CN105162126A - Regional voltage control method in local dispatching automatic voltage control (AVC) system - Google Patents

Abstract

The invention discloses a regional voltage control method in a local dispatching automatic voltage control (AVC) system. The regional voltage control method particularly comprises the following steps: (1) arranging n 110kV child buses in a region, recording the voltage of a 110kV father bus and reactive power Qi of the ith 110kV child bus to a 220kV transformer substation; (2) obtaining upper and lower limits Uimax and Uimin of the voltage of the ith 110kV child bus and the equivalent impedance Xi of the bus to the 220kV transformer substation; (3) calculating the voltage requirements of the ith 110kV child bus to the 110kV father bus; and (4) counting the ratio delta% of the 110kV child buses which meet the condition in the step (3) in the n 110kV child buses, and carrying out control according to the agreed rules. According to the regional voltage control method, the actual operation conditions of the branch with relatively high load and relatively large power supply radius are considered during fine adjustment; the adjusting times of a main transformer can be well reduced; and optimal adjustment of the voltage is achieved within a relatively large range.

Description

Adjust region voltage control method in AVC system a kind ofly

Technical field

The present invention relates to and adjust region voltage control method in AVC (automatism voltage control) system a kind ofly, belong to operation and control of electric power system technical field.

Background technology

Area power grid radially, is characterized in 220kV transformer station for power supply point, for several 110/35kV power below, and the grid structure that formation subregion, burst are powered.If this just determines 220kV root node, voltage is incorrect, and by probably causing, the busbar voltage large area of be with section is out-of-limit.

In order to bonding station voltage is qualified, can by regulating main transformer or the capacitor at single station, also can by regulating the main transformer of root node, the former belongs to local modulation strategy, do not consider the voltage condition of the overall situation, there is certain blindness, virtually add the adjustment number of times of plant stand equipment yet, even 110kV transformer station also cannot reach zone of reasonableness after regulating or occur vibration in adjustment process, causes device frequent movement; The latter can reach the tap switch of the least possible adjustment main transformer, reaches the regulation voltage level of maximum magnitude, can be avoided adjustment vibration when the multiple main transformer of multiple transformer station regulates simultaneously.

Visible, before carrying out list station voltage control, whether first judging area voltage levvl normally carries out regulating again is appropriate.If region voltage is general partially high/low, then regulate the main transformer of root node, voltage control of singly standing again on this basis.

The method adjusting region voltage to control at present be statistics 220kV main transformer with the voltage out-of-limit number of 110kV bus of 110kV plant stand, after this number exceedes certain threshold value, then starting region voltage control, regulates 220kV main transformer.But the method regulates threshold value, and setting is easy to affect regulating effect, in the area that 110kV bus number is less, crossing this threshold value is be relatively easy to, but for the bus that 110kV bus number is many, just not too easily enter this controlled condition, the adjustment comparatively become more meticulous can not be realized; Simultaneously the method have ignored current idle and reactance to the influence of voltage out-of-limit, cannot the heavy branch of reflected load or the long branch of supply path on the impact of regulating effect.Traditional region voltage control method is the out-of-limit situation of the bus by judging the mono-station of 110kV, this can make Rule of judgment shortage become more meticulous, simultaneously the method have ignored current idle and reactance to the influence of voltage out-of-limit, cannot the heavy branch of reflected load or the long branch of supply path on the impact of regulating effect.

Technical term is explained:

220kV tri-crimping medium voltage side 110kV bus is called for short father 110kV bus;

The 110kV bus of 110kV plant stand is called for short sub-110kV bus.

Summary of the invention

For the deficiency that prior art exists, the object of the invention is to provide adjusts region voltage control method in AVC system a kind ofly, while the adjustment that becomes more meticulous, can well reduce main transformer and regulate number of times, realize the optimizing regulation of voltage in a wider context.

To achieve these goals, the present invention realizes by the following technical solutions:

Of the present inventionly adjust region voltage control method in AVC system a kind ofly, namely judge the enabling capabilities size of father 110kV busbar voltage antithetical phrase 110kV busbar voltage and the method for control, specifically comprise following step:

(1) establish in this region and have n strip 110kV bus, real time record father 110kV busbar voltage U ₁₁₀, the i-th strip 110kV bus is to the idle Q of 220kV transformer station _i;

(2) the bound U of the i-th strip 110kV busbar voltage is obtained _imax, U _iminand this bus is to the equivalent impedance X of 220kV transformer station _i;

(3) the i-th strip 110kV bus is calculated to the voltage request of father 110kV bus $\[U_{i\min }+\frac{Q_i{X}_i}{U_{imin}},U_{imax}+\frac{Q_i{X}_i}{U_{imax}}\];$

(4) add up in n strip 110kV bus, father 110kV busbar voltage meets the ratio δ % shared by sub-110kV bus of step (3) condition, controls according to following rule:

(1) if the father 110kV busbar voltage of 220kV plant stand can meet the busbar voltage inequality constraints of sub-110kV simultaneously, then control model of singly standing is entered;

(2) if the father 110kV busbar voltage of 220kV plant stand can meet the busbar voltage inequality constraints of the sub-110kV of 80%, then control model of singly standing is entered;

(3) if the father 110kV busbar voltage of 220kV plant stand gets over the upper limit constraint of the busbar voltage inequality of the sub-110kV of δ %, and do not violate the lower limit constraint of inequality, then region voltage is higher, carries out region voltage control;

(4) if the father 110kV busbar voltage of 220kV plant stand gets over the lower limit constraint of the busbar voltage inequality of the sub-110kV of δ %, and do not violate the upper limit constraint of inequality, then region voltage is on the low side, carries out region voltage control;

(5) if the father 110kV busbar voltage of 220kV plant stand gets over the upper limit constraint of the busbar voltage inequality of the sub-110kV of δ %, but there is the bus of the lower limit constraint of violating inequality, then remove Q _ix _imaximum and U _imax-U _iminminimum bus, then the bus continuing whether statistics has more lower limit, if still existed, then illustrate that in this region, voltage is normal, do not need to carry out region voltage control, otherwise region voltage is higher, carries out region voltage control;

(6) if the father 110kV busbar voltage of 220kV plant stand gets over the lower limit constraint of the busbar voltage inequality of the sub-110kV of δ %, but there is the bus of the upper limit constraint of violating inequality, then remove Q _ix _imaximum and U _imax-U _iminminimum bus, then the bus continuing whether statistics has the more upper limit, if still existed, then illustrate that in this region, voltage is normal, do not need to carry out region voltage control, otherwise region voltage is on the low side, carries out region voltage control.

The present invention, while becoming more meticulous and regulating, considers comparatively large (the also i.e. equivalent impedance X of load and radius of electricity supply _ilarger) the practical operation situation of branch, main transformer can well be reduced and regulate number of times, realize the optimizing regulation of voltage in a wider context.

Accompanying drawing explanation

Fig. 1 is 220kV plant stand father 110kV and 110kV plant stand sub-110kV bus schematic diagram.

Embodiment

The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.

When the 110kV busbar voltage of 110kV plant stand in region is generally higher or on the low side, the voltage regulating root node 220kV main transformer to improve the 110kV bus of medium voltage side reduces number of equipment action, a kind of important means of control band voltage.

Traditional region voltage control method is the out-of-limit situation of the bus by judging the mono-station of 110kV, this can make Rule of judgment shortage become more meticulous, simultaneously the method have ignored current idle and reactance to the influence of voltage out-of-limit, cannot the heavy branch of reflected load or the long branch of supply path on the impact of regulating effect.

The present invention proposes a kind of new region voltage control method, while the adjustment that becomes more meticulous, consider the practical operation situation of load and the larger branch of radius of electricity supply, main transformer can well be reduced and regulate number of times, realize the optimizing regulation of voltage in a wider context.

See Fig. 1, concrete grammar is as follows:

There is the bus of 5 strip 110kV in this region, if i-th busbar voltage bound is respectively U _imaxand U _imin, this bus is X to the equivalent impedance of 220kV transformer station _i, idle is Q _iif the voltage of the father 110kV bus of 220kV plant stand can meet the bound of 5 strip 10kV busbar voltages, then this area's voltage is not higher or on the low side, if that is set up with lower inequality simultaneously, then this region voltage is higher or on the low side scarcely simultaneously.

$\left\{\begin{array}{c}{U}_{1min}+\frac{Q_1{X}_1}{U_{1min}}<U_{110}<U_{1max}+\frac{Q_1{X}_1}{U_{1max}}\\ U_{2min}+\frac{Q_2{X}_2}{U_{2min}}<U_{110}<U_{2max}+\frac{Q_2{X}_2}{U_{2max}}\\ .\\ .\\ .\\ U_{5min}+\frac{Q_5{X}_5}{U_{5\min }}<U_{110}<U_{5max}+\frac{Q_5{X}_5}{U_{5\max }}\end{array}\right.$

In formula, U ₁₁₀for the voltage of father 110kV bus.

If voltage is higher or on the low side in region, then the inequality overwhelming majority above can not meet.

The present invention judges that core that whether root node voltage can prop up chapelet 110kV busbar voltage is the requirement to father 110kV busbar voltage by calculating child node voltage, and the basis for estimation that traditional region voltage controls is the out-of-limit situation of sub-110kV busbar voltage, both is different in itself.

The method that a kind of judging area voltage that the present invention proposes is higher or on the low side, the core of the method judges whether root node voltage can prop up chapelet 110kV busbar voltage, mainly by calculating the requirement to father 110kV busbar voltage of child node voltage, and then see father 110kV busbar voltage whether in the restriction range of each sub-110kV busbar voltage; Consider the heavy branch of load or the long branch of supply path, thus realize the independent control to both of these case.

The present invention is according to the general principle of electric power system, how the problem that judging area voltage is higher or on the low side is solved theoretically, or actually improper single station voltage control problem of the voltage out-of-limit root node voltage of the 110kV bus of 110kV plant stand can be told preferably, also can take distinguishing regulation measure to the heavy branch of load or the long branch of supply path simultaneously.

More than show and describe general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.

Claims (1)

1. a region voltage control method in AVC system is adjusted on ground, it is characterized in that, specifically comprises following step:

(1) establish in this region and have n strip 110kV bus, real time record father 110kV busbar voltage U ₁₁₀, the idle Q of the i-th strip 110kV bus _i;

(2) the bound U of the i-th strip 110kV busbar voltage is obtained _imax, U _iminand this bus is to the equivalent impedance X of 220kV transformer station _i;

(3) the i-th strip 110kV bus is calculated to the voltage request of father 110kV bus $\&lsqb;U_{i\min }+\frac{Q_i{X}_i}{U_{imin}},U_{imax}+\frac{Q_i{X}_i}{U_{imax}}\&rsqb;;$

(4) add up in n strip 110kV bus, father 110kV busbar voltage meets the ratio δ % shared by sub-110kV bus of step (3) condition, controls according to following rule:

(1) if the father 110kV busbar voltage of 220kV plant stand can meet the busbar voltage inequality constraints of n strip 110kV simultaneously, then control model of singly standing is entered;

(2) if the father 110kV busbar voltage of 220kV plant stand can meet the busbar voltage inequality constraints of the sub-110kV of 80%, then control model of singly standing is entered;

(3) if the father 110kV busbar voltage of 220kV plant stand gets over the upper limit constraint of the busbar voltage inequality of the sub-110kV of δ %, and do not violate the lower limit constraint of inequality, then region voltage is higher, carries out region voltage control;

(4) if the father 110kV busbar voltage of 220kV plant stand gets over the lower limit constraint of the busbar voltage inequality of the sub-110kV of δ %, and do not violate the upper limit constraint of inequality, then region voltage is on the low side, carries out region voltage control;

(5) if the father 110kV busbar voltage of 220kV plant stand gets over the upper limit constraint of the busbar voltage inequality of the sub-110kV of δ %, but there is the bus of the lower limit constraint of violating inequality, then remove Q _ix _imaximum and U _imax-U _iminminimum bus, then the bus continuing whether statistics has more lower limit, if still existed, then illustrate that in this region, voltage is normal, do not need to carry out region voltage control, otherwise region voltage is higher, carries out region voltage control;

(6) if the father 110kV busbar voltage of 220kV plant stand gets over the lower limit constraint of the busbar voltage inequality of the sub-110kV of δ %, but there is the bus of the upper limit constraint of violating inequality, then remove Q _ix _imaximum and U _imax-U _iminminimum bus, then the bus continuing whether statistics has the more upper limit, if still existed, then illustrate that in this region, voltage is normal, do not need to carry out region voltage control, otherwise region voltage is on the low side, carries out region voltage control.