CN203037767U

CN203037767U - Low voltage crossing testing device

Info

Publication number: CN203037767U
Application number: CN 201220717781
Authority: CN
Inventors: 李超锋; 吴让慧; 李磊; 宫玉鹏; 于阳
Original assignee: Sinovel Wind Group Co Ltd
Current assignee: Sinovel Wind Group Co Ltd
Priority date: 2012-12-21
Filing date: 2012-12-21
Publication date: 2013-07-03
Anticipated expiration: 2022-12-21

Abstract

The utility model provides a low voltage crossing testing device which is connected in series between a power grid and a fan to be tested. The low voltage crossing testing device comprises a first reactor which is connected in series between the power grid and the fan to be tested, a second circuit breaker which is connected in parallel with the first reactor, a grounding line, a second reactor which is connected in series with the grounding line, a third circuit breaker which is connected in series with the grounding line, a PLC module which controls on and off of the second circuit breaker and the third circuit breaker, wherein one end of the grounding line is led out between the first reactor and the fan to be tested, and the other end of the grounding line is connected with the ground. According to the technical scheme of the utility model, the low voltage crossing testing device which is connected in series between the power grid and the fan is used, and is dedicated to low voltage crossing testing; and by arranging the two reactors, reactance proportion is changed and dropping of different amplitudes is realized, thus low voltage testing can be conveniently carried out.

Description

Low-voltage is passed through testing apparatus

Technical field

The utility model relates to wind power generation field, passes through testing apparatus in particular to a kind of low-voltage.

Background technology

In recent years, along with wind generating technology constantly improves, the wind energy turbine set installed capacity is risen year by year, and is very high in the shared mains supply ratio of some American-European countries's wind-power electricity generations, and for example Denmark surpasses 20%.Wind-power electricity generation can alleviate air pollution and water pollutes, can not impact weather, but when electrical network breaks down when causing voltage to fall, if the numerous and confused off-the-line off-grid of wind-powered electricity generation unit, will cause network system transient state instability, can cause the local even paralysis comprehensively of system when serious, cause power grid accident.

Be to guarantee the normal operation of network system, international, domesticly formulated the low voltage ride-through capability that relevant regulation and standard are checked the wind-powered electricity generation unit respectively.The low voltage ride-through capability of wind turbine generator system standard of China's foundation mainly is GB-T19963-2011 and IEC61400-21-2008.As shown in Figure 1, in the standard meritorious recovery and the idle support of the falling type, fall the degree of depth of line voltage, drop-out time and wind-powered electricity generation unit are stipulated.Therefore, before the wind-powered electricity generation unit dispatches from the factory, all need it is carried out the test of low voltage ride-through capability.

At present, lack special-purpose low-voltage in the prior art and pass through testing apparatus, there is unhandy problem in existing equipment when carrying out the low voltage ride-through capability testing experiment.

The utility model content

The utility model aims to provide a kind of low-voltage and passes through testing apparatus, lacks specialized equipment, unhandy problem to solve in the prior art.

To achieve these goals, according to an aspect of the present utility model, provide a kind of low-voltage to pass through testing apparatus, be connected between electrical network and the blower fan to be measured, having comprised: first reactor is connected between electrical network and the blower fan to be measured; Second isolating switch, in parallel with first reactor; Ground path, an end is drawn between first reactor and blower fan to be measured, other end ground connection; Second reactor is connected in the ground path; The 3rd isolating switch is connected in the ground path; The PLC module is controlled the break-make of second isolating switch and the 3rd isolating switch.

Further, wherein, first reactor and second reactor are the reactor of adjustable amplitude value, the amplitude of PLC module controls first reactor and second reactor.

Further, first reactor and second reactor are a plurality of single reactor series connection, each single reactor parallel IGBT module, the break-make of PLC module controls IGBT module.

Further, first reactor and second reactor comprise a plurality of reactor groups, and each reactor group is a plurality of single reactor series connection, each single reactor parallel IGBT module, the break-make of PLC module controls IGBT module.

Further, also comprise, the 4th isolating switch and the 5th isolating switch in parallel, the two is connected in the ground path jointly.

Further, comprise also that transformer is connected between electrical network and the blower fan to be measured.

Use the technical solution of the utility model, the low-voltage that employing is connected between electrical network and the blower fan is passed through testing apparatus, is exclusively used in low-voltage and passes through test, by two reactors are set, change the reactance proportioning and realize falling of different amplitudes, thereby carry out low voltage test easily.

Description of drawings

The Figure of description that constitutes the application's a part is used to provide further understanding of the present utility model, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not constitute improper restriction of the present utility model.In the accompanying drawings:

Fig. 1 shows existing technical standard to the curve requirement of the low voltage ride-through capability of wind-powered electricity generation unit;

Fig. 2 shows the wiring diagram that low-voltage of the present utility model is passed through testing apparatus;

Fig. 3 shows the synoptic diagram that low-voltage of the present utility model is passed through the single reactor in the testing apparatus;

Fig. 4 shows the synoptic diagram that low-voltage of the present utility model is passed through the reactor group in the testing apparatus; And

Fig. 5 shows the use process flow diagram that low-voltage of the present utility model is passed through testing apparatus.

Embodiment

Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the utility model below with reference to the accompanying drawings and in conjunction with the embodiments in detail.

The utility model provides a kind of wind-powered electricity generation unit low-voltage to pass through testing apparatus, this devices in series is between electrical network and blower fan to be measured, by artificial simulation electrical network three-phase, two-phase short-circuit fault, change the reactor proportioning and then change voltage and fall amplitude, wind-powered electricity generation unit to be measured is tested.

For satisfying above-mentioned requirements, the utility model adopts following technical proposals to realize:

Intensive design is adopted in global design, and equipment is integrated within two TEU (Twenty-foot Equivalent Unit)s, is convenient to transition transportation and lifting.

Equipment main wiring diagram of the present utility model as shown in Figure 2, the series connection first isolating switch CB1 and the first reactor Xn between electrical network GRID and wind-powered electricity generation unit WT, the second isolating switch CB2 is in parallel with the first reactor Xn, and by drawing a ground wire in the circuit between the first reactor Xn and the wind-powered electricity generation unit WT.This is connected wires and goes up the 3rd isolating switch CB3 that connects in proper order, the second reactor Xk, the 4th isolating switch CB4 that is connected in parallel and the 5th isolating switch CB5, the 6th isolating switch CB6.The voltage of different depth falls by changing the proportioning of reactor, namely realizes by the resistance of regulating the first reactor Xn and the second reactor Xk; The change of short circuit mode realizes by the disconnection closed procedure to isolating switch CB4 and CB5.Preferably, in the line can also series transformer.

As shown in Figure 3, the reactor of each phase in the equipment is connected in series respectively, and each reactor itself contains four joints, and reactor is divided into three sections, one group of IGBT module of each section parallel connection.

As shown in Figure 4, at first section connection of the reactor electrical network GRID of series connection side cable, tail end connects short circuit cable SC, and upright between per two reactors have one to connect copper bar A, in order to be connected to wind-powered electricity generation unit cable.

The amplitude that voltage falls, time and the mode of falling all arrange at the Long-distance Control interface, after setting is finished, send to equipment PLC module, PLC sends control signal, by the closed ratio that changes Xn and Xk of the disconnection of the control IGBT module in parallel with reactor, fall amplitude thereby change voltage; By the selection to isolating switch CB4 and CB5 operation realization failure mode; By the closed selection that realizes fault-time of the disconnection of CB3 and CB2.(generally speaking, isolating switch CB1 and CB6 are in normally off.）

Referring to shown in Figure 5, use process flow diagram of the present utility model is as follows:

1, fall mode (falling or three-phase falls as two-phase), drop-out time and fall amplitude in the Long-distance Control layout setting, arrange finish after hit testing, send a signal to PLC.

2, PLC obtains after the signal, and according to the amplitude of selecting of falling, the IGBT module conducting of control reactor parallel connection is turn-offed, and changes the ratio of Xn and Xk, thereby reaches the amplitude of falling of hope; Control isolating switch CB4 and CB5, the short circuit mode that obtains expecting.

3, PLC control disconnects the second isolating switch CB2, and closed the 3rd isolating switch CB3 falls voltage,

4, by programmed control reach fall the duration after, cut-off breaker CB3, close circuit breaker CB2 falls and finishes.

As can be seen from the above description, the utility model has been realized following technique effect:.

The movable-type intelligent low-voltage that the utility model provides is passed through testing apparatus and is adopted intensive design, is convenient to transportation; Realize falling of different amplitudes by changing the reactance proportioning; Simulation electrical network three-phase, two-phase short-circuit fault; Fall and be arranged on remote interface setting, safety, accurate, quick.

The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims

1. a low-voltage is passed through testing apparatus, it is characterized in that, is connected between electrical network and the blower fan to be measured, comprising:

First reactor (Xn) is connected between described electrical network (GRID) and the blower fan to be measured (WT);

Second isolating switch (CB2), in parallel with described first reactor (Xn);

Ground path, an end is drawn other end ground connection between described first reactor (Xn) and described blower fan to be measured (WT);

Second reactor (Xk) is connected in the described ground path;

The 3rd isolating switch (CB3) is connected in the described ground path;

The PLC module is controlled the break-make of described second isolating switch (CB2) and the 3rd isolating switch (CB3).

2. low-voltage according to claim 1 is passed through testing apparatus, it is characterized in that, wherein, described first reactor (Xn) and described second reactor (Xk) are the reactor of adjustable amplitude value, the amplitude of described first reactor of described PLC module controls (Xn) and described second reactor (Xk).

3. low-voltage according to claim 2 is passed through testing apparatus, it is characterized in that, described first reactor (Xn) and described second reactor (Xk) are a plurality of single reactor series connection, each described single reactor (Xn) parallel IGBT module, the break-make of the described IGBT module of described PLC module controls.

4. low-voltage according to claim 2 is passed through testing apparatus, it is characterized in that, described first reactor (Xn) and described second reactor (Xk) comprise a plurality of reactor groups, each described reactor group is a plurality of single reactor series connection, each described single reactor parallel IGBT module, the break-make of the described IGBT module of described PLC module controls.

5. low-voltage according to claim 1 is passed through testing apparatus, it is characterized in that, also comprise, and the 4th isolating switch (CB4) and the 5th isolating switch (CB5) in parallel, the two is connected in the described ground path jointly.

6. low-voltage according to claim 1 is passed through testing apparatus, it is characterized in that, comprises that also transformer is connected between described electrical network (GRID) and the blower fan to be measured (WT).