CN104810854B - Method for coordinating and controlling power between series-connected micro-grid and micro-sources of series-connected micro-grid - Google Patents
Method for coordinating and controlling power between series-connected micro-grid and micro-sources of series-connected micro-grid Download PDFInfo
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Abstract
The invention discloses a method for coordinating and controlling the power between a series-connected micro-grid and micro-sources of the series-connected micro-grid, which has two normal operating states, namely islanding and grid connecting, simultaneously. According to the structure, the overall system consists of three symmetrical subsystems of A, B and C; H-bridge micro-source inverters of the three internal symmetrical subsystems are connected together in series. Different main micro-source direct-current links are configured with energy storage systems so as to inhibit the fluctuation of the voltages of the direct-current links. In addition, the splitting/recovering operation of the micro-sources can also be realized through corresponding switching operations. According to the structure, the harmonic content of the output voltage of the system is low; the sine degree of a waveform is good; the rated working voltage level of each micro-source is low; the system construction cost is relatively low; the output frequencies and the currents of all micro-source inverters are equal to one another; the output frequency of the system is stable and the power coordination and control are relatively simple.
Description
Technical field
The present invention relates to the power coordination control technology between micro-capacitance sensor and micro- source.
Background technology
At present, micro-capacitance sensor technology has turned into solution environmental pollution, energy shortage and a large amount of distributed generation units and has concentrated
The important means of grid-connected the problems such as.Micro-capacitance sensor is developed so far, and its structure type mainly has once-through type, AC type and alternating current-direct current to mix
Three kinds of mould assembly, traditional electric power networks structure has nearly all been continued to use due to them, and internal system has circulation, harmonic wave, output electricity
The problems such as pressure is with frequency stabilization and complicated power coordination control.So far, these problems are not yet well solved.
Construction and the common issue that operating cost height is that current any structure microgrid is faced.Currently, the drop of construction cost
The low main capacity by different micro- sources, energy storage device optimizes to realize and the reduction of operating cost then relies on whole micro-grid system
Optimization operation realize, wherein the power coordination control between internal micro- source is then the important hand for realizing microgrid optimization operation
Section.
The content of the invention
It is an object of the invention to provide the power coordination control method between micro- source in a kind of tandem type micro-capacitance sensor.
The present invention is the power coordination control method between micro- source in a kind of tandem type micro-capacitance sensor, tandem type micro-capacitance sensor, by
Symmetrical A phases subsystem 1, B phases subsystem 2, C phases subsystem 3 are combined by star-like connected mode, in each phase subsystem
After one alternative electric generation unit 16, the second alternative electric generation unit 19 are respectively through AC/DC friendships-straight transform part and direct-current chain electric capacity C
It is connected to a H bridges micro-source inverter 8, the 4th H bridges micro-source inverter 11, the first DC generation unit 17, the second DC generation
Unit 18 after DC/DC DC convertings link and electric capacity C respectively through being connected to the 2nd H bridges micro-source inverter 9, the 3rd micro- source of H bridges
Inverter 10, a H bridges micro-source inverter 8, the 2nd H bridges micro-source inverter 9, the 3rd H bridges micro-source inverter 10, the 4th H bridges are micro-
Source inventer 11 is respectively through the first by-pass switch 12, the second by-pass switch 13, the 3rd by-pass switch 14, the 4th by-pass switch 15
After pass sequentially through series system connection.
Tandem type microgrid in accordance with the above, the power coordination control method between the micro- source of tandem type microgrid, its step
For：
（1）The first direct-current chain energy-storage system 20, the storage of the second direct-current chain in random micro- source are monitored in system normal course of operation
Can system 21, the state-of-charge SOC of the 3rd direct-current chain energy-storage system 22i, i=1,2,3, post analysis contrast different random micro- source
The first direct-current chain energy-storage system 20, the second direct-current chain energy-storage system 21, the SOC of the 3rd direct-current chain energy-storage system 22iBetween
Magnitude relationship；
（2）Set up random micro- source H bridges micro-source inverter modulation wave amplitude amount trimmed △ VmiWith the micro- source direct-current chain energy storage in place
System state-of-charge SOCiBetween functional relation, that is, △ Vmi=f(SOCi), it is desirable to function f (SOCi) it is monotonic increase, and
Function-output f (SOCi) meet：msetdown≤f(SOCi) ≤msetup, setting value msetdown、msetupSize is climbed by random micro- source
Ratio of slope, capacity factor determine that its span is respectively： -1< msetdown ≤0、0< msetup<1；
（3）Carry out the modulation wave amplitude fine setting operation of H bridges micro-source inverter, random micro- source correspondence H bridges micro-source inverter modulation
Ripple actual magnitude is Vmi=Vm+△Vmi, wherein VmThe common modulation ripple of the multiple H bridges micro-source inverters produced by closed-loop control
Amplitude, in addition, the micro- source correspondence H bridges micro-source inverter modulation wave amplitude of conventional auxiliary type is Vm4=Vm+△Vm4, V hereinm4 = Vm -
∑(△Vmi)；
In tandem type micro-capacitance sensor running, a constraints is implied by this power coordination control method：
∑△Vmi+△Vm4=0 ；
The present invention is advantageous in that：Pass through series connection side in tandem type microgrid between multiple H bridge micro-source inverters
Formula is coupled together, and it breaches common piconet networking mode.System output voltage harmonic content is low under the structure, waveform quality
It is good；For compared to common AC type, once-through type and alternating current-direct current hybrid microgrid, tandem type microgrid under same output voltage grade
Internal each micro- source DC-link voltage grade is low, system Construction advantage of lower cost；Each micro-source inverter output frequency, electric current phase
It is simple Deng, system output frequency stabilization and power coordination control, and the circulation problem between micro-source inverter need not be considered.Cause
This, thoroughly to solve problem present in common microgrid from structure, make the solution of problem becomes simple to tandem type microgrid.Separately
Outward, the power coordination control between micro- source in tandem type micro-capacitance sensor is realized, system operation cost can be reduced, promote the series connection system
The practical application of system.
Brief description of the drawings
Fig. 1 is tandem type micro-capacitance sensor structure chart, and Fig. 2 is A phase subsystem structure figures in tandem type micro-capacitance sensor, and Fig. 3 is this hair
The access way of micro- multiple generator units in source inside in bright three-phase series type micro-capacitance sensor, Fig. 4 is that a kind of micro-source inverter series connection connects
Direct type microgrid structure chart.
Specific embodiment
As shown in Figure 1 and Figure 2, the present invention is the power coordination control method between a kind of tandem type micro-capacitance sensor and its micro- source,
Described tandem type micro-capacitance sensor, by by symmetrical A phases subsystem 1, B phases subsystem 2, C phases subsystem 3 by star-like connected mode
Combine, in each phase subsystem the first alternative electric generation unit 16, the second alternative electric generation unit 19 hand over respectively through AC/DC-it is straight
A H bridges micro-source inverter 8, the 4th H bridges micro-source inverter 11, the first direct current are connected to after transform part and direct-current chain electric capacity C
Generator unit 17, the second DC generation unit 18 after DC/DC DC convertings link and electric capacity C respectively through being connected to the 2nd H bridges
Micro-source inverter 9, the 3rd H bridges micro-source inverter 10, a H bridges micro-source inverter 8, the 2nd H bridges micro-source inverter 9, the 3rd H bridges
Micro-source inverter 10, the 4th H bridges micro-source inverter 11 respectively through the first by-pass switch 12, the second by-pass switch the 13, the 3rd by
Series system connection is passed sequentially through after way switch 14, the 4th by-pass switch 15.
Tandem type micro-capacitance sensor in accordance with the above, the two ends of its direct-current chain electric capacity C are parallel with the first energy-storage system 20,
Two energy-storage systems 21, the 3rd energy-storage system 22, micro- source is by the first by-pass switch 12, by the second by-pass switch the 13, the 3rd in addition
Way switch 14, the 4th by-pass switch 15 carry out off-the-line/recovery operation.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, the power coordination control method between the micro- source of tandem type microgrid, its step is：
（1）The first direct-current chain energy-storage system 20, the storage of the second direct-current chain in random micro- source are monitored in system normal course of operation
Can system 21, the state-of-charge SOC of the 3rd direct-current chain energy-storage system 22i, i=1,2,3, post analysis contrast different random micro- source
The first direct-current chain energy-storage system 20, the second direct-current chain energy-storage system 21, the SOC of the 3rd direct-current chain energy-storage systemiBetween
Magnitude relationship；
（2）Set up random micro- source H bridges micro-source inverter modulation wave amplitude amount trimmed △ VmiWith the micro- source direct-current chain energy storage in place
System state-of-charge SOCiBetween functional relation, that is, △ Vmi=f(SOCi), it is desirable to function f (SOCi) it is monotonic increase, and
Function-output f (SOCi) meet：msetdown≤f(SOCi) ≤msetup, setting value msetdown、msetupSize is climbed by random micro- source
Ratio of slope, capacity factor determine that its span is respectively： -1< msetdown ≤0、0< msetup<1；
（3）Carry out the modulation wave amplitude fine setting operation of H bridges micro-source inverter, random micro- source correspondence H bridges micro-source inverter modulation
Ripple actual magnitude is Vmi=Vm+△Vmi, wherein VmThe common modulation ripple of the multiple H bridges micro-source inverters produced by closed-loop control
Amplitude, in addition, the micro- source correspondence H bridges micro-source inverter modulation wave amplitude of conventional auxiliary type is Vm4=Vm+△Vm4, V hereinm4 = Vm -
∑(△Vmi)；
In tandem type micro-capacitance sensor running, a constraints is implied by this power coordination control method：
∑△Vmi+△Vm4 =0。
As shown in figure 1, the tandem type microgrid is main by A phases subsystem 1, B phases subsystem 2, C phases subsystem 3, filtering
Device, grid-connected switch and load composition.In subsystem the first alternative electric generation unit 16, the second alternative electric generation unit 19 respectively through
AC/DC transformation of electrical energy links are connected to micro- source direct-current chain electric capacity C two ends, and alternative electric generation unit mainly has exchange wind-power electricity generation at present
Machine, miniature gas turbine, diesel-driven generator.First DC generation unit 17, the second DC generation unit 18 are by DC/DC direct currents
Transform part accesses micro- source direct-current chain electric capacity C two ends, and they are mainly including photovoltaic, fuel cell, direct current wind-driven generator etc..
As shown in Figure 1 and Figure 2, the direct-current chain electric capacity C in micro- source and a H bridges micro-source inverter 8, the 2nd H bridge micro-source inverters
9th, the 3rd H bridges micro-source inverter 10, the direct current input side of the 4th H bridges micro-source inverter 11 are connected in parallel, the micro- source inversion of a H bridges
Device 8, the 2nd H bridges micro-source inverter 9, the 3rd H bridges micro-source inverter 10, the outlet side of the 4th H bridges micro-source inverter 11 are passed through respectively
It is connected in series according to this after crossing the first by-pass switch 12, the second by-pass switch 13, the 3rd by-pass switch 14, the 4th by-pass switch 15.
Using corresponding modulator approach, voltage with multiple levels is formed after the output voltage superposition of above-mentioned H bridges micro-source inverter, then by simple
The alternating voltage of expected frequency and amplitude can be obtained after filtering.The work of the above-mentioned by-pass switch of H bridge micro-source inverter ACs
With being：Just micro- source excision/recovery operation is carried out when being broken down inside micro- source by them.
As shown in Figure 2 and Figure 3, the first direct-current chain energy-storage system 20 in random micro- source, the second direct-current chain energy-storage system 21, the
The type of three direct-current chain energy-storage systems 22 mainly has battery, super capacitor, flying wheel battery, a superconducting energy storage, or by them its
In two or more composition mixed energy storage system.Miniature gas turbine, the diesel-driven generator routine micro- source of auxiliary type are according to straight
Stream chain electric capacity C both end voltage situations of change carry out the output electric energy of real-time adjustment generator unit, to maintain direct-current chain electric capacity C two ends electricity
Pressure stabilization.Energy-storage system can be maintained when piconet island runs inside random micro- source and microgrid overall power is balanced, and realizes electricity
The stability contorting of pressure and frequency.First direct-current chain energy-storage system 20, the second direct-current chain energy-storage system 21, the 3rd direct-current chain energy storage system
The state-of-charge SOC of system 22iThe capacity in random micro- source is reflected, can be according in different micro- sources in system operation
SOCiRealize the energy compatibility scheduling between them.
Power between tandem type microgrid A phases subsystem 1, B phases subsystem 2, the inside H bridge micro-source inverters of C phases subsystem 3
Coordinate the H bridges micro-source inverter 8 of control principle the, the 2nd H bridges micro-source inverter 9, the 3rd H bridges micro-source inverter 10, the 4th H bridges
The effect of the main regulation of micro-source inverter 11 comes from the double-closed-loop control of outer voltage, current inner loop, voltage regulator the present embodiment
In employ quasi- ratio resonant controller QPR, its transmission function is expressed as：
In formula：kp、kiRespectively ratio and integral coefficient；ωc、ωoRespectively cut-off frequency and resonant frequency.
Current inner loop adjuster adoption rate controller, proportionality coefficient is kip, when tandem type piconet island runs, with reference to electricity
PressureBe given by artificially pre-setting, when it is incorporated into the power networks,Reference voltage can be by detecting line voltage
Amplitude, frequency and phase angle information and obtain, can also be worth to by the output of power outer shroud in addition.
It is obvious that in tandem type microgrid running, in order to ensure each H bridges micro-source inverter modulation wave amplitude of secondary fine setting
Influence is not produced on system output voltage, the constraints given by formula two is implied in the power coordination control method.
Above is one of implementation of the invention, for those skilled in the art, is not spending wound
In the case that the property made is worked, various changes can be carried out to above-described embodiment, can equally realize the purpose of the present invention.But it is very bright
Aobvious, this change should be included in the protection domain of claims of the present invention.
Claims (1)
1. the micro- source power control method for coordinating in a kind of tandem type micro-capacitance sensor, tandem type micro-capacitance sensor is by symmetrical A phase subsystems
（1）, B phase subsystems（2）, C phase subsystems（3）Combined by star-like connected mode, the first exchange hair in each phase subsystem
Electric unit（16）, the second alternative electric generation unit（19）Respectively through AC/DC friendships-straight transform part and direct-current chain electric capacity（C）After connect
It is connected to a H bridge micro-source inverters（8）, the 4th H bridge micro-source inverters（11）, the first DC generation unit（17）, the second direct current
Generator unit（18）Respectively through being connected to the 2nd H bridge micro-source inverters after DC/DC DC convertings link and electric capacity C（9）, the 3rd
H bridge micro-source inverters（10）, a H bridge micro-source inverters（8）, the 2nd H bridge micro-source inverters（9）, the 3rd H bridge micro-source inverters
（10）, the 4th H bridge micro-source inverters（11）Respectively through the first by-pass switch（12）, the second by-pass switch（13）, the 3rd bypass
Switch（14）, the 4th by-pass switch（15）After pass sequentially through series system connection, direct-current chain electric capacity（C）Two ends be parallel with first
Energy-storage system（20）, the second energy-storage system（21）, the 3rd energy-storage system（22）, micro- source is by the first by-pass switch in addition（12）、
Second by-pass switch（13）, the 3rd by-pass switch（14）, the 4th by-pass switch（15）Off-the-line/recovery operation is carried out, for series connection
Power coordination control method between the micro- source of type micro-capacitance sensor, it is characterised in that its step is：
（1）The first direct-current chain energy-storage system in random micro- source is monitored in system normal course of operation（20）, the second direct-current chain energy storage
System（21）, the 3rd direct-current chain energy-storage system（22）State-of-charge SOCi, i=1,2,3, post analysis contrast different random it is micro-
The first direct-current chain energy-storage system in source（20）, the second direct-current chain energy-storage system（21）, the 3rd direct-current chain energy-storage system（22）'s
SOCiBetween magnitude relationship；
（2）Set up random micro- source H bridges micro-source inverter modulation wave amplitude amount trimmed △ VmiWith the micro- source direct-current chain energy-storage system in place
State-of-charge SOCiBetween functional relation, that is, △ Vmi=f(SOCi), it is desirable to function f (SOCi) it is monotonic increase, and function
Output valve f (SOCi) meet：msetdown≤f(SOCi) ≤msetup, setting value msetdown、msetupSize is climbed by random micro- source
Rate, capacity factor determine that its span is respectively： -1< msetdown ≤0、0< msetup<1；
（3）Carry out the modulation wave amplitude fine setting operation of H bridges micro-source inverter, random micro- source correspondence H bridge micro-source inverter modulating wave realities
Border amplitude is Vmi=Vm+△Vmi, wherein VmThe common modulation wave amplitude of the multiple H bridges micro-source inverters produced by closed-loop control,
In addition, the conventional micro- source correspondence H bridges micro-source inverter modulation wave amplitude of auxiliary type is Vm4=Vm+△Vm4, V hereinm4 = Vm -∑(△
Vmi)；
In tandem type micro-capacitance sensor running, a constraints is implied by this power coordination control method：
∑△Vmi+△Vm4 =0 。
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| CN104953589A (en) * | 2015-06-08 | 2015-09-30 | 兰州理工大学 | Combined three-phase microgrid system with serially-connected microsource inverters |
| CN105186562B (en) * | 2015-09-07 | 2018-02-16 | 中国农业大学 | A kind of microgrid group of large-scale distributed power supply and its control method |
| CN105743091B (en) * | 2016-04-08 | 2018-06-26 | 天津大学 | A kind of double close-loop decoupling control method of Active Power Filter-APF |
| CN107834602B (en) * | 2017-11-23 | 2021-05-18 | 兰州理工大学 | Micro-grid system with micro-source half-bridge converter connected in series |
| CN110783965B (en) * | 2019-11-15 | 2023-03-03 | 兰州理工大学 | Micro-source power coordination method suitable for micro-grid with MMC half-bridge series structure |
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