CN109687537A - A kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control method of no communication - Google Patents
A kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control method of no communication Download PDFInfo
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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
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Abstract
The present invention relates to a kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control methods of no communication, comprising: step S1: establishing the sagging Controlling model of each controllable type distributed generation resource；Step S2: the sagging Controlling model of combination of all controllable type distributed generation resources of the sub- microgrid of AC and DC is established；Step S3: determining the virtual spare capacity and virtual peak power output of the sub- microgrid of AC and DC, and obtains the sagging Controlling model of segmentation of the sub- microgrid of AC and DC；Step S4: the sagging Controlling model of segmentation that the design sub- microgrid of AC and DC is controlled containing second compensation；Step S5: being normalized a-c cycle and DC voltage, and determines the exchange power between the sub- microgrid of AC and DC to be controlled.Compared with prior art, the present invention can realize the indifference operation of system under conditions of no communication, improve the power quality of system, while save resource needed for system communications line is arranged.
Description
Technical field
The present invention relates to one kind, more particularly, to a kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control side of no communication
Method.
Background technique
Alternating current-direct current mixing micro-capacitance sensor is wind-powered electricity generation, photovoltaic distributed power supply (distributed generator, DG) is a large amount of
It is by alternating current and direct current power supply and load point that access power distribution network, which provides a kind of more efficient solution alternating current-direct current mixing micro-capacitance sensor,
Not Gou Cheng the sub- microgrid of alternating current and direct current, pass through the intermediate two-way interconnection converter (interlinkingconverter, IC) of AC/DC
Interconnection is constituted.Meanwhile ac bus realizes mixing micro-capacitance sensor by static switch (static transfer switch, STS)
With the grid-connected switching with isolated operation of power distribution network.Optimization operation in AC and DC subnet and the interactive cooperation between subnet are to friendship
The safe and stable operation of direct current mixing micro-capacitance sensor is most important.
DC bus-bar voltage and exchange side frequency are that the endogenous lotus power-balance of reflection mixing micro-capacitance sensor and system are stable
Key index.Related document proposes a kind of autonomous coordinated control plan based on sagging control for tri- port system of AC/DC/DS
Slightly, realize that each sub- microgrid autonomy is run by sagging control, with the a-c cycle and DC voltage letter Jing Guo normalized
Number realize subnet between autonomous coordinated control.Although entire control system is without communication, sagging control can be to the frequency of system
Carry out steady-state deviation with voltage band, influences power quality.Related document proposes a kind of muti-layer control tactics, including the sagging control of bottom
System realizes the primary distribution of power；Middle layer realizes the secondary recovery control of voltage, frequency；Top layer completes power optimization distribution
Control.But mentioned control strategy is directed to AC and DC micro-capacitance sensor respectively, does not account for the interconnection supporting role of power between the two；
Simultaneously in communication failure, hierarchical control can not acquire and provide signal, bring greater impact to the optimal control of system.Have
Document is closed with the minimum target of the flow of power for interconnecting converter, establishes interaction transimission power and DC voltage and a-c cycle
Relationship realizes distributing rationally for whole system power.But this control strategy only has in the case where only one sub- microgrid overloads
There is preferable control effect.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of friendship of no communication is straight
Stream mixing micro-capacitance sensor indifference optimal control method.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control method of no communication, comprising:
Step S1: the sagging Controlling model of each controllable type distributed generation resource is established；
Step S2: the sagging Controlling model of combination of all controllable type distributed generation resources of the sub- microgrid of AC and DC is established；
Step S3: the virtual spare capacity and virtual peak power output of the sub- microgrid of AC and DC are determined, and is obtained cross, straight
Flow the sagging Controlling model of segmentation of sub- microgrid；
Step S4: the sagging Controlling model of segmentation that the design sub- microgrid of AC and DC is controlled containing second compensation；
Step S5: being normalized a-c cycle and DC voltage, and determines the exchange between the sub- microgrid of AC and DC
Power is to be controlled.
The step S3 includes:
Step S31: the virtual spare capacity and virtual peak power output of the sub- microgrid of AC and DC are determined；
Step S32: the sagging Controlling model of segmentation of the sub- microgrid of AC and DC is obtained.
The step S31 specifically: according to the size of the sub- microgrid controllable type distributed generation resource capacity of AC and DC, set respectively
Meter exchanges the virtual peak power output P ' of sub- microgrid accordinglya max, virtual spare capacity: Δ PacAnd the sub- microgrid of direct current is virtually most
Big output power P 'd max, virtual spare capacity Δ Pdc。
The virtual spare capacity specifically:
ΔPac=Pa max-P′a max
Wherein: PamaxFor the practical peak power output for exchanging sub- microgrid,
The virtual spare capacity specifically:
ΔPdc=Pd max-P′d max
Wherein: PdmaxFor the practical peak power output of the sub- microgrid of direct current.
The step S32 specifically: sagging control segmentation is designed at the virtual peak power output of the sub- microgrid of AC and DC
Point obtains the sagging Controlling model of segmentation of system.
The step S4 specifically: based on the obtained sagging Controlling model of segmentation, exchange is introduced in the Ith section of sagging control
The control of the second compensation of frequency and DC voltage, determines the sagging control mould of segmentation that the sub- microgrid of AC and DC is controlled containing second compensation
Type difference is as follows:
M1=(fmin-fmax)/P′a max
M2=(fmin-f*)/(Pa max-P′a max)
Wherein, f is AC system frequency, fmin、fmaxRespectively minimum, the maximum value of exchange subnet frequency permission, f* table
Show the rated frequency for exchanging sub- microgrid, PacIt indicates to exchange the wattful power that sub- microgrid controllable type distributed generation resource integrally externally exports
Rate；DC voltage second compensation controls signal:kpV、kiVFor second compensation control
Parameter, VdcIndicate DC side busbar voltage,Respectively minimum, the maximum value of direct current subnet voltage permission,Table
Show the specified busbar voltage of the sub- microgrid of direct current, PdcIndicate the function that controllable type distributed generation resource integrally externally exports in the sub- microgrid of direct current
Rate.
In the step S5, the normalization formula of a-c cycle and DC voltage it is following or:
Wherein: ζ be normalized before value, (ζ) ' indicate ζ normalized after value, value range be [- 1,
0], ζ*、ζminRespectively indicate the rated value and minimum value of ζ.
Compared with prior art, the invention has the following advantages:
1) the indifference operation that system can be realized under conditions of no communication, improves the power quality of system, same to time
Resource needed for system communications line is arranged is saved.
2) the autonomous operating principle with micro- internetwork coordination in microgrid is proposed for alternating current-direct current mixing micro-capacitance sensor, advantageously reduce
Power Exchange loss between sub- microgrid, improves system effectiveness.
3) be micro-capacitance sensor, the control of microgrid group and alternating current-direct current mixing micro-capacitance sensor provides new thinking and theory, favorably
In the large-scale development and utilization that promote distribution type renewable energy.
Detailed description of the invention
Fig. 1 is the key step flow diagram of the method for the present invention；
The topology diagram of Fig. 2 isolated island alternating current-direct current mixing micro-capacitance sensor；
Fig. 3 micro-capacitance sensor tradition droop characteristic；
The function frequency static characteristic curve of Fig. 4 conventional electric power system；
Fig. 5 exchanges sub- microgrid and is segmented droop characteristic；
The sub- microgrid of Fig. 6 direct current is segmented droop characteristic；
The sub- microgrid of exchange of the Fig. 7 containing second compensation is segmented sagging control；
The sub- microgrid of direct current of the Fig. 8 containing second compensation is segmented sagging control；
The control strategy of Fig. 9 interconnection converter；
Figure 10 alternating current-direct current mixing micro-capacitance sensor simulation model；
Figure 11 operating condition a period of time DC bus-bar voltage waveform diagram；
Figure 12 operating condition a period of time a-c cycle waveform diagram；
DC bus-bar voltage waveform diagram when Figure 13 operating condition two；
A-c cycle waveform diagram when Figure 14 operating condition two；
The power flowed out when Figure 15 operating condition two from the sub- microgrid of direct current；
DC bus-bar voltage waveform when Figure 16 operating condition three；
A-c cycle waveform when Figure 17 operating condition three；
The power waveform flowed out when Figure 18 operating condition three from the sub- microgrid of direct current.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
A kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control method of no communication, as shown in Figure 1, comprising:
Step S1: the sagging Controlling model of each controllable type distributed generation resource is established；
Step S2: the sagging Controlling model of combination of all controllable type distributed generation resources of the sub- microgrid of AC and DC is established；
Step S3: the virtual spare capacity and virtual peak power output of the sub- microgrid of AC and DC are determined, and is obtained cross, straight
The sagging Controlling model of segmentation of sub- microgrid is flowed, step S3 includes:
Step S31: the virtual spare capacity and virtual peak power output of the sub- microgrid of AC and DC are determined；
Step S31 specifically: according to the size of the sub- microgrid controllable type distributed generation resource capacity of AC and DC, separately design phase
The virtual peak power output P ' of the sub- microgrid of the exchange answereda max, virtual spare capacity: Δ PacAnd the sub- microgrid of direct current is virtual maximum defeated
Out power P 'd max, virtual spare capacity Δ Pdc。
Virtual spare capacity specifically:
ΔPac=Pa max-P′a max
Wherein: PamaxFor the practical peak power output for exchanging sub- microgrid,
Virtual spare capacity specifically:
ΔPdc=Pd max-P′d max
Wherein: PdmaxFor the practical peak power output of the sub- microgrid of direct current.
Step S32: obtaining the sagging Controlling model of segmentation of the sub- microgrid of AC and DC, specifically: in the sub- microgrid of AC and DC
The sagging control waypoint of design, obtains the sagging Controlling model of segmentation of system at virtual peak power output.
Step S4: the sagging Controlling model of segmentation that the design sub- microgrid of AC and DC is controlled containing second compensation, specifically: it is based on
The sagging Controlling model of obtained segmentation introduces the second compensation control of a-c cycle and DC voltage in the Ith section of sagging control,
The sagging Controlling model difference of segmentation for determining that the sub- microgrid of AC and DC is controlled containing second compensation is as follows:
M1=(fmin-fmax)/P′a max
M2=(fmin-f*)/(Pa max-P′a max)
Wherein, f is AC system frequency, fmin、fmaxRespectively minimum, the maximum value of exchange subnet frequency permission, f*Table
Show the rated frequency for exchanging sub- microgrid, PacIt indicates to exchange the wattful power that sub- microgrid controllable type distributed generation resource integrally externally exports
Rate；DC voltage second compensation controls signal:kpV、kiVFor second compensation control
Parameter, VdcIndicate DC side busbar voltage,Respectively minimum, the maximum value of direct current subnet voltage permission,Table
Show the specified busbar voltage of the sub- microgrid of direct current, PdcIndicate the function that controllable type distributed generation resource integrally externally exports in the sub- microgrid of direct current
Rate.
Step S5: being normalized a-c cycle and DC voltage, and determines the exchange between the sub- microgrid of AC and DC
Power is to be controlled, wherein the normalization formula of a-c cycle and DC voltage it is following or:
Wherein: ζ be normalized before value, (ζ) ' indicate ζ normalized after value, value range be [- 1,
0], ζ*、ζminRespectively indicate the rated value and minimum value of ζ.
(1) the sagging control principle of tradition
Fig. 2 is the topology diagram of isolated island alternating current-direct current mixing micro-capacitance sensor, to realize each controllable type distributed generation resource
Output power is distributed by its rated power between (controllable distributed generator, CDG), sagging control
Widely applied to alternating current and direct current micro-capacitance sensor.Wherein, the P-v expression formula of the sub- microgrid of P-f, direct current of sub- microgrid is exchanged
It is as follows:
In formula, Pac_x、Pdc_yThe output power of respectively x-th exchange controllable source and y-th of direct current controllable source；f,Vdc_y
The respectively terminal voltage of AC system frequency and y-th of direct current controllable source；mx、dyRespectively x-th exchange controllable source and y
The sagging coefficient of a direct current controllable source；fmin、fmaxWithRespectively minimum, the maximum value of exchange subnet frequency permission
Minimum, the maximum value allowed with direct current subnet voltage；Respectively x-th exchange controllable source and y-th of direct current can
The peak power output in control source.
Consider that each distributed generation resource line impedance difference is unfavorable to DC source active power distribution bring in direct current subnet
It influences, with the following sagging control strategy of improvement DC voltage:
In formula, idc_y、Zdc_yThe output electric current and outlet line resistance of respectively y-th direct current controllable source.
Using the droop characteristic of each controllable type distributed generation resource, all controllable type distributed electricals of the sub- microgrid of AC and DC are established
The sagging Controlling model of the combination in source is as follows:
In formula, M, D are respectively the sagging coefficient of combination for exchanging controllable type distributed generation resource in the sub- microgrid of sub- microgrid, direct current.
The combination droop characteristic of alternating current and direct current subnet is as shown in figure 3, wherein f*、Respectively indicate exchange sub- microgrid rated frequency and
The specified busbar voltage of the sub- microgrid of direct current.
(2) the sagging control of the segmentation with second compensation
Based on the function frequency static characteristic of generator in conventional electric power system, a kind of sagging control strategy of segmentation, simulation are proposed
Influence of the spare capacity to system active power regulation in conventional electric generators out.As shown in Figure 4, when generated output power is in area
Between [0, PGN) when, since generator is there are spare capacity, P-f is in a sagging relationship of line style；When generated output power reaches
It exports upper limit PGNWhen, generated output power is constant, no spare capacity, and load increases caused system frequency and declines with regard to phase
When serious.Therefore active power spare capacity has two following effects in conventional electric power system: 1) in given range
Load fluctuation provides active compensation；2) when in system load increase it is excessive, when causing active power spare insufficient, system frequency meeting
Quickly change with load fluctuation, and fast-changing frequency can become the insufficient instruction of system active power output and with reference to letter
Number.
The function frequency static characteristic of conventional electric power system is applied in controllable micro- source based on sagging control, proposes exchange
The concept of microgrid " virtual spare capacity ", the sagging control that can must exchange sub- microgrid have the characteristics that segmentation, characteristic curve such as Fig. 5
It is shown.Wherein P 'a maxFor " the virtual peak power output " for exchanging sub- microgrid, Pa maxPractical maximum for the sub- microgrid of exchange is defeated
Power out, Δ Pac=Pamax-P′a maxFor " the virtual spare capacity " for exchanging sub- microgrid.
In order to overcome the sagging control of tradition to adversely affect to systematic steady state performance bring, the application proposes defeated in sub- microgrid
Power is [0, P ' outa max] section when, with second compensation control realize system frequency non differential regulation；When output power exists
(P′a max,Pa max] section when, pass through interconnection converter realize AC and DC micro-capacitance sensor mutual support, mutual backup.Containing secondary
The sagging control of segmentation of the sub- microgrid of exchange of compensation control is illustrated in fig. 7 shown below.
Exchanging the sagging control of the segmentation in sub- microgrid containing second compensation can be indicated with following formula:
δ f=kpf(f*-f)+kif∫(f*-f)dt
In formula, M1=(fmin-fmax)/P′a max, M2=(fmin-f*)/(Pa max-P′a max)；Indicate exchange
The sub- microgrid active power that controllably micro- source integrally externally exports；δ f is that frequency second compensation controls signal；kpf、kifFor secondary benefit
Repay control parameter.
The function frequency characteristic of generator is generalized in the sub- microgrid of direct current, can obtain and exchanges similar sagging spy in sub- microgrid
Property.The segmentation of the control containing second compensation in the sub- microgrid of direct current is sagging as shown in Figure 8, wherein P 'd maxFor the sub- microgrid of direct current
" virtual peak power output ", PdmaxFor the practical peak power output of the sub- microgrid of direct current, Δ Pdc=Pd max-P′d maxFor direct current
" the virtual spare capacity " of sub- microgrid.
The sagging control of segmentation in the sub- microgrid of direct current containing second compensation can be represented by the formula:
In formula,Indicate the power that controllable micro- source integrally externally exports in the sub- microgrid of direct current；δVdcSignal is controlled for voltage second compensation；kpV、kiV
For second compensation control parameter.
(3) coordinated control between the sub- microgrid of alternating current-direct current
The sagging control strategy of segmentation based on the sub- microgrid of alternating current and direct current proposes to reach the virtual of sub- microgrid in output power
The mutual support of power is realized when peak power output by interconnection converter.The normalization formula of a-c cycle and DC voltage
It is as follows:
In formula, ζ is f or Vdc；(ζ) ' indicate that ζ normalized value, value range are [- 1,0]；ζ*、ζminTable respectively
Show the rated value and minimum value of ζ.
As the above analysis, output power is [0, P'max] section when (P 'maxFor P 'a maxOr P 'd max), sub- microgrid
The non differential regulation of realization system is controlled by the second compensation of each controllable type distributed generation resource, therefore (ζ) ' perseverance is 0；Work as output work
Rate is in (P'max,Pmax] section when (PmaxFor PamaxOr Pdmax), the droop characteristic of You Gezi microgrid can obtain (ζ) ' value range and be
[- 1,0), interconnection converter perceives sub- microgrid state change by acquisition local signal, and then realizes interconnection power transmission control.
In order to make full use of the characteristic of each sub- microgrid autonomy operation, while giving full play to mutual between the sub- microgrid of alternating current and direct current
The effect of dynamic support, the application propose the operating principle of alternating current-direct current mixing micro-capacitance sensor " autonomous interactive ", and analyze interconnection transformation
The basic demand of device Power Exchange:
1) when the output power of each sub- microgrid is all when within virtual peak power output, sub- microgrid passes through band second compensation
Sagging control realize system autonomous indifference operation.The wave in virtual peak power output should be met when output power simultaneously
When dynamic, the exchange power perseverance for interconnecting converter is 0.
2) when the output power of certain sub- microgrid be more than its virtual peak power output, and mix micro-capacitance sensor output total capacity do not have
When having the sum of the virtual peak power output beyond system, power interaction need to be carried out by interconnection converter, realize whole system
Indifference coordinated operation.
3) when the output power of system is more than the sum of the virtual peak power output of mixing micro-capacitance sensor, whole system operation
In the IIth section of sagging control stage, the mutual support of power is realized by interconnection converter.But this operating status can give system
Steady-state deviation is brought, should be paid attention to when power system capacity designs, and avoided.
It is positive assuming that the exchange power of interconnection converter is transferred to the sub- microgrid of exchange from the sub- microgrid of direct current, then exchanges power P
Expression formula are as follows:
Following Power Exchange management rule can be designed by the Power Exchange basic demand of interconnection converter,
A:| (ζτ) ' | > ζg
B:| P | > Pg
In formula, (ζτ) ' (ζ) after expression generation power swing after time τ ' value；ζgAnd PgFor close to 0 normal number,
Respectively characterize stable state when (ζ) ' normal fluctuation and interconnection converter power loss.
Then the expression formula of the exchange power P with transmission power management is as follows:
In formula, ∪, ∩ respectively indicate logic or logical AND.
(4) performance analysis
In order to verify the feasibility of the proposed control strategy of the application, built in MATLAB/SIMULINK emulation platform as
The simulation model of alternating current-direct current mixing micro-capacitance sensor shown in Fig. 10.
Simulating, verifying is carried out for the different operating conditions of alternating current-direct current mixing micro-capacitance sensor, mainly includes three operating conditions.Operating condition 1
When studying each sub- microgrid power swing occurring in its virtual peak power output, passes through second compensation control and realize sub- microgrid
Autonomous indifference operation.Performance is coordinated in interaction between operating condition 2 verifies sub- microgrid.Operating condition 3 verifies this plan by a series of switching of loads
Effect of optimization slightly in complex situations.It is compared before this emulation and improvement, wherein the parameter phase of the sub- microgrid of alternating current and direct current
Together, design parameter is as shown in table 1.
The simulation parameter of 1 system of table
Operating condition 1:
When fluctuating in its virtual peak power output to verify the output power of each sub- microgrid, each sub- microgrid can lead to
It crosses and autonomous indifference operation is realized to the second compensation control in controllable micro- source, devise following operating condition.
When system stable operation is to 1s, exchanges sub- microgrid load and increase to 3.3kW from 2.8kW suddenly；Direct current is micro- when 2s
The load of net increases to 2.78kW from 2.33kW；When operation is to 3s, exchanges sub- microgrid load and be reduced to 2.8kW from 3.3kW suddenly；4s
When exchange sub- microgrid and increase active demand 0.4kW, reactive power demand and increase to 1kVar, the sub- microgrid output work of direct current from 0kVar
Rate is down to 2.41kW.The busbar voltage of the sub- microgrid of direct current with exchange the electric voltage frequency waveform of sub- microgrid as is illustrated by figs. 11 and 12.
By simulation result comparative analysis it is found that 1) 1s with 3s when exchange the load fluctuation of sub- microgrid, lead to its frequency fluctuation,
But the mentioned control strategy of the application can fast implement the second compensation of frequency, reach system indifference operating status；Meanwhile it exchanging
The power swing of sub- microgrid does not have an impact DC voltage, illustrates do not have flow of power between the sub- microgrid of AC and DC at this time,
Each microgrid can be realized autonomous indifference operation.2) when 2s, this strategy can be realized autonomous nothing when the sub- microgrid sudden load change of direct current
Difference operation.3) when exchanging sub- microgrid reactive power demand fluctuation, this strategy can be realized the indifference control of its voltage.
To sum up, when the output power of each sub- microgrid fluctuates in its spare capacity, the mentioned control strategy of the application can
The autonomous indifference operation for realizing sub- microgrid, is conducive to the advantage for playing each sub- microgrid, while improving power quality.
Operating condition 2:
Strategy is mentioned when mixing micro electric network coordination operation to the power support of the sub- microgrid of AC and DC in order to verify the application
Effect designs following operating condition.
When 1s, sub- microgrid load is exchanged by 3kW and increases to 4.5kW；When 2.5s, exchanges sub- microgrid load power and be further added by
1kW；When 3.5s, the AC load of 1kW is cut off.The load perseverance of the sub- microgrid of direct current is 2.41kW.Simulation waveform such as Figure 13 to Figure 15
It is shown.
It is compared by Figure 13 to Figure 15 it is found that 1) when exchanging sub- microgrid in 2.5s, output power exceeds its virtual maximum output
When power, the sub- microgrid of direct current can carry out power support to it, coordinate the non differential regulation of realization system by interaction.2) when 1s,
It exchanges sub- microgrid load to increase suddenly, but output power passes through the second compensation of sub- microgrid in its virtual peak power output
The autonomous indifference operation of system may be implemented in control, but the prior art needs the Power Exchange between the sub- microgrid of AC and DC.Lead to simultaneously
Figure 15 is crossed it is found that the mentioned control strategy of the application can reduce the Power Exchange between the sub- microgrid of alternating current-direct current, advantageously reduces route
Power loss.
By the above simulation analysis it is found that the mentioned control strategy of the application had both had preferable interaction trade-off effect, while energy
The autonomous regulation performance for enough giving full play to each sub- microgrid, reduces mutual flow of power.
Operating condition 3:
Feasibility of this strategy when coping with complication system situation is verified by a series of power swings.Operating condition design are as follows:
Sub- microgrid load is exchanged when 1s and increases to 4kW from 3kW, and the load of the sub- microgrid of direct current keeps 2.41kW constant；DC load when 2s
Increase to 4.81kW；Sub- microgrid excision 1kW load is exchanged when 3s；DC load is down to 2.41kW when 4s.DC bus-bar voltage, friendship
Frequency and the power waveform flowed out from the sub- microgrid side of direct current are flowed respectively as shown in Figure 16 to Figure 18.
Thus the simulation result of operating condition can be seen that no matter mix in micro-capacitance sensor exchange sub- microgrid load how to fluctuate (such as:
When 1s and 3s) or output-power fluctuation (such as: the when 2s and 4s) system of the sub- microgrid of direct current can be transported by " autonomous interactive "
Row improves the power quality of system in indifference operating status.Simultaneously compared with the prior art, the mentioned control strategy of the application reduces
Exchange power between alternating current-direct current microgrid.
Claims (7)
1. a kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control method of no communication characterized by comprising
Step S1: the sagging Controlling model of each controllable type distributed generation resource is established；
Step S2: the sagging Controlling model of combination of all controllable type distributed generation resources of the sub- microgrid of AC and DC is established；
Step S3: determining the virtual spare capacity and virtual peak power output of the sub- microgrid of AC and DC, and obtains AC and DC
The sagging Controlling model of the segmentation of microgrid；
Step S4: the sagging Controlling model of segmentation that the design sub- microgrid of AC and DC is controlled containing second compensation；
Step S5: being normalized a-c cycle and DC voltage, and determines the exchange power between the sub- microgrid of AC and DC
To be controlled.
2. a kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control method of no communication according to claim 1, feature
It is, the step S3 includes:
Step S31: the virtual spare capacity and virtual peak power output of the sub- microgrid of AC and DC are determined；
Step S32: the sagging Controlling model of segmentation of the sub- microgrid of AC and DC is obtained.
3. a kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control method of no communication according to claim 2, feature
It is, the step S31 specifically: according to the size of the sub- microgrid controllable type distributed generation resource capacity of AC and DC, separately design phase
The virtual peak power output P ' of the sub- microgrid of the exchange answeredamax, virtual spare capacity: Δ PacAnd the sub- microgrid of direct current is virtual maximum defeated
Out power P 'dmax, virtual spare capacity Δ Pdc。
4. a kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control method of no communication according to claim 3, feature
It is, the virtual spare capacity specifically:
ΔPac=Pamax-P′amax
Wherein: PamaxFor the practical peak power output for exchanging sub- microgrid,
The virtual spare capacity specifically:
ΔPdc=Pdmax-P′dmax
Wherein: PdmaxFor the practical peak power output of the sub- microgrid of direct current.
5. a kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control method of no communication according to claim 2, feature
It is, the step S32 specifically: sagging control waypoint is designed at the virtual peak power output of the sub- microgrid of AC and DC,
Obtain the sagging Controlling model of segmentation of system.
6. a kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control method of no communication according to claim 5, feature
It is, the step S4 specifically: based on the obtained sagging Controlling model of segmentation, exchange frequency is introduced in the Ith section of sagging control
The control of the second compensation of rate and DC voltage, determines the sagging Controlling model of segmentation that the sub- microgrid of AC and DC is controlled containing second compensation
It is as follows respectively:
M1=(fmin-fmax)/P′amax
M2=(fmin-f*)/(Pamax-P′amax)
Wherein, f is AC system frequency, fmin、fmaxRespectively minimum, the maximum value of exchange subnet frequency permission, f* indicate to hand over
Flow the rated frequency of sub- microgrid, PacIt indicates to exchange the active power that sub- microgrid controllable type distributed generation resource integrally externally exports；Directly
Galvanic electricity presses second compensation to control signal:kpV、kiVFor second compensation control parameter,
VdcIndicate DC side busbar voltage,Respectively minimum, the maximum value of direct current subnet voltage permission,Indicate direct current
The specified busbar voltage of sub- microgrid, PdcIndicate the power that controllable type distributed generation resource integrally externally exports in the sub- microgrid of direct current.
7. a kind of alternating current-direct current mixing micro-capacitance sensor indifference optimal control method of no communication according to claim 6, feature
Be, in the step S5, the normalization formula of a-c cycle and DC voltage it is following or:
Wherein: ζ be normalized before value, (ζ) ' indicate ζ normalized after value, value range be [- 1,0], ζ *,
ζminRespectively indicate the rated value and minimum value of ζ.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110401196A (en) * | 2019-08-13 | 2019-11-01 | 湖南大学 | Alternating current-direct current mixing micro-capacitance sensor secondary control method based on the uniformly coordinated factor |
| CN111740426A (en) * | 2020-06-30 | 2020-10-02 | 上海电力大学 | Island alternating current-direct current hybrid micro-grid group power cooperative control method |
| CN112260330A (en) * | 2020-10-14 | 2021-01-22 | 西安热工研究院有限公司 | Virtual synchronous machine control method for hybrid micro-grid MMC interconnection converter |
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| CN105514966A (en) * | 2016-01-21 | 2016-04-20 | 上海电力学院 | Energy storage optimization and coordination control method for direct-current micro grid group |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110401196A (en) * | 2019-08-13 | 2019-11-01 | 湖南大学 | Alternating current-direct current mixing micro-capacitance sensor secondary control method based on the uniformly coordinated factor |
| CN110401196B (en) * | 2019-08-13 | 2022-11-29 | 湖南大学 | AC/DC hybrid micro-grid secondary control method based on unified coordination factor |
| CN111740426A (en) * | 2020-06-30 | 2020-10-02 | 上海电力大学 | Island alternating current-direct current hybrid micro-grid group power cooperative control method |
| CN111740426B (en) * | 2020-06-30 | 2023-09-26 | 上海电力大学 | Island AC/DC hybrid micro-grid group power cooperative control method |
| CN112260330A (en) * | 2020-10-14 | 2021-01-22 | 西安热工研究院有限公司 | Virtual synchronous machine control method for hybrid micro-grid MMC interconnection converter |
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