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Diesel / Battery Control Options

Diesel / Battery Control Options. 8/24/2010. Load Following vs. Cycle Charging. Under a ‘load following’ control strategy, whenever the diesel generator is needed, it produces only enough power to meet the current electricity demand.

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Diesel / Battery Control Options

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  1. Diesel / Battery Control Options 8/24/2010

  2. Load Following vs. Cycle Charging • Under a ‘load following’ control strategy, whenever the diesel generator is needed, it produces only enough power to meet the current electricity demand. • Under this scenario, none of the electricity produced by the diesel generators is stored by the battery (thus, there is no wasted fuel due to battery inefficiency) • Under a ‘cycle charging’ control strategy, whenever the diesel generator is needed, it operates at full capacity. Surplus power (generated in excess of the current electricity demand) goes to charge the battery bank. • A setpoint can be specified in the battery controller such that the generator(s) will not stop charging the battery bank until it reaches the specified state of charge. • Under this scenario, the diesel generators can be turned off at night and mid-day

  3. Control Strategy 1:Load Following • Battery size = 1000kWh (two ZESS 500) • Model Results: • The diesel generator runs all night at relatively low load. It can be switched off on some days during peak sun, but not predictably. • Model results (summary): • Fuel use: 356,000 L/yr • CO2e Emissions: 2,650 tonnes/yr • Estimated gen set starts per year: 596 • Estimated Diesel gen set life: 4.4 yr Modeled 455kW gen set output power

  4. Control Strategy 2:Cycle Charging, Charge Setpoint = 100% • Battery size = 1000kWh (two ZESS 500) • Model Results: • The diesel generator is not needed between 11pm and 5am. On average, it does not run during peak-sun (9am – 4pm) • Model results (summary): • Fuel use: 408,000 L/yr • CO2e Emissions: 3,040 tonnes/yr • Estimated gen set starts per year: 740 • Estimated Diesel gen set life: 6.7 yr Modeled 455kW gen set output power

  5. Control Strategy 3:Cycle Charging, Charge Setpoint = 90% • Battery size = 1000kWh (two ZESS 500) • Model Results: • The diesel generator is not needed between 11pm and 5am. On average, it does not run during peak-sun (9am – 4pm) • Model results (summary): • Fuel use: 405,000 L/yr • CO2e Emissions: 3,020 tonnes/yr • Estimated gen set starts per year: 750 • Estimated Diesel gen set life: 6.9 yr Modeled 455kW gen set output power

  6. Control Strategy 4:Cycle Charging, Charge Setpoint = 80% • Battery size = 1000kWh (two ZESS 500) • Model Results: • The diesel generator is not needed between 11pm and 5am. On average, it does not run during peak-sun (9am – 4pm) • Model results (summary): • Fuel use: 403,000 L/yr • CO2e Emissions: 3,000 tonnes/yr • Estimated gen set starts per year: 750 • Estimated Diesel gen set life: 7.2 yr Modeled 455kW gen set output power

  7. Control Strategy 5:Cycle Charging, Charge Setpoint = 60% • Battery size = 1000kWh (two ZESS 500) • Model Results: • The diesel generator is not needed between 11pm and 5am. On average, it does not run during peak-sun (9am – 4pm) • Model results (summary): • Fuel use: 401,000 L/yr • CO2e Emissions: 2,980 tonnes/yr • Estimated gen set starts per year: 760 • Estimated Diesel gen set life: 7.7 yr Modeled 455kW gen set output power

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