CN207117292U - A kind of refrigerator voltage compensation system - Google Patents

Abstract

The utility model discloses a kind of refrigerator voltage compensation system, including voltage restoring circuit, the voltage restoring circuit includes sinusoidal wave pulse modulation module, transmission function module and multiwinding transformer, described two inputs of sinusoidal wave pulse modulation module connect battery plus-negative plate respectively, and the g ends of sinusoidal wave pulse modulation module connect the reference pulse voltage by electric main after transmission function block transforms.The utility model can detect input voltage in real time, when voltage keeps original power supply in normal range (NR), when voltage requires less than the minimum refrigeration of influence refrigerator, start voltage compensating circuit, cut off former power supply circuit, voltage compensating circuit is cut off when line voltage recovers to minimum requirements magnitude of voltage, starts former power supply circuit.

Description

A kind of refrigerator voltage compensation system

Technical field

A kind of compensation system is the utility model is related to, specifically a kind of refrigerator voltage compensation system.

Background technology

Household electric appliances come into the small profits epoch, and overall growth trend significantly slows down, and industry needs to upgrade, and product needs to create Newly.To obtain innovation bonus in a short time, the innovation direction of most enterprise concentrates on intelligent appliance, product appearance, product structure In terms of layout, energy-conserving and environment-protective, in addition few otherwise innovations.Innovation excessively homogeneity is difficult to turn into exclusive publicity Point attraction.With the saturation of urban market, the trend that household appliances are sold toward rural area is more and more obvious, and rural electricity consumption feature is Festivals or holidays may want several times than usual, and the food storage of refrigerator peaks the phase simultaneously.Now ensure each greenhouse of refrigerator Temperature reaches requirement and just seems critically important.Also have to performance, the reliability of household appliances with the raising user of quality of life More stringent requirement.Traditional refrigerator performance focuses on greenhouse temperature precision, the research of save etc., few electrical equipment Research in terms of operational reliability.

Dynamic electric voltage recovery device technology is applied on household electrical appliance and not had substantially at present, and the technology is mainly used in factory's confession On electricity, doctor N.G.Hingorani in 1988 proposes Custom Power concepts, is based on VSI in nearly 10 year thereafter Developing rapidly for the power quality control technology of (Voltage Source Inverter), makes DVR theory and practical basis It is established.1996, U.S. Westing-house Electric Corporation were in West Electron exhibits and conferences (Westcon) DVR research report and experimental result [1] have been delivered on first.The same year August, in the world First 2MVA DVR puts into industry park plan in North Carolina Duke Utilities Electric Co.s, and since then, DVR research and application are pulled open greatly Curtain.ABB AB is in 2000 in the Liang TaoDVRShi world todays that one famous microprocessor manufactory of Israel puts into operation Upper maximum, single capacity that covers is 22.5 MVA, and the response time of the DVR is less than 1ms, can compensate for the three of duration 500m The 50% of 35% and the single-phase voltage depression of phase voltage depression；Siemens companies are in May, 1999 in Canadian Dawson Creek One 12.5KV in area, close-coupled Platform-Mmounted on the first in the world platform bar is mounted with 500KVA distribution wire DVR (i.e. DVR PM).DVR PM using directly from power network obtain energy by the way of, eliminate additional direct current energy storage device institute Bring volume, equipment manufacturing cost and the expense of maintenance.In addition, there are many countries and research institution to develop in the world Respective DVR, and there is corresponding product to come into operation.

Research this respect to control strategy has mainly studied two aspect contents:First, structure and the control of research inverter Strategy, to improve DVR compensation ability;First, research DVR system control strategy, makes every effort to control strategy simply, comprehensively, To improve DVR dynamic property.Voltage space vector pulse width modulation technology is applied to DVR devices by document [2,3] proposition, The compensation of the phase hit to occurring with depression, Instantaneous Control load side electricity are realized with reference to software phase-lock loop (SPLL) technology The AB0 components of pressure can improve DC side efficiency to realize the compensation of zero-sequence component.Document [4-6] is directed to using linear PI controllers come to control PWM inverter be nonlinear element, the superperformance of inverter can only be ensured in regional area Problem, it is proposed that the neural network control method of DVR devices, to improve the dynamic property of nonlinear element.Document [7] proposes More Closed-loop Control Strategies of DVR voltage and current, improve the damping characteristic of controller and the load in the case of varying duty Reference voltage ability of tracking, track with zero error calculation is carried out to DVR inverter circuits to improve its dynamic and steady-state behaviour document [8] Method research, make output voltage track reference voltage, realize and the tracing compensation for not knowing voltage compensation component is controlled.Document [9] a kind of quality of power supply waveform tracking compensation control new method based on model matching technologies is proposed, is voltage, current waveform The further raising of tracing compensation control accuracy provides theories integration, is also ground for the waveform tracking control technology of association area Study carefully and provide a new way.

DVR requirement of real-time is very high, so in research in this respect, not requiring nothing more than provided detection method can Voltage sag is detected exactly;The requirement of real-time of various application scenarios can more importantly be met, can promptly be examined Measure voltage sag.After document [10] describes conventional detection method, it is proposed that d-q of practical meaning decompose mean value method and D-q decomposes low pass filtering method, it may be achieved accurate detection in real time is carried out to voltage sag amplitude, duration and phase hit.Text Offer [11- 14] proposition a kind of p-q-r coordinate transformation methods, can by abc three-phase system voltages it is no-delay transform to pqr sit The lower three-phase voltage of mark, as long as and now control p phase voltages to obtain its DC component, so that it may be with accurate judgement system voltage It is no to be recessed, so as to can determine whether to start compensation.It is clearly fixed that this method has to the positive sequence, negative phase-sequence and zero-sequence component of voltage Justice, control strategy is simple, and corresponding compensation rate detection basis can be provided for compensation of the realization to each order components.

Bibliography：

[1] SamraN A, Sundaram A. The role of the distribution system dynamic voltage restocks in enhancing the power at sensitive facilities. Westcon Conference Record , 1996 : 1 67-181；

[2] Zhan Chang jiang, Ram achandara murthyV.K, Arulampalam A, etal Dynamic voltage restorer based on voltage - space - vector PWM control IEEE Transactions on Industry Applications , 2001 ; 37( 6 ) : 1 855-1863；

[3] Zhan Chang jiang, A rulampalam A, Jenkins N. Four-wire dynamic voltage restorer based on a three -dimensional voltage space vector PWM algorithm. IEEE Transact ion s on Power Electronics , 200 3 ; 18( 4 ) : 1 093-1102；

[4]Jurado F, Hidalgo F P. Neural network control f o r dynamic voltage restorer. IEEE 28th Annual Conference of the Industrial Electronics Society , 2002 ; 1 : 61 5-620；

[5] Hang Deng, Oruganti R, Srinivasan D. Amult- inlayer neural net- work controller for single-phase inverters. The Fifth International Conference on Power Electronics and Drive System s , 2003 ; 1 :370-375；

[6]Hang Deng, Oruganti R, Srinivasan D. A neural net work – based adaptive controller of single-phase inverters for critical applications. The Fifth International Conference on Power Electronics and Drive Systems , 2003 ; 2 915-920；

[7]Vilathgamuwa D M, Perera AADR, ChoiS S. Performance improvement of the dynamic voltage restorer with closed - loop load voltage and current - mode control IEEE Transactions on Power Electronics , 2002 ; 17( 5 ): 824- 834；

[8] Ma Zhenguo, Li Peng, Zhao Baoli, wait DVR voltage waveforms tracking dead-beat control method electric power automatic Change equipment, 2005; 25( 3):13-17；

[9] Li Peng, poplar is to contain the H method for optimally controlling electrotechnics journals of the qualities of power supply, and 2005; 20 ( 10) : 88 ) 93

[10] Xiao Xiangning, Xu Yonghai, Liu Hao Detection Method of Voltage Sag Characteristics study Electric Power Automation Equipments, 2002 ; 22(1) : 19-22；

[11]KimH S , AkagiH. The Instantaneous power theory on the rotating p-q-r reference frames. Conference Records of IEEE /PED S. 99 ,1999 ; 422- 427；

[12] the research Automation of Electric Systems of the firm dynamic electric voltage recovery devices voltage compensation strategy of Feng little Ming, Yang Ren, 2004 ; 28 ( 6):68-72；

[13] Zeng Ye, Zheng Changbao, Zhu star are based on voltage sag detection method [J] meters for improving Synchronous Reference Frame Transform Calculation machine technology and development, 2007,17（8）：194-185；

[14] researchs of the long of Deng Yun based on TMS320F2812 single-phase inverters and design [D] Hefei：University of Anhui, 2013。

Utility model content

The purpose of this utility model is to provide a kind of refrigerator voltage compensation system, to solve to propose in above-mentioned background technology The problem of.

To achieve the above object, the utility model provides following technical scheme：

A kind of refrigerator voltage compensation system, it is characterised in that including voltage restoring circuit, the voltage restoring circuit includes Sinusoidal wave pulse modulation module, transmission function module and multiwinding transformer, described two inputs of sinusoidal wave pulse modulation module End connects battery plus-negative plate respectively, and the g ends of sinusoidal wave pulse modulation module are connected by electric main through transmission function block transforms Reference pulse voltage afterwards, multiwinding transformer is sent to after the filtered circuit filtering of A terminal voltages of sinusoidal wave pulse modulation module Armature winding one end, multiwinding transformer armature winding other end ground connection, filtered point of multiwinding transformer secondary windings one end Single-phase asynchronous motor A is sent to after pressure, single-phase asynchronous motor A is in series with single-phase asynchronous motor B, and single-phase asynchronous motor B is also connected with handing over Flow civil power.

Compared with prior art, the beneficial effects of the utility model are：The utility model can detect input voltage in real time, When voltage keeps original power supply in normal range (NR), and voltage requires less than the minimum refrigeration of influence refrigerator, start voltage compensation electricity Road, former power supply circuit is cut off, voltage compensating circuit is cut off when line voltage recovers to minimum requirements magnitude of voltage, start former power supply Circuit.

Brief description of the drawings

Fig. 1 is the structural representation of refrigerator voltage compensation system.

Fig. 2 is the circuit diagram of voltage restoring circuit in refrigerator voltage compensation system.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belong to the scope of the utility model protection.

Refer to Fig. 1~2, in the utility model embodiment, a kind of refrigerator voltage compensation system, line voltage is meeting ice In the range of the supply of case temperature requirement, relay 1 is closed by mains-supplied, and line voltage, which is less than, requires that relay 2 closes during magnitude of voltage Close, relay 1 disconnects, access voltage restoring circuit carries out continuing detection to circuit voltage, when line voltage recovers to requiring model When enclosing interior, relay 1 accesses, and relay 2 disconnects.

The voltage restoring circuit detects to voltage first, recovers if voltage less than voltage is started if requiring magnitude of voltage Circuit.

The voltage restoring circuit includes sinusoidal wave pulse modulation module, transmission function module and multiwinding transformer, institute State two inputs of sinusoidal wave pulse modulation module and connect battery plus-negative plate, the g ends connection of sinusoidal wave pulse modulation module respectively By reference pulse voltage of the electric main after transmission function block transforms, the A terminal voltages of sinusoidal wave pulse modulation module are through filter Be sent to multiwinding transformer armature winding one end after wave circuit filtering, multiwinding transformer armature winding other end ground connection, more around Single-phase asynchronous motor A is sent to after the group filtered partial pressure in transformer secondary output winding one end, single-phase asynchronous motor A is in series with single-phase asynchronous Motor B, single-phase asynchronous motor B are also connected with electric main.

It is obvious to a person skilled in the art that the utility model is not limited to the details of above-mentioned one exemplary embodiment, and And in the case of without departing substantially from spirit or essential attributes of the present utility model, it can realize that this practicality is new in other specific forms Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and is nonrestrictive, this practicality is new The scope of type limits by appended claims rather than described above, it is intended that the equivalency fallen in claim is contained All changes in justice and scope are included in the utility model.Any reference in claim should not be considered as limitation Involved claim.

Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art It is appreciated that other embodiment.

Claims (1)

1. a kind of refrigerator voltage compensation system, it is characterised in that including voltage restoring circuit, the voltage restoring circuit is included just String wave impulse modulation module, transmission function module and multiwinding transformer, described two inputs of sinusoidal wave pulse modulation module Battery plus-negative plate is connected respectively, and the g ends of sinusoidal wave pulse modulation module are connected by electric main after transmission function block transforms Reference pulse voltage, at the beginning of being sent to multiwinding transformer after the filtered circuit filtering of A terminal voltages of sinusoidal wave pulse modulation module Level winding one end, multiwinding transformer armature winding other end ground connection, the filtered partial pressure in multiwinding transformer secondary windings one end After be sent to single-phase asynchronous motor A, single-phase asynchronous motor A is in series with single-phase asynchronous motor B, and single-phase asynchronous motor B is also connected with exchanging Civil power.