Abstract:
PROBLEM TO BE SOLVED: To specify a method for estimating the state of a power electronic system. SOLUTION: The method for estimating the state of the power electronic system 1 is specified, and the system 1 has a converter circuit 4. In this method, the sum of a vector norm obtained by subtracting a first system model function f(x(k), u(k)) from a system state vector x(k+1) and another vector norm obtained by subtracting a second system model function g(x(k), u(k)) from an output variable vector y(k) becomes minimal over a sampling time of k=-N+1 to k=0. The system state vector x(k) and the system state vector x(k+1) for each sampling time of k=-N+1 to k=0 are varied, and then a system state vector x(k) at the sampling time of k=0 is selected. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a switchgear cell capable of switching five or more voltage levels by a simple method. SOLUTION: A first and a second branch circuit 1, 2 of the switchgear cell for switching n switching voltage levels, where n=5, 7, 9, ..., is specified, includes n-1 series-connected power semiconductor switches and p=n-2 power semiconductor switch junction points between the series-connected power semiconductor switches of each branch circuit 1, 2. A power semiconductor switch 9 of an intermediate circuit 5 connected to the junction points of the power semiconductor switches having a counting number x COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a switchgear cell which stores as little electrical energy as possible during its operation and can be designed in a space-saving manner. SOLUTION: A switchgear cell has a group 1 of connection, the group of connection having a first and a second controllable bidirectional power semiconductor switch 2, 3 and a capacitor 25. The group of connection can have a third, fourth, fifth, and sixth controllable bidirectional power semiconductor switch 4, 5, 6, 7 and the first controllable bidirectional power semiconductor switch 2 can be connected back-to-back in series with the second controllable bidirectional power semiconductor switch 3, the third controllable bidirectional power semiconductor switch 4 can be connected back-to-back in series with the fourth controllable bidirectional power semiconductor switch 5. The capacitor 25 can be connected to the connection point of the first controllable bidirectional power semiconductor switch 2 to the second controllable bidirectional power semiconductor switch 3. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method of diffusing a loss of heat from internal conductors, a high-voltage system, and a high-power circuit breaker. SOLUTION: The high-voltage system includes a supply line (40) and the high power circuit breaker (20), this supply line (40) is provided with the internal conductor (41) extended in a lengthwise direction and an external conductor (42) surrounding this internal conductor, the high power circuit breaker (20) is provided with an internal conductor (21), extending in the lengthwise direction and an external conductor (22) surrounding this internal conductor (21) by the type of housing. The internal conductors (21, 41) and the external conductors (22, 42) are connected, in a manner such as to make electrical conduction with each other. At least one heating pipe (1) is provided for the purpose of diffusing heat energy from the internal conductor (21). The heat pipe (1) interacts with a cooling gas flow (51). COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a film for a film capacitor or the other capacitive components. SOLUTION: When a capacitor is charged in operation, such a strong electric field that may cause an electrical breakdown can be generated at the end of a conductor 2. Basically, in this invention, an end region film layer is formed at the end of a conductive layer forming an electrode, and the film layer is partly charged during the time intervals determined by the change of an applied voltage, for example, in AC current intervals, the film layer has a feature that it is only partly charged. Therefore, the end region film layer must have a smaller surface conductivity than the surface conductivity of the conductive layer. That the end region film layer is only partly charged means that there is almost no discontinuity in voltage distribution, which enables to avoid a large uprise in field strength.
Abstract:
PROBLEM TO BE SOLVED: To furthermore improve quality and efficiency in a generated maintenance plan. SOLUTION: In this maintenance planning method and a system for a technical system, the technical system 10 is equipped with a plurality of substations 1, and each of them is equipped with plural device 2, 3, 4, 5, 6, and the method determines a maintenance schedule designated when each of the plurality of substations 1 and the devices 2, 3, 4, 5, 6 is included in a maintenance task, and the method (a) determines function dependency between the substations 1 and/or the devices 2, 3, 4, 5, 6, and (b) integrates the maintenance task by determining the maintenance schedule. Resultantly, a cost function having a cost as the substitute for at least one period during the period wherein at least a part of the technical system 10 can not be executed owing to a maintenance activity is minimized, and the cost has a step determined by the function dependency.