CN106202729A - A kind of transient characterisitics evaluation methodology of refining and petrochemical processing units electric power system - Google Patents
A kind of transient characterisitics evaluation methodology of refining and petrochemical processing units electric power system Download PDFInfo
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Abstract
The invention discloses a kind of based on refining and petrochemical processing units electric power system transient characterisitics evaluation methodology, belong to petrochemical industry electrical safety technical field, mainly include building electric power system model and parameter, method of operation setting, fault setting, transient characterisitics Simulation Analysis, transient stability run six steps such as judgement, steady control measure proposition.The present invention can penetrate into device electric power system and plan, designs, run and manage various aspects; qualitative assessment electric power system is voltage, merit angle, the transient characterisitics of frequency and the risk of loss load under inside and outside electric network fault disturbance; check relay protection, peace the most appropriate from definite value and the cooperation of device; judge whether that there will be the harm situation such as technique or motor dropout occurs; and raising system control measure under unusual service condition are proposed; the safe and stable operation of ensuring equipment electric power system, reduces the load loss in perturbation process.
Description
Technical field
The invention belongs to petrochemical industry electrical safety technical field, be specifically related to a kind of refining and petrochemical processing units electric power system
Transient characterisitics evaluation methodology.
Background technology
The process units of Large Scale Petrochemical Enterprises has the spies such as high temperature, high pressure, poisoning inflammable, explosive, easy, relatedness be strong
Point, its electric power system must be fulfilled for process units safe and stable, long period, at full capacity, the requirement that runs of high-quality.Oil
Work enterprise is through putting into for many years and the developing at a progressive speed of continuous capacity expansion revamping, and ten million ton/year of oil refining, million tons/year of ethylene etc. are large-scale
Change, economized, modern production device build up after putting into operation in succession, and the power supply safety stability requirement to device is more and more higher.Raw
Producing device once occurs the situations such as power-off, voltage pulsation, voltage jump to will result in the unplanned parking of process units large area, simultaneously
Be easily caused catch fire, explode, leak, device damage, casualties, the great secondary accident such as environmental pollution, cause heavy losses.Closely
The unplanned parking accident that the refining and petrochemical processing units of several years statistics causes due to " shake electricity " accounts for more than the 20% of total accident, also have by
The trend that year rises.Therefore, refining and petrochemical processing units electric power system safety and stability sex chromosome mosaicism always needs are paid close attention to and are solved
Common problem.
Electric power system security and stability can be divided into steady stability and transient stability, and refining and petrochemical processing units is due to " shaking electric "
The unplanned parking accident caused causes mainly due to the Ability of Resisting Disturbance weakness of the internal external power grid of system, i.e. system transient modelling
Stability problem, such as: put into or excise the main equipment excisions such as jumbo motor, electromotor or put into electric power system, confession
The electricity system failure and other reasons that is short-circuited is responsible for electric power system unstability and causes " shake electricity " accident.Therefore, need badly and carry out oil refining
The transient security evaluating characteristics of chemical plant installations, and raising system control measure under unusual service condition are proposed, ensuring equipment is powered
The safe and reliable operation of system.
Summary of the invention
For above-mentioned technical problem present in prior art, the present invention proposes a kind of oil refining based on PSD-BPA
Frock puts the transient characterisitics evaluation methodology of electric power system, for capacity checking device electric power system when by big disturbance (each short circuit,
Switching circuit or transformator etc.) keep stable operation, the ability of power supply continuously, reasonable in design, there is good promotional value.
To achieve these goals, the present invention adopts the following technical scheme that
The transient characterisitics evaluation methodology of a kind of refining and petrochemical processing units electric power system, comprises the steps:
Step 1: build electric power system model and obtain model parameter
Electric power system model by the primary equipment including electromotor, circuit, transformator and control system model thereof, with
Motor is main load model, and include cutting soon, relay protection, secondary device model including prepared auto restart, by interconnecting mutually
Connect composition；It includes the data within utility power grid and the data outside electrical network interconnected therewith；
The primary equipment model of electric power system and the parameter of load model are passed through equipment account information, Modeling Research, are dispatched from the factory
Parameter or actual measurement gain of parameter；Electromotor uses time transient potential variation model；Circuit including aerial line and cable and
Transformator uses π type Type Equivalent Circuit Model；Load model is represented by motor model and static load model, and motor model is adopted
With three rank electromechanical transient motor models, static models use ZIP model；
The secondary device model of electric power system uses actual definite value or actual act time；
Step 2: the method for operation is arranged
According to including network structure, utility power grid startup-shutdown plan, Plant maintenance plan, load variations situation and outside
The electrical network method of operation of being correlated with in interior condition, for the rough sledding occurred in electric power system actual motion, arranges the bag of system
Include unit start-stop situation, maximum or minimum load situation in the interior method of operation, line sensitivity of going forward side by side analysis；
Step 3: fault is arranged
In the position of fault being likely to occur, following fault is set:
(1) any circuit single-phase transient earthing fault successful reclosing simultaneously；
(2) arbitrary circuit fault-free broken string is misaligned；
(3) arbitrary circuit three phase short circuit fault disconnects misaligned；
(4) transformer short circuit fault；
(5) loss of exicitation fault；
(6) generator outlet short trouble；
(7) arbitrary big load fluctuation；
Step 4: transient characterisitics Simulation Analysis
The transient characterisitics Simulation Analysis of electric power system, including calculation of short-circuit current, the scanning of interior external power grid forecast failure
Analysis, isolated island stable operation analysis and motor start-up specificity analysis；
Step 5: transient stability runs and judges
The transient stability of electric power system runs and judges, including calculation of short-circuit current criterion, the scanning of interior external power grid forecast failure
Analyze criterion, isolated island stable operation criterion and motor start-up Performance criteria；
Step 6: the steady proposition controlling measure
When short circuit current exceeds standard, the measure that the planning stage takes: select the bigger switchgear of drop-out current,
The reasonable layering and zoning of electrical network, power supply rationally access, use short circuit current limiter,；The measure that operation phase takes: untie height
Pressure ring network operation, breaking part circuit, bus fanout operation；
For interior external power grid forecast failure scanning analysis problem that may be present, propose to improve electric network composition, optimize and gain merit
Reactive power source layout and the method for operation, formulation peace coordinate allocation plan from device and relevant relay protection, and configuration dynamic reactive is mended
Repay device；
When electric power system islet operation is unsatisfactory for requiring, reasonable disposition interlocking cuts machine, interlocking cutting load, quick closing valve
Porthole, checks or configures Out-of-Step Splitting Systems, quick off-the-line, UFLS, low-voltage load sheding, high-frequency cutting machine, checks electromotor and vapour
Turbine concerns net relaying configuration mutually；
When motor starting analysis is unsatisfactory for requiring, select to arrange motor to rise under the rational method of operation
Dynamic, if the condition of having not been met, option and installment dynamic reactive compensation device；Motor is all risen and analyzes the feelings being unsatisfactory for requiring
Condition, was optimized starting time and starting batch, and from device configuration, motor protection and peace are coordinated configuration.
Preferably, in step 3, the mute time of protection fault is chosen by following data:
(1) 220kV circuit: 0.12 second, nearly side, trouble point, 0.12 second, side, remote trouble point；
(2) 110kV circuit: 0.15 second, nearly side, trouble point, 0.20 second, side, remote trouble point；
(3) fault clearing time of transformator considers by with the electric pressure circuit near terminal fault mute time.
Preferably, in step 4, described calculation of short-circuit current, specifically include: calculate the various method of operation of electric power system
Under maximum short circuit current corresponding to each node, with the short circuit current level of checking system whether switchgear connecting-disconnecting function it
In, it is ensured that when equipment is short-circuited fault, switchgear can reliably cut off short circuit current, isolated fault element；Check existing simultaneously
Protected equipment definite value is the most reasonable；
Described interior external power grid forecast failure scanning analysis, specifically includes: analogue simulation electric power system include electromotor,
Transformator, circuit, outside coupling line are when interior equipment generation most common failure or combined fault, it is determined that the voltage of system, merit angle,
Frequency whether unstability, it is the most appropriate from definite value and the cooperation of device to check relay protection, peace, searches that to affect security of system steady
The fixed incipient fault type run；
Described isolated island stable operation is analyzed, and specifically includes: when analogue simulation device electric power system isolated island is formed in system
Frequency and the variation characteristic of voltage, the risk of assessment system isolated power grid unstability；System is included, and UFLS, low pressure subtract
Carry, connection cutting load carries out reasonable disposition at interior security and stability control measurement, and analysis part electromotor relates to net protection definite value orphan
Adaptability under the mode of island；Specifying the deficiency of existing configuration, propose reasonably improvement, perfect scheme, final guarantee system is respectively
Plant lonely net stable operation under the possible method of operation；
Described motor start-up specificity analysis, specifically includes: the present situation of analytical equipment high capacity motor Starting mode, right
Possible Starting mode is simulated, carry out high capacity motor or motor unit all rise voltage levvl calculate, starting torque verification,
Stable calculation, analyzes system built-in motor active power, reactive power and the recovery situation of port voltage, determines enterprise's electric power
Load importance ranking scheme, proposes possible motor and all rises strategy, studies automatic switching control equipment at different levels and recurs with motor
Matching problem between dynamic requirement, split-phase motor is restarted the impact on electric power system safe and stable operation, is formulated motor
Restart scheme and flow process.
Preferably, in steps of 5, described calculation of short-circuit current criterion, specifically include: the plant stand bus calculated
Three short circuit current and single-phase short circuit current value are respectively less than the rated short circuit drop-out current of switchgear in this plant stand, and leave suitable
When nargin；
Described interior external power grid forecast failure scanning analysis criterion, specifically includes: after electric power system suffers disturbance, causes same
In step system, between each unit, merit angle is waved relatively, out-of-step free through first, second cycle of oscillation, makees synchronous fading vibration,
System backbone point voltage gradually recovers；The main busbar voltage of electric power system can be recovered to 0.6pu～0.7pu in 0.5s, or is
System does not haves the situation that the dropout of motor large area causes production technology to be stopped transport；
Described isolated island stable operation criterion, specifically includes: FREQUENCY CONTROL is in the range of 49～51.5Hz, and off-the-line is run extensive
After multiple stable state, frequency is in the range of 49.5～50.5Hz；
Described motor start-up Performance criteria, specifically includes: during motor Fraquent start, busbar voltage the most preferably less than volume
Determine the 90% of voltage, when motor infrequently starts, the most preferably less than the 85% of rated voltage；Illuminate and other when not connecing on bus
The load sensitive to voltage pulsation, and when motor infrequently starts, it is not less than the 80% of rated voltage；If not connecing other on bus
Electrical equipment, then busbar voltage is by the conditional decision ensureing motor starting torque；For rated voltage at the electricity of below 1000V
Motivation, should ensure that the voltage of contactor coil is not less than release voltage, if being unsatisfactory for starting conditions requirement, then selects rising of other
Flowing mode starts motor.
Present invention have the advantage that
The transient characterisitics evaluation methodology of the refining and petrochemical processing units electric power system based on PSD-BPA that the present invention addresses, permissible
Penetrating into device electric power system and plan, design, run and manage various aspects, assessment electric power system is disturbed at inside and outside electric network fault
Dynamic lower voltage, merit angle, the transient characterisitics of frequency and the risk of loss load, check relay protection, pacify the definite value from device and association
Allotment is closed the most appropriate, it may be judged whether there will be the harm situation such as technique or motor dropout and occurs, and proposes raising system and exist
Control measure under unusual service condition, the safe and stable operation of ensuring equipment electric power system, reduces the load loss in perturbation process.
Accompanying drawing explanation
Fig. 1 is the flow process of the transient characterisitics evaluation methodology of present invention refining and petrochemical processing units based on PSD-BPA electric power system
Block diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings and the present invention is described in further detail by detailed description of the invention:
Refining and petrochemical processing units electric power system transient characterisitics evaluation methodology (as shown in Figure 1) based on PSD-BPA, including as follows
Step:
Step 1: build electric power system model and parameter
Electric power system model is by all kinds of primary equipments and the control system models thereof such as electromotor, circuit, transformator, load mould
Type (motor is main), and cut soon, relay protection, the secondary device model such as prepared auto restart, by being connected with each other composition, including enterprise
Industry electrical network internal data and the electrical network external data interconnected therewith.
The primary equipment model of electric power system and the parameter of load model should be passed through equipment account information, Modeling Research, go out
Factory's parameter or actual measurement gain of parameter.Electromotor should use time transient potential variation model；Circuit (including aerial line and cable) and
Transformator typically uses π type Type Equivalent Circuit Model；Load model is represented by motor model and static load model, motor mould
Type uses three rank electromechanical transient motor models, and static models use ZIP model.
The secondary device model of electric power system should use actual definite value or actual act time.
Step 2: the method for operation is arranged
According to network structure, utility power grid startup-shutdown plan, Plant maintenance plan, load variations situation and external electrical
The conditions such as the relevant method of operation of net, for the rough sledding being likely to occur in electric power system actual motion, arrange the operation of system
Mode.Including unit start-stop situation, maximum or minimum load situation etc., and carry out the sensitive analysis of necessity, it is ensured that consider
The rough sledding being likely to occur, it is also contemplated that outside coupling off-the-line system forms the method for operation of isolated island.
Step 3: fault is arranged
From the position of fault being likely to occur, mainly consider and arrange following fault:
(1) any circuit single-phase transient earthing fault successful reclosing simultaneously；
(2) arbitrary circuit fault-free broken string is misaligned；
(3) arbitrary circuit three phase short circuit fault disconnects misaligned (being generally located in circuit both sides substation exit)；
(4) transformer short circuit fault (being generally located in high-pressure side or medium voltage side outlet)；
(5) loss of exicitation fault；
(6) generator outlet short trouble (be generally located in boosting and become high pressure side outlet)；
(7) arbitrary big load fluctuation.
Quickly protection fault clearing time is typically chosen by following data:
(1) 220kV circuit: 0.12 second, nearly side, trouble point, 0.12 second, side, remote trouble point；
(2) 110kV circuit: 0.15 second, nearly side, trouble point, 0.20 second, side, remote trouble point；
(3) fault clearing time of transformator considers by with the electric pressure circuit near terminal fault mute time.
The fault clearing time of other protection act should be arranged according to protection is concrete, and reclosing device should use actual coincidence
The lock time.
Step 4: transient characterisitics Simulation Analysis
Device electric power system transient characterisitics Simulation Analysis, sweeps including calculation of short-circuit current, interior external power grid forecast failure
Retouch analysis, isolated island stable operation analysis, motor start-up specificity analysis；Wherein,
Calculation of short-circuit current, calculates the maximum short circuit current that under the various method of operation of electric power system, each node is corresponding, with inspection
Whether the short circuit current level of check system is within the connecting-disconnecting function of switchgear, it is ensured that switch when equipment is short-circuited fault
Equipment can reliably cut off short circuit current, isolated fault element；Check existing protection equipment definite value the most reasonable simultaneously.
Interior external power grid forecast failure scanning analysis, analogue simulation electric power system electromotor, transformator, circuit, outside coupling
When the equipment generation most common failures such as line or combined fault, it is determined that system voltage, merit angle, frequency whether unstability, check relay protection,
Pacify the definite value from device and cooperation is the most appropriate, search the incipient fault type affecting security of system stable operation.
Isolated island stable operation is analyzed, frequency and the change of voltage in system when analogue simulation device electric power system isolated island is formed
Characteristic, the risk of assessment system isolated power grid unstability；To safety and stability such as the UFLS of system, low-voltage load sheding, connection cutting loads
Control measure carry out reasonable disposition, and analysis part electromotor relates to net protection definite value adaptability under isolated island mode；Specify existing
The deficiency of configuration, proposes reasonably improvement, perfect scheme, finally ensures that system lonely net under the various possible methods of operation is stablized
Run.
Motor start-up specificity analysis, the present situation of analytical equipment high capacity motor Starting mode, to possible Starting mode
Be simulated, carry out high capacity motor or motor unit all rise voltage levvl calculate, starting torque verification, stable calculation, point
Analysis system built-in motor active power, reactive power and the recovery situation of port voltage, determine enterprise electric load importance row
Sequence scheme, proposes possible motor and all rises strategy.Study automatic switching control equipment at different levels and motor is restarted between requirement
Matching problem, split-phase motor restarts the impact on electric power system safe and stable operation, formulate motor restart scheme and
Flow process.
Step 5: transient stability runs and judges
Calculation of short-circuit current criterion: three short circuit current and the single-phase short circuit current value of the plant stand bus calculated are the least
The rated short circuit drop-out current of switchgear in this plant stand, and leave suitable nargin.
Interior external power grid forecast failure scanning analysis criterion: after electric power system suffers disturbance, each unit in causing synchronization system
Between merit angle relatively wave, out-of-step free through first, second cycle of oscillation, make synchronous fading vibration, system backbone point voltage
Gradually recover；The main busbar voltage of electric power system can be recovered to 0.6pu～0.7pu in 0.5s, or system does not haves electronic
The dropout of machine large area causes the situation that production technology is stopped transport.
Isolated island stable operation criterion: highest frequency controls at below 51.5Hz, low-limit frequency is 49Hz, off-the-line restoring running
After stable state, frequency is in the range of 49.5～50.5Hz.
Motor start-up Performance criteria: generally, during motor Fraquent start, the most specified electricity of busbar voltage
The 90% of pressure, when motor infrequently starts, the most preferably less than the 85% of rated voltage；When do not connect on bus illumination and other is to electricity
The load that pressure fluctuation is sensitive, and when motor infrequently starts, it is not less than the 80% of rated voltage；If not connecing other on distribution bus
Electrical equipment, then can be by the conditional decision ensureing motor starting torque；For low-tension motor, still should ensure that contactor coil
Voltage be not less than release voltage, if if being unsatisfactory for starting conditions requirement, then need the start mode selecting other to start
Motor.
Step 6: steady control measure proposes
When short circuit current exceeds standard, it is necessary to take measures to be down to switch below breaking current.Planning stage
The measure that can take has: selecting the switchgear that drop-out current is bigger, the reasonable layering and zoning of electrical network, power supply rationally accesses, and uses
The technology such as short circuit current limiter；The measure that operation phase can take has: untie high-low pressure loop-net operation, breaking part circuit,
Bus fanout operation etc..
For interior external power grid forecast failure scanning analysis problem that may be present, propose to improve electric network composition, optimize and gain merit
Reactive power source layout and the method for operation, formulation peace coordinate allocation plan from device and relevant relay protection, and configuration is certain if desired
The dynamic reactive compensation device of capacity.
When electric power system islet operation is unsatisfactory for requiring, reasonable disposition interlocking cuts machine, interlocking cutting load, quick closing valve
Porthole, checks or configures Out-of-Step Splitting Systems, quick off-the-line, UFLS, low-voltage load sheding, high-frequency cutting machine, checks electromotor, steam turbine
Concern net relaying configuration mutually.
When motor starting analysis is unsatisfactory for requiring, select to arrange under the rational method of operation electric motor starting,
If the condition of having not been met, stablizing of utility power grid voltage can be improved with the dynamic reactive compensation device of option and installment certain capacity
Property；For motor all rise analysis be unsatisfactory for require in the case of, to the starting time and start batch be optimized, to motor protect
Protect and pacify and coordinate configuration from device configuration.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, and this technology is led
Change that the technical staff in territory is made in the essential scope of the present invention, retrofit, add or replace, also should belong to the present invention's
Protection domain.
Claims (4)
1. the transient characterisitics evaluation methodology of a refining and petrochemical processing units electric power system, it is characterised in that: comprise the steps:
Step 1: build electric power system model and obtain model parameter
Electric power system model is by the primary equipment including electromotor, circuit, transformator and control system model thereof, with electronic
Machine is main load model, and include cutting soon, relay protection, secondary device model including prepared auto restart, by being connected with each other group
Become；It includes the data within utility power grid and the data outside electrical network interconnected therewith；
The primary equipment model of electric power system and the parameter of load model are by equipment account information, Modeling Research, parameter of dispatching from the factory
Or actual measurement gain of parameter；Electromotor uses time transient potential variation model；Circuit including aerial line and cable and transformation
Device uses π type Type Equivalent Circuit Model；Load model is represented by motor model and static load model, and motor model uses three
Rank electromechanical transient motor model, static models use ZIP model；
The secondary device model of electric power system uses actual definite value or actual act time；
Step 2: the method for operation is arranged
According to including network structure, utility power grid startup-shutdown plan, Plant maintenance plan, load variations situation and external electrical network
The relevant method of operation is in interior condition, and for the rough sledding occurred in electric power system actual motion, arrange system includes machine
Group start-stop situation, maximum or minimum load situation in the interior method of operation, line sensitivity of going forward side by side analysis；
Step 3: fault is arranged
In the position of fault being likely to occur, following fault is set:
(1) any circuit single-phase transient earthing fault successful reclosing simultaneously；
(2) arbitrary circuit fault-free broken string is misaligned；
(3) arbitrary circuit three phase short circuit fault disconnects misaligned；
(4) transformer short circuit fault；
(5) loss of exicitation fault；
(6) generator outlet short trouble；
(7) arbitrary big load fluctuation；
Step 4: transient characterisitics Simulation Analysis
The transient characterisitics Simulation Analysis of electric power system, including calculation of short-circuit current, interior external power grid forecast failure scanning analysis,
Isolated island stable operation analysis and motor start-up specificity analysis；
Step 5: transient stability runs and judges
The transient stability of electric power system runs and judges, including calculation of short-circuit current criterion, interior external power grid forecast failure scanning analysis
Criterion, isolated island stable operation criterion and motor start-up Performance criteria；
Step 6: the steady proposition controlling measure
When short circuit current exceeds standard, the measure that the planning stage takes: select switchgear, electrical network that drop-out current is bigger
Rationally layering and zoning, power supply rationally access, use short circuit current limiter,；The measure that operation phase takes: untie height pressure ring
Network operation, breaking part circuit, bus fanout operation；
For interior external power grid forecast failure scanning analysis problem that may be present, propose to improve electric network composition, optimize active reactive
Power generation configuration and the method for operation, formulation peace coordinate allocation plan, configuration dynamic passive compensation dress from device and relevant relay protection
Put；
When electric power system islet operation is unsatisfactory for requiring, reasonable disposition interlocking cuts machine, interlocking cutting load, quick closing valve vapour
Door, checks or configures Out-of-Step Splitting Systems, quick off-the-line, UFLS, low-voltage load sheding, high-frequency cutting machine, checks electromotor and steamer
Machine concerns net relaying configuration mutually；
When motor starting analysis is unsatisfactory for requiring, select to arrange electric motor starting under the rational method of operation, if
Have not been met condition, option and installment dynamic reactive compensation device；For motor all rise analysis be unsatisfactory for require in the case of, to rise
Dynamic time and starting batch are optimized, and from device configuration, motor protection and peace are coordinated configuration.
2. according to the transient characterisitics evaluation methodology of the refining and petrochemical processing units electric power system described in right 1, it is characterised in that: in step
In 3, the mute time of protection fault is chosen by following data:
(1) 220kV circuit: 0.12 second, nearly side, trouble point, 0.12 second, side, remote trouble point；
(2) 110kV circuit: 0.15 second, nearly side, trouble point, 0.20 second, side, remote trouble point；
(3) fault clearing time of transformator considers by with the electric pressure circuit near terminal fault mute time.
3. according to the transient characterisitics evaluation methodology of the refining and petrochemical processing units electric power system described in right 1, it is characterised in that: in step
In 4, described calculation of short-circuit current, specifically include: calculate the maximum that under the various method of operation of electric power system, each node is corresponding short
Whether road electric current, with the short circuit current level of checking system within the connecting-disconnecting function of switchgear, it is ensured that occur short at equipment
During the fault of road, switchgear can reliably cut off short circuit current, isolated fault element；Whether check existing protection equipment definite value simultaneously
Rationally；
Described interior external power grid forecast failure scanning analysis, specifically includes: analogue simulation electric power system includes electromotor, transformation
Device, circuit, outside coupling line are when interior equipment generation most common failure or combined fault, it is determined that the voltage of system, merit angle, frequency
Whether unstability, it is the most appropriate from definite value and the cooperation of device to check relay protection, peace, and searching affects security of system and stably transport
The incipient fault type of row；
Described isolated island stable operation is analyzed, and specifically includes: frequency in system when analogue simulation device electric power system isolated island is formed
With the variation characteristic of voltage, the risk of assessment system isolated power grid unstability；System is included UFLS, low-voltage load sheding, connection
Cutting load carries out reasonable disposition at interior security and stability control measurement, and analysis part electromotor relates to net protection definite value in isolated island mode
Under adaptability；Specifying the deficiency of existing configuration, propose reasonably improvement, perfect scheme, final guarantee system is in various possibilities
The method of operation under lonely net stable operation；
Described motor start-up specificity analysis, specifically includes: the present situation of analytical equipment high capacity motor Starting mode, to possible
Starting mode be simulated, carry out high capacity motor or motor unit all rise voltage levvl calculate, starting torque verification, stable
Property calculate, analyze system built-in motor active power, reactive power and the recovery situation of port voltage, determine enterprise's electric load
Importance ranking scheme, proposes possible motor and all rises strategy, studies automatic switching control equipment at different levels and restarts with motor and want
Matching problem between asking, split-phase motor is restarted the impact on electric power system safe and stable operation, is formulated motor and open
Dynamic scheme and flow process.
4. according to the transient characterisitics evaluation methodology of the refining and petrochemical processing units electric power system described in right 1, it is characterised in that: in step
In 5, described calculation of short-circuit current criterion, specifically include: the three short circuit current of the plant stand bus calculated and single-phase short
Road current value is respectively less than the rated short circuit drop-out current of switchgear in this plant stand, and leaves suitable nargin；
Described interior external power grid forecast failure scanning analysis criterion, specifically includes: after electric power system suffers disturbance, causes synchronization system
In system, between each unit, merit angle is waved relatively, out-of-step free through first, second cycle of oscillation, makees synchronous fading vibration, system
Backbone point voltage gradually recovers；The main busbar voltage of electric power system can be recovered to 0.6pu～0.7pu in 0.5s, or system is not
There will be the situation that the dropout of motor large area causes production technology to be stopped transport；
Described isolated island stable operation criterion, specifically includes: FREQUENCY CONTROL is in the range of 49～51.5Hz, and off-the-line restoring running is steady
After state, frequency is in the range of 49.5～50.5Hz；
Described motor start-up Performance criteria, specifically includes: during motor Fraquent start, the most specified electricity of busbar voltage
The 90% of pressure, when motor infrequently starts, the most preferably less than the 85% of rated voltage；When do not connect on bus illumination and other is to electricity
The load that pressure fluctuation is sensitive, and when motor infrequently starts, it is not less than the 80% of rated voltage；If not connecing other electricity consumptions on bus
Equipment, then busbar voltage is by the conditional decision ensureing motor starting torque；For electronic at below 1000V of rated voltage
Machine, should ensure that the voltage of contactor coil is not less than release voltage, if being unsatisfactory for starting conditions requirement, then selects other starting
Mode starts motor.
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