CN106992528A - A kind of method of the improvement idle allocation strategies of unit AVC - Google Patents

Abstract

A kind of method of the improvement idle allocation strategies of unit AVC, step is：(1) difference between the setting value and real hair value of busbar voltage, power plant's reactive power command value under busbar voltage setting value is calculated by increment type PID；(2) power plant's reactive power command value passes through the idle distribute module of unit, calculates AVC unit reactive command values in groups, reactive command value is by idle needed for AVR closed-loop paths generation unit；(3) when unit is without the distribution of work, manual mode is clicked on using operations staff or automatic mode introduces idle biasing module and carries out reactive command adjustment.The present invention unit AVC is idle be allocated when, add idle biasing module, on the one hand provide a more autonomous idle method of salary distribution for Power Plant operations staff；On the other hand the reactive balance relation between unit can be improved, it is to avoid locking that unit AVC is idle, improves full factory AVC regulations speeds, it is ensured that power plant's varying DC link voltage qualification rate.

Description

A kind of method of the improvement idle allocation strategies of unit AVC

Technical field

It is that a kind of power plant's busbar voltage is adjusted the invention belongs to power plant AVC substations automatism voltage control technical field When, by adding idle biasing module, amount of bias that artificial introducing is idle, so that the reactive balance relation between improving unit, The idle lockings of unit AVC are avoided, full factory AVC regulations speed and a kind of controlling party of varying DC link voltage qualification rate is improved Method.

Background technology

At present, what the idle allocation strategies of nearly all power plant AVC were used be only constant power factoring method, average distribution system, by The proportional distribution of unit reactive capability sends out proportional distribution active in fact by unit.Power plant according to the actual conditions of oneself unit and The difference of target is adjusted, the rational idle allocation algorithm of unit is selected, good distribution effects can be obtained, but these methods All Shortcomings, all do not provide between unit idle internal adjustment for power plant operations staff and avoid the idle locking of unit, Improve the chance of power plant's varying DC link voltage speed.

The content of the invention

The purpose of the present invention precisely in order to overcome defect that above-mentioned prior art is present and provide it is a kind of improve unit AVC without The method of distribution of work strategy, this method unit AVC is idle be allocated when, add idle biasing module, be on the one hand electricity Brand-name computer group operations staff provides a more autonomous idle method of salary distribution；On the other hand it can improve idle between unit Equilibrium relation, it is to avoid locking that unit AVC is idle, improves full factory AVC regulations speed, it is ensured that power plant's varying DC link voltage it is qualified Rate.

The present invention is improved traditional idle allocation algorithm, and idle biasing is adjusted into function is fused to allocation algorithm In, propose based on by the proportional idle offset allocations method of unit reactive capability.Idle biasing refers to that operations staff manually adjusts Biasing changes wherein one unit and instructed without the distribution of work, and remaining all unit is automatically adjusted according to current allocation algorithm, machine Group is idle, and allocation result synchronously changes round about, so as to ensure that total Target of Reactive Power after regulation is constant, realizes input AVC work( Idle transfer and adjustment function between the unit of energy.

What the object of the invention was realized in：Comprise the following steps：

(1) difference between the setting value and real hair value of busbar voltage, busbar voltage is calculated by increment type PID Power plant's reactive power command value under setting value；

When actual controlled voltage close loop is controlled, the general PI effects using in Increment Type Digital Hydraulic PID controller, wherein PI The difference equation of controller is expressed as：

Q (k)=Q (k-1)+K_P·(E(k)-E(k-1))+K_I·E(k) (1)

In formula：E (k)=U (k)-U (k-1) represents the regulation error of busbar voltage during this regulation

By field test, according to the change of controlled voltage and reactive power, and Increment Type Digital Hydraulic PID controller is combined Output and full factory's Target of Reactive Power value setting module conversion relation, determine the parameter K of Increment Type Digital Hydraulic PID controller_pAnd K_I, So as to the mutual conversion between realizing voltage and being idle, and the closed-loop control to controlled bus；

(2) power plant's reactive power command value passes through the idle distribute module of unit, calculates AVC unit reactive command values in groups, Reactive command value is by idle needed for AVR closed-loop paths generation unit；

(3) when unit is without the distribution of work, idle biasing module is introduced, operations staff clicks on manual mode, manually adjusts partially The unit changed in groups in unit is put to instruct without the distribution of work, remaining in groups unit according to the proportional allocation algorithm of reactive capability Carry out reactive command adjust automatically；Or operations staff clicks on idle biasing automatic mode, idle allocation algorithm can very accordingly when The real maximum and minimum value sent out that unit is idle, the idle increment of full factory, root are calculated according to the proportional algorithm of unit reactive capability The new reactive command value of unit in groups is calculated again according to idle increment；

(4) when idle biasing module is in manual mode, AVC systems are divided in portion according to unit reactive capability, equation It is as follows：

In formula：--- AVC throws the automatic idle biasing summation of unit；

--- participate in the idle summation of unit of AVC distribution；

--- have neither part nor lot in the idle summation of unit of AVC distribution；

Q_T--- represent full factory's Target of Reactive Power value；

--- participate in AVC distribution unit reactive capability coefficient and；

N --- full brand-name computer group sum；

L --- have neither part nor lot in AVC distribution unit sums；

M --- participate in AVC distribution units and throw idle biasing module sum；

Y --- the idle increment always instructed of full factory.

It is no-harass switch during in order to ensure that machine is cut to automatic manually by AVC, manual allocation result is not pulled, it is necessary to anti- The idle biasing of the unit is calculated, as shown in formula：

B_i=Q_i-K_iY (4)

(5) when idle biasing module is in automatic mode, AVC systems are divided in portion according to unit reactive capability, equation It is as follows：

Using MAX, MIN function calculates idle real the hair maximum and minimum value of input AVC units：

The idle increment always instructed is calculated according to input AVC unit capacity ratios：

According to the new without distribution of work new command value of idle total instruction incremental computations input AVC units：

Q′_ii=Q_ii-Y (8)。

The beneficial effects of the invention are as follows can be taking human as the idle biasing for manually or automatically adding automatism voltage control unit , when carrying out varying DC link voltage, there is the idle locking of unit, shadow in value, it is to avoid when original state that multimachine unit is idle is inconsistent Regulations speed, can be generalized in hydroelectric power plant's even new energy AVC control fields with ringing busbar voltage.

Brief description of the drawings

Fig. 1 is power plant AVC control structure block diagrams of the invention；

Fig. 2 improves the structured flowchart of unit AVC allocation strategies for the present invention.

Embodiment

A kind of method of the improvement idle allocation strategies of unit AVC, its is idle, and allocation strategy improvement comprises the following steps：

(1) difference between the setting value and real hair value of busbar voltage, busbar voltage is calculated by increment type PID Power plant's reactive power command value under setting value；

When actual controlled voltage close loop is controlled, the general PI effects using in Increment Type Digital Hydraulic PID controller, wherein PI The difference equation of controller is expressed as：

Q (k)=Q (k-1)+K_P·(E(k)-E(k-1))+K_I·E(k) (1)

In formula：E (k)=U (k)-U (k-1) represents the regulation error of busbar voltage during this regulation

By field test, according to the change of controlled voltage and reactive power, and Increment Type Digital Hydraulic PID controller is combined Output and full factory's Target of Reactive Power value setting module conversion relation, determine the parameter K of Increment Type Digital Hydraulic PID controller_pAnd K_I, So as to the mutual conversion between realizing voltage and being idle, and the closed-loop control to controlled bus；

(2) power plant's reactive power command value passes through the idle distribute module of unit, and the unit for calculating input AVC functions is idle Command value, reactive command value is by idle needed for AVR closed-loop paths generation unit；

(3) when unit is without the distribution of work, idle biasing module is introduced, operations staff clicks on manual mode, manually adjusts partially Put wherein one unit of change to instruct without the distribution of work, remaining all unit is automatically adjusted according to current allocation algorithm；Or Operations staff clicks on idle biasing automatic mode, and biasing that unit is idle can be entered according to the idle real hair value for putting into AVC function units Comparison without work value between row unit, and according to etc. capacity biasing means, draw the idle apportioning cost of new unit.

(4) when idle biasing module is in manual mode, AVC systems are divided in portion according to unit reactive capability, equation It is as follows：

In formula：--- AVC throws the automatic idle biasing summation of unit；

--- participate in the idle summation of unit of AVC distribution；

--- have neither part nor lot in the idle summation of unit of AVC distribution；

Q_T--- represent full factory's Target of Reactive Power value；

--- participate in AVC distribution unit reactive capability coefficient and；

N --- full brand-name computer group sum；

L --- have neither part nor lot in AVC distribution unit sums；

M --- participate in AVC distribution units and throw idle biasing module sum；

Y --- the idle increment always instructed of full factory.

It is no-harass switch during in order to ensure that machine is cut to automatic manually by AVC, manual allocation result is not pulled, it is necessary to anti- The idle biasing of the unit is calculated, as shown in formula：

B_i=Q_i-K_iY (4)

(5) when idle biasing module is in automatic mode, AVC systems are divided in portion according to unit reactive capability, equation It is as follows：

Using MAX, MIN function calculates idle real the hair maximum and minimum value of input AVC units：

The idle increment always instructed is calculated according to input AVC unit capacity ratios：

According to the new without distribution of work new command value of idle total instruction incremental computations input AVC units：

Q′_ii=Q_ii-Y (8)。

Claims (1)

1. a kind of method of the improvement idle allocation strategies of unit AVC, it is characterised in that comprise the following steps：

(1) difference between the setting value and real hair value of busbar voltage, busbar voltage setting is calculated by increment type PID Power plant's reactive power command value under value；

When actual controlled voltage close loop is controlled, the general PI effects using in Increment Type Digital Hydraulic PID controller, wherein PI controls The difference equation of device is expressed as：

Q (k)=Q (k-1)+K_P·(E(k)-E(k-1))+K_I·E(k) (1)

In formula：E (k)=U (k)-U (k-1) represents the regulation error of busbar voltage during this regulation；

By field test, according to the change of controlled voltage and reactive power, and the defeated of Increment Type Digital Hydraulic PID controller is combined Go out the conversion relation with full factory's Target of Reactive Power value setting module, determine the parameter K of Increment Type Digital Hydraulic PID controller_pAnd K_I, so that Mutual conversion between realizing voltage and being idle, and the closed-loop control to controlled bus；

(2) power plant's reactive power command value passes through the idle distribute module of unit, calculates AVC unit reactive command values in groups, idle Command value is by idle needed for AVR closed-loop paths generation unit；

(3) when unit is without the distribution of work, idle biasing module is introduced, operations staff clicks on manual mode, manually adjusts biasing and change Become a unit in groups in unit to instruct without the distribution of work, remaining in groups unit carried out according to the proportional allocation algorithm of reactive capability Reactive command adjust automatically；Or operations staff clicks on idle biasing automatic mode, idle allocation algorithm can very accordingly when unit The maximum and minimum value of idle real hair, calculate the idle increment of full factory, according to nothing according to the proportional algorithm of unit reactive capability Work(increment calculates the new reactive command value of unit in groups again；

When idle biasing module is in manual mode, AVC systems are divided in portion according to unit reactive capability, and equation is as follows：

$Y=Q_T-\underset{i=1}{\overset{M}{\Σ}}{B}_i-\underset{i=1}{\overset{N-L}{\Σ}}{Q}_i-\underset{j=1}{\overset{L}{\Σ}}{Q}_j---\left(2\right)$

$Q_i^{\′}=Q_i+\frac{K_i}{\underset{i=1}{\overset{N-L-M}{\Σ}}{K}_i}Y+B_i---\left(3\right)$

In formula：--- AVC throws the automatic idle biasing summation of unit；

--- participate in the idle summation of unit of AVC distribution；

--- have neither part nor lot in the idle summation of unit of AVC distribution；

Q_T--- represent full factory's Target of Reactive Power value；

--- participate in AVC distribution unit reactive capability coefficient and；

N --- full brand-name computer group sum；

L --- have neither part nor lot in AVC distribution unit sums；

M --- participate in AVC distribution units and throw idle biasing module sum；

Y --- the idle increment always instructed of full factory；

It is no-harass switch during in order to ensure that machine is cut to automatic manually by AVC, manual allocation result is not pulled, it is necessary to which inverse should Biasing that unit is idle, as shown in formula：

B_i=Q_i-K_iY (4)

When idle biasing module is in automatic mode, AVC systems are divided in portion according to unit reactive capability, and equation is as follows：

Using MAX, MIN function calculates idle real the hair maximum and minimum value of input AVC units：

$\begin{array}{c}{Q}_{ii}=MAX\[Q_i,i\∈(1,2,\mathrm{...}N-L)\]\\ Q_{jj}=MIN\[Q_i,i\∈(1,2,\mathrm{...}N-L)\]\end{array}---\left(5\right)$

The idle increment always instructed is calculated according to input AVC unit capacity ratios：

$Y=Q_{ii}-\frac{K_{jj}\·K_{ii}}{\underset{i=1}{\overset{N-L}{\Σ}}{K}_i}{Q}_{jj}---\left(6\right)$

According to the new without distribution of work new command value of idle total instruction incremental computations input AVC units：

$Q_i^{\′}=Q_i+\frac{K_i}{\underset{i=1}{\overset{N-L-1}{\Σ}}{K}_r}Y---\left(7\right)$

Q′_ii=Q_ii-Y (8)。