CN107465192A - Mix the variable power control and DC voltage control method of microgrid - Google Patents
Mix the variable power control and DC voltage control method of microgrid Download PDFInfo
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- CN107465192A CN107465192A CN201710696333.6A CN201710696333A CN107465192A CN 107465192 A CN107465192 A CN 107465192A CN 201710696333 A CN201710696333 A CN 201710696333A CN 107465192 A CN107465192 A CN 107465192A
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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
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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Abstract
The present invention relates to a kind of variable power control for mixing microgrid with DC voltage control method, the breaker K between ac bus and dc bus by connecting2With two-way AC DC converters be connected, ac bus and bulk power grid directly pass through breaker K1Connection, AC/DC inverters device use DC voltage control；According to K1、K2Folding condition, mixing microgrid there are 4 kinds of mode of operations, when direct-current micro-grid works in island mode, direct-current micro-grid uses variable power control；When direct-current micro-grid works in grid-connect mode, photovoltaic cell is controlled using MPPT, and wind-powered electricity generation is controlled using MPPT, and battery uses constant-current charge.Variable power control and DC voltage control are combined, when being run in various mode of operations, alternating current-direct current mixing microgrid can stable operation；When change of external conditions, alternating current-direct current mixing microgrid is able to maintain that the balance of power；When switching between various mode of operations, alternating current-direct current mixing microgrid, which can be realized, to be taken over seamlessly.
Description
Technical field
The present invention relates to a kind of power control technology, more particularly to a kind of variable power control and DC voltage for mixing microgrid
Control method.
Background technology
Mixing microgrid in two-way AC DC converters most widely used control strategy be generally divided into PQ controls, droop control,
V/f controls three kinds.Wherein, the function that V/f controls are mainly realized is to maintain the stabilization of busbar voltage and frequency, therefore this control
Strategy is mainly used in when exchanging piconet island pattern and control strategy of the direct-current micro-grid as main control unit, as a rule electric power storage
Pond is as main control unit, and direct-current micro-grid is used as equivalent to fluctuation power supply and is typically controlled from control unit using PQ and then keep straight
The constant of microgrid power output is flowed, or using droop control and then to distribute the power output between each fluctuation power supply.
But in above-mentioned PQ controls, the research and simulation process of droop control, find PQ controls, droop control not
Foot part.Such as, the given active power when PQ controls, reactive power, sagging coefficient, busbar voltage, the bus frequency of droop control
During the conditions constants such as rate, keep permanent using the active power of output of PQ controls or the micro-source inverter of droop control, reactive power
Determine without being influenceed by external condition；But the power output of direct-current micro-grid is by external condition, such as intensity of illumination, temperature, wind
The influence of the environmental conditions such as speed is very big, and this is just controlled with PQ, the power output of the micro-source inverter of droop control is not by the external world
The characteristic that condition influences produces very big difference, thus for control strategy and the direct-current micro-grid association such as PQ controls, droop control
Tonality is excessively poor.
DC voltage control is a kind of less control strategy of application study in two-way AC/DC converters, and direct current is voltage-controlled
The main operational principle of system determines two-way AC/ to keep the constant of DC bus-bar voltage according to the situation of direct-current micro-grid power
The mobility status of DC inverter powers.
And because direct-current micro-grid variable power control is able to maintain that the constant of DC bus-bar voltage, therefore variable power control with
The harmony of DC voltage control is very good.
The content of the invention
The present invention be directed to mix two-way AC in microgrid DC inverter control methods and direct-current micro-grid inaccurate coordination ask
Topic, it is proposed that a kind of variable power control for mixing microgrid and DC voltage control method, variable power control is voltage-controlled with direct current
System combines, and is able to maintain that the balance of microgrid power and the stabilization of voltage.
The technical scheme is that：A kind of variable power control for mixing microgrid and DC voltage control method, exchange are female
Breaker K between line and dc bus by connecting2With two-way AC DC converters be connected, ac bus is direct with bulk power grid
Pass through breaker K1Connection, AC/DC inverters device use DC voltage control；
According to K1、K2Folding condition, mixing microgrid has 4 kinds of mode of operations, and under 4 kinds of mode of operations, control method is such as
Under：
First mode：Work as K1、K2All close, exchange microgrid is in grid-connect mode control, and direct-current micro-grid is in grid-connect mode control
System；
Second mode：K1Disconnect, K2All close, exchange microgrid is in island mode control, and direct-current micro-grid is in grid-connect mode
Control；
3rd pattern：K1Closure, K2Disconnect, direct-current micro-grid islet operation, using variable power control, exchange micro-grid connection fortune
OK；
Fourth mode：K1And K2All disconnect, direct-current micro-grid islet operation, using variable power control, exchange piconet island fortune
OK.
When the direct-current micro-grid works in grid-connect mode control, photovoltaic cell is controlled using MPPT, and wind-powered electricity generation is controlled using MPPT
System, battery use constant-current charge.
The direct-current micro-grid islet operation, using variable power control, the variable power control is various micro- with direct-current micro-grid
Source input, the power of output see the table below as microgrid switching working mode reference value, including 5 kinds of mode of operations：
In table, Pbattery_c、Pbattery_dThe respectively charge power of battery, discharge power,
The respectively maximum of battery charge power, discharge power, Ppv、Pwind、PloadPhotovoltaic, wind-powered electricity generation, load respectively in microgrid
Power, subscript max is maximum, and min is minimum value, in non-limit variable power control, by gathering photovoltaic in microgrid, wind
Electricity, load power, then calculate the set-point P of battery charge and discharge powerref-battery_c、Pref-battery_d, finally control
Battery is near set-point；In limit variable power control, when the electric current of battery charge and discharge reaches maximum, battery
Power limit Calculated by formula, along with the amendment of the voltage change caused by error,
And then make battery safety and stability works under power limit all the time.
The beneficial effects of the present invention are：The variable power control and DC voltage control method of present invention mixing microgrid,
When being run in various mode of operations, alternating current-direct current mixing microgrid can stable operation；When change of external conditions, alternating current-direct current mixing
Microgrid is able to maintain that the balance of power；When switching between various mode of operations, alternating current-direct current mixing microgrid, which can be realized, smoothly to be cut
Change.
Brief description of the drawings
Fig. 1 is the theory diagram of PQ controls；
Fig. 2 is DC voltage control theory diagram；
Fig. 3 is the structure chart of mixing microgrid；
When Fig. 4 (a) switches between pattern 1 and 2 of the present invention, DC bus-bar voltage change curve；
When Fig. 4 (b) switches between pattern 1 and 2 of the present invention, ac bus voltage change curve figure；
When Fig. 4 (c) switches between pattern 1 and 2 of the present invention, ac bus frequency variation curve figure；
When Fig. 5 (a) switches between pattern 1 and 3 of the present invention, DC bus-bar voltage change curve；
When Fig. 5 (b) switches between pattern 1 and 3 of the present invention, ac bus voltage change curve figure；
When Fig. 5 (c) switches between pattern 1 and 3 of the present invention, ac bus frequency variation curve figure；
When Fig. 6 (a) switches between pattern 1 and 4 of the present invention, DC bus-bar voltage change curve；
When Fig. 6 (b) switches between pattern 1 and 4 of the present invention, ac bus voltage change curve figure；
When Fig. 6 (c) switches between pattern 1 and 4 of the present invention, ac bus frequency variation curve figure；
When Fig. 7 (a) switches between pattern 2 and 3 of the present invention, DC bus-bar voltage change curve；
When Fig. 7 (b) switches between pattern 2 and 3 of the present invention, ac bus voltage change curve figure；
When Fig. 7 (c) switches between pattern 2 and 3 of the present invention, ac bus frequency variation curve figure；
When Fig. 8 (a) switches between pattern 2 and 4 of the present invention, DC bus-bar voltage change curve；
When Fig. 8 (b) switches between pattern 2 and 4 of the present invention, ac bus voltage change curve figure；
When Fig. 8 (c) switches between pattern 2 and 4 of the present invention, ac bus frequency variation curve figure；
When Fig. 9 (a) switches between pattern 3 and 4 of the present invention, DC bus-bar voltage change curve；
When Fig. 9 (b) switches between pattern 3 and 4 of the present invention, ac bus voltage change curve figure；
When Fig. 9 (c) switches between pattern 3 and 4 of the present invention, ac bus frequency variation curve figure.
Embodiment
DC voltage control is the control strategy of the less use of inverter control between the alternating current-direct current bus for mixing microgrid, its
Basic Topological changes according to power limitation control (i.e. PQ controls) strategy common in exchange microgrid.Controlled compared to PQ
System, DC voltage control is relatively simple for structure, and parameter is less, easily stable.PQ controls the theory diagram with DC voltage control
As shown in Figure 1, 2.
It is that inverter exports in PQ control strategies from Fig. 1,2, PQ control and the main distinction of DC voltage control
D, q axle reference value of electric current are respectively id_ref、iq_ref, they are represented by：
It follows that in Fig. 1 PQ control strategies, its power control module can be drawn by formula (1).And DC voltage control
In strategy, the reference value i of the d axis components of inverter output currentd_refIt is by DC side voltage of converter UdcWith its rated value
Udc_refDifference, drawn after PI is adjusted；Make the reference value i of the q axis components of inverter output currentq_ref=0.
In addition to above-mentioned difference, DC voltage control and other module (such as current controls, SPLL software phlase lockings of PQ controls
The modules such as ring, dq0-adc conversion, abc-dq0 conversion, SPWM modulation algorithms) it is identical.
In direct-current micro-grid, the control strategy of generally use is grading control, and the grading control principle of direct-current micro-grid is：With
DC bus-bar voltage is reference quantity, when busbar voltage is less than its rated value, illustrates that the power output in micro- source in direct-current micro-grid is small
In the power that load is consumed, it should now increase the power output in each micro- source or reduce the work(that microgrid overall load is consumed
Rate；When DC bus-bar voltage is more than its rated value, illustrate that the power output in micro- source in direct-current micro-grid is more than what load was consumed
Power, it should now reduce the power output in each micro- source.
Assuming that DC bus-bar voltage UDCStationary value be 800V, then by DC bus-bar voltage UDCBig I is classified as 6
Grade, they are respectively：1 grade, UDC<760V；2 grades, 760V≤UDC<780V；3 grades, 780V≤UDC<800V；4 grades, 800V≤UDC
<820V；5 grades, 820V≤UDC<840V；6 grades, 840V≤UDC<860V；7 grades, UDC≥860V.The busbar voltage of 6 grades determines
7 kinds of DC operation patterns, are shown in Table 1.
Table 1
Above-mentioned grading control be present, e.g., 1. during DC bus-bar voltage normal operation, its maxima and minima
Difference be Δ Udc=860V-760V, difference are excessive；2. because grading control is to determine direct current by the size of DC bus-bar voltage
The mode of operation of microgrid, thus DC bus-bar voltage small range fluctuation may result in direct-current micro-grid can be in two or more works
High frequency switches by mistake between operation mode, influences the normal operation of direct-current micro-grid.
The problem of existing for above-mentioned grading control, it is proposed that the variable power control of direct-current micro-grid, abandon female with direct current
Line voltage as microgrid switching working mode reference value, but using the various micro- sources inputs of direct-current micro-grid, output power as micro-
Net switching working mode reference value, 5 kinds of mode of operations of direct-current micro-grid are shown in Table 2.
Table 2
In table 2, Pbattery_c、Pbattery_dThe respectively charge power of battery, discharge power,
The respectively maximum of battery charge power, discharge power, Ppv、Pwind、PloadPhotovoltaic, wind-powered electricity generation, load respectively in microgrid
Power, subscript max is maximum, and min is minimum value, in non-limit variable power control, by gathering photovoltaic in microgrid, wind
Electricity, load power, then calculate the set-point P of battery charge and discharge powerref-battery_c、Pref-battery_d, finally control
Battery is near set-point；In limit variable power control, when the electric current of battery charge and discharge reaches maximum, battery
Power limitIt can be calculated by formula, along with the voltage change caused by error
Amendment, and then make battery safety and stability works under power limit all the time.
The variable power control strategy perfection that table 2 provides solves the defects of grading control.For example, 1. when direct-current micro-grid to manage
When thinking condition (not considering each micro- source power measurement error) operation, DC bus-bar voltage maintains its rated value Udc_rat=800V；
2. because Variable power is the foundation that switches using power as direct-current micro-grid mode of operation, therefore DC bus-bar voltage is to direct-current micro-grid
The switching of mode of operation is without influence.
The structure chart of mixing microgrid as shown in Figure 3, the breaker K between ac bus and dc bus by connecting2With
Two-way AC the connection of DC converters, ac bus and bulk power grid directly pass through breaker K1Connection, alternating current-direct current mixing microgrid have two
Individual breaker K1、K2.Work as K2Disconnect, during direct-current micro-grid islet operation, direct-current micro-grid uses variable power control, this control strategy
So that DC bus-bar voltage UdcMaintain its rated value Udc_rat；Work as K2During closure, by double between dc bus and ac bus
Connected to AC/DC inverters, at this moment two-way AC/DC converters use DC voltage control, and this control strategy can make direct current
Bus UdcMaintain its rated value Udc_ratOn.
If direct-current micro-grid uses DC voltage control using variable power control and AC/DC inverters device, K2It is straight during disconnection
Piconet island operation is flowed, then its DC bus-bar voltage Udc=Udc_rat；And K2During closure, direct-current micro-grid is grid-connected to exchange microgrid, double
When being run to AC/DC converters, DC bus-bar voltage Udc=Udc_rat.Therefore, K2Before and after switching, in alternating current-direct current mixing microgrid, directly
It is identical to flow busbar voltage, is equal to its rated value, and then cause K2During switching, direct-current micro-grid is reduced to the impact for exchanging microgrid
Minimum, add the stability of mixing microgrid.
According to K1、K2Folding condition, mixing microgrid has 4 kinds of mode of operations, and under 4 kinds of mode of operations, control method is such as
Under：
1) K is worked as1、K2All close, now mix microgrid and be in grid-connect mode, this pattern is the most usual work of mixing microgrid
Operation mode, and the mode of operation of mixing microgrid operation maximum probability, now exchange microgrid and are in grid-connect mode control strategy, directly
Stream microgrid is in grid-connect mode control strategy.
2)K1Disconnect, K2Closure, now mix microgrid and be in island mode, the likelihood ratio that this mode of operation occurs is diluter
It is few, now exchange microgrid and be in island mode control strategy, direct-current micro-grid is in grid-connect mode control strategy.
3)K1Closure, K2Disconnect, now mix direct current component in microgrid and disconnected with AC portion, and AC portion and big electricity
Net connection, the probability that this mode of operation occurs is also than sparser.Now the control strategy of mixing microgrid is：Direct-current micro-grid isolated island
Operation, using variable power control, exchange micro-grid connection operation.
4)K1And K2All disconnect, now mix direct current component in microgrid and disconnected with AC portion, and AC portion and big electricity
Net disconnects, and the probability that this mode of operation occurs is equally than sparser.Now the control strategy of mixing microgrid is：Direct-current micro-grid is lonely
Island operation uses variable power control, exchange piconet island operation.
Above-mentioned control strategy is as shown in table 3：
Table 3
When direct-current micro-grid works in island mode, direct-current micro-grid uses variable power control；When direct-current micro-grid works in simultaneously
During net pattern, photovoltaic cell is controlled using MPPT, and wind-powered electricity generation is controlled using MPPT, and battery uses constant-current charge, the normal work of load
Make.
According to above-mentioned control strategy, mixing microgrid is emulated, and result is as follows, when alternating current-direct current mixing microgrid is above-mentioned
When mutually switching between 4 mode of operations, DC bus-bar voltage, ac bus voltage, ac bus frequency variation curve such as Fig. 4
(a) 4 (b) 4 (c)~9 (a) 9 (b) shown in 9 (c).Known by figure, switched between the various mode of operations of wind-light storage alternating current-direct current microgrid
When, the change of DC bus-bar voltage, ac bus voltage and frequency is very smooth, does not produce huge fluctuation and harmonic wave, by
This knows, during using above-mentioned control strategy, alternating current-direct current mixing microgrid can realize stable operation, and mix each mode of operation of microgrid
Between can realize and take over seamlessly.
Claims (3)
1. a kind of variable power control for mixing microgrid and DC voltage control method, it is characterised in that ac bus is female with direct current
Pass through the breaker K of series connection between line2With two-way AC DC converters be connected, ac bus and bulk power grid directly pass through breaker K1
Connection, AC/DC inverters device use DC voltage control；
According to K1、K2Folding condition, mixing microgrid has 4 kinds of mode of operations, and under 4 kinds of mode of operations, control method is as follows：
First mode：Work as K1、K2All close, exchange microgrid is in grid-connect mode control, and direct-current micro-grid is in grid-connect mode control；
Second mode：K1Disconnect, K2All close, exchange microgrid is in island mode control, and direct-current micro-grid is in grid-connect mode control
System；
3rd pattern：K1Closure, K2Disconnect, direct-current micro-grid islet operation, using variable power control, exchange micro-grid connection operation；
Fourth mode：K1And K2All disconnect, direct-current micro-grid islet operation, using variable power control, exchange piconet island operation.
2. the variable power control and DC voltage control method of microgrid are mixed according to claim 1, it is characterised in that described
When direct-current micro-grid works in grid-connect mode control, photovoltaic cell is controlled using MPPT, and wind-powered electricity generation is controlled using MPPT, and battery uses
Constant-current charge.
3. the variable power control and DC voltage control method of microgrid are mixed according to claim 1, it is characterised in that described
Direct-current micro-grid islet operation, using variable power control, the variable power control is with the various micro- source inputs of direct-current micro-grid, output
Power see the table below as microgrid switching working mode reference value, including 5 kinds of mode of operations：
In table, Pbattery_c、Pbattery_dThe respectively charge power of battery, discharge power,Respectively
For the maximum of battery charge power, discharge power, Ppv、Pwind、PloadThe work(of photovoltaic, wind-powered electricity generation, load respectively in microgrid
Rate, subscript max are maximum, and min is minimum value, in non-limit variable power control, by gathering photovoltaic in microgrid, wind-powered electricity generation, bearing
Lotus power, then calculate the set-point P of battery charge and discharge powerref-battery_c、Pref-battery_d, finally control battery
Near set-point；In limit variable power control, when the electric current of battery charge and discharge reaches maximum, the limit of battery
Power Calculated by formula, along with the amendment of the voltage change caused by error, and then made
All the time safety and stability works under power limit battery.
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| CN110071496A (en) * | 2019-03-29 | 2019-07-30 | 广东工业大学 | A kind of configuration of direct-current grid power optimization and operation method based on wave-activated power generation |
| CN111525605A (en) * | 2020-04-07 | 2020-08-11 | 北方工业大学 | Photovoltaic system low voltage ride through method and system based on variable power output control |
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| CN116154775A (en) * | 2023-04-20 | 2023-05-23 | 中建科技集团有限公司 | AC/DC hybrid micro-grid system based on photovoltaic power supply and control method thereof |
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