Revision as of 15:52, 27 May 2010 by
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Overview:
Function:
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Load- or Flow- controller
ensure that the power output does not exceed the power demand (e.g. 230V, 50
Hz).
If flow of water in a MHP-station is constant
the energy output of a turbine/generator is constant as well. Power
demand is
usually fluctuating over the time (e.g. day/night). If supply is higher than demand, excess energy must be diverted, dumped. altrenatively the
water flow can be reduced which results in less power output.
In case of more power demand than supply the controler cuts of
the of demand line.
Load controller are placed
between generator output and the consumer line.
Control Elements
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Electronic circuit, which keeps output power constant in Frequency- and
Voltage- parameters.
Fluctuating
energy demand requires a mechanism which either regulates the water input into
the turbine (=> flow control) or by diverting excess energy from the consumer connection (=>ballast load).
Ballast load
usually electrical heaters in water or air. If energy
demand is temporarily low the excess energy is converted into heat.
Flow control
regulates the
amount of water into the turbine in order to match power output and power
demand
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