36results about How to "Increased power transfer capability" patented technology

The invention discloses a parameter tuning method of a damping controller of a wind farm side based on a wide area measurement system signal, and can effectively inhibit the interval low-frequency oscillation in a system, improve a transmission capacity of a call wire, replace a traditional synchronous generator PSS (Power System Stabilizator) and improve the voltage control. The parameter tuning method comprises the following steps of: 1) adding an excitation signal at the input end of the system and carrying out signal collection at the output end for system identification; 2) utilizing a Prony analysis method to carry out identification on a power transmission system containing a double-fed wind electric field and determining an open-loop transfer function which is not introduced with an additional damping control; 3) on basis of the step 2), utilizing a retention index to select a feedback signal utilized by the additional damping control and a mounting position of the additional damping control; and 4) on basis of the steps 2) and 3), utilizing the open-loop transfer function of the system to tune phase compensation link parameters in an additional damping control link; and drawing a root locus picture of a closed-loop transfer function and determining a gain value K of an additional damping controller.

The invention discloses isolation type new energy power supply equipment based on a three-port power converter. The isolation type new energy power supply equipment consists of a new energy battery, an energy storage device, an inverse resistance diode, two coupling inductors, four main switching tubes, two clamping switching tubes, two clamping capacitors, two rectifier diodes and two filter capacitors which are mutually connected. By adoption of a staggered parallel structure, the phases of the main switching tubes are controlled, and low ripples of the input current can be realized, so that the maximum power point tracking control of the new energy battery is easily realized; and meanwhile, by adoption of an active clamping structure, soft switching of the main switching tubes can be realized, so that the loss is reduced, and the efficiency is improved. In addition, by adoption of the series structure of two coupling inductors on the load side, high boosting capacity can be realized; the new energy battery can supply power to the load side and can supply power to a storage battery during operation; and when the new energy battery does not work, the new energy battery also can supply power to the load side through the storage battery.

The invention relates to a non-contact power supply primary circuit with a current expanding function. The non-contact power supply primary circuit comprises an inverter and a primary coil, wherein a primary compensating circuit is connected between the inverter and the primary coil. The primary compensating circuit comprises a first inductor, a first capacitor and a second inductor, wherein one end of the first inductor is connected with the output anode end of the inverter, the other end of the first inductor is connected with one end of the first capacitor and a first end of the second inductor, a second end of the second inductor is connected with one end of the compensating circuit through the primary coil, and the other end of the compensating circuit is connected with the other end of the first capacitor and the output cathode end of the inverter. The compensating circuit compensates inductance in the primary coil, and a resonance circuit is formed between the compensating circuit and the primary coil to enable the first inductor, the first capacitor and the second inductor to form the circuit with the current expanding function. The non-contact power supply primary circuit with the current expanding function can achieve constant control of currents of primary cables, has the current expanding function and is wide in application range and safe and reliable.

A wind-power trend optimizing system based on fast energy storage and a control method thereof belong to the technical field of wind-power power adjustment control in the new energy power generation technology. The wind-power trend optimizing system based on fast energy storage comprises a storage battery pack (1), a direct current power adjustment system (2), a super-capacitor group (3) and an alternating current and direct current power adjustment system (4). The direct current power adjustment system (2) adopts a plurality of groups of shunt-wound bidirectional Buck-Boost current transformation topologies, the storage battery pack (1) is located on the low voltage side of the direct current power adjustment system (2), the super-capacitor group (3) is located on the high voltage side of the direct current power adjustment system (2), and an energy storage link is connected with a public power grid through the alternating current and direct current power adjustment system (4). The control method of the wind-power trend optimizing system based on fast energy storage comprises an energy storage power distribution control method and a trend optimizing control method, and relates to an energy storage component charging state system on a chip (SOC) zone division method and dynamic adjustment rules of energy flow between the system and the power grid. The wind-power trend optimizing system based on fast energy storage and the control method thereof can improve power grid electric energy quality and stability and safety of the system.

The invention provides a control method for maximum transmission power of a hybrid double-feed-in direct current power transmission system, which belongs to the field of hybrid direct current power transmission control of an electric power system. According to the method, firstly, a double-feed-in direct current power transmission system model is established, a per-unit value of the hybrid double-feed-in direct current power transmission system is selected and rated operating condition parameters are determined, and the model is solved. Through utilization of a linear relation between a voltage at an alternating current bus of a flexible direct current transmission VSC system and a current flowing from a VSC system converter station to the alternating current bus and equivalent impedance of a tradition direct current power transmission LCC side receiving end grid, two parameters are subjected to linear combination to obtain a virtual point voltage, and through fixed virtual point voltage control of a PI link, the VSC system automatically adjusts the output power for a change of the equivalent impedance of the LCC side receiving end grid, so that the hybrid double-feed-in direct current power transmission system outputs the maximum power under the strength of the receiving end grid. The method has the characteristics of reducing the control difficulty and improving the power transmission capability of the hybrid double-feed-in direct current power transmission system under the same strength of the receiving end grid.

The invention relates to a power transmission line utilization rate improving platform taking economic benefits and safety into integrated consideration. The platform comprises a database module (1), an input module (2), an analysis evaluation module (3) and an output module (4) which are successively connected, wherein the input module (2) obtains a power transmission line initial load, trend distribution and power equipment data from the database module (1) for transmitting to the analysis evaluation module (3), the analysis evaluation module (3) gradually increases the load loaded by a power transmission line, when the load exceeds a safety value, calculates a safety economic cost paid by the power transmission line and economic benefits obtained by the power transmission line and compares increment speeds of the two, and the output module (4) outputs a power transmission line utilization rate at the moment. Compared to the prior art, the actual operation condition of the power transmission line is taken into full consideration, the calculation precision is high, and economic benefits of the power transmission line are improved.

The embodiment of the invention discloses an online charging supplying device and method for a patrol unmanned aerial vehicle. The online charging supplying device comprises a control base station anda grouping control circuit, wherein the control base station is connected with an energy storage charging circuit through the grouping control circuit, and a push-pull inverter circuit, a full-bridgeuncontrollable rectifier circuit and a BUCK circuit are arranged in the energy storage charging circuit; and the output end of the push-pull inverter circuit is coupled with a first resonance coil through a transmitting coil, the first resonance coil is connected with a second resonance coil through magnetic coupling, and the second resonance coil is connected with the full-bridge uncontrollablerectifying circuit through a magnetic coupling receiving coil. According to the system, a dynamic tuning branch is adopted for compensating the change of the original-stage inherent resonant frequencyof the system, the resonance of the primary emission coil of the system is realized while the working frequency of the system is ensured to be constant, and therefore the power transmission capability of the whole coupling mechanism is improved; and the unmanned aerial vehicle can flexibly supply electric energy through the electromagnetic induction technology, so that the cruising ability of theunmanned aerial vehicle is improved.

The invention discloses a distributed type high-frequency conversion-based modular solid-state transformer and a control method therefor. The modular solid-state transformer comprises multiple cascaded modules; each module comprises two sub converters SCi1 and SCi2, a high-frequency transformer and an auxiliary inductor L, wherein i represents the i module; each sub converter consists of four power sub modules; the structure of the power sub module can be a half-bridge type structure or a full-bridge type structure; each half-bridge type structure comprises a capacitor, two IGBTs and adiode in anti-parallel connection with the IGBTs; each full-bridge type structure comprises a capacitor, four IGBTs and a diode in anti-parallel connection with the IGBTs; the input end of the transformer is in a high voltage; multiple modules are connected in series to be used as the input end; the output end of the transformer is in a low voltage; and multiple modules are connected in parallel to be used as the output end. By controlling the output voltage V<hi1> of the SCi1 and the output voltage V<hi2> of the SCi2, the flowing direction of the current i<hi1> can be controlled, and equivalently, power flowing direction control is realized, and voltage conversion and isolation are completed.