275 results about "Pv power" patented technology

A method and apparatus is disclosed for monitoring the performance of a solar powered electrical supply where the supply comprises an array of photovoltaic cells that are mounted on a building. In one embodiment, the apparatus comprises: a device for producing a signal representative of solar irradiance; circuitry for computing a running performance signal by using at least the irradiance signal and a measure of the electrical power supplied to the load from the array; a radio for broadcasting the performance signal; and a portable unit for receiving the performance signal from the radio and for visually displaying the performance signal, power production, and electrical utility usage.

A system and method for selectively connecting photovoltaic (PV) arrays of a PV power system in series and parallel arrangements is disclosed. A DC-to-AC power inverter in the PV power system is electrically coupled to a plurality of PV arrays to receive a DC output therefrom and invert the DC output to an AC output, with the DC-to-AC power inverter including a DC link that receives the DC output from the plurality of PV arrays. A contactor arrangement is positioned between the plurality of PV arrays and the DC-to-AC power inverter, with the contactor arrangement including a plurality of contactors that are switchable between an on state and an off state to selectively connect the plurality of PV arrays to the DC-to-AC power inverter in a specified arrangement, so as to control a level of DC voltage received by the DC-to-AC power inverter from the plurality of PV arrays.

The embodiment of the invention discloses a short-circuit current calculation method and system, and the method comprises the following steps: S01, forming a basic database according to an actual power grid, and building a model of a set power grid operation mode; s02, scanning the short-circuit current level of the whole network; s03, solving each sequence impedance reduced to the short-circuit point by using a Newton method in combination with an iterative method, and solving the total current of the short-circuit point; s04, superposing the positive sequence component, the negative sequencecomponent and the zero sequence component of the total current of the short-circuit point to obtain a final short-circuit current; an inverter circuit, a control system and a boosting transformer control circuit are utilized. The positive sequence component, the negative sequence component and the zero sequence component can be superposed to obtain voltage and current of each phase; a set value of the internal potential of the inverter type photovoltaic power supply is generated through the step-up transformer control circuit recursive function, an overall mathematical model of a line power grid is established, the calculation amount is reduced, the calculation speed is increased, the calculation time is shortened, the operation efficiency is improved, the power supply safety can be improved, and the power grid can flexibly operate.

The invention relates to a photovoltaic power generation and urban power grid parallel power supply switching device which solves the problems of the existing device that the existing device is complex in structure, high in cost and poor in backflow-prevention performance during parallel power supply and a photovoltaic power supply cannot output the maximum power constantly. The photovoltaic power generation and urban power grid parallel power supply switching device comprises an alternating-current switching unit, a power supply unit, a control unit, a driving circuit, a sampling regulation unit and the like. The alternating-current switching unit is subjected to logic switching control by aid of the pulse width modulation strategy and the digital signal processor (DSP) software phase lock technology. The photovoltaic power generation and urban power grid parallel power supply switching device provides good guarantee for achievement of backflow-free photovoltaic power generation and urban power grid parallel power supply.

The invention relates to a solar chimney power generation system combining the photovoltaic technology, comprising a solar chimney and a solar thermal collector, wherein, the ceiling of the solar thermal collector is stuck with a thin film solar PV panel; or the bottom surface of the solar thermal collector is paved with the solar panel. The thin film solar PV panel stuck on the ceiling of the solar thermal collector is non-light tight. The solar panel paved on the bottom surface of the solar thermal collector is an ordinary monocrystalline silicon solar PV panel. The system can take full advantage of the light energy and the heat energy of the solar energy, after the solar panel converts the light energy of the solar energy into the electrical energy, the remaining solar energy is used for heating the air entering the solar thermal collector in the form of heat energy; the PV panel can be cooled perfectly to guarantee the efficiency and the generated output of the PV power generation system; the system raises the rate of utilization of the solar chimney power generation system on the solar energy and raises the generating efficiency of the solar chimney power generation system by about 30 percents.

The invention discloses a reactive power control method for a low-voltage power distribution transformer district with distributed photovoltaics. A distributed photovoltaic power supply, a photovoltaic inverter and a capacitor are arranged in the low-voltage power distribution transformer district. The reactive power control method comprises the following process of (S1) dividing a reactive powercontrol interval according to the voltage and power factor range of the transformer district, (S2) collecting low-voltage side voltage and power factors in the low-voltage power distribution transformer district, determining the reactive power control interval of a current transformer district according to the range of the voltage and the power factors and adjusting the reactive output of the photovoltaic inverter and the capacitor according to a control strategy corresponding to the reactive power control interval to achieve the reactive power adjustment of the low-voltage power distributiontransformer district. The operation interval of the transformer district is divided according to the voltage and power factors of the transformer district, the equipment such as a capacitor, an SVG and a photovoltaic inverter in the transformer district is controlled in real time according to a control strategy, and the reasonable scheduling of the transformer district voltage and power factors isensured.

The embodiment of the invention discloses a distribution network collaborative optimization scheduling method considering distributed photovoltaic and electric vehicles. The method comprises the stepsof obtaining photovoltaic and vehicle data of a distribution network; making load flow calculation on a power distribution network, and determining the optimal load flow of the power distribution network and the load of each node when V2G is included; establishing a probability output model of the distributed photovoltaic power supply, and analyzing distributed photovoltaic expected output in different time periods; establishing a power generation side scheduling model taking the minimum power generation cost as a target function, and performing power supply joint optimization; establishing aload side optimal scheduling model integrating the peak-valley difference and the network loss, and solving the load side optimal scheduling model by adopting an improved particle swarm algorithm; and updating the load parameters in real time by adopting a load side optimal scheduling model integrating the peak-valley difference and the network loss and taking the minimum peak-valley difference and the minimum network loss as an optimization target. The technical problems that disordered electric vehicle charging and discharging enable the load peak-valley difference of the power distributionnetwork to be increased, the network loss of the power distribution network is increased, and the economy is reduced are solved.

The invention discloses a photovoltaic power structure and a maximum power tracking control method. The photovoltaic power structure comprises a photovoltaic assembly, BOOST circuits and a maximum power tracking control unit. An A output terminal and a B output terminal of the photovoltaic assembly are connected with the BOOST circuits respectively. Output terminals of the two BOOST circuits are connected in series and then are connected in parallel with a capacitor. A backward stage of the capacitor is grid-connected through a grid-connected system. The maximum power control unit compares output voltages of the two BOOST circuits. A difference value is converted into a corresponding duty ratio through a PI regulator. Then the duty ratio is converted into a corresponding PWM wave so that output power of the photovoltaic assembly is dynamically adjusted. And finally the photovoltaic assembly works stably at a maximum power point. By using the method, control is simple; a current sensor, memory and a microprocessor are not needed; only a simple circuit is needed so that maximum power tracking can be realized; cost can be greatly reduced.

The present disclosure relates to a charge power control apparatus, a charge power control method, a program, and a solar power generation system, for improving charge efficiency. A solar power generation system includes a solar panel that receives sunlight to generate power, a PV power conditioner that performs DC / AC conversion of the power generated by the solar panel, and a charging AC / DC converter that performs AC / DC conversion of power output from the PV power conditioner and charges a storage battery. Voltage of the power supplied to the PV power conditioner from the solar panel is acquired while the power supplied from a power system is stopped, and a change in power supplied to the PV power conditioner from the solar panel is obtained according to the voltage. Charge power that is output from the charging AC / DC converter to charge the storage battery is adjusted based on the change in voltage.

The present invention provides a photovoltaic power station remote monitoring system, comprising a monitoring center system and at least one monitoring terminal system; each monitoring terminal system is used for collecting operating parameters of a photovoltaic power station to which it belongs, and sending the operating parameters to the monitoring center system via a telecommunication network; the monitoring center system is used for receiving and displaying the operating parameters sent from respective monitoring terminal systems. For the monitoring personnel, a remote monitoring of respective PV power stations may be achieved only at the monitoring center system, which facilitates the monitoring.

The invention is an apparatus for and method of configuring a solar PV system where the output power of the system is stabilized under dynamic cloud cover conditions. The invention comprises a typical grid-tied solar photovoltaic power system which includes solar modules and a typical grid-tied DC to AC power converter and a second, semi-autonomous, bidirectional power converter coupled between the same electrical grid and storage batteries. The system also includes sensors and / or a communication link between the two power converters. The composite system acts to stabilize the amount of power into the grid by monitoring dynamic power reductions in PV power production and by supplying power from the storage batteries to the grid during a PV power dropout event, for a net smoothing of the amount of power injected into the grid over a wide range of dropout event durations.