83results about How to "Eliminate detection blind spots" patented technology

The invention relates to a signal acquisition device of a correction controller, wherein the light emitted by a high-brightness LED (light-emitting diode) is directly focused to the detected object via a first convex lens; the reflected light on the detected object is rectilinearly propagated to a third convex lens via a second convex lens; the light of the third convex lens is focused to TCS230 colour sensors; the light signal received by the TCS230 colour sensors is conveyed to a single chip; the single chip processes and outputs data; two TCS230 colour sensors are used and placed on a PCB (printed circuit board) up and down; and the positions of the transversal parts of the two TCS230 colour sensors are superposed, and the transversal superposition distance must be less than the width of a reference guide wire. The detection blind zone of the correction controller is efficiently eliminated; and the control accuracy of the correction controller in either edge guiding mode or line detection mode can meet even exceed the present requirements of industrial field.

The invention discloses a grid-connected inverter island detection method based on wavelet transform and a neural network. The method is characterized in that the method comprises the following steps: firstly, gathering voltage values of a distributed grid-connected power generation system at a point of common coupling at island state and non-island state and the output current value of an inverter, then performing wavelet transform on the gathered voltage values and the output current value of the inverter and exacting high-frequency component wavelet coefficients to be processed, and finally taking processed signals as input signals of the neural network, and taking corresponding island state and non-island stage as output signals to train the neural network, so as to ensure that the system obtains recognition capability to the island state and the non-island state, and to adopt corresponding island protection measures when the distributed grid-connected power generation system is at the island state. The method can not only overcome the disadvantages of the existing passive island detection method that the detection blind area is large and the detection time is long, but also can solve the problem that the active island detection method affects the power supply quality of the distributed grid-connected power generation system, and rapidly accomplish island detection and island protection.