Comprehensive dynamic compensating device for distribution network
A technology of integrated dynamic and compensation devices, applied in reactive power compensation, harmonic reduction devices, reactive power adjustment/elimination/compensation, etc., can solve problems such as poor output characteristics, large footprint, and high active power loss
Inactive Publication Date: 2008-04-16
SIEYUAN QINGNENG ELECTRICAL & ELECTRONICS
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Problems solved by technology
However, the passive compensation device is composed of impedance components, which has the disadvantages of slow response speed (about 100-200ms), poor output characteristics, high active power loss, and large footprint, and the treatment effect is often not ideal.
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Embodiment Construction
[0018] figure 1 It is the main circuit diagram of the distribution network dynamic compensation device of the present invention.
[0019] The power distribution cabinet (1) provides DC 220V, AC 220V and AC 380V power for various parts of the device (such as system power supply, water cooling system, etc.), and is equipped with 10kV voltmeter, reactive power meter, ammeter and other meters for indicating The operating status of the device. After the power is turned on, the control unit (5), monitoring unit (7) and protection unit (6) of the device start to work to monitor and protect the whole process of starting, grid connection, operation and exit of the device.
[0020] Before the device is connected to the grid, start the rectifier cabinet (2) to boost the AC 380V and perform controllable rectification, and raise the voltage of the capacitor bank (4) connected to the DC side of the inverter bridge to the required value, and the inverter bridge (3) Invert the DC side volta...
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Based on change of load, and dynamic output idle work in large range, the disclosed compensating device filters off harmonic in order to reach purposes: raising power factor, compensating asymmetric three phases, lowering flicker, and harmonic distortion rate so as to reduce loss of distribution network, and improve quality of power supply. The compensating device includes inversion bridge, and control unit. Through connection transformer being connected to distribution network, and connected to capacitor bank directly, the inversion bridge is in bridge structure of three levels and three single phases. Using direct current control algorithm based on phase-shifting carrier wave, the control unit collects bus voltages and currents from PT and CT on bus, as well as output current of device from CT of device, and DC voltage from capacitor bank to generate wave form in pulse-width modulation in order to control on / off of each power electronic device in the inversion bridge.
Description
technical field [0001] The invention relates to a power system and power electronics, in particular to a comprehensive dynamic compensation device for a power distribution network in the power system. Background technique [0002] Some loads will significantly deteriorate the power quality of public connection points, such as rolling mills, electric arc furnaces, large-scale rectification equipment, motor groups, etc., which will cause frequent reactive power impacts and harmonic pollution, not only leading to low power factors, but also Deteriorating various power quality indicators of public connection points (including voltage fluctuation, voltage flicker, three-phase asymmetry and harmonic distortion rate, etc.). [0003] At present, traditional passive compensation devices are used in domestic distribution networks to control and improve power quality. However, the passive compensation device is composed of impedance components, which has disadvantages such as slow res...
Claims
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IPC IPC(8): H02J3/18H02J3/16H02J3/01H02J3/26
CPCY02E40/34Y02E40/50Y02E40/30Y02E40/40
Inventor 张春朋沈斐李刚赖宇翔裴志宏
Owner SIEYUAN QINGNENG ELECTRICAL & ELECTRONICS