CN103904674B - A kind of direct current transportation sending end islanded system tidal current analysis method - Google Patents
A kind of direct current transportation sending end islanded system tidal current analysis method Download PDFInfo
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Abstract
The present invention is a kind of direct current transportation sending end islanded system tidal current analysis method.Comprise the steps: 1) divide AC system and straight-flow system；2) isolated island AC system trend is solved；3) AC system and the out-of-limit judgement of straight-flow system reactive power exchange capacity, if reactive power exchange is beyond properly functioning setting value, then adjusts change of current busbar voltage amplitude, proceeds to step 2) proceed, otherwise carry out step 4)；4) DC converter reactive power compensation group number is determined；5) DC converter station reactive power consumption is determined；6) inverter Trigger Angle amplitude limit checks, if in normal operation range limit value, carries out step 7), otherwise increases reactive power compensation group number, return step 5)；7) change of current variation joint is determined；8) trend convergence judges；9) direct current frequency limit value function sets.The present invention has more accurately reflected the practical situation of direct current transportation islanded system, it is possible to instruct planning and the operation of direct current transportation islanded system.
Description
Technical field
The present invention relates to a kind of direct current transportation sending end islanded system tidal current analysis method, particularly one, to be applicable to direct current defeated
The consideration direct current frequency of electricity system sending end islet operation limits the direct current transportation sending end islet operation system load flow analysis side controlled
Method, belongs to the technical field that power system safety and stability is analyzed.
Technical background
Chinese coal and water power equal energy source resource are mainly distributed on west area, and electric load is concentrated mainly on edge, east
The area that sea is economically developed, energy resources and electric load present contrary distribution feature.Western part is utilized to enrich for effective exploitation
Energy resources, meet the socio-economic development demand to electric power, and China came into effect on a large scale, at a distance from last century end
The West-to-East Electricity Transmission Project.
Transferring electricity from the west to the east power transmission engineering mainly relies on western large-scale Hydropower Base or Thermal Power Bases construction to carry out.Because direct current is defeated
Power technology has technology economy advantage, China's great majority transferring electricity from the west to the east power transmission engineering in terms of remote, large-capacity power conveying
Direct current transportation is all used to send outside.Because western large-scale water power or Thermal Power Bases are the remotest, local load is little, near region alternating current
Net weakness, distance backbone network is distant.For optimizing electric network composition, some large hydropower station islet operations, i.e. disconnect large-scale water
Power station and the alternating current interconnection of sending end electrical network, the transmission line of electricity in power station, DC rectifier station and power station to DC rectifier station
It is collectively forming isolated electrical network, is connected with receiving end electrical network by direct current.2013 Nian Fengqi south electric network Chu Sui direct current sendings
Successful implementation islet operation, is the DC transmission engineering of China's first sending islet operation.This islanded system is by voe
Power station, gold An Qiao power station and Chu Sui direct current sending end current conversion station collectively constitute, and disconnect the 500kV friendship of Chu Sui current conversion station and Yunnan Power System
Stream interconnection, by Chu Sui direct current power transmission Guangdong Power Grid.
Tidal current analysis is the basis of direct current transportation sending end islanded system safe operation.Compare the alternating current-direct current mixing electricity of routine
Net, direct current transportation sending end islet operation system has a characteristic that
1) structural topology of islanded system is simple, generally by DC converter station crosslinking with radiation transmission line of electricity to one or several
Power plant, system load flow analyze it is important that the reactive voltage level of the running status of DC transmission system and islanded system.And
DC transmission system median filter input quantity, change of current variation joint location, Trigger Angle have weight to islanded system reactive voltage
Affect.
2) conventional load of islanded system is the least, it is common that the station electricity consumption of DC converter station and the station electricity consumption in power plant, several
Being negligible, the power that in islanded system, generator active power is mainly carried by straight-flow system balances.Relative to
Generator output capacity, straight-flow system conveying power scale is big, and frequency in islanded system is changed by the changed power of straight-flow system
There is very important impact.The frequency of islanded system is mainly by frequency limitation function and the Generator Governor of straight-flow system
Controlling, the frequency dead band of usual DC transmission system frequency limitation function is set to ± 0.1Hz, the frequency of dynamo governor
The dead time is ± 0.5Hz.Disturbance in islanded system cause frequency exceed ± 0.1Hz after, direct current frequency limitation function is quick
Action, adjusts direct current conveying power in 100ms, adjusts amplitude relatively big, some direct current frequency limitation functions be set to-50%～
The direct current transportation rated power of 20%；Disturbance causes isolated island frequency beyond after ± 0.5Hz, and dynamo governor action, generally 6
～rated output can be realized in 8 seconds adjust to the power in the range of zero load.
Common alternating current-direct current electrical network tidal current analysis method comes from the physical model of alternating current-direct current mixing bulk power grid, is mainly used in point
The trend distribution of the complicated AC network of analysis and nucleus correcting system voltage levvl.Conventional alternating current-direct current power grid load flow calculation method is used to divide
, there is following deficiency in analysis DC transmission system islet operation:
1) conventional alternating current-direct current electrical network tidal current analysis method does not considers that the frequency limitation of DC transmission system controls, it is impossible to accurate
The really characteristics of tidal flow of analog DC transmission of electricity sending end islet operation system.
Because of arbitrary unit, circuit or the ratio of transformer element conveying scale relative system total load in the big system of alternating current-direct current
Less, its fault is less on the change impact of whole system frequency, affects little on the conveying power of DC transmission system.Therefore it is conventional
Alternating current-direct current tidal current analysis method all assume that the frequency limitation function not enabled of direct current transportation, Load flow calculation thinks direct current transportation
The conveying power of system is constant, uses electromotor as the balance node of system.
And unit, circuit or transformer fault in direct current transportation sending end islet operation system, being all likely to cause meritorious disturbing
Dynamic, cause system frequency change, may the frequency limitation function of startup direct current transportation, it is possible to change DC transmission system defeated
Sending power, these characteristics of tidal flow can not be by conventional alternating current-direct current bulk power grid tidal current analysis method accurate simulation.
2) conventional alternating current-direct current bulk power grid tidal current analysis method fails accurate simulation DC transmission system idle control function
Tap_changing function is become with the change of current.
Be widely used at present commercialization tidal current analysis program, such as BPA, PSASP and PSSE, the mould to straight-flow system
Intend not accurate enough and flexible.These programs typically require user and input current conversion station reactive-load compensation total amount, it is desirable to user or appointment
Inverter Trigger Angle, or specify change of current variation joint.In the case of the reactive-load compensation total amount of user's input is irrational, having can
Can occur that change of current variation joint exceeds the situations such as normal operation range beyond its gear bands or inverter Trigger Angle, it is impossible to mould
Intend the idle group automatic switching of DC transmission system, the function that convertor transformer tap adjusts automatically.
For direct current transportation islanded system operation demand, propose more to accurately reflect direct current transportation islanded system practical situation
Tidal current analysis method is to improve the important measures of electric power netting safe running level.
Summary of the invention
It is an object of the invention to propose a kind of actual characteristic more having accurately reflected direct current transportation islanded system, it is possible to more
Instruct the planning of direct current islanded system efficiently and run the direct current transportation sending end islanded system tidal current analysis method of work.
The technical scheme is that direct current transportation sending end islanded system tidal current analysis method of the present invention, in direct current transportation
During system sending end islet operation system load flow calculates, meter and DC transmission system frequency limitation control in quick control islanded system
The effect of active power balance, is chosen for DC transmission system sending end change of current bus nodes balancing (relaxing) node, including such as
Lower step:
1) AC system and straight-flow system are divided；
2) isolated island AC system trend is solved；
3) AC system and the out-of-limit judgement of straight-flow system reactive power exchange capacity, noted by change of current bus AC system
The reactive power entering straight-flow system checks, if reactive power exchange is beyond properly functioning setting value, then adjusts change of current bus
Voltage magnitude, proceeds to step 2) proceed, otherwise carry out step 4)；
4) DC converter reactive power group number is determined；
5) DC converter station reactive power consumption is determined；
6) inverter Trigger Angle amplitude limit checks, consumes reactive power, direct current conveying active power according to inverter, gives directly
Stream voltage asks for inverter Trigger Angle, if in normal operation range limit value, carries out step 7), otherwise increase reactive power compensation
Group's number, returns step 5)；
7) change of current variation joint is determined；
8) trend convergence judges, if the change of current busbar voltage amplitude difference of AC system and straight-flow system Load Flow Solution is less than
Preset value, then trend convergence, enter step 9), the change of current busbar voltage amplitude otherwise solved with straight-flow system is put down for AC system
The voltage magnitude of weighing apparatus node, returns step 2)；
9) direct current frequency limit value function sets.
Above-mentioned steps 1) in, dividing AC system is to be divided into direct current transportation sending end islanded system to exchange with straight-flow system
System and straight-flow system, change of current bus is as AC system and the interface of straight-flow system；Isolated island AC system tidal current analysis uses
Change of current bus equivalence direct current transportation converting plant, and using change of current bus as balance node, in straight-flow system Load Flow Solution, employing is changed
Stream bus equivalence AC system, using change of current bus active power and reactive power as input.
Above-mentioned steps 2) in, solving isolated island AC system trend is to use conventional AC system flow calculation program to solve
Isolated island AC system trend, the active power absorbed from AC system by change of current bus and reactive power, as straight-flow system tide
The input that stream solves.
Above-mentioned steps 4) in, determine that DC converter reactive power group number is to be noted by change of current bus according to AC system
Enter the active power of straight-flow system, i.e. carry power according to direct current, the reactive power compensation determined when searching direct current transportation design
Switching Strategy table, determines the minimum reactive power compensation group number needing to put into, and accurate simulation DC transmission system is to wave filter
Performance and the requirement of definite value.
Above-mentioned steps 5) in, DC converter station reactive power consumption=current conversion station compensating power+AC system is sent into
The reactive power of straight-flow system.
Above-mentioned steps 7) in, determine that the method for change of current variation joint is: enumerate change of current variation joint, solve change of current bus electricity
Pressure amplitude value, the change of current busbar voltage amplitude closest to AC power flow result is straight-flow system Load Flow Solution result, corresponding gear
Solving value for change of current variation joint gear, the accurate simulation DC transmission system change of current becomes the control strategy automatically adjusted.
Above-mentioned steps 2) in AC system solution procedure arranges change of current bus for balance node, reflect in islanded system
Power flow changing adjusts, by direct current conveying power, the practical situation balanced.
Above-mentioned steps 6) check that inverter Trigger Angle, beyond properly functioning limits value, automatically engages reactive power compensation group
Number, the control strategy of accurate simulation DC transmission system reactive power compensation group automatic switching.
Above-mentioned steps 9) in inject the reality as direct current transportation using the change of current bus active power of AC system Load flow calculation
Border conveying power, and using its difference with DC reference value as the regulated quantity of direct current frequency limitation function, clearly reflect straight
The FREQUENCY CONTROL function of stream transmission system.
The present invention is directed to the operation characteristic of direct current transportation islanded system, it is proposed that the method that ac and dc systems alternately solves,
Using DC converter station bus as balance node in isolated island AC system solution procedure, use regular alternating current tidal current analysis method
Obtain active power and the reactive power trend of change of current bus.Using the active power of change of current bus and reactive power trend as directly
The input of stream transmission system, solves the operation variable within DC transmission system, and anti-release change of current busbar voltage, as exchange system
The input of system iteration.The present invention compared with prior art, has the advantage that
1) the present invention is directed to by electromotor, direct current transportation sending end current conversion station, electromotor to direct current transportation sending end current conversion station
The islanded system of alternating current circuit composition, has taken into full account that straight-flow system controls function fast lifting or reduction by its frequency limitation
Dc power maintains the effect of direct current transportation sending end islanded system active balance.
2) direct current transportation sending end islanded system is divided into AC system and straight-flow system by the present invention, and change of current bus is as friendship
Streaming system and the interface of straight-flow system.The AC system tide model being different from routine uses electromotor as balance node, orphan
Island AC system tidal current analysis uses change of current bus equivalence direct current transportation converting plant, and using change of current bus as balance node, adopts
After solving by conventional AC system flow calculation program, the active power that change of current bus is absorbed from AC system and idle merit
Rate is as the input of straight-flow system Load Flow Solution.
3) present invention is during straight-flow system Load Flow Solution, injects straight-flow system according to AC system by change of current bus
Active power, the reactive power Switching Strategy table that determines when searching direct current transportation design, determine that the minimum needing to put into is idle
Power back-off group number.Sending end is solved according to direct current conveying power, inverter reactive power consumption, DC voltage, DC current
The Trigger Angle of inverter, and according to it whether beyond properly functioning limits value, it may be judged whether need to automatically engage reactive power and mend
Repay group's number.By enumerating change of current variation joint, solve change of current busbar voltage amplitude, and balance node as AC system
Voltage magnitude, return AC system iterative.
4) present invention can in detail analog DC transmission system frequency limitation control function, current conversion station reactive power mend
The function that the group of repaying automatically engages, the function that change of current variation joint adjusts automatically, more accurately reflect direct current transportation islanded system
Practical situation, it is possible to the more efficient planning instructing direct current transportation islanded system and operation.
Accompanying drawing explanation
Fig. 1 is that in direct current transportation sending end islet operation system, ac and dc systems divides schematic diagram.
In figure, UacFor change of current busbar voltage amplitude, PacAnd QacThe active power absorbed from AC system for change of current bus and
Reactive power, QcFor wave filter reactive power compensation amount, PdcActive power, Q is carried for straight-flow systemdcIdle for DC converter
Power consumption.
Fig. 2 is the flowchart of the inventive method.
Detailed description of the invention
Referring to the drawings 1 and 2, Fig. 1 is that in direct current transportation sending end islet operation system, ac and dc systems divides schematic diagram.To send
End islanded system, with change of current bus as interface, is divided into AC system and straight-flow system.Fig. 2 be the inventive method realize flow process
Figure, is described in detail the method for the present invention below:
1) AC system and straight-flow system are divided
Use AC system trend and straight-flow system trend alternating iteration method for solving, need sending end isolated island shown in Fig. 1
System is divided into AC system and straight-flow system, and change of current bus is as AC system and the interface of straight-flow system.
The AC system tide model being different from routine uses electromotor as balance node, and isolated island AC system trend is divided
Analysis uses change of current bus equivalence direct current transportation converting plant, and using change of current bus as balance node.In straight-flow system Load Flow Solution,
Use change of current bus equivalence AC system, using change of current bus active power and reactive power as input.
2) isolated island AC system trend is solved
Set balance node voltage phase angle as 0, voltage magnitude is(k is iterations), meets
For 500kV electrical network, usual Umin=500, Umax=550；Electromotor nodes all in islanded system are set to PV node, if
The active power determining electromotor node is exerted oneself and terminal voltage amplitude, and enters to go out as reactive power with stagnant phase ability mutually using electromotor
Power upper lower limit value.Use conventional AC system flow calculation program to solve isolated island AC system trend, obtain having of each node
Merit power, reactive power, voltage magnitude and phase angle.The active power that change of current bus absorbs from AC systemAnd reactive powerInput as straight-flow system Load Flow Solution.
3) ac and dc systems reactive power exchange capacityOut-of-limit judgement
AC system is injected by the change of current bus reactive power of straight-flow systemCheck,
(A) ifProceed to step 4)
(B) ifProceed to step 2)
(C) ifProceed to step 2)
Wherein Qacmax,QacminThe upper limit of the ac and dc systems reactive power exchange set when being respectively direct current islet operation
Value and lower limit；Δ U is Voltage Cortrol amplitude, rule of thumb can take 2.5kV.
4) DC converter reactive power compensation group number is determined
During straight-flow system Load Flow Solution, with step 2) in solveAs direct current in kth time iterative process
PowerAccording toThe reactive power Switching Strategy table determined when searching direct current transportation design, determines that needs put into
Little reactive power compensation group number Nmin, make N=Nmin, N represents the reactive power compensation group number of input.
5) DC converter station reactive power consumption is determined
Use formulaCalculating change of current busbar voltage isTime reactive power compensation amount
Wherein QfFor the little pool-size of the reactive power compensation under rated voltage level.Meter and AC system send into the idle merit of straight-flow system
Rate, obtain the reactive power consumption of DC converterI.e.
6) inverter Trigger Angle amplitude limit checks
(A) according to formulaCalculateWherein UdIt is that known direct current is properly functioning
Voltage；
(B) according to formulaCalculate inverter Trigger Angle ∝k, wherein XcBecome for the change of current
Reactance, DC current
(C) if ∝min≤∝k≤∝max, then step 7 is entered)；Otherwise increase wave filter switching quantity, set N=N+
1, if N≤Nmax(NmaxBe DC converter station configuration reactive power small set), return step 5) again calculate current conversion station without
Merit power consumption, otherwise trend dissipates, and exits calculating.
7) change of current variation joint is determined
Enumerate change of current variation joint TTap, i, i is change of current variation joint gear, i=1 ... TTap, max.According to formulaSolveClosest'sFor the value that solves of straight-flow system, the corresponding change of current
Device gear is that tap gear solves value.
8) trend convergence judges
If(err is the least numerical value pre-set), then trend convergence, enter
Step 9), the change of current busbar voltage amplitude otherwise solved with straight-flow systemFor the setting value of AC system balance node, return
Return step 2)
9) direct current frequency limit value function sets
Alternating current-direct current islanded system trend restrains, according toSolve direct current transportation frequency limitation power
Regulated quantity.
Claims (9)
1. a direct current transportation sending end islanded system tidal current analysis method, it is characterised in that transport at DC transmission system sending end isolated island
During row system load flow calculates, active power balance in meter and DC transmission system frequency limitation control quick control islanded system
Effect, is chosen for DC transmission system sending end change of current bus nodes balancing node, comprises the steps:
1) AC system and straight-flow system are divided；
2) isolated island AC system trend is solved；
3) AC system and the out-of-limit judgement of straight-flow system reactive power exchange capacity, injects straight to AC system by change of current bus
The reactive power of streaming system checks, if reactive power exchange is beyond properly functioning setting value, then adjusts change of current busbar voltage
Amplitude, proceeds to step 2) proceed, otherwise carry out step 4)；
4) DC converter reactive power compensation group number is determined；
5) DC converter station reactive power consumption is determined；
6) inverter Trigger Angle amplitude limit checks, consumes reactive power, direct current conveying active power, given unidirectional current according to inverter
Pressure asks for inverter Trigger Angle, if in normal operation range limit value, carries out step 7), otherwise increases reactive power compensation group
Number, returns step 5)；
7) change of current variation joint is determined；
8) trend convergence judges, if the change of current busbar voltage amplitude difference of AC system and straight-flow system Load Flow Solution is less than presetting
Value, then trend convergence, enter step 9), otherwise balance for AC system with the change of current busbar voltage amplitude that straight-flow system solves
The voltage magnitude of node, returns step 2)；
9) direct current frequency limit value function sets.
Direct current transportation sending end islanded system tidal current analysis method the most according to claim 1, it is characterised in that above-mentioned steps
1), in, divide AC system and straight-flow system be that direct current transportation sending end islanded system is divided into AC system and straight-flow system,
Change of current bus is as AC system and the interface of straight-flow system；Isolated island AC system tidal current analysis uses change of current bus equivalence direct current
Transmission of electricity converting plant, and using change of current bus as balance node, in straight-flow system Load Flow Solution, use change of current bus equivalence to exchange system
System, using change of current bus active power and reactive power as input.
Direct current transportation sending end islanded system tidal current analysis method the most according to claim 1, it is characterised in that above-mentioned steps
2), in, solving isolated island AC system trend is to use conventional AC system flow calculation program to solve isolated island AC system tide
Stream, the active power absorbed from AC system by change of current bus and reactive power, as the input of straight-flow system Load Flow Solution.
Direct current transportation sending end islanded system tidal current analysis method the most according to claim 1, it is characterised in that above-mentioned steps
4), in, determine that DC converter reactive power compensation group number injects straight-flow system according to AC system by change of current bus
Active power, i.e. carries power according to direct current, the reactive power compensation Switching Strategy table determined when searching direct current transportation design, really
The fixed minimum reactive power compensation group number needing to put into, performance of filter and definite value are wanted by accurate simulation DC transmission system
Ask.
Direct current transportation sending end islanded system tidal current analysis method the most according to claim 1, it is characterised in that above-mentioned steps
5), in, DC converter station reactive power consumption=current conversion station reactive power compensation is idle+AC system send into straight-flow system idle
Power.
Direct current transportation sending end islanded system tidal current analysis method the most according to claim 1, it is characterised in that above-mentioned steps
7) in, determine that the method for change of current variation joint is: enumerate change of current variation joint, solve change of current busbar voltage amplitude, closest to handing over
The change of current busbar voltage amplitude of stream power flow solutions is straight-flow system Load Flow Solution result, and corresponding gear is change of current variation joint shelves
Position solves value, and the accurate simulation DC transmission system change of current becomes the control strategy automatically adjusted.
Direct current transportation sending end islanded system tidal current analysis method the most according to claim 1, it is characterised in that above-mentioned steps
2) arranging change of current bus in AC system solution procedure is balance node, reflects power flow changing in islanded system and passes through direct current
Conveying power adjusts the practical situation balanced.
Direct current transportation sending end islanded system tidal current analysis method the most according to claim 1, it is characterised in that above-mentioned steps
6) check that inverter Trigger Angle, beyond properly functioning limits value, automatically engages reactive power compensation group number, accurate simulation direct current
The control strategy of transmission system reactive power compensation group automatic switching.
Direct current transportation sending end islanded system tidal current analysis method the most according to claim 1, it is characterised in that above-mentioned steps
9) in, the change of current bus active power using AC system Load flow calculation injects the actual fed power as direct current transportation, and by it
With the difference of DC reference value as the regulated quantity of direct current frequency limitation function, clearly reflect the frequency control of DC transmission system
Function processed.
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| CN105762808B (en) * | 2016-04-07 | 2018-04-13 | 国网福建省电力有限公司 | A kind of electric network swim on-line optimizing and controlling method based on flexible DC transmission technology |
| CN108802567B (en) * | 2018-06-01 | 2021-08-10 | 国网浙江省电力有限公司宁波供电公司 | Island monitoring method for new energy power supply |
| CN110601200A (en) * | 2019-08-16 | 2019-12-20 | 南京理工大学 | Direct-current power grid load flow calculation method considering current load flow controller |
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