CN107579530A - The low frequency deloading method and low-frequency load reduction control system of a kind of power network - Google Patents
The low frequency deloading method and low-frequency load reduction control system of a kind of power network Download PDFInfo
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Abstract
Present invention is disclosed a kind of low frequency deloading method of power network and low-frequency load reduction control system, and generator end frequency, monitoring frequency stability state are obtained by wide area measurement device；When system frequency is quickly fallen because of power shortage, active power shortage is estimated；Electric automobile administrative center calculates scheduling capacity and total activation capacity at different levels, reports control centre according to electronic vehicle attitude；Control centre formulates off-load plan and issues off-load instruction according to power shortage and scheduling capacity；Administrative center is instructed by off-load assigns off-load task to electric automobile；Terminal is controlled to control electric automobile charge/discharge, online UFLS relay aids in off-load according to instruction according to off-load task.The present invention dispatches electric automobile resource during UFLS, and decentralised control is managed concentratedly by electric automobile, is auxiliary with the action of online UFLS, complete UFLS, it is quick to suppress frequency drop, while optimizing allocation of resources, improve the stability of a system and economy.
Description
Technical field
Embodiments of the invention are related to intelligent power grid technology, a kind of low frequency deloading method in particular to power network and
Low-frequency load reduction control system.
Background technology
Frequency stabilization is the important leverage of maintenance system safe and stable operation.Extensive power shortage can cause system frequency
Rapid to decline, UFLS is to prevent frequency from quickly falling and prevent an important regulating and controlling measure of collapse of frequency.UFLS
By by wheel load shedding, making system reach new active power balance, ensureing system safe and stable operation.
Electric automobile is a kind of new traffic tool, because can alleviating energy crisis and environmental pollution and by national governments energetically
Help.As a series of encouragement policies of China are put into effect, electric automobile is constantly promoted, and electric automobile access power network is also increasingly general
And.Electric automobile bears charging load and mobile energy-storage units double grading, has fast response time, regulation performance is good, adjustable
The features such as capacity is big is spent, the important off-load resource of intelligent grid Demand-side can be turned into.
Traditional low-frequency off-load realizes power-balance by cutting off load, fails to make full use of electric automobile resource.Therefore, such as
Fruit effectively utilizes electric automobile resource during UFLS, rational UFLS scheme is formulated, to the safety of power network
Stable operation is significant.
The content of the invention
It is an object of the invention to for drawbacks described above of the prior art, there is provided and it is a kind of towards active intelligent grid, and
Low frequency deloading method using electric automobile as main object,
For achieving the above object, the present invention adopts the following technical scheme that, the specific steps of the program have：
1) mains frequency is measured, and power system active power is calculated according to generator end frequency and frequency change rate and lacked
Volume；
2) according to the type of electric automobile and input priority, electric automobile scheduling capacity is divided into some levels, then
Further according to the initial state-of-charge of electric automobile, it is expected state-of-charge, current charge/discharge power and maximum charge/discharge power, calculate
Electric automobile scheduling capacity at different levels and total activation capacity；
3) subtract using the electric automobile total activation capacity of the active power shortage of step 1) and step 2) as according to formulation low frequency
Plan is carried, and issues off-load instruction；
4) electric automobile administrative center instructs according to off-load, sends off-load task to each electric automobile, electric automobile is pressed
The task charge/discharge of distribution, online UFLS relay auxiliary movement, complete UFLS.
The present invention also provides following attached technical scheme：
Further, in step 1) according to generator end frequency and the expression formula of frequency change rate estimating system power shortage
It is shown as：
In formula：
In above-mentioned formula, Δ P is power shortage total in system；fcFor center of inertia frequency；Hi-sysFor i-th generator
Inertia time constant；SiFor i-th generator capacity；Sb-sysFor system nominal capacity.
Further, the electric automobile scheduling capacity at different levels and total activation capacity calculation methods in step 2) are as follows：
The principle reduced as far as possible to customer impact is followed, determines that electric automobile type and input are preferential according to networking demand
Sequentially, electric automobile scheduling capacity is divided into level Four.The first order is the peak power electric discharge of electric discharge class electric automobile, and the second level is to fill
Electric class electric automobile stops charging, and for the third level to maintain electricity class to be discharged with peak power, the fourth stage is charge type electric automobile
Discharged with peak power；First order highest priority, other grade of priority is successively.
The expression formula of above-mentioned level Four scheduling capacity and total activation capacity is shown as：
PEV,4=n*Pmax
PEV=PEV,1+PEV,2+PEV,3+PEV,4
In above-mentioned formula, PmaxFor electric automobile maximum discharge power, PEV,1For first order schedulable capacity；Z is electric discharge class
Electric automobile quantity；Pd,iFor the i-th electric automobile present discharge power of class that discharges；PEV,2For second level schedulable capacity；Pc,i
For i-th current charge power of electric automobile of charge type；N is charge type electric automobile quantity；PEV,3Hold for third level schedulable
Amount；Pm,iTo maintain the current charge/discharge power of i-th electric automobile of electricity class；K is maintenance electricity class electric automobile quantity；PEV,4
For fourth stage schedulable capacity；PEVFor electric automobile total activation capacity.
Further, the formulating rules of the UFLS plan of step 3)：
To prevent from cutting, UFLS resection is calculated as follows：
Pshed=1.05* (Δ P-Pthr)
In formula：PshedTo need the load cut off；PthrAllow power shortage minimum value for system；
To make full use of electric automobile resource, off-load task is dispatched to electric automobile as far as possible when formulating off-load plan,
Work as Pshed≤PEVWhen, off-load task is all dispatched to electric automobile, works as Pshed＞ PEVWhen, electric automobile is all put into, remainder
Divide by low frequency load shedding equipment assisted resection；Off-load mode uses to be put into by wheel, if the wheel of wheel 5, time delay substantially is set to 0.35 second,
If the first, two wheel resection are 0.25Pshed, three, four-wheel resection be 0.2Pshed, the 5th wheel resection is 0.1Pshed, basic wheel
Electric automobile resource is called by wheel second priority, if electric automobile inadequate resource, restarts UFLS, if the special wheel of wheel 3, each wheel
Resection is 0.1Pshed, 15 seconds time delays, differential 5 seconds, special wheel paid the utmost attention to electricity according to the situation after basic wheel input
Electrical automobile resource, if insufficient, restart low frequency and subtract.
Further, the electric automobile off-load task of step 4) send rule it is as follows：
Administrative center is determined the resection of electric automobile off-load task and each round by off-load instruction, is dispatched in each round
Electric automobile dispatching priority step -by -step switch as defined in right 2 in journey；In scheduling process, if the current schedulable capacity of this level is small
In the round resection, then this grade of schedulable capacity is all put into, and calls next stage schedulable capacity；If this level is currently adjustable
Degree capacity is more than the round switching amount, then sends off-load task by electric automobile dispatching, and off-load tasking method is as follows：
In above-mentioned formula,The maximum discharge power allowed for i-th electric automobile in I level；PiFor i-th electricity
The current charge/discharge power of electrical automobile；Pi IFor schedulable capacity of i-th electric automobile in I level；Pshed,IFor send to
The off-load task total amount of I level；Ps,iFor off-load task in i-th electric automobile I level.
The present invention also provides a kind of low-frequency load reduction control system, and the system includes grid control centre, electric automobile management
Center, online UFLS relay and interface circuit, each interface circuit include communication module and V2G control modules,
Wherein, communication module is current for gathering electric automobile respectively with electric automobile administrative center, V2G control module two-way communications
Charge/discharge power, maximum charge/discharge power, current SOC, it is expected SOC, the maximum and minimum SOC allowed, and determine current
The type of electric automobile, schedulable capacity, and these information are uploaded to administrative center, while receive electric automobile administrative center
Sending for task；V2G control modules are used to instruct control electric automobile discharge and recharge according to discharge and recharge；Electric automobile administrative center is also
With control centre's two-way communication, for calculating and uploading scheduling capacity and total activation capacity at different levels, and off-load task is sent.
Compared to prior art, advantage of the invention is that：The low frequency deloading method and low frequency for disclosing a kind of power network subtract
Borne control system, this method are the scheduling electric automobile resources during UFLS, are managed concentratedly by electric automobile scattered
Control, it is auxiliary with the action of online UFLS, completes UFLS, it is quick to suppress frequency drop, what is optimized allocation of resources
Meanwhile improve the stability of a system and economy.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of Related Art
The required accompanying drawing used is briefly described, it should be apparent that, drawings in the following description merely relate to some of the present invention
Embodiment, not limitation of the present invention.
Fig. 1 is the UFLS system frame structure figure of the low frequency deloading method of present pre-ferred embodiments.
Fig. 2 is the flow chart of the low frequency deloading method of present pre-ferred embodiments.
Embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Apply mode and make further nonrestrictive detailed description to technical solution of the present invention.
The present invention disperses networking feature based on electric automobile, it is proposed that the low frequency deloading method using electric automobile as object,
And establish the control system that electric automobile participates in UFLS.See Fig. 1, the system principle framework includes：Including power grid control
Center, electric automobile administrative center, UFLS relay and interface circuit, each interface circuit include communication module
With V2G control modules, wherein, communication module respectively with electric automobile administrative center, V2G control module two-way communications, for adopting
Collect the current charge/discharge power of electric automobile, maximum charge/discharge power, current SOC, it is expected SOC, allow it is maximum and minimum
SOC, and the type of current electric automobile, schedulable capacity are determined, and these information are uploaded to administrative center, while receive electricity
The task that electrical automobile administrative center sends；V2G control modules are used to instruct control electric automobile discharge and recharge according to discharge and recharge；It is electronic
Also with control centre's two-way communication, for calculating and uploading scheduling capacity and total activation capacity at different levels, and send at automobile management center
Send off-load task.Administrative center is responsible for calculating and uploads scheduling capacity and total activation capacity at different levels, and sends off-load task.Control
It is responsible for calculating vacancy, receives schedulable capacity, formulate UFLS plan, issue off-load instruction in center.
In such scheme, the low frequency deloading method principle towards active intelligent grid using electric automobile as main object
It is：When power shortage occurs, frequency is quickly fallen, control centre is used to according to generator end frequency, frequency change rate, generator
Property time constant estimation power shortage, and combine electric automobile schedulable capacity and formulate off-load plan, and issue off-load instruction；Pipe
Reason center off-load task is sent according to off-load instruction；Electric automobile is by assignment off-load task charge/discharge, online UFLS relay
Device auxiliary movement, complete UFLS.
In conjunction with accompanying drawing 1 and accompanying drawing 2, the inventive method is as follows：
According to the demand of automobile user and its networking feature, electric automobile cluster classification model is established, and build base
The control framework of UFLS is participated in the electric automobile of decentralised control centralized management, then performs following steps：
Step 1：Electric network state is monitored, whether determination frequency is normal, subtracts if frequency in normal range (NR), does not start low frequency
Carry；If frequency is less than threshold value, start UFLS, perform step 2；
Step 2：Mains frequency is measured, according to generator end frequency, frequency change rate, estimation power system active power lacks
Volume；
Step 3：Electric automobile administrative center is according to the initial state-of-charge of electric automobile, expectation state-of-charge, current discharge charge
Electrical power, maximum charge/discharge power, calculate electric automobile scheduling capacity at different levels and total activation capacity；
Step 4：Control centre formulates UFLS plan, and issue according to power shortage and electric automobile scheduling capacity
Off-load instructs；
Step 5：Electric automobile administrative center is instructed according to off-load, and off-load task, electronic vapour are sent to each electric automobile
Car online UFLS relay auxiliary movement, completes UFLS by the task charge/discharge of distribution；
Step 6：Step 1 is re-executed again, is monitored electric network state, is judged whether mains frequency is normal.
In the above-described embodiment, the evaluation method of system power vacancy is as follows：
In formula：
In above-mentioned formula, Δ P is power shortage total in system；fcFor center of inertia frequency；Hi-sysFor i-th generator
Inertia time constant；SiFor i-th generator capacity；Sb-sysFor system nominal capacity.
The ladder scheduling capacity and total activation capacity calculation methods of electric automobile are as follows：
The principle reduced as far as possible to customer impact is followed, determines that electric automobile type and input are preferential according to networking demand
Sequentially, electric automobile scheduling capacity is divided into level Four.The first order is the peak power electric discharge of electric discharge class electric automobile, and the second level is to fill
Electric class electric automobile stops charging, and for the third level to maintain electricity class to be discharged with peak power, the fourth stage is charge type electric automobile
Discharged with peak power；First order highest priority, other grade of priority are that level Four scheduling capacity and total activation hold below successively
Measure computational methods：
PEV,4=n*Pmax
PEV=PEV,1+PEV,2+PEV,3+PEV,4
In above-mentioned formula, PmaxFor electric automobile maximum discharge power, PEV,1For first order schedulable capacity；Z is electric discharge class
Electric automobile quantity；Pd,iFor the i-th electric automobile present discharge power of class that discharges；PEV,2For second level schedulable capacity；Pc,i
For i-th current charge power of electric automobile of charge type；N is charge type electric automobile quantity；PEV,3Hold for third level schedulable
Amount；Pm,iTo maintain the current charge/discharge power of i-th electric automobile of electricity class；K is maintenance electricity class electric automobile quantity；PEV,4
For fourth stage schedulable capacity；PEVFor electric automobile total activation capacity.
The formulating rules of UFLS plan：
To prevent from cutting, UFLS resection is calculated as follows：
Pshed=1.05* (Δ P-Pthr)
In formula：PshedTo need the load cut off；PthrAllow power shortage minimum value for system；
To make full use of electric automobile resource, off-load task is dispatched to electric automobile as far as possible when formulating off-load plan,
Work as Pshed≤PEVWhen, off-load task is all dispatched to electric automobile, works as Pshed＞ PEVWhen, electric automobile is all put into, remainder
Divide by low frequency load shedding equipment assisted resection；Off-load mode uses to be put into by wheel, if the wheel of wheel 5, time delay substantially is set to 0.35 second,
If the first, two wheel resection are 0.25Pshed, three, four-wheel resection be 0.2Pshed, the 5th wheel resection is 0.1Pshed, basic wheel
Electric automobile resource is called by wheel second priority, if electric automobile inadequate resource, restarts UFLS, if the special wheel of wheel 3, each wheel
Resection is 0.1Pshed, 15 seconds time delays, differential 5 seconds, special wheel paid the utmost attention to electricity according to the situation after basic wheel input
Electrical automobile resource, if insufficient, restart UFLS.
Electric automobile off-load task sends rule as follows：
Administrative center is determined the resection of electric automobile off-load task and each round by off-load instruction, is dispatched in each round
Electric automobile dispatching priority step -by -step switch as defined in right 2 in journey；In scheduling process, if the current schedulable capacity of this level is small
In the round resection, then this grade of schedulable capacity is all put into, and calls next stage schedulable capacity；If this level is currently adjustable
Degree capacity is more than the round switching amount, then sends off-load task by electric automobile dispatching, and off-load tasking method is as follows：
In above-mentioned formula,The maximum discharge power allowed for i-th electric automobile in I level；PiFor i-th electricity
The current charge/discharge power of electrical automobile；Pi IFor schedulable capacity of i-th electric automobile in I level；Pshed,IFor send to
The off-load task total amount of I level；Ps,iFor off-load task in i-th electric automobile I level.
In summary, the present invention disperses networking feature based on electric automobile, it is proposed that the low frequency using electric automobile as object
Off-load method, establish the control framework that electric automobile participates in UFLS；Framework include batteries of electric automobile, communication module,
V2G controls, administrative center, control centre and online UFLS relay.When power shortage occurs, frequency is quickly fallen,
Power shortage is estimated according to generator end frequency, frequency change rate, generator inertia time constant by control centre, and combines electronic
Automobile schedulable capacity formulates off-load plan, and issues off-load instruction；Administrative center sends off-load task according to off-load instruction；Electricity
Electrical automobile completes UFLS by the online UFLS relay auxiliary movement of off-load task control charge/discharge is assigned.The present invention
During UFLS, priority scheduling electric automobile resource, and online UFLS relay auxiliary movement is called, complete low
Frequency off-load, cutting load amount can be reduced while quickly suppressing frequency and falling, optimized allocation of resources, improve the stability of system with
Economy.
It is pointed out that the technical concepts and features of above-mentioned preferred embodiment only to illustrate the invention, its object is to
Allow person skilled in the art to understand present disclosure and implement according to this, the protection of the present invention can not be limited with this
Scope.Any equivalent change or modification in accordance with the spirit of the invention, it should all be included within the scope of the present invention.
Claims (7)
1. a kind of low frequency deloading method of power network, it is characterised in that methods described is towards active intelligent grid, and with electric automobile
For object, it comprises the following steps：
1) mains frequency is measured, and power system active power shortage is calculated according to generator end frequency and frequency change rate；
2) according to the type of electric automobile and input priority, electric automobile scheduling capacity is divided into some levels, then root again
According to the initial state-of-charge of electric automobile, it is expected state-of-charge, current charge/discharge power and maximum charge/discharge power, calculate electronic
Automobile scheduling capacity at different levels and total activation capacity；
3) using the electric automobile of the active power shortage of step 1) and step 2) scheduling capacity at different levels and total activation capacity as foundation
UFLS plan is formulated, and issues off-load instruction；
4) electric automobile administrative center instructs according to off-load, sends off-load task to each electric automobile, electric automobile is by distribution
Task charge/discharge, online UFLS relay auxiliary movement, complete UFLS.
2. the low frequency deloading method of power network according to claim 1, it is characterised in that in the step 1) according to generating
Generator terminal frequency and the expression formula of frequency change rate estimating system power shortage are shown as：
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In above-mentioned formula, Δ P is power shortage total in system；fcFor center of inertia frequency；Hi-sysFor i-th generator inertia
Time constant；SiFor i-th generator capacity；Sb-sysFor system nominal capacity.
3. the low frequency deloading method of power network according to claim 2, it is characterised in that the step 2) according to networking need
The type for determining electric automobile and input priority are asked, electric automobile scheduling capacity is divided into some levels includes：By electronic vapour
Car scheduling capacity is divided into level Four, and the first order is discharged for electric discharge class electric automobile with peak power, and the second level is the electronic vapour of charge type
Car stop charging, the third level for maintain electricity class electric automobile discharged with peak power, the fourth stage be charge type electric automobile with
Peak power is discharged.
4. the low frequency deloading method of power network according to claim 3, it is characterised in that the electric automobile of the step 2) is each
The expression formula of level scheduling capacity and total activation capacity is shown as：
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PEV,4=n*Pmax；
PEV=PEV,1+PEV,2+PEV,3+PEV,4；
In above-mentioned formula, PmaxFor electric automobile maximum discharge power, PEV,1For first order schedulable capacity；Z is electronic for electric discharge class
Automobile quantity；Pd,iFor the i-th electric automobile present discharge power of class that discharges；PEV,2For second level schedulable capacity；Pc,iTo fill
Electric i-th current charge power of electric automobile of class；N is charge type electric automobile quantity；PEV,3For third level schedulable capacity；
Pm,iTo maintain the current charge/discharge power of i-th electric automobile of electricity class；K is maintenance electricity class electric automobile quantity；PEV,4For
Fourth stage schedulable capacity；PEVFor electric automobile total activation capacity.
5. the low frequency deloading method of power network according to claim 4, it is characterised in that the electric automobile of the step 3) is low
The expression formula of frequency off-load resection is shown as：
Pshed=1.05* (Δ P-Pthr)
In above-mentioned formula, PshedTo need the load cut off；PthrAllow power shortage minimum value for system.
6. the low frequency deloading method of power network according to claim 5, it is characterised in that the step 4) gives each electronic
Automobile sends off-load task to include：
Work as Pshed≤PEVWhen, off-load task is all dispatched to electric automobile；
Work as Pshed＞ PEVWhen, electric automobile is all put into, and remainder is by low frequency load shedding equipment assisted resection；
If the current schedulable capacity of this level is less than the round resection, this grade of schedulable capacity is all put into, and is called next
Level schedulable capacity；
If the current schedulable capacity of this level is more than the round switching amount, off-load task is sent by electric automobile dispatching, is subtracted
It is as follows to carry tasking method：
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<mi>i</mi>
</mrow>
<mi>I</mi>
</msubsup>
<mo>-</mo>
<msub>
<mi>P</mi>
<mi>i</mi>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>P</mi>
<mrow>
<mi>s</mi>
<mo>,</mo>
<mi>i</mi>
</mrow>
</msub>
<mo>=</mo>
<msub>
<mi>P</mi>
<mrow>
<mi>s</mi>
<mi>h</mi>
<mi>e</mi>
<mi>d</mi>
<mo>,</mo>
<mi>I</mi>
</mrow>
</msub>
<mo>*</mo>
<mfrac>
<msubsup>
<mi>P</mi>
<mi>i</mi>
<mi>I</mi>
</msubsup>
<msub>
<mi>P</mi>
<mrow>
<mi>E</mi>
<mi>V</mi>
<mo>,</mo>
<mi>I</mi>
</mrow>
</msub>
</mfrac>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
In above-mentioned formula,The maximum discharge power allowed for i-th electric automobile in I level；PiFor i-th electronic vapour
The current charge/discharge power of car；Pi IFor schedulable capacity of i-th electric automobile in I level；Pshed,II level is given to send
Off-load task total amount；Ps,iFor off-load task in i-th electric automobile I level.
7. the low-frequency load reduction control system of the low frequency deloading method according to any one of claim 1 to 6, it is characterised in that：
The system includes grid control centre, electric automobile administrative center, UFLS relay and interface circuit, each interface
Circuit all includes communication module and V2G control modules,
Wherein, communication module respectively with electric automobile administrative center, V2G control module two-way communications, for gathering electric automobile
Current charge/discharge power, maximum charge/discharge power, current SOC, it is expected SOC, the maximum and minimum SOC allowed, and determine
The type of current electric automobile, schedulable capacity, and these information are uploaded to administrative center, while receive electric automobile management
The task that center is sent；
V2G control modules are used to instruct control electric automobile discharge and recharge according to discharge and recharge；
Electric automobile administrative center also with control centre's two-way communication, holds for calculating and uploading scheduling capacities and total activation at different levels
Amount, and send off-load task.
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