CN109066788A - A kind of load virtual synchronous machine control device and method without configuring energy storage - Google Patents
A kind of load virtual synchronous machine control device and method without configuring energy storage 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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- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- 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
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Abstract
本发明公开一种无需配置储能的负荷虚拟同步机控制装置及方法，主电路结构为：三相PWM整流器通过其直流母线连接一个或多个直流负荷，通过其交流母线连接(一个或多个)本地负荷并接入配电网；PWM整流器的控制装置采集量包括：直流母线电压，交流母线电压，整流器输出的交流电流，交流侧本地负荷总电流。利用直流负荷的直流电压‑功率响应特性设计频率‑直流电压控制环路，采用超前滞后阻尼环节提高系统动态阻尼支撑能力，能够实现负荷虚拟同步机的自同步运行和惯量/一次调节功能。具有惯量补偿和一次调节2种独立的控制模式，并且通过增加交流侧本地负荷电流采集和控制电路实现负荷虚拟同步机交流侧本地负荷惯量补偿的额外功能。
The invention discloses a load virtual synchronous machine control device and method without configuring energy storage. The main circuit structure is: a three-phase PWM rectifier is connected to one or more DC loads through its DC bus, ) local load and connected to the distribution network; the collection data of the control device of the PWM rectifier includes: DC bus voltage, AC bus voltage, AC current output by the rectifier, and total current of the local load on the AC side. The frequency-DC voltage control loop is designed using the DC voltage-power response characteristics of the DC load, and the leading-lag damping link is used to improve the dynamic damping support capacity of the system, which can realize the self-synchronization operation and inertia/primary adjustment function of the load virtual synchronous machine. It has two independent control modes of inertia compensation and primary adjustment, and realizes the additional function of local load inertia compensation on the AC side of the load virtual synchronous machine by adding the local load current acquisition and control circuit on the AC side.
Description
Technical field
The present invention relates to distributed power generation microgrid control fields, virtual more particularly to a kind of load without configuring energy storage
Synchronous machine controller and method.
Background technique
By configuring energy-storage units, based on virtual synchronous generator (Virtual Synchronous Generator,
VSG) the distributed inverter of technology can simulate synchronous generator while realizing primary frequency modulation and a voltage regulation function
External characteristics, for system provide inertia, damping, reduce distributed generation resource power swing be system bring adversely affect.
The mostly concern new energy source side of research in recent years is grid-connected, weight power supply, light load, and power supply side loader is superfluous and negative
Lotus increasing option exacerbates consumption and access grid adaptability problem, and new energy power swing is brought to the stable operation of power grid
Great challenge, the flexible access control construction source-net-lotus integrated optimization system for relying on controllable burden become current new concern
Point.
Three-phase PWM Voltage Rectifier be controllable burden access power grid main device type, with its to and fro flow of power,
Unity power factor operation, low Harmonics of Input content, many advantages, such as output voltage and power are controllable, frequency control,
The fields such as uninterruptible power supply, electric car have been widely used.When Three-phase PWM Voltage Rectifier is virtually same using load
When step machine (virtual synchronous motor) control program, controllable DC load can provide inertia damping and primary tune for AC system
The beneficial effect of section.Existing load virtual synchronous machine (Load Virtual Synchronous Machine, LVSM) scheme is more
Applied in electric car charge and discharge control.For other controllable burdens, such as lighting load, motor load, electrothermal load, electricity
Resistance etc., if excess power needed for obtaining inertia damping support and Primary regulation by configuring energy-storage units, can reduce LVSM
The practical application feasibility of scheme.In addition, influenced for exchange side sudden load change to power grid bring power rush, it is existing
Virtual synchronous machine scheme does not suggest that effective control method.
Summary of the invention
In consideration of it, the present invention proposes a kind of load virtual synchronous machine control device and method without configuring energy storage, not
In the case where configuring energy-storage units, DC voltage-power response characteristic design frequency-DC voltage control of DC load is utilized
Loop, and combine motor synchronizing operation and the inertia/Primary regulation function of virtual synchronous machine core algorithm realization load virtual synchronous machine
Can, while realizing that load virtual synchronous machine exchanges side and bears with control circuit by increasing exchanges the acquisition of side load current
Lotus inertia compensation function.Specific technical solution is as follows.
A kind of load virtual synchronous machine control device and method without configuring energy storage, which is characterized in that the control dress
Set includes: main circuit, PI control electric current loop module, reactive power/voltage control module, active power and frequency control module, DC voltage control
Module, pulse width modulation module, electromagnetic equation module, power computation module, filter module, current limit module, coordinate transform mould
Block.
The main circuit respectively with the coordinate transformation module, the DC voltage control module, the pulsewidth modulation mould
Block is connected；The active power and frequency control module becomes with the DC voltage control module, the filter module, the coordinate respectively
Block is changed the mold to be connected；The reactive power/voltage control module respectively with the filter module, the power computation module, the electromagnetism side
Journey module is connected；The current limit module becomes with the power computation module, the electromagnetic equation module, the coordinate respectively
Block is changed the mold to be connected；The output of the PI control electric current loop module is connected with the pulse width modulation module.
The load virtual synchronous machine control device has 2 kinds of independent control models: inertia compensation model, Primary regulation
Mode.The control method is realized under d-q coordinate system.
The equation of DC voltage control module is under Primary regulation mode
In formula, kωFor angular frequency-DC voltage control proportionality coefficient, ωsFor grid-connected specified angular frequency, ω is the angle LVSM
Frequency, PrefFor LVSM active power reference value, UdcFor LVSM DC bus-bar voltage, UdcnFor nominal DC busbar voltage, Δ Udc
For DC bus-bar voltage regulated quantity, GPIIt (s) is the transmission function of pi regulator in DC voltage control module, ωnIt is low for second order
The natural oscillation angular frequency of bandpass filter.
The equation of reactive power/voltage control module is under Primary regulation mode
E=(Qref-Qe)kq+E0
In formula, QrefFor LVSM reactive power reference qref, QeFor LVSM reactive power average value, E is that LVSM built-in potential is effective
Value, E0For LVSM no-load emf, kqFor the proportionality coefficient of idle pressure regulation, kqtFor the integral coefficient of idle pressure regulation.
The equation of DC voltage control module is under inertia compensation model
Pref=(Udcn-Udc)GPI(s)Udc
The equation of reactive power/voltage control module is under inertia compensation model
In formula, J is virtual inertia, D1For damped coefficient,For the phase angle of LVSM built-in potential, PeFor LVSM electromagnetic power,
ω is LVSM angular frequency, D2, T be lead-lag damp link parameter.
It is oriented using LVSM built-in potential, the equation of coordinate transformation module is
In formula:ilabc=[ila, ilb, ilc]TSide is exchanged for LVSM
Local load current, iabc=[ia, ib, ic]TFor LVSM three-phase alternating current, uabc=[ua, ub, uc]TFor LVSM three-phase alternating current end
Voltage, udq=[ud, uq]T, idq=[id, iq]T, ildq=[ild, ilq]T。
Electromagnetic equation module is
I in formuladqref=[idref, iqref]TFor the current reference value of electromagnetic equation module output.
The equation of power computation module is
In formula, P is LVSM instantaneous active power, and Q is LVSM instantaneous reactive power, PlInstantaneously have for exchange side load
Function power, QlTo exchange side load instantaneous reactive power.
The equation of filter module is
In formula, PleTo exchange side load average active power, QleTo exchange side load average reactive power,
TlineFor moving average filter time constant, ωn1The harmonic wave angular frequency filtered out is needed for trapper, ζ is trapper product
Prime factor.
Pulse width modulation module is used to generate PWM modulation signal.
The load virtual synchronous machine control device main circuit structure are as follows: Three-Phase PWM Rectifier is connected by its DC bus
One or more DC loads are connect, by the local load of its ac bus connection (one or more) and access power distribution network.
The equation of current limit module is
I in formulasdqref=[isdref, isqref]TPI to obtain through clipping module controls electric current loop module references value, electric current
The i of clipping module outputsdqrefWith the i of coordinate transformation module outputdqAs the defeated of PI control electric current loop module after subtracter
Enter, PI controls the quick decoupling control that electric current loop module realizes electric current dq component using the electric current loop based on PI controller.
Exchange side load inertia compensation function can be matched under 2 kinds of control models.
After side load inertia compensation function of increasing exchanges, reactive power/voltage control module under LVSM Primary regulation mode
Equation is
E=(Qref-Qe-Qle)kq+E0
After side load inertia compensation function of increasing exchanges, reactive power/voltage control module under LVSM inertia compensation model
Equation is
After side load inertia compensation function of increasing exchanges, the equation of LVSM active power and frequency control module is
After side load inertia compensation function of increasing exchanges, the equation of LVSM current limit module is
I in formulalsdq=[ilsd, ilsq]TFor the exchange side load current after clipping.
The necessary condition that LVSM scheme of the present invention is realized is in DC load including constant-impedance load or constant current load.
The specific embodiment provided according to the present invention, the invention discloses following technical effects: being not necessarily to energy-storage units；It is not necessarily to
Phase lock circuitry；By increasing ω-UdcRatio control loop realizes the synchronization mechanism that existing virtual synchronous machine scheme has and is used to
Amount/Primary regulation function；By the increase exchanges acquisition of side load current and control circuit, to realize load virtually same simultaneously
Step machine exchanges side load inertia compensation function；LVSM control device of the invention has the characteristics that good compatibility, i.e., locally
The virtual inertia control of load can be friendly compatible with the inertia damping control of LVSM；LVSM of the present invention can automatically realize parallel connection
The power reasonable distribution of operation is convenient for dilatation.
Detailed description of the invention
Fig. 1 is the main circuit structure figure of LVSM of the present invention；
Fig. 2 is the control device structure chart of LVSM of the present invention；
Fig. 3 is DC voltage control function structure chart of the present invention；
Fig. 4 is active power and frequency control function structure chart of the present invention；
Fig. 5 is reactive power/voltage control function structure chart of the present invention；
Fig. 6 is the decision flow chart of current limit module after side load inertia compensation function of the invention of increasing exchanges.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
The load virtual synchronous machine control device and method that the object of the present invention is to provide a kind of without configuring energy storage, not
In the case where configuring energy-storage units, DC voltage-power response characteristic design frequency-DC voltage control of DC load is utilized
Loop, and combine motor synchronizing operation and the inertia/Primary regulation function of virtual synchronous machine core algorithm realization load virtual synchronous machine
Can, while realizing that load virtual synchronous machine exchanges side and bears with control circuit by increasing exchanges the acquisition of side load current
Lotus inertia compensation function.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
In Fig. 1, Three-Phase PWM Rectifier connects one or more DC loads by its DC bus, female by its exchange
The local load of line connection (one or more) simultaneously accesses power distribution network；The control device collection capacity of PWM rectifier includes: DC bus
Voltage, ac bus voltage, the alternating current of rectifier output exchange side load total current.
In Fig. 2, Fig. 3, Fig. 4, Fig. 5: kωFor angular frequency-DC voltage control proportionality coefficient, ωsFor grid-connected specified angle
Frequency, ω are LVSM angular frequency, PrefFor LVSM active power reference value, UdcFor LVSM DC bus-bar voltage, UdcnIt is specified straight
Flow busbar voltage, Δ UdcFor DC bus-bar voltage regulated quantity, D2, T be lead-lag damp link parameter, J be virtual inertia, D1
For damped coefficient, L is LVSM ac filter inductance, CdcFor LVSM DC filter capacitor, PeFor LVSM electromagnetic power, kqIt is idle
The proportionality coefficient of pressure regulation, kqiFor the integral coefficient of idle pressure regulation, QrefFor LVSM reactive power reference qref, P is LVSM instantaneous active
Power, Q are LVSM instantaneous reactive power, QeFor LVSM reactive power average value, PlTo exchange side load instantaneous active function
Rate, QlTo exchange side load instantaneous reactive power, PleTo exchange side load average active power, QleTo exchange side sheet
Ground load average reactive power, E are LVSM built-in potential virtual value, E0For LVSM no-load emf,For the phase of LVSM built-in potential
Angle, uabcFor LVSM three-phase alternating current end voltage, iabcFor LVSM three-phase alternating current, ilabcSide load electricity is exchanged for LVSM
Stream, idqrefFor the current reference value of electromagnetic equation module output.
In Fig. 6, isdqrefPI to obtain through clipping module controls electric current loop module references value, ilsdqFor the friendship after clipping
Flow side load current.
The LVSM has 2 kinds of independent control models: inertia compensation model, Primary regulation mode.LVSM is according in advance
The mode operation of setting.As switch S in Fig. 31Disconnect and Fig. 5 in switch S2When closure, LVSM runs on inertia compensation model；When
Switch S in Fig. 31Closure and Fig. 5 in switch S2When disconnection, LVSM runs on Primary regulation mode.
Exchange side load inertia compensation function can be matched under two kinds of control models.
DC load includes: lighting load, motor load, electrothermal load, resistance etc.；AC load includes: that illumination is negative
Lotus, motor load, electrothermal load, resistance sense load etc..Load is classified by port identity: constant-impedance load, and constant power load model is permanent
Current capacity.
The principle of LVSM scheme: using voltage-power characteristic of DC load, LVSM can be by controlling its direct current
Busbar voltage come control load consumption power increase and decrease；The mathematical model of SG is introduced in LVSM controller, LVSM can have
Synchronization mechanism and inertia/Primary regulation function；Since LVSM current control inner ring is enable to respond quickly the variation of given value of current value,
And power control outer loop has Inertia Characteristics, and it is slower for the response of power given value, therefore, LVSM is exchanged into side load
Positive current feedback will exchange load power negative-feedback in side to current regulator to power ring simultaneously, utilize the response of inner and outer ring
Speed difference, LVSM can provide inertia power compensation for exchange side load.
Hardware topology compares: VSG usually requires configuration energy-storage units, it is therefore an objective to provide inertia Damper Braces and one for system
Secondary frequency modulation；LVSM provides inertia Damper Braces and primary frequency modulation as system using its DC side load sheet, without configuring energy storage
Unit.
LVSM of the present invention is compared with routine VSG Controlling model: a. reactive power/voltage control model is identical；B. active power and frequency control
Model is different, and LVSM improves system dynamic antivibration enabling capabilities using lead-lag damping link, while keeping stable state wattful power
Rate controls precision；C. governor model is different, and LVSM uses ω-UdcRatio controls to realize primary frequency modulation；D.LVSM, which increases, to be handed over
Flow side feedback loading link.
LVSM participates in the adjustable active power of maximum of primary frequency modulation are as follows:
With UdcMaximum allowable offset ± 10% for, constant-impedance DC load maximum power-adjustable be 40%, constant current is straight
Stream load maximum power-adjustable is 20%, it is seen that LVSM of the present invention has considerable adjustable active power.Demonstrate this method
Correctness.
Claims (17)
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| CN110429617A (en) * | 2019-07-31 | 2019-11-08 | 上海电力大学 | Design method of direct current side capacitance inertia compensator based on frequency performance index |
| CN110797873A (en) * | 2019-07-31 | 2020-02-14 | 国网冀北电力有限公司经济技术研究院 | Hybrid micro-grid system capable of realizing power smoothing function |
| CN111987732A (en) * | 2019-05-22 | 2020-11-24 | 中国电力科学研究院有限公司 | Electric energy exchanger and method suitable for flexible interconnection of feeder lines of power distribution network |
| CN115483719A (en) * | 2022-09-20 | 2022-12-16 | 国网浙江省电力有限公司嘉兴供电公司 | An island-type pan-microgrid frequency and voltage control method |
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| CN115483719A (en) * | 2022-09-20 | 2022-12-16 | 国网浙江省电力有限公司嘉兴供电公司 | An island-type pan-microgrid frequency and voltage control method |
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