Oztek Blog

Using Modbus to Communicate with Multiple OZpcs-RS40s

Posted by Dave Zendzian on Mar 3, 2021 8:43:13 AM

The OZpcs-RS40 is a 40kW Power Conversion System (PCS) intended for battery-based energy storage applications. The PCS is designed to be mounted in a standard 19” rack, and easily paralleled to scale power capability. All hardware interfaces are located on the front panel, utilizing pass-through type terminal blocks for simple daisy chained cable or bus bar power connections. Similarly, the Modbus and digital I/O signals are provided on redundant, high density, 15-pin D-Sub connectors, which also allow for simple daisy chain cabling. When using Modbus to control multiple, paralleled PCS there are several things to consider, including termination, addressing, and broadcast messaging.

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Topics: Grid Tie Inverter, Digital Power Control, energy storage, MODBUS, Smart Inverter, UL1741-SA

Frequency/Watt Smart Inverter Functionality

Posted by Dave Zendzian on Feb 1, 2021 12:02:05 PM

In a previous post, I discussed how the Volt/VAR function can be used to provide grid voltage stabilization during over and under-voltage conditions. In addition to stabilizing out of tolerance voltage conditions, over and under-frequency grid conditions can also be mitigated using Frequency/Watt functionality. In a manner similar to Volt/VAR, the Frequency/Watt function will automatically generate real power commands based on grid frequency measurements.

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Topics: Grid Tie Inverter, Digital Power Control, energy storage, Smart Inverter, UL1741-SA

Volt/VAR Smart Inverter Functionality

Posted by Dave Zendzian on Dec 23, 2020 4:41:47 PM

To support grid voltage stabilization during over and under-voltage conditions, UL1741 certified smart inverters, such as the OZpcs-RS40, can be configured to automatically absorb or inject reactive power based on grid voltage measurements. This behavior is commonly referred to as Volt/VAR control and is implemented using a configurable array of points, that when combined, define a linear, piece-wise curve that results in the desired Volt-VAR behavior.

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Topics: Grid Tie Inverter, Digital Power Control, energy storage

A Second Generation Digital SCR Controller

Posted by Dave Zendzian on May 2, 2017 8:48:15 AM

The OZSCR2000 is our latest SCR Firing and Control board offering, built upon the successful OZSCR1000 digital control platform. This second generation controller uses a Texas Instruments Piccolo processor, and provides all the original digital control features, including:

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Topics: Digital Power Control, SCR Controller

What is Smart Grid Technology?

Posted by Dave Zendzian on Jul 26, 2011 2:09:00 PM

Demand for electricity is expected to continue growing at historical rates for the foreseeable future. While utility companies strive to meet that demand by financing and constructing new power-generating plants, fueled by coal, atomic energy, wind, sunlight, and water, they’re also scrambling to create a “smart grid.”

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Topics: Digital Power Control

Alternative Energy Distribution Methods

Posted by Dave Zendzian on Jul 12, 2011 11:11:00 AM

The term alternative energy generally describes renewable sources such as solar, wind, and hydroelectric power. Hydroelectric energy accounts for the majority of U.S. renewable energy, at 70 percent, though the use of solar, wind and other renewable energy is continuing to grow. Methods of alternative energy distribution vary, and here I’ll provide a brief description of the three most prevalent methods. It’s important to keep in mind that digitally controlled power systems will help prevent wasted energy, no matter which distribution system is used. 

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Topics: Wind, Digital Power Control