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Circuit topology and control method of a high-power charging and discharging system

A charge-discharge, high-power technology, applied in the field of charge-discharge system circuit topology

Active Publication Date: 2020-11-03
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 and control method of a high-power charging and discharging system
  • Circuit topology and control method of a high-power charging and discharging system

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specific Embodiment approach 1

[0027] Specific implementation mode 1: the following combination figure 1 To explain this embodiment, the circuit topology of a high-power charging and discharging system described in this embodiment includes n EMI filter circuits 1, n TNPC circuits 2, n DC / DC conversion circuits 3, and dead zone controller 4 , Hysteresis comparator 5, multiplier 6, PID controller 7 and circulating current 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 groups of converter circuits are connected in series between the power grid and the load in parallel;

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

[0030] After time t, st...

specific Embodiment approach 2

[0036] Specific implementation manner 2: the following combination figure 2 To illustrate this embodiment, this embodiment further explains the circuit topology of a high-power charging and discharging system described in the first embodiment, and also includes a dead zone controller 4 whose signal input terminal 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 manner three: the following combination figure 2 To explain this embodiment, this embodiment further explains the circuit topology of a high-power charging and discharging system described in Embodiment 1 or 2. The EMI filter circuit 1 includes a resistor Ra, a resistor Rb, a resistor Rc, a capacitor Ca, and a capacitor Cb. , Capacitor Cc, inductor La1, inductor La2, inductor Lb1, inductor Lb2, inductor Lc1, and inductor Lc2;

[0038] One end of the inductor La1 is connected to the a-phase power output terminal 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 end of the AC power source, the other end of the inductor Lb1 is connected to one end of the resistor Rb and one end of the inductor Lb2 ...

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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 specifically relates to a circuit topology structure and a method of a charging and discharging system. Background technique [0002] The performance of the power electronic converter directly affects the power quality of the connected grid and working environment. Since the harmonic sources in the power grid mainly come from various converter devices, the control of the voltage, current and output performance of various converter devices has become particularly important. Improving the working performance of converter devices has become one of the ways to control harmonic pollution in 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 few switching devices. In order to realize the expansion of the static synchronous compensator, multiple inverters can be directly connecte...

Claims

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Application Information

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Patent Type & Authority Patents(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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