CN106655123A - Subsynchronous/super-synchronous oscillation monitoring protection apparatus and oscillation monitoring protection method - Google Patents
Subsynchronous/super-synchronous oscillation monitoring protection apparatus and oscillation monitoring protection method Download PDFInfo
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- CN106655123A CN106655123A CN201611244784.8A CN201611244784A CN106655123A CN 106655123 A CN106655123 A CN 106655123A CN 201611244784 A CN201611244784 A CN 201611244784A CN 106655123 A CN106655123 A CN 106655123A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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Abstract
The invention discloses a subsynchronous oscillation monitoring protection apparatus and a subsynchronous oscillation monitoring protection method. According to the apparatus, oscillation frequency is obtained by performing online recognition on subsynchronous oscillation signals in instantaneous power on each current collection line in a new energy station, and each collecting inlet line and outlet line in a new energy collection station; then voltage and current subsynchronous/super-synchronous components in each line are extracted through filtering design; three kinds of protection elements for performing subsynchronous/super-synchronous oscillation impedance protection, subsynchronous/super-synchronous harmonic current protection and subsynchronous power oscillation protection are further provided specific to the extracted subsynchronous/super-synchronous components, wherein the subsynchronous/super-synchronous oscillation impedance protection is main protection; the subsynchronous/super-synchronous harmonic current protection and the subsynchronous power oscillation protection are backup protection; and therefore, the apparatus can perform protection to rapidly cut off a disturbance source in subsynchronous oscillation so as to safeguard safe and stable operation of the system.
Description
Technical field
The invention belongs to power system stability and control technical field, and in particular to a kind of to be applied to the secondary of new forms of energy access
Synchronized oscillation monitoring and protecting device and guard method, when new forms of energy are accessed and produce sub-synchronous oscillation disturbing source is quickly cut off, and is protected
The safety of barrier system.
Background technology
New forms of energy development with wind-powered electricity generation, photovoltaic as representative is swift and violent, and some areas new forms of energy power supply installed capacity has exceeded total
The 30% of installed capacity.By to the end of the year 2014,95,810,000 kilowatts of grid connected wind power installed capacity, increase by 25.6%；The grid-connected sun
26,520,000 kilowatts of capacity of installed generator of energy, increases by 67.0%.
According to China Electricity Council, it is expected that China is still within industrializing advanced stage to primary before the year two thousand twenty
During the advanced economy stage makes the transition, electricity needs will keep annual 5～6% growth.Expect " 13 " latter stage
(the year two thousand twenty) whole nation electrical demand is up to 7～8,000,000,000,000 kilowatt hours or so, 1,800,000,000 kilowatts of total capacity of installing, wherein wind-powered electricity generation installation
200,000,000 kilowatts are reached, photovoltaic installation reaches 100,000,000 kilowatts or so.The year two thousand fifty is expected, China's total installation of generating capacity can reach 4,300,000,000 thousand
Watt, wherein 1,500,000,000 kilowatts of wind-powered electricity generation and photovoltaic generation account for 34.9%.
However, manage different and grid-connected adopted power electronics equipment due to new forms of energy power generator may cause to put
Big subsynchronous harmonic wave, sub-synchronous oscillation phenomenon is even resulted in when AC system is weaker；Wind-powered electricity generation, photovoltaic and reactive-load compensation simultaneously is filled
Put and intercouple, it is also possible to collect area on a large scale in new forms of energy station and excite sub-synchronous oscillation；If further the harmonic wave is frequently
Rate is complementary with generator shafting nature frequency of oscillation, then can further cause the sub-synchronous oscillation of fired power generating unit.
On July 1st, 2015, the common wasted power 1,280,000 thousand of Xinjiang power plant shafting torsional oscillation protection (TSR) successive relay trip tripping operation
Watt；After unit tripping, state adjusts central emergency that dc power in day is down to into 3,000,000 kilowatts by 4,500,000 kilowatts.Crash analysis afterwards
Show, be the reason for cause this sub-synchronous oscillation due to a large amount of new forms of energy collect in introduce in electrical network it is substantial amounts of subsynchronous humorous
Ripple, the harmonic frequency and the natural frequency of oscillation mutual added time of generator shafting, electro-machanical torsional oscillation interaction phenomenon is caused to be sent out
Life, i.e. sub-synchronous oscillation.Importantly, the formation mechenism of the sub-synchronous oscillation is inconsistent with conventional electric power system, be due to
What the subsynchronous harmonic wave that a large amount of new forms of energy collect introducing was caused, existing protection is no longer suitable for control method.
The content of the invention
It is an object of the invention to provide a kind of subsynchronous/supersynchronous vibration monitoring and protecting device for being applied to new forms of energy access
And subsynchronous/supersynchronous vibration monitoring protection method, to tackle the sub-synchronous oscillation that new forms of energy access system is caused to system
Risk.
Subsynchronous/supersynchronous vibration monitoring and protecting device may be mounted at wind energy turbine set can also collect station installed in wind-powered electricity generation
Use.Installed in wind energy turbine set, device is acquired to wind energy turbine set collection electric wire, mainly accesses the three-phase phase voltage and three of each collection electric wire
Phase phase current.Collect station installed in wind-powered electricity generation, device collects each circuit three-phase phase voltage from each wind energy turbine set at station to access
It is monitored with three-phase phase current.The defencive function of device mainly realizes in design three kinds of protection elements：Harmonic impedance is protected
Element, harmonic current protection element and oscillation of power protection element.Complete protection is realized by these three protection elements
Function.The impedance protection function in line last synchronization/supersynchronous frequency band is mainly realized in harmonic impedance protection, by impedance operator
Quickly determine whether it is disturbing source, so as to quickly cut off disturbing source；Harmonic current protection element to when system vibrates,
By the order of severity of the amplitude size identification vibration of harmonic current in subsynchronous/supersynchronous frequency band, can not expire in impedor
Oscillator circuit is cut off during sufficient operation condition；The instantaneous power that oscillation of power protection element passes through calculating circuit, recognizes instantaneous power
The content of upper each subsynchronous harmonic wave, if vibration exceedes certain amplitude, cuts off the oscillator circuit.Meanwhile, sub-synchronous oscillation
Monitoring and protecting device provides order excision mechanism when a plurality of circuit will cut off, and can manually arrange the important of each bar circuit
Property, it is also possible to excision order is determined based on flow situations, so as to realize reducing the impact because cutting off circuit to system as far as possible.
The application is specifically employed the following technical solutions：
A kind of subsynchronous/supersynchronous vibration monitoring and protecting device, the sub-synchronous oscillation monitoring and protecting device is applied to newly
The energy is accessed, and installed in wind-powered electricity generation station or wind energy turbine set are collected, and sub-synchronous oscillation monitoring and protecting device includes analog acquisition unit
(AI), processing unit (CPU), motor unit (TRIP) are protected, it is characterised in that：
Three-phase phase voltage, the three-phase phase current signal of analog quantity unit (AI) collection monitoring circuit, and guarantor will be sent in data
Shield processing unit (CPU), protection processing unit (CPU) calculates whether each circuit occurs subsynchronous/supersynchronous vibration, calculates each line
Whether road produces protection signal, according to route protection tripping operation order setting mechanism, sends to motor unit (TRIP) successively
Trip command, by motor unit (TRIP) according to the trip command corresponding line switching of tripping in order.
The present invention further includes following preferred version：
Subsynchronous/supersynchronous vibration monitoring and protecting device also includes administrative unit (MASTER) and signal element
(DO)；
Wherein, signal element (DO) sends as sub-synchronous oscillation monitoring and protecting device trip command, sub-synchronous oscillation
The signal output interface of monitoring and protecting self-check of device error event, accesses other monitoring systems and is observed；
Administrative unit (MASTER) realizes the external communication interface of sub-synchronous oscillation monitoring and protecting device, using standard
61850 Ethernet interfaces.
Protection processing unit (CPU) includes that the protection module of each bar circuit of correspondence and route protection tripping operation order are determined
Plan module；
The protection module of each bar circuit of correspondence realizes respectively subsynchronous/supersynchronous vibration identification to each circuit, calculates each
Whether circuit produces protection signal, and sends protection signal to route protection tripping operation Sequential Decision module, by line
Road trip protection Sequential Decision module determines the tripping operation order of each bar circuit.
The protection module of each bar circuit of correspondence includes harmonic impedance protection element, oscillation of power protection element harmonic electricity
Stream protection element, the protection module calculates respectively the operating criterion whether corresponding line meets above-mentioned 3 protection elements, meets
Any of which one, the protection module all can send the protection act letter of the circuit to route protection tripping operation Sequential Decision module
Number.
In the protection module of each bar circuit of correspondence, harmonic impedance protection element is used as main protection, harmonic current protection unit
Part is second level back-up protection, and oscillation of power protection element is third level back-up protection.
Route protection tripping operation Sequential Decision module determines each circuit for sending route protection action signal according to setting mechanism
Tripping operation order, and to motor unit (TRIP) send trip command successively；
Wherein, the setting mechanism includes optionally being manually set mechanism and automatic Load flow calculation mechanism：
The mechanism of being manually set is suitable to determine the tripping operation of circuit according to the significance level order of each bar circuit being manually set
Sequence；
Automatically Load flow calculation mechanism refers to the power frequency power for calculating each bar circuit, true from little to big sequence according to power frequency power
Determine line tripping order.
The application further comprises a kind of sub-synchronous oscillation monitoring and protecting using aforementioned sub-synchronous oscillation monitoring and protecting device
Method：
A kind of sub-synchronous oscillation monitoring protection method, subsynchronous/supersynchronous vibration monitoring protection method is applied to newly
The energy is accessed；Characterized in that, the sub-synchronous oscillation monitoring protection method is comprised the steps of：
(1) gather each bar collection electric wire or each wind energy turbine set accesses three-phase voltage, the three-phase current signal for collecting station track road；
(2) calculate each collection electric wire or each wind energy turbine set is accessed and collects the instantaneous power on station track road, and instantaneous power is carried out soon
Fast Fourier transformation, recognizes the power magnitude under the frequency of oscillation and corresponding frequency of oscillation in instantaneous power, determines whether
There is circuit that subsynchronous/supersynchronous vibration occurs；
(3) according to the frequency of power oscillation calculated in step (2), bandpass filter is selected, generation time is judged to step (2)
The three-phase voltage and three-phase current of synchronization/supersynchronous oscillator circuit is filtered respectively process, obtains the circuit difference oscillation frequency
Real-time oscillation data under rate, including A/B/C it is subsynchronous/supersynchronous electric current instantaneous value, A/B/C phases are subsynchronous/supersynchronous voltage
Instantaneous value；；
(4) calculate respectively in subsynchronous/supersynchronous duration of oscillation circuit power frequency power change values, fallen into a trap according to step (2)
Subsynchronous/supersynchronous corresponding instantaneous power the amplitude of frequency for calculating and subsynchronous/supersynchronous duration of oscillation circuit power frequency power
Changing value, judges the whether action of oscillation of power protection element；
(5) subsynchronous/supersynchronous vibration point in three-phase voltage, the three-phase current of filtered acquisition in step (3)
Amount, calculates respectively phase of impedance of the oscillator circuit under subsynchronous/supersynchronous frequency of oscillation, judges that harmonic impedance protection element is
No action；
(6) subsynchronous/supersynchronous oscillating component in the three-phase current of filtered acquisition in step (3) is counted in real time
According to, the oscillation amplitude under different frequencies of oscillation is calculated, the size and duration according to oscillating current amplitude judges harmonic wave electricity
Stream protection element whether action；
(7) each circuit that subsynchronous/supersynchronous vibration occurs is protected according to this line power vibration obtained by step (4)-(6)
Protection element, harmonic impedance protection element, the harmonic current protection element whether judged result of action, it is determined whether send circuit guarantor
Shield action signal is circuit excision signal；
(8) for all each bar circuits for sending route protection action signal, according to setting mechanism, tripping operation successively cuts off phase
Answer circuit.
The present invention is that a kind of sub-synchronous oscillation monitoring protection method still further comprises following preferred version：
In step (2), fast Fourier FFT data window selection selects the data window of 1s.
In step (4), the operation condition of oscillation of power protection element is：
Psub(k)≥Pset, Tp(k)≥Tp_setAnd Δ Pave＜ Δ Pave_set；
Wherein：
PsubK () is the corresponding instantaneous power amplitude of k-th subsynchronous/supersynchronous frequency of oscillation；
TpK () is Psub(k)≥PsetDuration, Tp_setFor oscillation of power guard time definite value, (span is 12
～20s)；
PsetTo set threshold value, span is subsynchronous/supersynchronous oscillator circuit occurs 1%～2% specified work(
Rate；
ΔPaveFor circuit power frequency power change values；
ΔPave_setFor power frequency power variation threshold value, span is that subsynchronous/supersynchronous oscillator circuit occurs
2%～5% rated power.
In step (3), the centre frequency interval 1Hz of all bandpass filters, passband width is 1Hz, for step (2)
K-th subsynchronous/supersynchronous frequency of oscillation f for picking outssoK (), the online frequency that is loaded into is f0-fsso(k) and f0+fsso(k)
Bandpass filter, wherein f0For work frequency fsso(k) be k-th subsynchronous/supersynchronous frequent rate, the three-phase of same circuit
Phase voltage and three-phase phase current pass sequentially through the bandpass filter of all oscillation modes, obtain in each phase voltage, electric current and own
Subsynchronous crossover rate f0-fsso(k) corresponding voltage, current component and supersynchronous frequency f0+fsso(k) corresponding voltage, electric current point
Amount；Design of Bandpass is deviateing passband central frequency 2Hz, and decay 40dB.
In step (5), respectively calculate circuit subsynchronous/supersynchronous frequency of oscillation under three-phase phase of impedance
Harmonic impedance protection element operation condition is need to simultaneously to meet following two conditions：
Three-phase phase of impedanceIn have two-phase and above real part for negative or have two-phase and above imaginary part to be negative；
The circuit three-phase currentIn arbitrary phasor amplitude be more than action threshold value IR_set(span is
There is the 0.5%～1% of subsynchronous/supersynchronous oscillator circuit rated current), TRK () is that electric current is more than IR_setIt is lasting when
Between, TR_setFor harmonic impedance guard time definite value, span is 3～8s.
In step (6), the operation condition of harmonic current protection element is：
Arbitrary phase harmonic current is more than Ii_set, and the duration is more than Ti_set,
Wherein, Ii_setFor the harmonic current threshold value that sets, (span is that subsynchronous/supersynchronous oscillator circuit occurs
1%～2% rated power；)；Ti_tesFor the harmonic current time definite value that sets, (span is 8～12s；)；
In step (7), harmonic impedance protection element is second level standby guarantor as main protection, harmonic current protection element
Shield, oscillation of power protection element is third level back-up protection.The wherein actuation time of harmonic impedance protection element is most short and small in humorous
The actuation time of ripple overcurrent protection element, the actuation time of harmonic current protection element is less than the action of oscillation of power protection element
Time.
In step (8), when there is a plurality of circuit to send protection signal, according to according to setting mechanism, trip successively
Excision respective lines, the setting mechanism refers to the mechanism of being manually set, that is, be manually set the significance level order of each bar circuit, presses
Cut off the circuit that sends protection signal successively according to the backward of importance, until complete resection finish or circuit it is subsynchronous/
Supersynchronous vibration disappears and respective lines protection signal is returned.
In step (8), when there is a plurality of circuit to send protection signal, according to according to setting mechanism, trip successively
Excision respective lines, the setting mechanism refers to automatic Load flow calculation mechanism, that is, the power frequency power of each bar circuit is calculated, according to work
Frequency power starts excision, until complete resection is finished or circuit from the minimum circuit of power frequency power successively from little to big sequence
Subsynchronous/supersynchronous vibration disappears and respective lines protection signal is returned..
The application has the advantages that：
Present applicant proposes a kind of subsynchronous/supersynchronous vibration monitoring and protecting device for being applied to new forms of energy access and secondary same
Step vibration monitoring protection method, relative to existing grid side for sub-synchronous oscillation is only in accordance with the protection of oscillation amplitude non-selectivity
For control measure, what is can become more meticulous accomplishes Location perturbation source, disturbing source is cut off, in the safe and stable operation of both safeguards systems
In the case of, and the risk that new forms of energy unit is cut off by mistake is reduced as far as possible, there is very important realistic meaning.
Description of the drawings
Fig. 1 be the application it is subsynchronous/it is supersynchronous vibration monitoring and protecting device structured flowchart；
Fig. 2 be the application it is subsynchronous/it is supersynchronous vibration monitoring protection method schematic flow sheet；
Fig. 3 is the application line tripping sequential logic schematic diagram.
Specific embodiment
With reference to Figure of description to technical scheme be embodied as be described in further detail.
Subsynchronous/supersynchronous vibration monitoring and protecting apparatus function structure chart is as shown in figure 1, wherein analog quantity unit (AI) is adopted
The three-phase phase voltage of monitor set circuit, three-phase phase current signal, and protection processing unit CM, CM will be sent in data to calculate instantaneous work(
Rate is simultaneously recognized to harmonic frequency, and process is filtered to circuit three-phase voltage, current signal according to frequency estimation result, is obtained
The data of acquisition are analyzed afterwards by subsynchronous/supersynchronous component in obtaining current, voltage, power, the protection of Jing harmonic impedances
Element, harmonic current protection element and hunting power protection element, judge whether to cut off circuit, last comprehensive all circuits
Action message, according to the excision mechanism that is manually set in advance or according to automatic trend mechanism sequentially-operating instruction is sent, by moving
Make unit (TRIP) and tripping line switching is gone according to action command.Signal element (DO) is dynamic for the protection that device occurs in figure
The events such as work, self-inspection error provide the contact of correlation, are observed to access other monitoring systems.Administrative unit (MASTER)
The management of external communication interface and recorded wave file is realized, using 61850 Ethernet interfaces of standard.
It is as shown in Figure 2 a kind of subsynchronous/supersynchronous vibration monitoring for being applied to new forms of energy access disclosed by the invention
The handling process of protection device defencive function is comprised the following steps：
(1) device collects the circuit three-phase voltage at station, three-phase current and is acquired to the access of each bar wind energy turbine set, sample frequency
For 1200Hz, all analog quantity channel synchronized samplings；
(2) instantaneous power of each bar circuit is calculated with the sampled point of 1200Hz sample frequencys, the data window of 1s is then chosen
Calculating Fourier transformation is carried out, frequency of oscillation and amplitude in the subsynchronous frequency in instantaneous power is recognized, so that it is determined that circuit
Currently whether vibrate, Fourier transformation is calculated using discrete Fourier transform, and specific formula for calculation is as follows：
Wherein：N=1200；
TsFor sample frequency, 1200Hz is taken；
K is overtone order, and computer capacity is 5～45；
(3) frequency of oscillation in a certain bar circuit instantaneous power selects different bandpass filters, to the circuit three
Phase voltage and three-phase current are filtered respectively process, obtain the real-time oscillation data under the circuit difference frequency of oscillation, band logical
The design of wave filter is joined by the way of tabling look-up in order to adaptive frequency changes and improves the computing capability of device to wave filter
Number carries out the bandpass filter coefficient that storing frequencies scope is 5Hz～45Hz, and the Z domains expression format of wave filter is：
Wherein N (z), D (z) are the multinomial of operator z, i.e.,：
N (z)=bmzm+bm-1z(m-1)+...+b1z+b0；
D (z)=amzm+am-1z(m-1)+...+a1z+a0；
So that centre frequency is as 5Hz as an example, passband width is 1Hz, and m unifications take 5, then its packing coefficient is：
[10.5811141289120e-003, -71.8451679981765e-003,199.556371100672e-003,
- 271.311026351323e-003,127.721330104613e-003,142.621058250939e-003,
- 271.423985741603e-003,191.059425476604e-003, -66.4348295925944e-003,
9.47571062195649e-003,8.45678532126587e-003,6.358695631323e-003]；
Front 6 coefficients are numerator coefficients, and afterwards 6 coefficients are denominator coefficients, are all arranged according to the drop power of m.
(4) subsynchronous/supersynchronous oscillating component in the three-phase current of filtered acquisition in step (3) is counted in real time
According to, the power magnitude under different frequencies of oscillation is calculated, and oscillation of power protection element judgement is carried out to it.Wherein harmonic power is protected
Shield definite value is set as：
Oscillation of power protection act definite value：10MW；
Oscillation of power guard time definite value：10s
I.e.：Whether subsynchronous/supersynchronous oscillating component amplitude in instantaneous power is judged more than definite value 10MW, and when continuing
Between whether be more than 10s, if two conditions all meet, device sends harmonic power protection signal.
(5) subsynchronous/supersynchronous vibration point in three-phase voltage, the three-phase current of filtered acquisition in step (3)
Amount, calculates respectively phase of impedance of the oscillator circuit under subsynchronous/supersynchronous frequency of oscillation and carries out harmonic impedance protection element
Judge, wherein harmonic impedance protection definite value is set as：
Harmonic impedance protection act resistance definite value：-0.05Ω；
Harmonic impedance protection act reactance definite value：-0.1Ω；
Harmonic impedance guard time definite value：5s；
Harmonic impedance protective current definite value：5A；
By taking the actually track data of vibration as an example, the voltage harmonic phasor and current harmonics phasor for calculating is respectively：
Then
In the same manner, B, C phase resistance reactance for calculating is respectively：
Rb=-1.50-j5.85 Ω, Rc=-1.53-j5.89 Ω
Due toWithIt is basically identical, the feature of negative resistance and capacitive is presented, while IaAmplitude more than 5A's
Duration has reached 5s, therefore can be determined that oscillator circuit for disturbing source, according to harmonic impedance criterion, sends protection dynamic
Make signal.
(6) subsynchronous/supersynchronous oscillating component in the three-phase current of filtered acquisition in step (3) is counted in real time
According to, the current amplitude under different frequencies of oscillation is calculated, the size and duration according to oscillating current amplitude carries out harmonic wave electricity
Stream protection element judges that wherein harmonic current components definite value is set as：
Harmonic current protection act current ration：10A；
Harmonic current guard time definite value：8s；
I.e.：Judge IaAmplitude whether be more than definite value 10A, if greater than protection act definite value and the duration reaches
8s, then send harmonic current protection signal.
(7) all circuits of access system are carried out with (4)-(6) judgement, the judgement to three protection elements in same circuit
As a result carry out or operate, i.e., arbitrary protection element action in circuit, the circuit is removed；
(8) according to flow process shown in Fig. 3, the action message of comprehensive all circuits cuts off logic or tide according to setting order
Stream situation is with this excision circuit.By taking sequence of current excision as an example：
Device accesses 6 circuits and carries out monitoring enforcement protection, and this six circuits are divided into 6 wheel actions, every time only excision one
Circuit, the instantaneous power of each bar circuit of device monitoring to circuit 1, circuit 2, circuit 3, circuit 4, circuit 5, circuit 6 is respectively：
20MW, 40MW, 70MW, 50MW, 70MW, 80MW, now, the protection element action of circuit 1,2,5 then judges 1,2,5 three, circuit
The flow situations of circuit, according to the principle of the minimum circuit of excision power, then cut off circuit 1, while circuit 2, circuit 5 are put into down
One wheel carries out again judgement excision.
Applicant describes in detail to embodiments of the invention with reference to Figure of description and describes, but this area skill
It should be understood that above example is only the preferred embodiments of the invention, explanation in detail is intended merely to help reader art personnel
More fully understand that the present invention is spiritual, and not limiting the scope of the invention, conversely, any invention essence based on the present invention
Any improvement or modification that god is made all should fall within the scope and spirit of the invention.
Claims (18)
1. a kind of subsynchronous/supersynchronous vibration monitoring and protecting device, the sub-synchronous oscillation monitoring and protecting device is applied to new energy
Source is accessed, and installed in wind-powered electricity generation station or wind energy turbine set are collected, and sub-synchronous oscillation monitoring and protecting device includes analog acquisition unit
(AI), processing unit (CPU), motor unit (TRIP) are protected, it is characterised in that：
Three-phase phase voltage, the three-phase phase current signal of analog quantity unit (AI) collection monitoring circuit, and will give at protection in data
Reason unit (CPU), protection processing unit (CPU) calculates whether each circuit occurs subsynchronous/supersynchronous vibration, and calculating each circuit is
No generation protection signal, according to route protection tripping operation order setting mechanism, sends tripping operation to motor unit (TRIP) successively
Instruction, by motor unit (TRIP) according to the trip command corresponding line switching of tripping in order.
2. it is according to claim 1 it is subsynchronous/it is supersynchronous vibration monitoring and protecting device, it is characterised in that：
The sub-synchronous oscillation monitoring and protecting device also includes administrative unit (MASTER) and signal element (DO)；
Wherein, signal element (DO) sends as sub-synchronous oscillation monitoring and protecting device trip command, sub-synchronous oscillation monitoring
The signal output interface of protection device self-inspection error event, accesses other monitoring systems and is observed；
Administrative unit (MASTER) realizes the external communication interface of sub-synchronous oscillation monitoring and protecting device, using the 61850 of standard
Ethernet interface.
3. it is according to claim 1 and 2 it is subsynchronous/it is supersynchronous vibration monitoring and protecting device, it is characterised in that：
Protection processing unit (CPU) includes the protection module of each bar circuit of correspondence and route protection tripping operation Sequential Decision mould
Block；
The protection module of each bar circuit of correspondence realizes respectively subsynchronous/supersynchronous vibration identification to each circuit, calculates each circuit
Protection signal whether is produced, and sends protection signal to route protection tripping operation Sequential Decision module, protected by circuit
Shield tripping operation Sequential Decision module determines the tripping operation order of each bar circuit.
4. it is according to claim 3 it is subsynchronous/it is supersynchronous vibration monitoring and protecting device, it is characterised in that：
The protection module of each bar circuit of correspondence includes that harmonic impedance protection element, oscillation of power protection element harmonic electric current are protected
Protection element, the protection module calculates respectively the operating criterion whether corresponding line meets above-mentioned 3 protection elements, meets wherein
Any one, the protection module all can send the protection signal of the circuit to route protection tripping operation Sequential Decision module.
5. it is according to claim 4 it is subsynchronous/it is supersynchronous vibration monitoring and protecting device, it is characterised in that：
In the protection module of each bar circuit of correspondence, harmonic impedance protection element is as main protection, harmonic current protection element
Second level back-up protection, oscillation of power protection element is third level back-up protection.
6. it is according to claim 3 it is subsynchronous/it is supersynchronous vibration monitoring and protecting device, it is characterised in that：
Route protection tripping operation Sequential Decision module determines each line tripping for sending route protection action signal according to setting mechanism
Sequentially, and successively trip command is sent to motor unit (TRIP)；
Wherein, the setting mechanism includes optionally being manually set mechanism and automatic Load flow calculation mechanism：
The mechanism of being manually set be according to each bar circuit being manually set significance level order come determine circuit tripping operation order；
Automatically Load flow calculation mechanism refers to the power frequency power for calculating each bar circuit, and line is determined from little to big sequence according to power frequency power
Road tripping operation order.
7. a kind of subsynchronous/supersynchronous vibration monitoring protection method, subsynchronous/supersynchronous vibration monitoring protection method application
Access in new forms of energy, it is characterised in that subsynchronous/supersynchronous vibration monitoring protection method is comprised the steps of：
(1) gather each bar collection electric wire or each wind energy turbine set accesses three-phase voltage, the three-phase current signal for collecting station track road；
(2) calculate each collection electric wire or each wind energy turbine set is accessed and collects the instantaneous power on station track road, and quick Fu is carried out to instantaneous power
In leaf transformation, recognize instantaneous power in frequency of oscillation and corresponding frequency of oscillation under power magnitude, determine whether wired
There is subsynchronous/supersynchronous vibration in road；
(3) according to the frequency of power oscillation calculated in step (2), bandpass filter is selected, generation time is same is judged to step (2)
The three-phase voltage and three-phase current of step/supersynchronous oscillator circuit is filtered respectively process, obtains the circuit difference frequency of oscillation
Under real-time oscillation data, including three-phase it is subsynchronous/supersynchronous electric current, three-phase is subsynchronous/supersynchronous voltage；
(4) calculate respectively in subsynchronous/supersynchronous duration of oscillation circuit power frequency power change values, according to calculating in step (2)
Subsynchronous/supersynchronous corresponding instantaneous power amplitude of frequency and subsynchronous/supersynchronous duration of oscillation circuit power frequency changed power
Value, judges the whether action of oscillation of power protection element；
(5) subsynchronous/supersynchronous oscillating component in three-phase voltage, the three-phase current of filtered acquisition in step (3), point
Phase of impedance of the oscillator circuit under subsynchronous/supersynchronous frequency of oscillation is not calculated, judges whether harmonic impedance protection element is moved
Make；
(6) subsynchronous/supersynchronous oscillating component real time data in the three-phase current of filtered acquisition in step (3), meter
The power magnitude under different frequencies of oscillation is calculated, the current component amplitude and duration according to frequency of oscillation judges harmonic wave electricity
Stream protection element whether action；
(7) there is each circuit of subsynchronous/supersynchronous vibration according to this line power vibration protection unit obtained by step (4)-(6)
Part, harmonic impedance protection element, the harmonic current protection element whether judged result of action, it is determined whether send route protection and move
It is circuit excision signal as signal；
(8) for all each bar circuits for sending route protection action signal, according to setting mechanism, tripping operation successively cuts off corresponding line
Road.
8. subsynchronous/supersynchronous vibration monitoring protection method according to claim 7, it is characterised in that：
In step (2), fast Fourier FFT data window selection selects the data window of 1s.
9. subsynchronous/supersynchronous vibration monitoring protection method according to claim 7, it is characterised in that：
In step (3), the centre frequency interval 1Hz of all bandpass filters, passband width is 1Hz, for step (2) identification
K-th subsynchronous/supersynchronous frequency of oscillation f for going outssoK (), the online frequency that is loaded into is f0-fsso(k) and f0+fssoThe band logical of (k)
Wave filter, wherein f0For work frequency, fsso(k) be k-th subsynchronous/supersynchronous frequency, the three-phase phase voltage of same circuit
With the bandpass filter that three-phase phase current passes sequentially through all oscillation modes, obtain all subsynchronous in each phase voltage, electric current
Frequency f0-fsso(k) corresponding voltage, current component and supersynchronous frequency f0+fsso(k) corresponding voltage, current component；Band logical
Wave filter design is deviateing passband central frequency 2Hz, and decay 40dB.
10. subsynchronous/supersynchronous vibration monitoring protection method according to claim 7 or 8, it is characterised in that：
In step (4), the operation condition of oscillation of power protection element is：
Psub(k)≥Pset, Tp(k)≥Tp_setAnd Δ Pave＜ Δ Pave_set；
Wherein：
PsubK () is the corresponding instantaneous power amplitude of k-th subsynchronous/supersynchronous frequency of oscillation；
TpK () is Psub(k)≥PsetDuration, Tp_setFor oscillation of power guard time definite value；
PsetTo set threshold value；
ΔPaveFor circuit power frequency power change values；
ΔPave_setFor power frequency power variation threshold value.
11. subsynchronous/supersynchronous vibration monitoring protection methods according to claim 10, it is characterised in that：
Setting threshold value PsetSpan is subsynchronous/supersynchronous oscillator circuit occurs 1%～2% rated power；
Oscillation of power guard time definite value Tp_setFor 12～20s；
Power frequency power variation threshold value Δ Pave_setSpan is 2%～5% that subsynchronous/supersynchronous oscillator circuit occurs
Rated power.
12. subsynchronous/supersynchronous vibration monitoring protection methods according to claim 7 or 9, it is characterised in that：
In step (5), respectively calculate circuit subsynchronous/supersynchronous frequency of oscillation under three-phase phase of impedance
Harmonic impedance protection element operation condition is need to simultaneously to meet following two conditions：
Three-phase phase of impedanceIn have two-phase and above real part for negative or have two-phase and above imaginary part to be negative；
The circuit three-phase currentIn arbitrary phasor amplitude be more than action threshold value IR_set, TRK () is more than for electric current
IR_setDuration, TR_setFor harmonic impedance guard time definite value.
13. subsynchronous/supersynchronous vibration monitoring protection methods according to claim 12, it is characterised in that：
Action threshold value IR_setValue is the rated current of the 0.5%～1% of the circuit that subsynchronous/supersynchronous vibration occurs；
Wave impedance guard time definite value TR_setValue is 3～8s.
14. subsynchronous/supersynchronous vibration monitoring protection methods according to claim 7 or 9, it is characterised in that：
In step (6), the operation condition of the harmonic current components is：
Arbitrary phase harmonic current is more than harmonic current threshold value Ii_set, and the duration is more than harmonic current time definite value
Ti_set, wherein, Ii_setFor the harmonic current threshold value of setting；Ti_setFor the harmonic current time definite value of setting.
15. subsynchronous/supersynchronous vibration monitoring protection methods according to claim 14, it is characterised in that：
Harmonic current threshold value Ii_setSpan is subsynchronous/supersynchronous oscillator circuit occurs 1%～2% specified work(
Rate；
Harmonic current time definite value span is 8～12s.
16. subsynchronous/supersynchronous vibration monitoring protection methods according to claim 7, it is characterised in that：In step (7)
In, used as main protection, harmonic current protection element is second level back-up protection to harmonic impedance protection element, and oscillation of power protection is first
Part is third level back-up protection；Wherein, the actuation time of harmonic impedance protection element is most short and small in harmonic current protection element
Actuation time, the actuation time of harmonic current protection element is less than the actuation time of oscillation of power protection element.
17. subsynchronous/supersynchronous vibration monitoring protection methods according to claim 7 or 16, it is characterised in that：
In step (8), when there is a plurality of circuit to send protection signal, according to according to setting mechanism, successively tripping operation excision
Respective lines, the setting mechanism refers to the mechanism of being manually set, that is, the significance level order of each bar circuit is manually set, according to weight
The backward of the property wanted cuts off successively the circuit for sending protection signal, until complete resection finish or circuit it is subsynchronous/it is super same
Step vibration disappears and respective lines protection signal is returned.
18. subsynchronous/supersynchronous vibration monitoring protection methods according to claim 7 or 16, it is characterised in that：
In step (8), when there is a plurality of circuit to send protection signal, according to according to setting mechanism, successively tripping operation excision
Respective lines, the setting mechanism refers to automatic Load flow calculation mechanism, that is, the power frequency power of each bar circuit is calculated, according to power frequency work(
Rate starts excision from the minimum circuit of power frequency power successively from little to big sequence, until complete resection is finished or circuit time is same
Step/supersynchronous vibration disappears and respective lines protection signal is returned.
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| CN114928075B (en) * | 2022-05-23 | 2024-05-07 | 国家电网有限公司华东分部 | Control method of subsynchronous oscillation based on instantaneous active power of power grid line |
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