DSLC II/MSLC II

DSLC-2

Woodward’s Digital Synchronizer and Load Control

The Woodward DSLC-2™ (Digital Synchronizer and Load Control) is a microprocessor-based synchronizer and load control designed for use on three-phase AC generators. The DSLC-2 combines synchronizer, load sensor, load control, dead bus closing system, VAR, power factor and process control, all in one powerful package.

Applications allow up to 32 generators to be precisely paralleled and controlled. A dedicated Ethernet system provides seamless communications between DSLC-2 and MSLC-2 units. A second Ethernet port is provided for customer remote control and monitoring capability using Modbus TCP allowing easy DCS and PLC interfacing. Modbus RTU is available through a separate RS-485 port.

A redundant Ethernet network is possible with the two Ethernet ports.

Woodward used the original solid DSLC combined with an additional decade of application experience, to develop the new DSLC-2. The DSLC-2 excels in either simple generator or complex generator system applications. The DSLC-2/MSLC-2 combination provides multiple unit, segment, utility, and intertie breaker control for complex power systems.

Features include:

• Dedicated Ethernet network for precise system communications between all DSLC-2’s and MSLC-2’s reduces system wiring.
• Ethernet Modbus TCP, and Modbus RTU, for remote control and monitoring.
• Redundant Ethernet communication for enhanced reliability.
• The “system update” feature allows for removing or adding generator sets.
• The new DSLC-2 can be configured for multiple applications.
• Integrated DSLC-2 and MSLC-2 system functionality eliminates the need for redundant sensors (like PTs, CTs, and MOPs) that connect to individual modules such as the load sensors and synchronizers.
• Back panel mounting and a reduced size frees up door space and provides easy wiring.
• Eliminates the need for additional relay logic to control dead bus closing.
• Slip frequency paralleling, voltage matching, and speed bias transfer between the synchronizer and load control result in smooth paralleling without the risk of reverse power trips.
• Three-phase true RMS power sensing makes the DSLC-2 control accurate even with unbalanced phase loading and voltage fluctuations.
• Phase angle correction for GCB when a transformer is included in the system.
• The Woodward ToolKit™ software allows flexible setup using the same basic menu tree as the original DSLC plus an overview screen. Graphical overview of generator and bus bar parameters with trending makes the DSLC-2 commissioning friendly. All the Woodward devices can be programmed from a single connection to the network.
• The ToolKit can be accessed either via one of the Ethernet ports or via RS-232 port.

MSLC-2

Woodward’s Master Synchronizer and Load Control

Woodward’s MSLC-2™ functions with the DSLC-2™ control to provide synchronization and load control across Utility and Intertie breakers. The MSLC-2/DSLC-2 combination operates over an Ethernet communication network to control simple or complex generator system applications. This combination, 32 DSLC-2’s and 16 MSLC-2’s, provide multiple unit, multiple segment, utility and intertie power management for complex power systems. Controls plant wide import/export levels while always providing bump-less load transfers with utility.

The MSLC-2 control combines synchronization, dead bus closing, utility/intertie load sensor, baseload control, import/export control, VAR, power factor, and a master process control in one powerful package.

The MSLC-2’s load sensor and load control sense true RMS power and provide a bump-less loading and unloading against a utility grid. Baseload, import/export, process, and utility unload modes control the KW power between different power sources at the same time controlling the reactive power, VAR and power factor. Reactive power is also ramped on and off for the smoothest load transactions between power grids.

The MSLC-2 communicates via Ethernet, with redundant Ethernet now available, to control real and reactive loading against the utility by DSLC-2 equipped generators.

The tie breaker mode allows synchronization between multiple generator systems. Segments are connected and power can be measured across an intertie, but no load control is functional when in Tie breaker operation.

Features include:

• One MSLC-2 can provide master control for up to 32 DSLC and an additional 15 MSLC-2 in a system.
• Two dedicated Ethernet lines for precise system communications between all DSLC-2’s and MSLC-2’s on the system.
• Ethernet Modbus TCP for remote control and monitoring by PLC or DCS system.
• Redundant Ethernet communications for enhanced reliability.
• Master MSLC-2 redundancy, loss of communications with the designated MSLC-2 master initiates control hand off to the next designated MSLC-2 master.
• The MSLC-2 hardware is adjustable for multiple applications.
• Slip frequency or voltage phase matching synchronizing fully selectable with dead bus option in both directions provide full flexibility for intertie and main-tie-main applications.
• Having functions integrated into one box eliminates the need for redundant sensors (like PTs, CTs, and MOPs) that connect to individual modules such as the load sensor and synchronizer.
• Digital signal processing makes the MSLC-2 resistant to power line distortions and harmonics.
• Three-phase true RMS power sensing provides accurate readings even with unbalanced phase loading and voltage fluctuations.
• Export/import control over multiple utility MSLC-2’s in same segment.
• The Woodward ToolKit™ software allows flexible setup using the same basic menu tree as the original MSLC plus an overview screen. No hand held programmer is required. Graphical overview of generators and bus bar parameters with trending makes the MSLC-2 commissioning friendly.
• The Toolkit can be accessed either via one of the Ethernet ports or via RS-232 port.
• Phase angle compensation provides adjustment for additional deviation correction across a transformer.
• The system update feature allows for system reconfiguration.