CN108418200A - A kind of voltage hierarchical coordinative control method suitable for direct-current grid - Google Patents
A kind of voltage hierarchical coordinative control method suitable for direct-current grid Download PDFInfo
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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
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Abstract
The invention discloses a kind of voltage hierarchical coordinative control methods suitable for direct-current grid, include the following steps：When respectively layering generates DC voltage deviation to the direct-current grid through droop control, start and improves the control of voltage hierarchical coordinative, change the intercept that each end transverter corresponds to the DC voltage active power droop characteristic of layering, so that transverter is passed through additional issue or absorbed power and charge and discharge are carried out to dc-link capacitance, enables DC voltage restore and be maintained at rated value.The method is by improving the control of voltage hierarchical coordinative so that the voltage that deviation occurs through each layer droop control returns to rated value, has achieved the purpose that DC voltage non differential regulation so that the operation of multiterminal element micro-capacitance sensor is more stable.
Description
Technical field
The present invention relates to a kind of voltage control method technical fields suitable for direct-current grid, more particularly to one kind to be applicable in
In the voltage hierarchical coordinative control method of direct-current grid, belong to direct-current grid technical field.
Background technology
Currently, traditional energy increasingly depleted, environmental problem is more serious, the renewable cleaning based on wind energy, luminous energy etc.
The energy will account for more and more proportions in following energy resource structure；Meanwhile the distributed power generation based on regenerative resource
Mode is widely used also by the useful supplement as conventional Power Generation Mode.And by small distributed power supply and load institute group
At micro-capacitance sensor, the characteristics of according to its connect distributed generation resource, be more suitable for being attached using DC link.Compared to exchange
Micro-capacitance sensor, direct-current grid has the characteristics that simple in structure, controllability is good, transmission capacity is big and line cost is low, in technology
Advantage is economically had more, therefore direct-current grid has become the developing direction of the following micro-capacitance sensor technology.
As shown in Figure 1, multiterminal element micro-grid system includes photovoltaic generating system, accumulator, positioned at exchange major network side
Networking transverter G-VSC, AC load, PV-DC are photovoltaic generating system side boosting copped wave transverter, and B-DC is that battery side is double
To copped wave transverter, networking transverter G-VSC is voltage source converter, and L-VSC is AC load side voltage source converter,
T1 is respectively the transformer for exchanging major network side and AC load side with T2, and each end is connected into public direct-current mother through corresponding transverter
Line.PPV, PB, PG, PL indicate photovoltaic generating system generated output, accumulator cell charging and discharging power, networking transverter output work respectively
Rate and AC load power.
In direct-current grid, DC voltage is the sole indicator of power-balance in reflection system.In the prior art, for
Voltage hierarchical coordinative control method can be used in the DC micro power grid system of multiterminal, and this method judges to control according to DC voltage deviation
The level of system.Under each layer, by the way that networking transverter, accumulator or the droop control of new energy and cutting for load is respectively adopted
It removes to reach voltage-controlled purpose.The principle of voltage hierarchical coordinative control method is as shown in Fig. 2, the control method can divide altogether
It is three layers.
Under first layer, DC voltage deviation is in U1HAnd U1LBetween, U1H、U1LRespectively two above and below battery side transverter
The intercept of sagging curve, power-balance nodes of the networking transverter G-VSC as system, controls the stabilization of DC voltage.Connection
Net transverter G-VSC balances the work(of DC network by " DC voltage-active power " droop characteristic as shown in Figure 2
Rate, the sagging curve are represented by：
Udc=U0-k1PG
In formula：UdcFor DC bus-bar voltage, PGFor transverter output power of networking, U0、k1It indicates respectively under networking transverter
Characteristic intercept of hanging down and slope.In Fig. 2, PG_minFor the minimum value for transverter output power of networking, PG_maxFor the change of current of networking
The maximum value of device output power.When DC voltage deviation is more than U1HOr it is less than U1LWhen, the output power for transverter of networking reaches most
Small value PG_minOr maximum value PG_max。
Under the second layer, DC voltage deviation is in U1HAnd U2HBetween or U1LAnd U2LBetween, U2HFor photovoltaic generating system side
The intercept of transverter droop characteristic, U2LFor the startup threshold value of load off-load, the friendship of network transverter G-VSC and DC network
It changes power and reaches limit value, the balance nodes by battery side transverter B-DC as system power control the stabilization of DC voltage.
Battery side transverter B-DC balances direct current net by " DC voltage-active power " droop characteristic as shown in Figure 2
The power of network, the sagging curve are represented by：
Udc=U1-k2PB
In formula：UdcFor DC bus-bar voltage, PBFor accumulator cell charging and discharging power, U1、k2Battery side transverter is indicated respectively
The intercept and slope of droop characteristic, the here corresponding U of top half curve1Take U1H, k2Take k2H, lower half portion curve correspondence
U1Take U1L, k2Take k2L.In Fig. 2, PB_minFor the minimum value of battery side transverter output power, PB_maxIt is changed for battery side
Flow the maximum value of device output power.When DC voltage deviation is more than U2HOr it is less than U2LWhen, the output power of battery side transverter
Reach minimum value PB_minOr maximum value PB_max。
Under third layer, DC voltage deviation is in U2HAnd U3HBetween or U2LAnd U3LBetween, U3H、U3LRespectively third layer control
The limiting voltage threshold value of system, networking transverter G-VSC and battery side transverter B-DC are reached with the power that exchanges of DC network
To limit value.At this time by the additional droop control or load off-load of photovoltaic generating system side transverter PV-DC come balance system work(
Rate controls the stabilization of DC voltage.
When DC voltage deviation is in U2HAnd U3HBetween when, photovoltaic generating system side transverter PV-DC passes through such as Fig. 2 institutes
" DC voltage-active power " droop characteristic that shows balances the power of DC network, which is represented by：
Udc=U2H-k3HΔPPV
In formula：Udc is DC bus-bar voltage, and Δ PPV is that photovoltaic generating system subtracts hair power, and U2H, k3H indicate light respectively
The intercept and slope of photovoltaic generating system side transverter droop characteristic.In Fig. 2, Δ PPV_max is that photovoltaic generating system side is changed
Stream device subtracts the maximum value of hair power.When DC voltage deviation is more than U3H, the hair power that subtracts of photovoltaic generating system side transverter reaches
To maximum value Δ PPV_max.
When DC voltage deviation be between U2L and U3L when, to avoid DC voltage from continuing to reduce, need to load into
Row off-load operates.At this point, importance rate is arranged to all loads, the load of each grade corresponds to a threshold voltage, grade
Lower load, threshold voltage is higher, i.e. the low load of importance rate is preferentially removed, above-mentioned voltage threshold be in U2L and
Between U3L.To avoid the switching repeatedly of load, when DC voltage gos up, load does not automatically engage, but according to system situation
Input manually.
As shown in Figure 2, in the control of multiterminal element micro-capacitance sensor voltage hierarchical coordinative, the droop control of each layer is to direct current
The droop control of pressure, response speed are very fast.However, after DC bus-bar voltage upon mediation reaches stable state, offrating is excessively not
Conducive to the normal operation to the stringent equipment of voltage request, it is therefore desirable to improve existing control method and voltage is restored and is maintained at
Rated value.
The control method is without communication, reliability higher, however there is also power regulation after, DC voltage occurs inclined
Difference is unable to maintain that the rated value the problem of, affects to the operation that DC micro power grid system is respectively held.Therefore, it is necessary to
A kind of hierarchical coordinative for making the DC voltage of multiterminal element micro-capacitance sensor restore and be maintained at rated value after hierarchical coordinative control
Control method.
Invention content
The technical problem to be solved by the present invention is to how provide a kind of voltage hierarchical coordinative suitable for direct-current grid
Control method.
In order to solve the above technical problems, the technical solution used in the present invention is：A kind of electricity suitable for direct-current grid
Hierarchical coordinative control method is pressed, is included the following steps：
When the direct-current grid first to third layer generates DC voltage deviation through droop control, change each end change of current
Device corresponds to the initial intercept of DC voltage-active power droop characteristic of layering, so that transverter is passed through additional issue or absorbs work(
Rate carries out charge and discharge to dc-link capacitance, enables DC voltage restore and is maintained at rated value.
Under first layer control, changes the initial intercept of G-VSC droop control curves and the voltage threshold of each layer, make G-
VSC carries out charge and discharge by additional issue or absorbed power to dc-link capacitance, enables DC voltage restore and is maintained at rated value；
Under second layer control, changes the initial intercept of B-DC droop control curves and the voltage threshold of each layer, make B-DC
Charge and discharge are carried out to dc-link capacitance by additional issue or absorbed power, enables DC voltage restore and is maintained at rated value；
Under third layer control, changes PV-DC and adds the initial intercept of droop control curve and the voltage threshold of each layer,
So that PV-DC is passed through additional issue or absorbed power and charge and discharge are carried out to dc-link capacitance, enables DC voltage restore and be maintained at specified
Value.
The adjustment amount Δ U of the intercept of each end sagging curve controls institute for rated voltage and the difference of virtual voltage through PI
, DC voltage rated value takes 1pu.
The DC micro power grid system includes photovoltaic generating system, accumulator, the AC load of four end radial connections
And networking transverter.
It is using advantageous effect caused by above-mentioned technical proposal：The method is by improving voltage hierarchical coordinative control
System so that the voltage that deviation occurs through each layer droop control returns to rated value, has achieved the purpose that DC voltage non differential regulation, has made
The operation for obtaining multiterminal direct-current grid is more stable.
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the structural schematic diagram of multiterminal element micro-capacitance sensor in the present embodiment；
Fig. 2 is the flow chart of the prior art；
Fig. 3 is the flow chart under the control of the present embodiment first layer；
Fig. 4 is the flow chart under the control of the present embodiment second layer；
Fig. 5 is the flow chart under the control of the present embodiment third layer；
Fig. 6 is the control principle block diagram that transverter is respectively held in the present embodiment；
Fig. 7 the present embodiment changed power figure and direct current that when transverter droop control is networked in application, direct-current grid is respectively held
The voltage change figure of busbar；
Fig. 8 the present embodiment changed power figure and direct current that in battery side transverter droop control, direct-current grid is respectively held
The voltage change figure of busbar；
Fig. 9 is that the present embodiment direct-current grid when application photovoltaic generating system side transverter adds droop control is respectively held
The voltage change figure of changed power figure and DC bus.
Specific implementation mode
Embodiment 1：
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still the present invention can be with
Implemented different from other manner described here using other, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by following public specific embodiment.
As shown in Fig. 3, Fig. 4 and Fig. 5, a kind of voltage hierarchical coordinative control method suitable for direct-current grid, including with
Lower step：
When the direct-current grid first to third layer generates DC voltage deviation through droop control, change each end change of current
Device corresponds to the initial intercept of DC voltage-active power droop characteristic of layering, so that transverter is passed through additional issue or absorbs work(
Rate carries out charge and discharge to dc-link capacitance, enables DC voltage restore and is maintained at rated value.
Under first layer control, changes the initial intercept of G-VSC droop control curves and the voltage threshold of each layer, make G-
VSC carries out charge and discharge by additional issue or absorbed power to dc-link capacitance, enables DC voltage restore and is maintained at rated value；
Under second layer control, changes the initial intercept of B-DC droop control curves and the voltage threshold of each layer, make B-DC
Charge and discharge are carried out to dc-link capacitance by additional issue or absorbed power, enables DC voltage restore and is maintained at rated value；
Under third layer control, changes PV-DC and adds the initial intercept of droop control curve and the voltage threshold of each layer,
So that PV-DC is passed through additional issue or absorbed power and charge and discharge are carried out to dc-link capacitance, enables DC voltage restore and be maintained at specified
Value.
The adjustment amount Δ U of the intercept of each end sagging curve controls institute for rated voltage and the difference of virtual voltage through PI
, DC voltage rated value takes 1pu.
The DC micro power grid system includes photovoltaic generating system, accumulator, the AC load of four end radial connections
And networking transverter.
Under larger time scale, on the basis of each layer droop control of each end transverter, change the " straight of each end transverter
The intercept of galvanic electricity pressure-active power " droop characteristic makes corresponding transverter pass through additional issue or absorbed power to DC network side
Capacitance carries out charge and discharge, enables DC voltage restore and is maintained at rated value.
Improvement control method under first layer is as shown in Figure 3.Discuss that voltage is bent higher than first layer G-VSC droop controls first
The initial intercept U of line0_setThe case where, direct-current grid operates in the A points that networking transverter determines intercept sagging curve when beginning,
UdcAnd rated value has certain deviation；Start and improve control method, G-VSC subtracts hair power and discharges dc-link capacitance, Udc
It reduces, direct-current grid is run by A points to the A ' points for becoming intercept sagging curve, and G-VSC stoppings subtract hair power, UdcIt is maintained at specified
Value.By the control, the initial intercept U of first layer G-VSC droop control curves0_setVariable quantity be Δ U1H, the voltage of each layer
Threshold value also simultaneously changes delta U1H, i.e., all controlling curves entirety are past to move down Δ U1H.Voltage can similarly be obtained and be less than U0_setThe case where
Under, the changing rule of each layer controlling curve.
Improvement control method under the second layer is as shown in Figure 4.Discuss voltage higher than under second layer B-DC top halfs first
The initial intercept U of vertical controlling curve1H_setThe case where, direct-current grid operates in battery side transverter and determines under intercept when beginning
Catenary C points, UdcAnd rated value has certain deviation；Start and improve control method, B-DC subtracts hair power to dc-link capacitance
It discharges, UdcIt reducing, direct-current grid is run by C points to the C ' points for becoming intercept sagging curve, and B-DC stoppings subtract hair power,
UdcIt is maintained at rated value.By the control, the initial intercept U of second layer B-DC droop control curves1H_setVariable quantity be Δ
U2H, the voltage threshold of each layer also changes delta U simultaneously2H, i.e., all controlling curves entirety are past to move down Δ U2H.It is low can similarly voltage to be obtained
In the initial intercept U of the lower half portion second layer B-DC droop control curve1L_setIn the case of, the variation of each layer controlling curve is advised
Rule.
Improvement control method under third layer is as shown in Figure 5.Here it is sagging only to consider that voltage is added higher than third layer PV-DC
The initial intercept U of controlling curve2H_setThe case where, direct-current grid operates in photovoltaic generating system side transverter and cuts surely when beginning
E points away from sagging curve, UdcAnd rated value has certain deviation；Start and improve control method, PV-DC subtracts hair power to DC bus
Capacitance discharges, UdcIt reduces, direct-current grid is run by E points to the E ' points for becoming intercept sagging curve, and PV-DC stoppings subtract hair work(
Rate, UdcIt is maintained at rated value.By the control, third layer PV-DC adds the initial intercept U of droop control curve2H_setVariation
Amount is Δ U3H, the voltage threshold of each layer also changes delta U simultaneously3H, i.e., all controlling curves entirety are past to move down Δ U3H。
Fig. 6 is respectively to hold converter Control functional block diagram in the improvement voltage hierarchical control method.One secondary control can divide again
For networking converter Control, accumulator control and photovoltaic control, i.e., the droop control of each end transverter.Under each end transverter
It hangs down on the basis of control, by linear quadratic control, adjusts the intercept of former each end sagging curve, i.e., in former U0_set、U1H_set、U1L_set、
U2H_setOn the basis of, increase Δ U, to realize the change of intercept, you can realize and improve the control of voltage hierarchical coordinative.Δ U herein
Gained is controlled through PI for rated voltage and the difference of virtual voltage, DC voltage rated value takes 1pu.
The radial direct-current grid emulation platform in four ends as shown in Figure 1 is built in embodiment, which includes photovoltaic
The rated capacity of electricity generation system, PV-DC is 30kW, and the specified irradiation level of solar panel is 1000W/m2；The rated capacity of accumulator
Rated capacity for 400Ah, B-DC is 10kW；The rated capacity of AC load is 30kW；The rated capacity of networking transverter
For 20kW；DC bus rated voltage is 500V.
Fig. 7 is under first layer control, on the basis of transverter droop control of networking, after improved voltage coordinates control
Operation result.
Referring to Fig. 7, when emulation starts, the power of AC load is about 25kW；Photovoltaic generating system carry out maximum power with
Track, output power are about 25kW；Accumulator is in stand-by state, output power 0；At this point, the output power of exchange major network is
0, DC bus-bar voltage is controlled by G-VSC in 1.00pu or so.When 1s, photovoltaic power generation system output power is reduced to 20kW, directly
Busbar voltage is flowed to be controlled in 0.995pu or so by G-VSC.When 2s, photovoltaic power generation system output power will be 15kW, and direct current is female
Line voltage is controlled by G-VSC in 0.99pu or so.When 3s, the power ascension of AC load to 30kW, DC bus-bar voltage quilt
G-VSC is controlled in 0.985pu or so.When 4s, start secondary pressure regulation, the power of exchange major network additional issue is inhaled by dc-link capacitance
It receives, DC bus-bar voltage increases, and when rising to 1pu, exchange major network no longer issues additional power, and DC bus-bar voltage is controlled by G-VSC
In 1pu.
Fig. 8 is under second layer control, and when transverter of networking reaches power limit, battery side transverter is in sagging control
On the basis of system, improved voltage coordinates the operation result after control.
Referring to Fig. 8, when emulation starts, the power of AC load is about 15kW；Photovoltaic generating system carry out maximum power with
Track, output power are about 15kW；Accumulator is in stand-by state, output power 0；At this point, the output power of exchange major network is
0, DC bus-bar voltage is controlled by G-VSC in 1.00pu or so.When 1s, AC load power rises to 20kW, direct current by 15kW
Busbar voltage is controlled by G-VSC in 0.995pu or so.When 2s, AC load power rises to 30kW, and DC bus-bar voltage is by G-
VSC is controlled in 0.985pu or so.When 3s, photovoltaic power generation system output power is reduced to 5kW, at this point, the output of G-VSC is up to most
Big value, DC bus-bar voltage are controlled by B-DC in 0.965pu or so.When 4s, start secondary pressure regulation, the power of accumulator additional issue
It is absorbed by dc-link capacitance, DC bus-bar voltage increases, and when rising to 1pu, accumulator no longer issues additional power, DC bus electricity
Pressure is controlled by B-DC in 1pu.
Fig. 9 be under third layer control, when network transverter and battery side transverter reach power limit,
Photovoltaic generating system adds on the basis of droop control, and improved voltage coordinates the operation result after control.
Referring to Fig. 9, when emulation starts, the power of AC load is about 15kW；Photovoltaic generating system carry out maximum power with
Track, output power are about 25kW；Accumulator is in stand-by state, output power 0；At this point, the output power of exchange major network is
10kW, DC bus-bar voltage are controlled by G-VSC in 1.01pu or so.When 1s, the output power of G-VSC is restricted to -5kW,
Extra 5kw power is absorbed by accumulator, and DC bus-bar voltage is controlled by B-DC in 1.035pu or so.When 2s, AC load
Power is down to 5kW, and the absorbed power of accumulator reaches limit value, and DC bus-bar voltage is controlled by PV-DC in 1.067pu or so.The
When 3s, AC load power is down to 0kW, and DC bus-bar voltage is controlled by PV-DC in 1.083pu or so.When 4s, start secondary
Pressure regulation, the power that photovoltaic generating system subtracts hair are made up by the power that dc-link capacitance discharges, and DC bus-bar voltage reduces, when
When being down to 1pu, photovoltaic generating system no longer subtracts hair power, and DC bus-bar voltage is controlled by PV-DC in 1pu.
It can be seen that from Fig. 7, Fig. 8 and operation result shown in Fig. 9 by improving the control of voltage hierarchical coordinative so that warp
The voltage that deviation occurs for each layer droop control has returned to rated value, has achieved the purpose that DC voltage non differential regulation, to prove
The validity of the method for the invention.
To sum up, the method is by improving the control of voltage hierarchical coordinative so that the electricity of deviation occurs through each layer droop control
It is pressed back into rated value, has achieved the purpose that DC voltage non differential regulation so that the operation of multiterminal element micro-capacitance sensor is more stable.
Claims (6)
1. a kind of improvement voltage hierarchical coordinative control method suitable for direct-current grid, it is characterised in that:Include the following steps：
When the direct-current grid first to third layer generates DC voltage deviation through droop control, change each end transverter pair
The initial intercept of the DC voltage that should be layered-active power droop characteristic, makes transverter pass through additional issue or absorbed power pair
Dc-link capacitance carries out charge and discharge, enables DC voltage restore and is maintained at rated value.
2. a kind of improvement voltage hierarchical coordinative control method suitable for direct-current grid as described in claim 1, feature
It is：
Under first layer control, change the initial intercept of G-VSC droop control curves and the voltage threshold of each layer, keeps G-VSC logical
It crosses additional issue or absorbed power and charge and discharge is carried out to dc-link capacitance, enable DC voltage restore and be maintained at rated value.
3. a kind of improvement voltage hierarchical coordinative control method suitable for direct-current grid as described in claim 1, feature
It is：
Under second layer control, changes the initial intercept of B-DC droop control curves and the voltage threshold of each layer, B-DC is made to pass through
Additional issue or absorbed power carry out charge and discharge to dc-link capacitance, enable DC voltage restore and are maintained at rated value.
4. a kind of improvement voltage hierarchical coordinative control method suitable for direct-current grid as described in claim 1, feature
It is：
Under third layer control, changes PV-DC and add the initial intercept of droop control curve and the voltage threshold of each layer, make PV-
DC carries out charge and discharge by additional issue or absorbed power to dc-link capacitance, enables DC voltage restore and is maintained at rated value.
5. a kind of improvement voltage hierarchical coordinative control method suitable for direct-current grid as described in claim 1, feature
It is：
The adjustment amount Δ U of the intercept of each end sagging curve controls gained for rated voltage and the difference of virtual voltage through PI,
DC voltage rated value takes 1pu.
6. a kind of improvement voltage hierarchical coordinative control method suitable for direct-current grid as described in claim 1, feature
It is：The DC micro power grid system include the photovoltaic generating systems of four end radials connections, accumulator, AC load and
Networking transverter.
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| CN111509983A (en) * | 2020-03-19 | 2020-08-07 | 深圳供电局有限公司 | Isolated multi-port direct current transformer and control method thereof |
| EP3751691A1 (en) | 2019-06-12 | 2020-12-16 | Wobben Properties GmbH | Electrical power system |
| CN112736892A (en) * | 2020-12-30 | 2021-04-30 | 丽水市普明电力建设工程有限公司 | Coordination control method for preventing voltage of direct current power grid from exceeding limit |
| CN113507106A (en) * | 2021-08-11 | 2021-10-15 | 华北电力大学（保定） | Virtual capacitance control-based DC micro-grid voltage cooperative control method |
| EP3923112A4 (en) * | 2019-02-06 | 2022-07-06 | Panasonic Intellectual Property Management Co., Ltd. | Electric power system and power conversion device |
| CN115967076A (en) * | 2023-03-17 | 2023-04-14 | 国网经济技术研究院有限公司 | New energy direct current collection and delivery system coordination control method and system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3923112A4 (en) * | 2019-02-06 | 2022-07-06 | Panasonic Intellectual Property Management Co., Ltd. | Electric power system and power conversion device |
| US11979021B2 (en) | 2019-02-06 | 2024-05-07 | Panasonic Intellectual Property Management Co., Ltd. | Electric power system and power conversion device connected to a DC bus |
| EP3751691A1 (en) | 2019-06-12 | 2020-12-16 | Wobben Properties GmbH | Electrical power system |
| DE102019115916A1 (en) * | 2019-06-12 | 2020-12-17 | Wobben Properties Gmbh | Electrical power system |
| CN111509983A (en) * | 2020-03-19 | 2020-08-07 | 深圳供电局有限公司 | Isolated multi-port direct current transformer and control method thereof |
| CN112736892A (en) * | 2020-12-30 | 2021-04-30 | 丽水市普明电力建设工程有限公司 | Coordination control method for preventing voltage of direct current power grid from exceeding limit |
| CN112736892B (en) * | 2020-12-30 | 2022-04-08 | 丽水市普明电力建设工程有限公司 | Coordination control method for preventing voltage of direct current power grid from exceeding limit |
| CN113507106A (en) * | 2021-08-11 | 2021-10-15 | 华北电力大学（保定） | Virtual capacitance control-based DC micro-grid voltage cooperative control method |
| CN115967076A (en) * | 2023-03-17 | 2023-04-14 | 国网经济技术研究院有限公司 | New energy direct current collection and delivery system coordination control method and system |
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