CN104464247A

CN104464247A - Method for reducing time synchronization error of public network of concentrator

Info

Publication number: CN104464247A
Application number: CN201410768022.2A
Authority: CN
Inventors: 张林桥; 王大兴; 向坤山
Original assignee: WUHAN ZHONGYUAN ELECTRONIC INFORMATION Corp
Current assignee: WUHAN ZHONGYUAN ELECTRONIC INFORMATION Corp
Priority date: 2014-12-12
Filing date: 2014-12-12
Publication date: 2015-03-25
Anticipated expiration: 2034-12-12
Also published as: CN104464247B

Abstract

The invention discloses a method for reducing the time synchronization error of a public network of a concentrator. The method comprises the following steps: the concentrator packs current moment to a heartbeat frame which is sent to a main computer; the heartbeat frame received by the main computer is fed back to the concentrator; the concentrator calculates a difference value of moments when the same heartbeat frame is sent and received; if the difference value is less than or equal to a threshold value, the difference value is put in a time delay queue and if an interpolation value is greater than the threshold value, the difference value is abandoned, the average value of each queue unit in the time delay queue is calculated and half of the average value is taken as compensation time; a master station packs current main computer time to a time synchronization command and the time synchronization command is sent to the concentrator; and after the concentrator receives the time synchronization command of the master station, the compensation time added with the main computer time in the time synchronization command is taken as standard time and a clock of the concentrator is corrected based on the standard time. The time synchronization error of the public network of the concentrator provided by the invention is shortened to be within 1 secondfrom originally 4-5 seconds. The concentrator provides a relatively precise clock synchronization source for remote timing of an intelligent electric meter, and the implementation method is simple and effective.

Description

A kind ofly reduce the method for concentrator public network to time error

Technical field

The present invention relates to power information and gather field, be specifically related to a kind ofly reduce the method for concentrator public network to time error.

Background technology

Along with the popularization of centralized meter-reading system, concentrator use amount is increasing, and the clock synchronous of electricity consumption acquisition system is the basis of whole system.Main website is generally configured with gps clock synchro system, effectively can ensure the clocking error of master device; Although concentrator have employed hardware clock circuit, can meet and walk time error and control at 0.5 second, main website carries out constantly by wireless public network to concentrator, and the number existed due to public network communication passes time delay, causes the clock of concentrator cannot be synchronous with master device.

Along with the propelling that intelligent grid is built, require that concentrator is calibrated administered intelligent electric meter, carry out line loss calculation and statistical study according to ammeter freezing data at zero point.But owing to being exactly the real-time clock of concentrator to reference clock during ammeter school, this causes ammeter clock reference to calibrate.

In centralized meter-reading system, concentrator sends heartbeat frame according to eartbeat interval timing to main website, after main website receives heartbeat frame, sends acknowledgement frame, to acknowledge receipt of heartbeat frame immediately to concentrator.Concentrator and main website keep being connected by this heartbeat mechanism exactly.

Summary of the invention

The object of the invention is to be the problems referred to above existed for prior art, provide and a kind ofly reduce the method for concentrator public network to time error, the actual clocking error between concentrator and main website server can be effectively reduced, can control within 1 second.

In order to realize above-mentioned object, the present invention by the following technical solutions:

A kind ofly reduce the method for concentrator public network to time error:

Comprise the following steps,

Make-up time measuring process:

Heartbeat frame is sent to main frame after current time T1 being bundled to heartbeat frame according to predetermined eartbeat interval by step 1.1, concentrator;

Heartbeat frame is fed back to concentrator after receiving the heartbeat frame of concentrator transmission by step 1.2, main frame;

After step 1.3, concentrator receive the heartbeat frame of main frame feedback, record receives the moment T2 of the heartbeat frame of main frame feedback;

Step 1.4, concentrator calculate the difference u of the moment T1 of moment T2 that same heartbeat frame receives and transmission, if difference u is less than or equal to predetermined threshold time, then by difference u stored in time delay queue, and the mean value X1 of each queue unit of calculation delay queue; If difference u is greater than predetermined threshold time, then not stored in time delay queue; Using the half of mean value X1 as the make-up time;

Pair time step:

Concentrator is sent in order when current host time is bundled to pair by step 2.1, main website;

When step 2.2, concentrator receive main website pair after order, using pair time order in host time add that the make-up time is as the standard time, and revise concentrator clock with the standard time.

The First Input First Output of time delay queue as above to be queue unit number be n, the make-up time wherein ui is i-th queue unit in time delay queue.

The present invention compared with prior art, has the following advantages:

1, after adopting this conceptual design during long-range pair of wireless public network concentrator of the present invention, the public network of concentrator has been reduced within 1 second from original 4 ~ 5 seconds time error.

2, provide clock synchronous source more accurately when the present invention is concentrator school long-range to intelligent electric meter, and implementation method is simply effective.

Accompanying drawing explanation

Fig. 1 is schematic flow sheet of the present invention.

Fig. 2 is the signal wiring schematic diagram that the present invention relates to.

Fig. 3 is communication flow schematic diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail.

Embodiment 1

Example is described in further detail patent of the present invention by reference to the accompanying drawings:

According to Fig. 2, comprise the electricity consumption acquisition system of concentrator, comprise main website, wireless public network, concentrator, electric energy meter etc.For the electricity consumption acquisition system of Jiangsu actual motion, whole system is made up of Jiangsu Power Company electricity consumption collection main station system, mobile GPRS network, Wuhan Zhongyuan Electronic Information Company DJGZ23-ZY93Z type concentrator, Weisheng, Changsha DDS102 type carrier electric energy meter.Freezing data preserving at zero point in DJGZ23-ZY93Z concentrator copy reading ammeter, waits for that main website recruits and surveys; When DJGZ23-ZY93Z type concentrator 2:00 every day timing to be carried out pair all ammeters of subordinate, pair time order in clock use the clock of concentrator.

Reduce the method for concentrator public network to time error,

Comprise the following steps,

Make-up time measuring process:

Heartbeat frame is sent to main frame after current time T1 being bundled to heartbeat frame according to predetermined eartbeat interval (being 5 minutes in the present embodiment) by step 1.1, concentrator;

Step 1.4, concentrator calculate the difference u of the moment T1 of moment T2 that same heartbeat frame receives and transmission, if interpolation u is less than or equal to predetermined threshold time (threshold time predetermined in the present embodiment is set as 15 seconds), then by interpolation u stored in time delay queue, and the mean value X1 of each queue unit of calculation delay queue; If interpolation u is greater than predetermined threshold time, then not stored in time delay queue; And using the half of mean value X1 as the make-up time;

Pair time step:

The First Input First Output of time delay queue to be queue unit be n (n is the number of heartbeat in 12 hours, n=144 in the present embodiment), the make-up time

The concentrator of multiple stage difference numbering is chosen at scene, measures the actual error of concentrator and gps clock when not using of the present invention, chooses wherein effective error, as following table 1.

Actual error table when table 1 does not use concentrator during the present invention couple to carry out pair

Numbering	Error (ms)	Numbering	Error (ms)	Numbering	Error (ms)	Numbering	Error (ms)
								1	4990	26	4360	51	5720	76	4510
2	4540	27	3980	52	4870	77	4650
								3	5100	28	4680	53	4900	78	4490
4	4870	29	5210	54	4680	79	4640
								5	5030	30	4430	55	4280	80	4570
6	4720	31	4500	56	4420	81	4530
								7	4360	32	4450	57	4390	82	4870
8	4450	33	4680	58	4630	83	4460
								9	4870	34	4270	59	4550	84	4560
10	4610	35	4330	60	4600	85	4440
								11	4580	36	4720	61	4560	86	4570
12	4600	37	4430	62	4370	87	4600
								13	4680	38	4540	63	4460	88	4410
14	4610	39	4530	64	4680	89	4690
								15	4480	40	4490	65	4870	90	4540
16	4550	41	4870	66	4480	91	4420
								17	4390	42	4620	67	5070	92	4910
18	4550	43	4430	68	4630	93	4680
								19	4690	44	5110	69	4550	94	4570
20	4480	45	4710	70	4640	95	4460
								21	4540	46	4930	71	4530	96	4640
22	4870	47	4560	72	4670	97	4800
								23	4530	48	4480	73	4530	98	4620
24	4470	49	4730	74	4640	99	4720
								25	4530	50	4420	75	4540	100	4630

Use the present invention, wait for that concentrator runs 24 hours, measure the actual error between concentrator and gps clock, see the following form 2:

Actual error table when table 2 uses concentrator during the present invention couple to carry out pair

Numbering	Error (ms)	Numbering	Error (ms)	Numbering	Error (ms)	Numbering	Error (ms)
								1	320	26	340	51	410	76	390
2	170	27	260	52	350	77	420
								3	510	28	320	53	240	78	230
4	380	29	550	54	390	79	190
								5	440	30	390	55	310	80	730
6	390	31	260	56	420	81	250
								7	270	32	310	57	430	82	400
8	330	33	280	58	330	83	540
								9	650	34	160	59	350	84	360
10	520	35	330	60	260	85	440
								11	260	36	630	61	410	86	540
12	300	37	340	62	430	87	390
								13	470	38	250	63	300	88	260
14	370	39	370	64	640	89	480
								15	230	40	390	65	330	90	450
16	360	41	290	66	450	91	320
								17	400	42	130	67	570	92	390
18	670	43	360	68	460	93	260
								19	340	44	400	69	350	94	330
20	490	45	380	70	610	95	400
								21	410	46	640	71	570	96	390
22	450	47	340	72	510	97	330
								23	390	48	440	73	290	98	480
24	780	49	310	74	410	99	680
								25	470	50	530	75	350	100	370

The present invention effectively can reduce concentrator wireless public network to time error, improves the accuracy of clock of power meter,

Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.

Claims

1. reduce the method for concentrator public network to time error, it is characterized in that:

Comprise the following steps,

Make-up time measuring process:

Pair time step:

2. according to claim 1ly a kind ofly reduce the method for concentrator public network to time error, it is characterized in that, the First Input First Output of described time delay queue to be queue unit number be n, make-up time wherein ui is i-th queue unit in time delay queue.