High-power density island interactive UPS and comprehensive control method thereof
A high power density, comprehensive control technology, applied in electrical components, AC networks to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as less consideration of harmonics and reactive power pollution, and achieve harmonic compensation. The effect of reactive power pollution, simple circuit and high efficiency
Active Publication Date: 2019-08-20
GUANGDONG ZHICHENG CHAMPION GROUP
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Problems solved by technology
The traditional UPS seldom considers the harmonics and reactive power pollution caused by nonlinear loads, and the reasonable switching of charging and discharging of energy storage batteries and controlling DC side voltage
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[0028] figure 1 It is a schematic structural diagram of a high power density sea-island interactive UPS according to an embodiment of the present invention, including a filter, a static switch, an inverter, a rectifier, a transformer, an energy storage battery pack, and a controller; the filter is connected to the mains output terminal, The static switch is connected between the output terminal of the filter and the input terminal of the transformer; the inverter and the rectifier are connected to two isolated ports of the transformer, and the energy storage battery pack is connected to the DC bus of the two converters; The controller is connected with the sampling circuit and the drive protection circuit of the converter; the two converters both adopt an H-bridge structure composed of IGBTs. The control system includes a controller, a sampling circuit and a drive protection circuit.
[0029] figure 2 and image 3 It is a high power density sea-island interactive UPS contr...
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The invention discloses a high-power density island interactive UPS and a comprehensive control method thereof. When the island power supply is normal, a power supply supplies power to a load througha filter, a static switch and a transformer; and a UPS inverter is used for controlling and compensating the island power supply voltage and improving the voltage quality. A UPS rectifier is used forcontrolling charging and discharging of the battery and simultaneously solving the problems of harmonic pollution and reactive injection of a power grid caused by nonlinear load access. When the island power supply fails, an energy storage battery pack supplies power, and two converters output power supply voltages together to supply continuous and reliable voltages for the load. Under the workingcondition, because the outputs of the two converters are connected in parallel, the current stress borne by each converter is reduced by half, and therefore, the power density is higher than that ofa conventional UPS. The high-power density island interactive UPS and the comprehensive control method thereof can reduce the capacity and the volume of the UPS device and can be widely applied to occasions with large harmonic pollution and high requirement on the reliability of a power supply.
Description
technical field [0001] The invention relates to the technical field of UPS control, in particular to a high power density sea-island interactive UPS comprehensive control method. Background technique [0002] With the further development of modern network technology and information industry, the loss caused by the interruption of power supply of important loads of many electronic equipment has become more and more serious. Uninterruptible Power Supply (UPS) can provide loads with continuous, high-quality, efficient and reliable AC power with protection and detection functions, and has been widely used in computer, communication, finance, transportation, national defense and electric power sectors. Applications. [0003] As more and more nonlinear loads are connected to the island power system, the harmonic pollution of the island power system is becoming more and more serious. The flood of harmonics affects the safe and economic operation of the power grid, and the harmonic...
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IPC IPC(8): H02J3/01H02J9/06
CPCH02J3/01H02J9/062H02J9/067Y02E40/40
Inventor 罗安刘一峰周小平何志兴陈燕东戴瑜兴周乐明徐千鸣谢志为李民英
Owner GUANGDONG ZHICHENG CHAMPION GROUP