CN108173249B - A kind of distribution network failure zone location algorithm considering inverse distributed power access - Google Patents
A kind of distribution network failure zone location algorithm considering inverse distributed power access Download PDFInfo
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Abstract
The invention discloses a kind of distribution network failure zone location algorithms of consideration inverse distributed power access, include the following steps: that (1) establishes inverse distributed power Faults Characteristic Analysis model under power limitation control mode；(2) multidomain treat-ment is carried out to power distribution network according to the characteristic distributions of the switching devices such as interconnection switch, breaker in power distribution network and establishes the graph model of power distribution network using the theoretical analysis method of graph theory, and set the current reference direction of power distribution network；(3) fault message uploaded using protective device at the power distribution network current reference direction of setting and breaker, is sought fault judgment matrix by matrix operation, realizes the positioning of fault zone.The present invention can satisfy distributed generation resource access, adjusts without action value, has the adaptive ability of certain topological structure.
Description
Technical field
The present invention relates to distribution protection technical field, especially a kind of distribution for considering inverse distributed power access
Net fault zone location algorithm.
Background technique
The concept of distributed generation resource results from the 1980s, referring to the appearance introduced in a power distribution system close to user side
Measure little power supply.With the maturation of the small power generations technology such as solar energy, wind energy, meet small user using the resource of dispersion
Demand.
The distributed generation resource in China develops overall state and keeps up with.But by resources supplIes, policy criteria and technology
The limitation of type difference etc., the fields such as photovoltaic power generation, cogeneration of heat and power development still in initial stage, scale is smaller.China
Small power station installation scale and generated energy rank first in the world.Wind-power electricity generation increases by 50 times in the installed capacity of past 7 years, but due to me
State's wind-powered electricity generation industry development excessive velocities, professional standard and Electric Power Network Planning relatively lag behind, and blower does not have the technologies such as low voltage crossing
Ability causes blower that cannot normally generate electricity by way of merging two or more grid systems；In west area, the ground such as such as Yinchuan of Ningxia Province has also been built many based on solar energy
The Demonstration Base of photovoltaic power generation, but the distribution of China electrity market can not fit like a glove with solar energy distribution.As with
The biggish eastern region of electricity, land price costly, if building the large-scale ground power station of centralization, will undoubtedly greatly improve
Cost is unfavorable for the large-scale promotion of solar power generation；And contain West Region Development centralization abundant power station in solar energy,
It will appear the loss problem of electric power long-distance transport again.Therefore, the following country is while further carrying out development of small scale hydropower station, it will
The development of emphasis propulsion photovoltaic power generation and cogeneration of heat and power distributed power technology.
Distributed generation technology has many benefits, and still, the protection of conventional electrical distribution net is the radiation characteristic according to power distribution network,
Principle of selectivity is followed, the isolation of fault zone is realized by the cooperation of protection equipment, to reach the smallest power loss range, is guaranteed
Power supply reliability.After distributed generation resource access, the unidirectional characteristics of tidal flow of power distribution network becomes bi-directional current characteristic, traditional protection adjusting
The premise of cooperation has been not present, and how to remain to accomplish that the correct cooperation of protection is that distributed power generation is protected after distributed generation resource access
The goal in research of shield.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of power distribution network of consideration inverse distributed power access
Fault zone location algorithm can satisfy distributed generation resource access, adjust without action value, it is adaptive have certain topological structure
Ability.
In order to solve the above technical problems, the present invention provides a kind of distribution network failure of consideration inverse distributed power access
Zone location algorithm, includes the following steps:
(1) inverse distributed power Faults Characteristic Analysis model under power limitation control mode is established；According to point of foundation
Cloth power failure specificity analysis model is analyzed the fault characteristic of distributed generation resource under fault condition and its is protected to power distribution network electric current
The influence of shield；
(2) power distribution network is carried out at subregion according to the characteristic distributions of the switching devices such as interconnection switch, breaker in power distribution network
Reason, using the theoretical analysis method of graph theory, establishes the graph model of power distribution network, and set the current reference direction of power distribution network；
(3) fault message uploaded using protective device at the power distribution network current reference direction of setting and breaker, is led to
It crosses matrix operation and seeks fault judgment matrix, realize the positioning of fault zone.
Preferably, step (1) specifically:
(11) inverse distributed power model is simplified；It is permanent to regard DC side voltage of converter approximation as holding
Fixed, the current failure characteristic of inverse distributed power depends primarily on the control strategy of inverter；
(12) Faults Characteristic Analysis is carried out to inverse distributed power under power limitation control mode；Inverter output power
Formula under dq coordinate system are as follows:
Wherein, P, Q are the active power and reactive power of IIDG output；ugd、ugqFor d, q axis component of network voltage；id、
iqFor d, q axis component of inverter output current；
When d axis is oriented to network voltage vector, have:
Wherein, ugFor network voltage vector magnitude；
By above-mentioned two formulas simultaneous solution, inverter PQ control reference current is obtained are as follows:
Wherein, Pref、QrefFor the active power reference value and reactive power reference qref of IIDG；id.ref、iq.refNormally to transport
Watt current reference value and reactive current reference value when row；
When power distribution network breaks down, grid voltage sags occur at points of common connection, inverse distributed power needs mention
For reactive current to guarantee grid stability；Idle reference current iq.ref.fIt is determined by the low voltage crossing characteristic taken；Consider
Inverter power element conveyance capacity to distributed generation resource is limited, if maximum output current imaxFor rated current inα (1.2
≤ α≤1.5) times, i.e. imax=α in, then have:
Wherein, id.ref.f、iq.ref.fWatt current reference value and reactive current reference value when for failure；
(13) after distributed generation resource access power distribution network, when short trouble occurs, system and inverse distributed power are same
When to fault point inject short circuit current, help increasing to act on due to distributed generation resource, at protective device current value increase, have malfunction can
Can, and distributed generation resource capacity is bigger, protective device malfunction possibility is higher；Meanwhile fault point upstream is distributed on faulty line
The short circuit current that formula power supply provides can raise grid entry point voltage, and the electric current for causing system to flow into faulty line becomes smaller；Due to dividing
The shunting function of cloth power supply, current value reduces at protective device, sensitivity decrease, have tripping may, and distributed generation resource holds
Amount is bigger, and protective device tripping possibility is higher.
Preferably, step (2) specifically:
(21) in distribution web area, using the route between each breaker as protection subregion, i.e., in protection subregion
It no longer include breaker, the connecting path that breaker is protected between unit as two, to power distribution network is divided into several
Protect subregion；
(22) the current reference direction of breaker is flowed through in setting；The electric current side of breaker is flowed through between adjacent protection subregion
To can arbitrarily set, above-mentioned current reference direction is described by the way of incidence matrix, incidence matrix element cijIt can make
Such as give a definition:
Wherein, positional relationship of the i row element of incidence matrix between region i and each breaker；Similarly, incidence matrix
Positional relationship of the i column element between breaker i and each protection zone.
Preferably, step (3) specifically:
(31) fault direction measuring cell is the key element in protection, is constituted using power-frequency voltage failure of the current component
Directional element, effect are the directions for judging failure；There is the possibility that bi-directional current occurs on the distribution network line of DG access, according to
Defined voltage, electric current positive direction, in the positive direction short circuit of protection, protection installation place voltage, current relationship are
In formula,To protect installation place power frequency fault component voltage, electric current；ZSFor on protection installation place bus etc.
Imitate the impedance of power supply；
In the opposite direction short circuit of protection, protection installation place voltage, current relationship are
In formula, Z'SFor for line impedance and to the sum of the effect source impedance such as on side bus；
Directional element is to compare fault component voltage and fault component the electric current Z in simulated impedancerPhase relation, if ZS、
Z'SAnd ZrImpedance angle it is equal, so fault current direction is positive, i.e., when positive direction failure
The influence for considering various factors, the criterion that fault current direction is positive when positive direction failure are
When reverse direction failure, power direction is negative, i.e.,
The influence for considering various factors, the criterion that fault current direction is negative when positive direction failure are
(32) formation of fault message matrix；If electric current is positive direction at breaker, then when event before power distribution network breaks down
When current direction is constant after barrier and amplitude increases, fault zone is one of breaker downstream area；Current direction is not after failure
When change and amplitude reduce or direction changes, fault zone is one of breaker upstream region；Before if power distribution network breaks down, open circuit
Electric current is negative direction at device, then when current direction is constant after failure and amplitude increases, fault zone is breaker upstream region
One of；When current direction is constant after failure and amplitude reduces or direction changes, fault zone is one of breaker downstream area；
The direction of current failure component is differentiated, representing fault current direction is provided by each breaker protective device
Logical value, formed fault message matrix DFAre as follows:
DF=[DF·1DF·2...DF·j]T
Wherein, j is breaker number, fault message matrix DFMiddle element is defined as follows:
(33) positioning of fault zone；When phase fault occurs, fault point voltage declines to a great extent, non-faulting region
Fault current will be injected to fault zone in the form of similar current source；
Failure definition current direction variable EjAre as follows:
Ej=cijDF·j
Wherein i is zone number, and j is breaker number.
EjFault current direction at breaker j is represented, if Ej=1, then fault current flows to region i by breaker j；If Ej
=-1, then fault current flows to breaker j by region i；
DefinitionFor the circuit breaker failure current direction variable that is connected with region i and, then the faulty section of protection scheme
Domain criterion are as follows:
The breaker number for prestoring each area periphery at breaker in protective device, determines failure according to Protection criteria
After the i of region, from protective device to the breaker sending action signal on the region boundary i, the isolation of fault zone is completed.
The invention has the benefit that (1) present invention is by interconnection switch and breaker in distribution network topology
Position realize the multidomain treat-ment to power distribution network, reduce the network matrix order of centerized fusion, accelerate the fortune of algorithm
Speed is calculated, the execution efficiency of protective device is improved；(2) present invention evades without adjusting to circuit breaker current action value
Influence of the distributed generation resource Injection Current for protection technique reduces distributed generation resource and accesses lower distribution protection device and miss
A possibility that dynamic, tripping, improve the safety and reliability under the conditions of distribution network failure；(3) present invention utilizes R-matrix
It realizes the network description and the setting in current reference direction for power distribution network topological structure, has certain distribution net topology knot
Structure adaptive ability reduces influence of the power distribution network topological structure change for protection technique, reliability with higher.
Detailed description of the invention
Fig. 1 is method flow schematic diagram of the invention.
Fig. 2 is the grid-connected equivalent schematic of inverse distributed power of the present invention.
Fig. 3 is the power distribution network topological structure schematic diagram that the present invention considers distributed generation resource access.
Fig. 4 is the power distribution network graph model schematic diagram that the present invention considers distributed generation resource access.
Specific embodiment
As shown in Figure 1, a kind of distribution network failure zone location algorithm for considering inverse distributed power access, including such as
Lower step:
(1) inverse distributed power Faults Characteristic Analysis model under power limitation control mode is established；According to point of foundation
Cloth power failure specificity analysis model is analyzed the fault characteristic of distributed generation resource under fault condition and its is protected to power distribution network electric current
The influence of shield；
(2) power distribution network is carried out at subregion according to the characteristic distributions of the switching devices such as interconnection switch, breaker in power distribution network
Reason, using the theoretical analysis method of graph theory, establishes the graph model of power distribution network, and set the current reference direction of power distribution network；
(3) fault message uploaded using protective device at the power distribution network current reference direction of setting and breaker, is led to
It crosses matrix operation and seeks fault judgment matrix, realize the positioning of fault zone.
Technical solution of the present invention is described in detail below:
Step 1: establishing inverse distributed power Faults Characteristic Analysis model under power limitation control mode, analyze failure item
The fault characteristic of distributed generation resource and its influence to power distribution network current protection under part.
(1) inverse distributed power model is simplified.The grid-connected equivalent schematic of inverse distributed power such as Fig. 2
It is shown.The factor being affected due to inverter direct-flow side parallel connection energy storage device and illumination and wind speed etc. to distributed generation resource
It, can be by DC side voltage of converter U it is believed that remaining unchanged during fault transientdcApproximation, which is regarded as, to be kept constant.Therefore inversion
The current failure characteristic of type distributed generation resource depends primarily on the control strategy of inverter.
(2) Faults Characteristic Analysis is carried out to inverse distributed power under power limitation control mode.Inverter output power
Formula under dq coordinate system are as follows:
Wherein, P, Q are the active power and reactive power of IIDG output；ugd、ugqFor d, q axis component of network voltage；id、
iqFor d, q axis component of inverter output current；
When d axis is oriented to network voltage vector, have:
Wherein, ugFor network voltage vector magnitude；
By above-mentioned two formulas simultaneous solution, inverter PQ control reference current is obtained are as follows:
Wherein, Pref、QrefFor the active power reference value and reactive power reference qref of IIDG；id.ref、iq.refNormally to transport
Watt current reference value and reactive current reference value when row；
When power distribution network breaks down, grid voltage sags occur at points of common connection, inverse distributed power needs mention
For reactive current to guarantee grid stability.Idle reference current iq.ref.fIt is determined by the low voltage crossing characteristic taken.Consider
Inverter power element conveyance capacity to distributed generation resource is limited, generally sets maximum output current imaxFor rated current inα
(1.2≤α≤1.5) times, i.e. imax=α in.Then have:
Wherein, id.ref.f、iq.ref.fWatt current reference value and reactive current reference value when for failure.
In conclusion PQ type IIDG can be equivalent to and network voltage U at PCCPCCRelated voltage-controlled current source.General feelings
Under condition, the short circuit current that IIDG is provided when failure occurs can be greater than the maximum current that its conveyance capacity allows, inverter outlet
Amplitude limit link controls inverter output current for imax。
(3) after distributed generation resource access power distribution network, when short trouble occurs, system and inverse distributed power are simultaneously
Short circuit current is injected to fault point, helps increasing to act on due to distributed generation resource, current value increases at protective device, has malfunction can
Can, and distributed generation resource capacity is bigger, protective device malfunction possibility is higher；Meanwhile fault point upstream is distributed on faulty line
The short circuit current that formula power supply provides can raise grid entry point voltage, and the electric current for causing system to flow into faulty line becomes smaller.Due to dividing
The shunting function of cloth power supply, current value reduces at protective device, sensitivity decrease, have tripping may, and distributed generation resource holds
Amount is bigger, and protective device tripping possibility is higher.
Step 2: subregion being carried out to power distribution network according to the characteristic distributions of the switching devices such as interconnection switch, breaker in power distribution network
Processing, using the theoretical analysis method of graph theory, establishes the graph model of power distribution network, and set the current reference direction of power distribution network, main
Want implementation steps as described below:
(1) in view of the arithmetic speed of server in centralized control is limited, the operation for carrying out Ultra-High Order matrix number is
It is unpractical, therefore multidomain treat-ment is carried out by bound pair power distribution network of open type interconnection switch, herein only to containing fault message
It is analyzed in region.In distribution web area, using the route between each breaker as protection subregion, i.e., in protection subregion
It no longer include breaker, the connecting path that breaker is protected between unit as two, to power distribution network is divided into several
Protect subregion.It include 6 breakers and 3 PQ control type IIDG for the power distribution network topology diagram shown in Fig. 3, in figure
Arrow indicates the load connected at bus.Power distribution network topological structure shown in Fig. 3 can be converted to Fig. 4 institute using above-mentioned partition method
Show power distribution network graph model, wherein A1~A7It is 7 protection unit areas, B1~B6It is 6 breakers.
(2) the current reference direction of breaker is flowed through in setting.The electric current side of breaker is flowed through between adjacent protection subregion
To can arbitrarily set, above-mentioned current reference direction is described by the way of incidence matrix, incidence matrix element cijIt can make
Such as give a definition:
Wherein, positional relationship of the i row element of incidence matrix between region i and each breaker.Similarly, incidence matrix
Positional relationship of the i column element between breaker i and each protection zone.
It defines accordingly, for the power distribution network graph model shown in Fig. 4, on the basis of zone number, obtaining current direction is by small volume
Number big numbering area of field flow orientation is positive direction (breaker B in such as Fig. 43, when electric current is by region A2Flow to region A4When, electric current is
Just), following incidence matrix can be formed:
Step 3: the fault message uploaded using protective device at the power distribution network current reference direction of setting and breaker,
Fault judgment matrix is sought by matrix operation, realizes the positioning of fault zone, it is described that the specific implementation steps are as follows:
(1) fault direction measuring cell is the key element in protection, is constituted using power-frequency voltage failure of the current component
Directional element, effect are the directions for judging failure.There is the possibility that bi-directional current occurs on the distribution network line of DG access, according to
Defined voltage, electric current positive direction, in the positive direction short circuit of protection, protection installation place voltage, current relationship are
In formula,To protect installation place power frequency fault component voltage, electric current；ZSFor on protection installation place bus etc.
Imitate the impedance of power supply.
In the opposite direction short circuit of protection, protection installation place voltage, current relationship are
In formula, Z'SFor for line impedance and to the sum of the effect source impedance such as on side bus.
As it can be seen that comparing the phase relation of the voltage of fault component, electric current, the direction of failure can be clearly determined.In order to
It is easy to implement the judgement of voltage, current phase relationship, actual directional element is to compare fault component voltage and fault component
Electric current exists
Z in simulated impedancerPhase relation, if ZS、Z'SAnd ZrImpedance angle it is equal, so when positive direction failure, failure
Current direction is positive, i.e.,
The influence for considering various factors, the criterion that fault current direction is positive when positive direction failure are
When reverse direction failure, power direction is negative, i.e.,
The influence for considering various factors, the criterion that fault current direction is negative when positive direction failure are
(2) formation of fault message matrix.If before power distribution network breaks down, electric current is positive direction (i.e. electric current at breaker
Downstream area is flowed to by upstream region), then when current direction is constant after failure and amplitude increases, fault zone is under breaker
Swim one of region；When current direction is constant after failure and amplitude reduces or direction changes, fault zone is breaker upstream
One of domain；If before power distribution network breaks down, electric current is negative direction (i.e. electric current flows to upstream region by downstream area) at breaker,
When then current direction is constant after failure and amplitude increases, fault zone is one of breaker upstream region；Electric current after failure
When direction is constant and amplitude reduction or direction change, fault zone is one of breaker downstream area.
Differentiated according to direction of the above method to current failure component, representative is provided by each breaker protective device
The logical value in fault current direction forms fault message matrix DFAre as follows:
DF=[DF·1 DF·2 ... DF·j]T
Wherein, j is breaker number, fault message matrix DF(i.e. protective device is according to electric current width at breaker for middle element
The logical value that value and phase information provide) it can be defined as follows:
In the power distribution network graph model shown in Fig. 4 for 2 failure of region, definition can form fault message matrix accordingly are as follows:
DF=[- 11111 1]T
(3) positioning of fault zone.When phase fault occurs, fault point voltage declines to a great extent, non-faulting region
Fault current will be injected to fault zone in the form of similar current source.
Failure definition current direction variable EjAre as follows:
Ej=cijDF·j
Wherein i is zone number, and j is breaker number.
EjRepresent fault current direction at breaker j.If Ej=1, then fault current flows to region i by breaker j；If Ej
=-1, then fault current flows to breaker j by region i.
DefinitionFor the circuit breaker failure current direction variable that is connected with region i and, then the faulty section of protection scheme
Domain criterion are as follows:
The breaker number of each area periphery is prestored at breaker in protective device.Failure is determined according to Protection criteria
After the i of region, from protective device to the breaker sending action signal on the region boundary i, the isolation of fault zone is completed.
Equally shown in Fig. 4 in power distribution network graph model for 2 failure of region, by R-matrix and fault message matrix multiple
Obtained fault location matrix are as follows:
[-1 4 0 -1 0 -1 -1]T
By fault zone criterion it is found that failure is located in region 2.As a result the reasonability of the program is demonstrated.
Claims (2)
1. a kind of distribution network failure zone location algorithm for considering inverse distributed power access, which is characterized in that including such as
Lower step:
(1) inverse distributed power Faults Characteristic Analysis model under power limitation control mode is established；According to the distribution of foundation
Power failure specificity analysis model analyzes the fault characteristic of distributed generation resource under fault condition；Specifically:
(11) inverse distributed power model is simplified；DC side voltage of converter approximation is regarded as and is kept constant, it is inverse
The current failure characteristic of modification distributed generation resource depends primarily on the control strategy of inverter；
(12) Faults Characteristic Analysis is carried out to inverse distributed power under power limitation control mode；Inverter output power is in dq
Formula under coordinate system are as follows:
Wherein, P, Q are the active power and reactive power of IIDG output；ugd、ugqFor d, q axis component of network voltage；id、iqFor
D, q axis component of inverter output current；
When d axis is oriented to network voltage vector, have:
Wherein, ugFor network voltage vector magnitude；
By above-mentioned two formulas simultaneous solution, inverter PQ control reference current is obtained are as follows:
Wherein, Pref、QrefFor the active power reference value and reactive power reference qref of IIDG；id.ref、iq.refWhen to operate normally
Watt current reference value and reactive current reference value；
When power distribution network breaks down, grid voltage sags occur at points of common connection, inverse distributed power needs to provide nothing
Function electric current is to guarantee grid stability；Idle reference current iq.ref.fIt is determined by the low voltage crossing characteristic taken；In view of dividing
The inverter power element conveyance capacity of cloth power supply is limited, if maximum output current imaxFor rated current inα (1.2≤α
≤ 1.5) again, i.e. imax=α in, then have:
Wherein, id.ref.f、iq.ref.fWatt current reference value and reactive current reference value when for failure；
(13) after distributed generation resource access power distribution network, when short trouble occurs, system and inverse distributed power at the same to
Short circuit current is injected in fault point, helps increasing to act on due to distributed generation resource, and current value increases at protective device, there is malfunction possibility,
And distributed generation resource capacity is bigger, protective device malfunction possibility is higher；Meanwhile fault point upstream distributed electrical on faulty line
The short circuit current that source provides can raise grid entry point voltage, and the electric current for causing system to flow into faulty line becomes smaller；Due to distribution
The shunting function of power supply, current value reduces at protective device, sensitivity decrease, have tripping may, and distributed generation resource capacity is got over
Greatly, protective device tripping possibility is higher；
(2) power distribution network progress multidomain treat-ment is used according to the characteristic distributions of interconnection switch, killer switch device in power distribution network
The theoretical analysis method of graph theory, establishes the graph model of power distribution network, and sets the current reference direction of power distribution network；
(3) fault message uploaded using protective device at the power distribution network current reference direction of setting and breaker, passes through square
Fault judgment matrix is sought in battle array operation, realizes the positioning of fault zone；Specifically:
(31) fault direction measuring cell is the key element in protection, constitutes direction using power-frequency voltage failure of the current component
Element, effect are the directions for judging failure；There is the possibility that bi-directional current occurs on the distribution network line of DG access, according to the rules
Voltage, electric current positive direction, in the positive direction short circuit of protection, protection installation place voltage, current relationship are
In formula,To protect installation place power frequency fault component voltage, electric current；ZSFor equivalent electricity on protection installation place bus
The impedance in source；
In the opposite direction short circuit of protection, protection installation place voltage, current relationship are
In formula, Z'SFor for line impedance and to the sum of the effect source impedance such as on side bus；
Directional element is to compare fault component voltage and fault component the electric current Z in simulated impedancerPhase relation, if ZS、Z'S
And ZrImpedance angle it is equal, so fault current direction is positive, i.e., when positive direction failure
The influence for considering various factors, the criterion that fault current direction is positive when positive direction failure are
When reverse direction failure, power direction is negative, i.e.,
The influence for considering various factors, the criterion that fault current direction is negative when positive direction failure are
(32) formation of fault message matrix；If before power distribution network breaks down, electric current is positive direction at breaker, then after failure
When current direction is constant and amplitude increases, fault zone is one of breaker downstream area；After failure current direction it is constant and
When amplitude reduces or direction changes, fault zone is one of breaker upstream region；Before if power distribution network breaks down, at breaker
Electric current is negative direction, then when current direction is constant after failure and amplitude increases, fault zone is one of breaker upstream region；
When current direction is constant after failure and amplitude reduces or direction changes, fault zone is one of breaker downstream area；
The direction of current failure component is differentiated, patrolling for representing fault current direction is provided by each breaker protective device
Value is collected, fault message matrix D is formedFAre as follows:
DF=[DF·1DF·2...DF·j]T
Wherein, j is breaker number, fault message matrix DFMiddle element is defined as follows:
(33) positioning of fault zone；When phase fault occurs, fault point voltage declines to a great extent, and non-faulting region will be with
The form of similar current source injects fault current to fault zone；
Failure definition current direction variable EjAre as follows:
Ej=cijDF·j
Wherein i is zone number, and j is breaker number；
EjFault current direction at breaker j is represented, if Ej=1, then fault current flows to region i by breaker j；If Ej=-1,
Then fault current flows to breaker j by region i；
DefinitionFor the circuit breaker failure current direction variable that is connected with region i and, then the fault zone criterion of protection scheme
Are as follows:
The breaker number for prestoring each area periphery at breaker in protective device, determines fault zone according to Protection criteria
After i, from protective device to the breaker sending action signal on the region boundary i, the isolation of fault zone is completed.
2. the distribution network failure zone location algorithm of inverse distributed power access is considered as described in claim 1, it is special
Sign is, step (2) specifically:
(21) in distribution web area, using the route between each breaker as protection subregion, i.e., in protection subregion no longer
Include breaker, the connecting path that breaker is protected between unit as two, so that power distribution network is divided into several protections
Subregion；
(22) the current reference direction of breaker is flowed through in setting；The current direction that breaker is flowed through between adjacent protection subregion can
Any setting, describes above-mentioned current reference direction by the way of incidence matrix, incidence matrix element cijIt can make as follows
Definition:
Wherein, positional relationship of the i row element of incidence matrix between region i and each breaker；Similarly, the i column of incidence matrix
Positional relationship of the element between breaker i and each protection zone.
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| CN113030643B (en) * | 2021-03-09 | 2023-01-31 | 国网山东省电力公司聊城供电公司 | Fault analysis method and system for distribution network voltage source type distributed power supply |
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