Method and device for preventing the disconnection of an electric power generating plant from the electrical grid
First Claim
1. Procedure to prevent the disconnection of a park of electric generators (12) from a network (14) in the event of a voltage sag including the steps of permanent monitoring of the network (14) voltage and, in the event of a voltage sag, regulating the voltage supplied to the network (14) in proportion to the magnitude of the sag, wherein said voltage regulation is carried out at a park level comprising steps of adjusting the voltage provided by the park (12) to the network (14), dissipating and/or storing the part of the active power generated by the whole park (12) which is not provided to the network (14), and maintaining the voltage in the park (12) at a nominal level.
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Accused Products
Abstract
Procedures to prevent the disconnection of a park of electricity generators from a network in the event of a voltage sag, through which, upon detection of the sag, the voltage travelling to the network is controlled in proportion to the magnitude of the sag; the active power produced by the park, rather than sent to the network, is thus diverted into to storage and/or energy dissipation equipment, keeping the park voltage at a nominal level.
The invention also includes a device for carrying out procedures integrating a bypass, transformer, static inverter, static converter, capacitance and dissipation resistance unit, voltage sag detection circuit and control circuit.
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Citations
7 Claims
- 1. Procedure to prevent the disconnection of a park of electric generators (12) from a network (14) in the event of a voltage sag including the steps of permanent monitoring of the network (14) voltage and, in the event of a voltage sag, regulating the voltage supplied to the network (14) in proportion to the magnitude of the sag, wherein said voltage regulation is carried out at a park level comprising steps of adjusting the voltage provided by the park (12) to the network (14), dissipating and/or storing the part of the active power generated by the whole park (12) which is not provided to the network (14), and maintaining the voltage in the park (12) at a nominal level.
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4. A device to prevent the disconnection of a park of electric generators from a MV (14) network in the event of a voltage sag, comprising:
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a) a MV, three-phase, static bypass (1) device and an automatic switch (2) and two isolators (3) corresponding thereto; b) a low voltage protection device; c) a LV/MV series transformer (4); d) a DC/AC static inverter (5); e) a DC/DC static converter (6); f) a capacitance (7) and dissipation resistance (8) unit; g) a MV network voltage sag detection circuit (10); h) a control circuit (20) connected to electronic controls (11, 15, 16) of components a) d), e) and to said detection circuit (10);
wherein said components are arranged so that in the event of a voltage sag in the MV (14) network detected by the detection circuit (10), the inverter (5) regulates the voltage sent to the MV network (14) by the transformer (4) in proportion to the magnitude of the voltage sag and the voltage sent to the MV internal network (12) for maintaining the park voltage at a nominal level, the active power generated by the park which is not directed to the MV network (14) is diverted to the capacitance (7) and resistance (8) unit, and the reactive power sent to the MV network (14) is controlled. - View Dependent Claims (5, 6, 7)
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Specification