38results about How to "Improve on-grid performance" patented technology

Disclosed is a wind power plant power controller. The power controller comprises a central processing unit, a power supply module, a power grid detection module, a communication module, an abnormality processing module, an active frequency control module and a reactive voltage control module, wherein the central processing unit is connected with the power supply module, the power grid detection module, the communication module, the abnormality processing module, the active frequency control module and the reactive voltage control module separately; the wind power plant power controller is mounted in a booster station, and the power controller, a wind turbine, a reactive compensation apparatus, a booster station monitoring system, a wind power plant monitoring (SCADA) system and a dispatching center main station form a wind power plant power control system network; and the wind power plant power controller receives active and voltage instructions from the dispatching center main station or underground in a communication way, performs unified cooperative control on the wind turbine, the reactive compensation apparatus, and a transformer gap gear, performs active power and reactive power regulation, and realizes stable control on frequencies and voltages.

The invention discloses a wind turbine generator set reactive power control method with a force excitation effect, and aims to control a wind turbine generator set which adopts a converter with a force excitation function. The method comprises the following steps: (1) enabling the force excitation function for a main control system of the wind turbine generator set; (2) judging the actual voltage value U of the wind turbine generator set, enabling the force excitation function for the wind turbine generator set, that is, enabling the wind turbine generator set to enter a force excitation mode when U is lower than a low-voltage force excitation operation threshold Ulow or higher than a high-voltage force excitation operation threshold Uhigh, performing lead compensation for force excitation if U is lower than Ulow, performing lag compensation for force excitation if U is higher than Uhigh, and performing compensation according to normal reactive power support when U is between Ulow and a 90% rated voltage of a wind turbine generator set system or between Uhigh and a 110% rated voltage of a wind turbine generator set system. Through adoption of the method, the voltage adaptability of the wind turbine generator set can be enhanced, so that the wind turbine generator set can operate within a wider voltage range, and a stronger support effect on a power grid can be achieved when a system voltage fault occurs; therefore, the method is particularly applicable to a double-fed wind turbine generator set.

The invention relates to a wind collecting vertical type wind power generating system which comprises a wind power system, a vertical type speed increaser, a vertical type generator and an excitation grid-connected control system, wherein the wind power system is connected with the speed increaser and the generator by a chain coupling; the generator is controlled by the excitation grid-connected control system; the wind power system is in a box frame structure and comprises a fan blade system and a wind collecting and protecting system; the upper end and the lower end of a box frame are respectively provided with an upper shed top and a lower shed plate; the wind collecting and protecting system comprises a plurality of wind collecting plates which are distributed at four sides of the boxframe and hydraulic drive equipment; the upper shed top, the lower shed plate and the wind collecting plates are connected to form a wind tunnel box type wind collecting body; the generator works in a multi-winding pole-changing control way; and the generator and the speed increaser are installed on the ground. The invention has the advantages of small size, low installation, maintenance and transportation cost, high wind power utilization ratio and wind field land utilization ratio, stable performance, high storm wind resistance and favorable power generating quality and grid-connected performance, can form a high-power wind power generator unit system and is suitable for various weather and geographic environments.

The invention provides a software and hardware integrated new energy power generation automatic grid-connected switch control system and method, and belongs to the technical field of grid-connected switch control. The software and hardware integrated new energy power generation automatic grid-connected switch control system comprise a hardware grid-connected control part and a software grid-connected control part. The software and hardware integrated new energy power generation automatic grid-connected switch control system has the beneficial effects that grid-connected control of a new energypower generation system is effectively achieved under the condition of three-phase unbalance and harmonic of a three-phase power grid voltage.

A wind farm automatic dynamic voltage control (AVC) system comprises: a AVC controller, multiple wind turbine control systems arranged on multiple wind turbines of the wind farm, a static reactive power compensation device (SVC), and multiple voltage transformers and current transformers arranged on wind power transmission lines, wind power assemble lines, SVC lines, high voltage buses and low voltage buses. Each wind power assemble line connects to the multiple wind turbines so as to receive the power output of the multiple wind turbines, and also connects to the low voltage buses. The AVC controller communicates with each wind turbine control system through an optical fiber network and electrically connects to the multiple voltage transformers and current transformers. The AVC controller determines the total reactive power that needs to be generated or absorbed by the wind farm, the total reactive power that can be generated or absorbed by each wind power assemble line and the total reactive power that can be generated or absorbed by each wind turbine, and sends the control signal corresponding to the reactive power that can be generated or absorbed by each wind turbine to the corresponding wind turbine control system.

A multi-winding variable-pole variable-speed vane-type vertical wind power generating system relates to a vertical wind power generating system. In order to solve the problems that the conventional wind power generator has poor running performance, low wind utilizing ratio, and inconvenient assembly, maintenance and transportation, three schemes are provided; a first scheme is as follows: a vertical generator is a multi-winding variable-pole vertical asynchronous generator; a fan support has a frustum-shaped structure; the vertical generator is arranged on the fan support, connected with a vertical speed increaser and controlled by an exciting intelligent grid-connected control system; the lower end of a vertical crankshaft is connected with the vertical speed increaser through a shaft coupler; an electromagnetic brake is installed on the lower end surface of an upper frame and sleeved on the vertical crankshaft; a single vane of a vane system has a vertical shutter structure; a second scheme is as follows: the single vane of the vane system has a transverse shutter structure; and a third scheme is as follows: the single vane of the vane system has a streamline structure. The multi-winding variable-pole variable-speed vane-type vertical wind power generating system is applied to wind power generation.

The invention belongs to the technical field of wind power plants and discloses a wind power plant optimizing dispatching method for reducing mechanical loss of wind generating sets. The method includes the steps that firstly, numerical simulation is carried out under different wind conditions and different loading conditions to acquire the frequency of cyclic loading applied on different major parts under the different loading conditions; secondly, the cycle frequency generated when materials of the major parts are damaged under the different loading conditions is worked out, and then unit relative damage values of the major parts under the different loading conditions are acquired based on the linear cumulative damage theory; thirdly, optimizing calculation is carried out on combination and dispatching of wind generating sets in a wind power plant through the particle swarm optimization algorithm to obtain a combination of the wind generating sets in the wind power plant where mechanical damage of the major parts of the wind generating sets is smallest. According to the method, through reasonable combination and dispatching of the wind generating sets, output power is guaranteed, adverse effects of start, stop, switching and the like of the wind generating sets on the service life of the wind generating sets are reduced, and the operating cost of an electric system is reduced.

A method and device for regulating the converter of a wind turbine in a wind farm are proposed. The method includes acquiring real-time voltage and current signals of a grid-connected point; acquiring real-time status information of each wind turbine on the same collector line of a wind farm; and generating unified control instructions based on the acquired real-time voltage and current signals and real-time status information. Wherein, the real-time status information includes the total number of three-phase bridge arms of the wind turbine converters running on the same collector line of the wind farm, and the dynamically allocated information for the running wind turbine converters and their three-phase bridge arms. number and the real-time power of each running wind turbine. Wherein, the unified control instruction includes a control instruction for each running wind turbine converter, wherein the control instruction includes a phase shift angle of the carrier wave required for control of each three-phase bridge arm in the converter Reference value, carrier ratio reference value, and modulated wave characteristic quantity reference value.

The present invention relates to the field of floating photovoltaic technology, in particular to a floating photovoltaic system capable of reducing the impact of grid connection on the power grid, including an air compressor, a heat exchange box, a gas storage device, a photovoltaic panel, an expander, a generator, a water supply system and an external Heating system; the air storage device has a chamber, the air compressor is connected to the air inlet of the heat exchange box, the air outlet of the heat exchange box, the air storage device, and the expander are connected in sequence, the expander is connected to the generator, and the air is compressed A first valve is set on the connecting pipeline between the machine and the heat exchange box, and a second valve is set on the connecting pipeline between the gas storage device and the expander; the photovoltaic panel is set above the gas storage device; the water supply system and the heat exchange box The water inlet is connected, and the external heating system is connected to the water outlet of the heat exchange box. The device uses the lower space of the photovoltaic panel to install the gas storage device, and uses it as a supporting component of the photovoltaic on the water, so as to achieve the full utilization of the photovoltaic system on the water, establish the integrated technology of power generation and energy storage, and improve the ability of photovoltaic grid connection.

The invention discloses a micro-grid voltage disturbance control method with voltage harmonic compensation, and belongs to the field of electrical technology. According to the invention, droop control, proportional resonance control and harmonic compensation control are mainly employed for a plurality of inverters in parallel connection. When a micro-grid voltage fluctuates, reactive power is uniformly divided through droop control, and a disturbance voltage is adjusted. Also, the high-order harmonic wave of the micro-grid voltage can be extracted through detection, the first-order elimination is carried out through proportional resonance control, and then the second-order elimination is carried out through the harmonic compensation control. Finally, the above results are outputted in a voltage mode through a PWM control inverter. The method can effectively improve the operation characteristics of an intermittent and unstable power supply in real time, also can adjust the voltage disturbance and the harmonic voltage, achieves the effects of voltage stabilization and voltage harmonic elimination, improves the capability of micro-grid regulation and control, improves the stability and reliability of the micro-grid operation, and improves the grid-connected capability of a micro-grid.