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Direct current voltage balancing circuit of reactive generating device based on chained invertor

A generation device, a technology of DC voltage, applied in the output power conversion device, the irreversible DC power input is converted into AC power output, the AC power input is converted into DC power output, etc., to achieve the effect of compensating for unbalance

Inactive Publication Date: 2004-07-21
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a DC voltage balance circuit of a reactive power generating device based on a chain-type inverter to solve the problem of DC voltage balance control and ensure the normal operation of the device

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  • Direct current voltage balancing circuit of reactive generating device based on chained invertor
  • Direct current voltage balancing circuit of reactive generating device based on chained invertor

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Embodiment Construction

[0018] The specific embodiments of the present invention will be described with reference to the accompanying drawings.

[0019] see figure 1 , This figure shows the principle block diagram of the one-phase DC voltage balance circuit in the three-phase chain inverter circuit of the reactive power generating device. In the figure, S1LA, S1LB, S1RA, S1RB and C1 constitute the first single-phase inverter (that is, a chain unit) of the chain inverter, and SNLA, SNLB, SNRA, SNRB and CN constitute the chain inverter. The Nth (N is a natural number greater than 1) single-phase inverter of the inverter. The DC voltage measuring instrument will measure the voltage across the capacitor Cn (n refers to the nth of the N single-phase inverters), send it to the pulse width regulator for comparison with the reference voltage VRn, and output the adjustment signal Pn (pulse width The modulation signal PWM) is amplified by the pulse amplifier and output to both ends of the capacitor Cn, so as to c...

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Abstract

Characters of the invented circuit are that each single-phase inverter includes following parts: voltage measuring apparatus for measuring voltage between two ends of capacitance at DC side of inverter; evaluator of minimum capacity voltage for determining minimum value among capacity voltages at DC side of each inverter, and the minimum value being as reference voltage of pulse width regulator; the pulse width regulator carrying out error adjusting between signal of measured capacity voltage at DC side and reference voltage; pulse amplifier for magnifying signal of pulse width modulation and adjusting voltage between two ends of capacitance at DC side of inverter. The invented circuit can compensate unbalanced voltage at DC side of reactive generating device, making equipment operate normally.

Description

Technical field [0001] A DC voltage balance circuit of a reactive power generating device based on a chain inverter belongs to the technical field of electrical automation equipment. Background technique [0002] Traditional reactive power compensation equipment includes synchronous cameras, fixed-capacity capacitors, switch-controlled shunt reactors, etc. These devices can meet a certain range of reactive power compensation requirements, but they have disadvantages such as slow response speed and difficulty in maintenance. The thyristor-type static var compensator (SVC) has good performance, but it also has the following main disadvantages: 1) Because it exhibits a constant impedance characteristic to the fluctuation of the grid voltage, it cannot be fully utilized when the grid voltage fluctuates. Its function; 2) Produce more harmonic current to the system. [0003] With the emergence of high-power semiconductor devices (GTO, IGBT, IGCT, IEGT), static synchronous compensator (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02M7/483H02M7/493
CPCY02E40/30
Inventor 刘文华耿俊成宋强帅军庆高芳祝达康
Owner TSINGHUA UNIV
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