CN202121330U

CN202121330U - Wind power energy storage system

Info

Publication number: CN202121330U
Application number: CN2011202239818U
Authority: CN
Inventors: 张文武; 张希凡; 段俊勇; 唐功友
Original assignee: Individual
Current assignee: Shenzhen City And Wei Wei Power Polytron Technologies Inc
Priority date: 2011-06-29
Filing date: 2011-06-29
Publication date: 2012-01-18
Anticipated expiration: 2021-06-29

Abstract

The utility model discloses a wind power energy storage system, which comprises a control module, a transformer module, a filtering module and an alternating current-direct current (AC-DC) transforming module. The transformer module comprises n transformer taps, one end of the transformer module is connected with an external alternating current power gird, and the other end of the transformer module is connected with one end of the filtering module through the transformer taps. The other end of the filtering module is connected with the transforming module, and the other end of the transforming module is connected with an energy storage module. The control module performs real-time detection of voltage of the energy storage module, sends selection instructions used for selecting the transformer taps to be connected with the filtering module to the transformer module, and further sends control instructions used for controlling a current transforming module to the transforming module. The wind power energy storage system has the advantages of saving energy, charging and discharging deeply, having no pollution to the power gird, being high in reliability and strong in controllability and the like.

Description

A kind of wind-electricity energy storage system

Technical field

The utility model relates to a kind of electric energy energy-storage system, specifically, relates to a kind of wind-electricity energy storage system.

Background technology

At present the most of electrical network of China is supplied power to the end user through existing transmission and distribution networks generally all based on large-scale centralized formula power station, this traditional mode electric power of can providing and delivering safely and reliably; But along with the increase of renewable energy power generation ratio demand, the essence of electrical network is also taking place to change, therefore; The problem that is now faced is; Along with the energy ratio that the wind-powered electricity generation place provides is growing, these wind energy turbine set are generally all away from the population collection district, and the power supply target is mainly the city electricity consumption and commercial power is supplied power; Therefore; Can obtain electric power from various forms of power plants in order to ensure this novel power grid, the firm power of providing and delivering as required needs to integrate administration of power networks comprehensively.

Based on this, how to invent a kind of wind-electricity energy storage system, can store the electric energy that wind-powered electricity generation produces, so that the whole network load of balance, realize being incorporated into the power networks smoothly of wind energy turbine set, be the problem that the utility model mainly solves.

Summary of the invention

The utility model is to existing energy-storage system, and a kind of wind-electricity energy storage system is provided, and can store electric energy more than needed very easily, and energy storage device can deep discharge, and reliability is high.

In order to solve the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:

A kind of wind-electricity energy storage system, the unsteady flow module that comprises control module, transformer module, filtration module and be used to connect the accumulation of energy module, said transformer module comprises N transformer tapping; Transformer module one end connects the external communication electrical network; An other end is connected with an end of filtration module through transformer tapping, and an other end of said filtration module connects the unsteady flow module, and said control module detects the voltage of accumulation of energy module in real time; Transmission is used to select the selection instruction of the transformer tapping that is connected with filtration module to transformer module; And send and to be used to control said current conversion control command to the unsteady flow module, wherein, n is the integer greater than 2.

In order to realize comparatively ideal harmonic suppression effect with less total inductance amount, described filtration module preferably adopts the LCL filter.

Further again, described unsteady flow module is the two-way unsteady flow module of AC-DC and DC-AC., the unsteady flow module receives the control command of controller, accomplishes different functions: during charging, select the work of AC-DC rectification pattern, thereby can the alternating current in the AC network be converted into direct current and storage; During discharge, control AC-DC inverter mode (being DC-AC) work, thus can convert the direct current of storing in the accumulation of energy module into alternating current, be released in the electrical network.

Further again, described control module is the wind-electricity energy storage net-connected controller, and described wind-electricity energy storage system also is included as the ups power that said battery accumulation of energy net-connected controller provides stable operating voltage.

Compared with prior art, advantage of the utility model and good effect are: the wind-electricity energy storage system of the utility model has following function and advantage:

(1) can realize multiple battery group (like ferric phosphate lithium cell, fuel cell, flow battery, lithium battery, super capacitor) is discharged and recharged;

(2) can realize multiple battery group (fuel cell, flow battery, the super capacitor etc.) degree of depth is discharged and recharged;

(3) have the characteristics of wind-powered electricity generation balance.Skewness or desultory wind-powered electricity generation are stored; Make generating electricity by way of merging two or more grid systems of regenerative resources such as wind-powered electricity generation more stable; Let " green " of cleaning along with in good time, an amount of output of variation of city electricity consumption actual demand,, improve the real value of light wind power generation with traditional electrical network good teamwork;

(4) has the electrical network miscellaneous function.Energy storage can the regulating and controlling electricity supply and demand imbalance, also be adapted to the cycle performance of energy storage technology simultaneously.Utilize electric energy storage technology, electrical production merchant can turn to energy like cost-efficient mode how from adjustment electric power output and generate electricity up;

(5) electric current of device feedback grid is approaching sinusoidal wave, and this device discharge is permanent power discharge, the capacity of ability device for accurately measuring dump energy.

After the detailed description in conjunction with advantages the utility model execution mode, other characteristics of the utility model and advantage will become clearer.

Description of drawings

Fig. 1 is the structured flowchart of a kind of embodiment of wind-electricity energy storage system of proposing of the utility model.

Embodiment

Below in conjunction with accompanying drawing the embodiment of the utility model is done explanation in further detail.

Embodiment one, referring to shown in Figure 1, and a kind of wind-electricity energy storage system of present embodiment; Comprise control module P1, transformer module P2, filtration module P3, unsteady flow module P4, described unsteady flow module P4 can realize AC-DC rectification pattern and DC-AC inverter mode (being AC-DC) bi-directional conversion, and said filtration module P3 is used for filtering and suppresses harmonic wave; Said transformer module P2 comprises n transformer tapping: U1, U1 ... Un; Wherein n is the integer greater than 2; The end of transformer module P2 connects the external communication electrical network, and an other end is connected with the end of filtration module P3 through transformer tapping Ux (x ∈ n), and the other end of said filtration module P3 is connected with unsteady flow module P4; The other end of said unsteady flow module P4 connects accumulation of energy module P5, is used for perhaps the dc inverter of P5 being networked to the P5 storage of electrical energy.This device comprises the charging and two processes of discharging; The Storage Unit that can not the degree of depth discharges and recharges for lithium iron battery etc.; According to accumulation of energy module P5 battery variety and connection in series-parallel electric pressure, select suitable transformer module tap, detect the voltage of accumulation of energy module P5 in real time through said control module P1; Control unsteady flow module P4 is operated in rectification pattern or inverter mode, can accomplish the battery accumulation of energy and the discharge of being incorporated into the power networks.Can be according to wind energy turbine set wind resource situation, when wind-force is big, implement accumulation of energy, when wind-force hour implements to be incorporated into the power networks discharge.Adopt the degree of depth when accumulation of energy and charge and discharge type cell (like fuel cell, super capacitor, flow battery etc.), system works need be divided three kinds of mode of operations: deep charge (the accumulation of energy module voltage is lower than the charging down of discharge minimum voltage), deep discharge (the accumulation of energy module voltage is lower than the discharge down of discharge minimum voltage) and rated operational voltage scope discharge and recharge.

As a concrete embodiment; It is 150DC that certain wind energy turbine set accumulation of energy module P5 adopts three single heap specifications; 400A (rated operational voltage 60-130VDC) flow battery series model adopts the autotransformer form, specifies the concrete implementation procedure of wind-electricity energy storage.The rated operational voltage of accumulation of energy module P5 is 180-390VDC (three single heap series connection).But flow battery discharges and recharges battery for the typical degree of depth, so this energy-storage system has three kinds of mode of operations: discharge and recharge under deep charge (the accumulation of energy module voltage is lower than the charging down of discharge minimum voltage), deep discharge (the accumulation of energy module voltage is lower than the discharge down of discharge minimum voltage) and the rated operational voltage.

According to the minimum rated voltage 180VDC of accumulation of energy module, calculate the degree of depth and discharge and recharge and normally discharge and recharge the pairing autotransformer tap position of threshold values 180VDC: U1=180/ (1.414*1.1)=116V.Can pass through the quick self discharge of electrolyte below the flow battery list heap 18VDC, so this accumulation of energy module self discharge voltage is 54VDC.Selective system deep discharge lower voltage limit is that 45VDC can meet the demands.Calculate corresponding autotransformer minimum output voltage tap position: U3=45/ (1.414*1.1)=29V.Requiring the reasonable multiple of output voltage according to the AC-DC current transformer is about 2.So between autotransformer output tap U1 and the U3 U2=58V tap (U1/U2=U2/U3=2) need be set also, therefore, autotransformer module P2 output has three taps: 116V, 58V, 29V.

First kind of mode of operation is the deep charge pattern: said control module P1 detects accumulation of energy module P5 voltage; Control transformer module P2 selects the U3 tap; Said control mould P1 control unsteady flow module P4 is with the work of rectification pattern, and battery module P5 charges to 90DC, and transformer module U2 tap output (breaking off the U3 tap) is selected in said control module P1 control; Battery module continues to charge to 180VDC, and precharge is accomplished.Second kind of mode of operation is that the range of nominal tension discharges and recharges: this mode is the groundwork mode of this system; Said control module P1 detects accumulation of energy module P5 voltage; Control transformer module P2 selects U1 tap (U2, U3 break off); Detect and control strategy according to wind energy turbine set wind-force, said control module P1 control unsteady flow module P4 is with rectification pattern or inverter mode work, and said control module is controlled the charging accumulation of energy of accumulation of energy module or the discharge of being incorporated into the power networks.Said control module P1 control charging/discharging voltage scope 180-390VDC, charge and discharge system can be selected constant current, constant voltage, permanent power etc.The third mode of operation is the deep discharge pattern: said control module P1 detects accumulation of energy module P5 voltage; Control transformer module P2 selects U2 tap (U1 disconnection); Said control mould P1 control unsteady flow module P4 is with inverter mode work, and battery module P5 is discharged to 90DC, and transformer module U1 tap output (breaking off the U2 tap) is selected in said control module P1 control; Battery module continues to be discharged to 45VDC, accomplishes deep discharge.

In order to realize comparatively ideal filtering and harmonic suppression effect with less total inductance amount, described filtration module P3 preferably adopts the LCL filter.

Described unsteady flow module is the two-way unsteady flow module of AC-DC and DC-AC., the unsteady flow module receives the control command of controller, accomplishes different functions: during charging, select the work of AC-DC rectification pattern, thereby can the alternating current in the AC network be converted into direct current and storage; During discharge, the work of control AC-DC inverter mode, thus can convert the direct current of storing in the accumulation of energy module into alternating current, be released in the electrical network.

Described control module P1 is a battery accumulation of energy net-connected controller, and described wind-powered electricity generation pond energy-storage system also is included as the ups power that said battery accumulation of energy net-connected controller provides stable operating voltage.

Described accumulation of energy module P5 is generally battery pack, such as, can adopt wherein a kind of such as fuel cell, flow battery, super capacitor.

The wind-electricity energy storage system of the utility model is applicable to the occasion of the dynamic energy storage of various needs; Can be through battery storage electric energy more than needed, and when electric energy is not enough, generate electricity by way of merging two or more grid systems after with the electric energy inversion, through a series of conversion; Form feedback grid with the standard power frequency sine wave; In microgrid, can play emergent independent reversion reaction, and this device have energy-conservation, the degree of depth discharges and recharges,, advantage such as reliability high, controllability strong pollution-free to electrical network, has wide practical prospect.

Certainly; Above-mentioned explanation is not to be the restriction to the utility model; The utility model also be not limited in above-mentioned for example, variation, remodeling, interpolation or replacement that those skilled in the art are made in the essential scope of the utility model also should belong to the protection range of the utility model.

Claims

1. A wind power energy storage system, characterized in that: comprising a control module, a transformer module, a filter module, and a converter module for connecting an external energy storage module, the transformer module includes n transformer taps, and one end of the transformer module is connected The other end of the external AC power grid is connected to one end of the filter module through a transformer tap, the other end of the filter module is connected to the converter module, the control module detects the voltage of the energy storage module in real time, and sends a signal for selecting the connection with the filter module A transformer tap selection command is sent to the transformer module, and a control command for controlling the current conversion module is sent to the current conversion module, wherein n is an integer greater than 2.

2. The wind power energy storage system according to claim 1, wherein the filter module is an LCL filter.

3. The wind power energy storage system according to claim 1 or 2, characterized in that: said converter module is an AC-DC and DC-AC bidirectional converter module.

4. The wind power energy storage system according to claim 3, wherein the control module is a battery energy storage grid-connected controller.

5. The wind power energy storage system according to claim 4, characterized in that it further comprises a UPS power supply that provides working voltage for the battery energy storage grid-connected controller.