CN103855727B - The system of selection in POWER SYSTEM EMERGENCY CONTROL place - Google Patents

Abstract

A kind of system of selection of POWER SYSTEM EMERGENCY CONTROL place, according to the response message that WAMS obtains, effective control place of real-time calculating POWER SYSTEM EMERGENCY CONTROL, comprises the steps: 1, calculates every platform generator in critical machine relative to the rotor angle in the center of inertia, system local and angular speed; 2, the disturbed order of severity of each generator in critical machine is calculated; 3, weed out small-load generators, obtain cutting machine order sequencing table; 4, according to controlled quentity controlled variable and cut machine order, select effectively control place; The transient analysis process of the present invention to electric power system does not need to obtain the network configuration of electric power system and the model and parameter of element in advance, method information needed obtains according to real-time measuring data or calculates, can select fast and accurately effectively to cut machine place, reach real-time matching fault mode.

Description

The system of selection in POWER SYSTEM EMERGENCY CONTROL place

Technical field

The invention belongs to technical field of electric power system emergency control, be specifically related to a kind of system of selection of POWER SYSTEM EMERGENCY CONTROL place.

Background technology

The selection in POWER SYSTEM EMERGENCY CONTROL place, very crucial for control effects, identical controlled quentity controlled variable operates in different control places, and the result phase missionary society obtained is very large.

The implementation method mainly calculated off-line of current POWER SYSTEM EMERGENCY CONTROL, real-time matching.It works out the Policy Table of emergency control by a large amount of calculated off-line, control place be by virtue of experience or simulation result select, the control measure that Policy Table is corresponding with some catastrophe failures under containing anticipation operational mode.In practical power systems, the ruuning situation of measurement mechanism meeting moment detection system, when discovery system there occurs a certain catastrophe failure, will start emergency control system search strategy table and neutralize control measure corresponding to this fault phase and perform.Because power system operation mode is changeable, fault occurs uncertain, for a large-scale electrical network, if consider each operating condition and catastrophe failure, the strategy table that so off-line generates will be quite huge and time-consuming, only consider several typical condition in reality, the great stability disruption accident that some probability is low is simultaneously unforeseen in advance often.Therefore, calculated off-line, the adaptability of real-time matching mode to system conditions, fault type are poor.

Along with wide area measurement system (WAMS, WideAreaMeasurementSystem) in the installation of electric power system, in dynamic process, the curve movement of unit directly can be measured and need not rely on numerical computations, and this is undoubtedly for the emergency control that electric power system is real-time provides new development opportunity.WAMS can capture the real-time dynamic process of Large Scale Interconnected Systems each point under the same reference time, and Data Update speed reaches Millisecond, the instable Real time identification of transient state for electric power system provides possibility, its basic thought is the system trajectory information utilizing WAMS to provide, the rule of mining track information behind and mechanism, find out the relation between trace information and the stability of a system, realize Real-time Emergency Control algorithm.

But, determine that initiatively a unstability group of planes is very difficult online exactly.The present invention is from the single machine information under center of inertia coordinate, select an approximate active unstability group of planes, then the less generator of capacity is removed, form the disturbed degree sequencing table of generator to refer to that guided cutting machine controls according to the disturbed order of severity of each machine again, finally combination is cut machine controlled quentity controlled variable and is obtained cutting machine control law.

Summary of the invention

In order to solve above-mentioned prior art Problems existing, the object of the present invention is to provide a kind of system of selection of POWER SYSTEM EMERGENCY CONTROL place, the method surveys generator responds (merit angle, angular speed and uneven dynamic rate) information according to wide area dynamic information system (WAMS), and online real-time selection effectively cuts dynamo-electric factory.

In order to realize foregoing invention object, the technical scheme that the present invention takes is:

The system of selection in POWER SYSTEM EMERGENCY CONTROL place, according to the response message that WAMS obtains, calculates effective control place of POWER SYSTEM EMERGENCY CONTROL in real time, specifically comprises the steps:

Step 1: calculate every platform generator in critical machine S group relative to the rotor angle in the center of inertia, system local and angular speed:

δ _is＝δ _i-δ _s，ω _is＝ω _i-ω _s

Wherein: δ _ifor generator i is relative to the rotor angle of synchronous coordinate;

ω _ifor generator i is relative to the rotor velocity of synchronous coordinate;

δ _sfor the rotor angle in the center of inertia, generator local;

ω _sfor the rotor velocity in the center of inertia, generator local;

M _ifor the inertia time constant of generator i;

M _tsfor each generator time constant sum;

δ _is, ω _isfor generator i is relative to the system local rotor angle in the center of inertia and angular speed;

Step 2: determine system unstability moment Tc, calculates the index η of every disturbed degree of platform generator in reflection critical machine S group _i, and this index is arranged according to order from big to small;

η _i＝M _i·δ _isc·ω _isc

Wherein: M _ifor the inertia time constant of generator i;

δ _iscfor Tc moment generator i is relative to the rotor angle in the center of inertia, system local;

ω _iscfor Tc moment generator i is relative to the angular speed in the center of inertia, system local;

Get all η in critical machine S group _igenerator entirety composition initiatively unstability group of planes Ω (i) of >0, is designated as:

Ω(i)＝{i|η _i>0,i∈S}；

Step 3: the threshold value K arranging a unit capacity, weeds out the small-load generators that the middle mechanical output of initiatively unstability group of planes Ω (i) is less than K, and be controlled effectively place sequence:

Ω ' (i)={ i| η _i>0 and P _m>K, i ∈ S}

Wherein: Ω ' (i) effectively controls place, P _mit is mechanical output;

When cutting machine controlled quentity controlled variable Δ P _mafter determining, get total capacity and be greater than Δ P _mand closest to Δ P _mthe disturbed degree sequencing table of generator in former generators as cut machine control place.

Compared to the prior art, tool has the following advantages in the present invention:

The transient analysis process of the present invention to electric power system does not need to obtain the network configuration of electric power system and the model and parameter of element in advance, method information needed obtains according to real-time measuring data or calculates, can select fast and accurately effectively to cut machine place, reach real-time matching fault mode.

Accompanying drawing explanation

Fig. 1 is sample calculation Shandong system 500kV winding diagram in 2005.

Fig. 2 is the flow chart cutting machine ground point selection.

Fig. 3 be when not applying to control each generator relative to the power-angle curve figure at system inertia center.

Fig. 4 is the power-angle curve figure of each generator after control strategy is implemented relative to system inertia center.

Embodiment

Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.

As shown in Figure 1, select Shandong system in 2005, Shandong Province's power train altogether comprises 114 generators (its parameter is shown in annex 1), 23 500kV circuits.

A loop line (circuit number: 600624) upper 0 second three phase short circuit fault occurs in 500kV double-circuit line between bus " station, Liaocheng, Shandong 500 " and bus " station, Changqing, Shandong 500 ", and at 0.12 second excision faulty line, without power-angle curve figure during control measure as shown in Figure 3.Determine system unstability when 0.21s, 0.5s carries out machine of cutting and controls, and controlled quentity controlled variable is 1300MW.

Online real-time selection cuts machine place, and flow process as shown in Figure 2.

The first step: calculate each generator in critical machine relative to the rotor angle at system inertia center and angular speed, its result is as shown in table 1.

Critical machine is G9, G10, G11, G12, G52, G53, G54, G55, G56, G57, G58, G59, G95.

The each generator phase information of table 10.21s moment critical machine

Second step: the index η calculating every disturbed degree of platform generator in reflection critical machine _i, its result is as shown in table 2.

The disturbed level index of each generator of table 2 critical machine

Carry out sequence according to the disturbed degree of table 2 gained to obtain cutting machine order and be: G53, G52, G9, G59, G95, G58, G57, G11, G12, G10, G56, G54, G55.

3rd step: arrange a mechanical output threshold value k=100MW, weed out the generator that mechanical output in the middle of critical machine is less than 100MW, obtains new machine of cutting order: G53, G52, G9, G59, G95, G58, G57, G11, G12, G10, G56.

4th step: the controlled quentity controlled variable determined is 1300MW, former generating sets of machine order are cut in selection and mechanical output summation is greater than 1300MW, and machine of the cutting place finally determined is: G53, G52, G9.Controlled quentity controlled variable order is after 0.5s performs, and as shown in Figure 4, System recover is stable for the power-angle curve of system.

Annex 1 Shandong Province's electric power system 114 generator parameters

Claims (1)

1. the system of selection in POWER SYSTEM EMERGENCY CONTROL place, is characterized in that: the response message obtained according to WAMS, calculates effective control place of POWER SYSTEM EMERGENCY CONTROL in real time, specifically comprises the steps:

Step 1: calculate every platform generator in critical machine S group relative to the rotor angle in the center of inertia, system local and angular speed:

${\mathrm{\δ}}_s=\frac{1}{M_{Ts}}\underset{i=1}{\overset{s}{\Σ}}{M}_i{\mathrm{\δ}}_i,{\mathrm{\ω}}_s=\frac{1}{M_{Ts}}\underset{i=1}{\overset{s}{\Σ}}{M}_i{\mathrm{\ω}}_i,M_{Ts}=\underset{i=1}{\overset{s}{\Σ}}{M}_i$

δ _is＝δ _i-δ _s，ω _is＝ω _i-ω _s

Wherein: δ _ifor generator i is relative to the rotor angle of synchronous coordinate;

ω _ifor generator i is relative to the rotor velocity of synchronous coordinate;

δ _sfor the rotor angle in the center of inertia, generator local;

ω _sfor the rotor velocity in the center of inertia, generator local;

M _ifor the inertia time constant of generator i;

M _tsfor each generator time constant sum;

δ _is, ω _isfor generator i is relative to the system local rotor angle in the center of inertia and angular speed;

Step 2: determine system unstability moment Tc, calculates the index η of every disturbed degree of platform generator in reflection critical machine S group _i, and this index is arranged according to order from big to small;

η _i＝M _i·δ _isc·ω _isc

Wherein: M _ifor the inertia time constant of generator i;

δ _iscfor Tc moment generator i is relative to the rotor angle in the center of inertia, system local;

ω _iscfor Tc moment generator i is relative to the angular speed in the center of inertia, system local;

Get all η in critical machine S group _igenerator entirety composition initiatively unstability group of planes Ω (i) of >0, is designated as:

Ω(i)＝{i|η _i>0,i∈S}；

Step 3: the threshold value K arranging a unit capacity, weeds out the small-load generators that the middle mechanical output of initiatively unstability group of planes Ω (i) is less than K, and be controlled effectively place sequence:

Ω ' (i)={ i| η _i>0 and P _m>K, i ∈ S}

Wherein: Ω ' (i) effectively controls place, P _mit is mechanical output;

When cutting machine controlled quentity controlled variable Δ P _mafter determining, get total capacity and be greater than Δ P _mand closest to Δ P _mthe disturbed degree sequencing table of generator in former generators as cut machine control place.