An air conditioning system that includes desiccant compartments for holding a desiccant; a heat exchanger, a blower and a vessel. The heat exchanger can be filled with a heat transfer medium, while the blower blows ambient air by the heat exchanger such that the blown air is cooled and the heat exchanger is warmed such that thermal energy increases and is transferred from the air to the heat transfer medium causing the heat transfer medium to turn into vapor. The vapor is then diffused to one of the desiccant compartments such that the vapor is adsorbed onto the desiccant creating a mixture. Then an energy source is applied to the mixture such that the vapor and desiccant are separated. The separated vapor is transported to the vessel where it is condensed and then sent back to the heat exchanger, such that the system is able to be continuously operating.

Air-conditioning system

Transformer direct current magnetic bias compensation device with reactive power compensation function and control method

The utility model relates to a novel power transformer control system with a direct current magnetic bias compensation function. The novel power transformer control system includes a reactor, a PWM controlled rectifier, a single-phase inverter, a capacitor, a positive magnetizing control contactor, a negative magnetizing control contactor, a demagnetization control contactor and a CPU which are connected with a power grid, wherein the PWM controlled rectifier, the single-phase inverter, the positive magnetizing control contactor, the negative magnetizing control contactor and the demagnetization control contactor are all connected with the CPU. According to the system, a conversion function of magnetic properties of a two-phase magnetic material is utilized, so that a transformer itself has a capacity of inhibiting direct current magnetic bias. The novel power transformer control system can assist in eliminating the defects caused by traditional methods for inhibiting direct current magnetic bias, ensuring reliable earthing of a neutral point of the transformer, and improving the reliability and safety of the operation of the power grid and the transformer; and the novel power transformer control system is of great practical significance for a whole power system.

Novel power transformer control system having direct current magnetic biasing compensation function

The invention discloses a dynamic reactive compensation control method applied to an alternating current and direct current hybrid transmission power grid. For a dynamic reactive compensation device in the alternating current-direct current hybrid transmission power grid, important alternating current section line power is selected as a wide area input signal of an additional controller, parameters of the additional controller are set according to a control aim, an output signal of the additional controller is superposed with an output signal of a master controller to generate a dynamic reactive power signal, and the dynamic reactive power signal is output to a low-voltage bus of a transformation substation to enhance the transient stability and dynamic damping level of first oscillation of a system. Actual requirements on reactive power when the system has an alternating current failure and a direct current failure can be truly reflected, and the transient and dynamic stability of the system after an alternating current failure and a direct current locking failure of the alternating current-direct current hybrid transmission power grid can be improved.

Dynamic reactive compensation control method applied to alternating current-direct current hybrid transmission power grid

The invention provides a power transformer with a magnetic bias compensating function and a control system. A transformer body comprises an iron core and a winding. The iron core comprises a transformer core pillar, a side pillar and a compensation iron core on the side pillar. The winding is composed of a primary transformer test winding and a secondary transformer test winding. The control system is composed of a reactor, a PWM controllable rectifier, a capacitor, a detection winding and a control winding, wherein the reactor, the PWM controllable rectifier, the capacitor, the detection winding and the control winding are connected through a grid. The direct-current magnetic bias can be detected through a Hall current sensor by the whole transformer and the control system, the compensation iron core is magnetized through the control winding to counteract the direct-current magnetic flux, the aim of accurately restraining the direct-current magnetic flux in real time by the transformer is achieved, reliable grounding of a transformer neutral point is ensured, the reliability of safe operation of a power grid and the transformer is improved, and great practical significance is achieved on a whole power system.

Power transformer with magnetic bias compensating function

The utility model relates to a transformer direct-current magnetic biasing compensating device with a reactive compensation function, comprising a PWM (Pulse Width Modulation) rectifier which is connected with a power grid by a reactor, the PWM rectifier serving as an alternating current side is connected with a direct current side in parallel, the direct current side, a transformer, a neutral line Hall current sensor and a CPU (Central Processing Unit) are sequentially connected; PLLs (Phase Locking Loops) are connected between the power grid and the CPU and between the reactor and the CPU. In the utility model, on the basis of static reactive compensation, a structure for inhibiting direct-current magnetic biasing is additionally arranged, the study on restraining direct-current magnetic biasing is considered in a large power grid, direct-current magnetic biasing is inhibited, normal operation of the power grid is not affected, so as to realize two efficacies by one device, reduce the cost of the device for inhibiting direct-current magnetic biasing, obtain certain economic benefit and have great valuable significance for the whole electric power system.

Bai Baodong

Papers

Transformer direct current magnetic bias compensation device with reactive power compensation function and control method

Transformer direct-current magnetic biasing compensating device with reactive compensation function