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Circuit topology structure of large-power charging/discharging system and control method of structure

A circuit topology, charge and discharge technology, applied in the direction of output power conversion device, reactive power adjustment/elimination/compensation, AC power input conversion to DC power output, etc.

Active Publication Date: 2019-06-04
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of direct parallel connection of inverters in the current charging and discharging system circuit and the existence of circulating currents between modules, and proposes a high-power charging and discharging system circuit topology and control method

Method used

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  • Circuit topology structure of large-power charging/discharging system and control method of structure
  • Circuit topology structure of large-power charging/discharging system and control method of structure
  • Circuit topology structure of large-power charging/discharging system and control method of structure

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specific Embodiment approach 1

[0027] Specific implementation mode one: the following combination figure 1 Describe this embodiment, a high-power charging and discharging system circuit topology described in this embodiment, which includes n EMI filter circuits 1, n TNPC circuits 2, n DC / DC conversion circuits 3, and a dead zone controller 4 , hysteresis comparator 5, multiplier 6, PID controller 7 and circulation controller 8;

[0028] An EMI filter circuit 1 is connected in series with a TNPC circuit 2 and a DC / DC conversion circuit 3 to form a set of converter circuits, and n sets of converter circuits are connected in parallel and then connected in series between the power grid and the load;

[0029] The voltage signal input terminal of the circulating current controller 8 inputs the preset DC voltage Ud * ; 0-t time, the circulation controller 8 simultaneously inputs the feed-forward control signal to the control signal input end of the TNPC circuit 2 of each group of converter circuits;

[0030] Aft...

specific Embodiment approach 2

[0036] Specific implementation mode two: the following combination figure 2Describe this embodiment. This embodiment further describes the circuit topology of a high-power charging and discharging system described in Embodiment 1. It also includes a dead zone controller 4, and the signal input terminal of the dead zone controller 4 is connected to the circulating current The feedforward signal output terminal of the controller 8 and the signal output terminal of the hysteresis comparator 5 .

specific Embodiment approach 3

[0037] Specific implementation mode three: the following combination figure 2 Describe this embodiment, this embodiment will further explain the circuit topology of a high-power charging and discharging system described in Embodiment 1 or 2, EMI filter circuit 1 includes a resistor Ra, a resistor Rb, a resistor Rc, a capacitor Ca, and a capacitor Cb , capacitance Cc, inductance La1, inductance La2, inductance Lb1, inductance Lb2, inductance Lc1 and inductance Lc2;

[0038] One end of the inductor La1 is connected to the output terminal of the a-phase power supply of the AC power supply, the other end of the inductor La1 is connected to one end of the resistor Ra and one end of the inductor La2 at the same time, and the other end of the resistor Ra is connected to one end of the capacitor Ca;

[0039] One end of the inductor Lb1 is connected to the b-phase power output terminal of the AC power supply, the other end of the inductor Lb1 is connected to one end of the resistor Rb...

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Abstract

The invention relates to a circuit topology structure of a large-power charging / discharging system and a control method of the structure, belongs to the technical field of power electronic technology,and aims at solving the problem that inverters in a present charging / discharging system circuit are connected in parallel directly and there is ring current among modules. Multiple converter circuitsare connected in parallel according to practical requirements, so that the output power of a current transformer is improved greatly. a zero-sequence component current is injected to the converter circuits, the ring current among the parallel-connected modules is inhibited effectively, the working efficiency of the parallel-connected current transformer is improved, and an intermediate potentialof a three-level structure is kept balanced. The structure can be used as a power electronic converter.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a charging and discharging system circuit topology and method. Background technique [0002] The performance of the power electronic converter directly affects the power quality of the connected grid and the working environment. Since the harmonic sources in the power grid mainly come from various converter devices, it is particularly important to control the voltage, current and output performance of various converter devices. Improving the working performance of the converter devices has become a key to control the harmonic pollution of the power grid. Important aspects and research hotspots. [0003] The three-level converter with T-type NPC structure is widely used because of its high efficiency and less switching devices. In order to realize the capacity expansion of the static synchronous compensator, multiple inverters can be directly connected in p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02M7/81H02J3/26H02J3/18
CPCY02E40/30Y02E40/50
Inventor 吴晓刚杨宸
Owner HARBIN UNIV OF SCI & TECH
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