CN104009535A - Method for undisturbed switching between double power sources of hydraulic station of refuse incinerator - Google Patents

Abstract

The invention discloses a method for undisturbed switching between double power sources of a hydraulic station of a refuse incinerator. A plurality of super-capacitors are used as energy storage elements. The problem that during switching by a commonly-used switch for the double power sources, continuous control power cannot be output is solved. By means of a power failure detection signal of double groups of mains supply, a corresponding control program is designed in the PLC control system, and heavy-load starting or acceleration of a motor is avoided in a power source switching period; according to actual power source voltage class demand, a modularized equalization circuit is used for guaranteeing that the super-capacitors which are connected in series are charged equally, and the service life of the super-capacitors is prolonged.

Description

Incinerator Hydraulic Station duplicate supply unperturbed changing method

Technical field

The invention belongs to wastes-to-power generation control technology field, relate to a kind of incinerator Hydraulic Station duplicate supply unperturbed changing method.

Background technology

Along with rubbish is growing and the contradiction of disposal ability between limited is constantly aggravated, by waste incineration and generating electricity, be to realize garbage decrement, resource and innoxious main method.In various garbage incineration technologies, mechanical type grate furnace incineration technology is by the main flow incineration technology that is current and following house refuse.Rubbish is by the incinerator that is moved into of dispenser, realize again the abundant mixing and burning of rubbish and air by the reciprocating motion of fire grate, by means of boiler and turbo generator, realize the conversion of chemical energy → heat energy → electric energy, thereby realize waste incineration and generating electricity process.The operational effect of waste incineration and generating electricity is related to municipal administration, environmental protection and energy scheduling, and great on people life and social impact, therefore, the main equipment of the garbage incinerating power plant that requirement puts into operation must have high reliability.The whole process of waste incineration and generating electricity is all closely related with the operation of fire grate, dispenser, the bed of material, slag remover and isolating door or the state at its place, the motion of each object relies on Hydraulic Station to provide power source to be achieved, and therefore the Hydraulic Station of incinerator all requires to adopt duplicate supply to guarantee its reliability.

Although existing incinerator has adopted two groups of civil powers to power, also must adopt UPS that continuous control power supply is provided.When two groups of civil powers wherein one group have a power failure or when fault; twin-power switch can automatically switch to another group civil power; for avoiding the short circuit problem in handoff procedure; switch and need interlock protection; and the mechanical switching mechanism using needs regular hour ts (twin-power switch of use is depended in ts >=0.2 second).The heavy-duty motor that switching time, ts used for Hydraulic Station only there will be of short duration reduction of speed and the transient-upset of raising speed again, can not affect the needed power of incinerator drive system.For controlling power supply, in handoff procedure, provide continuous power supply by UPS.

Existing scheme does not detect the whether power down of two groups of civil powers, and control system is without any cue, but is directly switched by the first switch of two electricity.There is following defect:

1. use UPS, although in the handoff procedure of two mains supplies, can realize the unperturbed switching (continuous control power supply is provided) of controlling power supply, UPS needs periodic maintenance, long when interruption duration, easily there is over-discharge can and the problem that cannot charge in battery.The construction of garbage incinerating power plant needs the time of 2-3, and equipment is installed time that need to be longer successively, with the UPS of coordinative composition of equipments often because the phenomenon that over-discharge can cannot be charged is commonplace.

2. existing scheme does not provide the detection of power loss signal of two groups of civil powers, in the time that multiple proportioning valves, the electromagnetically operated valve of hydraulic system are in operating state, there is the switching of two groups of civil powers, first motor is reduction of speed between transfer period, then be to be again with heavily loaded raising speed, impulse current is larger; If because fault has occurred the oil pump of work, just in time there is again the switching of oil pump between transfer period, can bypass star triangle start-up logic, there is very large starting current.

3. existing scheme and control system do not have cue, and control system cannot gather the power supply trouble signal of two groups of civil powers.

Summary of the invention

In order to overcome the defect existing in prior art, the control power supply that the present invention is intended to simplify between existing duplicate supply transfer period provides scheme, effectively solves and between duplicate supply transfer period, uses UPS when controlling power supply, the problem that can not charge because of its power shortage; By means of detection of power loss and cue, by program control, reduce motor raising speed or inrush current, improve cost performance, the reliability and maintainability of power-supply system, reduce the weight and volume of equipment.The present invention proposes a kind of incinerator Hydraulic Station duplicate supply unperturbed changing method, and the method is using super capacitor as energy-storage travelling wave tube, and the conventional twin-power switch of solution cannot be exported the problem of continuous control power supply between transfer period; By means of the detection of power loss signal of two groups of civil powers, in PLC control system, design corresponding control program, avoid motor during electrical source exchange, to occur heavy load starting or raising speed; According to actual supply voltage level requirements, adopt modular equalizing circuit to guarantee many super capacitor equalizing charges of series connection, extend the electric capacity life-span.

Its technical scheme is as follows:

A kind of incinerator Hydraulic Station duplicate supply unperturbed changing method, taking super capacitor as energy-storage travelling wave tube, for exporting continuous control power supply during Twin-power swich, by the detection of power loss signal of two groups of civil powers, avoid heavy load starting or the raising speed problem during Twin-power swich in conjunction with PLC control program.Comprise the following steps:

The first step: budgetary estimate duplicate supply with load, select accordingly two electric switches.

Second step: select current transformer, voltmeter and ammeter according to total current.

The 3rd step: the capacity of budgetary estimate super capacitor and electric capacity quantity.

The 4th step: the current-limiting resistance of the charge circuit of budgetary estimate super capacitor and oppositely twin zener dioder.

The 5th step: the charging balanced circuit of making super capacitor.

The 6th step: make two civil power power-fail detection circuits

The 7th step: assembling double power-supply system.

The 8th step: introduce interrupt control logic and write corresponding control program in PLC system.

The 9th step: the unperturbed of inspection duplicate supply switches.

Beneficial effect of the present invention is: the present invention effectively solves and between duplicate supply transfer period, uses UPS when controlling power supply, the problem that can not charge because of its power shortage; By means of detection of power loss and cue, by program control, reduce motor raising speed or inrush current, improve cost performance, the reliability and maintainability of power-supply system, reduce the weight and volume of equipment.The present invention proposes a kind of incinerator Hydraulic Station duplicate supply unperturbed changing method, and the method is using super capacitor as energy-storage travelling wave tube, and the conventional twin-power switch of solution cannot be exported the problem of continuous control power supply between transfer period; By means of the detection of power loss signal of two groups of civil powers, in PLC control system, design corresponding control program, avoid motor during electrical source exchange, to occur heavy load starting or raising speed; According to actual supply voltage level requirements, adopt modular equalizing circuit to guarantee many super capacitor equalizing charges of series connection, extend the electric capacity life-span.

Brief description of the drawings

Fig. 1 is the charging balanced circuit of super capacitor;

Fig. 2 is super capacitor equalizing circuit plate;

Fig. 3 is civil power power-fail detection circuit;

Fig. 4 is incinerator Hydraulic Station double power-supply system;

Fig. 5 is that waste incineration and generating electricity petrol station duplicate supply switches PLC system break program flow diagram.

Embodiment

Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in more detail.

A kind of incinerator Hydraulic Station duplicate supply unperturbed changing method, is characterized in that, comprises the following steps:

The first step: budgetary estimate load, select twin-power switch

The main power consumption equipment of waste incineration and generating electricity Hydraulic Station (petrol station) comprises two main oil pump motors, 2 coolant pumps and 1 group of heater, 1 group of DC power supply and 1 cover control system.Main oil pump motor and coolant pump motor are all the using and the reserved working methods, therefore, only consider the power consumption of 1 main oil pump and 1 coolant pump.

The gross power of power-supply system is as follows:

$\left\{\begin{array}{c}{P}_{\mathrm{All}}=k_p(P_{\mathrm{OilPump}}+P_{\mathrm{CoolPump}}+P_{\mathrm{Heater}}+P_{\mathrm{DC}}+P_{\mathrm{ConSys}})\\ I_{\mathrm{All}}=\frac{P_{\mathrm{All}}}{\sqrt{3}U}=\frac{P_{\mathrm{All}}}{\sqrt{3}\×380}\end{array}\right.$

$\left(1\right)$

K _p=1.5～3.0 is gross power surplus coefficient, depends on the quality of load impact and twin-power switch etc.; According to the total current calculating, the upwards regular rated current to selected twin-power switch.

Second step: select current transformer, voltmeter and ammeter according to total current

$I_{\mathrm{All}}=k_I\frac{P_{\mathrm{All}}}{\sqrt{3}U}---\left(2\right)$

K _i=1.2～1.5, can survey electric current surplus coefficient for instrument transformer, avoid occurring outrange.

The 3rd step: the capacity of budgetary estimate super capacitor and electric capacity quantity

Press capacity and the quantity of single super capacitor of following formula budgetary estimate:

$C=\frac{\mathrm{mAs}/1000}{\mathrm{\ΔU}/n}$ (farad) (3)

$n=k_c\frac{U}{U_c}=k_c\frac{24}{U_c}---\left(4\right)$

In formula, mAs (milliampere. second) energy for being provided by super capacitor between duplicate supply transfer period; Δ U is the permission disturbance (disregarding the output error of direct voltage and the oppositely pressure drop of restriction diode) of 24V DC control supply, the withstand voltage that Uc is single electric capacity, k _c=1.1～1.5 is surplus coefficient

The 4th step: the current-limiting resistance of the charge circuit of budgetary estimate super capacitor and oppositely twin zener dioder

$R=k_R\frac{U}{I_c}=k_R\frac{24}{I_c}---\left(4\right)$

I _D＝k _DI _c (5)

In formula, k _r=1.0～1.2 is current-limiting resistance surplus coefficient, I _cfor charging current.U is for controlling supply voltage (being 24V)

I _dfor selecting the current reference value of reverse twin zener dioder, k _d=2.0～5.0.

The 5th step: the charging balanced circuit of making super capacitor

Make the charging balanced circuit of super capacitor by Fig. 1, for the ease of being connected with many super capacitors of series connection, charging balanced circuit identical 10 covers is made into a printed circuit board, use screw type terminal to draw UC+ and the UC-of every cover equalizing circuit; As shown in Figure 2.

The 6th step: make two civil power power-fail detection circuits

Make civil power power-fail detection circuit by Fig. 3, two groups of civil powers need to use the testing circuit that 2 covers are identical.Wherein one being connected of respectively with two groups of civil powers of L11 and N of two cover circuit; The output signal Ix.y of power-fail detection circuit is as the interrupting input signal of PLC system.

The 7th step: assembling double power-supply system

Assemble the required double power-supply system of waste incineration and generating electricity petrol station by Fig. 4.Two groups of twin-power switch (ATS) inputs respectively with the connection of civil power, two three-phase voltage meters He Liangzu cities electrical connections respectively; Three phase ammeter is connected with the load power source of ATS output by instrument transformer; The power consumption equipments such as the main oil pump of petrol station, coolant pump, heater are connected with load power source by low-voltage electrical apparatus; Take from the load power source that ATS provides with the ac input end of the 24V DC power supply of action control system power supply; The output of DC power supply with the power supply of action control system, is connected with super capacitor simultaneously after current-limiting resistance and reverse twin zener dioder.Equalizing circuit is connected with super capacitor.

The 8th step: introduce interrupt control logic and write control program in PLC system

PLC carries out interrupt handling routine after receiving detection of power loss signal, and its control flow as shown in Figure 5.When PLC detects wherein one group of civil power power down that load is used and enters electrical source exchange, enter interrupt service routine.First put power down mark, for DCS or central control system provide cue, and turn-off electromagnetically operated valve and proportioning valve, allow hydraulic system in zero load.Then process respectively according to two kinds of different situations, start to reduce motor raising speed or △ type the impulse current causing.If during electrical source exchange, there is again main oil pump switching, time delay, after 0.5 second, starts main oil pump by Y-△ start-up logic, reduces impulse current by reduced voltage starting; If during electrical source exchange, main oil pump moves, and switches to Y pattern formula; Time delay switches to △ operational mode again after 0.5 second.Finally recover electromagnetically operated valve and the proportional valve control logic of turn-offing.

The 9th step: the unperturbed that power supply is controlled in inspection switches

Using actual waste incineration and generating electricity petrol station PLC control system and supporting transducer as load, if when two groups of electrical source exchanges, the operation of PLC control program has sustainability, reduction of speed, raising speed or the starting of motor are steadily, PLC correctly receives detection of power loss signal, and the realization of waste incineration and generating electricity petrol station duplicate supply unperturbed handover success is described.

Taking 600t/d incinerator petrol station as example, provide the specific implementation step that its duplicate supply unperturbed switches.

The first step: load budgetary estimate and twin-power switch are selected

Main oil pump motor is that 55kW, coolant pump motor are 4kW, and both are the using and the reserved working method; Three heaters adopt Y type to connect, and every phase power is 2kW; DC power supply is pressed 1kW budgetary estimate; Control system is pressed 1kW budgetary estimate.

The gross power of power-supply system is as follows:

$\left\{\begin{array}{c}{P}_{\mathrm{All}}=k_p(55+4+2+1+1)=2.5\×63=157.5\mathrm{kW}\\ I_{\mathrm{All}}=157.5\×1000/(1.732\×380)=239.3A\end{array}\right.$

Consult the soar type selecting handbook of double power supply converting switch of company of Suzhou, select W250 to satisfy the demands, its rated current is 250A.

Second step: select current transformer, voltmeter and ammeter according to electric current

$I_{\mathrm{All}}=k_I\frac{P_{\mathrm{All}}}{\sqrt{3}U}=1.2\×157.5\×1000/(1.732\×380)=299.1A$

Press 300A and select current transformer, three phase ammeter is selected LZS2150 (Chongqing Lu Zhisheng company product), and its input current is 5A, and therefore the no-load voltage ratio of instrument transformer is 60.Three-phase voltage meter is LZS2160.

The 3rd step: the capacity of budgetary estimate super capacitor and electric capacity quantity

Between duplicate supply transfer period, require super capacitor that 5 amperes of electric energy of 2 seconds are provided, allowing 24V to control supply voltage disturbance is 10%,

Select the super capacitor that withstand voltage is 2.7V.:

The super capacitor quantity needing: need 10 electric capacity.

Every super capacitor capacity: $C=\frac{\mathrm{mAs}/1000}{\mathrm{\ΔU}/n}=\frac{5000\×2/1000}{24\×0.1/10}=41.7\left(F\right)$

Accordingly, select " HCAP-C2R7 606 " of Beijing He Zhonghuineng company, its capacity is 60 farads, and withstand voltage is 2.7V.

The 4th step: the current-limiting resistance of the charge circuit of budgetary estimate super capacitor and oppositely twin zener dioder

Getting charging current is 2A

$R=k_R\frac{U}{I_c}=1.0\×\frac{24}{2}=12\mathrm{\Ω},$ Power is: P _r=2 ²× 12=48W

I _D＝5×2＝10A

Backward diode is selected MBRB2060CT, and its rated current is 20A.

The 5th step: the charging balanced circuit that connects super capacitor

Connect super capacitor equalizing circuit by Fig. 2.10 super capacitors only need use a block balance circuit board (every block balance circuit board has 10 cover equalizing circuits).The UC1+ of equalizing circuit plate and UC1-are connected respectively to anode and the negative terminal of super capacitor C1, by that analogy, the UC10+ of equalizing circuit plate and UC10-are connected respectively anode and the negative terminal of super capacitor C10.

The 6th step: make and be connected electric power-fail detection circuit

Press Fig. 3 and make and be connected civil power power-fail detection circuit, the L1 of 2 groups of civil powers is connected with the L11 of power-fail detection circuit respectively mutually, the Ix.y of power-fail detection circuit is connected with I0.1 with the I0.0 of PLC system respectively.

The 7th step: assembling double power-supply system

Assemble waste incineration and generating electricity petrol station double power-supply system by Fig. 4.

The 8th step: introduce interrupt control logic and write control program in PLC system

PLC configuration has the switching input module of interrupt function, I0.0 and the I0.1 (can change with actual disposition) of detection of power loss signal access PLC system, in hardware configuration, select rising edge to interrupt (while being power down, I0.0 or I0.01 are 24V).In program, add an OB40 tissue block, in piece, press the flow process programming shown in Fig. 5.

The 9th step: the unperturbed of inspection duplicate supply switches.

Use the PLC system of 600t/d incinerator Hydraulic Station to control the inspection that power supply unperturbed switches, the configuration of PLC system is as follows:

CPU host module: 6ES7 315-2AH14-0AB0,1

32 way switch amount input modules: 6ES7 321-1BL00-0AA0,5

16 way switch amount output modules: 6ES7 322-1BH01-0AA0,1

32 way switch amount output modules: 6ES7 322-1BL00-0AA0,1

8 road analog output modules: 6ES7 332-5HF00-0AB0,1

Input module has been simulated on 2 tunnels: 6ES7 331-7KB02-0AB0,1

DP communication processor module: 6ES7 342-5DA01-0XE0,1

ET200M interface module: 6ES7 153-1AA03-0XB0,1

DP digital displaying meter: RDM408,1

24V DC power supply, except being this PLC control system power supply, is also temperature transmitter and 56 two-wire system approach switch power supplies of petrol station.Two groups of civil powers of the artificial switching of switch logic by ATS are tested.

Measured result is: the direct current pressure drop in handoff procedure is less than 0.5 volt, and the disturbance time is less than 0.2 second, and handoff procedure is on the operation of PLC system without impact, and reduction of speed, the raising speed of motor are steady, and lower than its rated current, PLC system is correctly received civil power power-off signal.This process shows, waste incineration and generating electricity petrol station duplicate supply is successfully realized unperturbed and switched.

The above; it is only preferably embodiment of the present invention; protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in, the simple change of the technical scheme that can obtain apparently or equivalence replace all fall within the scope of protection of the present invention.

Claims (2)

1. an incinerator Hydraulic Station duplicate supply unperturbed changing method, is characterized in that, comprises the following steps:

The first step: budgetary estimate duplicate supply with load, select accordingly two electric switches;

Second step: select current transformer, voltmeter and ammeter according to total current;

The 3rd step: the capacity of budgetary estimate super capacitor and electric capacity quantity;

The 4th step: the current-limiting resistance of the charge circuit of budgetary estimate super capacitor and oppositely twin zener dioder;

The 5th step: the charging balanced circuit of making super capacitor;

The 6th step: make two civil power power-fail detection circuits;

The 7th step: assembling double power-supply system;

The 8th step: introduce interrupt control logic and write corresponding control program in PLC system;

The 9th step: the unperturbed of inspection duplicate supply switches.

2. incinerator Hydraulic Station duplicate supply unperturbed changing method according to claim 1, it is characterized in that, using super capacitor as energy-storage travelling wave tube, for exporting continuous control power supply during Twin-power swich, by the detection of power loss signal of two groups of civil powers, in conjunction with PLC control program, avoid heavy load starting or raising speed problem during Twin-power swich.