CN107069820A - Distribution type renewable energy electricity generation grid-connecting power swing control system and control method - Google Patents

Distribution type renewable energy electricity generation grid-connecting power swing control system and control method Download PDF

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Publication number
CN107069820A
CN107069820A CN201710328554.8A CN201710328554A CN107069820A CN 107069820 A CN107069820 A CN 107069820A CN 201710328554 A CN201710328554 A CN 201710328554A CN 107069820 A CN107069820 A CN 107069820A
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power
renewable energy
voltage
grid
distribution type
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CN107069820B (en
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同向前
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Xian University of Technology
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Xian University of Technology
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24Arrangements for preventing or reducing oscillations of power in networks

Abstract

The invention discloses a kind of distribution type renewable energy electricity generation grid-connecting power swing control method, using distribution type renewable energy electricity generation grid-connecting power swing control system, including renewable energy power generation equipment, generating converter, lithium ion super capacitor, combining inverter and power network, lithium ion super capacitor is directly parallel to the dc bus of combining inverter, specifically implements according to following steps:Detection calculates the power of renewable energy power generation output, filtering process obtains its wave component, calculate the servo-actuated component for obtaining DC voltage, this servo-actuated component is added in DC voltage setting value and is used as the direct voltage reference value of combining inverter, after the processing of PI controllers, the PWM ripples of certain dutycycle are obtained, switch tube carries out break-make control, the effectively fluctuation of control renewable energy source power power, reaches the effect of smooth grid-connected power.Lithium ion super capacitor has the features such as specific power is high, specific energy is higher, while eliminating an energy storage converter.

Description

Distribution type renewable energy electricity generation grid-connecting power swing control system and control method
Technical field
Generated electricity by way of merging two or more grid systems technical field the invention belongs to distribution type renewable energy, be related to a kind of distribution type renewable energy hair The grid-connected power swing control system of electricity, the invention further relates to carry out distribution type renewable energy using above-mentioned control system to generate electricity simultaneously The method of net power swing control.
Background technology
Wind-power electricity generation and solar power generation are due to non-environmental-pollution, and potentiality to be exploited is huge, belong to the regeneration of sustainable development The features such as energy, have become the basis of human future energy supply system, but distribution type renewable energy generate electricity have it is scattered, The features such as power random fluctuation, the access of substantial amounts of distributed power source is produced greatly to the safe and stable operation of distribution system The problem of influence, fluctuation and flickering for causing line voltage, becomes increasingly conspicuous.
At present, the research controlled on renewable energy power generation power swing is concentrated mainly on the optimization of additional energy storage device Configuration and the Power Control of energy storage converter, this control mode are mainly taken outside renewable energy source power inverter Additional energy storage converts facility, does not make full use of the ability of regulation and control of combining inverter itself, the energy storage device used is also with two Based on primary cell and double electric layers supercapacitor.The discharge and recharge number of times of secondary cell is limited, and double electric layers supercapacitor energy is close Degree is low, it is difficult to the need for meeting power swing control application.Therefore, a kind of distribution type renewable energy electricity generation grid-connecting power is studied Effective control method of fluctuation seems very necessary.
The content of the invention
It is an object of the invention to provide a kind of distribution type renewable energy electricity generation grid-connecting power swing control system, solve existing There is the grid-connected power swing of technology big and the problem of network electric energy quality is low.
It is a further object of the present invention to provide a kind of distribution type renewable energy electricity generation grid-connecting power swing control method.
The technical solution adopted in the present invention is that a kind of distribution type renewable energy electricity generation grid-connecting power swing control is System, including renewable energy power generation equipment, the output end of renewable energy power generation equipment are connected with generating converter, and generate electricity conversion The output end of device is connected in parallel to lithium ion super capacitor, and lithium ion super capacitor is also connected in combining inverter in parallel On dc bus, the output end of combining inverter is connected with power network.
The features of the present invention is also resided in,
Generating converter is DC-DC converter or AC-DC converter.
Combining inverter uses single-phase or three-phase voltage source converter circuit.
Another technical scheme of the present invention is that a kind of distribution type renewable energy electricity generation grid-connecting power swing is controlled Method, using distribution type renewable energy electricity generation grid-connecting power swing control system, is generated electricity simultaneously based on distribution type renewable energy The servo antrol of net inverter direct-current voltage, specifically implements according to following steps:
Step 1:By lithium ion super capacitor both end voltage udcWith generating converter output current idc, obtain renewable Energy generated output PRE, renewable energy power generation power PRERenewable energy power generation power is obtained after low pass filter LPF Stationary componentsAccording toObtain the wave component of renewable energy power generation power
Step 2:The wave component for the renewable energy power generation power that step 1 is obtainedBy
Calculating obtains DC voltage and is servo-actuated component
Step 3:The DC voltage that step 2 is obtained is servo-actuated componentThe DC voltage setting value that is added to udc.setOn, make For the reference value u of combining inverter DC voltagedc.ref, i.e.,
Step 4:The direct voltage reference value u obtained using step 3dc.refThe lithium ion super capacitor obtained with step 1 Both end voltage udc, obtain direct current voltage error Δ udc, DC current is obtained after sequentially passing through voltage PI controllers, amplitude limiting processing Set-point idc.ref, DC current set-point idc.refSequentially pass through after electric current PI controllers, amplitude limiting processing, carry out carrier wave ratio compared with, The PWM ripples of certain dutycycle are obtained, break-make control is carried out to corresponding switching tube.
The features of the present invention is also resided in,
The stationary components of renewable energy power generation power in step 1It should be equal to and expect grid-connected power.
The wave component of renewable energy power generation power in step 1The discharge and recharge of lithium ion super capacitor should be equal to Power PLIC
The beneficial effects of the invention are as follows:Distribution type renewable energy electricity generation grid-connecting power swing control system of the present invention includes Renewable energy power generation equipment, generating converter, lithium ion super capacitor LIC, combining inverter and power network, lithium ion surpass Level capacitor is directly parallel on the dc bus of combining inverter, and renewable energy is used as using lithium ion super capacitor LIC The direct current support capacitor and energy storage device of source electricity generation grid-connecting inverter, lithium ion super capacitor LIC have specific power height, ratio Energy is higher, have extended cycle life, the features such as rapid charging performance is good, and on the basis of conventional Super capacitor specific characteristics are kept, one Determine to compensate for the low density shortcoming of super capacitor energy in degree, have a good application prospect.
By the distribution type renewable energy electricity generation grid-connecting power swing control method of step 1 to step 4, by renewable energy The fluctuation of source generated output and the fluctuation of combining inverter DC voltage are connected, by changing direct voltage reference value come between The charge and discharge process of control lithium ion super capacitor is connect, so that the fluctuation of renewable energy source power power is had Effect control, reaches the purpose of smooth grid-connected power, and operation principle is clear, and realization is simple, and the stability of a system is good.
Brief description of the drawings
Fig. 1 is the circuit block diagram of control system of the present invention;
Fig. 2 is control method principle assumption diagram of the present invention;
Fig. 3 is the photovoltaic generation analogous diagram of control method of the present invention.
1. renewable energy power generation equipment, 2. generating converters, 3. lithium ion super capacitors, 4. combining inverters, 5. Power network.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
A kind of distribution type renewable energy electricity generation grid-connecting power swing control system of the present invention, as shown in figure 1, including can be again Raw energy generating equipment 1, the output end of renewable energy power generation equipment 1 is connected with generating converter 2, generating converter 2 it is defeated Go out end and be connected in parallel to lithium ion super capacitor 3, lithium ion super capacitor 3 is also connected in the straight of combining inverter 4 in parallel Flow on bus, the output end of combining inverter 4 is connected with power network 5, and wind energy or luminous energy are converted into by renewable energy power generation equipment 1 Electric energy, then the AC or DC output voltage of renewable energy power generation equipment 1 transformed into combining inverter by generating converter 2 DC voltage needed for 4, while the MPPT maximum power point tracking control of renewable energy power generation is realized, all the time can with peak power The charge transport that renewable source of energy generation equipment 1 is exported is to DC side, and DC side lithium ion super capacitor 3 plays DC voltage branch Support is acted on and renewable energy power generation power P is compensated using its charging and discharging capabilitiesREFluctuation, generating converter 2 export work( The charge-discharge electric power P of rate and lithium ion super capacitor 3LICIt is superimposed and power network is output to by combining inverter 4.
A kind of distribution type renewable energy electricity generation grid-connecting power swing control method of the present invention, as shown in Fig. 2 using distribution Formula renewable energy source power power swing control system, based on distribution type renewable energy electricity generation grid-connecting inverter direct current The servo antrol of pressure, realizes the suppression of grid-connected power swing, specifically implements according to following steps:
Step 1:By the both end voltage u of lithium ion super capacitor 3dcWith the output current i of generating converter 2dc, obtaining can be again Raw energy generated output PRE, renewable energy power generation power PRERenewable energy power generation work(is obtained after low pass filter LPF The stationary components of rateAccording toObtain the wave component of renewable energy power generation powerAnd can The stationary components of renewable source of energy generation powerIt should be equal to and expect grid-connected power, the wave component of renewable energy power generation powerThe charge-discharge electric power P of lithium ion super capacitor should be equal toLIC
Step 2:The wave component for the renewable energy power generation power that step 1 is obtainedBy
Calculating obtains DC voltage and is servo-actuated component
Step 3:The DC voltage that step 2 is obtained is servo-actuated componentThe DC voltage setting value that is added to udcsetOn, as The reference value u of combining inverter DC voltagedcref, i.e.,
Step 4:The direct voltage reference value u obtained using step 3dc.refThe lithium ion super capacitor obtained with step 1 Both end voltage udc, obtain direct current voltage error Δ udc, DC current is obtained after sequentially passing through voltage PI controllers, amplitude limiting processing Set-point idc.ref, DC current set-point idc.refSequentially pass through after electric current PI controllers, amplitude limiting processing, carry out carrier wave ratio compared with, The PWM ripples of certain dutycycle are obtained, break-make control is carried out to corresponding switching tube.Ignoring the loss of converters In the case of, then renewable energy power generation powerThe charge-discharge electric power P of lithium ion super capacitor 3LICWith exchange grid-connected power PacThere is following relation:
Pac=PRE+PLIC
Renewable energy power generation power PREThe characteristics of with random fluctuation.The renewable energy power generation power P of fluctuationREPoint Solve as stationary componentsAnd wave componentI.e.
To realize renewable energy source power power smooth, controlling grid-connected power swing, the then expectation of combining inverter Grid-connected power should be equal to the stationary components of renewable energy power generation powerAnd the charge-discharge electric power of lithium ion super capacitor 3 PLICThe wave component of renewable energy power generation power should be equal to
As shown in figure 3, the photovoltaic generation obtained using distribution type renewable energy electricity generation grid-connecting power swing control method Analogous diagram.It is not use above-mentioned electricity generation grid-connecting power swing control method if illumination is fluctuated in sinusoidal rule, before 2min The curve obtained, although photovoltaic power PREWith sinusoidal waveform fluctuation, but the DC voltage u of combining inverterdcIt is steady Setting value 800V is scheduled on, grid-connected power P is exchangedacFollow photovoltaic power PREChange and fluctuate;After 2min, parallel network reverse Device uses above-mentioned grid-connected power swing control method, with photovoltaic power PREWith sinusoidal waveform fluctuation, combining inverter DC voltage udcChange is followed up and down in setting value 800V, by the charge and discharge process to lithium ion super capacitor LIC, Realize the grid-connected power P of exchangeacIt is smooth, eliminate the grid-connected power swing shadow that photovoltaic generation power is brought in direct grid-connected Ring.

Claims (6)

1. a kind of distribution type renewable energy electricity generation grid-connecting power swing control system, it is characterised in that including regenerative resource Generating equipment (1), the output end of renewable energy power generation equipment (1) is connected with generating converter (2), generating converter (2) Output end is connected in parallel to lithium ion super capacitor (3), and lithium ion super capacitor (3) is also connected in combining inverter in parallel (4) on dc bus, the output end of combining inverter (4) is connected with power network (5).
2. a kind of distribution type renewable energy electricity generation grid-connecting power swing control system according to claim 1, its feature It is, the generating converter (2) is DC-DC converter or AC-DC converter.
3. a kind of distribution type renewable energy electricity generation grid-connecting power swing control system according to claim 1, its feature It is, the combining inverter (4) uses single-phase or three-phase voltage source converter circuit.
4. a kind of distribution type renewable energy electricity generation grid-connecting power swing control method, it is characterised in that can be again using distribution Raw energy electricity generation grid-connecting power swing control system, based on distribution type renewable energy electricity generation grid-connecting inverter direct-current voltage with Dynamic control, specifically implements according to following steps:
Step 1:By lithium ion super capacitor (3) both end voltage udcWith generating converter (2) output current idc, obtain renewable Energy generated output PRE, renewable energy power generation power PRERenewable energy power generation power is obtained after low pass filter LPF Stationary componentsAccording toObtain the wave component of renewable energy power generation power
Step 2:The wave component for the renewable energy power generation power that step 1 is obtainedBy
<mrow> <msub> <mover> <mi>u</mi> <mo>~</mo> </mover> <mrow> <mi>d</mi> <mi>c</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mrow> <msub> <mi>Cu</mi> <mrow> <mi>d</mi> <mi>c</mi> </mrow> </msub> </mrow> </mfrac> <mo>&amp;Integral;</mo> <msub> <mover> <mi>P</mi> <mo>~</mo> </mover> <mrow> <mi>R</mi> <mi>E</mi> </mrow> </msub> <mi>d</mi> <mi>t</mi> </mrow>
Calculating obtains DC voltage and is servo-actuated component
Step 3:The DC voltage that step 2 is obtained is servo-actuated componentThe DC voltage setting value that is added to udc.setOn, as grid-connected The reference value u of inverter (4) DC voltagedc.ref, i.e.,
Step 4:The direct voltage reference value u obtained using step 3dc.refThe lithium ion super capacitor two ends obtained with step 1 Voltage udc, obtain direct current voltage error Δ udc, sequentially pass through obtained after voltage PI controllers, amplitude limiting processing DC current give Value idc.ref, DC current set-point idc.refSequentially pass through after electric current PI controllers, amplitude limiting processing, carry out carrier wave ratio compared with obtaining The PWM ripples of certain dutycycle, break-make control is carried out to corresponding switching tube.
5. a kind of distribution type renewable energy electricity generation grid-connecting power swing control method according to claim 1, its feature It is, the stationary components P of renewable energy power generation power in the step 1REThe grid-connected work(of expectation of combining inverter (4) should be equal to Rate.
6. a kind of distribution type renewable energy electricity generation grid-connecting power swing control method according to claim 1, its feature It is, the wave component of renewable energy power generation power in the step 1Lithium ion super capacitor (3) charge and discharge should be equal to Electrical power PLIC
CN201710328554.8A 2017-05-11 2017-05-11 Distributed renewable energy power generation grid-connected power fluctuation control system and control method Active CN107069820B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111969644A (en) * 2020-07-15 2020-11-20 国网湖北省电力有限公司电力科学研究院 Rotor side direct current feedforward control method for double-fed fan direct current capacitance voltage fluctuation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102244391A (en) * 2011-07-12 2011-11-16 华北电力大学 Energy storage grid-connected circuit based on lithium batteries and super capacitor and control method thereof
JP2015233384A (en) * 2014-06-10 2015-12-24 大阪瓦斯株式会社 Power demand and supply system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102244391A (en) * 2011-07-12 2011-11-16 华北电力大学 Energy storage grid-connected circuit based on lithium batteries and super capacitor and control method thereof
JP2015233384A (en) * 2014-06-10 2015-12-24 大阪瓦斯株式会社 Power demand and supply system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111969644A (en) * 2020-07-15 2020-11-20 国网湖北省电力有限公司电力科学研究院 Rotor side direct current feedforward control method for double-fed fan direct current capacitance voltage fluctuation

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