5 results about "Source transformation" patented technology

Modifications to existing computer hardware, compiler changes or source-to-source transforms performed during the software build process, and a collection of libraries and modifications to existing standard system software and libraries. The invention allows a program author to enforce various kinds of locality of causality in software to provide enforcement of boundaries for the following aspects of a computer program: control, space, time, modularity, reference, initialization, and mutability. Where these properties do not suffice to guarantee a property at static time, dynamic checks may be added and the constraints on control flow prevent such dynamic checks from being avoided by the program.

The invention belongs to the technical field of new energy grid-connected / off-grid control and micro-grid power supply conversion, and discloses a self-phase-locking grid-building type inverter control method. According to the method, a frequency-phase droop phase-locking mode is introduced on the basis of a network-forming inverter, so that an external positive feedback channel generated by power grid impedance and PLL coupling is effectively weakened, and the inverter still keeps stable operation under the condition of a weak power grid; meanwhile, through a self-phase-locking mechanism, the inverter can autonomously establish and maintain the characteristics of a voltage source without depending on an external power grid, and stable voltage building and self-synchronization operation under the off-grid condition are achieved. Furthermore, a virtual resistor is introduced on a dq axis, so that an inverter port is represented as a non-ideal voltage source, and formation of a unified modeling framework and a grid-connected analysis basis is facilitated. On the whole, the stability and robustness of the inverter under the weak network and island working conditions are remarkably improved through the self-phase-locking strategy of the network construction type inverter provided by the invention, and seamless switching of the grid-connected / off-grid operation mode is realized.

The invention discloses a three-phase current source inverter fault diagnosis and positioning method based on phase angle signal characteristics, and belongs to the technical field of new energy converter fault diagnosis and positioning. Firstly, a three-phase load current signal of a system is measured, and a three-phase current fitting degree is calculated according to the three-phase load current signal for fault judgment; secondly, converting three-phase load current in an abc coordinate system into an alpha-beta coordinate system according to Clark coordinate conversion, dynamically calculating a module value of a space current vector in real time, performing normalization processing on current signals in a two-phase static coordinate system, and calculating the processed signals through a frequency doubling phase angle feature classification method; next, a fault phase angle is judged through a three-phase current fitting degree and frequency doubling phase angle feature classification method, sampling is carried out, and coding is carried out according to a sampling result to carry out fault positioning. A real-time processing and judging process is adopted in the fault judging and positioning process, and the dynamic performance and the anti-jamming capability of the system are improved.

This invention discloses a source-well mode implementation and circuit switching method in a digital source meter. First, the AC power supply is converted to DC power greater than 250V by a PFC (Power Factor Correction) circuit. Then, it is output through a two-stage composite voltage regulator circuit: the first stage is a programmable composite method of switching regulation and linear regulation, and the second stage is a source / well circuit. A comparator compares the output with a preset threshold, and the logic control circuit generates a drive signal accordingly to control the on / off state of the corresponding power MOSFET combination, thereby achieving the switching between source and well modes. This allows for precise output of (source mode) voltage or current, simultaneous measurement of (well mode) current or voltage, and fast, smooth, and overshoot-free automatic or programmable switching between source and well modes.

The application discloses a power input identification method, a power input identification circuit and an electronic device, which are applied to input identification of a power conversion circuit. The power input identification method comprises the following steps: acquiring an input voltage of the power conversion circuit; obtaining a primary voltage outer loop output value by using a difference between the input voltage and a given value of a perturbation input voltage; detecting whether the primary voltage outer loop output value is smaller than a maximum limiting value; if the primary voltage outer loop output value is smaller than the maximum limiting value, determining that the power conversion circuit is a photovoltaic power input; and if the primary voltage outer loop output value is not smaller than the maximum limiting value, determining that the power conversion circuit is a direct-current voltage source input. Through the above method, the power input identification method of the application intelligently identifies the input type of the power conversion circuit by using whether the primary voltage outer loop output value is smaller than the maximum limiting value, i.e. whether the perturbation voltage outer loop output is saturated, so that the control logic is simpler, the operation complexity of a user is reduced, and the reliability of the system is improved.