CN104317339A - Dehumidification and anti-condensation intelligent control system and method for ring main unit - Google Patents

Abstract

The invention discloses a dehumidification and anti-condensation intelligent control system and method for a ring main unit. The system is based on the thermoelectric refrigeration technology and the wireless sensor network technology, a fuzzy fractional order PID controller is adopted, the temperature and the humidity of the working environment are monitored in real time, and intelligent control dehumidification is achieved. In combination with a wireless sensor network platform with the complete function, a user can achieve the purposes of holding a device for polling in a field and remotely and online monitoring the state of equipment in real time. The condensation dehumidification device can effectively reduce the humidity of space air, the condensation phenomenon is avoided, and the condensation dehumidification device has the advantages of being small in size, low in operation cost, long in service life and high in reliability, and is widely applied to dehumidifying various closed cabinets such as a switch cabinet, a power distribution cabinet and a terminal box.

Description

A kind of dehumidifying condensation proof intelligent control system of ring main unit and method

Technical field

The invention belongs to power equipment Temperature and Humidity Control technical field, be specifically related to a kind of dehumidifying condensation proof intelligent control system and method for ring main unit.

Background technology

Various electric power and the communication apparatus such as switch cubicle, electrical control cabinet, terminal box, headstock is widely used in electrical network.When air humidity is too high in cabinet, can switching circuit be corroded, the interposer contact resistance of components and parts joint area is increased, and then cause functions of the equipments to lose efficacy and fault, and the components and parts that sealing may be made bad are breakdown.When electronic devices and components surface sweating, components and parts short circuit can be caused, possibly damage equipment, threaten the safe operation of electrical network.

Dehumidification by condensation device is installed in rack, by the hydrone in air being condensed into aqueous water and being expelled to enclosure space outside, effectively can reduce the humidity of space gases, avoid electronic devices and components surface sweating, reduce the high-voltage breakdown risk of insulating device, improve the reliability of device, the serviceable life of extension device.

The patent No. is CN201420287707.0, and the utility application that name is called " the anti-condensation dehydrating unit of a kind of switch cubicle " devises the anti-condensation dehydrating unit of a kind of switch cubicle, does not design corresponding controller; The patent No. is CN201410373842.1, name is called that the application for a patent for invention of " a kind of all-digital intelligent Temperature and Humidity Control dehumidification system and dehumanization method " devises a kind of all-digital intelligent Temperature and Humidity Control dehumidification system, this Operation system setting is in the cabinet shell of power equipment, include the controller of well heater, dehumidifier, connection control well heater and dehumidifier and the Temperature Humidity Sensor of controller can be communicatively coupled to, but the controller that this patent adopts is only the control on conventional integer rank.

At present about the research of the modeling and control technology in switch cubicle temperature and humidity control system, analyze mainly for integer order system model and control, there is certain limitation.That control system and object are considered as integer rank system substantially in existing Systems Theory, and the system existed in reality is all more or less non-integer order, i.e. fractional-order, therefore utilize the differentio-integral equation of fractional-order to system be described by more accurately, closer to system actual conditions.

In sum, consider current switch cubicle Temperature and Humidity Control Problems existing, need a kind of new method to solve the problem.

Summary of the invention

For overcoming above-mentioned defect, the invention provides a kind of dehumidifying condensation proof intelligent control system and method for ring main unit, this system comprises dehumidification by condensation controller, dehumidifier, hand-held set, data basestation, administrative center.By wireless channel interaction data between described controller, hand-held set, data basestation; Hand-held set and data basestation can receive the wireless data of self-controller, also can control and optimum configurations controller; Described hand-held set is by WiFi, Bluetooth, data line or storage card mode and administrative center's interaction data, and data basestation is connected with administrative center by Ethernet or serial mode.

This system adopts fuzzy score rank pid control algorithm to realize the controlling functions of controller.

Present system major functions and features:

(1) Real-Time Monitoring environment temperature, relative humidity, dewpoint temperature, Based Intelligent Control dehumidifies, the generation of prevention dew condensation phenomenon.

(2) support that on-the-spot hand-held set patrols and examines the application with long-range real time on-line monitoring equipment state.

(3) local display and optimum configurations is supported.

(4) apply thermoelectric cooling technology, without the need to using cold-producing medium or drying agent, equipment volume is little, reliability is high, easy installation and maintenance, can work in severe, the responsive or environment of narrow space.

(5) equipment can run for a long time continuously, and power consumption is little, and operating cost is low.

(6) installation electromagnetical compatibility is functional, can be used on and requires higher occasion to EMC.

(7) one tunnels (expansion) for subsequent use relay interface, the equipment such as accessible light fixture, fan, well heater, electromagnet realize Remote operation, facilitate user to expand usable range.

Accompanying drawing explanation

Fig. 1 is the structural representation of control system of the present invention.

Fig. 2 is the structure principle chart of controller of the present invention.

Fig. 3 is the structure principle chart of dehumidifier of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, illustrate the present invention further.

It is to be understood that content of the present invention and embodiment are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art inspired by the spirit and principles of the present invention, can do various amendment, equivalent replacement or improve.But these changes or amendment are all in the protection domain that application is awaited the reply.

Fig. 1 is the structural representation of control system of the present invention.Control system is made up of controller, dehumidifier etc., and split-type design makes device possess larger Installation Flexibility; In addition, controller only connects dehumidifier power supply when needs dehumidifying, greatly can extend the tenure of use of dehumidifier power module thus.

The structural principle of controller as shown in Figure 2.Controller is primarily of functional unit compositions such as control circuit, AC/DC insulating power supply module, Temperature Humidity Sensor circuit, radio-frequency receiving-transmitting integrated circuit, Chinese lattice lcd module, relay, antennas.

Controller panel: 4 buttons, 3 pilot lamp, 1 lattice lcd screen (or charactron module).

Control unit interface: 1 road power input interface, 2 road relay normally open output interfaces (relay capacity is 250VAC, 10A), 1 road indicating fault input interface (dehumidifier working state monitoring).

Principle of work: the information such as real-time measurement and display environment temperature, relative humidity, dewpoint temperature after controller powers on, by compare relative humidity, dewpoint temperature measured value and setting threshold value control dehumidifier work, point being monitored ambient humidity is within default condition all the time.Controller work state information and environment epidemic disaster data all can be sent by wireless channel, and user can realize the object of monitor equipment status by Wireless Sensor Network Platform.

Present system the key technical indexes:

(1) working power: 85 ~ 265VAC (50/60Hz)/120 ~ 370VDC;

(2) monitoring control devices power consumption: < 0.5W;

(3) dehumidifier power consumption: < 36W;

(4) moisture removal: >=5mL/h (30 DEG C, 85%RH);

(5) relative humidity measurement scope: 0%RH ~ 100%RH;

(6) relative humidity measurement precision: ± 3%RH (20%RH ~ 80%RH@25 DEG C);

(7) temperature measurement range :-40 DEG C ~ 85 DEG C;

(8) temperature measurement accuracy: ± 1 DEG C (0 DEG C ~ 50 DEG C);

(9) dew point temperature measurements scope: 0 DEG C ~ 50 DEG C;

(10) operating ambient temperature :-20 DEG C ~ 65 DEG C;

(11) working environment humidity: 20%RH ~ 95%RH (without condensation);

(12) wireless communication frequency: 2.4 ~ 2.5GHz;

(13) wireless device radiation power: 0dbm;

(14) controller physical dimension: 78mm*48mm*80mm (the wide * of long * is high, containing base);

(15) dehumidifier physical dimension: 160mm*110mm*68mm (the wide * of long * is high);

(16) dehumidification by condensation device mounting means: screw is fixed or standard 35mm guide rails assembling;

Controller the key technical indexes of the present invention:

(1) working power: 85 ~ 265VAC (50/60Hz)/120 ~ 370VDC;

(2) power consumption is monitored: < 0.5W;

(3) wireless communication frequency: 2.4 ~ 2.5GHz;

(4) wireless device radiation power: 0dbm;

(5) wireless communication distance: > 300 meters (straight open ground, with-90dB base station communication)

(6) relative humidity measurement scope: 0%RH ~ 100%RH;

(7) relative humidity measurement precision: ± 3%RH (20%RH ~ 80%RH@25 DEG C);

(8) temperature measurement range :-40 DEG C ~ 85 DEG C;

(9) temperature measurement accuracy: ± 1 DEG C (0 DEG C ~ 50 DEG C);

(10) dew point temperature measurements scope: 0 DEG C ~ 50 DEG C;

(11) operating ambient temperature: 0 DEG C ~ 50 DEG C (band liquid crystal display) ,-20 DEG C ~ 65 DEG C (without liquid crystal display);

(12) working environment humidity: 20%RH ~ 95%RH (without condensation);

(13) physical dimension: 78mm*48mm*80mm (the wide * of long * is high, containing base);

(14) enclosure material: die casting aluminium, surface lacquer process;

(15) expected life: > 50000h@25 DEG C;

(16) mounting means: screw is fixed or standard 35mm guide rails assembling;

The structural principle of dehumidifier as shown in Figure 3.Dehumidifier is primarily of compositions such as AC/DC insulating power supply module, temperature sensor, ball bearing fan, semiconductor chilling plate, hot-side heat dissipation device, cold junction heating radiator, water accumulating discs.

Dehumidifier principle of work: after dehumidifier startup work, semiconductor chilling plate produces cold-thermal effect under certain voltage, when cold junction spreader surface temperature is lower than air dew point temperature, hydrone in air will condense on cold junction heating radiator, condensing drip drops down onto water accumulating disc and drains into seal cavity outside, finally reaches the object reducing working environment humidity; Fan be used for hot-side heat dissipation device heat radiation, strengthen air flowing to improve dehumidification rate; Temperature sensor is for monitoring the temperature of cool and heat ends heating radiator, and whether control circuit breaks down according to the controlled refrigeration end radiator temperature of temperature value and detection semiconductor chilling plate.

Fuzzy control rule is the core of whole fuzzy control, the error e being input as switch cubicle humiture of delivery fuzzy controllers of the present invention and the rate of change e of error _c, fuzzy subset be set to negative large, negative in, negative little, zero, just little, center, honest.Input/output variable selects triangle to set up membership function.

For different humiture errors and error rate, fuzzy score rank PID controller parameter K _p, K _i, K _dlarge I by following rule:

(1) when e is larger, larger K should be got _p, and less K _d, larger K _pthe response speed of system can be accelerated, and less K _din order to strengthen system rejection to disturbance performance, now system by tracking performance also better, simultaneously in order to avoid K appears larger overshoot, in system responses _iget little as far as possible.

(2) when e is in median size, in order to make system responses have less overshoot, less K should be got _pwith suitable K _i, K _d.

(3) when e is less, at this moment the adjustment of parameters is mainly for control e _c, reduce the steady-state error of system, so should by K _p, K _iobtain large, make system have good steady-state behaviour, simultaneously in order to avoid system produces vibration, also will according to e _cthe variation tendency adjustment K of value _dsize.

The large I of controling parameters Δ λ, Δ μ is determined by following rule:

() is when e is larger, no matter e _cvalue much, the object at this moment controlled, mainly for eliminating deviation, so get larger Δ λ, makes mainly to come to strengthen by the integral element of raising system without margin.

(2) when e is in median size, get suitable Δ λ, Δ μ and ensure system stability and prevent system overshoot.

(3) when e is less, the object of control produces overshoot mainly for anti-locking system and accelerates the steady sufficient speed of system, so need the value adjusting Δ λ, Δ μ according to the value of ec.

The parameter expression that fuzzy logic is adjusted is:

$\left\{\begin{array}{c}{K}_p=K_{p0}+\mathrm{\&Delta;}{K}_p\\ K_i=K_{i0}+\mathrm{\&Delta;}{K}_i\\ K_d=K_{d0}+\mathrm{\&Delta;}{K}_d\\ \mathrm{\&lambda;}={\mathrm{\&lambda;}}_0+\mathrm{\&Delta;\&lambda;}\\ \mathrm{\&mu;}={\mathrm{\&mu;}}_0+\mathrm{\&Delta;\&mu;}\end{array}\right.$

Wherein K _p0, K _i0, K _d0, λ ₀, μ ₀for controller parameter initial value, Δ K _p0, Δ K _i0, Δ K _d0, Δ λ, Δ μ be after the result of fuzzy reasoning, the increment of corresponding parameter that obtains.

Claims (2)

1. the dehumidifying condensation proof intelligent control system of ring main unit and a method, is characterized in that: comprise dehumidification by condensation controller, dehumidifier, hand-held set, data basestation, administrative center.By wireless channel interaction data between described controller, hand-held set, data basestation; Hand-held set and data basestation can receive the wireless data of self-controller, also can control and optimum configurations controller; Described hand-held set is by WiFi, Bluetooth, data line or storage card mode and administrative center's interaction data, and data basestation is connected with administrative center by Ethernet or serial mode.

2. the dehumidifying condensation proof intelligent control system of a kind of ring main unit according to claim 1 and method, is characterized in that: adopt fuzzy score rank pid control algorithm to realize the controlling functions of controller.