Tag: bi-directional

How is a Battery Emulator Different from Power Supplies & Electronic Loads?

Battery Emulator vs. Power Supplies and Loads - NH Research (NHR)

Battery Emulators VS. Power Supplies & Electronic Loads

Battery emulators are bi-directional, whereas power supplies and loads are unidirectional devices. A power supply regulates voltage and expects some amount of current to be drawn. Electronic loads regulate current and expect voltage to be provided. Being uni-directional, these devices are unable to accept or supply power in the reverse direction.

An approach engineers often take is to build their own test setup using sources and loads. This can be challenging, and time consuming, and has many of the disadvantages of the common DC bus architecture described above. Typically, DC sources have a programmed response time of 10 to 100 ms, which is far too slow for today’s EV applications such as electric powertrains. For example, using a DC load to modulate power or provide a return path for back-EMF requires complicated software development, considerable integration and test time, and does not provide an accurate simulation of the battery’s internal resistance. Additionally, the load must consume power at all times, and since it is not regenerative, all of the power is dissipated as heat waste, increasing operating costs and creating uncomfortable work conditions.

Battery emulators maintain a positive DC voltage and can immediately accept or deliver current, allowing power to flow in either direction. More advanced battery emulators, like NHR’s 9300 Battery Emulator, allow further real- world simulation of battery characteristics by modeling the battery packs series-resistance (RINT).

The RINT Model: Accurately Simulating Battery Characteristics

The Internal Resistance (RINT) model provides a simulation of the battery’s internal chemical resistance, along with additional pack resistances created by internal connections, contactors, and safety components. The RINT model can be implemented with a true bi-directional source (Vocv) and a programmable series-resistance (Rs). This model is sufficient for understanding the major characteristics of battery-based resistances and pack resistances. While the number of mathematical models has increased, these more complicated models are used to understand the electro-chemical characteristics of batteries, the nuances of  which have little impact on the overall system when compared with the total resistance of the pack.

NHR’s battery emulators feature this equivalent RINT Model providing an electronically programmable “Battery Emulation” mode. As in a real battery, NHR’s battery emulators adjust the output voltage depending on the direction and amplitude of current flow.  This automatic adjustment of output voltage better simulates real-world battery pack characteristics especially when compared with common DC-bus and source/load simulation systems.

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Battery emulation is ideal for applications such as electric powertrain, fuel cell emulation, energy storage systems emulation, Solar PV inverter testing, DC Bus emulation, and more. For more information about key differentiators and technology considerations for battery emulation, please contact us.

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NHR Presents at Intersolar 2020: Managing the Impacts of Electrification on the Grid

Power Lines Field

NH Research Inc., (NHR) a leading provider of power testing instruments and systems for the automotive, renewable energy, energy storage, and critical-power markets, will be presenting at Intersolar North America 2020.

Martin Weiss, Product Director at NH Research, will present in a talk entitled, “Bi-directional Test Solutions to Manage the Impacts of Electrification on the Grid”. In this session, he’ll share test solutions used by the industry to evaluate electric loading profiles and use cases for EVs, micro-grid, V2G and energy storage applications. This presentation will also review key factors in selecting the right test solution and industry use cases.

NHR Presentation Track: Managing the Electricity Load on the Grid: The Role & Impact of Vehicle Charging
Event: Intersolar North America, 2020
Dates: Feb 4th from 3pm to 4:15pm
Location: San Diego Convention Center, Room 9

Presentation Description:

Bi-directional Test Solutions to Manage the Impacts of Electrification on the Grid

EV DC Fast Charging deployments are accelerating. The ability to simulate these loading profiles is critical for: validating sophisticated load management systems and assessing the impact on the grid. Regenerative bi-directional sources, grid simulators and battery emulators are the engineer’s tool for testing new power management systems, solar (PV), energy storage systems, EVs and DC fast chargers. These bi-directional capabilities are especially ideal for utility companies to test and understand the impacts of e-mobility and grid-tied devices (DG and V2G) on the grid. Simulating the bidirectional power flows to and from the grid substantially speeds up testing time and reduces energy costs.

Key Presentation Takeaways:

• Identify power test approaches for strategic load management & utility grid testing
• Learn about next gen technologies for simulating real-world conditions & load profiles
• Industry use cases

NHR’s flexible test solutions include: 9200 & 9300 bi-directional DC power, 9410 regenerative grid simulator, 9410 AC Source and 9430 4-Quadrant AC loads.

For more information, contact us at 949-474-3900 or visit: https://nhresearch.com.

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NHR’s 9300 Bi-directional DC Source Now Available with 600 V input Auto-Transformer for Canadian Market

High Voltage Battery Test System 9300 - NH Research, Inc. (NHR)NH Research Inc. (NHR), a leading provider of power testing instruments and systems, announced a 600 V input auto-transformer for one of its best-selling products, the 9300 series.

“NHR’s optional auto-transformer enables our customers with industrial applications in the Canadian market to easily plug into our 9300 high-performance platform. Our product development team carefully selected the 600 V input auto-transformer and supplier after evaluating safety, accuracy, speed and performance. This new solution has brought added value and confidence to our customers who have these power requirements.” said Peter O’Brien, VP of Sales & Marketing at NH Research.­

NHR’s 9300 Series is a regenerative, bi-directional DC source that can be used as a battery test system, battery emulator, or regenerative DC load. The innovative 9300 platform addresses the higher voltage and higher power test requirements for electric vehicles, aerospace and defense, renewable energy, and energy storage applications. This highly modular system can be scaled up to 2.4 MW in 100 kW building blocks, offering a wide operating envelope. Its dual voltage range of 600 V and 1200 V provides the flexibility and accuracy needed as higher voltage levels are required.

Battery test and battery emulation applications include battery modules/packs, fuel cells, ultra-capacitors, power electronics, battery chargers, electric powertrain and propulsion systems. Customers look to NHR for superior performance, ease of use, faster slew rates to match today’s technology, reduced testing time, improved safety, and energy savings.

For more information, visit our product page: NHR 9300 Series bi-directional DC source.

Contact us at sales@nhresearch.com for application consultation.

About NH Research
NH Research, Inc. (NHR) enables electrification by accelerating innovation, validation and functional test of today’s technologies. Backed by over 50 years of experience in power conversion and power supply test systems we provide world class test instruments and systems. Our solutions provide the performance, simplicity, and safety that engineers and researchers desire.

www.nhresearch.com

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