3 results about "Admittance" patented technology

A method, system, server architecture and/or tangible medium upgrade and award admittance of events to an event customer, preferably via a data communication network. The method includes, for example, receiving a communication from the event customer, the communication including a request to obtain admittance to at least one event, the communication also including an identifier associated with the event customer, admitting the event customer at the point of sale system after verification of the request, and updating a database indicating that the request was processed. The method also includes determining first predetermined criteria associated with the event indicative of at least one other event customer not attending the event, releasing an allocation associated with the at least one other event customer, and notifying at least another of the event customers to perform the upgrade and/or reallocation.

The invention discloses a harmonic power flow calculation method containing a VSC (Voltage Source Converter). Firstly, the fundamental wave power flow is calculated to obtain the fundamental wave voltage of each node, and the modulation ratio of the VSC is obtained; secondly, three pieces of input data, namely, the DC voltage, the modulation ratio and the carrier frequency are substituted into theharmonic model formula of the VSC to obtain the content of each harmonic in the AC side voltage of the VSC, and the VSC is regarded as a harmonic voltage source approximately; and thirdly, in order to realize an interface between a VSC harmonic voltage source model and the harmonic power flow, the VSC and the AC side transformer thereof are equivalent to a harmonic current source with internal impedance based on the Norton's equivalence theorem to form a harmonic admittance matrix, and the harmonic power flow is calculated by harmonic current injection.

The invention discloses a power grid circuit wide-area current protection method. The method includes the first step of synchronously measuring the voltage phasor and current phasor of each transformer substation of a power grid through an existing wide-area measuring system of the power grid so as to obtain power grid synchronous data; the second step of calculating an admittance variation matrix through a wide-area backup protection system when single-circuit trip of the power grid occurs, and further calculating a voltage variation matrix of each transformer substation and the current variation of each circuit after the single-circuit trip of the power grid occurs; the third step of establishing a current protection criterion according to the calculated circuit current variation and the circuit current variation measured through the existing wide-area measuring system. According to the power grid circuit wide-area current protection method, the function of protecting the power grid circuit wide-area current after the single-circuit trip occurs is achieved through the existing wide-area measuring system of the power grid; when the topological structure of the power grid changes after the single-circuit trip of the power grid occurs, the variation of current which flows through each circuit after the single-circuit trip of the power grid occurs can be directly calculated without modifying the power grid admittance matrix, and the whole calculation process can be completed within 200 microseconds.