CN201315486Y

CN201315486Y - Module for redundancy logical switch in direct current power transmission system

Info

Publication number: CN201315486Y
Application number: CNU2008201497261U
Authority: CN
Inventors: 杨敏; 黎小林; 李岩
Original assignee: XJ Electric Co Ltd; Power Grid Technology Research Center of China Southern Power Grid Co Ltd
Current assignee: China South Power Grid International Co ltd; XJ Electric Co Ltd
Priority date: 2008-10-15
Filing date: 2008-10-15
Publication date: 2009-09-23
Anticipated expiration: 2018-10-15

Abstract

The utility model relates to a module for a redundancy logical switch in a direct current power transmission system, which comprises two same circuit units. Each circuit unit comprises a pair of external AND circuits, two internal AND circuits, two OR circuits and an RS trigger. The third inputs of the internal AND circuits of the two circuit units are all connected with automatic operation signals; each input of the external AND circuit of each circuit unit is correspondingly connected with each monitoring signal of a control system; the output of the first internal AND circuit of each circuit unit is connected with one input end of one OR circuit; the output of the OR circuit corresponds to the R end of the RS trigger; the output of the second internal AND circuit of the circuit unit is connected with one input of the other OR circuit; the output of the OR circuit is connected with the S end of the RS trigger; the outputs of the two circuit units are connected in parallel; the other input of each OR circuit of the two circuit units is respectively connected with a conversion control signal; and the module is convenient to use due to the matching of the two circuit units, and has strong disturbance resisting capability as well as reliable and quick logical switch.

Description

A kind of module of in DC transmission system, carrying out the redundancy logic switching

Technical field

The utility model relates to a kind of direct current transportation and carries out the module that redundancy logic switches.

Background technology

All design according to the binary channels redundancy scheme in utmost point control system and the station control system in the existing DC transmission system, two passages of same time all are effectively, and can receive correct data from process.Yet, have only at one time a control system to allow the effectively current process of control, this operator scheme is called stand-by heat, requires under this pattern to lack very much switching time of controller (maximum several ms).

The utility model content

The purpose of this utility model is to provide a kind of module that redundancy logic switches of carrying out in DC transmission system, can carry out control signal redundancy logic handoff functionality automatically, if and a redundancy logic (RYLJ) module failure, a remaining module and corresponding control system thereof can automatically switch to effective operational mode, ensure the normal operation of control system.

The technical solution adopted in the utility model is: module of carrying out the redundancy logic switching in DC transmission system of the present utility model, this module contains two identical circuit units, each circuit unit contains an external AND circuit, two inner AND circuit, two OR circuit, a rest-set flip-flop circuit, the output of the external AND circuit of one of them circuit unit directly be connected into respectively inner AND circuit of this circuit unit and another circuit unit No. two inner AND circuit an input and respectively two not circuits by this circuit unit and another circuit unit be connected into an input of an inner AND circuit of No. two inner AND circuit of this circuit unit and another circuit unit; The output of the external AND circuit of another circuit unit directly be connected into respectively inner AND circuit of this circuit unit and another circuit unit No. two inner AND circuit another input and respectively two not circuits in addition by this circuit unit and another circuit unit be connected into an input of an inner AND circuit of No. two inner AND circuit of this circuit unit and another circuit unit; The 3rd input of the inside AND circuit of two circuit units all is connected with automatic operation signal end, each input of the external AND circuit of each circuit unit respectively with each monitor signal connection of a corresponding control system; The output of an inner AND circuit of each circuit unit is connected with an input of an OR circuit, the output of this OR circuit is connected into the R end of corresponding rest-set flip-flop circuit, the output of No. two inner AND circuit of this circuit unit is connected with an input of another OR circuit, the output of this OR circuit is connected into the S end of corresponding rest-set flip-flop circuit, and the output of two circuit units is connected in parallel; Another input of each OR circuit of two circuit units all is connected with changeover control signal

The beneficial effects of the utility model are: the RYLJ module is strong to the input antijamming capability of control signal, the control logic state is fast switching time, and have two RYLJ modules to be used when using, make RYLJ itself carry out redundant configuration, control logic is switched safety and reliability.

Description of drawings

Fig. 1 is the binary channels redundancy scheme in utmost point control system and the station control system in the DC transmission system of the present utility model;

Fig. 2 is a hardware principle block diagram of the present utility model;

Fig. 3 is the specific implementation circuit of resistance pressure-dividing network and anti-surge protection circuit;

Fig. 4 is the redundancy logic switching principle;

Fig. 5 is a schematic diagram of the present utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

All design according to the binary channels redundancy scheme in utmost point control system and the station control system in the existing as shown in Figure 1 DC transmission system, two passages of same time all are effectively, and can receive correct data from process.Yet, have only at one time a control system to allow the effectively current process of control, this operator scheme is called stand-by heat, requires under this pattern to lack very much switching time of controller (maximum several ms).

Redundancy logic (RYLJ) module designs in order to finish control signal redundancy logic handoff functionality in above-mentioned two systems, just can finish the redundant task switching that needs after must two RYLJ modules in the practical application cooperatively interacting, the exchanges data between two modules is to realize by the bus interface in the module.

The logic handoff functionality is realized that by programmable logic device software section uses the VHDL hardware description language to finish.Programmable logic device is selected the EPM3064 of ALTERA company for use.

The required power unit of module passes through 14,15 and No. 8 binding posts of binding post, connect the anode of the 24VDC power supply of two systems respectively, 24V1+, 24V2+ and GND, inside adds separates the power supply that DC24V is provided to module behind the even diode, and DC24V is transformed to the required 3.3V level of partial circuit in this module by a LDO linear power supply conversion module LM2675M-3.3.An input signal part is by bus B 6 and B7 splicing ear input as shown in Figure 2, a part is by 1～No. 7 binding post input, input signal is converted to the 24V level signal through resistance pressure-dividing network shown in Figure 2 and chip for driving and enters CPLD after the 3.3V level signal that programmable logic device needs and carry out logical process, the LED lamp that part signal drives front panel is simultaneously indicated the state of current demand signal, the signal that after CPLD carries out logical process, will export, by chip for driving is the 3.3V level translation by binding post 9～12 and No. 16 terminals output behind the 24V, and system's manual switchover button of module front panel, can give the upper strata control system by level signal of No. 13 binding post output after pressing this button, the request primary system switches.

RYLJ need carry out wiring by mode shown in Figure 4 when using, two modules toggle switch by inside is provided with holotype respectively and from pattern, the setting of toggle switch as shown in Figure 4, respectively from the power state signal (PS_OK) of two systems, hardware check signal (HW_OK), software self-test signal (SW_OK), VBE System self-test signal (VBE_OK) by binding post 1～4 access module, the handshaking between two modules is then finished by bus terminal; The status signal of module 1 and module 2 and logical validity signal (Active) are by the front-panel led indication, and logical validity signal (system active) and system's invalid signals (system passive) are by terminal 11 and 12 outputs.

Redundant module has two kinds of operator schemes: manual switchover and automatic switchover; The function that CPLD finished in two modules as shown in Figure 5, when pattern is set to automatic mode, AutomaticOperation Enalble signal shown in Figure 5 is a logical one, be in by dynamic system can by the button on the module produce handoff request and on deliver to the upper strata control system, the upper strata control system overturns two rest-set flip-flops in two modules by ChangeOver toOthers signal simultaneously, is dynamically switched dynamically to main thereby finish once.If current effective system breaks down; redundant module can automatically switch to back-up system; if this moment, back-up system also was a fault; redundancy logic (RYLJ) can produce an ESOF (emergency shutdown) order; when module is set to manual mode; Automatic Operation Enalble signal is a logical zero, and the active attitude of current system is dynamically forbidden switching, if this moment initiatively the attitude system redundant module that broken down can produce the ESOF signal and start trip operation one time.This mode of operation is suitable for the replacing and the maintenance of module, and the operator scheme of module shows that by top LED signal when module was manual mode, corresponding red LED lamp was lighted.

As can be seen from Figure 5, this module contains two identical circuit units, each circuit unit contains an external AND circuit, two inner AND circuit, two OR circuit, a rest-set flip-flop circuit, the output of the external AND circuit of one of them circuit unit directly be connected into respectively inner AND circuit of this circuit unit and another circuit unit No. two inner AND circuit an input and respectively two not circuits by this circuit unit and another circuit unit be connected into an input of an inner AND circuit of No. two inner AND circuit of this circuit unit and another circuit unit; The output of the external AND circuit of another circuit unit directly be connected into respectively inner AND circuit of this circuit unit and another circuit unit No. two inner AND circuit another input and respectively two not circuits in addition by this circuit unit and another circuit unit be connected into an input of an inner AND circuit of No. two inner AND circuit of this circuit unit and another circuit unit; The 3rd input of the inside AND circuit of two circuit units all is connected with automatic operation signal end, each input of the external AND circuit of each circuit unit respectively with each monitor signal connection of a corresponding control system; The output of an inner AND circuit of each circuit unit is connected with an input of an OR circuit, the output of this OR circuit is connected into the R end of corresponding rest-set flip-flop circuit, the output of No. two inner AND circuit of this circuit unit is connected with an input of another OR circuit, the output of this OR circuit is connected into the S end of corresponding rest-set flip-flop circuit, and the output of two circuit units is connected in parallel; Another input of each OR circuit of two circuit units all is connected with changeover control signal.

Module receives signal from control system and VBE system when all being high, and when two systems all are normal condition, signal A and B are low level, and this moment, rest-set flip-flop maintained the original state constant.Once system 1 breaks down and system 2 for normal condition is, signal B then is a high level, rest-set flip-flop will switch to system 2, these functions have been guaranteed to recover unnecessary switching can not to take place after normal when failure system.

Claims

1, a kind of module of in DC transmission system, carrying out the redundancy logic switching, it is characterized in that: this module contains two identical circuit units, each circuit unit contains an external AND circuit, two inner AND circuit, two OR circuit, a rest-set flip-flop circuit, the output of the external AND circuit of one of them circuit unit directly be connected into respectively inner AND circuit of this circuit unit and another circuit unit No. two inner AND circuit an input and respectively two not circuits by this circuit unit and another circuit unit be connected into an input of an inner AND circuit of No. two inner AND circuit of this circuit unit and another circuit unit; The output of the external AND circuit of another circuit unit directly be connected into respectively inner AND circuit of this circuit unit and another circuit unit No. two inner AND circuit another input and respectively two not circuits in addition by this circuit unit and another circuit unit be connected into an input of an inner AND circuit of No. two inner AND circuit of this circuit unit and another circuit unit; The 3rd input of the inside AND circuit of two circuit units all is connected with automatic operation signal end, each input of the external AND circuit of each circuit unit respectively with each monitor signal connection of a corresponding control system; The output of an inner AND circuit of each circuit unit is connected with an input of an OR circuit, the output of this OR circuit is connected into the R end of corresponding rest-set flip-flop circuit, the output of No. two inner AND circuit of this circuit unit is connected with an input of another OR circuit, the output of this OR circuit is connected into the S end of corresponding rest-set flip-flop circuit, and the output of two circuit units is connected in parallel; Another input of each OR circuit of two circuit units all is connected with changeover control signal.