Connecting existing or new Gensets with superimposed PV-DIESEL CONTROLLER via Woodward’s easYgen3000XT and/or Woodward’s MFR 300

Introduction

Conventional Power Generation in rural regions with weak grids or on islands is often based on Power Stations (reciprocating engines) fired by fossil fuels. Beside the required maintenance for these types of Gensets, the dominating cost factor is the fuel itself. The logistics in rural regions/islands also increase the local fuel price. Independent Power Producer aim to get rid of this continuously increasing cost factor and are therefore highly interested in any kind of reduction potential.

As before described applications can often be found in the Sunbelt region, PV power is considered as an appropriate source to offer grid support for lowest cost. But in order to grant stable grid conditions, island grids require some additional considerations as:

• Providing sufficient spinning reserve for load jumps

• Providing sufficient over-current capacity to trigger fuses and secure installation in the event of short circuits

• Operating Genset at its optimal operating point and avoid increasing wear due under-load

• Providing common control functions for more than single Genset as

  • Load dependent Start/Stop

  • Automatic synchronizing to bus-bar

  • Predictive maintenance of Genset

  • Managing automatic load share of Gensets

  • Leveling utilization of Gensets (operating hours)

Woodward with its partners in conventional Power Generation and in systems and solutions in Photovoltaic have developed a System to extend Genset installations with PV-Power in order to reduce fuel consumption and according OPEX-cost. By using PV as “negative load”, amortization times for the required PV-Plant extension of 3-4 years are achievable. Given that PV plants are designed for a lifetime of at least 20 years, investors can run such Hybrid systems with highest profitability. The trend of dropping PV-cost and increasing fuel cost is an additional factor and reduces risk for operators and investors.

easYgen3000XT

(software version 2.15 and higher)

The ‘easYgen’ is a Genset Controller which manages the control of the single Genset as well as the control of up to 32 Gensets working on the same bus bar. Thus it accommodates common control functions as 

o    Load dependent Start/Stop

o    Automatic synchronizing to bus-bar

o    Predictive maintenance of Genset

o    Managing automatic load share of Gensets

o    Leveling utilization of Gensets (operating hours)

The Gensets are linked via the CAN bus line and operate in a multi master mode. The data on this CAN bus are arranged as below.

MULTI FUNCTION RELAY MFR 300

Alternative to the MFR300, could an Modbus protocol provide these measurements.

The ‘MFR 300’ can be integrated in the system to measure Voltage/Frequency in order to sense the load flow in a meshed grid with its characteristic values for active/reactive power and according power factor for each phase. The ‘MFR 300’ is used in the PV-Diesel application to either measure the values for PV power generation or to detect values for the load. The ‘MFR 300’ is connected to the superimposed ‘DER PV-DIESEL CONTROLLER’ via the CAN bus line according to description below.

Explanation: x= 1…32