CN109842137A - A kind of control method for coordinating of list three-phase mixed connection microgrid group - Google Patents
A kind of control method for coordinating of list three-phase mixed connection microgrid group Download PDFInfo
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Abstract
A kind of control method for coordinating of list three-phase mixed connection microgrid group, including establishing the Isobarically Control mathematical model controlled based on ratio resonance；Using the double-closed-loop control scheme of outer voltage current inner loop；Acquisition three phase power information simultaneously carries out tri-phase unbalance factor judgement；Two-stage control coordinates the transimission power between three single-phase micro-capacitance sensors and three-phase microgrid.A kind of control method for coordinating of single three-phase mixed connection microgrid group of the present invention, primary control have the advantages of simple structure and easy realization, are not required to multiple rotary coordinate, reduce control algolithm and realize difficulty；Two-stage control is directly adjusted the power of microgrid group's point of common coupling, easy to operate, can preferably eliminate static error, and can also obtain preferable control effect when handling micro-capacitance sensor group voltage imbalance question.
Description
Technical field
The invention belongs to micro-capacitance sensor control technology field, the coordinated control side of specifically a kind of list three-phase mixed connection microgrid group
Method.
Background technique
As the expansion of micro-capacitance sensor application scale gradually starts appearance three to meet the more demands of user at this stage
List three-phase mixed connection microgrid group made of phase micro-capacitance sensor and single microgrid of a variety of phase sequences are series-parallel.Single three-phase mixed connection microgrid group is existing
Micro-capacitance sensor on the basis of, improve the reliability of regional scope user power utilization, the stability of economy and important load.Microgrid
Group will appear exveral phenomena about voltage imbalance when accessing unbalanced load, and Voltage unbalance will affect each equipment in microgrid group
It operates normally.In order to ensure the normal operation of equipment in microgrid group, it is necessary to be unfolded to further investigate to voltage imbalance question.
In existing technical literature:
Derivation of zero-sequence circulating current and the compensation
Of delta-connected static var generators for unbalanced load (Ma Fujun, Luo An,
Xiong Qiaopo, et al.Derivation of zero-sequence circulating current and the
compensation of delta-connected static var generators for unbalanced load[J]
.IET Power Electronics, 2016,9 (3): 576-588.) three-phase solved by installation electric energy quality compensating device
Unbalanced power and voltage fluctuation problem, although effect is obvious, investment operating cost is higher.
Flexible Active Power Control of Distributed Power Generation Systems
During Grid Faults(Rodriguez P,Timbus A V,Teodorescu R,et al.Flexible Active
Power Control of Distributed Power Generation Systems During Grid Faults[J]
.IEEE Transactions on Industrial Electronics, 2007,54 (5): 2583-2592.) it is based on instantaneous function
Rate theory proposes the flexible control of active power under imbalance, reactive power, separately designs for specific control target
Several control methods, but the coupling between each method is poor.
Grid-Fault Control Scheme for Three-Phase Photovoltaic Inverters With
Adjustable Power Quality Characteristics(Castilla M,Miret J,Sosa J L,et
al.Grid-Fault Control Scheme for Three-Phase Photovoltaic Inverters With
Adjustable Power Quality Characteristics[J].IEEE Transactions on Power
Electronics, 2010,25 (12): 2930-2940.) when network voltage occurs uneven, it is grid-connected inverse in three-phase three-wire system
Become in device and only contains control freely in conventional current reference expression formula so that zero-sequence component is not present in grid-connected current without the neutral conductor
Degree, be finally embodied in grid-connected current it is undistorted with instantaneously grid-connected power without the contradiction between fluctuation.
A Cooperative Imbalance Compensation Method for Distributed-
Generation Interface Converters(Po-Tai Cheng,Chien-An Chen,Tzung-Lin Lee,et
al.A Cooperative Imbalance Compensation Method for Distributed-Generation
Interface Converters[J].IEEE Transactions on Industry Applications,2007,45
(2): 805-815.) to reach unbalance control, a kind of addition sagging control plan of negative phase-sequence reactive power-conductance ring is proposed
Slightly, the strategy is limited to the regulating effect of output voltage, and control effect can compromise between imbalance compensation and voltage accuracy,
This compensation effect that will lead to Voltage unbalance cannot be optimal.
Summary of the invention
In order to solve the above technical problems, the present invention provides the control method for coordinating of single three-phase mixed connection microgrid group a kind of, it is primary
Control structure is simple, it is easy to accomplish, it is not required to multiple rotary coordinate, control algolithm is reduced and realizes difficulty；Two-stage control is directly right
The power of microgrid group's point of common coupling is adjusted, easy to operate, can preferably eliminate static error, and in processing micro-capacitance sensor
Preferable control effect can be also obtained when group's voltage imbalance question.
The technical scheme adopted by the invention is as follows:
A kind of control method for coordinating of list three-phase mixed connection microgrid group, comprising the following steps:
The Isobarically Control mathematical model that step 1, foundation are controlled based on ratio resonance, the model transfer function are as follows:
Wherein: s is complex frequency domain operator, kpFor proportionality constant, kiFor integral constant；ω0For resonance frequency.
Step 2, under rest frame, comparative example resonant controller is controlled, and sinusoidal ginseng is tracked under α β coordinate system
Electric current is examined, the control of ratio resonance has infinitely great gain at fundamental frequency, zero steady-state error may be implemented, avoid coupling
Conciliate coupled operational.
Step 3, using outer voltage, current inner loop double-closed-loop control, the double-closed-loop control is all made of ratio resonance control
Method processed, wherein outer voltage guarantees the precision of output voltage virtual value for being adjusted to the amplitude of output voltage；Electricity
Outer ring output result is pressed to input instruction as the current reference of current inner loop.
Voltage and current information at step 4, acquisition point of common coupling, and carries out power calculation, then to degree of unbalancedness into
Row judgement.The wherein transimission power degree of unbalancedness constraint equation between each phase bus are as follows:
Wherein:
In above-mentioned equation,For the output power of each phase in three-phase microgrid 1,For three-phase microgrid
Mean power,For the output power of each phase of energy storage device in three-phase microgrid 1,For three-phase
The output power of each phase of photovoltaic generation unit in micro-capacitance sensor 1.
When degree of unbalancedness≤5%, does not need Two-stage control and coordinate transimission power at point of common coupling.
When degree of unbalancedness > 5%, then Two-stage control is needed to coordinate the transimission power at point of common coupling.
Step 5, Two-stage control coordinate the transimission power between three single-phase micro-capacitance sensors and three-phase microgrid, wherein second level control
The objective optimization function of system are as follows:
Wherein, εjFor the coefficient of three-phase microgrid energy storage output power function, αfFor single-phase micro-capacitance sensor energy storage output power letter
Several coefficients, μiFor the coefficient of three-phase microgrid photovoltaic output power function, βgFor single-phase micro-capacitance sensor photovoltaic output power function
Coefficient；For the energy storage output power of single-phase micro-capacitance sensor and three-phase microgrid；It is micro- for single-phase micro-capacitance sensor and three-phase
The photovoltaic output power of power grid.
Two-stage control is by changing the photovoltaic output power in each single-phase micro-capacitance sensor, to meet point of common coupling first
The regulated quantity of place's transimission power is then combined when photovoltaic output power is not able to satisfy the regulated quantity of point of common coupling transimission power
Energy storage device, by the collective effect of photovoltaic generation unit and energy storage device, to meet the transimission power of point of common coupling to solve
The certainly voltage imbalance question of point of common coupling.
A kind of control method for coordinating of single three-phase mixed connection microgrid group of the present invention, primary control are controlled using ratio resonance (PR)
System, ratio resonant controller can realize zero steady state error control to AC signal under rest frame, have anti-network voltage wave
Dynamic ability.Under conditions of making full use of renewable energy power generation, Two-stage control is acted at micro-capacitance sensor group's point of common coupling
Transimission power realize control to unbalance voltage.This method is able to maintain the voltage stabilization of micro-capacitance sensor group, and micro- handling
Preferable control effect can be obtained when power grid group's Voltage unbalance.
Detailed description of the invention
Fig. 1 is single three-phase mixed connection microgrid group control structure chart.
Fig. 2 is primary control structural block diagram.
Fig. 3 is that micro-capacitance sensor group is in the degree of unbalancedness comparison diagram under different control strategies.
Specific embodiment
A kind of control method for coordinating of list three-phase mixed connection microgrid group, comprising the following steps:
The Isobarically Control mathematical model that step 1, foundation are controlled based on ratio resonance, the model transfer function are as follows:
Wherein: s is complex frequency domain operator, kpFor proportionality constant, kiFor integral constant；ω0For resonance frequency.
Step 2, under rest frame, comparative example resonant controller is controlled, and PR control avoids complicated abc-
Dq coordinate transform, tracks sinusoidal reference current under α β coordinate system, and the control of ratio resonance has infinitely great at fundamental frequency
Zero steady-state error may be implemented in gain, avoids coupling reconciliation coupled operational.
Step 3, using outer voltage, current inner loop double-closed-loop control, to realize that Isobarically Control, the double-closed-loop control are equal
Using proportional resonant control method, wherein outer voltage guarantees that output voltage has for being adjusted to the amplitude of output voltage
The precision of valid value；Outer voltage exports result as the current reference of current inner loop and inputs instruction.
Voltage and current information at step 4, acquisition point of common coupling, and carries out power calculation, then to degree of unbalancedness into
Row judgement.The wherein transimission power degree of unbalancedness constraint equation between each phase bus are as follows:
Wherein:
In above-mentioned equation,For the output power of each phase in three-phase microgrid 1,For three-phase microgrid
Mean power,For the output power of each phase of energy storage device in three-phase microgrid 1,For three-phase
The output power of each phase of photovoltaic generation unit in micro-capacitance sensor 1.
When degree of unbalancedness≤5%, does not need Two-stage control and coordinate transimission power at point of common coupling.
When degree of unbalancedness > 5%, then Two-stage control is needed to coordinate the transimission power at point of common coupling.
Step 5, Two-stage control coordinate the transimission power between three single-phase micro-capacitance sensors and three-phase microgrid, wherein second level control
The objective optimization function of system are as follows:
Wherein, εjFor the coefficient of three-phase microgrid energy storage output power function, αfFor single-phase micro-capacitance sensor energy storage output power letter
Several coefficients, μiFor the coefficient of three-phase microgrid photovoltaic output power function, βgFor single-phase micro-capacitance sensor photovoltaic output power function
Coefficient.
For the energy storage output power of single-phase micro-capacitance sensor and three-phase microgrid；For single-phase micro-capacitance sensor and three
The photovoltaic output power of phase micro-capacitance sensor.The objective optimization function is allowed simultaneously to maximumlly utilize renewable energy power generation
The generated energy of energy storage minimizes.
Two-stage control is by changing the photovoltaic output power in each single-phase micro-capacitance sensor, to meet point of common coupling first
The regulated quantity of place's transimission power is then combined when photovoltaic output power is not able to satisfy the regulated quantity of point of common coupling transimission power
Energy storage device, by the collective effect of photovoltaic generation unit and energy storage device, to meet the transimission power of point of common coupling to solve
The certainly voltage imbalance question of point of common coupling.
The energy storage constraint condition of the Two-stage control are as follows:
Wherein,For single-phase micro-capacitance sensor energy storage output power minimum value and maximum value,For the storage of single-phase micro-capacitance sensor
Energy output power,For three-phase microgrid energy storage output power minimum value and maximum value,For three-phase microgrid energy storage
Output power,Single-phase micro-capacitance sensor energy storage charge state minimum value and maximum value,For the storage of single-phase micro-capacitance sensor
Energy state-of-charge,For three-phase microgrid energy storage charge state minimum value and maximum value,For the micro- electricity of three-phase
Net energy storage charge state.
Photovoltaic constraint condition are as follows:
Wherein,It is micro- for the minimum value, maximum value and three-phase of single-phase micro-capacitance sensor photovoltaic output power
Minimum value, the maximum value of power grid photovoltaic output power；For the photovoltaic output power of single-phase micro-capacitance sensor,For the micro- electricity of three-phase
The photovoltaic output power of net.
Power-balance constraint condition are as follows:
A phase:
B phase:
C phase:
Wherein:It is defeated for the single-phase micro-capacitance sensor 2 of A phase, the single-phase micro-capacitance sensor 3 of B phase, the energy storage of the single-phase micro-capacitance sensor 4 of C phase
Power out,For the photovoltaic output work of the single-phase micro-capacitance sensor 2 of A phase, the single-phase micro-capacitance sensor 3 of B phase, the single-phase micro-capacitance sensor 4 of C phase
Rate,For each phase load power of microgrid group,It is exported for the energy storage of each phase of three-phase microgrid 1
Power,For the photovoltaic output power of each phase of three-phase microgrid 1.
Fig. 1 is single three-phase mixed connection microgrid group control structure chart.Microgrid group is made of 4 micro-capacitance sensors, wherein three-phase microgrid 1
It plays a leading role for three-phase microgrid and in entire more microgrids comprising energy storage device, photovoltaic generation unit and threephase load.
The single-phase micro-capacitance sensor 2 of A phase, the single-phase micro-capacitance sensor 3 of B phase, the single-phase micro-capacitance sensor 4 of C phase are single-phase micro-capacitance sensor and individually connect micro- in three-phase
A, B, C three-phase of power grid 1.Entire microgrid group is connected by simultaneously off-network switch L1 with power distribution network.When simultaneously off-network switch L1 is disconnected,
Microgrid group is in isolated operation mode, and the single-phase micro-capacitance sensor 2 of A phase, the single-phase micro-capacitance sensor 3 of B phase, the single-phase micro-capacitance sensor 4 of C phase still connect at this time
Voltage and frequency branch are provided in three-phase microgrid 1, and by the main power source energy storage in three-phase microgrid 1 for entire microgrid group
Support.
Primary control proportion of utilization resonant controller and Double closed-loop of voltage and current, to achieve the purpose that Isobarically Control,
Two-stage control is then controlled not by joint coordination three-phase microgrid and the transimission power of three single-phase micro-capacitance sensor point of common coupling
Balanced voltage.When transimission power degree of unbalancedness > 5%, it is single-phase first to calculate the single-phase micro-capacitance sensor 2 of A phase, the single-phase micro-capacitance sensor 3 of B phase, C phase
The regulated quantity △ P of transimission power at micro-capacitance sensor 4 and 1 point of common coupling of three-phase microgrid1、△P2、△P3, then more single-phase again
The adjustable amount △ P of the photovoltaic output power of micro-capacitance sensor 2,3,4PVWith the regulated quantity △ P of transimission power.
When each photovoltaic output power in the single-phase micro-capacitance sensor 2 of A phase, the single-phase micro-capacitance sensor 3 of B phase, the single-phase micro-capacitance sensor 4 of C phase
Adjustable amount △ PPVWhen more than or equal to transmission power adjustment amount △ P, then directly carried out by the photovoltaic generation unit of each single microgrid
Coordinate.When the single-phase micro-capacitance sensor 2 of A phase, the single-phase micro-capacitance sensor 3 of B phase, the single-phase micro-capacitance sensor 4 of C phase each photovoltaic output power it is adjustable
Measure △ PPVWhen less than △ P, then coordinated jointly by three-phase microgrid and each single microgrid.
Fig. 2 is primary control structural block diagram.Primary control is using ratio resonant controller, and control structure is voltage
The double-closed-loop control of outer ring current inner loop.The three-phase voltage that inverter exports is coordinately transformed under static coordinate first,
The floating regulation to controlled signal is realized using PR controller.Outer voltage exports result and joins as the electric current of current inner loop
Examine input instruction.Current inner loop, which constitutes electric current servomechanism, can greatly speed up the dynamic process for resisting disturbance.Voltage and current is double to be closed
Ring controls the status information for the system that takes full advantage of, and not only dynamic property is good, and stable state accuracy is also high.Ratio resonant controller
Transmission function are as follows:
Wherein, Kpv,KivFor outer voltage proportionality constant and integral constant, Kpi,KiiFor current inner loop proportionality constant and integral
Constant.In the present invention, the design of parameter are as follows: Kpv=0.4, Kiv=20, Kii=0.05, Kpi=1.
Three-phase alternating current control problem is converted two exchange control problems by the control method, avoids the positive-negative sequence of electric current
Component decomposable process.Ratio resonant controller is in resonance frequency omega0Gain with higher in relatively narrow broadband nearby, to limit
The steady-state error between control signal and reference signal is made.
Fig. 3 is the voltage unbalance factor pair that micro-capacitance sensor group proposes control strategy using Traditional control strategy and using the present invention
Than figure.The ratio of positive sequence and negative sequence voltage components is degree of unbalancedness.In t=0.4s, single-phase imbalance is accessed in microgrid group
Load (RB=6 Ω, LB=4mH), it is indicated respectively with solid line and dotted line in figure based on Traditional control strategy and based on this patent
It is proposed the voltage unbalance factor of control strategy.As seen from Figure 3, after single-phase load is added in t=0.4s, using Traditional control
The voltage unbalance factor of strategy is about 3.8%；The voltage unbalance factor that control strategy is proposed using the present invention is about 1.9%.On
The comparing result stated shows that the double-deck coordinated control system and method proposed by the invention, can when handling Voltage unbalance
Obtain preferable control effect.
Claims (2)
1. a kind of control method for coordinating of list three-phase mixed connection microgrid group, it is characterised in that the following steps are included:
The Isobarically Control mathematical model that step 1, foundation are controlled based on ratio resonance, the model transfer function are as follows:
Wherein: s is complex frequency domain operator, kpFor proportionality constant, kiFor integral constant；ω0For resonance frequency；
Step 2, under rest frame, comparative example resonant controller is controlled, under α β coordinate system track sinusoidal reference electricity
Stream, the control of ratio resonance have infinitely great gain at fundamental frequency, can be realized zero steady-state error；
Step 3, using outer voltage, current inner loop double-closed-loop control, the double-closed-loop control is all made of ratio resonance controlling party
Method, wherein outer voltage guarantees the precision of output voltage virtual value for being adjusted to the amplitude of output voltage；Outside voltage
Ring exports result as the current reference of current inner loop and inputs instruction；
Voltage and current information at step 4, acquisition point of common coupling, and power calculation is carried out, then degree of unbalancedness is sentenced
It is disconnected；The wherein transimission power degree of unbalancedness constraint equation between each phase bus are as follows:
Wherein:
In above-mentioned equation,For the output power of each phase in three-phase microgrid 1,For being averaged for three-phase microgrid
Power,For the output power of each phase of energy storage device in three-phase microgrid 1,For the micro- electricity of three-phase
The output power of each phase of photovoltaic generation unit in net 1；
When degree of unbalancedness≤5%, does not need Two-stage control and coordinate transimission power at point of common coupling；
When degree of unbalancedness > 5%, then Two-stage control is needed to coordinate the transimission power at point of common coupling；
Step 5, Two-stage control coordinate the transimission power between three single-phase micro-capacitance sensors and three-phase microgrid, wherein Two-stage control
Objective optimization function are as follows:
Wherein, εjFor the coefficient of three-phase microgrid energy storage output power function, αfFor single-phase micro-capacitance sensor energy storage output power function
Coefficient, μiFor the coefficient of three-phase microgrid photovoltaic output power function, βgWhat it is for single-phase micro-capacitance sensor photovoltaic output power function is
Number；For the energy storage output power of single-phase micro-capacitance sensor and three-phase microgrid；It is micro- for single-phase micro-capacitance sensor and three-phase
The photovoltaic output power of power grid；
Two-stage control is to be passed at point of common coupling by changing the photovoltaic output power in each single-phase micro-capacitance sensor to meet first
The regulated quantity of defeated power, when photovoltaic output power is not able to satisfy the regulated quantity of point of common coupling transimission power, then joint energy storage
Device, by the collective effect of photovoltaic generation unit and energy storage device, to meet the transimission power of point of common coupling.
2. a kind of control method for coordinating of single three-phase mixed connection microgrid group according to claim 1, it is characterised in that:
The energy storage constraint condition of the Two-stage control are as follows:
Wherein,For single-phase micro-capacitance sensor energy storage output power minimum value and maximum value,It is stored up for all single-phase micro-capacitance sensors
Energy output power,For three-phase microgrid energy storage output power minimum value and maximum value,For three-phase microgrid energy storage
Output power,For single-phase micro-capacitance sensor energy storage charge state minimum value and maximum value,For single-phase micro-capacitance sensor
Energy storage charge state,For three-phase microgrid energy storage charge state minimum value and maximum value,It is micro- for three-phase
Power grid energy storage charge state；
Photovoltaic constraint condition are as follows:
Wherein,For minimum value, maximum value and the three-phase microgrid of single-phase micro-capacitance sensor photovoltaic output power
Minimum value, the maximum value of photovoltaic output power；For the photovoltaic output power of single-phase micro-capacitance sensor,For the light of three-phase microgrid
Lie prostrate output power；
Power-balance constraint condition are as follows:
A phase:
B phase:
C phase:
Wherein:For the energy storage output work of the single-phase micro-capacitance sensor 2 of A phase, the single-phase micro-capacitance sensor 3 of B phase, the single-phase micro-capacitance sensor 4 of C phase
Rate,For the single-phase micro-capacitance sensor 2 of A phase, the single-phase micro-capacitance sensor 3 of B phase, the single-phase micro-capacitance sensor 4 of C phase photovoltaic output power,For each phase load power of microgrid group,For the energy storage output work of each phase of three-phase microgrid 1
Rate,For the photovoltaic output power of each phase of three-phase microgrid 1.
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