CN105305392B - Short circuit calculation symmetrical component method suitable for the type IIDG power distribution network of control containing voltage - Google Patents
Short circuit calculation symmetrical component method suitable for the type IIDG power distribution network of control containing voltage Download PDFInfo
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Abstract
The invention discloses a kind of short circuit calculation symmetrical component method suitable for the type IIDG power distribution network of control containing voltage, when including the following steps: to analyze power distribution network unbalanced fault, voltage-type IIDG three-phase mean power and positive-negative sequence net power relation；Establish the short circuit calculation order components model that meter and voltage-type IIDG are symmetrically controlled；In conjunction with the reciprocation of voltage-type IIDG and the positive and negative sequence network of power distribution network, the fault current changing rule of voltage-type IIDG is obtained；It proposes the symmetrical components iterative algorithm of the calculating power distribution network of IIDG containing voltage-type short circuit current, calculates the short circuit current of the power distribution network of IIDG containing voltage-type.This method, which carries out short circuit calculation using phase component method, can effectively reduce the complexity and solution scale of phase components method；And the calculating of IIDG short circuit current order components can be used for distribution protection and its control under power distribution network unbalanced fault.
Description
Technical field
The present invention relates to distributed generation system technical fields, more particularly to one kind to be suitable for the power distribution network of IIDG containing voltage-type
Short circuit calculation symmetrical component method.
Background technique
The access of distributed power generation will change electric network swim and short circuit current distribution, wherein inverse distributed power
(Inverter Interfaced Distributed Generator, IIDG) with the control performance of fast and flexible, in power distribution network
It is widely applied in micro-capacitance sensor distributed power generation.In order to realize that grid-connected and island mode smoothly switches, IIDG is usual in micro-capacitance sensor
Using sagging control, constant voltage constant frequency control.And the IIDG that is incorporated into the power networks for accessing power distribution network, then mainly use invariable power control
Its controller can be divided into voltage-controlled type and current-control type (abbreviation voltage-type by the difference of IIDG inner ring tracking electricity by system
Or current mode).Compared with synchronous generator, there is IIDG different fault signatures to match especially for voltage-type IIDG
To occur typical transient state and transient process after grid short circuit.The accident analysis of IIDG access power distribution network is planning and designing, protects
The basis of shield adjusting and stable operation, but the equivalent voltage source method of the standards such as IEC60909 is used to be calculated, due to not counting
And the control characteristic short circuit calculation resultant error of IIDG is larger, it is therefore desirable to which distribution network failure electric current of the research containing IIDG parses meter
Calculation method.
The reciprocation of IIDG and network determines that its short circuit current responds when power distribution network short circuit, time-domain-simulation, physical analogy
It is to study the common method of IIDG fault characteristic, but be difficult to obtain analytic solutions.Have and researchs and proposes the calculating of distribution network failure containing DG
The addition method, but do not account for the dynamic process of IIDG control.There are also researchs to think that current mode IIDG short circuit current is exponentially regular
Variation calculates its dynamic response according only to IIDG steady-state current before and after distribution network failure, cannot accurately analyze the temporary of short circuit current
State process and the out-of-limit moment for determining short circuit current.There is document to control in transmission function and failure for voltage-type IIDG to export
The phase component model for calculating its each phase short circuit current size is established in the variation of power.Due to not considering the phase of IIDG phase current
Variation, the short circuit current order components of voltage-type IIDG when can not calculate power distribution network unbalanced fault.
The complexity and solution scale of phase components method can be effectively reduced by carrying out short circuit calculation using phase component method, and
The calculating of IIDG short circuit current order components can be used for distribution protection and its control under power distribution network unbalanced fault.Therefore,
The order components analytic modell analytical model for establishing voltage-type IIDG short circuit calculation, is more advantageous to IIDG control mode and distribution network failure analysis side
The combination of method.
Summary of the invention
Aiming at the above shortcomings existing in the prior art, the present invention provides one kind to be suitable for the type of control containing voltage IIDG distribution
The short circuit calculation symmetrical component method of net, this method carry out short circuit calculation using phase component method, can effectively reduce phase components method
Complexity and solution scale；Method provided by the invention can be added in the calculation of short-circuit current of conventional electrical distribution net, while
It can count and the current limliting of IIDG constrains.
In order to solve the above-mentioned technical problem, present invention employs following technical solutions:
When analyzing power distribution network unbalanced fault first, voltage-type IIDG three-phase mean power and positive-negative sequence net power relation；
Establish the short circuit calculation order components model that meter and voltage-type IIDG are symmetrically controlled；In conjunction with voltage-type IIDG and power distribution network positive-negative sequence net
The reciprocation of network obtains the fault current changing rule and recurrence formula of voltage-type IIDG；It proposes to calculate IIDG containing voltage-type
Power distribution network short circuit current symmetrical components iterative algorithm, calculate the IIDG containing voltage-type power distribution network short circuit current.
When analyzing power distribution network unbalanced fault, voltage-type IIDG three-phase mean power and positive-negative sequence net power relation, specifically
Steps are as follows:
Voltage-type IIDG three-phase instantaneous power is by its end voltage vector ug=[uga,ugb,ugc] and current phasor ig=[iga,
igb,igc] determine, three phases active power pg=ug·ig, three phase reactive power qg=| ug×ig|；When power distribution network unbalanced fault
When, the end voltage-type IIDG voltage ugWith electric current igIt include positive and negative order components, i.e. ug=ug 1+ug 2, ig=ig 1+ig 2, three-phase is active
Power is the half-period average value of instantaneous active power:
Positive-negative sequence voltage and current apposition ug 1×ig 1And ug 2×ig 2Reversely, the average value of three phase reactive power can be obtained:
θ in formula (1)u 1、θu 2For the positive and negative order components phase angle of the end voltage-type IIDG voltage, θi 1、θi 2Electricity is exported for voltage-type IIDG
Flow positive and negative order components phase angle.
In conjunction with the reciprocation of voltage-type IIDG and the positive and negative sequence network of power distribution network, the fault current for obtaining voltage-type IIDG becomes
Law, the specific steps are as follows:
When the power distribution network short circuit calculation of IIDG containing voltage-type, byCalculate voltage-type IIDG short circuit in the 1st Δ t
Current sequence components initial value, then in k-th of Δ t IIDG short circuit current steady-state component are as follows:
The instantaneous value of formula (3) short circuit currents steady-state component is igi(k)s(t)=Igi(k)scos(ωt+θis), -1 Δ of kth
Voltage-type IIDG short circuit current is set as i in tgi(k-1)(t)=Igi(k-1)cos(ωt+θi), andIIDG when iteration secondary for kth
Built-in potential,Node i open-circuit voltage steady-state value, θis、θiRespectively IIDG steady-state shortcircuit current and temporary short circuit electric current phase
Angle.
If when t=0, short trouble occurs for power distribution network, then voltage-type IIDG short circuit current in k-th of Δ t are as follows:
In formula (4), τgi=(Lii+Lgi)/(Rii+Rgi), Lii、RiiRespectively ZiiInductance and resistance, Lgi、RgiRespectively
ZgiInductance and resistance；
Voltage-type IIDG short circuit current virtual value in k-th of Δ t can be obtained by formula (4) are as follows:
If power outer ring PI transmission function is GPI P(s)=kp P+ki P/ s and GPI Q(s)=kp Q+ki Q/ s, and -1 step-length of kth
The phase angle and amplitude of voltage-type IIDG potential are δ(k-1)And Em(k-1)；Power deviation dPgAnd dQgBuilt-in potential is updated after PI, according to
PI power outer ring can obtain the phase angle and amplitude recurrence formula of i-th voltage-type IIDG built-in potential are as follows:
In formula, kp P、ki P、kp Q、ki QFor the parameter of power outer ring PI transmission function.
As a kind of prioritization scheme of the invention, the symmetrical components for calculating the power distribution network short circuit current of the IIDG containing voltage-type change
For algorithm, the short circuit current of the power distribution network of the IIDG containing voltage-type is calculated, the specific steps are as follows:
1., form original distribution nodal impedance matrix Zo 1And Zo 2, by voltage-type IIDG set value of the power, calculate voltage-type
Built-in potential before IIDG failureFailure front voltageAnd PRE-FAULT CURRENT
2., utilize Zo 1、Zo 2Calculate voltage-type IIDG positive-negative sequence damping time constant τgi 1And τgi 2；
3., enable k=1；
4., according to accident analysis principle of stacking, power distribution network is resolved into two networks of normal operation and fault component, i.e.,
The positive and negative order components of each node voltage can be calculatedThe active reactive power P of each voltage-type IIDGgi(k-1)With
Qgi(k-1)；
5., by the positive and negative order components of built-in potential of m platform voltage-type IIDGSubstitute into failure just
Negative-sequence Net calculates the positive and negative order components of short circuit current stable state of -1 Δ t of IIDG kth And corresponding have
Function power positive-negative sequence power steady-state component P1 gi(k-1)s、P2 gi(k-1)s, reactive power positive-negative sequence steady-state component Q1 gi(k-1)s、
Q2 gi(k-1)s；
6., utilize formula (5) calculate k-th of Δ t short circuit current positive-negative sequence steady-state component of voltage-type IIDGAnd corresponding active power positive-negative sequence steady-state component P1 gi(k)、P2 gi(k), reactive power positive-negative sequence stable state point
Measure Q1 gi(k)、Q2 gi(k)；
7., by operating normally when, dPgi(0)=0, dQgi(0)=0, the voltage-type IIDG active power for calculating k-th of Δ t is inclined
Poor dPgi(k)With reactive power dQgi(k)；The voltage-type IIDG potential phase angle and amplitude of k-th of Δ t are acquired by formula (8), i.e., it is electric
Die mould IIDG positive-negative sequence net equivalence potential
8., enable k=k+1；
If 9., the number of iterations k≤N, return step is 4.；Otherwise accident analysis terminates, and exports the short of each voltage-type IIDG
The positive and negative order components of road electric current
Compared with prior art, the present invention has the advantage that a kind of calculating IIDG containing voltage-type proposed by the present invention matches
The symmetrical component method of grid short circuit electric current considers the reciprocation of IIDG power control and network equation, and uses alternative manner
Realize built-in potential control and the decoupling computation of network equation, the phase component method that when short circuit calculation uses can effectively reduce phase component
The complexity and solution scale of method；The voltage-type IIDG short circuit calculation order components analytic modell analytical model of foundation, is conducive to IIDG controlling party
The combination of formula and distribution network failure analysis method, and the calculating of IIDG short circuit current order components can be used for distribution protection and its
Control under power distribution network unbalanced fault.
Detailed description of the invention
Fig. 1 is the equivalent circuit diagram that node i accesses voltage-type IIDG.
Fig. 2 is the Thevenin's equivalence circuit of voltage-type IIDG access node i.
Fig. 3 is voltage-type IIDG short circuit current changing rule schematic diagram.
Fig. 4 is the flow chart suitable for the power distribution network short circuit calculation symmetrical component method of IIDG containing voltage-type.
Specific embodiment
To be more clear the purposes, technical schemes and advantages of the embodiment of the present invention, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.
Core of the invention is to provide a kind of short circuit calculation symmetrical component method suitable for the power distribution network of IIDG containing voltage-type, should
Method can be realized the analytical Calculation of voltage-type IIDG short circuit current.Carrying out short circuit calculation using phase component method can effectively reduce
The complexity of phase components method and solve scale, and the calculating of IIDG short circuit current order components can be used for distribution protection and its
Control under power distribution network unbalanced fault.Therefore, the order components analytic modell analytical model for establishing voltage-type IIDG short circuit calculation, is more advantageous to
The combination of IIDG control mode and distribution network failure analysis method, the accurate short circuit current for calculating voltage-type IIDG.
It is when power distribution network different location accesses more voltage-type IIDG, its is equivalent at voltage source access power grid, obtain attached drawing 1
Shown in the power distribution network equivalent circuit of IIDG containing voltage-type, IIDG three-phase mean power and positive-negative sequence when thus deriving unbalanced fault
Net power relation, and attached equivalent circuit shown in Fig. 2 is obtained according to Thevenin's equivalence, and then establish voltage-type IIDG short circuit calculation
Order components model；In conjunction with the reciprocation of IIDG and the positive and negative sequence network of power distribution network, the fault current variation of voltage-type IIDG is derived
Rule；Finally, proposing the symmetrical components iterative algorithm of the power distribution network short circuit current of calculating IIDG containing voltage-type.Specific implementation step
It is as follows:
S1: when analysis power distribution network unbalanced fault, voltage-type IIDG three-phase mean power and positive-negative sequence net power relation, tool
Steps are as follows for body:
Voltage-type IIDG three-phase instantaneous power is by its end voltage vector ug=[uga,ugb,ugc] and current phasor ig=[iga,
igb,igc] determine, three phases active power pg=ug·ig, three phase reactive power qg=| ug×ig|；When power distribution network unbalanced fault
When, the end voltage-type IIDG voltage ugWith electric current igIt include positive and negative order components, i.e. ug=ug 1+ug 2, ig=ig 1+ig 2, wherein ug 1、
ug 2For the positive and negative order components of the end voltage-type IIDG voltage, ig 1、ig 2For the positive and negative order components of voltage-type IIDG electric current.Three-phase is active
Power is the half-period average value of instantaneous active power are as follows:
Positive-negative sequence voltage and current apposition ug 1×ig 1And ug 2×ig 2Reversely, the average value of three phase reactive power can be obtained:
θ in formula (2)u 1、θu 2For the positive and negative order components phase angle of the end voltage-type IIDG voltage, θi 1、θi 2Electricity is exported for voltage-type IIDG
Flow positive and negative order components phase angle.
S2: meter and voltage-type IIDG short circuit calculation order components model are established, the specific steps are as follows:
Assuming that containing n node in 1 power distribution network of attached drawing, and there is m platform voltage-type IIDG to access power distribution network, node 1 is major network etc.
It is worth power supply point, node 2 to (m+1) is IIDG access point.Node i thevenin equivalent circuit is as shown in Fig. 2, medium value potential
For node i open-circuit voltageEquivalent internal impedance is the self-impedance Z of node iii, node i open-circuit voltage are as follows:
In formula (3),WithThe respectively promise of power supply point equal currents and jth platform IIDG Injection Current.Just
It is often incorporated into the power networks IIDG when operation using power limitation control, its output power can be obtained by attached drawing 2 are as follows:
In formula (4), Pgi、QgiWithThe active power, idle of access i-node voltage-type IIDG when respectively operating normally
Power and built-in potential, Zgi=Zti+ZfiFor IIDG equivalence internal impedance, Zti、ZfiRespectively IIDG Transformer Short Circuit Impedance and filtering
Impedance, ZiiFor the self-impedance of node i,For node i open-circuit voltage.M platform IIDG can be calculated in stable state according to formula (3) and (4)
The generator terminal electric current and built-in potential phasor of operating point.
S3: in conjunction with the reciprocation of voltage-type IIDG and the positive and negative sequence network of power distribution network, the failure electricity of voltage-type IIDG is obtained
Rheology law and recurrence formula:
For the calculation of short-circuit current of the power distribution network of IIDG containing voltage-type, need to consider the adjusting of IIDG built-in potential and network equation
Reciprocation, and realize using alternative manner the decoupling computation of IIDG built-in potential and network equation in failure process, it is specific to walk
It is rapid as follows:
When the power distribution network short circuit calculation of IIDG containing voltage-type, byCalculate voltage-type IIDG short circuit in the 1st Δ t
Current sequence components initial value；The steady-state component of IIDG short circuit current in k-th of Δ t can be obtained by attached drawing 2 are as follows:
The instantaneous value of formula (5) short circuit currents steady-state component is igi(k)s(t)=Igi(k)scos(ωt+θis), -1 Δ of kth
Voltage-type IIDG short circuit current is set as i in tgi(k-1)(t)=Igi(k-1)cos(ωt+θi), andIIDG when iteration secondary for kth
Built-in potential,For node i open-circuit voltage steady-state value, θis、θiRespectively IIDG steady-state shortcircuit current and temporary short circuit electric current phase
Angle, Zgi=Zti+ZfiFor IIDG equivalence internal impedance, Zti、ZfiRespectively IIDG Transformer Short Circuit Impedance and filtering impedance, ZiiFor section
The self-impedance of point i.If short trouble, IIDG short circuit current in k-th of Δ t occur for power distribution network when t=0 are as follows:
In formula (6), τgi=(Lii+Lgi)/(Rii+Rgi), Lii、RiiAnd Lgi、RgiRespectively ZiiAnd ZgiInductance, resistance.
IIDG short circuit current virtual value in k-th of Δ t can be obtained by formula (6) are as follows:
It can be seen that the voltage-type IIDG short circuit current of access i-node approximate temporally constant, τ in each Δ tgiExponentially
Attenuation change.Attached drawing 3 is voltage-type IIDG short circuit current changing rule.The constant i.e. τ of network structure during distribution network failuregi
It is constant, but the initial current and short circuit current steady-state component in each Δ t are different.At this point, due in iteration step length in IIDG
Potential remains unchanged, thus also the approximate exponential law that presents changes the active and reactive power that IIDG is exported in each Δ t.
If power outer ring PI transmission function is GPI P(s)=kp P+ki P/ s and GPI Q(s)=kp Q+ki Q/ s, and -1 step-length of kth
The phase angle and amplitude of IIDG potential are δ(k-1)And Em(k-1).Power deviation dPgAnd dQgBuilt-in potential is updated after PI, according to PI power
Outer ring can obtain the phase angle and amplitude recurrence formula of i-th voltage-type IIDG built-in potential are as follows:
In formula (8), Δ t is iteration step length, kp P、ki P、kp Q、ki QFor the parameter of power outer ring PI transmission function, δi(k-1)With
Emi(k-1)It is dP for the phase angle and amplitude of -1 step size voltage type IIDG potential of kthgi(k)、dQgi(k)、dPgi(k-1)And dQgi(k-1)
The respectively power deviation of kth and k-1 step-length.Three-phase voltage signal is generated according to IIDG built-in potential phase angle and amplitude, includes
Potential componentWithDue to voltage-type IIDG use pair
Claim control, three-phase voltage is only comprising positive-sequence componentWith
The IIDG short circuit current virtual value I of k-th of end Δ t can be calculated when taking t=Δ t in formula (7)gi(k)(Δt).It is such as attached
Shown in Fig. 3, as the initial current of+1 iteration step length of kth, the control strategy of voltage-type IIDG is recycled to update in it
Potential, and then combine the steady-state current I of network equation calculating+1 step-length of kthgi(k+1)s.Accordingly using IIDG fault current in Δ
Exponential damping law in t can calculate the IIDG fault current of subsequent time.
S4: it proposes to calculate the symmetrical components iterative algorithm of the power distribution network short circuit current of the IIDG containing voltage-type, calculates and contain voltage
The short circuit current of the power distribution network of type IIDG:
When iterative calculation, IIDG built-in potential is remained unchanged in iteration step length, and IIDG fault current exponentially attenuation law,
Its active and reactive power exported is also approximate to be presented exponential law variation.Calculate the short circuit electricity of the power distribution network of the IIDG containing voltage-type
Stream, the specific steps are as follows:
1) original distribution nodal impedance matrix Z is formedo 1And Zo 2, by voltage-type IIDG set value of the power, simultaneous formula (3)
(4), built-in potential before calculating voltage-type IIDG failureFailure front voltageAnd PRE-FAULT CURRENT
2) Z is utilizedo 1、Zo 2Calculate voltage-type IIDG positive-negative sequence damping time constant τgi 1And τgi 2；
3) k=1 is enabled；
4) according to accident analysis principle of stacking, power distribution network is resolved into two networks of normal operation and fault component, is tied
Calculating and accident analysis in the swim, calculate each node voltage positive-sequence componentThe positive and negative order components of voltageEach voltage-type
The active-power P of IIDGgi(k-1)And reactive power Qgi(k-1)；
5) by the positive and negative order components of potential of m platform voltage-type IIDGWithIt is positive and negative to substitute into failure
The positive and negative order components of short circuit current stable state of sequence net calculating -1 Δ t of IIDG kthAnd corresponding wattful power
Rate positive-negative sequence steady-state component P1 gi(k-1)s、P2 gi(k-1)s, reactive power positive-negative sequence steady-state component Q1 gi(k-1)s、Q2 gi(k-1)s；
6) k-th of Δ t short circuit current positive-negative sequence steady-state component of voltage-type IIDG is calculated using formula (7) With
And corresponding active power positive-negative sequence steady-state component P1 gi(k)、P2 gi(k), reactive power positive-negative sequence steady-state component Q1 gi(k)、Q2 gi(k)；
7) when by operating normally, dPgi(0)=0, dQgi(0)=0, the voltage-type IIDG active power for calculating k-th of Δ t is inclined
Poor dPgi(k)With reactive power dQgi(k)；The voltage-type IIDG potential phase angle and amplitude of k-th of Δ t are acquired by formula (8), i.e., it is electric
Die mould IIDG positive-negative sequence net equivalence potential
8) k=k+1 is enabled；
If 9) the number of iterations k≤N (10 cycles, N=20 after failure), then return step S4d；Otherwise accident analysis knot
Beam exports the positive and negative order components of short circuit current of each voltage-type IIDG
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (4)
1. a kind of short circuit calculation symmetrical component method suitable for the type IIDG power distribution network of control containing voltage, it is characterised in that:
A, when analyzing power distribution network unbalanced fault first, voltage-type IIDG three-phase mean power and positive-negative sequence net power relation；
B, the short circuit calculation order components model that meter and voltage-type IIDG are symmetrically controlled is established；
C, in conjunction with the reciprocation of voltage-type IIDG and the positive and negative sequence network of power distribution network, the fault current variation of voltage-type IIDG is obtained
Rule and recurrence formula；
D, the symmetrical components iterative algorithm for proposing the power distribution network short circuit current of calculating IIDG containing voltage-type, calculates IIDG containing voltage-type
Power distribution network short circuit current.
2. being suitable for the short circuit calculation symmetrical component method of the type of control containing voltage IIDG power distribution network, feature as described in claim 1
It is, when analyzing power distribution network unbalanced fault in the step A, voltage-type IIDG three-phase mean power and positive-negative sequence net power are closed
System, the specific steps are as follows:
Voltage-type IIDG three-phase instantaneous power is by its end voltage vector ug=[uga,ugb,ugc] and current phasor ig=[iga,igb,
igc] determine, three phases active power pg=ug·ig, three phase reactive power qg=| ug×ig|；When power distribution network unbalanced fault, electricity
The end die mould IIDG voltage ugWith electric current igIt include positive and negative order components, i.e. ug=ug 1+ug 2, ig=ig 1+ig 2, three phases active power is
The half-period average value of instantaneous active power:
Positive-negative sequence voltage and current apposition ug 1×ig 1And ug 2×ig 2Reversely, the average value of three phase reactive power can be obtained:
θ in formulau 1、θu 2For the positive and negative order components phase angle of the end voltage-type IIDG voltage, θi 1、θi 2It is positive and negative that electric current is exported for voltage-type IIDG
Order components phase angle.
3. being suitable for the short circuit calculation symmetrical component method of the type of control containing voltage IIDG power distribution network, feature as described in claim 1
It is, the reciprocation of the step C combination voltage-type IIDG and the positive and negative sequence network of power distribution network obtain the failure of voltage-type IIDG
Curent change rule, the specific steps are as follows:
When the power distribution network short circuit calculation of IIDG containing voltage-type, byCalculate voltage-type IIDG short circuit electricity in the 1st Δ t
Flow order components initial value, then in k-th of Δ t IIDG short circuit current steady-state component are as follows:
The instantaneous value of formula short circuit currents steady-state component is igi(k)s(t)=Igi(k)scos(ωt+θis), voltage in -1 Δ t of kth
Type IIDG short circuit current is set as igi(k-1)(t)=Igi(k-1)cos(ωt+θi), andIIDG built-in potential when iteration secondary for kth,For node i open-circuit voltage steady-state value, θis、θiRespectively IIDG steady-state shortcircuit current and temporary short circuit current phase angle；
If when t=0, short trouble occurs for power distribution network, then voltage-type IIDG short circuit current in k-th of Δ t are as follows:
In formula, τgi=(Lii+Lgi)/(Rii+Rgi), Lii、RiiRespectively ZiiInductance and resistance, Lgi、RgiRespectively ZgiInductance
And resistance；
Voltage-type IIDG short circuit current virtual value in k-th of Δ t can be obtained by formula (4) are as follows:
If power outer ring PI transmission function is GPI P(s)=kp P+ki P/ s and GPI Q(s)=kp Q+ki Q/ s, and -1 step size voltage of kth
The phase angle and amplitude of type IIDG potential are δ(k-1)And Em(k-1)；Power deviation dPgAnd dQgBuilt-in potential is updated after PI, according to PI function
Rate outer ring can obtain the phase angle and amplitude recurrence formula of i-th voltage-type IIDG built-in potential are as follows:
In formula, kp P、ki P、kp Q、ki QFor the parameter of power outer ring PI transmission function.
4. the power distribution network short circuit calculation symmetrical component method of IIDG containing voltage-type as described in claim 1, which is characterized in that the step
Rapid D proposes the symmetrical components iterative algorithm of the power distribution network short circuit current of calculating IIDG containing voltage-type, calculates the IIDG's containing voltage-type
The short circuit current of power distribution network, the specific steps are as follows:
1., form original distribution nodal impedance matrix Zo 1And Zo 2, by voltage-type IIDG set value of the power, calculate voltage-type IIDG event
Built-in potential before hinderingFailure front voltageAnd PRE-FAULT CURRENT
2., utilize Zo 1、Zo 2Calculate voltage-type IIDG positive-negative sequence damping time constant τgi 1And τgi 2；
3., enable k=1；
4., according to accident analysis principle of stacking, power distribution network is resolved into two networks of normal operation and fault component, Ji Keji
Calculate the positive and negative order components of each node voltageThe active reactive power P of each voltage-type IIDGgi(k-1)And Qgi(k-1)；
5., by the positive and negative order components of built-in potential of m platform voltage-type IIDGSubstitute into failure positive-negative sequence
Net calculates the positive and negative order components of short circuit current stable state of -1 Δ t of IIDG kth And corresponding wattful power
Rate positive-negative sequence power steady-state component P1 gi(k-1)s、P2 gi(k-1)s, reactive power positive-negative sequence steady-state component Q1 gi(k-1)s、Q2 gi(k-1)s；
6., utilize formula (5) calculate k-th of Δ t short circuit current positive-negative sequence steady-state component of voltage-type IIDGAnd
Corresponding active power positive-negative sequence steady-state component P1 gi(k)、P2 gi(k), reactive power positive-negative sequence steady-state component Q1 gi(k)、Q2 gi(k)；
7., by operating normally when, dPgi(0)=0, dQgi(0)=0, calculate the voltage-type IIDG active power deviation of k-th of Δ t
dPgi(k)With reactive power dQgi(k)；The voltage-type IIDG potential phase angle and amplitude of k-th of Δ t, i.e. voltage are acquired by formula (8)
Type IIDG positive-negative sequence net equivalence potential
8., enable k=k+1；
If 9., the number of iterations k≤N, return step is 4.；Otherwise accident analysis terminates, and exports the short circuit electricity of each voltage-type IIDG
Flow positive and negative order components
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