.
  • the EMG may either be an off-the-shelf solution (e.g. Tridium) or may utilize mature software platforms (Visual Rules and Inubit) operating on UL-certified hardware.
  • the large commercial ceiling fans (Delta T Corp) are mass-produced. The fans are AC-powered, but utilize variable frequency drives (VFD) that operate internally on DC power.
  • VFD variable frequency drives
  • Either the DC circuits of the existing VFD may be utilized, or the VFD may be replaced/supplemented with a commercially available DC-input device.
  • the complete DC fan unit may be UL certified and added in Phase II.
  • a commercially available EV fast-charging station e.g. Eaton DC Quick Charger
  • the charger may have an AC interface with the GreenStation. Integrating the EV fast charging station with a DC connection to the GreenStation may maximize the microgrid's benefits and capabilities.
  • the present invention may:
  • the DCMG-BEMP may effectively reduce overall total cost of ownership for a building, maximize the use of renewable PV energy production to minimize grid-supplied energy, improve the energy-security and backup-power capabilities relative to conventional AC infrastructure, and demonstrate the added value of energy storage for building load leveling and peak load reduction.
  • Phase I may include the following:
  • the ideal DCMG-BEMP system site is a large, high-ceiling building (such as a warehouse, gymnasium, commissary, vehicle maintenance garage, aircraft hangar, etc.) that can accommodate a PV array and high-bay lighting.
  • the ideal facility would also be used as an emergency shelter.
  • the ideal building has a large roof, seven-days-a-week operation, and an electrical consumption pattern generally aligned with the PV system's energy production. Daily operation is critical because PV array in the core system is sized to directly power the lights, eliminating the need for a grid-tie inverter to feed power back into the grid.
  • the DCMG-BEMP and EMG are flexible, scalable technologies that optimize energy use in all climate zones and building sizes, from small structures up to entire clusters of buildings.
  • a data acquisition system may be installed to collect electricity usage data for system components as well as the whole facility to characterize the baseline utilization profile. These data sets may be analyzed to determine the baseline system performance, including daily, monthly, average monthly, and annual energy usage (kWh and MMBtu), electricity demand (kW), and demand charges ($), as well as the frequency of utility grid failure events (i.e. blackouts). This information may also be used to optimize the EMG control software for the demonstration site's operating characteristics.
  • Operating and Maintenance Costs Historical maintenance and replacement costs (including parts and labor) may be collected and analyzed to determine typical, annualized equipment-maintenance costs. This information may be used within the DCMG-BEMP system's cost-effectiveness and payback calculations.
  • Light Output Test An evaluation of floor-level lighting may be done using a handheld light intensity meter. Data points may be taken along a virtual grid across the gymnasium floor to capture any potential variations. The test may be performed once to quantify the induction lighting's output goal (Task PI-3).
  • Task PI-3 Phase I System Integration Design and Installation
  • the Phase I system may be segmented into two subsystem circuits: (1) the core DC system (min. 20 light fixtures), and (2) a smaller reference AC system (4 light fixtures) that may serve as a control to determine the DC system's reduction in lighting power consumption.
  • This AC system may allow for energy usage comparisons in validating the DCMG-BEMP system's performance.
  • This reference system requires the addition of a PV inverter to provide energy to the AC-powered lights.
  • the Phase I system includes installation of: (1) a 30 kW rooftop solar PV array, (2) an Emerson NetSure 4015 System 30 kW, 400 V AC-DC power supply, (3) a Bosch Energy Management Gateway, (4) a Solectria 10 kW PV inverter, (5) min 24 Everlast EHBUS-RC 250 W induction lights (20 DC-powered and 4 AC-powered), and (6) the required electrical wiring.
  • a lighting study was completed to determine the number and power rating of the induction lights.
  • the current 400 W metal-halide light fixtures may be replaced, with wiring reused wherever possible. Understanding how existing AC wiring can be reused for DC circuits is very important for future retrofit applications.
  • the design may meet current electrical codes and standards, as well as Fort Bragg's design guidelines. All of the components used may be UL certified.
  • FIG. 6 provides a system schematic, including the phased installation plan for the major hardware elements. This phased installation approach ensures that sufficient capacity is available for each phase, while evening out monetary expenditures.
  • Task PI-4 Phase I DCMG-BEMP Operation, Data Collection, and Analysis
  • the DCMG-BEMP system may be operated to collect electricity usage data. Data collection may continue to ensure that seasonal changes are accurately captured.
  • the EMG may serve as a data acquisition system, recording the energy and power usage throughout the demonstration. Since electrical demand charges are typically defined as the highest average 15-minute peak power in a given billing cycle, the data acquisition algorithm may be flexible to capture regular interval data (e.g. 1-second or 5-second data).
  • the same data parameters used for baseline system analysis may be collected in this task, including energy usage (kWh and MMBtu) and demand (kW) data. This data and non-electricity utility statements (e.g.
  • DCMG-BEMP system's performance including daily, monthly, average monthly, and annual energy usage (kWh Total , kWh Grid-Supplied , and MMBtu), renewable energy usage (kWh), electricity demand (kW Total and kW Grid-Supplied ), and demand charges ($).
  • Phase II may include the following:
  • the fan can reduce the heating and cooling loads of the current HVAC system, thus saving energy.
  • Additional energy security may be offered by adding a GCN GreenStation with 32 kWh of battery storage, as well as 35 kW of PV. Specifically, the amount of backup time available during a blackout at different emergency lighting levels and various weather conditions may be increased.
  • the load-leveling capabilities may be offered by linking the GreenStation to the building AC circuits, offering the ability to compensate for wide, rapid variations in PV power generation and building loads (from HVAC, etc.) by discharging and charging the battery storage appropriately.
  • the DC fan's speed can be varied to match the amount of PV power available (on a daily, seasonal, and/or weather-influenced basis) to further level the building load profile.
  • Task PII-1 Phase II System Integration Design and Installation
  • Phase II system builds on the Phase I system by adding: (1) 35 kW of rooftop solar PV array capacity (65 kW total), (2) a 32 kWh GCN battery storage system, (3) two 24 inch-diameter ventilation fans, and (4) EMG modifications.
  • the draft SOW includes the installation upgrade plans for these components.
  • the same installation subcontractors used in Phase I may be used in both Phase II and Phase III.
  • Task PII-2 Phase II DCMG-BEMP Operation, Data Collection, and Analysis
  • Phase III may include the following:
  • Additional energy security may be offered by increasing the GCN GreenStation capacity to a total of 96 kWh of battery storage and 70 kW of PV. Specifically, the amount of backup time available during a blackout at different emergency lighting levels, demonstrated under various weather conditions may be increased.
  • Additional load-leveling capabilities may be due to the increased GreenStation capacity.
  • the EVCS can continue to be used during an emergency blackout scenario by utilizing PV and stored energy, further increasing the energy security of the demonstration site.
  • a battery storage system and EVCS with DC connectivity offers the same functionality as the current AC-powered scenario, while offering improved efficiency during backup and charging operations.
  • Task PIII-1 Phase III System Integration Design and Installation
  • the Phase III system builds on Phase II's system by adding: (1) 35 kW of rooftop solar PV array capacity (100 kW total), (2) an additional 64 kWh of GCN battery storage (96 kWh total), (3) a fast-charge EVCS, and (4) EMG modifications.
  • the draft SOW includes the installation upgrade plans for these components.
  • Task PIII-2 Phase III DCMG-BEMP Operation, Data Collection, and Analysis
  • System Performance Analysis The same data parameters used in baseline system analysis, Phase I, and Phase II may be collected in this task, including energy usage and demand data. This data and non-electricity utility statements may be analyzed as detailed above (in the System Performance Analysis of Task PI-4) to determine the DCMG-BEMP system's performance under Phase III operation.
  • control algorithms are developed such that, if a code failure occurs, the system may fail in a way that allows DC devices to be powered from the grid to ensure building loads are not interrupted.
  • the battery system is not in the critical path of electrical energy transfer (i.e., from the DC power supply and PV array to the lighting system), so building functions may continue to operate normally even as the battery's capacity decreases throughout its lifetime.
  • the energy storage system may be tested periodically without affecting building functionality; any faults or reductions in capacity may be reported accordingly.
  • the installation assumes that the existing AC wiring can be reused for the majority of the DC microgrid wiring. If this is not possible, separate DC wiring runs may be needed (requiring additional installation hardware and labor, permitting/inspections, etc.).
  • the ability to island the facility from the utility grid during a power outage or an emergency is an inherent DCMG-BEMP feature, as it does not require a grid-tied PV inverter. Islanding allows the building's DC loads to continue functioning during such events, enhancing the facility's energy security. Depending upon building application, the emergency power mode may reduce or eliminate the need for backup generators (and their associated fuel usage).
  • the inventive system is scalable and ideally suited to large, flat-top buildings with high-bay lighting.
  • the ceiling fan may be an appropriate DC load to complement DC lighting (or standalone) in the inventive DC microgrid.
  • the ceiling fan is a load that inherently synchronizes very well to the solar PV generation, and can also be varied in speed to match the desired load conditions (for example, to help get the system to maximum power point (MPP) of the PV at any exact moment).
  • MPP maximum power point
  • the DC fan's speed can be varied to match the amount of PV power available (on a daily, seasonal, and/or weather-influenced basis) to further level the building load profile.
  • Ceiling fans are especially well suited to PV power generation because they generally run at a higher speed in summertime (to help cool building occupants, allowing a higher air-conditioning thermostat setting, overall saving HVAC energy cost), and run at a lower speed in wintertime (just to bring hot air from the ceiling down to the floor level where the occupants are, allowing the heating system to run less often, with less heat loss through the ceiling, overall saving HVAC energy). This can be done in the same rotational direction winter/summer or reversing directions with season (typically blowing air down in summer).
  • This synchronization can also be coordinated with the other building loads, and especially in the DC case can be part of a system-level PV power point tracking system which would keep the PV operating at the optimum power point for the current situation.
  • AC fan load or DC fan load consuming locally generated PV energy locally in the building loads whenever possible results in lower economic and energy losses which may be associated with consuming power from the utility grid that is generated remotely, and associated with sending excess PV power out to the grid, only to have a need for that same PV energy in the building loads at a later time.
  • FIG. 7 illustrates a DC building system 700 including a renewable energy DC power source in the form of a solar device 702 whose output is connected to a DC bus 704 .
  • DC power supply 706 may include an energy storage device in the form of a battery 708 , a DC/DC converter 710 , an AC/DC inverter 712 , and a processor in the form of a controller 714 .
  • DC power supply may encompass any device that provides DC electrical energy converted from another form of energy, such as AC electrical energy, or chemical energy in the case of a battery.
  • Both solar device 702 and DC power supply 706 may provide DC electrical power to DC bus 704 .
  • An AC grid 716 may provide AC power to DC power supply 706 , which AC/DC inverter 712 may convert to DC power.
  • DC power consuming devices or variable DC loads in the form of DC lights 718 , DC thermal device 720 , and DC fan 722 may draw DC power from DC bus 704 .
  • DC fan 722 may include a motor or generator that is capable of operating in a regenerative mode.
  • FIG. 8 illustrates a DC power control system 800 including a renewable energy DC power source in the form of a solar device (e.g., a photovoltaic array) 802 whose output is connected to a DC bus 804 .
  • Solar device 802 and DC bus 804 are in communication with a source of DC power in the form of a DC/DC converter 810 and an AC/DC inverter 812 , and with a processor in the form of a controller 814 .
  • An energy storage device in the form of battery 808 may provide DC power to DC bus 804 .
  • Solar device 802 , battery 808 , and an AC power source in the form of an AC grid 816 may supply DC electrical power to DC bus 804 .
  • AC/DC inverter 812 may convert AC power supplied by AC grid 816 to DC power.
  • DC power consuming devices or variable DC loads in the form of DC lights 818 , DC thermal device 820 (e.g., a freezer), and DC fan 822 may draw DC power from DC bus 804 . Accordingly, it will be appreciated that the DC power consuming devices or variable DC loads can receive power from one or more of solar device 802 , battery 808 , and AC grid 816 via a common power distribution circuit (not shown).
  • DC fan 822 may include a motor or generator that is capable of operating in a regenerative mode.
  • one or more energy storage elements 824 may be connected independently and/or directly to DC bus 804 .
  • FIG. 9 illustrates a DC load control system 900 which may be incorporated into DC building system 700 and/or DC power control system 800 . Accordingly, DC load control system 900 will be described with reference to components of power control system 800 .
  • DC load control system 900 includes a second controller 902 interconnecting DC bus 804 and DC power consuming devices or variable DC loads in the form of DC building lights 918 , DC thermal device 920 , and DC fan 922 . Each of these variable DC loads may draw DC power from DC bus 804 .
  • DC building lights 918 may include emergency lights 924 and other lights (e.g., non-emergency lights) 926 . Emergency lights 924 may draw less power than the entirety of DC building lights 918 and may be a subset of DC building lights 918 .
  • Emergency lights 924 and DC fan 922 may function as DC emergency loads which operate when neither solar device 802 nor the other sources of DC power 810 , 812 are operable.
  • energy storage device 808 may power each of the DC power consuming devices 918 , 920 , 922 in conjunction with solar device 802 and the other sources of DC power 510 , 512 under normal non-emergency operating conditions.
  • energy storage device 808 may power the DC emergency loads 922 , 924 for a predetermined period of time when no source of power other than the energy storage device 808 is available to the DC power consuming devices 918 , 920 , 922 .
  • Second controller 902 may respond to solar device 802 and the DC power supply 810 , 812 being inoperable for a threshold length of time by reducing a level of power drawn by at least one of the DC power consuming devices 918 , 920 , 922 .
  • DC fan 922 may operate at a slower speed in an emergency mode than in a non-emergency mode.
  • emergency lights are the same as non-emergency lights, but the lights draw less power and are dimmer in an emergency mode than in a non-emergency mode.
  • the emergency lights are a subset of the non-emergency lights.
  • Controller 714 and/or controller 814 may function as a DC power control system which charges the energy storage device during time periods in which the source of DC power is operable, and which discharges the energy storage device during time periods in which the source of DC power is inoperable.
  • the charging and discharging may be based on a current state of charge (SOC) of the energy storage device and a predetermined target SOC of the energy storage device. For example, charging of the energy storage device may take place only if and/or whenever the current SOC or voltage level of the battery is below a desired target SOC or voltage level of the battery. Discharging of the energy storage device may take place only if and/or whenever the current SOC or voltage level of the battery is above a desired target SOC or voltage level of the battery.
  • SOC state of charge
  • the predetermined target SOC may be a state or level of charge or voltage that is sufficient to solely power at least one of the DC power consuming devices for a predetermined duration of time while the source of DC power is inoperable (e.g., during a lightning storm).
  • the DC power control system 800 may charge the energy storage device 808 by using excess power from the renewable energy DC power source 802 .
  • the DC power control system 814 may respond to the current SOC of the energy storage device dropping below the predetermined target SOC by adjusting at least one of the variable DC power consuming devices 818 , 820 , 822 such that a level of current drawn by the variable DC power consuming device 818 , 820 , 822 is less than a level of current sourced by the renewable energy DC power source 802 , and such that the energy storage device 808 is charged to the predetermined target SOC by the renewable energy DC power source 802 .
  • the DC power control system 800 may respond to the current SOC of the energy storage device 808 dropping below the predetermined target SOC by adjusting a discharge current rate of the energy storage device 802 by selectively reducing or discontinuing operation of at least one of the variable DC power consuming devices 818 , 820 , 822 dependent upon a building ambient condition and/or a corresponding predetermined building condition.
  • the building ambient condition includes a level of sunlight.
  • the corresponding predetermined building condition includes a desired emergency interior lighting level.
  • DC power control system 800 selectively reduces operation or discontinues one or more of DC lights 818 such that a level of light provided by DC lights 818 supplements the level of sunlight to meet the desired emergency interior lighting level. In this way, DC power control system 800 can control a discharge rate of battery 808 and, more particularly, can reduce the discharge rate by lowering a number of the DC lights 818 operating to meet the desired emergency interior lighting level.
  • the DC power control system 800 may respond to the source of DC power 810 , 812 being inoperable for a threshold period of time by adjusting at least one of the variable DC power consuming devices 818 , 820 , 822 such that a level of current drawn by the variable DC power consuming device 818 , 820 , 822 is thereby reduced. Moreover, the DC power control system 800 may selectively reduce or discontinue operation of at least one of the variable DC power consuming devices 818 , 820 , 822 dependent upon a length of time during which the source of DC power 810 , 812 has been inoperable.
  • the DC power control system 800 may charge the energy storage device 808 by discontinuing power to the motor or generator of the DC fan 822 and by operating the motor or generator in a regenerative mode in which kinetic energy of the motor or generator is converted to DC power.
  • the DC power control system 800 may control amounts of DC power provided to the DC bus 804 by the solar device 802 and by a DC power supply 810 , 812 that is fed by the AC grid 816 .
  • the DC power control system 814 may control how much power is provided by the solar device 802 and how much power is provided by the DC power supply 810 , 812 dependent upon how much power is needed by the DC power consuming devices 818 , 820 , 822 , the cost of the AC power from the grid 816 , how much power is available from other sources, such as an energy storage device 808 , a motor operating in a regenerative mode, etc.
  • FIG. 10 illustrates another embodiment of a DC power control system 1000 which may be substantially similar to DC power control system 800 , except that system 1000 additionally includes a mobile device in the form of a motorized vehicle 1028 powered by battery 1008 .
  • DC power control system 1000 includes a renewable energy DC power source in the form of a solar device (e.g., a photovoltaic array) 1002 whose output is connected to a DC bus 1004 .
  • Solar device 1002 and DC bus 1004 are in communication with a source of DC power in the form of a DC/DC converter 1010 and an AC/DC inverter 1012 , and with a processor in the form of a controller 1014 .
  • An energy storage device in the form of battery 1008 may provide DC power to DC bus 1004 .
  • Both solar device 1002 and the DC power supply may provide DC electrical power to DC bus 1004 .
  • An AC grid 1016 may provide AC power to the DC power supply, which AC/DC inverter 1012 may convert to DC power.
  • DC power consuming devices or variable DC loads in the form of DC lights 1018 , DC thermal device 1020 (e.g., a freezer), and DC fan 1022 may draw DC power from DC bus 1004 .
  • DC fan 1022 may include a motor or generator that is capable of operating in a regenerative mode.
  • one or more energy storage elements may be connected independently and/or directly to DC bus 804 .
  • Motorized vehicle 1028 may be in the form of a golf cart or a fork lift, for example.
  • the energy storage device may power the DC power consuming devices in conjunction with the solar device and the other source of DC power, and may also power the motorized vehicle.
  • battery 1008 may substantially simultaneously perform both functions of providing emergency power for emergency loads when the solar device and the other source of DC power are inoperable, and being the exclusive source of power for a motorized vehicle.
  • the present invention may encompass embodiments in which ceiling fans or other motor loads act in a regenerative braking mode as all or part of the energy storage to power the lights directly. That is, the regeneration may not necessarily charge other batteries in the system. In other words, if there are no batteries in the system, the fans slowing down could keep supplying power to the DC lights when the grid is lost. This method may help fill-in power when a cloud passes and suddenly solar power is lost. This may increase the life of the DC power supply because the DC power supply does not have as large of a power surge due to sudden clouds if the fan motors help supply even a small amount of energy storage.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (AREA)
  • Automation & Control Theory (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Electromagnetism (AREA)
  • General Engineering & Computer Science (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Direct Current Feeding And Distribution (AREA)
US14/421,914 2012-08-16 2013-08-16 Dc building system with energy storage and control system Abandoned US20150207316A1 (en)

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US14/707,320 US20150253789A1 (en) 2012-08-16 2015-05-08 DC Building System With Energy Storage and Control System
US14/810,803 US9937810B2 (en) 2012-08-16 2015-07-28 Charging and discharging of DC microgrid energy storage

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US201261699169P 2012-09-10 2012-09-10
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US14/810,803 Continuation-In-Part US9937810B2 (en) 2012-08-16 2015-07-28 Charging and discharging of DC microgrid energy storage
US14/855,755 Continuation-In-Part US10020656B2 (en) 2012-08-16 2015-09-16 Emergency load management using a DC microgrid during grid outage

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US14/810,803 Active 2034-06-06 US9937810B2 (en) 2012-08-16 2015-07-28 Charging and discharging of DC microgrid energy storage
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US14/855,755 Active 2034-04-24 US10020656B2 (en) 2012-08-16 2015-09-16 Emergency load management using a DC microgrid during grid outage

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