CN202172301U - Topology connection structure of energy storage battery and aero-generator - Google Patents

Abstract

The utility model discloses a topology connection structure of an energy storage battery and an aero-generator, comprising a generator, an AC/DC (Alternating Current/Direct Current) current transformer, a DC/AC current transformer, the energy storage battery, a generator main controller, a controller and an energy storage system controller; wherein the generator, the AC/DC current transformer and the DC/AC current transformer are connected in order through DC buses, the energy storage battery is directly connected to a DC bus on which an AC/DC transformation is performed inside of the aero-generator; the generator main controller samples an output of the generator to obtain an original value, then a target value is obtained after a filtering is performed by a digital low pass filter, and a difference between the target value and the original value is a charge/discharge power of the energy storage battery; the generator main controller transmits the charge/discharge power of the energy storage battery to the controller; and the controller can control the AC/DC current transformer, the DC/AC current transformer and the energy storage battery through the energy storage system controller, thereby achieving the balance among an input power, the energy storage battery and an output power.

Description

The topological syndeton of a kind of energy-storage battery and aerogenerator

Technical field

The utility model relates to the topological syndeton of a kind of energy-storage battery and aerogenerator, belongs to the aerogenerator technical field.

Background technology

Along with the fast development of World Airways industry, power electronics new technology, new material, new equipment are applied in the civil aviation field more and more widely.Adopt big capacity, high efficiency, frequency range wide, can not reduce supplied character, electric power system that the quality of power supply is stable simultaneously, to improving civil aviaton's flight safety, promote industry steadily, coordinate sustainable development and play a part very important.

Improving constantly of the development of modern power electronics technology and aircraft automatization level makes computer and various advanced electric/electronic device to use aboard more and more.The power supply quality problem of the increase of aviation power supply capacity and conversion power supply system also will become increasingly conspicuous, and this is directly connected to the performance of advanced electric equipment function and the flight safety of aircraft.

In order to make the aerogenerator output voltage constant, aerogenerator often can not operate in best efficiency point, thereby satisfies the requirement of electric power system to voltage, and this causes the waste of power resource.In order to address this problem, can consider to utilize energy storage technology to cooperate exerting oneself of aerogenerator, through the control that discharges and recharges of energy-storage battery, it is little that the electric power system that makes aerogenerator and energy-storage battery form goes out fluctuation, satisfies quality of power supply requirement.This shows, energy storage technology with make generator may operate in higher operating efficiency point cooperating of aviation electricity generation system, thereby improve effective utilization to power resource.Therefore, the application of energy storage technology in the aviation electricity generation system has certain practical value.

Summary of the invention

The purpose of the utility model is in order to address the above problem, to propose the topological syndeton of a kind of energy-storage battery and aerogenerator.

The topological syndeton of a kind of energy-storage battery and aerogenerator comprises generator, AC/DC current transformer, DC/AC current transformer, energy-storage battery, generator main controller, controller and energy-storage system controller;

Generator, AC/DC current transformer, DC/AC current transformer connect through dc bus successively, and energy-storage battery directly is connected on the dc bus of the inner ac-dc conversion of aerogenerator; The generator main controller is sampled to the output of generator and is obtained original value, carry out filtering through wave digital lowpass filter after, obtain desired value, the difference of desired value and original value is the power that energy-storage battery discharges and recharges, if difference is being for just, energy-storage battery discharges; If negative, the energy-storage battery charging; The generator main controller is defeated by controller with the power that energy-storage battery discharges and recharges; Controller is controlled AC/DC current transformer, DC/AC current transformer, energy-storage battery through the energy-storage system controller; Difference power through continuous adjustment AC/DC current transformer and DC/AC current transformer is controlled discharging and recharging of energy-storage battery, reaches input power, energy-storage battery and power output three's balance.

The advantage of the utility model is:

(1) wiring is simple, alleviates cable and weight of equipment.The design directly utilizes AC/DC current transformer and DC/AC current transformer to control discharging and recharging of energy-storage battery, does not need the two-way PCS of extra DC/DC to come battery charging and discharging is controlled, and has reduced cost, has simplified design.Make weight saving simultaneously, reliability gets a promotion.

(2) efficient of raising electric power system.Owing to cooperate exerting oneself of generator to guarantee the stable of electric power system gross capability through energy-storage battery, thereby generator can be operated in best efficiency point, needn't waste electric energy through stable-pressure device simultaneously.Thereby under similar circumstances, the efficient of power supply is more increased.

Description of drawings

Fig. 1 is the structural scheme of mechanism of the utility model;

Fig. 2 is the low-pass first order filter amplitude-versus-frequency curve of the utility model.

Among the figure:

1-generator 2-AC/DC current transformer 3-DC/AC current transformer 4-energy-storage battery

5-generator main controller 6-controller 7-energy-storage system controller

Embodiment

To combine accompanying drawing and embodiment that the present invention is done further detailed description below.

The utility model is the topological syndeton of a kind of energy-storage battery and aerogenerator, and is as shown in Figure 1, comprises generator 1, AC/DC current transformer 2, DC/AC current transformer 3, energy-storage battery 4, generator main controller 5, controller 6 and energy-storage system controller 7.

Generator 1, AC/DC current transformer 2, DC/AC current transformer 3 connect through dc bus successively, and energy-storage battery 4 directly is connected on the dc bus of the inner ac-dc conversion of aerogenerator.

The output of 5 pairs of generators 1 of generator main controller is sampled and is obtained original value, carry out filtering through wave digital lowpass filter after, obtain desired value, the difference of desired value and original value is the power that energy-storage battery 4 discharges and recharges, if difference is being for just, energy-storage battery 4 discharges; If negative, energy-storage battery 4 chargings.The power that generator main controller 5 discharges and recharges energy-storage battery 4 is defeated by controller 6.Controller 6 is controlled through 7 pairs of AC/DC current transformers 2 of energy-storage system controller, DC/AC current transformer 3, energy-storage battery 4; Difference power through continuous adjustment AC/DC current transformer 2 and DC/AC current transformer 3 is controlled discharging and recharging of energy-storage battery 4, reaches input power, energy-storage battery and power output three's balance.

For the control strategy that discharges and recharges of energy-storage battery 4, target is to utilize it to discharge and recharge the amplitude that changes the electric power system power output, makes the electric energy that injects bus more steady.

For energy-storage battery 4 calculation of capacity methods; Through introducing the Mathematical Modeling of low-pass first order filter; Transfer function with low-pass first order filter is the basis, through iteration and mathematical reasoning, obtains the relation through active power value before and after the filter; After both differences were carried out time integral, the energy that obtains was exactly the required capacity of energy-storage battery 4.

At first, drive generator 1 generating through the aero-engine transmission.The active power of sending becomes direct current through the AC/DC current transformer, parallelly connected energy-storage battery 4 on dc bus.Energy-storage battery 4 output DCs are adjusted the voltage on the dc bus through discharging and recharging.The voltage that obtains after the adjustment becomes to exchange through DC/AC current transformer 3 to be exported, and the back connects the power supply bus rod.

Discharging and recharging of energy-storage battery 4 utilizes the power of AC/DC current transformer 2 and DC/AC current transformer 3 to control.Being provided with 6 pairs of generators 1 of controller and energy-storage battery 4 in the electric power system monitors respectively.

Concrete control method for energy-storage battery 4 is: the output of generator 1 is sampled obtains original value, carries out filtering through digital low-pass first order filter, obtains desired value.The difference of desired value and original value is the power of battery charging and discharging.If difference is being for just, battery discharge; If negative, battery charge.

The low pass filter model is incorporated in the battery capacity calculating.Consider the single order passive low ventilating filter.Its transfer function expression formula is following:

$\frac{Y\left(s\right)}{X\left(x\right)}=\frac{1}{1+\mathrm{\τs}}$

Turning to the time domain form is:

$\mathrm{\τ}\frac{\mathrm{dY}\left(t\right)}{\mathrm{dt}}+Y\left(t\right)=X\left(t\right)$

τY′+Y＝X

Promptly

X is an input variable in the formula, and Y is an output variable, and Y ' is the differential of Y, and τ is a time constant filter.Its amplitude-frequency characteristic is shown in accompanying drawing 2.

F among the figure _cBe the cut-off frequency of low pass filter, The passband of low pass filter is 0-f _c, f _c-∞ is a stopband.See that from amplitude-frequency characteristic to the input signal of same amplitude, frequency is high more, the output signal amplitude is more little; Along with cut-off frequency f _cReduce, i.e. the increase of time constant filter τ, output signal frequency is low more, steady more.When output of a generator was stabilized control, the X in the formula (4-2) was equivalent to P _w, Y is equivalent to P _OutFollowing formula is carried out discretization, and establishing t is control cycle, at t _k=kt (k=1,2,3 ..., n) constantly:

$\mathrm{\τ}\frac{Y_k-Y_{k-1}}{t}+Y_k=X_k$

Separate Y _k,

$Y_k=\frac{\mathrm{\τ}}{\mathrm{\τ}+t}{Y}_{k-1}+\frac{\mathrm{\τ}}{\mathrm{\τ}+t}{X}_k$

If λ=t/ (τ+t) (0＜λ＜1):

Y _k＝(1-λ)Y _k-1+λX _k

Can find out known t _kP constantly _wValue X _k, previous moment P _OutValue Y _K-1With the λ value, just can obtain the P after stabilizing control _OutValue Y _k

Known X _kAnd Y _k, so the power that sucks of energy-storage system as shown in the formula:

P _b＝X _k-Y _k

Before output of a generator carried out energy storage and stabilize control, set τ value and P _OutInitial value Y ₀, after the process of stabilizing finishes, can obtain n P _bValue, and this group P _bValue is calculated the foundation of energy-storage battery capacity just.

Stabilize in the process energy in the energy-storage system and use E _kExpression

E in the formula ₀For the primary power in the energy-storage system, establish E0=0, from k=1 to k=n, calculate E _kThe capacity of energy-storage battery is represented as follows with W:

$W=\underset{k=1....n}{\max }{E}_k-\underset{k=1....n}{\min }{E}_k$

Stabilize in the process in actual energy storage because the energy in the energy-storage system can not be for negative, therefore if

So actual E ₀Should equal

Along with the increase of τ value, promptly the λ value reduces, Y in addition ₀Value produce certain influence to stabilizing the required stored energy capacitance of generator power fluctuation, do labor in the face of this down:

Method representation Y with iteration _k,

Visible by following formula, the λ value is more little, Y _kWith Y ₀Approaching more; The λ value is big more, Y _kWith X _kApproaching more.When λ → 0, stabilizing output approximate is that power is Y ₀Straight line.

Suppose the output of a generator of T in the period stabilized, establish T=nt, the energy of generator output is used W _fExpression,

Stabilize the energy that injects bus rod in the back through energy storage and represent with Wg,

$W_g={\mathrm{\Σ}}_{k=1}^n{Y}_k\·t=\stackrel{\‾}{Y}\·T$

Suppose that energy storage stabilizes process and do not have energy consumption, the energy that energy-storage battery need be stored is Ws, according to law of conservation of energy,

$W_g=W_f-W_g=(\stackrel{\‾}{X}-\stackrel{\‾}{Y})\·T$

Claims (1)

1. the topological syndeton of energy-storage battery and aerogenerator is characterized in that, comprises generator, AC/DC current transformer, DC/AC current transformer, energy-storage battery, generator main controller, controller and energy-storage system controller;

Generator, AC/DC current transformer, DC/AC current transformer connect through dc bus successively, and energy-storage battery directly is connected on the dc bus of the inner ac-dc conversion of aerogenerator; The generator main controller is sampled to the output of generator and is obtained original value, carry out filtering through wave digital lowpass filter after, obtain desired value, the difference of desired value and original value is the power that energy-storage battery discharges and recharges, if difference is being for just, energy-storage battery discharges; If negative, the energy-storage battery charging; The generator main controller is defeated by controller with the power that energy-storage battery discharges and recharges; Controller is controlled AC/DC current transformer, DC/AC current transformer, energy-storage battery through the energy-storage system controller; Difference power through continuous adjustment AC/DC current transformer and DC/AC current transformer is controlled discharging and recharging of energy-storage battery, reaches input power, energy-storage battery and power output three's balance.