CN101907685A - Method for checking correctness of operating parameters of generator set capable of adapting to change of operating conditions - Google Patents

Abstract

The invention discloses a method for checking the correctness of operating parameters of a generator set capable of adapting to the change of operating conditions, which belongs to the technical field of the operation monitoring of generator sets. The method comprises the following steps of: dividing the operating conditions of the generator set, determining the operating conditions through three parameters, namely set load, environmental temperature and heat productivity of coal as fired to make into an operating parameter condition value table, and upgrading the operating condition value table according to the actual operating conditions and operating parameter real-time values in the stable state of the generator set, so that each parameter operating condition value changes with the operating conditions; checking the correctness of the operating parameters by utilizing the operating condition value table, so that the process of checking the correctness of the operating parameters of the generator set has the adaptive capability on the operating conditions; and providing replacement values in high accuracy during parametric fault.

Description

Adapt to the genset operational factor verifying correctness method that operating condition changes

Technical field

The invention belongs to genset operational monitoring technical field, particularly a kind of genset operational factor verifying correctness method that adapts to the operating condition variation.

Background technology

The parameter that Generator Set need be monitored is a lot, as nearly 6000～8000 of typical 600MW unit process monitoring parameters.Some directly comes from the original detection data of spot sensor monitoring parameter, and as temperature, pressure etc., also some is the secondary calculating result of original detection data, as working medium enthalpy, various efficient etc.Utilize monitoring parameter further to realize: whether 1) operating states of the units monitors, normal as unit operation, and alarm free etc. is arranged; 2) unit operation performance evaluation is as economy, stability, the calculating of feature of environmental protection index and analysis etc.; 3) control automatically is as making controlled parameter tracking desired value by adjusting topworks's output.Therefore the correctness of guaranteeing monitoring parameter is to realize the prerequisite of genset safety, stable, economical operation.The unpredictable actual value that departs from of monitoring parameter may cause: 1) false alarm causes operation personnel operation error on duty; 2) the performance computation result is inaccurate, reduces unit economy; 3) the automatic control system adjusting is malfunctioning, causes security incident.The reason that causes monitoring parameter to depart from actual value mainly contains: 1) sensor fault; 2) loosening, the dust stratification of mounting points, corrosion etc.; 3) signals transmission electromagnetic interference (EMI); 4) secondary calculating calculation of parameter condition changes, and still calculates enthalpy etc. by the dry steam condition when having entered wet-steam region as working medium reality.The important operational factor of genset will be carried out verifying correctness before use.

The method of inspection that adopts mainly contains at present:

(1) based on the method for inspection of sensor continuity test, enter scattered control system (DCS) afterwards at signal, carry out the sensor continuity test by the quality judge module, its principle is: generally speaking, sensor is output as the 4-20mADC current signal, and when sensor broke, DCS received the 0mA signal, can be judged as bad quality of signal, provide warning and pass to the respective handling logic.

(2) based on the method for inspection of parameter bound and rate of change.Provide some parameter possible bound and maximum rate of change in whole service operating mode scope, be in outside the bound or actual rate of change during, provide and report to the police and pass to the respective handling logic greater than maximum rate of change when detecting actual parameter value.

(3) based on the method for inspection of signal redundancy.For important parameter a plurality of measuring points are installed simultaneously, or are constituted redundantly by soft computing method, the deviation between the redundant signals is relatively represented signal fault when absolute value of the bias during greater than given threshold value, provides to report to the police and pass to the respective handling logic.

(4) based on the method for inspection of parameter reference value.Some parameters fluctuate near a certain reference value, and this reference value may be design load or the design load of revising by load.When detecting actual parameter value and reference value deviation, provide warning and pass to the respective handling logic above given threshold value.

In the above-mentioned method of inspection, be applicable to that catastrophic failure detects, but testing accuracy are low, and do not provide possible parameter substitution value simply fast in method (1), (2); Method (3) testing accuracy is high and can provide possible parameter substitution value, but needs extra hardware, software support, and the implementation cost height can not be applied to all parameters; Method (4) has certain precision and can provide possible parameter substitution value, but is difficult to find the reference value of all parameters, and reference value is constant or has fixed relationship with load, can not upgrade with actual condition, so can only implement at individual parameters.

Summary of the invention

The purpose of this invention is to provide a kind of genset operational factor verifying correctness method that operating condition changes that adapts to, it is characterized in that, comprising:

(1) the genset operating condition is divided

At first genset is treated as an autonomous system, the current state of living in of genset is described by external parameter and inner parameter, external parameter is system and extraneous getting in touch, influenced by external factor, be unmodifiable, the environment temperature of going into the stove ature of coal, changing with the current weather situation that typical external parameter has the unit load that changes with the dispatching of power netwoks instruction, changes with current burning coal; Inner parameter is a unit externally under the restriction on the parameters, to the description of each link operation conditions of internal system, comprises power pressure, temperature, flow and enthalpy; Should satisfy mass balance, energy equilibrium, these specific moving laws of momentum balance between the internal parameters, as seen, inner parameter changes with the variation of external parameter and system architecture, for the unit that has put into operation, system architecture is determined, so inner parameter only changes with external parameter;

The combination of external parameter is defined as operating condition, so each external parameter combination is with regard to corresponding a kind of operating condition; Can run into different external parameter combinations in the actual moving process, also just form multiple operating condition.

With unit load P, environment temperature T and go into three external parameters of stove calorific value of coal Q and determine operating condition, the span of establishing three external parameters is respectively Pmin-Pmax, Tmin-Tmax and Qmin-Qmax, the discrete respectively N that turns to _p, N _r, N _qIndividual interval is called segments, and then three external parameter i section corresponding parameters spans are respectively

Unit load P:

$\frac{P_{\max }-P_{\min }}{N_P}\&CenterDot;i\&le;P<\frac{P_{\max }-P_{\min }}{N_P}\&CenterDot;(i+1),i=\mathrm{0,1},\mathrm{\&Lambda;},N_P-1---\left(1\right)$

Environment temperature T:

$\frac{T_{\max }-T_{\min }}{N_T}\&CenterDot;i\&le;T<\frac{T_{\max }-T_{\min }}{N_T}\&CenterDot;(i+1),i=\mathrm{0,1},\mathrm{\&Lambda;},N_T-1---\left(2\right)$

Go into stove calorific value of coal Q:

$\frac{Q_{\max }-Q_{\min }}{N_Q}\&CenterDot;i\&le;Q<\frac{Q_{\max }-Q_{\min }}{N_Q}\&CenterDot;(i+1),i=\mathrm{0,1},\mathrm{\&Lambda;},N_Q-1---\left(3\right)$

Above-mentioned three external parameters by the fragment number combination, can be obtained N _p* N _r* N _qIndividual unit operation operating mode, each operating mode definition is as shown in table 1.

Table 1 operating condition is divided and operational factor operating mode value

Operating mode number	The unit load segment number	The environment temperature segment number	The calorific value of coal segment number	Main steam pressure	Boiler efficiency
							0	0	0	0	18.0	92.0	……
1	0	0	1	18.1	92.1	……

2	0	0	2	18.2	92.2	……
							3	0	0	3	18.3	92.2	……
4	0	0	4	18.4	92.3	……
							5	0	1	0	18.0	92.3	……
……	……	……	……	……	……	……
							N P×N T×N Q-1	N P-1	N T-1	N Q-1	19.0	93.0	……

So far, unit external parameter combination and operating condition number are mapped.

(2) the operational factor operating mode value calculating method of adaptation condition variation

Under a certain definite operating mode, the unit operation parameter all has a theoretical reference value because it changes with actual condition, still be referred to as operational factor operating mode value.Because genset is too complicated, it is unpractical that attempt obtains all operational factor operating mode values by the Analysis on Mechanism method, provides a kind of method of asking for operational factor operating mode value by data statistics here.

Operational factor operating mode value calculation process:

(a) set steady judgement

Be used to judge whether unit is in steady state (SS), only under steady state (SS), just carry out the operating mode value and calculate that the thinking of set steady judgement is that unit load and main steam pressure variable quantity in a period of time are specially all less than given threshold value:

Unit actual load variable quantity is less than δ in the duration Δ _w, and

Unit main steam pressure variable quantity is less than δ in the duration Δ _P

Wherein δ W is a load variations threshold setting value, and δ p is a main steam pressure change threshold setting value.

(b) obtain unit actual condition number

According to current unit load, environment temperature and calorific value of coal value, calculate for people's formula (1)-(3), from table 1, check in unit actual condition number;

(c) renewal of operational factor

Utilize under the current working in the operational factor actual value his-and-hers watches 1 the operational factor operating mode value under the corresponding operating mode to upgrade.Update method has two kinds: the one, substitute the operating mode value with actual value; The 2nd, with the alternative operating mode value of the weighted sum of actual value and operating mode value;

(3) the operational factor verifying correctness method of adaptation condition variation

Through above-mentioned (1), after (2) step, set up the operating condition corresponding parameter condition value table shown in the table 1, all to carry out the parameter verifying correctness before each utilization and operation parameter, inspection process is as follows:

(a) obtain current working number

According to current unit load, environment temperature and calorific value of coal value, calculate for people's formula (1)-(3), from table 1, check in unit actual condition number;

(b) obtain parameter operating mode value

From the duty parameter table, obtain each parameter operating mode value of operating mode correspondence.

(c) parameter verifying correctness algorithm

Be example with the main steam pressure still, establish that measured parameter value is P under the current working, the operating mode value is P ₀, then given zoom factor a:0≤a≤1, carry out verifying correctness by following algorithm:

$\frac{P_0}{1+a}\&le;P\&le;P_0(1+a)---\left(4\right)$

When satisfying formula (4), it is correct then to be judged as parameter, otherwise is judged as abnormal parameters.

(4) replacement of operational factor under the abnormal conditions

When judging abnormal parameters, will replace actual value with the operating mode value, and in subsequent applications, provide prompting;

As described above, when formula (4) when not satisfying, illustrate that measured parameter value P is away from operating mode value P ₀, think that measured parameter value P breaks down, and then carry out parameter and replace, promptly with operating mode value alternative parameter value:

P＝P ₀

The invention has the beneficial effects as follows to provide a kind of reference value (being called the operating mode value here) computing method that operating condition changes that adapt to, and realize the generator 's parameter verifying correctness, be characterized in: can carry out verifying correctness all parameters according to the operating mode value; Operating condition had adaptive ability; High precision provides its substitution value during parametic fault.

Description of drawings

Fig. 1 operational factor operating mode value is new technological process more

Fig. 2 operational factor verifying correctness flow process

Embodiment

The invention provides a kind of genset operational factor verifying correctness method that operating condition changes that adapts to, at first the genset operating condition is divided, genset is treated as an autonomous system, the current state of living in of genset is described by external parameter and inner parameter, external parameter is system and extraneous getting in touch, influenced by external factor, be unmodifiable, the environment temperature of going into the stove ature of coal, changing with the current weather situation that typical external parameter has the unit load that changes with the dispatching of power netwoks instruction, changes with current burning coal; Inner parameter is a unit externally under the restriction on the parameters, to the description of each link operation conditions of internal system, comprises power pressure, temperature, flow and enthalpy; Should satisfy mass balance, energy equilibrium, these specific moving laws of momentum balance between the internal parameters, as seen, inner parameter changes with the variation of external parameter and system architecture, for the unit that has put into operation, system architecture is determined, so inner parameter only changes with external parameter;

The combination of external parameter is defined as operating condition, so each external parameter combination is with regard to corresponding a kind of operating condition; Can run into different external parameter combinations in the actual moving process, also just form multiple operating condition.

With unit load P, environment temperature T and go into three external parameters of stove calorific value of coal Q and determine operating condition, calculate according to above-mentioned formula (1)-(3), obtain the operating mode shown in the operational factor condition value table 1 number;

(2) the operational factor operating mode value calculating method of adaptation condition variation, operational factor operating mode value calculation process:

(a) set steady judgement

Be used to judge whether unit is in steady state (SS), only under steady state (SS), just carry out the operating mode value and calculate that the thinking of set steady judgement is that unit load and main steam pressure variable quantity in a period of time are specially all less than given threshold value:

Unit actual load variable quantity is less than δ in the duration Δ _W, and

Unit main steam pressure variable quantity is less than δ in the duration Δ _P

Wherein δ W is a load variations threshold setting value, and δ p is a main steam pressure change threshold setting value.

(b) obtain current working number

According to current unit load, environment temperature and calorific value of coal value, calculate for people's formula (1)-(3), from table 1, check in unit actual condition number;

(c) parameter operating mode value is calculated and is upgraded (as shown in Figure 1)

Obtain each parameter operating mode value of operating mode correspondence and carry out statistical computation with current actual parameter from table 1, the result replaces former operating mode value as new operating mode value.

With operating mode in the table 1 numbers 5 is example: current working is 5, and main steam pressure operating mode value is 18MPa in this moment operating mode table 1, if actual main steam pressure is 18.2MPa, then utilizes mean value method to calculate 5 times new main steam pressure operating mode values of operating mode to be

(18+18.2)/2＝18.1MPa

(3) the operational factor verifying correctness method of adaptation condition variation

Through above-mentioned (1), after (2) step, set up and operating condition corresponding parameter condition value table (table 1).(as alarm detection, performance computation, automatic control etc.) all will carry out the parameter verifying correctness before the utilization and operation parameter at every turn, and inspection process (as shown in Figure 2) is described as follows:

(a) obtain current working number

According to current unit load, environment temperature and calorific value of coal value, calculate for people's formula (1)-(3), from table 1, check in unit actual condition number;

(b) obtain parameter operating mode value

From the duty parameter table, obtain each parameter operating mode value of operating mode correspondence.

(c) parameter verifying correctness algorithm

Be example with the main steam pressure still, establish that measured parameter value is P under the current working, the operating mode value is P ₀, then given zoom factor a:0≤a≤1, carry out verifying correctness by formula (4):

When satisfying formula (4), it is correct then to be judged as parameter, otherwise is judged as abnormal parameters.

(4) replacement of operational factor under the abnormal conditions

When judging abnormal parameters, will replace actual value with the operating mode value, and in subsequent applications, provide prompting;

As described above, when formula (4) when not satisfying, illustrate that measured parameter value P is away from operating mode value P ₀Think that measured parameter value P breaks down, and then carry out parameter and replace, promptly with operating mode value alternative parameter value:

P＝P ₀

This invention will be written as software module during enforcement, this software module may operate at:

(1) (needs DCS) among the DCS, as the DCS extended function module from programming the function support;

(2) in the supervisory information system (SIS), promptly can be used as the SIS functional module, also can be used as the stand-alone program operation, database and operation result and SIS share;

(3) be independent of in the plug-in industrial control system of DCS or SIS, get in touch with the two by communication.This industrial control system is in order to finish the senior application function that DCS or SIS do not possess, as burning optimization, load distribution etc.

Claims (1)

1. one kind adapts to the genset operational factor verifying correctness method that operating condition changes, and it is characterized in that, comprising:

(1) the genset operating condition is divided

At first genset is treated as an autonomous system, the current state of living in of genset is described by external parameter and inner parameter, external parameter is system and extraneous getting in touch, influenced by external factor, be unmodifiable, the environment temperature of going into the stove ature of coal, changing with the current weather situation that typical external parameter has the unit load that changes with the dispatching of power netwoks instruction, changes with current burning coal; Inner parameter is a unit externally under the restriction on the parameters, to the description of each link operation conditions of internal system, comprises power pressure, temperature, flow and enthalpy; Should satisfy mass balance, energy equilibrium, these specific moving laws of momentum balance between the internal parameters, as seen, inner parameter changes with the variation of external parameter and system architecture, for the unit that has put into operation, system architecture is determined, so inner parameter only changes with external parameter;

The combination of external parameter is defined as operating condition, so each external parameter combination is with regard to corresponding a kind of operating condition; Can run into different external parameter combinations in the actual moving process, also just form multiple operating condition.

With unit load P, environment temperature T and go into three external parameters of stove calorific value of coal Q and determine operating condition, the span of establishing three external parameters is respectively Pmin-Pmax, Tmin-Tmax and Qmin-Qmax, the discrete respectively N that turns to _P, N _r, N _qIndividual interval is called segments, and then three external parameter i section corresponding parameters spans are respectively

Unit load P:

$\frac{P_{\max }-P_{\min }}{N_P}\&CenterDot;i\&le;P<\frac{P_{\max }-P_{\min }}{N_P}\&CenterDot;(i+1),i=\mathrm{0,1},\mathrm{\&Lambda;},N_P-1---\left(1\right)$

Environment temperature T:

$\frac{T_{\max }-T_{\min }}{N_T}\&CenterDot;i\&le;T<\frac{T_{\max }-T_{\min }}{N_T}\&CenterDot;(i+1),i=\mathrm{0,1},\mathrm{\&Lambda;},N_T-1---\left(2\right)$

Go into stove calorific value of coal Q:

$\frac{Q_{\max }-Q_{\min }}{N_Q}\&CenterDot;i\&le;Q<\frac{Q_{\max }-Q_{\min }}{N_Q}\&CenterDot;(i+1),i=\mathrm{0,1},\mathrm{\&Lambda;},N_Q-1---\left(3\right)$

Above-mentioned three external parameters by the fragment number combination, can be obtained N _P* N _r* N _qIndividual unit operation operating mode, each operating mode definition is as shown in table 1.

Table 1 operating condition is divided and operational factor operating mode value

Operating mode number The unit load segment number The environment temperature segment number The calorific value of coal segment number Main steam pressure Boiler efficiency 0 0 0 0 18.0 92.0 …… 1 0 0 1 18.1 92.1 …… 2 0 0 2 18.2 92.2 …… 3 0 0 3 18.3 92.2 ……

4 0 0 4 18.4 92.3 …… 5 0 1 0 18.0 92.3 …… …… …… …… …… …… …… N _P×N _T×N _Q-1 N _P-1 N _T-1 N _Q-1 19.0 93.0 ……

So far, unit external parameter combination and operating condition number are mapped.

(2) the operational factor operating mode value calculating method of adaptation condition variation

Under a certain definite operating mode, the unit operation parameter all has a theoretical reference value because it changes with actual condition, still be referred to as operational factor operating mode value.Because genset is too complicated, it is unpractical that attempt obtains all operational factor operating mode values by the Analysis on Mechanism method, provides a kind of method of asking for operational factor operating mode value by data statistics here.

Operational factor operating mode value calculation process:

(a) set steady judgement

Be used to judge whether unit is in steady state (SS), only under steady state (SS), just carry out the operating mode value and calculate that the thinking of set steady judgement is that unit load and main steam pressure variable quantity in a period of time are specially all less than given threshold value:

Unit actual load variable quantity is less than δ in the duration Δ _W, and

Unit main steam pressure variable quantity is less than δ in the duration Δ _P

Wherein δ W is a load variations threshold setting value, and δ p is a main steam pressure change threshold setting value.

(b) obtain unit actual condition number

According to current unit load, environment temperature and calorific value of coal value, calculate for people's formula (1)-(3), from table 1, check in unit actual condition number;

(c) renewal of operational factor

Utilize under the current working in the operational factor actual value his-and-hers watches 1 the operational factor operating mode value under the corresponding operating mode to upgrade.Update method has two kinds: the one, substitute the operating mode value with actual value; The 2nd, with the alternative operating mode value of the weighted sum of actual value and operating mode value;

(3) the operational factor verifying correctness method of adaptation condition variation

Through above-mentioned (1), after (2) step, set up the operating condition corresponding parameter condition value table shown in the table 1, all to carry out the parameter verifying correctness before each utilization and operation parameter, inspection process is as follows:

(a) obtain current working number

According to current unit load, environment temperature and calorific value of coal value, calculate for people's formula (1)-(3), from

Check in unit actual condition number in the table 1;

(b) obtain parameter operating mode value

From the duty parameter table, obtain each parameter operating mode value of operating mode correspondence.

(c) parameter verifying correctness algorithm

Be example with the main steam pressure still, establish that measured parameter value is P under the current working, the operating mode value is P ₀, then given zoom factor a:0≤a≤1, carry out verifying correctness by following algorithm:

$\frac{P_0}{1+a}\&le;P\&le;P_0(1+a)---\left(4\right)$

When satisfying formula (4), it is correct then to be judged as parameter, otherwise is judged as abnormal parameters.

(4) replacement of operational factor under the abnormal conditions

When judging abnormal parameters, will replace actual value with the operating mode value, and in subsequent applications, provide prompting;

As described above, when formula (4) when not satisfying, illustrate that measured parameter value P is away from operating mode value P ₀Think that measured parameter value P breaks down, and then carry out parameter and replace, promptly with operating mode value alternative parameter value:

P＝P ₀

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