CN205921381U

CN205921381U - Electric energy quality comprehensive control device based on three level topological structure on T type

Info

Publication number: CN205921381U
Application number: CN201620987732.9U
Authority: CN
Inventors: 杨威; 王化勇
Original assignee: LIAONING TUOXIN POWER ELECTRONIC Co Ltd
Current assignee: LIAONING TUOXIN POWER ELECTRONIC Co Ltd
Priority date: 2016-08-30
Filing date: 2016-08-30
Publication date: 2017-02-01
Anticipated expiration: 2026-08-30

Abstract

The utility model provides a to the electric wire netting constitute to pollute, more high power and the electric energy quality comprehensive control device based on three level topological structure on T type that administers of high efficiency operation's electric energy more, includes control system, power unit, the anti ware of three -phase alternating current, charging device, ac contactor, wave filter, circuit breaker in advance, control system is used for gathering bus current, busbar voltage and power unit output current, ac contactor is controlled by control system, power unit has three -phase output and imports the termination at the control system PWM output, the anti ware of three -phase alternating current, charging device, wave filter and circuit breaker are established ties at the power unit output in proper order, power unit includes by three bridge circuit that constitute of power components of group that the output of electric capacity mid point as the zero level is drawn forth to two electric capacity that the capacity is the same of both ends series connection, every group power component by four switching elements that the structure is the same according to anyhow each two constitute T type topology together, every T type topology is looks.

Description

Power Quality Comprehensive Treatment Device based on t type three-level topology structure

Technical field

This utility model is related to a kind of Power Quality Comprehensive Treatment Device based on t type three-level topology structure, extensively should For all kinds of power systems.

Background technology

At present in the field such as industry and civil power, mainly adopt the topological structure of two level, and two level topological structure exist The unfavorable factors such as big, output harmonic wave larger and less efficient is lost, this results in single device and is difficult to high-power operation, thus limiting Make the species of power quality controlling and there is pollution to electrical network to a certain extent.

Content of the invention

The purpose of this utility model is to provide a kind of electrical network do not constituted with pollution, can more power and higher efficiency run The complex control system that electric energy is administered, i.e. the Power Quality Comprehensive Treatment Device based on t type three-level topology structure.

The complex control system that the electric energy based on t type three-level topology structure that this utility model is related to is administered, including control System processed, power cell, three-phase alternating current reactance device, pre-charging device, A.C. contactor, wave filter, chopper, described control system System is used for gathering bus current, busbar voltage and power cell output current, and described A.C. contactor is by control system control, institute State power cell have three-phase output and input is connected to control system pwm outfan, described three-phase alternating current reactance device, charging Device, wave filter and chopper are sequentially connected in series in power cell outfan, and the other end of described chopper is ua, ub, uc bus Terminals, described charging device two ends are in parallel with the normally opened contact of A.C. contactor；Described power cell is included by three groups of power The bridge circuit of element composition, two capacity identical electric capacity of two ends series connection of bridge circuit；Two electric capacity are in the middle of three level DC support electric capacity, two capacitances in series are connected on positive and negative busbar, draw electric capacity midpoint as the output of zero level；Every group of work( Rate element forms t type topology, every switching device two by four structure identical switching devices according to each two anyhow together End is parallel with reversal connection diode, and each t type topology is a phase；By every phase breaker in middle device of being connected with electric capacity midpoint and its simultaneously Neutral point clamper over the ground realized by the reversal connection diode of connection, makes every mutually acquisition tri- kinds of level of p, o and n.

Described switching device is igbt.

The beneficial effects of the utility model are:

1st, power cell is the bridge circuit being made up of internal three groups of power components for t type topological structure, every group of power Element forms t type topology, every switching device two ends by four structure identical switching devices according to each two anyhow together It is parallel with reversal connection diode, each t type topology is a phase；It is parallel in electrical network, be equivalent to a variable current source, its output Electric current can flexibly control, and accesses electrical network finally by linked reactor.

2nd, this device provides the solutions such as reactive-load compensation, harmonic wave control, three-phase imbalance and electrical network flickering.

3rd, because the switching device voltage stress in three-level topology is only the half of two level topologys, therefore greatly reduce Switching loss and electromagnetic interference, reduce filter reactance loss and output ripple；And for i type three-level topology, t Type three level has less loss and less components and parts, thus improve work efficiency, makes the single device can be with larger work( Rate is run, and increased the species of power quality controlling.

Brief description

Fig. 1 is electrical schematic diagram of the present utility model；

Fig. 2 is power cell circuit theory diagrams in Fig. 1.

Specific embodiment

As illustrated, this utility model includes control system, power cell, three-phase alternating current reactance device, charging device, exchange Catalyst, emi wave filter, chopper, by control system control, described power cell has three-phase output to described A.C. contactor And be connected to control system pwm outfan, control system according to detection data real-time operation, using final operation result as Pwm outputs, to control the output of inverted power module.Described three-phase alternating current reactance device, pre-charging device, emi wave filter and disconnected Road device is sequentially connected in series in power cell outfan, and the other end of described chopper is ua, ub, uc bus terminals, described charging Device is made up of three pre-charge resistances ra, rb, rc, described pre-charge resistance ra, rb, rc two ends respectively with A.C. contactor Three normally opened contact parallel connections；Described power cell includes the bridge circuit being made up of three groups of power components, the two ends of bridge circuit Series connection two capacity identical electric capacity c1, c2；Described electric capacity c1, c2 are three level intermediate dc Support Capacitors, by two during wiring Individual capacitances in series is connected on positive and negative busbar, draws electric capacity midpoint as the output of zero level；Three groups of power components are respectively by four Structure identical switching device sa1, sa2, sa3 and sa4, sb1, sb2, sb3 and sb4 and sc1, sc2, sc3 and sc4, according to Anyhow each two form t type topology together, and every switching device two ends inverse parallel has diode, and each t type topology is a phase, The present embodiment breaker in middle device adopts igbt；By every phase breaker in middle device sa3, sb3, sc3 of being connected with electric capacity midpoint and its Neutral point clamper over the ground realized by reversal connection diode in parallel, makes every mutually acquisition tri- kinds of level of p, o and n.

The pt that described control system gathers bus current by ct1, inside is arranged is gathered busbar voltage, is gathered by ct2 Flow through the t type topology current in middle wire of neutral point and power cell output current is gathered by ct3, detected by control system Control chopper to disconnect during stream, realize overcurrent protection；Three-phase alternating current reactance device adopts the high frequency reactance of 0.2mh～0.5mh, it Effect is that filtering makes inverted power module export smoother waveform, reduces the switching harmonics in igbt output current, reduces altogether Mould disturbs, and realizes the buffering of energy；Pre-charge resistance adopts the high-power resistance of 100 ω, and when electricity on device, electrical network is to direct current Support Capacitor plays cushioning effect when charging, and when plant running, A.C. contactor is short-circuit by charging device, it is to avoid comprehensive control Device output current flows through charging device；Control system includes opening into detection module, outputs control module, detection calculations module, Open the current state predominantly detecting external devices into detection module；Output control module to be mainly used to control the dynamic of external devices Make, realized with magnetic latching relay；Detection calculations module according to sample detecting to data carry out real-time operation, by final fortune Calculate result to output as pwm, with the output of controlling switch device.

Claims

1. the complex control system that the electric energy based on t type three-level topology structure is administered, is characterized in that: includes control system, work( Rate unit, three-phase alternating current reactance device, pre-charging device, A.C. contactor, wave filter, chopper, described control system is used for adopting Collection bus current, busbar voltage and power cell output current, described A.C. contactor is by control system control, described power list Unit has three-phase output and input is connected to control system pwm outfan, described three-phase alternating current reactance device, charging device, filter Ripple device and chopper are sequentially connected in series in power cell outfan, and the other end of described chopper is ua, ub, uc bus terminals, Described charging device two ends are in parallel with the normally opened contact of the A.C. contactor being controlled by control system；Described power cell include by The bridge circuit of three groups of power component compositions, two capacity identical electric capacity of two ends series connection of bridge circuit；Two electric capacity are three Level intermediate dc Support Capacitor, two capacitances in series are connected on positive and negative busbar, draw electric capacity midpoint defeated as zero level Go out；Every group of power component forms t type topology by four structure identical switching devices according to each two anyhow together, opens for every Close device two ends and be parallel with reversal connection diode, each t type topology is a phase；By the every phase breaker in middle device being connected with electric capacity midpoint Neutral point clamper over the ground realized by the reversal connection diode of part and its parallel connection, makes every mutually acquisition tri- kinds of level of p, o and n.

2. the complex control system that the electric energy based on t type three-level topology structure according to claim 1 is administered, its feature It is: described switching device is igbt.