CN202166727U - System for monitoring characteristic of generating set excitation system - Google Patents
System for monitoring characteristic of generating set excitation system Download PDFInfo
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Abstract
The utility model discloses a system for monitoring characteristics of a generating set excitation system, comprising a synchronous phasor measurement unit, an excitation characteristic monitoring host and an excitation characteristic display device, wherein the synchronous phasor measurement unit is connected with the excitation characteristic display device via the excitation characteristic monitoring host, the synchronous phasor measurement unit acquires state variables of the generating set excitation system and sends the acquired state variables to the excitation characteristic monitoring host, the excitation characteristic monitoring host generates monitoring data according to the state variables, and the excitation characteristic display device displays the monitoring result generated by the excitation characteristic monitoring host.
Description
Technical field
The utility model closes generator excitation system, particularly about the generator excitation system characteristic, is a kind of generator excitation system characteristic monitoring system concretely.
Background technology
In the prior art; The generator excitation performance on-line analysis system that becomes more meticulous; Can realize the functions such as graphical demonstration and data-switching of monitoring record ripple, the record data of excitation system running status, realize the steady-state behaviour of generator excited system is carried out qualitative analysis.
Generator excitation performance analysis system of the prior art, running status and correlated performance index that the management and running personnel can only qualitative understanding generator excited system, dynamic response performance index that can not the exact grasp generator excited system; Simultaneously; The performance analysis mode of existing generator excited system needs a large amount of personnel to participate in when obtaining data, because the time reference difference of fault oscillograph is bigger, the operations staff is wasted time and energy when searching fault data; When carrying out data analysis; Need the analyst to carry out the conversion of data perunit value, the associated dynamic index is calculated in programming, and efficient is lower.
The utility model content
The utility model embodiment provides a kind of generator excitation system characteristic monitoring system, and this system comprises: synchronous phasor measuring device, excitation property monitoring main frame and excitation property display device; Synchronous phasor measuring device is connected with the excitation property display device through excitation property monitoring main frame; Wherein, synchronous phasor measuring device is gathered the state variable of generator excitation system, and the state variable of the generator excitation system of gathering is sent to excitation property monitoring main frame; Excitation property monitoring main frame generates Monitoring Data according to the state variable of the generator excitation system of the synchronous phasor measuring device transmission that receives; The excitation property display device shows the monitoring result that excitation property monitoring main frame generates.
For let the above-mentioned of the utility model and other purposes, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended graphicly, elaborates as follows.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the utility model generator excitation system;
Fig. 2 is the structured flowchart of the monitoring main frame among the utility model embodiment;
Fig. 3 is the structured flowchart of the Monitoring Data generating apparatus among the utility model embodiment;
Fig. 4 is the structured flowchart of the disturbance information generation module among the utility model embodiment;
Fig. 5 is the structured flowchart of the monitoring main frame among the another embodiment of the utility model;
Fig. 6 is the system construction drawing of the utility model one embodiment;
Fig. 7 A is the statement form of regulator automated manner year devoting rate;
Fig. 7 B be PSS throw/move back the year devoting rate statement form;
Fig. 8 is the pictorial definition of three dynamic perfromance indexs among the utility model embodiment;
Fig. 9 is generator P/Q running status border;
Figure 10 is the working range of the state variable of excitation system.
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
The generator excited system of being furnished with automatic exciting regulator (AVR) and power system stabilizer, PSS (PSS) has important effect for the safe and stable operation of electric system.Excitation system is in operation, and the operations staff of power plant mainly keeps watch on the duty of excitation system at Central Control Room through keeping watch on quantity of states such as generator voltage, magnetic field voltage and field supply.
Substation synchronous phasor measuring device in the network system in the utility model removes to be measured the genset correlation behavior amount, also measures to comprise that generator field voltage, field supply, hand/auto state and PSS throw/move back the signal of reaction excitation system adjusting dynamic process such as state.
As shown in Figure 1, for the utility model discloses a kind of generator excitation system characteristic monitoring system, this system comprises: synchronous phasor measuring device 101, excitation property monitoring main frame 102 and excitation property display device 103; Synchronous phasor measuring device 101 is connected with described excitation property display device 103 through excitation property monitoring main frame 102; Synchronous phasor measuring device 101 is gathered the state variable of the excitation system of genset 20, and the state variable of the excitation system of the genset of gathering 20 is sent to excitation property monitoring main frame 102; Excitation property monitoring main frame 102 generates Monitoring Data according to the state variable that receives; Excitation property display device 103 shows the monitoring result that described excitation property monitoring main frame generates.
As shown in Figure 2; Monitoring main frame 102 in the utility model comprises: Monitoring Data generating apparatus 1021; The state variable of the generator excitation system of gathering according to synchronous phasor measuring device 101 generates the Monitoring Data that comprises excitation system performance index data and noisy data; Excitation property data storage device 1022, the excitation system performance index data that storage Monitoring Data generating apparatus 1021 generates, disturbance information data storage device 1023 is stored the noisy data that described Monitoring Data generating apparatus 1021 generates.As shown in Figure 3, Monitoring Data generating apparatus 1021 further comprises: field performance computing module 301 and disturbance information generation module 302.Wherein, as shown in Figure 4, disturbance information generation module 302 comprises: disturbance judging unit 3021, according to the disturbance quantity generation disturbance judged result of generating unit excitation voltage; Noisy data generation unit 3022 according to described judged result record disturbance event information, generates noisy data.The disturbance judging unit compares according to generator field voltage and preset field voltage threshold value, according to the variable quantity generation noisy data of generator field.The disclosed monitoring main frame of the utility model also comprises simultaneously: generator information-storing device 1024 and model parameter memory storage 1025, and as shown in Figure 5, with concrete embodiment the utility model is explained further details below.
The disclosed embodiment of the utility model, generator excitation performance on-line analysis system research contents comprises: on-line analysis module, historical failure database and off-line ADVANCED APPLICATIONS analysis module.Have the functions such as graphical demonstration and data-switching of monitoring record ripple, the record data of excitation system running status, mainly comprise following aspect:
(1) main station system should be able to show the running status and basic service data of excitation system, and can be according to the data generating run trend map that receives.
(2) main station system should be able to carry out graphic presentation according to the form of time coordinate, unit perunit value mode or customer requirements with the field notes data that receive, and provides certain analysis expert to handle means.
(3) main station system should be able to carry out Data Format Transform with record data, is beneficial to use the existing simulation means of electrical network that its record wave-wave shape is carried out playback and simulation analysis processing.
(4) main station system should be able to provide technical finesse functions such as the computational analysis of record data and demonstrations, to satisfy the requirement that the user handles and preserves the selective analysis of data.
The application of genset controller properties real-time monitoring system realizes real-time monitoring and on-line evaluation to the unit adjusting function, supervises at the fortune unit equipment up to standardly, and the effect technique means that provide for supervision and management have realized technological innovation and management innovation.
Real-time dynamic monitoring system (WAMS) can catch the dynamic process of electric system electrical network under situation such as fault disturbance, low-frequency oscillation and artificial test in real time.The utility model is on the basis of existing WAMS system repertoire; Further develop the whole network automatic excitation adjustor of generator performance on-line monitoring system; Through setting up the whole network generator excited system database, realize electrical network is had jurisdiction over the ADVANCED APPLICATIONS analysis of generating unit excitation regulator performance.
The utility model need be realized the real time data exchange with original WAMS platform; Through setting up new Platform Implementation generator excited system become more meticulous analytical calculation and displaying; System architecture is as shown in Figure 6 to be comprised: WAMS platform 601, monitoring main frame 602 and display device 603.
The system of the utility model embodiment divides foundation, on-line data analysis evaluation and picture exhibition three partial contents that mainly comprise database by function.Through WAMS platform acquisition state variable, in the monitoring main frame, set up database and the state variable of gathering is carried out assay, generate analysis result, through picture exhibition part display analysis result.
1, in the excitation property memory storage of monitoring main frame, sets up database, mainly store the Back ground Information of generator, relevant disturbance information with excitation system and the unit correlated performance index that calculates etc.Particular content in the database is following:
1) essential information of generator
The Basic Information Table of generator comprises: generator group name, record genus company, capacity, excitation system type, excitation mode etc.
The manual typing in early stage of this content, the later stage should with digitizing support platform interface, directly read related content.
2) generator excitation system model parameter
The excitation system model parameter of genset refers to that mainly test is integrated into model and the parameter under the BPA to each genset through on-site parameters.
The manual typing in early stage of this content, i.e. input media input through the monitoring main frame, the later stage can with digitizing support platform interface, directly read related content.
3) disturbance relevant information
When electrical network big disturbance or the fault of unit own takes place big disturbance takes place, (be beyond the boundary or a certain generator state variable such as field voltage transition amount surpass 5% like the automatic excitation adjustor of generator running status), then record plays all disturbance event information this moment in the noisy data memory storage.
Disturbance event information comprises: start event variable name, variable amplitude, disturbed machine group name, GPS markers etc.
4) correlated performance index
The main following content of access: according to the excitation system correlated performance index that disturbance calculates, record ASSOCIATE STATISTICS information, the various devoting rates under the record stable state etc.
2, through the monitoring main frame excitation system characteristic is carried out on-line monitoring and analysis part; Characteristic analysis to generator excited system comprises: correlated performance index under correlated performance index, the load test under the input state of generator, the unit no-load test is analyzed monitoring, and concrete calculating is following:
(1) AUTO ON drops into status monitoring and statistics
According to the requirement of " turbodynamo AC exciter excitation system technical conditions ", automatic voltage regulator should guarantee that devoting rate is not less than 99%.Transfer excitation management and running regulation based on state, state transfers the unit that requires input, and its AVR must drop into during unit operation.
Regulator automated manner year devoting rate is calculated as follows:
Statement form is shown in Fig. 7 A.
(2) PSS ON drops into the monitoring and the statistics of state
Requirement according to " turbodynamo AC exciter excitation system technical conditions ": the PSS devoting rate is not less than 90%.Close files specify according to state's phase modulation, state accent requirement input PSS function, its PSS devoting rate necessary 100%.
The year devoting rate that PSS throws/moves back is calculated as follows:
Statement form is shown in Fig. 7 B.
(3) correlated performance index under the no-load test
Whether generator open-circuit excitation regulator " automated manner " voltage disturbance response down comprises overshoot, rise time and adjusting time etc., can meet the demands in generator no-load test stage inspection excitation system dynamic perfromance;
According to DL-T650-1998 " large turbo-type generator is from shunt excitation static excitation system technical conditions ", exciter control system voltage given step response should satisfy following requirement:
The adjusting time is not more than 5s;
The number of oscillation is not more than 3 times;
A, overshoot M
pBe defined as: in the step disturbance, the difference of the maximal value of controlled volume and final steady-state value is for the percentage of the ratio of step amount.
Overshoot is not more than 30% of step amount;
Computing formula:
B, rise time t
UpBe defined as: in the step disturbance, the time of controlled volume from 10% to 90% step amount.Rise time is not more than 0.6s;
t
up＝t(B)-t
0
C, adjusting time t
sBe defined as: take place from step signal or excitation signal, to the time that controlled volume reaches and finally the absolute value of the difference of steady-state value is no more than 5% stable state change amount (C point in the way).
t
s＝t(C)-t
0
Fig. 8 has provided the pictorial definition of three dynamic perfromance indexs, and wherein, Uo is an initial value, and Ui is final steady-state value.
(4) correlated performance index under the load test
A, disturbance quantity size are judged:
Variable quantity to the field voltage in the state variable of synchronous phasor measuring device collection is monitored, and the variable quantity in generator field voltage 20ms surpasses 0.1p.u., starts the corresponding program in the monitoring main frame.Simultaneously, can also from other data of uploading, choose the startup variable of corresponding program in the above-mentioned monitoring main frame, as: generator terminal voltage, active power etc., definite value can be revised.
B, correlated performance index are calculated
Step amount is 2%～4% of a generator rated voltage, and active power fluctuation number of times is not more than 5 times, and damping ratio is greater than 0.1, and the adjusting time is not more than 10s.
Under the loading condition, mainly calculate damping ratio.
The calculating of damping ratio divides two kinds of methods:
Method one: the disturbed curve of unit active power during according to load, calculate damping ratio, the damping when analysis and evaluation PSS drops into.
The computing formula of damping ratio is:
In the formula:
N---computation period number;
P
1, P
2---be first and second power peak, See Figure, unit are megawatt (MW);
P
2N+1, P
2N+2---be (2N+1) individual and (2N+2) individual power peak, unit is megawatt (MW)
Get the mean value of a plurality of oscillation period by the following formula frequency:
f＝N/(T
2N+1-T
1)
Wherein,
N---computation period number;
T
1---the time that first peak value occurs, unit is second (s);
T
2N+1---the time that (2N+1) individual peak value occurs, unit is second (s).
Through inspection load disturbance record ripple active power fluctuation number of times, there is the number of oscillation of PSS should obviously be less than the number of oscillation of no PSS, damping ratio (whether greater than 0.1) and adjusting time, the damping when assessing the PSS input.
The generator excitation running status that can also realize of the utility model embodiment shows, according to the current excitation system running status of genset, analyzes the idle deposit nargin of unit.The initial data of this unit are by manual entry, and the later stage should be carried out relevant interface and read from scheduling digitizing support platform.
Common decision is limited by restriction, exciting current and the quiet steady limit and low the encouraging of stator current in generator P/Q running status border, and corresponding bounded is as shown in Figure 9.
Wherein, the restriction of stator current.The loss I that stator current produces in its winding
2R is the reason that heating and winding temperature rise, and therefore by the maximum temperature permissible value, can confirm the maximum allowed current value, and the applied power of generator does
S＝U
tI
t(cosφ+jsinφ)
Wherein φ is a power factor angle, and on the superincumbent P-Q coordinate plane, maximum allowed current can be expressed as a semicircle, and the center of circle is in true origin, and radius equals the applied power of unit.Among the figure, maximum stator current bounded is to be the circle in the center of circle with the initial point, with U
tI
tBe radius.
Maximum exciting current restriction; The loss that exciting current produces in field copper
is the reason that produces heating and winding temperature rising, therefore the exciting current maximal value is also had restriction.Ignore saliency, promptly think x
d=x
qThe time, the restriction of maximum exciting current as shown in the formula:
On the P-Q coordinate plane, above-mentioned equation represent one with
Be the center of circle, with x
AdU
tI
Fd/ x
dCircle for radius.
Low encourage restriction, low to encourage restriction mainly be to surpass restriction for fear of generator stator end heating unshakable in one's determination.Based on different field regulator types, low encourage restrictive curve various ways is arranged, curve 1 representative is broken line type among the figure, curve 2 be a linear pattern, also has circle in addition, need encourage the demonstration that model parameter realizes bounded based on different units low.
Linear model is:
The model of circumference type is:
The model of broken line shape by multistage linear pattern model group altogether.
When voltage not simultaneously, the phase reactive power of advancing of permission is different, so need revise based on voltage levvl.
According to the current running status of unit and P/Q curve and restriction, calculate the nargin of the idle nargin of current unit and the whole network unit.Also should calculate unit idle exert oneself and reference mark voltage before relation.
Show all unit variable signal in real time: set end voltage (kV), stator current (kA), active power (MW), reactive power (MVar), magnetic field voltage (V), field supply (A), PSS ON/OFF and AUTOON/OFF; For three machine excitation systems, also comprise exciter field voltage (V) and field supply (A).In addition, status signal adopts famous value (or perunit value, changeable) to show by the time coordinate curve, and switching signal is used red and Green Marker is distinguished.
The status monitoring picture also possesses the alert event of startup function except that having status display function.When the state variable ratings operation of generator excited system has exceeded normal range of operation, start alert event and record wave process.The working range of each state variable is shown in figure 10.
The system of the utility model; Analysis result according to the excitation property monitoring machine; The PQ curve of unit and the current operating point of unit; Show in real time unit from the nargin of border operating point and from the nargin of control voltage request, through display device with various figure demonstrations such as (histogram, pie charts).
System through the utility model; Make the operation under monitoring in real time of unit side running status; The performance of real embodiment excitation system; And the on-line performance through upper monitoring station calculate can each unit of real-time assessment regulator performance, make that like this unit that can not meet the demands originally is easy to come out, help finding the power supply point of weakness in the electrical network.Also impel power plant that the field regulator performance that can not meet the demands is optimized and transforms through monitoring, make it to adapt to the continuous development of big electrical network.
The become more meticulous Application and Development of analytic system of generator excited system has solved the problems such as safety management of the crash analysis difficulty that exists in the co-ordination of machine net, important performance parameter effectively.
Used specific embodiment in the utility model the principle and the embodiment of the utility model are set forth, the explanation of above embodiment just is used to help to understand the method and the core concept thereof of the utility model; Simultaneously, for one of ordinary skill in the art, according to the thought of the utility model, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as the restriction to the utility model.
Claims (4)
1. a generator excitation system characteristic monitoring system is characterized in that described system comprises: synchronous phasor measuring device, excitation property monitoring main frame and excitation property display device;
Described synchronous phasor measuring device is connected with described excitation property display device through described excitation property monitoring main frame; Wherein,
Described synchronous phasor measuring device is gathered the state variable of described generator excitation system, and the state variable of the generator excitation system of gathering is sent to described excitation property monitoring main frame; Described excitation property monitoring main frame generates Monitoring Data according to the state variable of the generator excitation system of the described synchronous phasor measuring device transmission that receives; Described excitation property display device shows the monitoring result that described excitation property monitoring main frame generates.
2. the system of claim 1 is characterized in that, described excitation property monitoring main frame also comprises:
The generator information-storing device is stored the generator essential information in the described generator excitation system.
3. the system of claim 1 is characterized in that, described excitation property monitoring main frame also comprises:
The model parameter memory storage, storage generator excitation system model parameter.
4. system as claimed in claim 3 is characterized in that, described excitation property monitoring main frame also comprises:
Input media is used to receive said generator essential information, the generator excitation system model parameter of input.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630779A (en) * | 2013-11-22 | 2014-03-12 | 南方电网科学研究院有限责任公司 | Actual measurement method for parameters of brushless excitation system |
| CN105403800A (en) * | 2015-12-30 | 2016-03-16 | 华北电力科学研究院有限责任公司 | Electric power system parameter determination method and device |
| CN105823985A (en) * | 2016-03-11 | 2016-08-03 | 国网新疆电力公司电力科学研究院 | WAMS-dynamic-data-based on-line monitoring and evaluation system for excitation system of generator |
| CN106383311A (en) * | 2016-11-25 | 2017-02-08 | 国网浙江省电力公司电力科学研究院 | Method for online determining generator excitation limitation performance |
| CN106972484A (en) * | 2017-03-31 | 2017-07-21 | 国家电网公司 | Fired power generating unit excitation system dynamic property online evaluation method and apparatus under many scenes |
| CN108802540A (en) * | 2018-07-19 | 2018-11-13 | 山东大学 | Method for visualizing suitable for power distribution network synchronized phasor real-time state monitoring |
| CN111509669A (en) * | 2020-05-08 | 2020-08-07 | 国网山东省电力公司电力科学研究院 | Rotor current protection method and system for synchronous phase modulator |
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2011
- 2011-01-11 CN CN2011200073682U patent/CN202166727U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630779A (en) * | 2013-11-22 | 2014-03-12 | 南方电网科学研究院有限责任公司 | Actual measurement method for parameters of brushless excitation system |
| CN105403800A (en) * | 2015-12-30 | 2016-03-16 | 华北电力科学研究院有限责任公司 | Electric power system parameter determination method and device |
| CN105823985A (en) * | 2016-03-11 | 2016-08-03 | 国网新疆电力公司电力科学研究院 | WAMS-dynamic-data-based on-line monitoring and evaluation system for excitation system of generator |
| CN105823985B (en) * | 2016-03-11 | 2018-06-26 | 国网新疆电力公司电力科学研究院 | A kind of generator excited system on-line monitoring and assessment system based on WAMS dynamic datas |
| CN106383311A (en) * | 2016-11-25 | 2017-02-08 | 国网浙江省电力公司电力科学研究院 | Method for online determining generator excitation limitation performance |
| CN106383311B (en) * | 2016-11-25 | 2018-12-11 | 国网浙江省电力有限公司电力科学研究院 | A kind of online judgment method of generator excitation limiting performance |
| CN106972484A (en) * | 2017-03-31 | 2017-07-21 | 国家电网公司 | Fired power generating unit excitation system dynamic property online evaluation method and apparatus under many scenes |
| CN106972484B (en) * | 2017-03-31 | 2021-04-30 | 国家电网公司 | Method and device for on-line evaluation of dynamic performance of thermal power generating unit excitation system under multiple scenes |
| CN108802540A (en) * | 2018-07-19 | 2018-11-13 | 山东大学 | Method for visualizing suitable for power distribution network synchronized phasor real-time state monitoring |
| CN111509669A (en) * | 2020-05-08 | 2020-08-07 | 国网山东省电力公司电力科学研究院 | Rotor current protection method and system for synchronous phase modulator |
| CN111509669B (en) * | 2020-05-08 | 2022-04-08 | 国网山东省电力公司电力科学研究院 | Rotor current protection method and system for synchronous phase modulator |
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