CN204361950U

CN204361950U - The simple and easy power converter topologies of partly encouraging oneself of switching magnetic-resistance wind-driven generator

Info

Publication number: CN204361950U
Application number: CN201420869453.3U
Authority: CN
Inventors: 孙冠群
Original assignee: China Jiliang University
Current assignee: China Jiliang University
Priority date: 2014-12-30
Filing date: 2014-12-30
Publication date: 2015-05-27
Anticipated expiration: 2024-12-30

Abstract

The simple and easy power converter topologies of partly encouraging oneself of switching magnetic-resistance wind-driven generator, is made up of asymmetrical half-bridge formula power transforming main circuit, storage battery, capacitor, DC/DC converter, load; Described asymmetrical half-bridge formula power transforming main circuit is connected in parallel with the described storage battery of connecting and described capacitor, output and the storage battery of described DC/DC converter are connected in parallel, the series arm of the another two ends of DC/DC converter and storage battery and capacitor is connected in parallel, and is also connected in parallel with described load simultaneously; This topological structure is simple and practical, overcomes existing shortcoming, is suitable for the switching magnetic-resistance wind-driven generator power inverter field of middle low power grade.

Description

The simple and easy power converter topologies of partly encouraging oneself of switching magnetic-resistance wind-driven generator

Technical field

The present invention relates to switched reluctance machines and control field thereof, be specifically related to a kind of topological structure of power inverter novel excitation mode of switching magnetic-resistance wind-driven generator.

Background technology

Clean, green, that environmental protection is mark wind power generation is the renewable energy power generation form given priority to both at home and abroad so far for many years; But make a general survey of Europe, North America and China, the realistic problem that cost is high is the key factor affecting Wind Power Development always, except grid type, microgrid or independent wind power system too, to reducing costs, simplified structure, reduction volume weight, have become the developing direction common recognition that industry is important.

Switch reluctance generator structure is simple, brushless on rotor, without winding, without permanent magnet; It is equivalent to a current source when running, and like this in certain range of speeds, output end voltage can not change along with the change of rotating speed, and this is very suitable for the wind energy conversion system of the variable-speed operation of current main-stream, can improve the utilization ratio of wind energy; Switch reluctance generator low speed controllability is good, thus can save gear box under wind-force Direct driver, and make whole power generation system structure more succinct, reliable while realizing higher generating efficiency, this is also the development trend of wind generator system; And in running, switch reluctance generator controllable parameter is many, as switching angle control, Current cut control, PWM control, the control strategy of more complicated can be realized easily, control output dc voltage and electric current flexibly; Therefore, switch reluctance generator introduces wind power generation field, get final product the conversion that high efficiency realizes wind energy, the simplicity of structure means the maintenance that higher reliability is less and lower installation cost and equipment purchase cost, the power inverter that switch reluctance generator used for wind power generation is relevant also should as designs direction, namely structure is simple as far as possible, keeps its advantage controlled flexibly simultaneously.

About the power inverter main circuit of switch reluctance generator, asymmetrical half-bridge formula is comparative maturity, under coordinating certain control model, can timesharing, different circuit conveniently realize excitation and generating; About excitation mode, generally there are separate excitation and self-excitation two kinds, separate excitation mode is unlike the pulsation having larger voltage and current during self-excitation mode, stability is better, but shortcoming can produce very large impulse current when initial start, this is because the capacitor of output parallel connection does not have in the starting stage effect that namely any energy storage does not have voltage support, thus produce very large electric current in the short time after impact direct voltage.

Although separate excitation mode generally needs reserve battery, if storage battery is as field power supply, but self-excitation mode generally also needs reserve battery, just both differences are, the battery supply of self-excitation mode uses when switching magnetic-resistance electricity generation system initial start, after this do not re-use in running, and separate excitation mode uses always, obviously not complicated in structure, so, make full use of the advantage of separate excitation and self-excitation mode, overcome their shortcoming simultaneously, the succinct power converter topologies of project organization is highly significant.

Summary of the invention

According to above background technology, the utility model proposes a kind of separate excitation mode that neither belongs to and also do not belong to self-excitation mode and the switching magnetic-resistance wind-driven generator power converter topologies new construction being called half self-excitation mode, structure is simple, also overcome separate excitation mode initial current to a certain extent and impact large and self-excitation mode affects field performance shortcoming because output current fluctuation is large, can be used for middle-size and small-size Switched Reluctance Generator for Wind Power System field.

The technical solution of the utility model is:

The simple and easy power converter topologies of partly encouraging oneself of switching magnetic-resistance wind-driven generator, be made up of asymmetrical half-bridge formula power transforming main circuit 1, storage battery X, capacitor Cd, DC/DC converter 2, load R, it is characterized in that, described asymmetrical half-bridge formula power transforming main circuit 1 is connected in parallel with the described storage battery X connected and described capacitor Cd, output and the storage battery X of described DC/DC converter 2 are connected in parallel, the series arm of the another two ends of DC/DC converter 2 and storage battery X and capacitor Cd is connected in parallel, and is also connected in parallel with described load R simultaneously.

The rated voltage of described storage battery X is less than the rated output voltage of asymmetrical half-bridge formula power transforming main circuit 1, storage battery X, as the field power supply of switch reluctance generator stator winding A/B/C, takes from by DC/DC converter 2 electric energy that generator sends when short of electricity and to its charging.

Major technique effect of the present utility model is:

The simple and easy power converter topologies of partly encouraging oneself of switching magnetic-resistance wind-driven generator of the present utility model, storage battery X serves separate excitation excitation function, meanwhile, because of the electric energy that electric energy during its short of electricity produces from oneself, also there is the feature of self-excitation, so be called half self-excitation or half separate excitation excitation mode, only a set of storage battery X can complete excitation and powers, and compared with independent separate excitation or self-excitation pattern, does not increase hardware, simultaneously, be parallel to again to generate electricity after this storage battery X connects with capacitor Cd and export two ends, capacitor Cd plays voltage stabilizing and filter action when stable operation, but when system initial start, Yin Qishang does not have energy storage, pressure stabilization function can not be played, if capacitor Cd simple under traditional separate excitation pattern is parallel to generating output, export on bus and capacitor Cd branch road and will produce very large immediate current, increase the weight of the burden of electric component in capacitor Cd and power inverter associated loop, and the utility model, adopt the structure that charged storage battery X first connects with capacitor Cd, namely in initial start moment, there is certain voltage in capacitor Cd branch road, then inhibited to rush of current, meanwhile, because storage battery power supply is stablized, when it also avoid self-excitation pattern, exciting current is pulsed large shortcoming.

So above design feature, makes topological structure of the present utility model greatly inhibit the respective major defect of simple separate excitation and self-excitation pattern.

Although add DC/DC converter 2, seemingly structure complicates, in fact, in the control system of switch reluctance generator, the DC power supply of multiple different DC voltage level must be needed, so, in reality, completely can choosing according to design load, effectively utilize existing DC/DC converter in system.

Accompanying drawing explanation

Figure 1 shows that the simple and easy half self-excitation power converter topologies circuit structure diagram of switching magnetic-resistance wind-driven generator of the present utility model.

Embodiment

As shown in Figure 1, in asymmetrical half-bridge formula power transforming main circuit 1, A/B/C is the threephase stator winding of switch reluctance generator, and three-phase windings is independent loop, independent control separately; According to the rotor position information of switch reluctance generator feedback, when certain phase winding needs excitation to be energized, electronic power switch pipe V1 and the V2 of this phase winding energized circuit of corresponding control, or V3 and V4, or V5 and V6 receives the drive singal conducting from switch reluctance generator controller, enters current excitation at the flows by action of storage battery X; When excitation terminates, corresponding electronic power switch pipe turns off immediately, now because the winding just by electricity is perception and stores magnetic energy, its magnetic energy stored will flow through Power Diode Pumped D1 and D2, or D3 and D4, or the loop of D5 and D6, thus export to external loading R and other energy-storage travelling wave tubes; These six electronic power switch pipes of V1-V6, middle-size and small-size switching magnetic-resistance electricity generation system adopts IGBT to be good.

Under traditional excitation mode, no matter encourage oneself or separate excitation pattern, the asymmetrical half-bridge formula power transforming main circuit 1 of switching magnetic-resistance electricity generation system output and accompanying drawing 1 exports a two ends often independent capacitor in parallel, the mode of upper exciting storage battery X and the utility model is taked to connect with capacitor Cd again, and then and output-parallel, when storage battery X electric energy is not enough, by DC/DC converter 2 to its charging; Storage battery X is according to the needs of voltage, power match, batteries is should be in reality, but, its rated voltage should be significantly less than generator output rated voltage, load R both end voltage value when being namely significantly less than specified, needs that specifically should control according to whole electricity generation system load and maximal power tracing and determine specified ratio and corresponding concrete rated value.

Although the three-phase windings switch reluctance generator that the present embodiment adopts, do not affect the protection of the utility model to other different number of phases situations.

Claims

1. the simple and easy power converter topologies of partly encouraging oneself of switching magnetic-resistance wind-driven generator, be made up of asymmetrical half-bridge formula power transforming main circuit, storage battery, capacitor, DC/DC converter, load, it is characterized in that, described asymmetrical half-bridge formula power transforming main circuit is connected in parallel with the described storage battery of connecting and described capacitor, output and the storage battery of described DC/DC converter are connected in parallel, the series arm of the another two ends of DC/DC converter and storage battery and capacitor is connected in parallel, and is also connected in parallel with described load simultaneously.

2. the simple and easy power converter topologies of partly encouraging oneself of switching magnetic-resistance wind-driven generator according to claim 1, it is characterized in that, the rated voltage of described storage battery is less than the rated output voltage of asymmetrical half-bridge formula power transforming main circuit, storage battery, as the field power supply of switch reluctance generator stator winding, takes from by DC/DC converter electric energy that generator sends when short of electricity and to its charging.