CN106786676B - Decision for Emergency State of Power Ssystem auxiliary control method based on static synchronous compensator - Google Patents
Decision for Emergency State of Power Ssystem auxiliary control method based on static synchronous compensator Download PDFInfo
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- CN106786676B CN106786676B CN201710113383.7A CN201710113383A CN106786676B CN 106786676 B CN106786676 B CN 106786676B CN 201710113383 A CN201710113383 A CN 201710113383A CN 106786676 B CN106786676 B CN 106786676B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention belongs to power system security stability control techniques field more particularly to a kind of Decision for Emergency State of Power Ssystem auxiliary control methods based on static synchronous compensator STATCOM.Grid operation data is specially collected, nodal frequency, voltage where STATCOM after failure is detected, calculates frequency and voltage change ratio, judge Transient Instability classification.When the Transient Instability that electric system occurrence frequency is dominated, power system frequency stability is promoted in such a way that STATCOM absorbing reactive power, reduction part of nodes voltage are to reduce the active vacancy of system.If reactive power regulatory demand exceeds the reactive capability range of STATCOM, STATCOM is put into greatest extent and power system stability operation is guaranteed using other emergent control measures cooperation STATCOM Reactive-power control.The present invention improves the utilization efficiency of STATCOM, has taken into account the safety and economy of emergency control method.
Description
Technical field
The invention belongs to power system security stability control techniques fields, more particularly to one kind to be based on static synchronous compensator
Decision for Emergency State of Power Ssystem auxiliary control method.
Background technique
The positive extensive interacted system development of China's power grid, electric network composition have occurred compared to original island network in recent years
Larger change.Shared scale becomes larger high power station in systems, and interacted system transmission distance is longer, partial electric grid generated energy
With electricity consumption imbalance, apparent sending end power grid and receiving end power grid are formd.High power station or bulk power transmission route
Excision will cause the unbalanced problem of partial electric grid active and reactive power, and particularly with receiving end power grid, it is serious in power shortage
When will lead to the whole network voltage to frequency collapse.Therefore, the control method of Decision for Emergency State of Power Ssystem is most important.
Currently, POWER SYSTEM EMERGENCY CONTROL method mainly has islanding control, cuts machine, cutting load, encourages control, Fast Valving by force
And electric braking etc..
(1) islanding control: the cost of islanding control is larger, and electric power generally cannot be effectively ensured in other emergency control methods
Island-grid is resolved into electric system when power system transient stability to control.The disadvantage of this method is that practical electric power
It is difficult to find that ideal splitting point in system, brings and asks there are the selection that multiple splitting points are also splitting point in complicated electric power system
Topic.In addition, the island network after off-the-line is typically in oscillatory regime, need further to take other emergency control methods cooperation solution
Column control program is to keep the stable operation of each island network.
(2) cut machine: if electric system spare capacity is sufficient, the cut-out generator when voltage to frequency is higher improves system
The transient stability of system.The disadvantages of the method are as follows it is excessive to will lead to system frequency voltage if excision generator capacity is excessive
Decline, final system loss of stability.
(3) cutting load: cutting off a certain amount of load when power system frequency voltage is in reduced levels, thus guarantee be
The balance for active and reactive power of uniting, and then guarantee voltage to frequency stability.Cutting machine-cut load measure is to promote electrical power system transient
The effective measures of stability, the disadvantages of this method are to cut the formulation of machine-cut duration of load application, place and quantity.In addition, electric power
System active and reactive power is mutually coupled, and how low-frequency and low-voltage problem is established often with occurring and comprehensively consider voltage to frequency spy
The cutting load measure of property requires study.
(4) it encourages control by force: during transient stability after system jam, making generator specific at one section by force
Time is in and encourages state by force, an additional synchronizing torque is provided with excitation con-trol for generator, to guarantee system jam
Generator-motor gesture is improved when making that voltage is held to reduce, to increase the electromagnetic power of generator output.The difficult point of this method is
The reasonable control of amplitude and start-stop time are encouraged by force.
(5) Fast Valving: by the governor of regulator generator, rapidly reduce prime mover output in the system failure
Mechanical output reduces and accelerates area, increases possible retardation area, and reopens porthole when generator rotor angle reduces to reduce hair
Motor oscillation amplitude.This method can be only applied to steam turbine, and the hydraulic turbine causes to be unable to quick closedown intake gate there are water hammer.
(6) electric braking: braking resistor is put into when generator active power surplus and consumes extra active power, increases hair
The electromagnetic power of motor output is to reduce power difference.This method needs to reasonably select the size and switching of braking resistor
Otherwise time can occur to owe braking and cross braking.
Despite these emergency control methods, large-scale blackout caused by frequency, collapse of voltage still happens occasionally,
Reason is that various emergency control policies have some limitations.On the whole, for POWER SYSTEM EMERGENCY CONTROL method,
Still lack the emergent control ancillary measure of a kind of compromise between security and economy at present.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of Decision for Emergency State of Power Ssystem auxiliary control based on static synchronous compensator
Method processed, comprising the following steps:
Step 1 collects grid operation data, including system component parameter, information on load；
Nodal frequency, voltage where step 2, detection static synchronous compensator, calculate the variation of the nodal frequency and voltage
Rate judges Transient Instability classification；
Step 3, when the Transient Instability that system occurrence frequency is dominated, static synchronous compensator enters emergent control mode, root
According to the grid operation data and nodal frequency, information of voltage, the reactive capability that static synchronous compensator absorbs is obtained；
By calculating static synchronous compensator frequency departure, by lead-lag link, PID control link and idle electricity
Stream amplitude limit link obtains the reactive current of static synchronous compensator output, so that the reactive compensation for obtaining static synchronous compensator is held
Amount.Wherein, lead-lag link, PID control link parameter are determined according to electric system practical operation situation.When Reactive-power control needs
When asking beyond static synchronous compensator reactive capability range, static synchronous compensator is put into greatest extent and using other urgent controls
Measure processed guarantees power system transient stability.
Step 4 is restored from the transient frequency unstability when system, and static synchronous compensator, which is restored to, maintains node voltage
Operating mode；Nodal frequency restores the criterion of normal mode of operation as static synchronous compensator where static synchronous compensator:
f>fref2
fref2The frequency reference of criterion is exited, from urgent control model for the static synchronous compensator in order to avoid tight
The toning of anxious control method, fref2The slightly below frequency of electric system normal operating condition.
The detailed process for judging electric system receiving end power grid Transient Instability classification in the step 2 is
According to the frequency, voltage criterion, judge whether transient state process of electric power system is low frequency problem:
Wherein, f, V be static synchronous compensator where nodal test arrive frequency, voltage；For frequency change rate,
For voltage change ratio；fref1For frequency reference, it is set to low frequency load shedding equipment operating frequency；ΔfrefFor frequency variation
Rate reference value；VrefVoltage for voltage reference value, when slightly below power system mesomeric state is run；ε be one level off to zero number,
In view of real system detection device contains error, think that voltage change ratio is zero when dV/dt is in the section [- ε ,+ε], indicates
Transient voltage drops to minimum point；Frequency variation lags behind voltage in transient state process of electric power system, and voltage change ratio levels off to zero
When, if voltage is still in normal operation range and frequency declines to a great extent and decrease speed is fast, then it is assumed that the transient state mistake of electric system
Journey belongs to receiving end power grid low frequency problem, the i.e. leading Transient Instability of system occurrence frequency.
Beneficial effect
The present invention provides a kind of Decision for Emergency State of Power Ssystem auxiliary control method, using static synchronous compensator Reactive-power control
Measure, improve the transient stability of electric system, improve static synchronous compensator utilization efficiency.The emergent control measure generation
Valence is smaller, has taken into account the safety and economy of emergent control scheme.
Detailed description of the invention
Fig. 1 is a kind of applied environment figure of Decision for Emergency State of Power Ssystem auxiliary control method of the present invention；
Fig. 2 is the flow diagram of Decision for Emergency State of Power Ssystem auxiliary control method of the invention；
Fig. 3 is a kind of implementation schematic diagram of Decision for Emergency State of Power Ssystem auxiliary control method of the present invention.
Specific embodiment
Power system voltage stabilization control method of the invention can be applied in electric system as shown in Figure 1, described
In electric system, it is in normal operating conditions when static synchronous compensator (STATCOM) stable state, passes through Reactive-power control control node
Voltage.When the Transient Instability that system occurrence frequency is dominated, frequency fall is big and voltage is in normal range (NR), and Static Synchronous is mended
Device is repaid into emergent control mode proposed by the present invention.
Fig. 2 is the flow diagram of Decision for Emergency State of Power Ssystem auxiliary control method of the invention.
The Decision for Emergency State of Power Ssystem auxiliary control method, comprising the following steps:
Collect grid operation data, including system component parameter, information on load；
Nodal frequency, voltage where static synchronous compensator, calculate the nodal frequency and voltage change ratio after detection failure,
Judge Transient Instability classification；
According to the frequency, voltage criterion, judge whether transient state process of electric power system is low frequency problem:
Wherein, f, V be static synchronous compensator where nodal test arrive frequency, voltage；For frequency change rate,
For voltage change ratio；fref1For frequency reference, it is set to low frequency load shedding equipment operating frequency；ΔfrefFor frequency variation
Rate reference value；VrefVoltage for voltage reference value, when slightly below power system mesomeric state is run；ε be one level off to zero number,
In view of real system detection device contains error, think that voltage change ratio is zero when dV/dt is in the section [- ε ,+ε], indicates
Transient voltage drops to minimum point；Frequency variation lags behind voltage in transient state process of electric power system, and voltage change ratio levels off to zero
When, if voltage is still in normal operation range and frequency declines to a great extent and decrease speed is fast, then it is assumed that the transient state mistake of electric system
Journey belongs to receiving end power grid low frequency problem, the i.e. leading Transient Instability of system occurrence frequency.
When the Transient Instability that system occurrence frequency is dominated, static synchronous compensator enters emergent control mode, according to described
Grid operation data and nodal frequency information of voltage obtain the reactive capability that static synchronous compensator absorbs.Due to power train
System contains a large amount of constant-impedance loads, and load or burden without work, which becomes larger, will cause node voltage to reduce, and active power shortage is reduced, system frequency
Go up；
When system is restored from the transient frequency unstability, static synchronous compensator is restored to the Working mould for maintaining node voltage
Formula.The present invention restores sentencing for normal mode of operation as static synchronous compensator using nodal frequency where static synchronous compensator
According to:
f>fref2
fref2The frequency reference of criterion is exited, from urgent control model for the static synchronous compensator in order to avoid tight
The toning of anxious control method, fref2The slightly below frequency of electric system normal operating condition.
Referring to Fig. 3, Fig. 3 is a kind of implementation signal of Decision for Emergency State of Power Ssystem auxiliary control method of the present invention
Figure.
The present invention proposes the static synchronous compensator reactive compensation capacity calculation method based on frequency, static same by calculating
Compensator frequency departure is walked, obtains Static Synchronous by lead-lag link, PID control link and reactive current amplitude limit link
The reactive current of compensator output, to obtain the reactive compensation capacity of static synchronous compensator.Wherein, lead-lag link,
PID control link parameter is determined according to electric system practical operation situation.When Reactive-power control demand exceeds static synchronous compensator
When reactive capability range, static synchronous compensator is put into greatest extent and guarantees that electric system is temporary using other emergent control measures
State stability.
fref3For power system frequency reference value, it is traditionally arranged to be power system mesomeric state running frequency；T1、T2It is respectively super
Before, delay component time constant；ICmax、ILmaxFor static synchronous compensator maximum capacitive, inductance current；ISFor Static Synchronous benefit
Repay the reactive current of device reality output.
The present invention judges that electrical power system transient loses by nodal frequency voltage where static synchronous compensator and its change rate
Steady classification establishes Decision for Emergency State of Power Ssystem auxiliary control method, can realize quick, the company of transient reactive power at lower cost
It is continuous to adjust, improve power system transient stability.
Claims (1)
1. a kind of Decision for Emergency State of Power Ssystem auxiliary control method based on static synchronous compensator, which is characterized in that including with
Lower step:
Step 1 collects grid operation data, including system component parameter, information on load；
Nodal frequency, voltage where step 2, detection static synchronous compensator, calculate the change rate of the nodal frequency and voltage, sentence
Disconnected Transient Instability classification；
Step 3, when system occurrence frequency dominate Transient Instability, static synchronous compensator enters emergent control mode, according to institute
Grid operation data and nodal frequency, information of voltage are stated, the reactive capability that static synchronous compensator absorbs is obtained；
By calculating static synchronous compensator frequency departure, limited by lead-lag link, PID control link and reactive current
Width link obtains the reactive current of static synchronous compensator output, to obtain the reactive compensation capacity of static synchronous compensator；
Wherein, lead-lag link, PID control link parameter are determined according to electric system practical operation situation, when Reactive-power control demand
When beyond static synchronous compensator reactive capability range, static synchronous compensator is put into greatest extent and uses other emergent controls
Measure guarantees power system transient stability；
Step 4 is restored from the transient frequency unstability when system, and static synchronous compensator is restored to the work for maintaining node voltage
Mode；Nodal frequency restores the criterion of normal mode of operation as static synchronous compensator where static synchronous compensator:
F > fref2
fref2The frequency reference of criterion is exited, from urgent control model for the static synchronous compensator in order to avoid promptly controlling
The toning of method processed, fref2The slightly below frequency of electric system normal operating condition；
The detailed process for judging electric system receiving end power grid Transient Instability classification in the step 2 is
According to the frequency, voltage criterion, judge whether transient state process of electric power system is low frequency problem:
Wherein, f, V be static synchronous compensator where nodal test arrive frequency, voltage；For frequency change rate,For electricity
Buckling rate；fref1For frequency reference, it is set to low frequency load shedding equipment operating frequency；ΔfrefFor frequency change rate ginseng
Examine value；Vref1Voltage for voltage reference value, when slightly below power system mesomeric state is run；ε be one level off to zero number, consider
Contain error to real system detection device, think that voltage change ratio is zero when dV/dt is in the section [- ε ,+ε], indicates transient state
Voltage drops to minimum point；Frequency variation lags behind voltage in transient state process of electric power system, voltage change ratio level off to zero when, if
Voltage is still in normal operation range and frequency declines to a great extent and decrease speed is fast, then it is assumed that the transient process of electric system belongs to
The leading Transient Instability of receiving end power grid low frequency problem, i.e. system occurrence frequency.
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| CN114530878A (en) * | 2021-11-25 | 2022-05-24 | 国网浙江省电力有限公司嘉兴供电公司 | Transient frequency emergency state optimization control method for new energy grid connection |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915859A (en) * | 2014-03-26 | 2014-07-09 | 华北电力大学（保定） | Method for controlling double-fed wind power plant capable of improving transient stability of power grid |
| WO2016080599A1 (en) * | 2014-11-18 | 2016-05-26 | (주)인텍에프에이 | Power quality compensation device using super capacitor, and operating method therefor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915859A (en) * | 2014-03-26 | 2014-07-09 | 华北电力大学（保定） | Method for controlling double-fed wind power plant capable of improving transient stability of power grid |
| WO2016080599A1 (en) * | 2014-11-18 | 2016-05-26 | (주)인텍에프에이 | Power quality compensation device using super capacitor, and operating method therefor |
Non-Patent Citations (1)
| Title |
|---|
| 提高暂态电压稳定水平的紧急控制策略研究;曹阳;《万方学位论文库》;20151229;第1-45页 |
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