CN103248071A - Generator set low frequency oscillation monitoring method based on PMU measuring data - Google Patents
Generator set low frequency oscillation monitoring method based on PMU measuring data Download PDFInfo
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Abstract
The invention relates to a generator set low frequency oscillation monitoring method based on PMU measuring data, comprising the following steps of 1) synchronously collecting the dynamic data of each generator by a synchronous phasor measuring unit PMU through the position information of each generator of an electric system provided by a GPS (Global Position System); 2) transmitting the collected data by the PMU to a master station in real time; 3) monitoring the running tendency of a generator set in a real-time updating curve mode by the master station, and if the running tendency has oscillation, automatically pushing the running tendency to an oscillation curve to store the data to a data base; and 4) carrying out low frequency oscillation Prony analysis on power angle data in the dynamic data collected by the PMU through the master station to obtain the amplitude, frequency and damping ratio information of an oscillation signal, and judging the low damping low frequency oscillation according to the oscillation characteristics to provide an important basis for power system stabilizer (PSS) damping compensation. Compared with the prior art, the method has the advantages that the influence of low frequency oscillation on the system can be effectively detected and the like.
Description
Technical field
The present invention relates to a kind of generating set low-frequency oscillation monitoring method, especially relate to a kind of generating set low-frequency oscillation monitoring method based on the PMU metric data.
Background technology
Waving relatively between generator amature can take place in generators in power systems under disturbance when the power transmission line paired running, and cause persistent oscillation when lacking damping.At this moment, electric power and merit angle vibrate between generator, and power also corresponding vibration can take place on the power transmission line, and when vibration was serious, system can not keep synchronous operation, stability disruption.Because other frequencies of oscillation are very low, are generally 0.2～2.5Hz, so be called low-frequency oscillation (being called power oscillation again, electromechanical oscillations).Low-frequency oscillation generally has two kinds of patterns: when interconnection is more weak, frequency of oscillation is lower, for example in 0.2～0.5Hz scope, be called the interregional oscillation mode of interconnected systems (interarea mode), the harmfulness of this vibration is bigger, it be an a part of group of planes with respect to the vibration of another part group of planes, propagate to total system by interconnection once the generation meeting; If the unit electrical distance is less, then frequency of oscillation is higher, for example more than the 1Hz, is called the oscillation mode (localmode or plant mode) between unit in this locality or the zone, and this vibration is confined in the zone, and is less with respect to the former coverage.
Low-frequency oscillation of electric power system all has generation at home and abroad, and this low-frequency oscillation or power oscillation often appear on long distance, the heavy load power transmission line, adopt modern fast, easier generation under the condition of high limited value multiple excitation system.At the power system development initial stage, the steady stability problem is usually expressed as non-same period of the step-out between generator and system.But along with the expansion of system, this shakiness is permanent to show as amplification type vibration between the generator (or electric power generator group), the interconnection of interconnected systems show particularly outstanding.
1969, the concept of utilization damping torques such as F.P.Demello has been carried out Analysis on Mechanism and explanation to the reason that one machine infinity bus system produces low-frequency oscillation, point out to produce in the electric power system low-frequency oscillation that continue or amplification, its basic reason is owing to produced effect of negative damping in the system, offset the intrinsic positive damping of system, made the total damping of system very little or be negative value.This makes people be greatly improved to the understanding of low-frequency oscillation, and later research work is carried out mostly on this basis, is exactly that one machine infinity bus system is in notional popularization basically as the Analysis on Mechanism for the multimachine system low-frequency oscillation.The vibration of a plurality of different frequencies can appear in a multimachine system, and the vibration of each frequency is called a low frequency oscillation mode, is also referred to as the electromechanical oscillations pattern.This oscillation mode is relevant with electromagnetic circuit with the generator amature motion, just because the inertia ratio of generating set is bigger, therefore shows as low frequency characteristic.It is generally acknowledged that in the system that a n platform generator is formed corresponding electromechanical oscillations pattern has n-1, but only be concerned about the pattern of negative damping and underdamping usually.F.P.Demell thinks that every unit or inertia group all can have leading role to one or more oscillation modes, the damping of certain unit, can produce leading influence to some specific oscillation mode, Here it is has " correlation properties " of material impact or claims " decoupling zero relation " afterwards research.
The low-frequency oscillation underdamping mechanism that Here it is is generally admitted at present, namely the effect of negative damping that system provides under some particular case has been offset the positive damping of aspects such as system motor, excitation winding and machinery, makes system's total damping very little or for negative.When system was disturbed under the negative damping operating mode, disturbance was exaggerated gradually, and then caused the low-frequency oscillation of power.The excitation system of heavy load circuit, modern quick-response excitation and high limited value multiple is to cause system the main cause of negative damping to occur.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of generating set low-frequency oscillation monitoring method based on the PMU metric data for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of generating set low-frequency oscillation monitoring method based on the PMU metric data is characterized in that this method comprises the steps:
(1) synchronous phasor measurement unit PMU utilizes the positional information of each generator of electric power system that gps system provides, and each generator dynamic data is gathered synchronously;
(2) PMU is sent to main website with the data in real time that collects;
(3) main website monitors the operation trend of generating set with the curve mode of real-time update, if vibration appears in above-mentioned operation trend, and propelling movement trend oscillating curve automatically, and data are saved to database;
(4) the merit angular data in main website the dynamic data that PMU is collected is carried out low-frequency oscillation Prony and is analyzed, draw amplitude, frequency and the damping ratio information of oscillator signal, and carry out the judgement of underdamping low-frequency oscillation according to these oscillation characteristicses, for power system stabilizer, PSS PSS damping compensation provides important basis.
Described dynamic data comprises merit angle, active power, reactive power, voltage and frequency.
Described operation trend comprises the performance graph of active power, reactive power, voltage and frequency.
Compared with prior art, the present invention has effective detection low-frequency oscillation to the influence of system, fail safe and the reliability of system have been improved, adopt the Prony algorithm that the merit angular data is analyzed simultaneously, therefrom analyze the information such as amplitude, phase place, damping factor, frequency of signal, and need not from frequency domain response to ask, amount of calculation greatly reduces.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.
A kind of generating set low-frequency oscillation monitoring method based on the PMU metric data, this method comprises the steps:
(1) synchronous phasor measurement unit PMU utilizes the positional information of each generator of electric power system that gps system provides, and each generator dynamic data is gathered synchronously;
(2) PMU is sent to main website with the data in real time that collects;
(3) main website monitors the operation trend of generating set with the curve mode of real-time update, if vibration appears in above-mentioned operation trend, and propelling movement trend oscillating curve automatically, and data are saved to database;
(4) the merit angular data in main website the dynamic data that PMU is collected is carried out low-frequency oscillation Prony and is analyzed, draw amplitude, frequency and the damping ratio information of oscillator signal, and carry out the judgement of underdamping low-frequency oscillation according to these oscillation characteristicses, for power system stabilizer, PSS PSS damping compensation provides important basis.
Described dynamic data comprises merit angle, active power, reactive power, voltage and frequency.
Described operation trend comprises the performance graph of active power, reactive power, voltage and frequency.
Described merit angular data method of measurement has: 1) indirect measurement method, 2) utilize the generator speed signal measurement.
Described indirect measurement method is terminal voltage and the end electric current of gathering generator in real time, relends the position that the model that helps generator calculates rotor.The described generator speed signal measurement that utilizes refers to utilize tachometer to measure the merit angle in real time.
Described Prony method is that the linear combination with a class index item comes match equal interval sampling data.Described exponential term comprises amplitude and two parts of exponential factor.Detailed process is: at first utilize and go direct current and low pass filter that original data sequence is carried out preliminary treatment, described low pass filter can be selected suitable filters according to the performance index that provide in advance, utilizes resampling then and selects sequence length further to reduce the influence of noise.
Claims (3)
1. the generating set low-frequency oscillation monitoring method based on the PMU metric data is characterized in that this method comprises the steps:
(1) synchronous phasor measurement unit PMU utilizes the positional information of each generator of electric power system that gps system provides, and each generator dynamic data is gathered synchronously;
(2) PMU is sent to main website with the data in real time that collects;
(3) main website monitors the operation trend of generating set with the curve mode of real-time update, if vibration appears in above-mentioned operation trend, and propelling movement trend oscillating curve automatically, and data are saved to database;
(4) the merit angular data in main website the dynamic data that PMU is collected is carried out low-frequency oscillation Prony and is analyzed, draw amplitude, frequency and the damping ratio information of oscillator signal, and carry out the judgement of underdamping low-frequency oscillation according to these oscillation characteristicses, for power system stabilizer, PSS PSS damping compensation provides important basis.
2. a kind of generating set low-frequency oscillation monitoring method based on the PMU metric data according to claim 1 is characterized in that described dynamic data comprises merit angle, active power, reactive power, voltage and frequency.
3. a kind of generating set low-frequency oscillation monitoring method based on the PMU metric data according to claim 2 is characterized in that described operation trend comprises the performance graph of active power, reactive power, voltage and frequency.
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| CN104833878A (en) * | 2015-04-30 | 2015-08-12 | 国电南瑞科技股份有限公司 | Electric power system power oscillation judgment method based on synchronized phasor measurement unit |
| CN104865497A (en) * | 2015-04-30 | 2015-08-26 | 国电南瑞科技股份有限公司 | Low-frequency oscillation on-site online identification method based on extended Prony algorithm |
| CN106443246A (en) * | 2016-09-06 | 2017-02-22 | 山东大学 | Online identification method of small-disturbance stability parameters based on PMU measurement data |
| CN110661261A (en) * | 2019-10-09 | 2020-01-07 | 国家电网公司西北分部 | PMU data processing method and device for low-frequency oscillation online analysis |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833878A (en) * | 2015-04-30 | 2015-08-12 | 国电南瑞科技股份有限公司 | Electric power system power oscillation judgment method based on synchronized phasor measurement unit |
| CN104865497A (en) * | 2015-04-30 | 2015-08-26 | 国电南瑞科技股份有限公司 | Low-frequency oscillation on-site online identification method based on extended Prony algorithm |
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| CN106443246A (en) * | 2016-09-06 | 2017-02-22 | 山东大学 | Online identification method of small-disturbance stability parameters based on PMU measurement data |
| CN106443246B (en) * | 2016-09-06 | 2019-03-22 | 山东大学 | The on-line identification method of small interference stability parameter based on PMU metric data |
| CN110661261A (en) * | 2019-10-09 | 2020-01-07 | 国家电网公司西北分部 | PMU data processing method and device for low-frequency oscillation online analysis |
| CN110661261B (en) * | 2019-10-09 | 2021-05-28 | 国家电网公司西北分部 | PMU data processing method and device for low-frequency oscillation online analysis |
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