40 results about "Reference tracking" patented technology

An exemplary electrical converter includes a plurality of semiconductor switches. The electrical converter is configured for generating a two-level or multi-level output voltage from an input voltage by switching the plurality of semiconductor switches. A method for controlling the electrical converter includes receiving a reference electrical quantity (iS*) and an actual electrical quantity (iS), determining a sequence of future electrical quantities of the electrical converter from the actual electrical quantity, determining a maximal cost value based on the sequence of future electrical quantities, and iteratively determining an optimal switching sequence for the electrical converter. A switching sequence includes a sequence of future switching states for the semiconductor switches of the electrical converter. The method also includes selecting the first switching state of the optimal switching sequence as the next switching state (u) to be applied to the semiconductor switches of the electrical converter.

The system described herein may track references to a shared object by concurrently executing threads using a reference tracking data structure that includes an owner field and an array of byte-addressable per-thread entries, each including a per-thread reference counter and a per-thread counter lock. Slotted threads assigned to a given array entry may increment or decrement the per-thread reference counter in that entry in response to referencing or dereferencing the shared object. Unslotted threads may increment or decrement a shared unslotted reference counter. A thread may update the data structure and / or examine it to determine whether the number of references to the shared object is zero or non-zero using a blocking-optimistic or a non-blocking mechanism. A checking thread may acquire ownership of the data structure, obtain an instantaneous snapshot of all counters, and return a value indicating whether the number of references to the shared object is zero or non-zero.

A method, computer program product, and computer system for determining, by a computing device, that an object of a plurality of objects is an orphan. It may be determined that the object is older than a threshold age. A capacity occupied by the object may be reclaimed based upon, at least in part, determining that the object is an orphan and determining that the object is older than the threshold age.

A winding synchronous machine having a moving object including an inverter circuit comprises: a moving-object inverter circuit connected to the moving object of the winding synchronous machine; and a moving-object circuit control device connected to the moving-object inverter circuit so as to control the moving-object inverter circuit. The moving-object circuit control device may comprise: a stator inverter voltage estimator estimating a high-frequency voltage of a stator inverter circuit; a field current reference generator generating a field current reference of the moving object; and an energy storage device voltage controller generating a current reference tracking a DC-link energy storage device voltage of the moving object. Problems associated with using a rare-earth permanent magnet can be thereby overcome, and a winding synchronous machine including an excitation circuit in which ripples almost never occur can be implemented without using an extra power source.

An object specifying device mounted in a controlled vehicle has a unit for tracking objects, existing in a monitoring area set along a running direction of the controlled vehicle, to detect the objects as forward objects, a unit for specifying one forward object running in the area as a forward vehicle, a unit for specifying each of other forward objects as a candidate for a control-based object when the forward object is placed in an inter-vehicle area between the controlled and forward vehicles, and a unit for specifying each candidate, tracked for a tracking period equal to or longer than a reference tracking period, as a control-based object and specifies each candidate, tracked for a tracking period shorter than the reference tracking period, as a non-control-based object. The controlled vehicle is controlled according to a movement of the control-based objects, regardless of a movement of the non-control-based objects.

A sub-pixel-level target tracking method based on feature matching, including: selecting the tracking point of the first frame image as a reference tracking point in the continuously transmitted images; respectively processing the first frame image and the Nth frame image to obtain the first frame image The feature vector of a frame image and the feature vector of the Nth frame image, N is a natural number greater than 1; the first frame image is matched with the feature vector of the Nth frame image to obtain a pair of feature points; the pair of feature points is estimated to obtain Transformation matrix, perform dot multiplication between the transformation matrix and the reference tracking point to obtain a new tracking point, and complete the update of the tracking point. The sub-pixel-level target tracking method based on feature matching proposed by the present invention can track a point in the target with high precision, and is robust when there are obvious changes in the image tracking point area; at the same time, the method is simple to calculate and can be parallelized High precision is beneficial for accelerated calculations, and can be widely used in high-speed and high-precision real-time tracking photoelectric countermeasure systems.

The invention discloses a single-phase self-excitation wind power generation system. A single-phase self-excitation generator with adjustable excitation consists of a three-phase squirrel-cage motor, a capacitor with fixed excitation and a capacitor with adjustable excitation; the capacitor with adjustable excitation comprises a fixed capacitive value and an adjustable capacitive value, and the capacitive value adjustment is realized by IGBT duty ratio regulation and control; an alternating current load is connected with a bidirectional PWM converter in parallel, and coupled with an electric generator stator winding; an adjusting mechanism for adjusting voltage frequency of the electric generator is formed by a bidirectional converter and a storage battery; when the voltage control saturation of the capacitor with adjustable excitation is limited, the adjusting mechanism cooperatively controls the port voltage of the electric generator, and an active and reactive current reference tracking control policy is completed by adopting a 90-degree phase shift based single-phase voltage and current decoupling policy; and the active current reference is implemented by a frequency setting PI tracking controller, while the reactive current reference is implemented by a voltage amplitude PI tracking controller, and the reactive current reference value is the value, exceeding the saturation limited part, of the PI control output.