CN109066704A - A kind of micro-grid connection control method based on Active Disturbance Rejection Control - Google Patents
A kind of micro-grid connection control method based on Active Disturbance Rejection Control Download PDFInfo
- Publication number
- CN109066704A CN109066704A CN201810744950.3A CN201810744950A CN109066704A CN 109066704 A CN109066704 A CN 109066704A CN 201810744950 A CN201810744950 A CN 201810744950A CN 109066704 A CN109066704 A CN 109066704A
- Authority
- CN
- China
- Prior art keywords
- grid
- control
- voltage
- entry point
- micro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004146 energy storage Methods 0.000 claims abstract description 49
- 230000005611 electricity Effects 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000013178 mathematical model Methods 0.000 description 3
- 125000002619 bicyclic group Chemical group 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 101100499229 Mus musculus Dhrsx gene Proteins 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- 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
- H02J3/381—Dispersed generators
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The micro-grid connection control method based on Active Disturbance Rejection Control that the present invention provides a kind of, comprising the following steps: three-phase alternating voltage and three-phase alternating current of the acquisition energy storage device at grid entry point；The direct current signal of grid entry point electric current and the real-time virtual value of grid entry point voltage are calculated according to the alternating voltage and electric current；It when the grid entry point voltage exceeds safety requirements scope, controls the energy storage device and operates under reactive power support mode, injected to power grid or from power grid absorbing reactive power；It when the grid entry point voltage is located at the claimed range, controls the energy storage device and operates under constant-current mode, keep its original output.Micro-grid connection control method provided by the invention realizes quickly and effectively dynamic reactive support using the Reactive-power control ability of energy storage device, ensure that grid entry point voltage maintains in safety requirements scope, Active Disturbance Rejection Control makes reactive power support control have many advantages, such as that small overshoot, fast response time, control precision are high.
Description
Technical field
The invention belongs to Operation of Electric Systems control fields, and in particular to a kind of micro-grid connection based on Active Disturbance Rejection Control
Control method.
Background technique
Under the dual-pressure of energy demand and environmental protection, obtained using photovoltaic, wind-power electricity generation as the distributed generation resource of representative
To fast development.As the effective use tool of distributed generation resource, micro-capacitance sensor technology also becomes current research hotspot.Light storage
Micro-capacitance sensor is incorporated into the power networks with power distribution network, when the environmental conditions such as illumination change, power load changes and the failures such as short circuit occurs,
The obvious fluctuation that will cause points of common connection (PCC) voltage even will appear voltage out-of-limit when serious, need electric power to mend at this time
It repays equipment and adjusts interconnection trend rapidly, certain reactive power is injected or absorbed from power grid to power grid, unstability voltage is carried out
Support keeps grid entry point voltage in claimed range, improves grid stability and power supply reliability.
Traditional method is the reactive compensation for putting into the reactive power compensators such as SVG and SVC and being fixed, but this will increase throwing
Enter cost and is difficult to realize the dynamic regulation of grid entry point voltage.Also there is the reactive power for proposing to utilize photovoltaic combining inverter at present
Regulating power provides reactive power support, but photovoltaic DC-to-AC converter is limited by its capacity, it is active completely send out when idle fan-out capability compared with
It is weak；And photovoltaic DC-to-AC converter intermittent, randomness feature influence vulnerable to sunlight, the voltage support of fast and stable can not be provided.
Energy-storage system in micro-capacitance sensor just has quick insusceptible Reactive-power control ability, can be used as microgrid
Effective reactive source of system realizes reactive power support control.It is at present PI controller to the common control method of energy storage inverter, but
PI controller depends on the accurate model of controlled device, and good dynamic quality remaining is little, need to often be adjusted according to environmental change
Whole gain, and there are the intrinsic contradictions between overshoot and rapidity, so being difficult to obtain in strong jamming and Control of Nonlinear Systems
Obtain satisfied control effect.Auto Disturbances Rejection Control Technique is that Chinese Academy of Sciences researcher Mr. Han Jingqing proposes for PID controller disadvantage
A kind of nonlinear robust control technology, it has good anti-interference ability and control effect, not by plant model and
The influence of surrounding environment change still ensures that control precision under unknown strong nonlinearity and uncertain strong jamming effect, shows
Good future in engineering applications.
Summary of the invention
The purpose of the present invention is to provide the micro-grid connection control methods based on Active Disturbance Rejection Control, pass through reactive power support control
System keeps grid entry point voltage in safety requirements scope, improves grid stability and power supply reliability.The present invention is by active disturbance rejection control
In technical application processed is controlled to reactive power support, the shortcomings that can preferably overcoming conventional PI control device, be a kind of anti-interference ability
By force, the control method that dynamic property is good, control structure is simple, control precision is high, robustness is good.
For this purpose, the present invention provides a kind of micro-grid connection control method based on Active Disturbance Rejection Control, control system include
Micro-capacitance sensor containing energy storage device and the micro-capacitance sensor comprising micro- source, power distribution network, the micro-capacitance sensor containing energy storage device and comprising
The micro-capacitance sensor in micro- source is connected to power grid in grid entry point, the control method the following steps are included:
Acquire three-phase alternating voltage and three-phase alternating current of the energy storage device at the grid entry point；
According at the grid entry point three-phase alternating voltage and three-phase alternating current calculate the straight of the grid entry point electric current
Flow the real-time virtual value of signal and grid entry point voltage；
When the real-time virtual value of the grid entry point voltage exceed claimed range when, control the energy storage device operate in it is idle
Under support and control mode, to power distribution network injection or from the power distribution network absorbing reactive power, so that the electricity of the grid entry point
Pressure is stablized within the claimed range；
When the real-time virtual value of the grid entry point voltage is located at the claimed range, controls the energy storage device and operate in
Under constant-current mode, the constant output current of the energy storage device is kept.
Preferably, the three-phase alternating voltage is acquired by being connected to the voltage sensor of the grid entry point, and passed through
The current sensor for being connected to the grid entry point acquires the three-phase alternating current.
Preferably, the three-phase alternating voltage at the grid entry point and three-phase alternating current are converted by three-phase static coordinate system
To two-phase synchronous rotating frame, obtain the energy storage device grid entry point electric current direct current signal and grid entry point voltage it is real-time
Virtual value.
Preferably, because 20kV and following three phase supply voltage tolerance are ± the 7% of system nominal voltage, the safety
Claimed range is 1.07 times of 0.93 times of voltage rating to the power grid of the voltage rating of the power grid.
Preferably, the energy storage device operates under reactive power support control model, injects to the power grid or from the electricity
Net absorbing reactive power includes:
Obtain the first component and second component of current reference value；
To the first automatic disturbance rejection controller input the current DC signal the first component and first point of current reference value
Amount, first automatic disturbance rejection controller export first control signal；The second component of the current DC signal and electric current are joined
The second component for examining value inputs the input terminal of second automatic disturbance rejection controller, second control of the second automatic disturbance rejection controller output
Signal processed；
SPWM modulation wave signal is exported after the first control signal and second control signal are carried out coordinate conversion, by institute
It states SPWM modulation wave signal and triangular carrier carries out bipolar modulation and obtains the duty cycle signals of full-control type power device；
The duty cycle signals are exported to the control terminal of trigger pulse to energy storage inverter after power driving circuit amplifies,
Opening and turning off for the power switch circuit in the energy storage inverter is controlled, to realize the tracking control to the current reference value
System.
Preferably, the second component for obtaining current reference value includes:
The real-time virtual value of the grid entry point voltage and voltage reference value are input to third automatic disturbance rejection controller, export institute
State the second component of current reference value.
Preferably, the second component of the current reference value is exported further include:
Clipping is carried out to the second component of the current reference value according to the following formula:
Wherein, iqFor the second component of the current DC signal, UdcFor DC bus-bar voltage, udgFor grid entry point voltage
D axis component (q axis component is 0), ω are the angular speed of network voltage vector, and L is filter inductance value, and R is the equivalent electricity of filter inductance
Resistance；
The second component of the current reference value after clipping is input to the input terminal of second automatic disturbance rejection controller.
Preferably, when the real-time virtual value of the grid entry point voltage is lower than the claimed range, the voltage reference value
It is 0.93 times of the voltage rating of the power grid；When the real-time virtual value of the grid entry point voltage is higher than the claimed range,
The voltage reference value is 1.07 times of the voltage rating of the power grid.
Preferably, the first component of the current reference value is 0.
Preferably, it controls the energy storage device and operates in constant-current mode and include:
The parameter of the third automatic disturbance rejection controller is adjusted, so that the electric current of third automatic disturbance rejection controller output
The second component of reference value remains unchanged.
Compared with prior art, the micro-grid connection control method provided by the invention based on Active Disturbance Rejection Control utilizes micro- electricity
To realize, quickly and effectively dynamic reactive supports the Reactive-power control ability of energy storage device in net, it is ensured that grid entry point voltage maintains peace
In full claimed range, grid stability and power supply reliability are improved, the flexibility of micro-capacitance sensor itself is highlighted.Moreover, because control
Strategy is directly implemented on inverter, without increasing new control device, saves the equipment investment for being used for reactive compensation.The present invention
The Auto Disturbances Rejection Control Technique of use can preferably overcome the shortcomings that conventional PI control device, have preferable Control platform, good
Anti-interference ability and good robustness, do not depend on the accurate mathematical model of system, Guarantee control system in Parameter uncertainties, deposit
Stability under extraneous disturbed condition makes reactive power support have many advantages, such as that small overshoot, fast response time, control precision are high.
Detailed description of the invention
Fig. 1 is a kind of bicyclic control of reactive power support of the micro-grid connection control system based on Active Disturbance Rejection Control of the present invention
Structure chart processed；
Fig. 2 is a kind of single order Active Disturbance Rejection Control of the micro-grid connection control method based on Active Disturbance Rejection Control of the present invention
The structural schematic diagram of method；
Fig. 3 is a kind of flow chart of the micro-grid connection control method based on Active Disturbance Rejection Control of the present invention；
Fig. 4 is a kind of structural schematic diagram of the micro-grid connection control system based on Active Disturbance Rejection Control of the present invention；
Fig. 5 is a kind of simulation result diagram of the micro-grid connection control method based on Active Disturbance Rejection Control of the present invention,
In, abscissa is simulation time, and ordinate is grid entry point voltage per unit value；
Fig. 6 is a kind of simulation result diagram of the micro-grid connection control method based on Active Disturbance Rejection Control of the present invention,
In, abscissa is simulation time, and ordinate is reactive current reference value and the reactive current value that energy-storage units export.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution in embodiment is clearly and completely described, it should be understood that embodiment described herein be merely to illustrate and
It explains the present invention, is not intended to limit the present invention.The present embodiments relate to micro-grid connection control method can be applied to wind
In the micro grid control systems such as electricity, geothermal power generation, photoelectricity.As illustratively, following implementation only stores up micro-capacitance sensor simultaneously with light
Network control system is illustrated.
Fig. 1 is a kind of bicyclic control of reactive power support of the micro-grid connection control system based on Active Disturbance Rejection Control of the present invention
Structure chart processed.As shown in Figure 1, the control system includes the micro-capacitance sensor containing energy storage device and has other micro- sources (such as too
Positive energy, wind energy, tide energy etc.) micro-capacitance sensor, power load and power distribution network, the micro-capacitance sensor is connected to power distribution network in grid entry point.
Reactive power support of the energy storage device based on Active Disturbance Rejection Control is double -loop control structure, including grid entry point voltage control outer ring and electric current control
Inner ring processed, grid entry point voltage control outer ring and current control inner ring are all made of automatic disturbance rejection controller and are controlled.In addition, micro- electricity
Net grid-connection control system further includes detection acquisition module.
Current control inner ring includes the first automatic disturbance rejection controller, the second automatic disturbance rejection controller, coordinate converter and SPWM tune
Device processed.Wherein, the output end of the first automatic disturbance rejection controller and the second automatic disturbance rejection controller respectively with the detection acquisition module connects
It connects.First automatic disturbance rejection controller, the second automatic disturbance rejection controller output end connect respectively with coordinate converter, coordinate converter
Output end is connect with the SPWM modulator, the output end of the SPWM modulator and the control terminal of three-phase voltage source type inverter
Connection, so as to the control for turning on and off the power switch circuit in the inverter to realize to output electric current.
It includes third automatic disturbance rejection controller and clipping module, the third automatic disturbance rejection controller that grid entry point voltage, which controls outer ring,
Input terminal with it is described detection acquisition module output end connect, output end is connect with the input terminal of the clipping module.It is described
The output end of clipping module is connect with the input terminal of the second automatic disturbance rejection controller of the current control inner ring.
Detecting acquisition module includes the voltage sensor for being connected to the grid entry point and the electric current for being connected to the grid entry point
The output end of sensor, voltage sensor and current sensor is connected to data converter, and data converter is used for by described in simultaneously
Three-phase alternating voltage and three-phase alternating current at site are converted to the direct current signal and grid entry point voltage of the grid entry point electric current
Real-time virtual value.
First, second, and third automatic disturbance rejection controller include Nonlinear Tracking Differentiator TD, extended state observer ESO,
Nonlinear state error feeds back NLSEF.Nonlinear Tracking Differentiator TD is used for setting value v0Transition process arranging and extraction its differential letter
Number, extended state observer ESO is missed according to input signal y extraction system status information and disturbance summation information, nonlinear state
Difference feedback NLSEF generates nonlinearity erron feedback control amount with state error information and carries out according to disturbance estimated value to system
Disturbance compensation and generate final control amount u.
It can be seen that grid entry point voltage control outer ring and current control inner ring from the system mathematic model under dq0 coordinate system
Controlled system be first-order system, therefore use single order automatic disturbance rejection controller, as shown in Figure 2.Wherein, Nonlinear Tracking Differentiator TD is used
First differential tracker, control law are as follows:
Extended state observer ESO is Second Order Eso:
The governing equation of nonlinear state error feedback NLSEF are as follows:
Fal (x, α, δ) is common non-linear power function in formula, can avoid the higher-order of oscillation.α0,α1,α2,δ0,δ1,δ2,
r0,r1,β1,β2,b0It is adjustable parameter, it can be tracking differential TD, extended state observer ESO and non-linear in adjusting parameter
State error feedback NLSEF regards three independent parts as and carries out separation adjusting.
Fig. 3 is a kind of flow chart of micro-grid connection control method based on Active Disturbance Rejection Control of the present invention.Such as Fig. 3 institute
Show, which includes step S301~S303.
S301: three-phase alternating voltage and three-phase alternating current of the energy storage device at the grid entry point are acquired.This reality
It applies in mode, the three-phase alternating voltage can be acquired by being connected to the voltage sensor of the grid entry point, and pass through company
The current sensor for being connected to the grid entry point acquires the three-phase alternating current.For convenient for narration, the three-phase alternating voltage
It is denoted as ua,b,c, three-phase alternating current is denoted as ia,b,c。
S302: according at the grid entry point three-phase alternating voltage and three-phase alternating current calculate the grid entry point electric current
Direct current signal and grid entry point voltage real-time virtual value.It, can be quiet by phase-locked loop pll operation and three-phase in present embodiment
Only coordinate system (a, b, c) is to two-phase synchronous rotating frame (d, q) to three-phase alternating voltage ua,b,cWith three-phase alternating current ia,b,c
Transformation, obtains the direct current signal and the real-time virtual value V of grid entry point voltage of energy storage device grid entry point electric currentg.Wherein, the direct current signal
There is the first component i in two-phase synchronous rotating frame (d, q)dWith second component iq。
S303: when the real-time virtual value of the grid entry point voltage exceeds safety requirements scope, the energy storage device is controlled
It operates under reactive power support control model, to power distribution network injection or from the power distribution network absorbing reactive power, so that described
The voltage stabilization of grid entry point is within the claimed range.In present embodiment, because 20kV and following three phase supply voltage allow
Deviation is system nominal voltage UN± 7%, therefore the safety requirements scope be system nominal voltage UN± 7%.When grid-connected
The point real-time virtual value V of voltagegLess than 0.93 times system nominal voltage UNWhen, outer voltage reference value Vg *It is set as 0.93UN, allow simultaneously
Site voltage restores and stablizes in 0.93UNOn；And work as the real-time virtual value V of grid entry point voltagegGreater than 1.07 times UNWhen, outer voltage
Reference value Vg *It is set as 1.07UN, allow grid entry point voltage to restore and stablize in 1.07UNOn.
When detecting real-time virtual value VgWhen positioned at the claimed range, that is, the real-time virtual value VgIt is greater than or equal to
0.93 times of UNAnd it is less than or equal to 1.07 times of UNWhen, it controls the energy storage device and operates under constant-current mode, keep the storage
The original electric current output of energy device is constant, does not influence the voltage of the grid entry point.
To sum up, idle to the quick dynamic support of grid entry point voltage progress by injecting to power grid or being absorbed from power grid, make it
Stablize within (100 ± 7) % range of nominal tension, maintains the normal continuous operation of light storage micro-grid system.
In step S303, energy storage device base controls outer ring and current control inner ring by voltage and provides for grid entry point voltage
Quickly and effectively reactive power support.The energy storage device operates under reactive power support control model, injects to the power grid or from institute
Stating power grid absorbing reactive power includes:
Firstly, obtaining the first component i of current reference valuedrefWith second component iqref.In present embodiment, current reference
First component i of valuedrefIt can be set as 0.
Then, to the first automatic disturbance rejection controller input the current DC signal the first component and current reference value
One component, first automatic disturbance rejection controller export first control signal.Specifically, by the first component i of current DC signald
With the first component i of current reference valuedrefThe input terminal of the first automatic disturbance rejection controller is inputted, first automatic disturbance rejection controller is defeated
First control signal out.By the second component i of the current DC signalqWith the second component i of current reference valueqrefInput institute
The input terminal of the second automatic disturbance rejection controller is stated, second automatic disturbance rejection controller exports second control signal.
Then, output SPWM modulating wave is believed after the first control signal and second control signal being carried out coordinate conversion
Number, the SPWM modulation wave signal and triangular carrier are then subjected to bipolar modulation and obtain the duty ratio of full-control type power device
Signal；
Finally, the duty cycle signals to be exported to the control of trigger pulse to energy storage inverter after power driving circuit amplifies
End processed controls opening and turning off for the power switch circuit in the energy storage inverter, to realize to the current reference value
Tracing control.
The second component i of above-mentioned current reference valueqrefOuter ring is controlled by voltage to obtain.Specifically, described grid-connected
Point voltage control outer ring refers to grid entry point voltage VgAnd its reference value of setting is input in third automatic disturbance rejection controller.Third
The control amount of automatic disturbance rejection controller output is the reactive current reference value of energy-storage units output.Since three-phase inverter has maximum
The constraint condition of reversible time variant voltageAccording to three-phase inverter and filter circuit in dq0 coordinate
Mathematical model under system:
By idIt is set as 0, the clipping formula of reactive current can be obtained by being updated in constraint condition:
U in formuladcFor DC bus-bar voltage, udgFor the d axis component (q axis component is 0) of grid entry point voltage, ω is power grid electricity
The angular speed of vector is pressed, L is filter inductance value, and R is filter inductance equivalent resistance；
The reactive current value of acquisition need to be determined as the second component of current reference value after above-mentioned reactive current clipping
iqref, then be input in current control inner ring.
In order to verify the control method of above embodiment offer and the effect of system, verified below by way of example.
Light storage micro-grid connection Control System Imitation model as shown in Figure 4 is established on PSCAD/EMTDC emulation platform,
System parameter is shown in Table 1, system nominal voltage UNFor 380V, simulation step length is 1 μ s, and emulation total duration is 3.5s.
1 system parameter of table
Light stores up micro-grid connection operation, and power load at the beginning is active power 51kW, reactive power 10kVAR, light spoke
Illuminance setting is 200W/m2.The 0.2s moment starts the reactive power support control of energy-storage units；1s moment light irradiance enhances
550W/m2；The 2s moment cuts off burden with power 16kW.
Fig. 5 is a kind of simulation result diagram of the micro-grid connection control method based on Active Disturbance Rejection Control of the present invention,
In, abscissa is simulation time, and ordinate is grid entry point voltage per unit value.Fig. 6 is of the present invention a kind of based on active disturbance rejection control
The simulation result diagram of the micro-grid connection control method of system, wherein abscissa is simulation time, and ordinate is reactive current reference
Value and the reactive current value of energy-storage units output.As shown in Figure 5, Figure 6, the pervious grid entry point voltage of 0.2s is 0.925pu, is lower than
Lower limit 0.93pu；Grid entry point voltage is adjusted to rapidly 0.93pu simultaneously by original 0.925pu after 0.2s starting reactive power support control
Keep, as shown in Figure 6 at this time energy-storage units output reactive current be positive value, i.e., at this time energy-storage units to power grid injection it is idle with
It is lifted grid entry point voltage；1s-2s increases photovoltaic system output power because light irradiance enhances, and grid entry point voltage rises to
Near 1.042pu, within the scope of limit value (100 ± 7) %, energy-storage units are operated under constant-current mode at this time as shown in Figure 6,
The reactive current of output remains unchanged, and does not influence the size of grid entry point voltage；Grid entry point voltage is due to cutting off burden with power when 2s
Rise and exceed the upper limit, restore rapidly under reactive power support control model again and stablize on 1.07pu, as shown in Figure 6 energy storage list at this time
The reactive current of member output is negative value, i.e., energy-storage units are idle to reduce grid entry point voltage from power grid absorption at this time.In addition, Fig. 6
Middle reactive current reference value is essentially coincided with reality output reactive current value, illustrates that the current inner loop based on Active Disturbance Rejection Control has
Preferable current follow-up control effect.
The light storage micro-grid system reactive power support control method based on Active Disturbance Rejection Control that present embodiment proposes can be abundant
It provides quickly and effectively reactive voltage using the Reactive-power control ability of energy-storage units to support, it is ensured that grid entry point voltage maintains limit value
In range.The Auto Disturbances Rejection Control Technique of use has preferable Control platform, good anti-interference ability and good robustness,
Do not depend on the accurate mathematical model of system, Guarantee control system in Parameter uncertainties, there are stability when external interference,
Reactive power support is set to have many advantages, such as that small overshoot, fast response time, control precision are high.The operation result of simulation example also demonstrates this
The validity and feasibility of control method.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, therefore
Without departing from the technical solutions of the present invention, according to the technical essence of the invention it is to the above embodiments it is any modification,
Equivalent variations and modification, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of micro-grid connection control method based on Active Disturbance Rejection Control, it is characterised in that: control system includes containing energy storage
The micro-capacitance sensor of device and micro-capacitance sensor, power distribution network comprising micro- source, the micro-capacitance sensor containing energy storage device and include the micro- of micro- source
Power grid is connected to power grid in grid entry point, the control method the following steps are included:
Acquire three-phase alternating voltage and three-phase alternating current of the energy storage device at the grid entry point；
According at the grid entry point three-phase alternating voltage and three-phase alternating current calculate the grid entry point electric current direct current letter
Number and grid entry point voltage real-time virtual value；
When the real-time virtual value of the grid entry point voltage exceeds claimed range, controls the energy storage device and operate in reactive power support
Under control model, to power distribution network injection or from the power distribution network absorbing reactive power, so that the voltage of the grid entry point is steady
It is scheduled within the claimed range；
When the real-time virtual value of the grid entry point voltage is located at the claimed range, control the energy storage device operate in it is constant
Under current-mode, the constant output current of the energy storage device is kept.
2. the micro-grid connection control method based on Active Disturbance Rejection Control as described in claim 1, it is characterised in that: pass through connection
The three-phase alternating voltage is acquired in the voltage sensor of the grid entry point, and the electric current by being connected to the grid entry point passes
Sensor acquires the three-phase alternating current.
3. the micro-grid connection control method based on Active Disturbance Rejection Control as described in claim 1, it is characterised in that: described grid-connected
Three-phase alternating voltage and three-phase alternating current at point are converted into two-phase synchronous rotating frame by three-phase static coordinate system, obtain
To the energy storage device in the direct current signal of grid entry point electric current and the real-time virtual value of grid entry point voltage.
4. the micro-grid connection control method based on Active Disturbance Rejection Control as described in claim 1, it is characterised in that: the requirement
Range is 1.07 times of 0.93 times of voltage rating to the power grid of the voltage rating of the power distribution network.
5. the micro-grid connection control method according to any one of claims 1-4 based on Active Disturbance Rejection Control, it is characterised in that:
The energy storage device operates under reactive power support control model, injects to the power grid or from the power grid absorbing reactive power packet
It includes:
Obtain the first component and second component of current reference value；
The first component of the current DC signal and the first component of current reference value, institute are inputted to the first automatic disturbance rejection controller
State the first automatic disturbance rejection controller output first control signal；By the second component of the current DC signal and current reference value
Second component inputs the input terminal of second automatic disturbance rejection controller, the second control of the second automatic disturbance rejection controller output letter
Number；
SPWM modulation wave signal is exported after the first control signal and second control signal are carried out coordinate conversion, it will be described
SPWM modulation wave signal and triangular carrier carry out bipolar modulation and obtain the duty cycle signals of full-control type power device；
The duty cycle signals are exported to the control terminal of trigger pulse to energy storage inverter after power driving circuit amplifies, are controlled
Power switch circuit in the energy storage inverter being opened and turning off, to realize the tracing control to the current reference value.
6. the micro-grid connection control method based on Active Disturbance Rejection Control as claimed in claim 5, which is characterized in that obtain electric current
The second component of reference value includes:
The real-time virtual value of the grid entry point voltage and voltage reference value are input to third automatic disturbance rejection controller, export the electricity
Flow the second component of reference value.
7. the micro-grid connection control method based on Active Disturbance Rejection Control as claimed in claim 6, which is characterized in that described in output
The second component of current reference value further include:
Clipping is carried out to the second component of the current reference value according to the following formula:
Wherein, iqFor the second component of the current DC signal, UdcFor DC bus-bar voltage, udgFor the d axis of grid entry point voltage
Component, ω are the angular speed of network voltage vector, and L is filter inductance value, and R is filter inductance equivalent resistance；
The second component of the current reference value after clipping is input to the input terminal of second automatic disturbance rejection controller.
8. the micro-grid connection control method based on Active Disturbance Rejection Control as claimed in claim 7, it is characterised in that: when it is described simultaneously
When the real-time virtual value of site voltage is lower than the claimed range, the voltage reference value is the voltage rating of the power grid
0.93 times；When the real-time virtual value of the grid entry point voltage is higher than the claimed range, the voltage reference value is the electricity
1.07 times of the voltage rating of net.
9. the micro-grid connection control method based on Active Disturbance Rejection Control as claimed in claim 8, it is characterised in that: the electric current
First component of reference value is 0.
10. the micro-grid connection control method based on Active Disturbance Rejection Control as claimed in claim 9, which is characterized in that control institute
It states energy storage device and operates in constant-current mode and include:
The parameter of the third automatic disturbance rejection controller is adjusted, so that the current reference of third automatic disturbance rejection controller output
The second component of value remains unchanged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810744950.3A CN109066704A (en) | 2018-07-09 | 2018-07-09 | A kind of micro-grid connection control method based on Active Disturbance Rejection Control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810744950.3A CN109066704A (en) | 2018-07-09 | 2018-07-09 | A kind of micro-grid connection control method based on Active Disturbance Rejection Control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109066704A true CN109066704A (en) | 2018-12-21 |
Family
ID=64819628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810744950.3A Pending CN109066704A (en) | 2018-07-09 | 2018-07-09 | A kind of micro-grid connection control method based on Active Disturbance Rejection Control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109066704A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011296A (en) * | 2019-03-12 | 2019-07-12 | 浙江工业大学 | A kind of direct-current grid distribution droop control method based on Auto Disturbances Rejection Control Technique |
| CN110323761A (en) * | 2019-06-26 | 2019-10-11 | 海南电网有限责任公司 | A method of the large sized unit of reply load transition impacts power grid |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203536959U (en) * | 2013-10-23 | 2014-04-09 | 上海电力学院 | Dual loop control system based on active disturbance rejection |
| CN104201706A (en) * | 2014-09-04 | 2014-12-10 | 北京艾科迈新能源科技有限公司 | Energy storage cooperative control method giving consideration to fault ride-through as well as grid-connected and off-grid seamless switching |
| CN105633959A (en) * | 2016-03-04 | 2016-06-01 | 易事特集团股份有限公司 | Uninterruptible power supply and control method thereof |
| US20160285273A1 (en) * | 2013-03-19 | 2016-09-29 | Merus Power Dynamics Oy | Method and apparatus for compensating non-active currents in electrical power networks |
| CN207442467U (en) * | 2017-12-04 | 2018-06-01 | 河南城建学院 | A kind of two-stage type photovoltaic inverter grid-connected control device |
| CN108123475A (en) * | 2016-11-29 | 2018-06-05 | 张喜军 | A kind of Auto Disturbances Rejection Control Technique of microgrid operation controller |
-
2018
- 2018-07-09 CN CN201810744950.3A patent/CN109066704A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160285273A1 (en) * | 2013-03-19 | 2016-09-29 | Merus Power Dynamics Oy | Method and apparatus for compensating non-active currents in electrical power networks |
| CN203536959U (en) * | 2013-10-23 | 2014-04-09 | 上海电力学院 | Dual loop control system based on active disturbance rejection |
| CN104201706A (en) * | 2014-09-04 | 2014-12-10 | 北京艾科迈新能源科技有限公司 | Energy storage cooperative control method giving consideration to fault ride-through as well as grid-connected and off-grid seamless switching |
| CN105633959A (en) * | 2016-03-04 | 2016-06-01 | 易事特集团股份有限公司 | Uninterruptible power supply and control method thereof |
| CN108123475A (en) * | 2016-11-29 | 2018-06-05 | 张喜军 | A kind of Auto Disturbances Rejection Control Technique of microgrid operation controller |
| CN207442467U (en) * | 2017-12-04 | 2018-06-01 | 河南城建学院 | A kind of two-stage type photovoltaic inverter grid-connected control device |
Non-Patent Citations (1)
| Title |
|---|
| 郑天文 等: "锂电池储能系统充放电的双闭环自抗扰控制器设计", 《电机与控制学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011296A (en) * | 2019-03-12 | 2019-07-12 | 浙江工业大学 | A kind of direct-current grid distribution droop control method based on Auto Disturbances Rejection Control Technique |
| CN110011296B (en) * | 2019-03-12 | 2021-02-26 | 浙江工业大学 | Direct-current micro-grid distributed droop control method based on active disturbance rejection control technology |
| CN110323761A (en) * | 2019-06-26 | 2019-10-11 | 海南电网有限责任公司 | A method of the large sized unit of reply load transition impacts power grid |
| CN110323761B (en) * | 2019-06-26 | 2023-08-18 | 海南电网有限责任公司 | Method for coping with impact of load jump high-capacity unit on power grid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Mishra et al. | Voltage control of PV inverter connected to unbalanced distribution system | |
| CN104734191A (en) | Photovoltaic grid-connected inverter low-voltage ride through method based on reactive current injection | |
| CN109066817A (en) | A kind of light storage micro-grid system and reactive power support control method based on Active Disturbance Rejection Control | |
| CN104135021A (en) | Voltage optimization control method of off-grid energy storage converter based on compound control | |
| CN109066704A (en) | A kind of micro-grid connection control method based on Active Disturbance Rejection Control | |
| CN108512247A (en) | Photovoltaic virtual synchronous control method based on Lagrange's interpolation prediction | |
| Chishti et al. | Grid integration of renewable energy generating system using nonlinear harmonic observer under nonideal distribution system | |
| Basit et al. | Recent developments and future research recommendations of control strategies for wind and solar PV energy systems | |
| Zafar et al. | On design of DC-link voltage controller and PQ controller for grid connected VSC for microgrid application | |
| Dahiya | Superconducting magnetic energy storage coupled static compensator for stability enhancement of the doubly fed induction generator integrated system | |
| Pati et al. | Stability analysis of photovoltaic system under grid faults | |
| Sezen et al. | Modeling, simulation and control of three-phase three level multilevel inverter for grid connected photovoltaic system | |
| Phap et al. | Design of novel grid-tied solar—Wind hybrid power plant using photovoltaic cell emulating system | |
| Zhang et al. | Impedance modeling and control of STATCOM for damping renewable energy system resonance | |
| CN109066816A (en) | A kind of micro-grid connection control system can provide reactive power support | |
| Errami et al. | Performance evaluation of variable structure and linear control strategies for grid connected PMSG wind energy system under different operating conditions | |
| Phap et al. | Modeling and experimental test of grid-tied photovoltaic cell emulating system in the stand-alone mode | |
| Sattar et al. | Modeling and control of multi-functional 3-ϕ grid-connected photovoltaic power system | |
| Musarrat et al. | FOSMC versus PI for the control of the grid side converter of a DFIG-based wind turbine | |
| Xiahou et al. | Robust current sensorless control of VSC-based MTDC transmissions for integrating wind farms | |
| Chen et al. | Terminal sliding-mode control scheme for grid-side PWM converter of DFIG-based wind power system | |
| Yan et al. | Frequency regulation for double-stage grid-connected PV generation | |
| Soreng et al. | Design of a grid integrated PV system with MPPT control and voltage oriented controller using MATLAB/PLECES | |
| Zhang et al. | Small signal analysis of photovoltaic-energy storage integrated virtual synchronous generator | |
| Vanaja et al. | Interval type-2 fuzzy controller-based power quality enhancement in HSES grid-Integrated scheme |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181221 |