CN108832652A - Islanded system stability control method, device and equipment containing centralized photovoltaic - Google Patents
Islanded system stability control method, device and equipment containing centralized photovoltaic Download PDFInfo
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- CN108832652A CN108832652A CN201810522118.9A CN201810522118A CN108832652A CN 108832652 A CN108832652 A CN 108832652A CN 201810522118 A CN201810522118 A CN 201810522118A CN 108832652 A CN108832652 A CN 108832652A
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- 238000012502 risk assessment Methods 0.000 claims abstract description 43
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Classifications
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a kind of islanded system stability control methods containing centralized photovoltaic, including：According to the cut-off point acquisition of information target isolated island of grid nodes information and network topology and power grid containing centralized photovoltaic power station system；The target isolated island stability risk evaluation index value is obtained according to the generator parameter of the target isolated island and load parameter；Corresponding adjust is carried out according to the risk assessment index value to control；Wherein, the risk assessment index value is higher, then the security performance of the islanded system is lower, and the risk assessment index value is lower, then the security performance of the islanded system is higher；Wherein, it is corresponding to adjust control including cutting off the photovoltaic plant connection, adjusting active power and adjusting any one in reactive power, a kind of islanded system control device for stability containing centralized photovoltaic and a kind of islanded system stability control device of the raising containing centralized photovoltaic are additionally provided, the utilization rate of power supply reliability and generation of electricity by new energy is improved.
Description
Technical field
The present invention relates to safe operation of power system assessment technology field more particularly to a kind of isolated islands containing centralized photovoltaic
System stability control method, device and equipment.
Background technique
Photovoltaic parallel in system is made of photovoltaic array, inverter, alternating current circuit and four part of control circuit.Photovoltaic array is
It is made of in series and parallel a certain number of photovoltaic modulies, gird-connected inverter is by DC inverter caused by photovoltaic array at exchange
It is connected to the grid after electricity；DC/DC translation circuit between photovoltaic array and inverter by adjust the duty ratio of wholly-controled device S come
The output voltage of photovoltaic array is controlled, to realize MPPT.Alternating current circuit part primarily serves the effect of filtering, guarantees photovoltaic plant
The grid-connected voltage of output and the electric current of injection power grid have higher power quality.In grid connection state, photovoltaic DC-to-AC converter is usually adopted
It takes and determines PQ control model, i.e., vector majorization scheme voltage oriented based on grid side realizes net side active power and reactive power
Decoupling control, control target is that keep DC voltage be steady state value, while it is idle for setting value to control exchange.
Breaker actuation after grid collapses, photovoltaic plant very likely enters isolated operation, this into isolated island mode
Belong to unplanned isolated island.For centralized photovoltaic plant, since capacity is big, usually connection substation, interior outfit of standing are more complete
Microcomputer protecting device and isolated island discriminating gear, can guarantee to cut off photovoltaic plant when utility network failure.
When major network breaks down, breaker correctly acts excision failure, and photovoltaic plant enters isolated operation.If isolated island
Inside only contain a form of power supply of photovoltaic, for centralized photovoltaic plant, the microcomputer protection system and isolated island of substation are sentenced
Other device can control breaker and cut off photovoltaic plant from system.If also there are other other than photovoltaic plant in isolated island often
Power supply is advised, isolated island discriminating gear is difficult to differentiate island state at this time, and such case is in order to improve power supply reliability and new energy
The utilization rate of source power generation is also not necessarily required at once cut off photovoltaic plant from system, thus in the control to islanded system,
There is no reliable isolated island stability assessment decision-making foundation.
Summary of the invention
In view of the above-mentioned problems, the purpose of the present invention is to provide a kind of islanded system stability controls containing centralized photovoltaic
Method can judge the stability of islanded system, and provide stability risk evaluation index value, according to the stability
Risk assessment index value is controlled, and the utilization rate of power supply reliability and generation of electricity by new energy is improved.
In a first aspect, the present invention provides a kind of islanded system stability control methods containing centralized photovoltaic, including：
According to the cut-off point information of grid nodes information and network topology and power grid containing centralized photovoltaic power station system
Obtain target isolated island；
The target isolated island stability risk assessment is obtained according to the generator parameter of the target isolated island and load parameter
Index value；
Corresponding adjust is carried out according to the risk assessment index value to control；Wherein, the risk assessment index value is higher,
Then the security performance of islanded system is lower, and the risk assessment index value is lower, then the security performance of the islanded system is higher；
Wherein, corresponding adjusting control includes, cuts off the photovoltaic plant connection, adjusts active power and adjust in reactive power
Any one.
In the first possible implementation of first aspect, the generator parameter according to the target isolated island and negative
Lotus parameter obtains the target isolated island stability risk evaluation index value：
Institute is obtained according to the generator parameter of the target isolated island and load parameter and risk quantification evaluation index formula
State target isolated island stability risk evaluation index value；Wherein, the risk quantification evaluation index formula is：
Wherein, eAReflection be the endogenous lotus of isolated island active power difference and reactive power it is poor
It is worth the influence to islanded system stability risk；For generator perunit value；α is photovoltaic permeability.
The possible implementation of with reference to first aspect the first, in second of possible implementation of first aspect, institute
It statesWherein, SsFor the practical capacity provided of islanded system interior power；SLFor load capacity；Ps
For the practical active power provided of islanded system interior power；PLFor burden with power；QsFor the practical nothing provided of islanded system interior power
Function power；QLFor load or burden without work.
The possible implementation of with reference to first aspect the first, in the third possible implementation of first aspect, institute
It statesWherein,For generator perunit value；N is generator number in islanded system；SiFor i-th generator
Rated capacity；TJ,iFor the inertia time constant of i-th generator；Equal to 7s.
In the 4th kind of possible implementation of first aspect, power grid section of the basis containing centralized photovoltaic power station system
The cut-off point acquisition of information target isolated island of point information and network topology and power grid includes：
The capacity of normal power supplies is not much larger than light in the power grid containing centralized photovoltaic plant that the cut-off point is formed
The capacity of overhead utility, and the information transmission time difference apart from the farthest node of photovoltaic plant and nearest node cannot be excessive, then it is described
What cut-off point was formed is the target isolated island containing centralized photovoltaic plant power grid.
It is described to be carried out accordingly according to the risk assessment index value in the 5th kind of possible implementation of first aspect
Adjusting control includes：
When the risk assessment index value is greater than 1 less than 10, active power is adjusted or adjusts reactive power；
When the risk assessment index is greater than 10, the photovoltaic plant connection is cut off.
Second aspect, the present invention provides a kind of islanded system control device for stability containing centralized photovoltaic, including：
Target isolated island obtain module, for containing centralized photovoltaic power station system grid nodes information and network topology and
The cut-off point acquisition of information target isolated island of power grid；
Index value obtains module, for obtaining the target according to the generator parameter and load parameter of the target isolated island
Isolated island stability risk evaluation index value；
Control module is controlled for carrying out corresponding adjust according to the risk assessment index value；Wherein, the risk is commented
Estimate that index value is higher, then the security performance of the islanded system is lower, and the risk assessment index value is lower, then the isolated island system
The security performance of system is higher；Wherein, corresponding adjusting control includes cutting off the photovoltaic plant connection, adjusting active power
With adjusting reactive power.
The third aspect, the present invention provides a kind of islanded system stability control devices containing centralized photovoltaic, including place
It manages device, memory and storage in the memory and is configured as the computer program executed by the processor, it is described
Processor is realized when executing the computer program as described above containing the islanded system stability control method of centralized photovoltaic.
One technical solution of above-mentioned technical proposal has the following advantages that：According to the power grid containing centralized photovoltaic power station system
The cut-off point acquisition of information target isolated island of nodal information and network topology and power grid, and then contain concentration according to what cut-off point was formed
The capacity of normal power supplies in the power grid of formula photovoltaic plant, photovoltaic plant capacity, apart from the farthest node of the photovoltaic plant and away from
Information transmission time difference from the photovoltaic plant nearest node determines target isolated island, according to the generator of the target isolated island
Parameter and load parameter obtain the target isolated island stability risk evaluation index value, and the risk assessment index value is higher, then
The security performance of islanded system is lower, and the risk assessment index value is lower, then the security performance of the islanded system is higher, root
It carries out corresponding adjust according to the risk assessment index value to control, there are also other routines other than photovoltaic plant in islanded system
Power supply, the islanded system are then possible without unstability, but when entering new stable state, for centralized photovoltaic plant and a small amount of nearby
Normal power supplies are unplanned into isolated island, and islanded system stability risk comments when photovoltaic combining inverter is still within PQ control model
Estimate and provide theoretical foundation, can be judged according to actual isolated island situation, improves power supply reliability and generation of electricity by new energy
Utilization rate.
Detailed description of the invention
Fig. 1 is that the islanded system stability control method process containing centralized photovoltaic that first embodiment of the invention provides is shown
It is intended to；
Fig. 2 is a kind of islanded system control device for stability containing centralized photovoltaic that second embodiment of the invention provides
Structural schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of islanded system stability control methods containing centralized photovoltaic, individually below into
Row is described in detail.
Embodiment one
Referring to Fig. 1, the islanded system stability control method stream containing centralized photovoltaic of first embodiment of the invention offer
Journey schematic diagram；
It needs, in embodiments of the present invention, the islanded system is the islanded system containing centralized photovoltaic plant,
The islanded system stability control containing centralized photovoltaic is carried out for the power grid containing centralized photovoltaic plant.
S11, the basis grid nodes information and network topology and power grid containing centralized photovoltaic power station system are broken
Prescribe acquisition of information target isolated island
Preferably, grid nodes information and network topology and power grid of the basis containing centralized photovoltaic power station system
Cut-off point acquisition of information target isolated island includes：
The capacity of normal power supplies is not much larger than in the power grid containing centralized photovoltaic plant that the cut-off point is formed
The capacity of photovoltaic plant, and the information transmission time difference in power grid apart from the farthest node of photovoltaic plant and nearest node cannot mistake
Greatly, then the power grid containing centralized photovoltaic plant that the cut-off point is formed is the target isolated island.It should be noted that described
Cut-off point information only includes the nodal information of the breaker disconnected, in the islanded system stability control containing centralized photovoltaic
Equipment storage inside has the network topology and nodal information of maximum target isolated island, can be contained according to the cut-off point information judgement transmitted
Whether the side power grid of centralized photovoltaic plant forms the target isolated island whether within the scope of maximum isolated island, judge to need
The capacity of normal power supplies in the power grid containing centralized photovoltaic plant that the data wanted have cut-off point to be formed, photovoltaic plant capacity,
Information transmission time difference apart from the farthest node of the photovoltaic plant and apart from the photovoltaic plant nearest node, these data are
The islanded system stability control device containing centralized photovoltaic is according to cut-off point information, on oneself internal storage information basis
It is upper acquisition and calculating.
S12, the target isolated island stability risk is obtained according to the generator parameter and load parameter of the target isolated island
Evaluation index value；
In the present embodiment, the target isolated island stability risk evaluation index value is embodied when electric network fault causes to concentrate
Formula photovoltaic plant and nearby a small amount of normal power supplies it is unplanned into isolated island when, the active power difference and reactive power of the endogenous lotus of isolated island
The inertia time constant of synchronous generator is to stability characteristic (quality) in the islanded system short time in difference, photovoltaic permeability and isolated island
Influence.Wherein photovoltaic permeability refers to that photovoltaic power output accounts for the ratio of islanded system interior power gross capability.Emulation discovery power
Difference is bigger, photovoltaic permeability is higher, generator inertia more hour, and islanded system stability risk is higher.
Preferably, described to be stablized according to the generator parameter and load parameter of the target isolated island acquisition target isolated island
Property risk assessment index value includes：
Institute is obtained according to the generator parameter of the target isolated island and load parameter and risk quantification evaluation index formula
State target isolated island stability risk evaluation index value；Wherein, the risk quantification evaluation index formula is：
Wherein, eAReflection be the endogenous lotus of isolated island active power difference and reactive power it is poor
It is worth the influence to islanded system stability risk；For generator perunit value；α is photovoltaic permeability.
In the present embodiment, the IndexriskBigger, the islanded system stability risk containing centralized photovoltaic plant is got over
It is high.E in the risk quantification evaluation index formulaAWhat is reflected is the active power difference and reactive power difference of the endogenous lotus of isolated island
Influence to islanded system stability risk, A is bigger, the IndexriskBigger, islanded system stability risk is bigger.It is described
IndexriskDenominator reflection be photovoltaic permeability and synchronous generator inertia time constant to islanded system stability risk
Influence.((1- α)) item indicates when being equal to 1, i.e., in islanded system only containing photovoltaic plant a type of power supply when, it is described
IndexriskFor infinity, illustrate that system there are serious unstability risk, needs to cut off photovoltaic plant at once.It is then to isolated island
The inertia time constant of all synchronous generators seeks standardization again after weighted average according to capacity in system.
Preferably, describedWherein, SsFor the practical appearance provided of islanded system interior power
Amount；SLFor load capacity；PsFor the practical active power provided of islanded system interior power；PLFor burden with power；QsFor islanded system
The practical reactive power provided of interior power；QLFor load or burden without work.
In the present embodiment, it is on the one hand to prevent the Index using natural ExponentsriskMolecule be constantly equal to 0
It happens, it is difficult to influence of the parameter in denominator to quantizating index is embodied, on the other hand also in that the endogenous lotus of isolated island has
The influence of function power difference and reactive power difference to islanded system stability risk is more significant.
Preferably, describedWherein,For generator perunit value；N is generator number in islanded system
Mesh；SiFor the rated capacity of i-th generator；TJ,iFor the inertia time constant of i-th generator；Equal to 7s.
In the present embodiment, emulation discovery, the indexriskIt is unplanned to can be well reflected centralized photovoltaic plant
After into isolated island in the short time islanded system stability risk.Table 1 is the simulation result on PSCAD, and major network occurs single-phase when 3s
Failure, breaker disconnects forming isolated island after 0.1s.
It should be noted that work as A=0, and system can tend to rapidly stable when α is close to 0, therefore the indexrisk
System stability is best when less than or equal to 1, and islanded system frequency elevation amplitude is small.The indexriskWhen greater than 1 but less than 10,
System can reach new stable state, but isolated island frequency is eventually more than limit value, and the islanded system containing centralized photovoltaic is stablized at this time
Property control equipment can take certain control strategy to reduce islanded system stability risk.
| Operating condition | indexrisk | The isolated island unstability moment | Islanded system frequency/Hz when 6s |
| 1 | 1.0 | Non- unstability in 6s | 50.7 |
| 2 | 3.7 | Non- unstability in 6s | 51.7 |
| 3 | 5.2 | Non- unstability in 6s | 52.1 |
| 4 | 8.8 | Non- unstability in 6s | 53.0 |
| 5 | 13 | 5s | 85 |
| 6 | It is infinitely great | 3.1s | >100 |
Table 1
S13, corresponding adjusting control is carried out according to the risk assessment index value；Wherein, the risk assessment index value
Higher, then the security performance of islanded system is lower, and the risk assessment index value is lower, then the security performance of the islanded system
It is higher；Wherein, corresponding adjusting control includes cutting off the photovoltaic plant connection, adjusting active power and adjust idle function
Any one in rate.
Preferably, described to include according to the corresponding adjusting control of risk assessment index value progress：
When the risk assessment index value is greater than 1 less than 10, active power is adjusted or adjusts reactive power；
When the risk assessment index is greater than 10, the photovoltaic plant connection is cut off.
Wherein, described when the risk assessment index value is greater than 1 less than 10, active power is adjusted or adjusts idle
Power includes：
Obtain the preset lower limit value and preset upper limit value of the islanded system frequency；
Obtain the idle power output upper limit value of the generator；
When the system frequency of the islanded system surmounts the upper limit value, the active power output of the photovoltaic plant is reduced,
The automatic control system of auxiliary power system frequency carries out frequency retrieval；
In the islanded system reactive power, the idle power output of the insufficient and described generator reaches the idle power output upper limit
When value, the reactive power reference qref of photovoltaic DC-to-AC converter is adjusted, the photovoltaic plant is made to have certain reactive power support ability；
It is all satisfied burden requirement in the active and idle power output of the islanded system interior power, but has synchronous generator to be not up to
When specified active power output, a part of active power output is transferred to synchronization by the active power reference value by reducing photovoltaic DC-to-AC converter
Generator, to reduce photovoltaic permeability to reduce islanded system stability risk.It should be noted that：In the isolated island system
When the system frequency of system surmounts the lower limit value, low-frequency load shedding operation will do it by frequency automatic load-reducing device, containing centralization
The islanded system stability control device of photovoltaic is failure to actuate.
It should be noted that 1, when system frequency surmounts the upper limit value, first reduce photovoltaic plant active power output；
2, when System Reactive Power is insufficient and generator reaches the idle power output upper limit value, the reactive power reference of photovoltaic DC-to-AC converter is adjusted
Value, makes photovoltaic plant have certain reactive power support ability；3, when isolated island interior power is active and idle power output is all satisfied load and wants
When asking, but thering is synchronous generator to be not up to specified active power output, by reduce photovoltaic DC-to-AC converter active power reference value by
A part of active power output is transferred to synchronous generator, to reduce photovoltaic permeability to reduce islanded system stability risk.When
The indexriskWhen greater than 10, usual system meeting unstability should issue rapidly the signal of excision photovoltaic plant.
Implement the present embodiment to have the advantages that：
According to the cut-off point information of grid nodes information and network topology and power grid containing centralized photovoltaic power station system
Target isolated island is obtained, the appearance of the capacity of normal power supplies, photovoltaic plant in the power grid containing centralized photovoltaic formed according to cut-off point
Amount, the information transmission time difference apart from the farthest node of the photovoltaic plant and apart from the photovoltaic plant nearest node determine orphan
Island obtains the target isolated island stability risk evaluation index according to the generator parameter of the target isolated island and load parameter
Value, the risk assessment index value is higher, then the security performance of islanded system is lower, and the risk assessment index value is lower, then
The security performance of the islanded system is higher, carries out corresponding adjust according to the risk assessment index value and controls in islanded system
It is interior other than photovoltaic plant there are also other normal power supplies, which is then possible without unstability, but enters new stable state
When, unplanned into isolated island for centralized photovoltaic plant and neighbouring a small amount of normal power supplies, photovoltaic combining inverter is still within PQ control
The assessment of islanded system stability risk provides theoretical foundation when molding formula, and the index is succinctly intuitive, and data acquisition more holds
Easily, it can be judged according to actual isolated island situation, improve the utilization rate of power supply reliability and generation of electricity by new energy.
Embodiment two
Referring to fig. 2, second embodiment of the invention provides a kind of isolated island control device for stability, including：
Target isolated island obtains module 21, for being opened up according to grid nodes information and network containing centralized photovoltaic power station system
It flutters and the cut-off point acquisition of information target isolated island of power grid；
Index value obtains module 22, for obtaining the mesh according to the generator parameter and load parameter of the target isolated island
Mark isolated island stability risk evaluation index value；
Control module 23 is controlled for carrying out corresponding adjust according to the risk assessment index value；Wherein, the risk
Evaluation index value is higher, then the security performance of the islanded system is lower, and the risk assessment index value is lower, then the isolated island
The security performance of system is higher；Wherein, corresponding adjusting control includes cutting off the photovoltaic plant connection, adjusting wattful power
Rate and adjusting reactive power.
Preferably, the index value acquisition module 22 includes：Joined according to the generator parameter of the target isolated island and load
Several and risk quantification evaluation index formula obtains the target isolated island stability risk evaluation index value；Wherein, the risk
Quantitative evaluation Index Formula is：
Wherein, eAReflection be the endogenous lotus of isolated island active power difference and reactive power it is poor
It is worth the influence to islanded system stability risk；For generator perunit value；α is photovoltaic permeability.
Preferably, describedWherein, SsFor the practical appearance provided of islanded system interior power
Amount；SLFor load capacity；PsFor the practical active power provided of islanded system interior power；PLFor burden with power；QsFor islanded system
The practical reactive power provided of interior power；QLFor load or burden without work.
Preferably, describedWherein,For generator perunit value；N is generator number in islanded system
Mesh；SiFor the rated capacity of i-th generator；TJ,iFor the inertia time constant of i-th generator；Equal to 7s.
The target isolated island obtains module 21：It is conventional in the power grid containing centralized photovoltaic that the cut-off point is formed
The capacity of power supply is not much larger than the capacity of photovoltaic plant, and transmits apart from the information of the farthest node of photovoltaic plant and nearest node
Time difference cannot be excessive, then the power grid containing centralized photovoltaic that the cut-off point is formed is the target isolated island.
The control module 23 includes：
When the risk assessment index value is greater than 1 less than 10, active power is adjusted or adjusts reactive power；
When the risk assessment index is greater than 10, the photovoltaic plant connection is cut off.
Implement the present embodiment to have the advantages that：
According to the cut-off point acquisition of information of nodal information and network topology and power grid containing centralized photovoltaic power station system
Target isolated island, the capacity of normal power supplies in the power grid containing centralized photovoltaic formed according to cut-off point, photovoltaic plant capacity, away from
From the farthest node of the photovoltaic plant and with a distance from the information transmission time difference of the photovoltaic plant nearest node determine isolated island, root
The target isolated island stability risk evaluation index value is obtained according to the generator parameter and load parameter of the target isolated island, it is described
Risk assessment index value is higher, then the security performance of islanded system is lower, and the risk assessment index value is lower, then the isolated island
The security performance of system is higher, according to the risk assessment index value carry out it is corresponding adjust control, in islanded system in addition to
There are also other normal power supplies outside photovoltaic plant, which is then possible without unstability, but when the new stable state of entrance, for collection
Chinese style photovoltaic plant and neighbouring a small amount of normal power supplies are unplanned into isolated island, when photovoltaic combining inverter is still within PQ control model
The assessment of islanded system stability risk provides theoretical foundation, and the index is succinctly intuitive, and data acquisition is relatively easy to, Ke Yigen
Judged according to actual isolated island situation, improves the utilization rate of power supply reliability and generation of electricity by new energy.
It should be noted that the apparatus embodiments described above are merely exemplary, wherein described be used as separation unit
The unit of explanation may or may not be physically separated, and component shown as a unit can be or can also be with
It is not physical unit, it can it is in one place, or may be distributed over multiple network units.It can be according to actual
It needs that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.In addition, device provided by the invention
In embodiment attached drawing, the connection relationship between module indicate between them have communication connection, specifically can be implemented as one or
A plurality of communication bus or signal wire.Those of ordinary skill in the art are without creative efforts, it can understand
And implement.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
It should be noted that in the above-described embodiments, all emphasizing particularly on different fields to the description of each embodiment, in some embodiment
In the part that is not described in, reference can be made to the related descriptions of other embodiments.Secondly, those skilled in the art should also know
It knows, the embodiments described in the specification are all preferred embodiments, and related movement and simulation must be that the present invention must
Must.
Claims (8)
1. a kind of islanded system stability control method containing centralized photovoltaic, which is characterized in that including：
According to the cut-off point acquisition of information of grid nodes information and network topology and power grid containing centralized photovoltaic power station system
Target isolated island；
The target isolated island stability risk evaluation index is obtained according to the generator parameter of the target isolated island and load parameter
Value；
Corresponding adjust is carried out according to the risk assessment index value to control；Wherein, the risk assessment index value is higher, then institute
The security performance for stating islanded system is lower, and the risk assessment index value is lower, then the security performance of the islanded system is higher；
Wherein, corresponding adjusting control includes cutting off the photovoltaic plant connection, adjusting active power and adjust in reactive power
Any one.
2. the islanded system stability control method according to claim 1 containing centralized photovoltaic, which is characterized in that described
The target isolated island stability risk evaluation index value packet is obtained according to the generator parameter of the target isolated island and load parameter
It includes：
The mesh is obtained according to the generator parameter of the target isolated island and load parameter and risk quantification evaluation index formula
Mark isolated island stability risk evaluation index value；Wherein, the risk quantification evaluation index formula is：
Wherein, eAWhat is reflected is the active power difference and reactive power difference pair of the endogenous lotus of isolated island
The influence of islanded system stability risk；For generator perunit value；α is photovoltaic permeability.
3. the islanded system stability control method according to claim 2 containing centralized photovoltaic, which is characterized in that describedWherein, SsFor the practical capacity provided of islanded system interior power；SLFor load capacity；PsFor
The practical active power provided of islanded system interior power；PLFor burden with power；QsFor islanded system interior power it is practical provide it is idle
Power；QLFor load or burden without work.
4. the islanded system stability control method according to claim 2 containing centralized photovoltaic, which is characterized in that describedWherein,For generator perunit value；N is generator number in islanded system；SiFor i-th generator
Rated capacity；TJ,iFor the inertia time constant of i-th generator；Equal to 7s.
5. the islanded system stability control method according to claim 1 containing centralized photovoltaic, which is characterized in that described
According to the cut-off point acquisition of information target of grid nodes information and network topology and power grid containing centralized photovoltaic power station system
Isolated island includes：
The capacity of normal power supplies is not much larger than photovoltaic electric in the power grid containing centralized photovoltaic plant that the cut-off point is formed
The capacity stood, and the information transmission time difference apart from the farthest node of photovoltaic plant and nearest node cannot be excessive, then the disconnection
The power grid containing centralized photovoltaic plant that point is formed is the target isolated island.
6. the islanded system stability control method according to claim 1 containing centralized photovoltaic, which is characterized in that described
Carrying out corresponding adjusting control according to the risk assessment index value includes：
When the risk assessment index value is greater than 1 less than 10, active power is adjusted or adjusts reactive power；
When the risk assessment index is greater than 10, the photovoltaic plant connection is cut off.
7. a kind of islanded system control device for stability containing centralized photovoltaic, which is characterized in that including：
Target isolated island obtain module, for according to containing centralized photovoltaic power station system grid nodes information and network topology and
The cut-off point acquisition of information target isolated island of power grid；
Index value obtains module, for obtaining the target isolated island according to the generator parameter and load parameter of the target isolated island
Stability risk evaluation index value；
Control module is controlled for carrying out corresponding adjust according to the risk assessment index value；Wherein, the risk assessment refers to
Scale value is higher, then the security performance of the islanded system is lower, the risk assessment index value is lower, then the islanded system
Security performance is higher；Wherein, corresponding adjusting control include, cut off the photovoltaic plant connection, adjust active power and
Adjust reactive power.
8. a kind of islanded system stability control device containing centralized photovoltaic, including processor, memory and it is stored in institute
The computer program executed by the processor is stated in memory and is configured as, the processor executes the computer program
Shi Shixian is as claimed in any of claims 1 to 7 in one of claims containing the islanded system stability control method of centralized photovoltaic.
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Effective date of registration: 20210721 Address after: No. 11, Kexiang Road, Science City, Huangpu District, Guangzhou City, Guangdong Province Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Patentee after: CHINA SOUTHERN POWER GRID Co.,Ltd. Address before: No. 11, Kexiang Road, Science City, Huangpu District, Guangzhou City, Guangdong Province Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER Patentee before: China Southern Power Grid Research Institute Co.,Ltd. Patentee before: CHINA SOUTHERN POWER GRID Co.,Ltd. |