Apparatus and method for dynamic voltage restoration of utility distribution networks
First Claim
1. A system for compensating for disturbances in a power distribution lien by inserting a signal carrying real power into said lien when a disturbance occurs, said line receiving utility power at a source voltage from a source end and delivering power at a load voltage to one or more loads at a load end, said system comprising:
- an energy storage element for storing energy;
a voltage generator operatively connected to said storage element, for dynamically generating a signal for injection into said line so as to correct for disturbances to the voltage signal from said source end;
an injection circuit for injecting said dynamic injection signal into said line between said source end and said load end; and
a controller for controlling said voltage generator as a function of real power delivered to said line by said injection circuit, whereby said injected signal is controlled to dynamically correct the voltage signal delivered at the load end and deliver real power to said line, so as to reduce the effect of disturbances on the line.
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Accused Products
Abstract
A system and method is provided compensating utility distribution line transients such as voltage sags in a dynamic manner, by inserting a voltage signal in series with the distribution signal having a magnitude and phase to effectively cancel out the voltage deviation caused by a network disturbance. An energy storage device such as a storage capacitor is used to provide energy to an inverter circuit which is controlled to generate the series-inserted signal. Preferably a converter such as a chopper is utilized between the storage element and the inverter, to provide a constant dc input to the inverter. A controller generates a corrective error signal based upon the deviation between the utility supply voltage as affected by the disturbance, and the nominal ideal voltage signal, and adjusts the insertion voltage so as to optimize real power delivery to the utility distribution line.
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Citations
18 Claims
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1. A system for compensating for disturbances in a power distribution lien by inserting a signal carrying real power into said lien when a disturbance occurs, said line receiving utility power at a source voltage from a source end and delivering power at a load voltage to one or more loads at a load end, said system comprising:
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an energy storage element for storing energy; a voltage generator operatively connected to said storage element, for dynamically generating a signal for injection into said line so as to correct for disturbances to the voltage signal from said source end; an injection circuit for injecting said dynamic injection signal into said line between said source end and said load end; and a controller for controlling said voltage generator as a function of real power delivered to said line by said injection circuit, whereby said injected signal is controlled to dynamically correct the voltage signal delivered at the load end and deliver real power to said line, so as to reduce the effect of disturbances on the line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of compensating for changes in the voltage delivered to a distribution line, said changes being introduced by disturbances in a utility network to which said line is connected, said line having a source end connected to receive a source voltage signal from said utility network and a load end connected to an electric load, comprising:
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dynamically injecting a voltage signal into said line in series with said source voltage so as to compensate for any voltage variation due to a disturbance; developing a signal representative of real power delivered to said line by said injected signal; and adjusting said injected signal as a function of the real power delivered by said injected signal to said line. - View Dependent Claims (13, 14)
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15. A system for compensating for disturbances in a power distribution line, said lien receiving a source voltage signal from a utility source at a source end and delivering an end voltage signal at a load end of said line, said system comprising:
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a source of energy for delivering power during line disturbances; voltage generator means operatively connected to said energy source and controllable for dynamically generating a signal for injection into said line so as to deliver power to said line and correct for disturbances to said source voltage signal; an injection circuit for injecting said dynamically generated signal into said line between said source end and said load end; and controller means for controlling said voltage generator means, said controller means having control signal means for generating control signals as a function of the voltage signal delivered by the line to said load end and of the real power delivered by said injection circuit into said line. - View Dependent Claims (16, 17, 18)
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Specification