CN103161663A

CN103161663A - Low-cost variable pitch system

Info

Publication number: CN103161663A
Application number: CN2011104270788A
Authority: CN
Inventors: 傅建民; 林盈杰
Original assignee: Reenergy Electric Suzhou Co Ltd
Current assignee: Reenergy Electric Suzhou Co Ltd
Priority date: 2011-12-19
Filing date: 2011-12-19
Publication date: 2013-06-19

Abstract

The invention discloses a low-cost variable pitch system which comprises a programmable logic controller (PLC) module, an absolute value encoder and a variable pitch driver, wherein the variable pitch driver is provided with a digital signal processor (DSP). An output end of the absolute value encoder is communicated with an input end of the DSP by a small scale integration (SSI) port, and an output end of the DSP is communicated with an input end of the PLC module, through a communication mode. An existing hardware condition is used so as to save multiple PLC modules, and reduce the number of lines between equipment cabinet plugs. A communication module on the PLC module only needs increasing, so that working load of the PLC module is reduced, and cost of a variable pitch system is reduced.

Description

A kind of pitch-controlled system cheaply

Technical field

The present invention relates to wind power generation field, relate in particular to a kind of pitch-controlled system cheaply.

Background technique

The function that pitch-controlled system is mainly realized is to change according to wind speed, control the angle of blade rotary, guarantee the wind power generating set constant power output, the formation scheme of pitch-controlled system commonly used comprises at present: control cabinet in one, include the PLC module, the axle control cabinet of 3 integrated drives, 3 battery racks, the motor of 3 integrated thermistors, absolute value encoder, braking device, 3 redundancy absolute value encoders, 6 limit switches.Motor absolute value encoder signal passes to the PLC module by synchronous serial interface, and the PLC module needs three road EL5001 coder module to receive this signal, thereby obtains the motor actual position signal; Variable pitch driver obtains the motor actual speed by the incremental encoder that is arranged on the tachometer generator on motor or be compounded on absolute value encoder, controls in order to motor is carried out speed; The PLC module is exported analog voltage signal to three variable pitch drivers, as speed preset by an EL4034 analog output module; Also need two EL3112 modules to detect current of electric in the PLC module; And several EL3204 modules are come detected temperatures; This a series of module has not only increased the complexity of whole system, makes the running of PLC module high load, has also increased maintenance difficulties, has caused hardware and human cost to raise.

Summary of the invention

In view of the defective that above-mentioned prior art exists, the objective of the invention is to propose a kind of slurry system of becoming cheaply, to save hardware module, reduce PLC module load, reduce the PLC module heating, be lowered into simultaneously the cost of a system.

Purpose of the present invention will be achieved by the following technical programs:

A kind of pitch-controlled system cheaply, comprise the PLC module, absolute value encoder and variable pitch driver, described variable pitch driver is provided with dsp processor, the output terminal of described absolute value encoder is communicated with the input end of described dsp processor by the SSI interface, and the output terminal of described dsp processor is by the input end of communication modes and PLC module.

Preferably, above-mentioned a kind of pitch-controlled system cheaply, wherein: described absolute value encoder is 16 absolute angle coders of individual pen, and the output data mode of described absolute value encoder is Gray code; Described dsp processor is TMS320F2812; Described SSI interface is that the SSI208P interface turns the parallel port module; The output terminal of described absolute value encoder is connected with the input end that described SSI208P interface turns the parallel port module; Eight bit data bus D0～D7 that described SSI208P interface turns the parallel port module is connected with low eight bit data bus XD0～XD7 of described TMS320F2812; Because the absolute value encoder that uses is 16, so only need a bit address line can distinguish absolute value encoder data high eight-bit and low eight; Described TMS320F2812 /XZCS67 and described SSI208P interface turn the parallel port module /CS is connected, and uses the external address sheet to select pin/XZCS67 to turn the outside chip selection signal of parallel port module as the SSI208P interface; The universal I/O port GPIOB4 of described TMS320F2812 is connected with the START that described SSI208P interface turns the parallel port module, controls the SSI208P interface and turns parallel port module startup; The universal I/O port GPIOB5 of described TMS320F2812 and described SSI208P interface turn parallel port module/END and are connected, and carry out the SSI208P interface and turn parallel port module converts done state inquiry; Described SSI208P interface turns CLKMD0, the CLKMD1 of parallel port module and GRAY and connects respectively and draw resistance to draw high, and it is 2MHz that the SSI208P interface is turned parallel port module synchronised clock frequency allocation; The GRAY pin is drawn high, and the SSI208P interface turns the parallel port module Gray code data transfer of absolute value encoder output is become binary-coded decimal.

Preferably, above-mentioned a kind of pitch-controlled system cheaply, wherein: be respectively equipped with a communication module on described PLC module and described dsp processor.

Preferably, above-mentioned a kind of pitch-controlled system cheaply, wherein: described communication module is 485 communication modules or CAN communication module.

The present invention just can calculate the motor actual speed by the position signal of absolute value encoder itself, and ratio of precision incremental encoder rate accuracy is higher; Variable pitch driver itself just detects current of electric in real time, in order to motor is carried out speed regulating control; The dsp processor that adopts on variable pitch driver has 16 road AD sampling channels, itself can gather the temperature signal that PT100 detects.Therefore the present invention utilizes the existing hardware condition, a lot of functions of PLC inside modules can realize in variable pitch driver, the information that the PLC module is required and data can be uploaded by the communication between variable pitch driver and PLC module, thereby can save a lot of modules of PLC module, and reduced line number between the rack plug, only need to increase communication module on the PLC module, make the PLC module be absorbed in the pitch-controlled system motion control, reduce PLC module working load, reduced the heating value of PLC module and the cost of whole pitch-controlled system.

Following constipation closes embodiment's accompanying drawing, the specific embodiment of the present invention is described in further detail, so that technical solution of the present invention is easier to understand, grasp.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the present invention;

Fig. 2 is the TMS320F2812 of the embodiment of the present invention, the catenation principle figure that the SSI208P interface turns parallel port module and absolute value encoder;

Fig. 3 is the flow chart that the SSI208P interface of the embodiment of the present invention turns the parallel port module.

Embodiment

Embodiment:

A kind of pitch-controlled system cheaply of the present embodiment, as Fig. 1～shown in Figure 2, comprise the PLC module, absolute value encoder and variable pitch driver, variable pitch driver is provided with dsp processor, the output terminal of absolute value encoder is communicated with the input end of dsp processor by the SSI interface, and the output terminal of dsp processor is by the input end of communication modes and PLC module.Wherein: absolute value encoder is 16 absolute angle coders of individual pen, and the output data mode of absolute value encoder is Gray code; Dsp processor is TMS320F2812; The SSI interface is that the SSI208P interface turns the parallel port module; The output terminal of absolute value encoder is connected with the input end that the SSI208P interface turns the parallel port module; Eight bit data bus D0～D7 that the SSI208P interface turns the parallel port module is connected with low eight bit data bus XD0～XD7 of TMS320F2812; Because the absolute value encoder that uses is 16, so only need a bit address line can distinguish absolute value encoder data high eight-bit and low eight; TMS320F2812 /XZCS67 and SSI208P interface turn the parallel port module /CS is connected, and uses the external address sheet to select pin/XZCS67 to turn the outside chip selection signal of parallel port module as the SSI208P interface; The universal I/O port GPIOB4 of TMS320F2812 is connected with the START that the SSI208P interface turns the parallel port module, controls the SSI208P interface and turns parallel port module startup; The universal I/O port GPIOB5 of TMS320F2812 and SSI208P interface turn parallel port module/END and are connected, and carry out the SSI208P interface and turn parallel port module converts done state inquiry; The SSI208P interface turns CLKMD0, the CLKMD1 of parallel port module and GRAY and connects respectively and draw resistance to draw high, and it is 2MHz that the SSI208P interface is turned parallel port module synchronised clock frequency allocation; The GRAY pin is drawn high, and the SSI208P interface turns the parallel port module Gray code data transfer of absolute value encoder output is become binary-coded decimal.The hardware circuit of other controller the like.If absolute value encoder surpasses 16, in like manner can realize being respectively equipped with on data separation PLC module and dsp processor a communication module with the another one address bit, wherein: communication module is 485 communication modules or CAN communication module.

It is fairly simple that the SSI208P interface turns startup conversion and control and the data read operation of parallel port module, and its flow process as shown in Figure 3.After recording the absolute value encoder position signal, dsp processor inside can calculate the motor actual speed by this position signal, can according to PLC module needs, regularly this position signal be uploaded to the PLC module by communication modes simultaneously.In like manner, required motor current signal also can pass to the PLC module by communication modes because variable pitch driver itself is detecting always.TMS320F2812 on variable pitch driver has 16 road AD ALT-CH alternate channels, removing variable pitch driver itself needs outside the signals such as current/voltage of detection, also remain some AD ALT-CH alternate channels, can pitch-controlled system some temperature detection signals of inside be input to respectively in each variable pitch driver and detect, only need to increase a corresponding signal conditioning circuit on control panel and get final product.The temperature signal that detects also can pass to the PLC module by communication modes, only needing to increase a communication module on the PLC module gets final product, and itself just be integrated with 485 communications, CAN communication function on dsp processor, and consider from data transfer rate, adopt the CAN communication more suitable.The data of communication can be divided into several classes according to its significance level, send can adopt timer interrupt mode with significant data, with requirement of real time; For the not high data of significance, can adopt the polling mode timed sending, timing cycle is decided according to PLC module demand.

The position signal of the absolute value encoder of the present embodiment itself just can be calculated the motor actual speed, and ratio of precision incremental encoder rate accuracy is higher; Variable pitch driver itself just detects current of electric in real time, in order to motor is carried out speed regulating control; The dsp processor that adopts on variable pitch driver has 16 road AD sampling channels, itself can gather the temperature signal that PT100 detects.Therefore the present embodiment utilizes the existing hardware condition, a lot of functions of PLC inside modules can realize in variable pitch driver, the information that the PLC module is required and data can be uploaded by the communication between variable pitch driver and PLC module, thereby can save a lot of modules of PLC module, and reduced line number between the rack plug, only need to increase communication module on the PLC module, make the PLC module be absorbed in the pitch-controlled system motion control, reduce PLC module working load, reduced the heating value of PLC module and the cost of whole pitch-controlled system.

The present invention still has numerous embodiments, and all employing equivalents or equivalent transformation and all technological schemes of forming are within all dropping on protection scope of the present invention.

Claims

1. pitch-controlled system cheaply, comprise the PLC module, absolute value encoder and variable pitch driver, it is characterized in that: described variable pitch driver is provided with dsp processor, the output terminal of described absolute value encoder is communicated with the input end of described dsp processor by the SSI interface, and the output terminal of described dsp processor is by the input end of communication modes and PLC module.

2. a kind of pitch-controlled system cheaply according to claim 1, it is characterized in that: described absolute value encoder is 16 absolute angle coders of individual pen, and the output data mode of described absolute value encoder is Gray code; Described dsp processor is TMS320F2812; Described SSI interface is that the SSI208P interface turns the parallel port module; The output terminal of described absolute value encoder is connected with the input end that described SSI208P interface turns the parallel port module; Eight bit data bus D0～D7 that described SSI208P interface turns the parallel port module is connected with low eight bit data bus XD0～XD7 of described TMS320F2812; Described TMS320F2812 /XZCS67 and described SSI208P interface turn the parallel port module /CS is connected; The universal I/O port GPIOB4 of described TMS320F2812 is connected with the START that described SSI208P interface turns the parallel port module; The universal I/O port GPIOB5 of described TMS320F2812 and described SSI208P interface turn parallel port module/END and are connected; Described SSI208P interface turns CLKMD0, the CLKMD1 of parallel port module and GRAY and connects respectively and draw resistance to draw high.

3. a kind of pitch-controlled system cheaply according to claim 1, is characterized in that: be respectively equipped with a communication module on described PLC module and described dsp processor.

4. a kind of pitch-controlled system cheaply according to claim 3, it is characterized in that: described communication module is 485 communication modules or CAN communication module.