阅读说明：本技术 一种励磁系统的脉冲出错处理方法 (Pulse error processing method for excitation system ) 是由 顾建嵘 朱红伟 单华鹏 彭钢 王斌 张绍峰 刘玉林 宋文渊 于 2020-05-27 设计创作，主要内容包括：本发明公开了一种励磁系统的脉冲出错处理方法,励磁系统中每个功率整流单元的每个支路均采用独立的脉冲回路,在控制逻辑上将n个并联的功率整流单元视为n个+A支路、n个+B支路、n个+C支路、n个-A支路、n个-B支路、n个-C支路并联运行,总计6*n个支路。由励磁调节装置监测所有并联运行的功率整流单元每一相支路的触发脉冲的状态,当脉冲信号丢失时,开出对应的脉冲出错信号并切除对应脉冲出错的支路脉冲,只要满足机组的最低运行则不需要切除励磁系统,提高了励磁系统冗余容错程度,进而提高了发电机运行的稳定性和可靠性。(The invention discloses a pulse error processing method of an excitation system, wherein each branch of each power rectification unit in the excitation system adopts an independent pulse loop, and n parallel power rectification units are regarded as n + A branches, n + B branches, n + C branches, n-A branches, n-B branches and n-C branches to run in parallel on control logic, and the total number of the branches is 6 x n. The excitation adjusting device monitors the state of the trigger pulse of each phase of branch of all the power rectifying units running in parallel, when the pulse signal is lost, the corresponding pulse error signal is sent out and the branch pulse corresponding to the pulse error is cut off, the excitation system does not need to be cut off as long as the minimum running of the unit is met, the redundancy fault tolerance degree of the excitation system is improved, and the running stability and reliability of the generator are further improved.)

1. A pulse error processing method of an excitation system is characterized by comprising the following steps:

a pulse module of the excitation adjusting device sends pulse signals to all branches of all power rectifying units, and pulse signal loops of all branches of all power rectifying units are monitored;

when the read-back pulse of a certain branch is monitored to be in error, a pulse error warning signal is sent out, and only the power rectifying unit branch in which the read-back pulse is in error is cut off;

the excitation adjusting device counts the number of branches of each phase of the power rectifying unit which normally runs in real time;

and performing excitation system cutting plan based on the number of branches of each phase of the power rectifying unit which normally operates.

2. The pulse error processing method of the excitation system according to claim 1, wherein each branch of each power rectifying unit is independently configured with a pulse receiving circuit and a read-back circuit to form a pulse signal loop.

3. The method for processing the pulse error of the excitation system according to claim 2, wherein the pulse module of the excitation adjusting device sends pulse signals to all branches of the power rectifying units, and the method comprises the following steps:

a pulse module of the excitation adjusting device sends n groups of pulse signals to a power rectifying unit, and each group of pulse signals comprises six branch signals including + A phase, + B phase, + C phase, -A phase, -B phase and-C phase;

each power rectifying unit receives a group of pulse signals, and a pulse receiving circuit of each branch of the power rectifying unit receives the pulse signals of the corresponding phase and returns the signals to a pulse module of the excitation adjusting device through a readback circuit;

and n is the number of power rectifying units in the excitation system.

4. The pulse error processing method of the excitation system according to claim 3, wherein the excitation adjusting device counts the number of branches per phase of the normally operating power rectifying unit in real time, and comprises:

and the excitation adjusting device respectively counts the number of each phase branch which is not cut off in all the power rectifying units:

the number of + A phase branches which are not cut in all the power rectifying units is recorded as a, the number of + B phase branches which are not cut in all the power rectifying units is recorded as B, the number of + C phase branches which are not cut in all the power rectifying units is recorded as C, the number of-A phase branches which are not cut in all the power rectifying units is recorded as x, the number of-B phase branches which are not cut in all the power rectifying units is recorded as y, and the number of-C phase branches which are not cut in all the power rectifying units is recorded as z.

5. The pulse error processing method of the excitation system according to claim 4, wherein the performing of the excitation system cut-off plan based on the number of branches per phase of the normally operating power rectifying unit comprises:

if min { a, b, c, x, y, z }, is more than or equal to m, the excitation system is not cut off, otherwise, the excitation system is cut off;

and the step of calculating the maximum power of the unit, wherein min {. is the minimum value in a group of returned values, and m is the number of power rectifying units required by the minimum operation of the unit.

6. The pulse error processing method of the excitation system according to claim 5, wherein the value of m is:

m=n-1。

Technical Field

The invention discloses a pulse error processing method of an excitation system, and belongs to the technical field of generator excitation systems.

Background

In the conventional static excitation system, an excitation adjusting device samples a synchronous signal of an excitation power supply, a trigger pulse signal for controlling a power rectifying unit to work is sent out based on the synchronous signal, and the output voltage of the power rectifying unit is changed to adjust the excitation current of a generator so as to meet the running requirement of a unit.

In the operation process of the excitation system, the pulse module controlled by the excitation adjusting device can read back and judge the sent pulse signal, and when the pulse signal is lost or the deviation between the read back angle and the sent angle is too large, a corresponding pulse error signal is sent out, and corresponding error processing is carried out, as shown in fig. 1.

There are two main technical solutions for monitoring the trigger pulse loop: 1. as shown in fig. 2 (taking 2 power rectification units as an example), the trigger pulse signals of all the power rectification units are connected in parallel, and are taken from the same group of pulse signals, and the excitation regulating device monitors the emitted pulse signals; the defect is that when a trigger pulse loop of a certain power rectifying unit is disconnected, the excitation regulating device cannot judge whether a fault exists from the device side, and no signal of pulse error is sent out, so that the hidden danger of accident expansion exists. 2. As shown in fig. 3 (taking 2 power rectification units as an example), each power rectification unit is provided with an independent intelligent control module, the excitation adjusting device controls the intelligent control module of the power rectification unit to perform trigger control through a communication bus, and the intelligent control module is responsible for monitoring a trigger pulse loop of the power rectification unit; when the intelligent control module detects that a trigger pulse loop of the power rectifying unit is abnormal, a pulse error signal is reported and pulse output is blocked, and faults are controlled in a single power rectifying unit until the number of the power rectifying units which are kept in operation does not meet the minimum operation requirement of the unit, and the excitation system quits operation. The excitation system has the disadvantages of complex system and high cost, and compared with the conventional excitation system, the excitation system is additionally provided with a communication bus and a control module of a power rectification unit; the mechanism for processing the pulse error is imperfect, the pulse control cutting logic which is integrated by a single power rectifying unit is general, and the internal branch is not further refined.

Disclosure of Invention

In order to solve the problem of incomplete mechanism of pulse error processing in the existing excitation system, the invention provides a pulse error processing method of the excitation system, an excitation adjusting device monitors the state of trigger pulses of each phase branch of all power rectifying units which run in parallel, when pulse signals are lost, corresponding pulse error signals are opened and corresponding branch pulses with pulse errors are cut off, the excitation system does not need to be cut off as long as the lowest running of a unit is met, the redundant fault tolerance degree of the excitation system is improved, and the running stability and reliability of a generator are further improved.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a pulse error processing method of an excitation system comprises the following steps:

a pulse module of the excitation adjusting device sends pulse signals to all branches of all power rectifying units, and pulse signal loops of all branches of all power rectifying units are monitored;

when the read-back pulse of a certain branch is monitored to be in error, a pulse error warning signal is sent out, and only the power rectifying unit branch in which the read-back pulse is in error is cut off;

the excitation adjusting device counts the number of branches of each phase of the power rectifying unit which normally runs in real time;

and performing excitation system cutting plan based on the number of branches of each phase of the power rectifying unit which normally operates.

Furthermore, each branch of each power rectifying unit is independently provided with a pulse receiving circuit and a read-back circuit to form a pulse signal loop.

Further, the pulse module of the excitation adjusting device sends a pulse signal to each branch of all power rectifying units, and the method includes:

a pulse module of the excitation adjusting device sends n groups of pulse signals to a power rectifying unit, and each group of pulse signals comprises six branch signals including + A phase, + B phase, + C phase, -A phase, -B phase and-C phase;

each power rectifying unit receives a group of pulse signals, and a pulse receiving circuit of each branch of the power rectifying unit receives the pulse signals of the corresponding phase and returns the signals to a pulse module of the excitation adjusting device through a readback circuit;

and n is the number of power rectifying units in the excitation system.

Further, the real-time statistics of the number of branches of each phase of the power rectification unit which normally operates by the excitation adjusting device includes:

and the excitation adjusting device respectively counts the number of each phase branch which is not cut off in all the power rectifying units:

the number of + A phase branches which are not cut in all the power rectifying units is recorded as a, the number of + B phase branches which are not cut in all the power rectifying units is recorded as B, the number of + C phase branches which are not cut in all the power rectifying units is recorded as C, the number of-A phase branches which are not cut in all the power rectifying units is recorded as x, the number of-B phase branches which are not cut in all the power rectifying units is recorded as y, and the number of-C phase branches which are not cut in all the power rectifying units is recorded as z.

Further, the performing an excitation system removal plan based on the number of branches of each phase of the normally operating power rectification unit includes:

if min { a, b, c, x, y, z }, is more than or equal to m, the excitation system is not cut off, otherwise, the excitation system is cut off;

and the step of calculating the maximum power of the unit, wherein min {. is the minimum value in a group of returned values, and m is the number of power rectifying units required by the minimum operation of the unit.

Further, the value of m is as follows:

m=n-1。

the invention has the beneficial effects that:

by adopting the pulse error processing method of the excitation system, n parallel power rectification units are regarded as n + A branches, n + B branches, n + C branches, n-A branches, n-B branches and n-C branches to run in parallel on control logic, and 6n branches are calculated in total; when the pulse is in error, the excitation adjusting device only cuts off the corresponding branch pulse, and the excitation system does not need to be cut off as long as the lowest operation of the unit is met, so that the redundancy fault tolerance degree of the excitation system is improved, and the operation stability and reliability of the generator are further improved.

Drawings

Fig. 1 is an example of an excitation adjusting device;

fig. 2 is an example of processing a pulse loop signal by an excitation adjusting device in the first technical solution;

fig. 3 is an example of processing a pulse loop signal by an excitation adjusting device in a second technical solution;

FIG. 4 is an example of a power rectifying unit;

FIG. 5 illustrates an example of parallel operation of multiple power rectification units in an excitation system;

FIG. 6 is an example of the pulse loop signal processing of the excitation adjusting device according to the present invention;

fig. 7 is a flow chart of a pulse error processing method of the excitation system of the invention.

Detailed Description

The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 4, most of the conventional excitation system power rectification units are three-phase fully-controlled rectifier bridges, that is, each power rectification unit is composed of 6 controllable silicon, and has six branches of + a, + B, + C, -a, -B, and-C, and rectifies a three-phase alternating-current excitation power supply into a direct current, applies the direct current to a rotor winding of a generator,

as the capacity of the genset increases, the capacity of a single power rectification unit is insufficient to meet the actual operational needs, and configurations have emerged in which multiple power rectification units operate in parallel. At present, the power rectifying units connected with the excitation system in parallel generally have at least one redundant (n-1) configuration, and the meaning of (n-1) is that after the fault of one power rectifying unit is removed, the system can still meet the operation requirements of all working conditions including forced excitation. Taking 2 power rectification units as an example, when 1 power rectification unit is cut off, the remaining 1 power rectification unit can meet the operation requirements of all working conditions including forced excitation, as shown in fig. 5.

The pulse error processing method of the excitation system provided by the invention abandons the traditional pulse control cutting logic which takes a single power rectifying unit as a whole.

As shown in fig. 6 (taking 2 power rectifying units as an example, n =2, m = n-1= 1):

in the invention, each branch of each power rectifying unit is independently provided with a pulse receiving circuit and a read-back circuit to form a pulse signal loop.

The pulse module of the excitation adjusting device sends pulse signals to all branches of the power rectifying units, namely:

a pulse module of the excitation adjusting device sends n groups of pulse signals to a power rectifying unit, and each group of pulse signals comprises six branch signals including + A phase, + B phase, + C phase, -A phase, -B phase and-C phase;

each power rectifying unit receives a group of pulse signals, and the pulse receiving circuit of each branch of the power rectifying unit receives the pulse signals of the corresponding phase and returns the signals to the pulse module of the excitation adjusting device through the readback circuit.

Based on the scheme, the control logic of the excitation regulating device considers n parallel power rectifying units as n + A branches, n + B branches, n + C branches, n-A branches, n-B branches and n-C branches to operate in parallel, and the total number of the branches is 6 x n.

The invention only sends out a group of pulse signals (6 paths including + A, + B, + C, -A, -B and C branches) to the outside by a pulse module of the original excitation adjusting device, and all power rectifying unit control pulses are connected in parallel and are taken from the group of pulses; instead, the pulse module sends out n groups of 6n pulse signals (6 n paths including n + A, n + B, n + C, n-A, n-B, n-C paths) to the outside, and the pulse loop of each path is processed independently.

When the pulse is lost, the excitation adjusting device only cuts off the corresponding branch pulse, and the excitation adjusting device monitors and counts the number of branches which normally run (are not cut off) in the running process of the unit in real time: the operation number a of the branch circuit + A, the operation number B of the branch circuit + B, the operation number C of the branch circuit + C, the operation number x of the branch circuit A, the operation number y of the branch circuit B and the operation number z of the branch circuit C.

If min { a, b, c, x, y, z }, is more than or equal to m, the excitation system is not cut off, the redundant fault tolerance degree of the excitation system is improved, and the running stability and reliability of the generator are further improved.

The min function is the minimum value in a set of values returned, and m is the number of power rectifying units required by the minimum operation of the unit.

Referring to fig. 7, the method for processing a pulse error of an excitation system of the present invention includes:

the excitation regulating device monitors and counts pulse signal loops of all power rectifying units running in parallel in the running process of the unit, and the n power rectifying units running in parallel are regarded as n + A branches, n + B branches, n + C branches, n-A branches, n-B branches and n-C branches to run in parallel on control logic, and 6n branches are counted;

when the excitation regulating device monitors that the pulse is wrong, a pulse error warning signal is sent out, and only the power rectifying unit branch with the current pulse error is cut off;

the excitation adjusting device monitors and counts the number of branches which normally run in the running process of the unit in real time: the running number of the branch A is recorded as a, the running number of the branch B is recorded as B, the running number of the branch C is recorded as C, the running number of the branch A is recorded as x, the running number of the branch B is recorded as y, and the running number of the branch C is recorded as z; if min { a, b, c, x, y, z } > is more than or equal to m, the excitation system is not cut off.