CN202268705U - Wind power station power grid voltage disturbance simulation generator - Google Patents

Abstract

The utility model relates to a wind power grid voltage disturbance simulation generating device, which is composed of A, B and C three-phase single devices which are completely independent and have the same structure; when the single device of each phase is working, it first passes through the transformer T1 to step down the voltage , and then rectified by at least one AC/DC rectifier, the DC capacitors C1, C2 until Cn act as a DC voltage support, and then invert by at least one DC/AC inverter. The tail end of the first DC/AC inverter is connected to the head end of the second DC/AC inverter, and so on. After the series connection, there is a head end A and a tail end Na; the head end A passes through the transformer T2 is boosted to the voltage level of the test bus and connected to the test bus. The device provided by the utility model simulates and realizes the occurrence of grid voltage disturbance at the grid-connected voltage level of wind power, realizes the bidirectional flow of energy, and satisfies the operation requirements of the wind turbine in the motoring and generating states.

Description

A kind of wind energy turbine set line voltage disturbance simulation generating means

Technical field

The utility model relates to a kind of device of wind-electricity integration technical field, is specifically related to a kind of wind energy turbine set line voltage disturbance simulation generating means.

Background technology

Wind-powered electricity generation has the characteristic that is difficult to dispatch as a kind of fluctuation power supply, and large-scale wind power is incorporated into the power networks, and operation produces bigger influence to power system safety and stability.When electrical network takes place like disturbances such as voltage fluctuation, frequency fluctuation, voltage distortion and imbalance of three-phase voltage; The large-scale wind power field of being incorporated into the power networks must possess good electrical network adaptive capacity, comprising active power adjusting, reactive power adjusting, frequency adjustment and antijamming capability etc.

At present, along with electrical network is inserted in the large-scale wind power field, received extensive concern for the requirement of wind energy turbine set low voltage ride-through capability.China tentatively possesses the test detectability aspect low voltage ride-through capability, but also lacks the corresponding techniques means for the various disturbances whether the wind-powered electricity generation unit can tolerate line voltage.Also carrying out correlative study aspect the controllable voltage quality disturbing generating device both at home and abroad, but also do not reporting about the research of wind energy turbine set line voltage simulation generating means.

In addition, the characteristic of wind energy turbine set has determined that the power of disturbing generating device must be the four quadrant running mode, and when test wind-powered electricity generation machine unit characteristic, must not influence original electric power system.Therefore; The voltage disturbance generating means of research only is used in the electric power system that is lower than wind energy turbine set line voltage grade at present; System is incorporated into or the equipment that seals in such as the detection or the experimental study of idle harmonic compensation arrangement and typical load, can not satisfy the requirement that wind-electricity integration technology and wind-powered electricity generation unit are tested detection technique research.

The utility model content

The purpose of the utility model provides a kind of wind energy turbine set line voltage disturbance simulation generating means; This device is based on the total power four quadrant convertor; Simulation realizes that the line voltage disturbance under the wind-electricity integration electric pressure takes place; Realize the two-way flow of energy, satisfy the wind-powered electricity generation unit in electronic and service requirement generating state.

The utility model adopts following proposal to implement:

A kind of wind energy turbine set line voltage disturbance simulation generating means, its improvements be, said device is made up of complete independence and identical in structure A, B, C three-phase single assembly; Said every phase single assembly comprises transformer T1, AC/DC rectifier, direct current capacitor C1-Cn, DC/AC inverter and transformer T2;

Said every when working mutually earlier through transformer T1 step-down; Pass through at least one AC/DC rectifier rectification then, direct current capacitor C1, C2 play the direct voltage supporting role up to Cn, pass through at least one DC/AC inverter inversion again; Carry out the head and the tail serial connection after the inversion output; Said head and the tail serial connection is the head end of second DC/AC inverter of tail end connection of first DC/AC inverter, and the like, be connected in series surplus next head end A in back and tail end Na; Said head end A boosts to the electric pressure of test bus again through said transformer T2, be connected to the test bus.

Compared with prior art, the beneficial effect that reaches of the utility model is:

1) circuit topological structure that provides of the utility model is simple, can realize modularized design, improves the reliability of device, makes things convenient for the O&M of device;

2) rating of set that provides of the utility model can be realized two-way flow, satisfies the demand that is incorporated into the power networks of wind-powered electricity generation unit;

3) blower fan side (test bus) is isolated with grid side (generating bus) fully, and the fault of blower fan side can not have influence on the normal operation of grid side;

4) device that provides of the utility model can be according to the load capacity size, the access of flexible configuration main circuit power part;

5) apparatus function that provides of the utility model is powerful, can realize frequency fluctuation, voltage fluctuation, voltage distortion and three-phase imbalance and the simultaneous function of multiple disturbance.

Description of drawings

Fig. 1 is the topology diagram of wind energy turbine set line voltage disturbance simulation generating means.

Fig. 2 is scope range of the fluctuation of voltage-1%～+ 1%, the oscillogram of vibration frequency 10Hz;

Fig. 3 is scope range of the fluctuation of voltage-4%～+ 4%, the oscillogram of vibration frequency 3Hz;

Fig. 4 is amplitude 5%, 25 subharmonic disturbance waveform figure;

Fig. 5 is amplitude 10%, 5 subharmonic disturbance waveform figure.

Embodiment

Below in conjunction with accompanying drawing the embodiment of the utility model is done further detailed description.

The device that the utility model provides is based on the total power four quadrant convertor, wind energy turbine set line voltage disturbing generating device topological structure (A phase sketch map) as shown in Figure 1.Its operation principle is following: wind energy turbine set line voltage disturbance simulation generating means is serially connected between 35KV generating bus (electrical network) and the 35KV test bus (blower fan); Earlier through transformer T1 step-down; Pass through a plurality of AC/DC rectifier rectifications then, direct current capacitor C1, C2 play the direct voltage supporting role up to Cn, pass through the inversion of a plurality of DC/AC inverter again; Carry out the head and the tail serial connection after the inversion output; Be the head end of second DC/AC inverter of tail end connection of first DC/AC inverter, and the like, be connected in series surplus next head end A in back and tail end Na; Head end A boosts to the electric pressure of test bus again through transformer T2, receive the test bus.Through suitable control, line voltage disturbance simulation generating means can send the required various disturbance waveform of upset test, and typical waveform figure is like Fig. 2,3, shown in 4 and 5.

Fig. 2 is scope range of the fluctuation of voltage-1%～+ 1%, the oscillogram of vibration frequency 10Hz.Upper part shown in the figure is the effective value of 35KV grid side phase voltage; Lower part is a disturbance simulation generating means voltage fluctuation test output voltage effective value among the figure, i.e. 35KV blower fan side phase voltage effective value, and its scope range of the fluctuation of voltage is-1%～+ 1%, vibration frequency is 10Hz.

Fig. 3 is scope range of the fluctuation of voltage-4%～+ 4%, the oscillogram of vibration frequency 3Hz.Upper part shown in the figure is the effective value of 35KV grid side phase voltage; Lower part is a disturbance simulation generating means voltage fluctuation test output voltage effective value among the figure, i.e. 35KV blower fan side phase voltage effective value, and its scope range of the fluctuation of voltage is-4%～+ 4%, vibration frequency is 3Hz.

Fig. 4 is amplitude 5%, 25 subharmonic disturbance waveform figure.Be disturbance simulation generating means voltage distortion test output A, B, C three-phase voltage shown in the figure, promptly the 35KV electrical network through disturbance device output after, voltage has superposeed, and amplitude is 5%, frequency is the harmonic voltage of 25 times of power frequencies.

Fig. 5 is amplitude 10%, 5 subharmonic disturbance waveform figure.Be disturbance simulation generating means voltage distortion test output A, B, C three-phase voltage shown in the figure, promptly the 35KV electrical network through disturbance device output after, voltage has superposeed, and amplitude is 10%, frequency is the harmonic voltage of 5 times of power frequencies.

Should be noted that at last: combine the foregoing description only explain the utility model technical scheme but not to its restriction.Under the those of ordinary skill in field be to be understood that: those skilled in the art can make amendment or are equal to replacement the embodiment of the utility model, but these modifications or change are all among the claim protection range that application is awaited the reply.

Claims (1)

1. wind energy turbine set line voltage disturbance simulation generating means is characterized in that, said device is made up of complete independence and identical in structure A, B, C three-phase single assembly; Said every phase single assembly comprises transformer T1, AC/DC rectifier, direct current capacitor C1-Cn, DC/AC inverter and transformer T2;

Said every when working mutually earlier through transformer T1 step-down; Pass through at least one AC/DC rectifier rectification then, direct current capacitor C1, C2 play the direct voltage supporting role up to Cn, pass through at least one DC/AC inverter inversion again; Carry out the head and the tail serial connection after the inversion output; Said head and the tail serial connection is the head end of second DC/AC inverter of tail end connection of first DC/AC inverter, and the like, be connected in series surplus next head end A in back and tail end Na; Said head end A boosts to the electric pressure of test bus again through said transformer T2, be connected to the test bus.

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