CN109066816A - A kind of micro-grid connection control system can provide reactive power support - Google Patents
A kind of micro-grid connection control system can provide reactive power support 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
- 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
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Abstract
The present invention provides a kind of micro-grid connection control systems that can provide reactive power support, it is connected on power distribution network by DC converter, inverter, filter in grid entry point including the micro-capacitance sensor containing energy storage device and other micro- sources, power distribution network, detection acquisition module, data converter and energy-storage units control module, micro- source and energy-storage units.Micro-grid connection control system 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 is maintained in safety requirements scope, grid stability and power supply reliability are improved, the flexibility of micro-capacitance sensor itself is highlighted；Auto Disturbances Rejection Control Technique in control module has many advantages, such as preferable Control platform, good anti-interference ability and good robustness, and reactive power support control is made to have small overshoot, fast response time, control precision high.
Description
Technical field
The invention belongs to Operation of Electric Systems control fields, and in particular to a kind of micro-grid connection that can provide reactive power support
Control system.
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 systems of achievable reactive power support, keep grid entry point voltage
In safety requirements scope, grid stability and power supply reliability are improved.
For this purpose, the present invention provides a kind of micro-grid connection control systems that can provide reactive power support, which is characterized in that packet
Include the micro-capacitance sensor containing energy storage device and the micro-capacitance sensor containing micro- source, power distribution network, detection acquisition module, data converter and energy storage
Unit control module, micro- source and energy-storage units pass through DC converter, inverter, filter respectively and are connected in grid entry point
On the power distribution network；
The detection acquisition module is used to acquire the three-phase alternating current for the grid entry point that the energy-storage units are connect with power distribution network
Pressure and three-phase alternating current；
The data converter is connect with the detection acquisition module, for according to the three-phase alternating current at the grid entry point
Pressure and three-phase alternating current calculate the direct current signal of the grid entry point electric current and the real-time virtual value of grid entry point voltage；
The energy-storage units control module controls institute when the real-time virtual value of the grid entry point voltage exceeds claimed range
It states energy storage device to operate under reactive power support control model, be injected to the power grid or from the power grid absorbing reactive power, makes
The voltage stabilization of the grid entry point is obtained within the claimed range；It is located in the real-time virtual value of the grid entry point voltage described
It when claimed range, controls the energy storage device and operates under constant-current mode, keep the energy storage device constant output current,
The voltage of the grid entry point is not influenced.
Preferably, the detection acquisition module includes voltage sensor and current sensor, the voltage sensor connection
In the grid entry point, for acquiring the three-phase alternating voltage for the grid entry point that the energy-storage units are connect with power distribution network；The electric current
Sensor is connected to the grid entry point, for acquiring the three-phase alternating current for the grid entry point that the energy-storage units are connect with power distribution network
Stream.
Preferably, the data converter by the grid entry point three-phase alternating voltage and three-phase alternating current pass through three
Phase rest frame is converted into two-phase synchronous rotating frame, obtain the energy storage device grid entry point electric current direct current signal and
The real-time virtual value of grid entry point voltage.
Preferably, safety requirements scope described in the energy-storage units control module is ± the 7% of system nominal voltage.
Preferably, the energy-storage units control module includes current control inner ring and grid entry point voltage controls outer ring, described
Current control inner ring is used for follow current reference value, and the current reference value includes the first component and second component, described grid-connected
Point voltage control outer ring is used to obtain the second component of the current reference value.
Preferably, the current control inner ring includes:
First automatic disturbance rejection controller, input terminal are connect with the output end of the detection acquisition module, output end and the seat
The input terminal connection of converter is marked, first automatic disturbance rejection controller receives the first component and current reference of the direct current signal
First component of value exports first control signal；
Second automatic disturbance rejection controller, input terminal and the grid entry point voltage control the defeated of outer ring and the detection acquisition module
Outlet connection, output end are connect with the input terminal of the coordinate converter, and the input terminal of second automatic disturbance rejection controller receives
The second component of the second component of the direct current signal and the current reference value of grid entry point voltage control outer ring output, output
Second control signal；
Coordinate converter, output end and the SPWM modulator, the coordinate converter by the first control signal and
Second control signal exports SPWM modulation wave signal after carrying out coordinate conversion；
SPWM modulator, output end are connect with the control terminal of three-phase voltage source type inverter, and the SPWM modulator is by institute
It states SPWM modulation wave signal and triangular carrier and carries out bipolar modulation and obtain the duty cycle signals of full-control type power device, described three
The control terminal of phase inverter receives the duty cycle signals, and trigger pulse control power is exported after power driving circuit amplifies and is opened
Powered-down road opening and turning off, to realize the tracing control to the current reference value.
Preferably, the first component of the current reference value is 0.
Preferably, the grid entry point voltage control outer ring includes third automatic disturbance rejection controller, the third Active Disturbance Rejection Control
The input terminal of device is connect with the output end of the detection acquisition module, the second active disturbance rejection of output end and the current control inner ring
The input terminal of controller connects, and the third automatic disturbance rejection controller receives the real-time virtual value and voltage ginseng of the grid entry point voltage
Value is examined, the second component of the current reference value is exported.
Preferably, the grid entry point voltage control outer ring further includes clipping module, the input terminal of the clipping module and institute
The output end connection of third automatic disturbance rejection controller is stated, output end is defeated with the second automatic disturbance rejection controller of the current control inner ring
Enter end connection, the clipping module carries out clipping 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, the constant-current mode is to adjust the parameter of the third automatic disturbance rejection controller, so that the third
The second component of the current reference value of automatic disturbance rejection controller output remains unchanged.
Compared with prior art, the micro-grid connection control system provided by the invention that can provide reactive power support is stored up using light
To realize, quickly and effectively dynamic reactive supports the Reactive-power control ability of energy storage device in microgrid, it is ensured that grid entry point voltage is maintained at
In safety requirements scope, grid stability and power supply reliability are improved, the flexibility of micro-capacitance sensor itself is highlighted.Moreover, because control
System strategy is directly implemented on inverter, without increasing new control device, saves the equipment investment for being used for reactive compensation.This hair
The Auto Disturbances Rejection Control Technique of bright use can preferably overcome the shortcomings that conventional PI control device, with preferable Control platform, well
Anti-interference ability and good robustness, do not depend on the accurate mathematical model of system, Guarantee control system Parameter uncertainties,
There are the stability in the case of external interference, and reactive power support is made to 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 structural schematic diagram for the micro-grid connection control system that can provide reactive power support of the present invention；
Fig. 2 is a kind of single order Active Disturbance Rejection Control for the micro-grid connection control system that can provide reactive power support of the present invention
The structural schematic diagram of method；
Fig. 3 is a kind of flow chart for the micro-grid connection control system that can provide reactive power support of the present invention；
Fig. 4 is a kind of simulation result diagram for the micro-grid connection control system that can provide reactive power support of the present invention,
In, abscissa is simulation time, and ordinate is grid entry point voltage per unit value；
Fig. 5 is a kind of simulation result diagram for the micro-grid connection control system that can provide reactive power support 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 structural schematic diagram for the micro-grid connection control system that can provide reactive power support of the present invention.Such as
Shown in Fig. 1, the control system includes the micro-capacitance sensor containing energy storage device and has other micro- sources (such as solar energy, wind energy, a tide
Nighttide can wait) micro-capacitance sensor, power load and power distribution network, the micro-capacitance sensor is connected to power distribution network in grid entry point.In present embodiment,
Using solar cell and battery as independent micro- source, successively by DC/DC converter, three-phase voltage source type inverter, LCL filter
It is connected respectively on power distribution network after wave device.Due to the presence of line impedance, when power load and photovoltaic system output power occur
When variation, grid entry point voltage, which will appear, to rise sharply or temporarily drops, and present embodiment utilizes the Reactive-power control ability of energy-storage units, to grid-connected
Point voltage provides quickly and effectively reactive power support.As shown in Figure 1, the energy-storage units control module is double -loop control structure,
Outer ring and current control inner ring are controlled including grid entry point voltage, grid entry point voltage control outer ring and current control inner ring are all made of certainly
Disturbance rejection control device is controlled.In addition, the micro-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 system that can provide reactive power support 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 grid injection or from the power grid absorbing reactive power, so that described grid-connected
The voltage stabilization of point is within the claimed range.In present embodiment, because of 20kV and following three phase supply voltage tolerance
For system nominal voltage UN± 7%, therefore the safety requirements scope be system nominal voltage UN± 7%.When grid entry point electricity
Virtual value V when compactinggLess than 0.93 times system nominal voltage UNWhen, outer voltage reference value Vg *It is set as 0.93UN, allow grid entry point
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 its original
Output, 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 1 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. 4 is a kind of simulation result diagram for the micro-grid connection control system that can provide reactive power support of the present invention,
In, abscissa is simulation time, and ordinate is grid entry point voltage per unit value；Fig. 5 is that one kind of the present invention can provide idle branch
The simulation result diagram of the micro-grid connection control system of support, 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 4, Figure 5, 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 5 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 5,
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 5 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. 5
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 connection control system based on Active Disturbance Rejection Control that present embodiment proposes can make full use of storage
The Reactive-power control ability of energy unit provides quickly and effectively reactive voltage and supports, it is ensured that grid entry point voltage maintains limits
It is interior.The Auto Disturbances Rejection Control Technique of use has preferable Control platform, good anti-interference ability and good robustness, disobeys
Rely the accurate mathematical model of system, Guarantee control system in Parameter uncertainties, there are stability when external interference, make nothing
Function support has many advantages, such as that small overshoot, fast response time, control precision are high.It is grid-connected that the operation result of simulation example also demonstrates this
The validity and feasibility of control system.
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 (9)
1. a kind of micro-grid connection control system that can provide reactive power support, it is characterised in that: including containing the micro- of energy storage device
Power grid and micro-capacitance sensor containing micro- source, power distribution network, detection acquisition module, data converter and energy-storage units control module, it is described
Micro- source and energy-storage units pass through DC converter, inverter, filter respectively and are connected on the power distribution network in grid entry point；
It is described detection acquisition module be used for acquire the grid entry point that the energy-storage units are connect with power distribution network three-phase alternating voltage and
Three-phase alternating current；The detection acquisition module includes voltage sensor and current sensor, and the voltage sensor is connected to
The grid entry point, for acquiring the three-phase alternating voltage for the grid entry point that the energy-storage units are connect with power distribution network；The electric current passes
Sensor is connected to the grid entry point, for acquiring the three-phase alternating current for the grid entry point that the energy-storage units are connect with power distribution network
The data converter is connect with the detection acquisition module, for according at the grid entry point three-phase alternating voltage and
Three-phase alternating current calculates the direct current signal of the grid entry point electric current and the real-time virtual value of grid entry point voltage；
The energy-storage units control module controls the storage when the real-time virtual value of the grid entry point voltage exceeds claimed range
Energy device operates under reactive power support control model, to power grid injection or from the power grid absorbing reactive power, so that institute
The voltage stabilization of grid entry point is stated within the claimed range；It is located at the requirement in the real-time virtual value of the grid entry point voltage
It when range, controls the energy storage device and operates under constant-current mode, keep the energy storage device constant output current.
2. can provide the micro-grid connection control system of reactive power support as described in claim 1, it is characterised in that:
The data converter by the grid entry point three-phase alternating voltage and three-phase alternating current pass through three phase static coordinate
System is converted into two-phase synchronous rotating frame, obtains the energy storage device in the direct current signal and grid entry point voltage of grid entry point electric current
Real-time virtual value.
3. can provide the micro-grid connection control system of reactive power support as described in claim 1, it is characterised in that: the energy storage
Safety requirements scope described in unit control module is ± the 7% of system nominal voltage.
4. the micro-grid connection control system as described in any one of claims 1-3 that can provide reactive power support, it is characterised in that:
The energy-storage units control module includes current control inner ring and grid entry point voltage control outer ring, and the current control inner ring is used for
Follow current reference value, the current reference value include the first component and second component, and the grid entry point voltage control outer ring is used
In the second component for obtaining the current reference value.
5. can provide the micro-grid connection control system of reactive power support as claimed in claim 4, which is characterized in that the electric current
Controlling inner ring includes:
First automatic disturbance rejection controller, input terminal are connect with the output end of the detection acquisition module, and output end and the coordinate turn
The input terminal of parallel operation connects, and first automatic disturbance rejection controller receives the first component and current reference value of the direct current signal
First component exports first control signal；
The output end of second automatic disturbance rejection controller, input terminal and grid entry point voltage control outer ring and the detection acquisition module
Connection, output end are connect with the input terminal of the coordinate converter, described in the input terminal reception of second automatic disturbance rejection controller
The second component of the second component of direct current signal and the current reference value of grid entry point voltage control outer ring output, output second
Control signal；
Coordinate converter, output end and the SPWM modulator, the coordinate converter is by the first control signal and second
It controls after signal carries out coordinate conversion and exports SPWM modulation wave signal；
SPWM modulator, output end are connect with the control terminal of three-phase voltage source type inverter, and the SPWM modulator 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 three-phase
The control terminal of inverter receives the duty cycle signals, and trigger pulse is exported after power driving circuit amplifies and controls power switch
Circuit being opened and turning off, to realize the tracing control to the current reference value.
6. can provide the micro-grid connection control system of reactive power support as claimed in claim 5, it is characterised in that: the electric current
First component of reference value is 0.
7. can provide the micro-grid connection control system of reactive power support as claimed in claim 6, it is characterised in that: described grid-connected
Point voltage control outer ring includes third automatic disturbance rejection controller, and the input terminal of the third automatic disturbance rejection controller and the detection acquire
The output end of module connects, and output end is connect with the input terminal of the second automatic disturbance rejection controller of the current control inner ring, described
Third automatic disturbance rejection controller receives the real-time virtual value and voltage reference value of the grid entry point voltage, exports the current reference value
Second component.
8. can provide the micro-grid connection control system of reactive power support as claimed in claim 7, it is characterised in that: described grid-connected
Point voltage control outer ring further includes clipping module, the output of the input terminal of the clipping module and the third automatic disturbance rejection controller
End connection, output end are connect with the input terminal of the second automatic disturbance rejection controller of the current control inner ring, the clipping module root
Clipping is carried out according to second component of the following formula to the current reference value:
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 (q axis component is 0), 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.
9. can provide the micro-grid connection control system of reactive power support as claimed in claim 8, it is characterised in that: described constant
Current-mode is the parameter for adjusting the third automatic disturbance rejection controller, so that the electricity of third automatic disturbance rejection controller output
The second component of stream reference value remains unchanged.
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