CN109755955A - A kind of friendship suitable for bipolarity direct-current grid is straight and straight convertor control strategy - Google Patents
A kind of friendship suitable for bipolarity direct-current grid is straight and straight convertor control strategy Download PDFInfo
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Abstract
A kind of friendship suitable for bipolarity direct-current grid of the present invention is straight and straight convertor control strategy, DC power supply 1 selects sagging coefficient k 1, DC power supply 2 selects sagging coefficient k 2, AC/DC AC-DC converter and DC/DC straight convertor DC bus side total voltage reference value Vref and midpoint degree of unbalancedness δ are obtained according to the voltage reference value Vref- of 1 reference value Vref+ of DC power supply and DC power supply 2, the tracking realized to DC bus total voltage reference value Vref is adjusted based on two close cycles, the distribution of small vector in three-level modulation strategy is adjusted based on mid-point voltage degree of unbalancedness δ, realize the tracking of alignment voltage unbalance factor δ, the difference tracing control to 2 voltage reference value Vref- of 1 voltage reference value Vref+ of DC power supply and DC power supply is realized with this, with this reality The now adjusting of the maintenance to 2 voltage of DC power supply 1 in bipolarity direct-current grid and DC power supply and droop characteristic.
Description
Technical field
The invention patent relates to micro-capacitance sensor fields, more particularly to using the direct-current grid field of bipolarity power supply, adopt
Ac bus is connected with bipolarity DC bus with neutral-point-clamped type three-level topology AC/DC, using three electricity of neutral-point-clamped type
Flat topology DC/DC connects energy-storage battery with bipolarity DC bus.By being total to using the AC/DC and DC/DC of sagging control strategy
With the stabilization for maintaining bipolarity DC bus-bar voltage.According to distributed generation resource, load characteristic and the space of distribution in DC bus
Position distance is respectively connected to the DC power supply 1 and DC power supply 2 of bipolarity DC bus, and DC power supply 1 and direct current is arranged
The different sagging coefficient in source 2, and pass through neutral-point-clamped type three-level topology AC/DC and neutral-point-clamped type three-level topology DC/DC
The droop characteristic of co- controlling DC power supply 1 and DC power supply 2.
Background technique
Micro-capacitance sensor technology be by hair that generator unit, charge storage unit and power unit are combined as a whole, it is defeated, match, with small-sized
Network system, however be DC form, phase using photovoltaic as the generator unit of representative, using battery as energy-storage units of representative itself
Than from the point of view of Alternating Current Power Supply, direct current supply does not have the complicated problems such as phase, frequency, and with DC load and DC equipment
Gradually increase, be a kind of following trend in the form of direct-current grid power supply.Based on the micro- of DC bus droop characteristic
Power grid is the principal mode of the following direct current supply, and similar with ac bus droop characteristic in exchange micro-capacitance sensor, different loads is special
The difference etc. of line impedance determines that DC bus needs to have different in direct-current grid between property, different load and source
Droop characteristic, using different sagging coefficients, this is also a kind of straight and straight change of this friendship suitable for bipolarity direct-current grid
The premise that parallel operation control strategy proposes.
Summary of the invention
Different droop characteristics, asking using different sagging coefficients are needed to have in order to solve DC bus in direct-current grid
Topic, while simplifying DC bus control method, it is directly and straight that the present invention provides a kind of friendships suitable for bipolarity direct-current grid
DC converter control strategy.Using three level AC/DC converter of neutral-point-clamped formula as bipolarity DC bus and ac bus
Connection unit, the connection using three level DC/DC converter of neutral-point-clamped formula as bipolarity DC bus and energy storage device
Unit maintains the stabilization of bipolarity DC bus by three level AC/DC converters and three level DC/DC converters jointly, and leads to
It crosses the improvement to three level AC/DC converters and three level DC/DC converter Traditional control strategies and realizes bipolarity DC bus
Middle DC power supply 1 and 2 being set separately for sagging coefficient of DC power supply and adjusting separately for droop characteristic.
Technical solution
A kind of friendship suitable for bipolarity direct-current grid of the present invention is straight and straight convertor control strategy is straight suitable for bipolarity
Micro-capacitance sensor is flowed, as shown in Figure 1.DC bus divides tri- Vbus+, 0, Vbus- buses in bipolarity direct-current grid, wherein direct current
Bus realizes flow of power by more (n) AC/DC AC-DC converters and transformer and 380VAC ac bus, different type,
The energy-storage battery of different scales passes through DC/DC straight convertor respectively and connect with DC bus.
The present invention it is a kind of suitable for the friendship of bipolarity direct-current grid is straight and straight convertor control strategy DC power supply 1
(Vbus+ is to 0) and DC power supply 2(0 are to Vbus-) it uses different sagging coefficients, show as different droop characteristics to meet
Distributed generation resource and DC load are divided according to type and the demand of the different buses of the access such as on-position and distance.
It invents a kind of friendship suitable for bipolarity direct-current grid directly and straight convertor control strategy passes through more (n)
AC/DC AC-DC converter and Duo Tai (m) DC/DC straight convertor maintain the stabilization of DC bus Vbus+, 0, Vbus- jointly, and
Tune to DC power supply 1 and the different droop characteristics of DC power supply 2 is realized by AC/DC AC-DC converter and DC/DC straight convertor
Section.
The present invention is a kind of, and suitable for the friendship of bipolarity direct-current grid, directly and straight convertor control strategy AC/DC is handed over directly
Converter and DC/DC straight convertor main circuit topology use diode clamp bit-type three-level topology, as shown in Figures 2 and 3.
The present invention is a kind of, and suitable for the friendship of bipolarity direct-current grid, directly and straight convertor control strategy AC/DC is handed over directly
Converter exchanges side and connects 380V AC network by transformer, and DC side exports Vbus+, tri- 0, Vbus- buses, such as Fig. 4
It is shown, the control realization pair to AC/DC AC-DC converter is passed through according to the different droop characteristic of DC power supply 1 and DC power supply 2
The adjusting respectively of DC power supply 1 and DC power supply 2.
The present invention is a kind of, and suitable for the friendship of bipolarity direct-current grid, directly and straight convertor control strategy DC/DC is straight
Wherein DC low-voltage side connects energy-storage battery to converter, and high direct voltage side exports Vbus+, tri- 0, Vbus- buses, such as Fig. 5 institute
Show, is realized by the control to DC/DC AC-DC converter to straight according to the different droop characteristic of DC power supply 1 and DC power supply 2
The adjusting respectively in galvanic electricity source 1 and DC power supply 2.
Beneficial effect
A kind of friendship suitable for bipolarity direct-current grid is straight and straight convertor control strategy is by direct current distributed generation resource, energy storage
It is coupled with DC load etc. in DC side, reduces conversion loss, improve system effectiveness；Secondly, this one kind is suitable for bipolar
Property direct-current grid friendship directly and straight convertor control strategy is using Vbus+, 0, the tri- DC bus powered sides Vbus-
Formula, wherein DC power supply 1(Vbus+ is to 0) with DC power supply 2(0 to Vbus-) different droop characteristics is shown as, using difference
Sagging coefficient, to meet different load characteristic, load from power source space apart from different application demands；Again, this one kind is suitable
Friendship for bipolarity direct-current grid is straight and straight convertor control strategy utilizes three level AC/DC connecting with ac bus
AC-DC converter and three level DC/DC straight convertors connecting with energy-storage battery maintain the stabilization of DC bus-bar voltage jointly,
And control strategy is improved by AC/DC AC-DC converter and DC/DC straight convertor and makes DC power supply 1(Vbus+ to 0) and straight
Galvanic electricity source 2(0 is to Vbus-) show as different droop characteristics, AC/DC AC-DC converter and DC/DC straight convertor topology electricity
Road and actual hardware equipment are mature, the propulsion work in bipolarity of being more convenient for direct-current grid future.
Detailed description of the invention
Fig. 1 is bipolarity direct-current grid block diagram.
Fig. 2 is AC/DC inverter main circuit topological diagram.
Fig. 3 is DC/DC inverter main circuit topological diagram.
Fig. 4 is AC/DC convertor controls block diagram.
Fig. 5 is DC/DC convertor controls block diagram.
In Fig. 1
380VAC is power grid ac bus；
Vbus+ is DC bus positive bus-bar；
0 is female zero bus of direct current；
Vbus- is DC bus negative busbar；
In Fig. 2
A, B, C are AC/DC converter three-phase alternating current terminals；
A1, b1, c1 are AC/DC converter three-phase bridge arm output voltage；
Vbus+, 0, Vbus- are AC/DC converter DC bus；
C1, C2 are AC/DC converter DC bus capacitor；
Ls is AC/DC converter Inductor, C is AC/DC converter exchange lateral capacitance；
In Fig. 3
Vbus+, 0, Vbus- are DC/DC converter DC bus；
C1, C2 are DC/DC converter DC bus capacitor；
L is DC/DC inverter battery side inductance, C is DC/DC inverter battery lateral capacitance；
Vdc+, Vdc- are DC/DC inverter battery side voltage.
In Fig. 4
Vn+ is that AC/DC converter exports Vbus+ to DC power supply 1 in 0(Fig. 1) voltage rating；
Vn- is that AC/DC converter exports DC power supply 2 in 0 couple of Vbus-(Fig. 1) voltage rating；
In+ is that AC/DC converter Vbus+ bus exports electric current；
In- is that AC/DC converter Vbus- bus exports electric current；
K1 is the sagging coefficient of DC power supply 1；
K2 is the sagging coefficient of DC power supply 2；
Vref+ is that AC/DC converter exports Vbus+ to DC power supply 1 in 0(Fig. 1) voltage reference value；
Vref- is that AC/DC converter exports DC power supply 2 in 0 couple of Vbus-(Fig. 1) voltage reference value；
Vref is that AC/DC converter exports Vbus+ to DC power supply 1 in Vbus-(Fig. 1 plus DC power supply 2) voltage reference value；
δ is that AC/DC converter exports mid-point voltage degree of unbalancedness.
In Fig. 5
Vn+ is that DC/DC converter exports Vbus+ to DC power supply 1 in 0(Fig. 1) voltage rating；
Vn- is that DC/DC converter exports DC power supply 2 in 0 couple of Vbus-(Fig. 1) voltage rating；
In+ is that DC/DC converter Vbus+ bus exports electric current；
In- is that DC/DC converter Vbus- bus exports electric current；
K1 is the sagging coefficient of DC power supply 1；
K2 is the sagging coefficient of DC power supply 2；
Vref+ is that DC/DC converter exports Vbus+ to DC power supply 1 in 0(Fig. 1) voltage reference value；
Vref- is that DC/DC converter exports DC power supply 2 in 0 couple of Vbus-(Fig. 1) voltage reference value；
Vref is that DC/DC converter exports Vbus+ to DC power supply 1 in Vbus-(Fig. 1 plus DC power supply 2) voltage reference value；
δ is that DC/DC converter exports mid-point voltage degree of unbalancedness.
Specific embodiment
As shown in Figure 1, bipolarity direct-current grid includes Vbus+, tri- 0, Vbus- DC bus, all distributed electricals
Source, DC load, energy-storage battery etc. are coupled in DC side, and DC bus and 380V power grid ac bus pass through AC/DC
AC-DC converter carries out flow of power.
DC power supply 1(Vbus+ is to 0) with DC power supply 2(0 to Vbus- in bipolarity direct-current grid DC bus) table
It is now different droop characteristics, using different sagging coefficient ks 1 and k2, distributed generation resource and DC load etc. are according to itself spy
Property and on-position are respectively connected to DC power supply 1 and DC power supply 2 at a distance from AC-DC converter and straight convertor etc..
Bipolarity direct-current grid DC bus Vbus+, 0, Vbus- are handed over directly by the more AC/DC connecting with ac bus
The DC/DC straight convertor that converter and Duo Tai are connect with energy-storage battery maintains jointly, other distributed generation resources and DC load
Deng conduct power generation and electrical equipment, it is not involved in the control of DC bus-bar voltage.
As shown in Fig. 2, AC/DC AC-DC converter uses three level of conventional diode clamper type in bipolarity direct-current grid
Topological structure, using LC ac filter form, exchange side is 380VAC, and DC side exports DC power supply 1(Vbus+ to 0) and straight
Galvanic electricity source 2(0 is to Vbus-).
As shown in figure 4, AC/DC AC-DC converter is double in conventional voltage closed loop and current closed-loop in bipolarity direct-current grid
Sagging controlling unit is increased on the basis of closed loop.It is different from traditional two level sagging modes of AC/DC AC-DC converter, in Fig. 4
Sagging controlling unit has been increased separately for DC power supply 1 and DC power supply 2 in AC/DC AC-DC converter control block diagram, has been adopted
With the sagging mode of V/I, DC power supply 1 selects sagging coefficient k 1, and DC power supply 2 selects sagging coefficient k 2.
As shown in figure 4, according to 1 voltage rating Vn+, AC/DC converter Vbus+ bus of AC/DC converter DC power supply
Output electric current in+ and sagging coefficient k 1 obtain the voltage reference value Vref+ of DC power supply 1, according to AC/DC converter DC power supply
2 voltage rating Vn-, AC/DC converter Vbus- buses output electric current in- and sagging coefficient k 2 obtain the voltage of DC power supply 2
Reference value Vref- obtains AC/DC converter DC bus total voltage (Vbus+ is to Vbus-) reference value according to Vref+ and Vref-
Vref and mid-point voltage degree of unbalancedness δ is adjusted based on synchronous rotating frame two close cycles and is realized to the reference of DC bus total voltage
The tracking of value Vref adjusts the distribution of small vector in AC/DC three-level modulation strategy based on mid-point voltage degree of unbalancedness δ, realizes
The tracking of alignment voltage unbalance factor δ is realized with this to 1 voltage reference value Vref+ of DC power supply and 2 voltage of DC power supply ginseng
Examine the difference tracing control of value Vref-.
As shown in figure 3, DC/DC straight convertor uses three level of conventional diode clamper type in bipolarity direct-current grid
Topological structure, using LC filtered version, DC low-voltage side Vdc+, Vdc- terminals connect energy-storage battery, the output of high direct voltage side
DC power supply 1(Vbus+ is to 0) with DC power supply 2(0 to Vbus-).
As shown in figure 5, in bipolarity direct-current grid DC/DC similar with AC/DC straight convertor control strategy in Fig. 4
Straight convertor increases sagging controlling unit on the basis of conventional voltage closed loop and current closed-loop two close cycles.With two electricity of tradition
The sagging mode of flat DC/DC straight convertor is different, for DC power supply 1 and straight in DC/DC straight convertor control block diagram in Fig. 5
Galvanic electricity source 2 has increased separately sagging controlling unit, is all made of the sagging mode of V/I, and DC power supply 1 selects sagging coefficient k 1, direct current
Power supply 2 selects sagging coefficient k 2.
As shown in figure 5, according to 1 voltage rating Vn+, DC/DC converter Vbus+ bus of DC/DC converter DC power supply
Output electric current in+ and sagging coefficient k 1 obtain the voltage reference value Vref+ of DC power supply 1, according to DC/DC converter DC power supply
2 voltage rating Vn-, DC/DC converter Vbus- buses output electric current in- and sagging coefficient k 2 obtain the voltage of DC power supply 2
Reference value Vref- obtains AC/DC converter DC bus total voltage (Vbus+ is to Vbus-) reference value according to Vref+ and Vref-
Vref and mid-point voltage degree of unbalancedness δ is adjusted based on synchronous rotating frame two close cycles and is realized to the reference of DC bus total voltage
The tracking of value Vref adjusts the distribution of small vector in DC/DC three-level modulation strategy based on mid-point voltage degree of unbalancedness δ, realizes
The tracking of alignment voltage unbalance factor δ is realized with this to 1 voltage reference value Vref+ of DC power supply and 2 voltage of DC power supply ginseng
Examine the difference tracing control of value Vref-.
As shown in Figure 4 and Figure 5, the DC power supply 1 of AC/DC AC-DC converter and DC/DC straight convertor is all made of identical
Sagging coefficient k 1, the DC power supply 2 of AC/DC AC-DC converter and DC/DC straight convertor is all made of identical sagging coefficient
K2, to guarantee in AC/DC AC-DC converter and DC/DC straight convertor that different buses are relatively independent, to guarantee between different buses
Load power mean allocation between different converters.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (8)
1. a kind of friendship suitable for bipolarity direct-current grid is straight and straight convertor control strategy, it is characterized in that: bipolarity is straight
Flowing micro-capacitance sensor includes Vbus+, tri- 0, Vbus- DC bus, and all distributed generation resources, DC load, energy-storage battery etc. exist
0) and 2(0 pairs of DC power supply DC side is coupled, and DC power supply 1(Vbus+ is in bipolarity direct-current grid DC bus
Vbus- different droop characteristics) is shown as, using different sagging coefficient ks 1 and k2, the roots such as distributed generation resource and DC load
DC power supply 1 and direct current are respectively connected at a distance from AC-DC converter and straight convertor etc. according to self-characteristic and on-position
Source 2.
2. bipolarity direct-current grid according to claim 1, it is characterised in that bipolarity direct-current grid DC bus
The DC/DC that the AC/DC AC-DC converter and Duo Tai that Vbus+, 0, Vbus- are connect by more with ac bus are connect with energy-storage battery
Straight convertor maintains jointly;
The DC power supply 1 of AC/DC AC-DC converter and DC/DC straight convertor is all made of identical sagging coefficient k 1, and AC/DC is handed over
The DC power supply 2 of DC converter and DC/DC straight convertor is all made of identical sagging coefficient k 2, to guarantee that AC/DC hands over straight become
Different buses are relatively independent in parallel operation and DC/DC straight convertor, with load power between guaranteeing different buses in different converters
Between mean allocation.
3. AC/DC AC-DC converter according to claim 2, it is characterised in that use three level of conventional diode clamper type
Topological structure, using LC ac filter form, exchange side is 380VAC, and DC side exports DC power supply 1(Vbus+ to 0) and straight
Galvanic electricity source 2(0 is to Vbus-).
4. AC/DC AC-DC converter according to claim 2, it is characterised in that AC/DC AC-DC converter control strategy exists
Sagging controlling unit is increased on the basis of conventional voltage closed loop and current closed-loop two close cycles;
Different from traditional two level sagging modes of AC/DC AC-DC converter, AC/DC AC-DC converter control strategy is directed to direct current
Power supply 1 and DC power supply 2 have increased separately sagging controlling unit, are all made of the sagging mode of V/I, and DC power supply 1 selects sagging system
Number k1, DC power supply 2 select sagging coefficient k 2.
5. AC/DC AC-DC converter according to claim 4, it is characterised in that control strategy is according to AC/DC converter
1 voltage rating Vn+, AC/DC converter Vbus+ bus of DC power supply output electric current in+ and sagging coefficient k 1 obtain direct current
The voltage reference value Vref+ in source 1, it is female according to 2 voltage rating Vn-, AC/DC converter Vbus- of AC/DC converter DC power supply
Line output electric current in- and sagging coefficient k 2 obtain the voltage reference value Vref- of DC power supply 2, are obtained according to Vref+ and Vref-
AC/DC converter DC bus total voltage (Vbus+ is to Vbus-) reference value Vref and mid-point voltage degree of unbalancedness δ, based on synchronization
Rotating coordinate system two close cycles adjust the tracking realized to DC bus total voltage reference value Vref, are based on mid-point voltage degree of unbalancedness
δ adjusts the distribution of small vector in AC/DC three-level modulation strategy, realizes the tracking of alignment voltage unbalance factor δ, is realized with this
To the difference tracing control of 2 voltage reference value Vref- of 1 voltage reference value Vref+ of DC power supply and DC power supply.
6. DC/DC straight convertor according to claim 2, it is characterised in that use three level of conventional diode clamper type
Topological structure, using LC filtered version, DC low-voltage side Vdc+, Vdc- terminals connect energy-storage battery, the output of high direct voltage side
DC power supply 1(Vbus+ is to 0) with DC power supply 2(0 to Vbus-).
7. DC/DC straight convertor according to claim 2, it is characterised in that DC/DC straight convertor control strategy exists
Sagging controlling unit is increased on the basis of conventional voltage closed loop and current closed-loop two close cycles;
It is different from traditional two level sagging modes of DC/DC straight convertor, needle in DC/DC straight convertor control block diagram in Fig. 5
Sagging controlling unit has been increased separately to DC power supply 1 and DC power supply 2, has been all made of the sagging mode of V/I, DC power supply 1 selects
Sagging coefficient k 1, DC power supply 2 select sagging coefficient k 2.
8. DC/DC straight convertor according to claim 7, it is characterised in that control strategy is according to DC/DC converter
1 voltage rating Vn+, DC/DC converter Vbus+ bus of DC power supply output electric current in+ and sagging coefficient k 1 obtain direct current
The voltage reference value Vref+ in source 1, it is female according to 2 voltage rating Vn-, DC/DC converter Vbus- of DC/DC converter DC power supply
Line output electric current in- and sagging coefficient k 2 obtain the voltage reference value Vref- of DC power supply 2, are obtained according to Vref+ and Vref-
AC/DC converter DC bus total voltage (Vbus+ is to Vbus-) reference value Vref and mid-point voltage degree of unbalancedness δ, based on synchronization
Rotating coordinate system two close cycles adjust the tracking realized to DC bus total voltage reference value Vref, are based on mid-point voltage degree of unbalancedness
δ adjusts the distribution of small vector in DC/DC three-level modulation strategy, realizes the tracking of alignment voltage unbalance factor δ, is realized with this
To the difference tracing control of 2 voltage reference value Vref- of 1 voltage reference value Vref+ of DC power supply and DC power supply.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110649651A (en) * | 2019-09-09 | 2020-01-03 | 珠海格力电器股份有限公司 | Alternating current-direct current bidirectional converter, adaptive method thereof and electronic device |
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| CN104218805A (en) * | 2014-07-25 | 2014-12-17 | 国家电网公司 | Unipolar-bipolar convertible direct-current converter |
| KR101559331B1 (en) * | 2014-01-24 | 2015-10-14 | 명지대학교 산학협력단 | Apparatus of controling Voltage Balancer of Bipolar DC Microgrid and method therefor |
| CN106786694A (en) * | 2016-12-21 | 2017-05-31 | 太原理工大学 | A kind of bipolarity direct-current grid mixed energy storage system control method for coordinating |
| CN107147145A (en) * | 2017-06-09 | 2017-09-08 | 太原理工大学 | A kind of wind storage bipolarity direct-current grid and control method based on three level DC DC converters |
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| KR101559331B1 (en) * | 2014-01-24 | 2015-10-14 | 명지대학교 산학협력단 | Apparatus of controling Voltage Balancer of Bipolar DC Microgrid and method therefor |
| CN104218805A (en) * | 2014-07-25 | 2014-12-17 | 国家电网公司 | Unipolar-bipolar convertible direct-current converter |
| CN106786694A (en) * | 2016-12-21 | 2017-05-31 | 太原理工大学 | A kind of bipolarity direct-current grid mixed energy storage system control method for coordinating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110649651A (en) * | 2019-09-09 | 2020-01-03 | 珠海格力电器股份有限公司 | Alternating current-direct current bidirectional converter, adaptive method thereof and electronic device |
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