CN203871860U - Active electric energy quality comprehensive adjusting device - Google Patents

Abstract

The utility model relates to an active electric energy quality comprehensive adjusting device, wherein a secondary mounting board unit is supported and fixed through a secondary mounting board. The upper part and the lower part of the back surface of a cabinet body are respectively with a wire inlet board. A first layer in the cabinet body is provided with a power unit, a DC capacitor unit and a fan. The power unit and the DC capacitor unit are separated from each other. The power unit is arranged at the front surface of the cabinet body at a part which is next to a cabinet door. The lower part of the DC capacitor is provided with the fan. A second layer in the cabinet body is provided with a reactor L2 and a secondary mounting board unit which is arranged below the power unit. A third layer in the cabinet body is provided with a reactor L1 and a filtering capacitor. A bottom layer in the cabinet body is provided with a contactor and a circuit breaker unit. The active electric energy quality comprehensive adjusting device is advantageous in that: the power unit and the DC capacitor unit are arranged separately, thereby facilitating respective capacitance enlarging; modular design, high power density and small volume is realized, and length of a connecting busbar is reduced; insulated protection between a main loop and a control system is realized, namely a dustproof, moisture-proof, salt-mist-proof and anti-static function is realized.

Description

A kind of active power quality comprehensive regulating device

Technical field

The utility model belongs to power quality controlling equipment field, relates in particular to a kind of active power quality comprehensive regulating device.

Background technology

Be accompanied by the raising of national economy strength and the development fast of power industry, large power power electronic appliance is progressively widely used in industry, and the idle and harmonic pollution therefore producing is also day by day serious.

Nowadays the high-power switch device of various power electronic equipments is all worked under nonlinear state, this not only makes the power factor of network system reduce to a certain extent, and a large amount of harmonic currents is also injected in electrical network, form huge Electric Power Disserve, cause the unsteadiness of electrical network, dangerous and waste, for this reason, idle and harmonic wave control has important practical significance.

Tradition reactive power compensation and harmonic decrease devices and technology, can reach the object of reactive power compensation and harmonic wave control, but have defect, can be summarized as:

(1) treating some special idle harmonious wave energy enough simply administers;

(2) existing technology can not be processed idle and harmonic wave in same device simultaneously;

(3) design of legacy equipment structure is loose, and volume is large, and power consumption own is large, and non-ferrous metal consumptive material is also more, has increased production cost.

(4) apparatus control system is easily subject to electromagnetic interference, affects the steady operation of equipment.

(5) equipment is easily subject to the impact of ambient temperature, humidity, salt fog and static, causes the fault such as apparatus overheat, partial discharge.

(6) device structure design is complicated, and production efficiency is low, maintain and replace inconvenience.

(7) linearity harmonic number frequently being changed or the filter effect of nonlinear load are not fine;

Along with the development of modern power electronics technology, people adopt Active Power Filter-APF to substitute passive filter.

Active Power Filter-APF divides to use separately and mix and uses two large classes, and when General Requirements, independent use can meet the demands, and it uses separately, divides again parallel connection type and tandem type.At present, because load access electrical network is parallel with main circuit, so claim that this mode is parallel connection type.This form is that Active Power Filter-APF is the most a kind of, is also the widest one of current range of application.But the cabinet body structure of existing parallel connection type active electric filter is huge, and oneself power consumption is large, harmonic filtration scope is little, response speed is slow, can not administer multiple power quality problem, without automatic current limiting operation function simultaneously, degree of intelligence is low, only has the shortcomings such as simulation demonstration.

Summary of the invention

For overcoming the deficiencies in the prior art, the purpose of this utility model is to provide a kind of active power quality comprehensive regulating device, realizes idle and harmonic wave control simultaneously, reduces volume in overall structure.

For achieving the above object, the utility model is achieved through the following technical solutions:

A kind of active power quality comprehensive regulating device, comprise cabinet, power cell, protective plate, breaker unit, secondary installing plate unit, DC capacitor unit, blower fan, reactor L1, reactor L2, filter capacitor, contactor, secondary installing plate unit supports fixing by secondary installing plate, secondary installing plate is made by sheet metal; Cabinet top is provided with louver(-vre), and bottom is provided with ventilating blind, and the front of cabinet outside is provided with cabinet door, and cabinet upper rear portion and bottom are equipped with inlet wire plate; In cabinet, be divided into four-layer structure, ground floor is provided with power cell, DC capacitor unit, blower fan, and power cell and DC capacitor unit are split-type structural, and it is positive near cabinet door place that power cell is arranged on cabinet, and DC capacitor bottom is provided with blower fan; The second layer is provided with reactor L2 and secondary installing plate unit, and secondary installing plate unit is arranged on power cell bottom; The 3rd layer is provided with reactor L1, filter capacitor; Bottom is provided with contactor and breaker unit, in described cabinet front cabinet door, is provided with protective plate, and power cell outside is provided with protective cover; Described protective plate and protective cover all adopt resin material to make.

On the circuit board of described secondary installing plate unit, be coated with three anti-enamelled coatings.

Described outside, DC capacitor unit is provided with fin.

Described power cell comprises IGBT module, drives keyset, radiator, and IGBT module is connected with driving keyset, and IGBT module is with driving keyset all by radiator heat-dissipation, and described radiator is made up of the heating panel of several dentalations.

Compared with prior art, the beneficial effects of the utility model are:

1, power cell and direct current capacitor unit, for split-type structural designs, are easy to realize respectively dilatation;

2, adopt modularized design, power density is high, and volume is little, reduces and connects busbar length, and non-ferrous metal consumption is little;

3, adopt mean value carrier modulation technology, equipment itself does not produce humorous wave interference;

4, adopt the protective plate of degradable nonmetallic materials, realized the isolating and protecting of major loop and control system, i.e. dustproof, damp proof, anti-salt fog and antistatic.Meanwhile, ensure the smooth and easy and security of operation of ventilation and heat;

5, major loop and control system have adopted the design of secondary installing plate cellular construction to realize the worn-out isolation of screen, anti-electromagnetic interference;

6, built-in blower fan, can realize malleation low noise and ventilate and high efficiency and heat radiation;

7, rack is upper and lower, is all designed with inlet wire jockey, and realization can inlet wire compatibility entirely.

Brief description of the drawings

Fig. 1 is main circuit schematic diagram of the present utility model.

Fig. 2 is the outside drawing of cabinet door.

Fig. 3 is front view of the present utility model.

Fig. 4 is right view of the present utility model.

Fig. 5 is rearview of the present utility model.

Fig. 6 is power cell structure schematic diagram.

Fig. 7 is the heat spreader structures schematic diagram of power cell.

Fig. 8 is secondary installing plate cellular construction schematic diagram.

Fig. 9 is stereogram of the present utility model.

Figure 10 is stereogram of the present utility model (unshielded plate).

Figure 11 is air channel of the present utility model schematic diagram.

Figure 12 is voltage, the current phasor figure in alpha-beta coordinate system.

Figure 13 is harmonic wave and Detecting Reactive Current theory diagram.

In figure: 1-cabinet 1-1 touch screen 1-2 scram button 2-power cell 2-1IGBT module 2-2 drives 5-1 secondary installing plate 5-2 master control borad 5-3 direct voltage sampling plate Holl-PT 5-4 three phase rectifier bridge module 5-575W Switching Power Supply 5-6 rectifier 5-7150W Switching Power Supply 5-8 relay 5-9 three-phase transformer 5-10 air switch 5-11 contactor 5-12 charging resistor 6-DC capacitor unit, keyset 2-3 radiator 3-protective plate 4-breaker unit 5-secondary installing plate unit 7-blower fan 8-L2 reactor 9-L1 reactor 10-filter capacitor 11-main contactor 12-inlet wire jockey.

Embodiment

Below in conjunction with Figure of description, the utility model is described in detail, but should be noted that enforcement of the present utility model is not limited to following execution mode.

See Fig. 1-Figure 11, a kind of active power quality comprehensive regulating device and detection algorithm thereof, comprise cabinet 1, power cell 2, protective plate 3, breaker unit 4, secondary installing plate unit 5, DC capacitor unit 6, blower fan 7, L1 reactor 9, L2 reactor 8, filter capacitor 10, main contactor 11, secondary installing plate unit 5 supports fixing by secondary installing plate 5-1, secondary installing plate 5-1 is made by sheet metal;

Cabinet 1 top is provided with louver(-vre), and bottom is provided with ventilating blind, and the front of cabinet 1 outside is provided with cabinet door; Cabinet 1 upper rear portion and bottom are equipped with inlet wire jockey 12;

In cabinet 1, be divided into four-layer structure, ground floor is provided with power cell 2, DC capacitor unit 6, blower fan 7, wherein, power cell 2 is split-type structural with DC capacitor unit 6, it is positive near cabinet door place that power cell 2 is arranged on cabinet 1,6 outsides, DC capacitor unit are provided with fin, and DC capacitor bottom is provided with blower fan 7; The second layer is provided with L2 reactor 8 and secondary installing plate unit 5, and secondary installing plate unit 5 is arranged on power cell 2 bottoms; The 3rd layer is provided with L1 reactor 9, filter capacitor 10; Bottom is provided with main contactor 11 and breaker unit 4, in described cabinet 1 front cabinet door, is provided with protective plate 3, and power cell 2 outsides are provided with protective cover; On the circuit board of described secondary installing plate unit 5, be coated with three anti-enamelled coatings.

Protective plate 3 all adopts degradable nonmetallic materials to make with protective cover, by laser engraving technique once-forming, is suitable for a small amount of processing, low processing cost compared with mold.

Power cell 2 comprises IGBT module, drives keyset, radiator, wherein, IGBT module is connected with driving keyset, and IGBT module is all passed through radiator heat-dissipation with driving keyset, described radiator is made up of the heating panel of several dentalations, sees Fig. 6, Fig. 7.

According to main circuit schematic diagram, grid bus is by circuit breaker Q F1 (breaker unit 4) inlet wire, circuit breaker Q F1 is connected with main contactor KM1 (label 11 in Figure 10), the output of main contactor KM1 is connected with net side inductance L 4, net side inductance L 4 three-phase output ends connect respectively inversion lateral capacitance L1, L2, L3 (DC capacitor unit 6), net side inductance L 4 three-phase output ends and inversion lateral capacitance L1, L2, between L3, be connected with filter capacitor CF and (see Fig. 4, 5, 9), inversion lateral capacitance L1, L2, L3 output respectively with current sensor HAT1, HAT2, HAT3 is connected, current sensor HAT1, HAT2, HAT3 is connected with three-phase converter module 2 respectively, on described main contactor KM1, be parallel with charging contactor KM2, grid bus earth connection is connected with filter capacitor CF, three-phase converter module 2.

Blower fan 7 is arranged on the middle part of cabinet 1, air is entered in cabinet by the ventilating blind that is arranged on cabinet 1 bottom, blower fan 7 extracts the air of cabinet 1 bottom surrounding, blowing to cabinet 1 top dispels the heat, finally by louver(-vre), hot-air is discharged, blower fan 7 is arranged in cabinet 1 middle part and has realized the ventilation of malleation low noise and high efficiency and heat radiation.

The detection algorithm that utilizes the quality of power supply of said apparatus realization to regulate, comprises the following steps:

1) instantaneous value of establishing three-phase voltage and electric current is respectively e _a, e _b, e _cand i _a, i _b, i _c, they are carried out to the conversion of abc/ alpha-beta, be transformed under the orthogonal rest frame of alpha-beta two-phase, can obtain two-phase instantaneous voltage e _α, e _βwith two-phase transient current i _α, i _β, see Figure 12:

$\left[\begin{array}{c}{e}_{\mathrm{\α}}\\ e_{\mathrm{\β}}\end{array}\right]=C_{2/3}\left[\begin{array}{c}{e}_a\\ e_b\\ e_c\end{array}\right]---\left(1\right)$

$\left[\begin{array}{c}{i}_{\mathrm{\α}}\\ i_{\mathrm{\β}}\end{array}\right]=C_{2/3}\left[\begin{array}{c}{i}_a\\ i_b\\ i_c\end{array}\right]---\left(2\right)$

In formula (1), (2) $C_{2/3}=\sqrt{2/3}\left[\begin{array}{ccc}1& -1/2& -1/2\\ 0& \sqrt{3}/2& -\sqrt{3}/2\end{array}\right];$

2) define to obtain formula (3) according to active power p and reactive power q

$\left[\begin{array}{c}p\\ q\end{array}\right]=\left[\begin{array}{cc}{e}_{\mathrm{\α}}& e_{\mathrm{\β}}\\ e_{\mathrm{\β}}& {-e}_{\mathrm{\α}}\end{array}\right]\left[\begin{array}{c}{i}_{\mathrm{\α}}\\ i_{\mathrm{\β}}\end{array}\right]=C_{\mathrm{pq}}\left[\begin{array}{c}{i}_{\mathrm{\α}}\\ i_{\mathrm{\β}}\end{array}\right]---\left(3\right)$

In formula (3) $C_{\mathrm{pq}}=\left[\begin{array}{cc}{e}_{\mathrm{\α}}& e_{\mathrm{\β}}\\ e_{\mathrm{\β}}& {-e}_{\mathrm{\α}}\end{array}\right];$

3) active power p, reactive power q obtain formula (4) through low pass filter LPF

Wherein for instantaneous active power, for instantaneous reactive power, 3E is three-phase instantaneous voltage, I ₁for transient current, for phase angle;

4) by can calculate sensed current i _a, i _b, i _cin fundametal compoment i _af, i _bf, i _cf

$\left[\begin{array}{c}{i}_{\mathrm{af}}\\ i_{\mathrm{bf}}\\ i_{\mathrm{cf}}\end{array}\right]=C_{3/2}{C}_{\mathrm{pq}}^{-1}\left[\begin{array}{c}\stackrel{\‾}{p}\\ \stackrel{\‾}{q}\end{array}\right]=\frac{1}{{3E}^2}{C}_{3/2}{C}_{\mathrm{pq}}\left[\begin{array}{c}\stackrel{\‾}{p}\\ \stackrel{\‾}{q}\end{array}\right]---\left(5\right)$

By i _af, i _bf, i _cfrespectively with i _a, i _b, i _csubtract each other, can draw i _a, i _b, i _charmonic component i _ah, i _bh, i _ch.Can set up harmonic wave and Detecting Reactive Current theory diagram, see Figure 13, in figure:

E _a, e _b, e _c-input voltage instantaneous value;

I _a, i _b, i _c-input current instantaneous value;

I _ah, i _bh, i _ch-output current;

Park conversion-dq conversion;

LPF-low pass filter;

Kp-real component;

Kq-idle component;

Ka, Kb, Kc-current coefficient;

Function control mode:

Independent idle control-SVG:Kp=0, Ka=0, Kb=0, Kc=0, Kq=1;

Harmonic wave control-APF:Kp=1 separately, Ka=1, Kb=1, Kc=1, Kq=1;

Comprehensive Control SVG+APF-Kp=1, Ka=1, Kb=1, Kc=1, Kq=0.

5) by can calculate sensed current i according to formula (6) _a, i _b, i _cin first-harmonic real component i _apf, i _bpf, i _cpf

$\left[\begin{array}{c}{i}_{\mathrm{apf}}\\ i_{\mathrm{bpf}}\\ i_{\mathrm{cpf}}\end{array}\right]=C_{2/3}{C}_{\mathrm{pq}}^{-1}\left[\begin{array}{c}\stackrel{\‾}{p}\\ 0\end{array}\right]---\left(6\right)$

Sensed current i _a, i _b, i _cbe harmonic current and reactive current sum with the difference of fundamental active current.

The utlity model has following advantage:

1, same device, under system control, can realize respectively the function of SVG (static reacance generator) or APF (Active Power Filter-APF), also can realize SVG and APF function simultaneously, the design takes into account the functional requirement of SVG or APF simultaneously from hardware and software.The multiple power quality problems such as the harmonic wave that simultaneously changes in automatic tracking and compensating electrical network, idle, negative phase-sequence.SVG range of operation reaches-100%～+ 100%, and APF filter range is that 2～50 subharmonic filtering gamuts are effective, and free function setting;

2, power cell and direct current capacitor unit, for split-type structural designs, are easy to realize respectively dilatation;

3, adopt modularized design, power density is high, and volume is little, reduces and connects busbar length, and non-ferrous metal consumption is little;

4, adopt mean value carrier modulation technology, equipment itself does not produce humorous wave interference;

5, adopt the protective plate of degradable nonmetallic materials, realized the isolating and protecting of major loop and control system, i.e. dustproof, damp proof, anti-salt fog and antistatic.Meanwhile, ensure the smooth and easy and security of operation of ventilation and heat;

6, major loop and control system have adopted the design of secondary installing plate cellular construction to realize the worn-out isolation of screen, anti-electromagnetic interference;

7, built-in blower fan, can realize malleation low noise and ventilate and high efficiency and heat radiation;

8, rack is upper and lower, is all designed with inlet wire jockey, and realization can inlet wire compatibility entirely.

9, fast response time, the response time: SVG is less than 5ms, APF is less than 1ms;

10, back-up system automatic current limiting operation function.

Claims (4)

1. an active power quality comprehensive regulating device, is characterized in that, comprises cabinet, power cell, protective plate, breaker unit, secondary installing plate unit, DC capacitor unit, blower fan, reactor L1, reactor L2, filter capacitor, contactor,

Secondary installing plate unit supports fixing by secondary installing plate, secondary installing plate is made by sheet metal;

Cabinet top is provided with louver(-vre), and bottom is provided with ventilating blind, and the front of cabinet outside is provided with cabinet door, and cabinet upper rear portion and bottom are equipped with inlet wire plate;

In cabinet, be divided into four-layer structure, ground floor is provided with power cell, DC capacitor unit, blower fan, and power cell and DC capacitor unit are split-type structural, and it is positive near cabinet door place that power cell is arranged on cabinet, and DC capacitor bottom is provided with blower fan; The second layer is provided with reactor L2 and secondary installing plate unit, and secondary installing plate unit is arranged on power cell bottom; The 3rd layer is provided with reactor L1, filter capacitor; Bottom is provided with contactor and breaker unit, in described cabinet front cabinet door, is provided with protective plate, and power cell outside is provided with protective cover; Described protective plate and protective cover all adopt resin material to make.

2. a kind of active power quality comprehensive regulating device according to claim 1, is characterized in that, on the circuit board of described secondary installing plate unit, is coated with three anti-enamelled coatings.

3. a kind of active power quality comprehensive regulating device according to claim 1, is characterized in that, described outside, DC capacitor unit is provided with fin.

4. a kind of active power quality comprehensive regulating device according to claim 1, it is characterized in that, described power cell comprises IGBT module, drives keyset, radiator, IGBT module is connected with driving keyset, IGBT module is with driving keyset all by radiator heat-dissipation, and described radiator is made up of the heating panel of several dentalations.