CN106849141A - A kind of Large Copacity centralization virtual synchronous machine control method, apparatus and system - Google Patents
A kind of Large Copacity centralization virtual synchronous machine control method, apparatus and system Download PDFInfo
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- CN106849141A CN106849141A CN201610981453.6A CN201610981453A CN106849141A CN 106849141 A CN106849141 A CN 106849141A CN 201610981453 A CN201610981453 A CN 201610981453A CN 106849141 A CN106849141 A CN 106849141A
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of Large Copacity centralization virtual synchronous machine control method, apparatus and system, wherein Large Copacity centralization virtual synchronous machine system includes n group energy-storage battery groups, n roads DC/DC circuits, n roads DC/AC circuits, each energy-storage battery group is sequentially connected corresponding DC/DC circuits and DC/AC circuits, the DC side parallel connection dc bus of DC/AC circuits, the AC of DC/AC circuits is in parallel to access transformer, the AC of the DC/AC circuits is connected with n roads filter circuit, solve the problems, such as that the SOC balance of Large Copacity energy-storage battery is controlled by the said process present invention more difficult.
Description
Technical field
The invention belongs to electrical engineering field, more particularly to a kind of Large Copacity centralization virtual synchronous machine control method, dress
Put and system.
Background technology
At present, the wind-power electricity generation of China, the installation scale of photovoltaic generation have occupied the first in the world, and keep sending out at a high speed
Exhibition.But compared with the synchronous generators such as traditional thermoelectricity, there is power intervals, randomness ripple in wind-power electricity generation, photovoltaic generation etc.
Dynamic the problems such as, and do not possess power oscillation damping, inertia frequency modulation, the ability from main pressure regulator, after extensive access power network, by shadow
Ring the voltage/frequency stability of power network.
For the problem, the work(of fluctuation can be stabilized by increasing Large Copacity centralization energy storage in wind-powered electricity generation, photovoltaic station
Rate.Limited by energy-storage battery and its battery management system (BMS) technology, it is impossible to realize the direct parallel connection of high capacity cell, thus it is existing
Some Large Copacity energy-accumulating power stations are typically all the connection that energy-storage battery and power network are realized by multiple pc S, and every PCS connection is corresponding
The energy-storage battery of capacity, realizes the SOC controls of battery.Each PCS receives the instruction of backstage scheduling, is absorbed from power network or to power network
Delivered power.When capacity is larger, due to energy-storage battery and the difference of each PCS, the response time there is also difference, so that can not
As an entirety for coordination.
Use for reference the operation external characteristics of conventional synchronization generating set, the electronic power conversion based on virtual synchronous generator algorithm
Device control strategy turns into a current study hotspot, and it combines energy-storage system, current transformer is exported closely synchronized generator
External characteristics.Energy-storage system in extensive intermittent new energy station accesses power network using virtual synchronous machine technology, and one is energy
Enough it is actively engaged in primary frequency modulation, pressure regulation, there is provided certain active and reactive power support；Two is that can provide inertia damping, effectively suppression
Hunting of frequency processed.Using virtual synchronous machine technology, intermittent new energy can be made to generate electricity and to possess close with conventional synchronous generating set
External characteristics.
The content of the invention
It is an object of the invention to provide a kind of Large Copacity centralization virtual synchronous machine control method, apparatus and system, use
It is more difficult in the SOC balance control ratio for solving the problems, such as Large Copacity energy-storage battery.
To achieve the above object, the technical scheme is that：
A kind of Large Copacity centralization virtual synchronous machine control method, the method is comprised the following steps：
Step 1)：The SOC of collection DC bus-bar voltage and each energy-storage battery group；
Step 2)：Set the droop control curve of DC current-DC bus-bar voltage, i.e. I-U droop controls curve；
Step 3)：It is bent with reference to the I-U droop controls according to the SOC of each energy-storage battery group, and DC bus-bar voltage
Line, calculates the instruction current of DC/DC circuits, and control DC/DC circuits are exported by the instruction current；Wherein by each energy-storage battery group
SOC the instruction current of DC/DC circuits is compensated, the balance degree between compensation rate and each energy-storage battery group SOC is relevant；
Step 4)：The mechanical model and electromagnetic model of virtual synchronous generator are set up, DC/AC circuit outputs are controlled.
The I-U droop controls curve is：
Wherein, ijrefIt is instruction current, UdcIt is the DC bus-bar voltage of collection, I1j、I2jIt is the instruction electricity of DC/DC circuits
Stream perunit value.
The instruction current perunit value I of the DC/DC circuits1j、I2jFor：
Wherein：SOCjIt is j-th SOC, SOC of DC/DC circuits correspondence energy-storage batterymaxIt is each energy-storage battery in system
SOC maximum, SOCminIt is the minimum value of the SOC of each energy-storage battery in system, Δ SOC=SOCmax-SOCmin。
Present invention also offers a kind of Large Copacity centralization virtual synchronous machine control device, the device includes：
Collecting unit：SOC for gathering DC bus-bar voltage and each energy-storage battery group；
Setup unit：Droop control curve for setting DC current-DC bus-bar voltage, i.e. I-U droop controls are bent
Line；
Computing unit：For the SOC according to each energy-storage battery group, and DC bus-bar voltage, with reference to the sagging controls of the I-U
Koji-making line, calculates the instruction current of DC/DC circuits, and control DC/DC circuits are exported by the instruction current；Wherein by each energy storage electricity
The SOC of pond group is compensated to the instruction current of DC/DC circuits, the balance degree between compensation rate and each energy-storage battery group SOC
It is relevant；
Set up unit：Mechanical model and electromagnetic model for setting up virtual synchronous generator, control DC/AC circuits are defeated
Go out.
The I-U droop controls curve is：
Wherein, ijrefIt is instruction current, UdcIt is the DC bus-bar voltage of collection, I1j、I2jIt is the instruction electricity of DC/DC circuits
Stream perunit value.
The instruction current perunit value I of the DC/DC circuits1j, I2jFor：
Wherein, SOCjIt is j-th SOC, SOC of DC/DC circuits correspondence energy-storage batterymaxIt is each energy-storage battery in system
SOC maximum, SOCminIt is the minimum value of the SOC of each energy-storage battery in system, Δ SOC=SOCmax-SOCmin。
Present invention also offers a kind of Large Copacity centralization virtual synchronous machine control system, including n group energy-storage battery groups, n
Road DC/DC circuits, n roads DC/AC circuits, each energy-storage battery group is sequentially connected corresponding DC/DC circuits and DC/AC circuits, DC/
The DC side parallel connection dc bus of AC circuits, the AC of DC/AC circuits is in parallel to access transformer.
The AC of the DC/AC circuits is connected with n roads filter circuit.
The beneficial effects of the invention are as follows：
The present invention controls DC bus-bar voltage using droop control, and sagging curve is again dynamic according to energy-storage battery SOC states
State adjusts to realize the SOC balance of each energy-storage battery unit.
The method of the present invention can realize larger system power.
The present invention realizes the access of Large Copacity energy-storage battery using two-stage topologies, and prime is using multichannel DC/DC electricity
Road, can avoid single energy storage battery system parallel connection capacity excessive, and rear class uses multichannel DC/AC circuits, achievable virtual synchronous hair
Electric motors function, strengthens the stability of power system.
Brief description of the drawings
Fig. 1 is the topology diagram of Large Copacity centralization virtual synchronous machine；
Fig. 2 is the SOC balance droop control curve map of Large Copacity centralization virtual synchronous machine；
Fig. 3 is each voltage distribution graph in sagging curve；
Fig. 4 is the generation method figure of virtual synchronous generator model and instruction current.
Specific embodiment
A kind of Large Copacity centralization virtual synchronous machine control system, including n group energy-storage battery groups, n roads DC/DC circuits, n roads
DC/AC circuits, each energy-storage battery group is sequentially connected corresponding DC/DC circuits and DC/AC circuits, the DC side of DC/AC circuits
Dc bus is connected in parallel, the AC of DC/AC circuits is in parallel to access transformer, and the AC of DC/AC circuits is connected with the filter of n roads
Ripple loop.
Specifically, as shown in figure 1, using two-stage topologies, power system capacity is 5MW, prime using 10 road DC/DC electricity
Road is connected with the battery of matching, is limited by battery capacity, and single DC/DC power is 500kW, can avoid single energy storage battery system
Capacity in parallel is excessive, and circuit output side is directly in parallel；Rear class uses the DC/AC circuits of 4 road 1.25MW, and AC is directly after parallel connection
By 690:35000 transformer accesses power network, is capable of achieving larger capacity.
The characteristics of this topological structure is to include multichannel DC/DC circuits and multichannel DC/AC circuits, i.e., the present invention is applied to multichannel
The situation of control, the comparing of particularly multichannel DC/DC circuits application is more, if other kinds of topological structure, as long as including many
Road DC/DC circuits, can use the method for the present invention.
The virtual synchronous machine control method of a kind of Large Copacity energy storage, for each DC/DC circuit as shown in Figure 1 and DC/
AC circuits are controlled, and include the step of the control method：
For any one DC/DC circuit, including step 1)：The SOC of collection DC bus-bar voltage and each energy-storage battery group；
Step 2)：Set the droop control curve of DC current-DC bus-bar voltage, i.e. I-U droop controls curve；
Step 3)：It is bent with reference to the I-U droop controls according to the SOC of each energy-storage battery group, and DC bus-bar voltage
Line, calculates the instruction current of DC/DC circuits, and control DC/DC circuits are exported by the instruction current；Wherein by each energy-storage battery group
SOC the instruction current of DC/DC circuits is compensated, the balance degree between compensation rate and each energy-storage battery group SOC is relevant；
For DC/AC circuits, including step 4)：The mechanical model and electromagnetic model of virtual synchronous generator are set up, is controlled
DC/AC circuit outputs.
The control method is comprised the following steps that：
Step 2) in, the curve for calculating is as shown in Fig. 2 I>It is that energy-storage battery outwards discharges when 0；I<It is to storage when 0
Can battery charging.UL、UHRespectively under-voltage and the overvoltage protection value, U of DC bus-bar voltage1~U2Interval is energy-storage battery charging
It is interval；U3~U4Interval is energy-storage battery discharge range；U2~U3Area is electrocuted in interval for energy-storage battery discharge and recharge, interval interior herein
Neither charge nor discharge.U1、U2、U3、U4、UL、UHValue according to real system requirement determine.
Step 3) in, charging/discharging current instruction ijrefDetermined by following formula：
Wherein UdcIt is the DC bus-bar voltage of collection.
The instruction current I1jAnd I2jIt is (j=1~n1, n1It is prime DC/DC circuits number) current-order of energy-storage battery
Perunit value, I1jAnd I2jValue determined by following formula：
Wherein, SOCjIt is j-th SOC, SOC of DC/DC circuits correspondence energy-storage batterymaxIt is each energy-storage battery in system
SOC maximum, SOCminIt is the minimum value of the SOC of each energy-storage battery in system, Δ SOC=SOCmax-SOCmin, expression
When Δ SOC × 10 can make energy-storage battery discharge and recharge in formula the difference control of maximum current and minimum current 10% it is specified with
It is interior, to ensure the input-output power of system.
According to AC power network 690V line voltages, with reference to the voltage class of switching device, can be by the voltage in sagging curve
It is defined as shown in Figure 3.
The characteristics of above-mentioned control method is to increase SOC balance on the basis of droop control, and the means of use are to make SOC
For compensation rate is compensated droop control.In above embodiment, what is be given is that a kind of droop control of specific, segmented is bent
Line, as other embodiment, it would however also be possible to employ other kinds of droop control curve.Specifically compensation formula isAs other embodiment, it would however also be possible to employ embody
The different formula of SOC balance degree compensates current-order perunit value I1jAnd I2j。
Step 4) in, the mechanical model of virtual synchronous motor is expressed as：
Wherein, J is the rotary inertia of virtual synchronous generator, ω0It is synchronized angular speed, Tm、Te、TdIt is respectively empty
Intend machinery, electromagnetism and the damping torque of synchronous machine, D is damped coefficient.
Electromagnetic model is：
Wherein, eabcIt is virtual synchronous machine threephase armature potential, uabcIt is stator terminal voltage, iabcIt is armature supply, R is same
Step resistance, L is synchronous reactance.
According to the mechanical model and electromagnetic model of virtual synchronous motor, DC/AC circuits are gone out according to Structure Calculation shown in Fig. 3
Instruction current, DC/AC circuit outputs are controlled according to instruction current, realize virtual synchronous electric motors function.
Belong to prior art due to virtual synchronous machine is used for into DC/AC controls, also there are many different controls in the prior art
Form processed, therefore the present invention only introduces the principle of Synchronization Control, as shown in figure 4, no longer specifically giving control block diagram and controlling
Journey, those skilled in the art can realize synchronous machine control using various control modes of the prior art.
Present invention also offers a kind of Large Copacity centralization virtual synchronous machine control device, the device include collecting unit,
Setup unit, computing unit and unit is set up, wherein collecting unit is used to gathering DC bus-bar voltage and each energy-storage battery group
SOC；Setup unit is used to set the droop control curve of DC current-DC bus-bar voltage, i.e. I-U droop controls curve；Meter
Unit is calculated for the SOC according to each energy-storage battery group, and DC bus-bar voltage, with reference to the I-U droop controls curve, is calculated
The instruction current of DC/DC circuits, control DC/DC circuits are exported by the instruction current；Wherein by SOC pairs of each energy-storage battery group
The instruction current of DC/DC circuits is compensated, and the balance degree between compensation rate and each energy-storage battery group SOC is relevant；Set up single
Unit is used to set up the mechanical model and electromagnetic model of virtual synchronous generator, controls DC/AC circuit outputs.
Above-mentioned control device, actually a kind of software architecture, the step of wherein each unit is with above-mentioned control method
1) -4) corresponding process or program.Therefore, no longer the control device is described in detail.
Above-mentioned control device runs as a kind of program in virtual synchronous generator, and using droop control come stabilization
DC bus-bar voltage, sagging curve SOC states again according to energy-storage battery dynamically adjust to realize each energy-storage battery unit
SOC balance, and the larger power of system can be realized, connecing for Large Copacity energy-storage battery is realized using two-stage topologies
Enter, prime uses multichannel DC/DC circuits, can avoid that single energy storage battery system parallel connection capacity is excessive, rear class uses multichannel DC/AC
Circuit, is capable of achieving virtual synchronous generator function.
Claims (8)
1. a kind of Large Copacity centralization virtual synchronous machine control method, for n roads DC/DC circuits, one is corresponded to per road DC/DC circuits
Individual energy-storage battery group, it is characterised in that the method is comprised the following steps：
Step 1)：The SOC of collection DC bus-bar voltage and each energy-storage battery group；
Step 2)：Set the droop control curve of DC current-DC bus-bar voltage, i.e. I-U droop controls curve；
Step 3)：According to the SOC of each energy-storage battery group, and DC bus-bar voltage, with reference to the I-U droop controls curve, meter
The instruction current of DC/DC circuits is calculated, control DC/DC circuits are exported by the instruction current；Wherein by the SOC of each energy-storage battery group
Instruction current to DC/DC circuits is compensated, and the balance degree between compensation rate and each energy-storage battery group SOC is relevant；
Step 4)：The mechanical model and electromagnetic model of virtual synchronous generator are set up, DC/AC circuit outputs are controlled.
2. a kind of Large Copacity centralization virtual synchronous machine control method according to claim 1, it is characterised in that the I-
U droop control curves are：
Wherein, ijrefIt is instruction current, UdcIt is the DC bus-bar voltage of collection, I1j、I2jIt is the instruction current perunit of DC/DC circuits
Value.
3. a kind of Large Copacity centralization virtual synchronous machine control method according to claim 2, it is characterised in that described
The instruction current perunit value I of DC/DC circuits1j、I2jFor：
Wherein, SOCjIt is j-th SOC, SOC of DC/DC circuits correspondence energy-storage batterymaxIt is the SOC of each energy-storage battery in system
Maximum, SOCminIt is the minimum value of the SOC of each energy-storage battery in system, Δ SOC=SOCmax-SOCmin。
4. a kind of Large Copacity centralization virtual synchronous machine control device, for n roads DC/DC circuits, one is corresponded to per road DC/DC circuits
Individual energy-storage battery group, it is characterised in that the device includes：
Collecting unit：SOC for gathering DC bus-bar voltage and each energy-storage battery group；
Setup unit：Droop control curve for setting DC current-DC bus-bar voltage, i.e. I-U droop controls curve；
Computing unit：It is bent with reference to the I-U droop controls for the SOC according to each energy-storage battery group, and DC bus-bar voltage
Line, calculates the instruction current of DC/DC circuits, and control DC/DC circuits are exported by the instruction current；Wherein by each energy-storage battery group
SOC the instruction current of DC/DC circuits is compensated, the balance degree between compensation rate and each energy-storage battery group SOC is relevant；
Set up unit：Mechanical model and electromagnetic model for setting up virtual synchronous generator, control DC/AC circuit outputs.
5. a kind of Large Copacity centralization virtual synchronous machine control device according to claim 4, it is characterised in that the I-
U droop control curves are：
Wherein, ijrefIt is instruction current, UdcIt is the DC bus-bar voltage of collection, I1j、I2jIt is the instruction current perunit of DC/DC circuits
Value.
6. a kind of Large Copacity centralization virtual synchronous machine control device according to claim 5, it is characterised in that described
The instruction current perunit value I of DC/DC circuits1j、I2jFor：
Wherein, SOCjIt is j-th SOC, SOC of DC/DC circuits correspondence energy-storage batterymaxIt is the SOC of each energy-storage battery in system
Maximum, SOCminIt is the minimum value of the SOC of each energy-storage battery in system, Δ SOC=SOCmax-SOCmin。
7. a kind of Large Copacity centralization virtual synchronous machine control system, it is characterised in that including n group energy-storage battery groups, n roads DC/
DC circuits, n roads DC/AC circuits, each energy-storage battery group is sequentially connected corresponding DC/DC circuits and DC/AC circuits, DC/AC electricity
The DC side parallel connection dc bus on road, the AC of DC/AC circuits is in parallel to access transformer.
8. a kind of Large Copacity centralization virtual synchronous machine control system according to claim 7, it is characterised in that described each
The AC of DC/AC circuits is respectively connected with n roads filter circuit.
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| CN108199390A (en) * | 2017-12-29 | 2018-06-22 | 北京国网普瑞特高压输电技术有限公司 | A kind of method and system using the control power distribution network pressure regulation of distributed energy storage system |
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| CN112600226A (en) * | 2020-11-24 | 2021-04-02 | 国网河北省电力有限公司电力科学研究院 | Configuration method, device, equipment and storage medium for energy storage capacity of new energy station |
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