CN103346571A - Method and device for controlling microgrid adapting to power grid requirements - Google Patents
Method and device for controlling microgrid adapting to power grid requirements Download PDFInfo
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- CN103346571A CN103346571A CN2013102998272A CN201310299827A CN103346571A CN 103346571 A CN103346571 A CN 103346571A CN 2013102998272 A CN2013102998272 A CN 2013102998272A CN 201310299827 A CN201310299827 A CN 201310299827A CN 103346571 A CN103346571 A CN 103346571A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
Abstract
The invention provides a method for controlling a microgrid adapting to power grid requirements. The method comprises the steps that a busbar voltage at the grid-connecting position of the microgrid is collected; whether the collected busbar voltage of the microgrid is smaller than a per-unit value of 0.8p.u. or not and whether the duration time of a low voltage exceeds 40ms or not are judged, and if the collected busbar voltage of the microgrid is smaller than the per-unit value of 0.8p.u. and the duration time of the low voltage exceeds 40ms, the microgrid is in an emergency voltage supporting control mode, a busbar voltage control mode is adopted in a bidirectional converter in the microgrid, the busbar voltage of a direct current side and the busbar voltage of an alternating current side are respectively used as control targets, and corresponding reactive power is output to a power grid; if the collected busbar voltage of the microgrid is not smaller than the per-unit value of 0.8p.u. and the duration time of the low voltage does not exceed 40ms, the microgrid is in a dynamic reactive power optimization mode, an reactive power and active power control mode is adopted in the bidirectional converter in the microgrid, and whether the power grid has reactive power requirements or not is further judged; if the power grid does not have the reactive power requirements, a reactive power control target is set to be zero, and the microgrid does not transmit reactive power to the power grid; if the power grid has the reactive power requirements, the reactive power control target is set by the microgrid through the reactive power requirements of the power grid, and corresponding reactive power is output to the power grid through the bidirectional converter.
Description
Technical field
The present invention relates to power system operation control field, relate in particular to a kind of microgrid control method and device that adapts to the electrical network demand.
Background technology
Along with energy resource consumption constantly increases, the development and use of regenerative resource become the pith of the more and more national strategy of sustainable development.But because intermittence and the fluctuation of distributed power source will cause certain influence to the normal operation of traditional distribution, the microgrid technology has obtained the attention of countries in the world in recent years.The rise of microgrid technology mainly is in order to solve technology and the managerial problem that distributed power source is incorporated into the power networks and brings, and is the important development direction of distributed power supply technology.The distributed power generation energy supplying system is linked into big electrical network with the microgrid form and is incorporated into the power networks, and is the effective means of performance distributed power generation energy supplying system usefulness.
In the research and engineering of present microgrid, all microgrid is considered as a load of electrical network, the passive dispatch command of accepting electrical network is the power supply of microgrid internal loading.Therefore, microgrid systematic research emphasis is only controlled at the operation of microgrid itself at present, be controlled to be main research object with active power, proposed pattern control and changing method when microgrid is incorporated into the power networks with islet operation, the cooperation between shorter mention microgrid and the electrical network.There is not corresponding improvement measure at the reactive requirement of electrical network itself yet.When line voltage fell, it was also less relatively to utilize the supporting role of reactive voltage to improve the research of power supply reliability, was necessary that therefore the microgrid control mode of carrying out at operation of power networks improves.
Summary of the invention
Technical problem to be solved by this invention is, a kind of microgrid control method and device that adapts to the electrical network demand is provided, can analyze the reactive requirement of electrical network under the different running status of microgrid, and export corresponding reactive power, thereby realize the idle cooperation between microgrid and the electrical network, improve the operation level of regional power grid.
In order to solve the problems of the technologies described above, the invention provides a kind of microgrid control method that adapts to the electrical network demand, comprising:
Step S1 gathers the busbar voltage that microgrid is incorporated into the power networks and locates;
Step S2 judges whether the described microgrid busbar voltage that collects is lower than perunit value 0.8p.u. and whether the low-voltage duration surpasses 40ms, if then enter step S3, otherwise enters step S4;
Step S3, microgrid enter emergency voltage support and control pattern, and the two way convertor in the microgrid adopts the busbar voltage control model, serve as the control target with DC side busbar voltage Udc with exchanging side bus voltage U ac respectively, export corresponding reactive power to electrical network;
Step S4, microgrid enter dynamic reactive and optimize pattern, and the two way convertor in the microgrid adopts meritorious and reactive power PQ control model, and judge further whether electrical network has reactive requirement, if electrical network does not have reactive requirement, then enter step S5, if there is reactive requirement in electrical network, then enter step S6;
Step S5, setting idle control target Qref is zero, microgrid will not carried reactive power to electrical network, only to the electrical network active power of output;
Step S6, microgrid is set Reactive Power Control target Qref according to the reactive requirement of electrical network, and exports corresponding reactive power by two way convertor to electrical network.
Wherein, described step S3 specifically comprises:
Setting alternating voltage reference signal Uacref value is 0.8p.u.;
After the instantaneous alternating voltage Uac that gathers is the low pass filter filtering of Tr through time constant filter, obtain average power content Uacfilt, described average power content Uacfilt and described alternating voltage reference signal value Uacref are compared, and error is carried out PI control, behind mould value limiter, obtain the friendship axle controlled quentity controlled variable Iqref of two way convertor;
The two way convertor of microgrid is exported corresponding reactive power according to described friendship axle controlled quentity controlled variable Iqref to electrical network.
Wherein, also comprise:
Setting direct voltage reference signal value Udcref is 1.0p.u.;
After the instantaneous direct voltage Udc that gathers is the low pass filter filtering of Tr through time constant filter, obtain average power content Udcfilt, described average power content Udcfilt and described direct voltage reference signal value Udcref are compared, and error is carried out proportional integral PI control, behind mould value limiter, obtain the d-axis controlled quentity controlled variable Idref of two way convertor;
The two way convertor of microgrid is exported corresponding active power according to described d-axis controlled quentity controlled variable Idref to electrical network.
Wherein, described step S6 specifically comprises:
According to electric network reactive-load requirements set reactive power reference qref Qref;
After instantaneous reactive power Qout is the low pass filter filtering of Tr through time constant filter, obtain average reactive power Qfilt, described average reactive power Qfilt and described reactive power reference qref Qref are compared, and error is carried out PI control, obtain the friendship axle controlled quentity controlled variable Iqref of two way convertor;
The two way convertor of microgrid is exported corresponding reactive power according to described friendship axle controlled quentity controlled variable Iqref to electrical network.
Wherein, also comprise:
Set meritorious value and power reference Pref;
After instantaneous active power Pout is the low pass filter filtering of Tr through time constant filter, obtain average active power Pfilt, described average active power Pfilt and described active power reference value Pref are compared, and error is carried out PI control, obtain the d-axis controlled quentity controlled variable Iqref of two way convertor;
The two way convertor of microgrid is exported corresponding active power according to described d-axis controlled quentity controlled variable Idref to electrical network.
The present invention also provides a kind of microgrid control device that adapts to the electrical network demand, comprising:
Collecting unit is used for gathering the busbar voltage that microgrid is incorporated into the power networks and locates;
First judging unit is used for judging whether the described microgrid busbar voltage that collects is lower than perunit value 0.8p.u. and whether the low-voltage duration surpasses 40ms;
Control unit, be used for when the judged result of described first judging unit is "Yes", the control microgrid enters emergency voltage support and control pattern, two way convertor in the microgrid adopts the busbar voltage control model, serve as the control target with DC side busbar voltage Udc with exchanging side bus voltage U ac respectively, export corresponding reactive power to electrical network; Perhaps be used for when the judged result of described first judging unit is "No", the control microgrid enters dynamic reactive and optimizes pattern, and the two way convertor in the microgrid adopts meritorious and reactive power PQ control model;
Second judging unit is used for judging further whether electrical network has reactive requirement when microgrid enters dynamic reactive optimization pattern;
Output control unit is used for when electrical network does not have reactive requirement, and setting idle control target Qref is zero, and the control microgrid is not carried reactive power to electrical network, only to the electrical network active power of output; When there was reactive requirement in electrical network, the control microgrid was set Reactive Power Control target Qref according to the reactive requirement of electrical network, and exported corresponding reactive power by two way convertor to described electrical network.
Microgrid control method and the device of adaptation electrical network demand provided by the present invention, when being incorporated into the power networks, the microgrid system implements emergency voltage support and control pattern, by two-way inverter full power output reactive power in the microgrid, realize the stable operation ability when the line voltage fault width of cloth falls, improved the power supply reliability of electrical network.When the microgrid system is incorporated into the power networks, adopt the dynamic reactive optimized Control Mode, can distribute with the voltage that improves electrical network to electrical network output reactive power by microgrid, improve the quality of power supply of electrical network integral body.Microgrid will participate in the control procedure that the electrical network dynamic reactive is regulated, and realize cooperating with on one's own initiative of microgrid and electrical network adjusting, for the intelligent grid construction that realizes energy and information interaction provides necessary condition.Only utilize microgrid just can realize the reactive power compensation of electrical network, thereby reduced the input expense of reactive-load compensation equipment in the electrical network.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic flow sheet that one one kinds of the embodiment of the invention adapt to the microgrid control method of electrical network demand.
Fig. 2 is control flow and the principle schematic of emergency voltage support and control pattern in the microgrid control method of the embodiment of the invention one.
Fig. 3 is control flow and the principle schematic that dynamic reactive is optimized pattern in the microgrid control method of the embodiment of the invention one.
Fig. 4 is the structured flowchart that the embodiment of the invention two adapts to the microgrid control device of electrical network demand.
Embodiment
Below with reference to accompanying drawing the preferred embodiments of the present invention are described.
Please refer to shown in Figure 1ly, the embodiment of the invention one provides a kind of microgrid control method that adapts to the electrical network demand, comprising:
Step S1, the busbar voltage (abbreviating the microgrid busbar voltage as) at the collection microgrid place of being incorporated into the power networks.This microgrid busbar voltage will be as the basis of embodiment of the invention microgrid control.
Step S2 judges whether the microgrid busbar voltage collect is lower than the 0.8p.u.(perunit value, the back with) and the low-voltage duration whether surpass 40ms, if then enter step S3, otherwise enter step S4.
Step S3, microgrid enter emergency voltage support and control pattern, and the two way convertor in the microgrid adopts the busbar voltage control model, serve as the control target with DC side busbar voltage Udc with exchanging side bus voltage U ac respectively, export corresponding reactive power.
Step S4, microgrid enters dynamic reactive and optimizes pattern, two way convertor in the microgrid adopts meritorious and reactive power (PQ) control model, further judge whether electrical network has reactive requirement, if electrical network does not have special reactive requirement, then enter step S5, if there is reactive requirement in electrical network, then enter step S6.
Step S5, at this moment because electrical network does not have reactive requirement, therefore setting idle control target Qref is zero, microgrid will be not to electrical network conveying reactive power (Qout) and only to electrical network active power of output (Pout).
Step S6, if there is reactive requirement in electrical network, microgrid is set Reactive Power Control target Qref according to the reactive requirement of electrical network, and exports corresponding reactive power (Qout) by two way convertor, satisfies corresponding active power (Pout) simultaneously.
Please refer to shown in Figure 2ly again, be control flow and the principle schematic of emergency voltage support and control pattern in the embodiment of the invention one microgrid control method.
When microgrid enters into the emergency voltage support modes, two way convertor in the microgrid adopts the busbar voltage control model, setting direct voltage reference signal value Udcref is 1.0p.u., alternating voltage reference signal Uacref value is 0.8p.u., be that target is carried out reactive power calculating with these two voltage reference signals respectively, two way convertor is exported reactive power to electrical network in the microgrid.Wherein:
After the instantaneous alternating voltage Uac that gathers is the low pass filter filtering of Tr through time constant filter, obtain average power content Uacfilt, the alternating voltage reference signal value Uacref of this average power content Uacfilt and setting is compared, and error is carried out PI control, behind mould value limiter, obtain the d-axis controlled quentity controlled variable Idref of two way convertor and hand over axle controlled quentity controlled variable Iqref.The two way convertor of microgrid is according to handing over axle controlled quentity controlled variable Iqref to export corresponding reactive power to electrical network.Mould value limiter is used to and prevents in the adjustment process that controlled quentity controlled variable is excessive and carry out amplitude limit.
K among Fig. 2
PUBe voltage-controlled proportionality coefficient, K
IUBe voltage-controlled integral coefficient.In addition, introduce the sagging variable U of voltage
DroopNegative feedback, can reduce the output error of alternating voltage.
Under the emergency voltage support modes, because the microgrid busbar voltage that collects is lower than 0.8p.u., be in low-voltage state, be equivalent to electrical network and have reactive requirement at this moment, therefore need to regulate and hand over axle controlled quentity controlled variable Iqref, control output reactive power is to compensate.
After the instantaneous direct voltage Udc that gathers is the low pass filter filtering of Tr through time constant filter, obtain average power content Udcfilt, the direct voltage reference signal value Udcref of this average power content Udcfilt and setting is compared, and error carried out proportional integral PI(Proportion Integration) control, behind mould value limiter, obtain the d-axis controlled quentity controlled variable Idref of two way convertor.The two way convertor of microgrid is exported corresponding active power according to d-axis controlled quentity controlled variable Iqref to electrical network.
Pass through above-mentioned steps, the control target of DC side busbar voltage Udc is converted into d-axis controlled quentity controlled variable Idref, exchange side bus voltage U ac and be converted into a friendship axle controlled quentity controlled variable Iqref, regulate d-axis controlled quentity controlled variable Idref respectively and hand over axle controlled quentity controlled variable Iqref, make the direct voltage Udc of collection be adjusted to consistent with direct voltage reference signal value Udcref and alternating voltage reference signal value Uacref respectively with alternating voltage Uac.
Please refer to shown in Figure 3ly, is control flow and the principle schematic that dynamic reactive is optimized pattern in the embodiment of the invention one microgrid control method.
When electrical network entered into dynamic reactive optimization pattern, the two way convertor in the microgrid adopted the PQ control model, and need judge that electrical network has or not special reactive requirement this moment again, and carried out wattless power meter and calculate.
When electrical network did not have special reactive requirement, the two way convertor in the microgrid adopted the constant power factor control model, set reactive power Q ref=0, and two way convertor is not exported reactive power in the microgrid.
When electrical network has special reactive power demand, two way convertor in the microgrid receives the power system reactive power demand that the microgrid EMS is assigned, setting Reactive Power Control target---reactive power reference qref Qref, two way convertor is exported corresponding reactive power in the microgrid.Detailed process is: instantaneous active power Pout and reactive power Q out obtain average active power Pfilt and average reactive power Qfilt respectively after time constant filter is the low pass filter filtering of Tr, the active power reference value Pref of average active power Pfilt and setting is compared, be the reactive power demand of electrical network with the reactive power reference qref Qref(of average reactive power Qfilt and setting) compare, and error is carried out PI control, thereby obtain the d-axis controlled quentity controlled variable Iqref of two way convertor respectively and hand over axle controlled quentity controlled variable Iqref, realize the output of active power and reactive power.
Among Fig. 3, K
PPBe the proportionality coefficient of meritorious control, K
IPBe the integral coefficient of meritorious control, P
MaxAnd P
MinMinimum and maximum output limit value for active power; K
PQBe the proportionality coefficient of idle control, K
IQBe the integral coefficient of idle control, Q
MaxAnd Q
MinMinimum and maximum output limit value for reactive power.
By to the description of flow process shown in Fig. 1-3 as can be known, the microgrid control method of the adaptation electrical network demand of the embodiment of the invention one can be according to the different situations of electrical network, and control microgrid reactive power realizes the reactive power exchange between microgrid and the electrical network.When electrical network normally moved, microgrid only provided active power to electrical network, and reactive power is not provided; When the power system reactive power demand was higher, microgrid can provide certain reactive power to electrical network when providing active power to electrical network, reach the purpose of reactive power compensation; When electric network fault voltage fell, microgrid by the reactive voltage characteristic of electrical network, helped line voltage to recover to provide reactive power to electrical network.
Corresponding to the microgrid control method of the adaptation electrical network demand of the embodiment of the invention one, the embodiment of the invention two provides a kind of microgrid control device that adapts to the electrical network demand, as shown in Figure 4, comprising:
Collecting unit 1 is used for gathering the busbar voltage that microgrid is incorporated into the power networks and locates;
First judging unit 2 is used for judging whether the described microgrid busbar voltage that collects is lower than perunit value 0.8p.u. and whether the low-voltage duration surpasses 40ms;
Second judging unit 4 is used for judging further whether electrical network has reactive requirement when microgrid enters dynamic reactive optimization pattern;
Output control unit 5 is used for when electrical network does not have reactive requirement, and setting idle control target Qref is zero, and the control microgrid is not carried reactive power to electrical network, only to the electrical network active power of output; When there was reactive requirement in electrical network, the control microgrid was set Reactive Power Control target Qref according to the reactive requirement of electrical network, and exported corresponding reactive power by two way convertor to described electrical network.
Can learn that by foregoing description the present invention has following beneficial effect:
Implement emergency voltage support and control pattern when 1, the present invention is incorporated into the power networks in the microgrid system, by two-way inverter full power output reactive power in the microgrid, realized the stable operation ability when the line voltage fault width of cloth falls, improved the power supply reliability of electrical network.
Adopt the dynamic reactive optimized Control Mode when 2, the present invention is incorporated into the power networks in the microgrid system, can distribute with the voltage that improves electrical network to electrical network output reactive power by microgrid, improve the quality of power supply of electrical network integral body.
3, microgrid will participate in the control procedure that the electrical network dynamic reactive is regulated among the present invention, realize cooperating with on one's own initiative of microgrid and electrical network adjusting, for the intelligent grid construction that realizes energy and information interaction provides necessary condition.
4, only utilize microgrid just can realize the reactive power compensation of electrical network among the present invention, thereby reduced the input expense of reactive-load compensation equipment in the electrical network.
Above disclosed is preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (6)
1. microgrid control method that adapts to the electrical network demand comprises:
Step S1 gathers the busbar voltage that microgrid is incorporated into the power networks and locates;
Step S2 judges whether the described microgrid busbar voltage that collects is lower than perunit value 0.8p.u. and whether the low-voltage duration surpasses 40ms, if then enter step S3, otherwise enters step S4;
Step S3, microgrid enter emergency voltage support and control pattern, and the two way convertor in the microgrid adopts the busbar voltage control model, serve as the control target with DC side busbar voltage Udc with exchanging side bus voltage U ac respectively, export corresponding reactive power to electrical network;
Step S4, microgrid enter dynamic reactive and optimize pattern, and the two way convertor in the microgrid adopts meritorious and reactive power PQ control model, and judge further whether electrical network has reactive requirement, if electrical network does not have reactive requirement, then enter step S5, if there is reactive requirement in electrical network, then enter step S6;
Step S5, setting idle control target Qref is zero, microgrid will not carried reactive power to electrical network, only to the electrical network active power of output;
Step S6, microgrid is set Reactive Power Control target Qref according to the reactive requirement of electrical network, and exports corresponding reactive power by two way convertor to electrical network.
2. method according to claim 1 is characterized in that, described step S3 specifically comprises:
Setting alternating voltage reference signal Uacref value is 0.8p.u.;
After the instantaneous alternating voltage Uac that gathers is the low pass filter filtering of Tr through time constant filter, obtain average power content Uacfilt, described average power content Uacfilt and described alternating voltage reference signal value Uacref are compared, and error is carried out PI control, behind mould value limiter, obtain the friendship axle controlled quentity controlled variable Iqref of two way convertor;
The two way convertor of microgrid is exported corresponding reactive power according to described friendship axle controlled quentity controlled variable Iqref to electrical network.
3. method according to claim 2 is characterized in that, also comprises:
Setting direct voltage reference signal value Udcref is 1.0p.u.;
After the instantaneous direct voltage Udc that gathers is the low pass filter filtering of Tr through time constant filter, obtain average power content Udcfilt, described average power content Udcfilt and described direct voltage reference signal value Udcref are compared, and error is carried out proportional integral PI control, behind mould value limiter, obtain the d-axis controlled quentity controlled variable Idref of two way convertor;
The two way convertor of microgrid is exported corresponding active power according to described d-axis controlled quentity controlled variable Idref to electrical network.
4. method according to claim 1 is characterized in that, described step S6 specifically comprises:
According to electric network reactive-load requirements set reactive power reference qref Qref;
After instantaneous reactive power Qout is the low pass filter filtering of Tr through time constant filter, obtain average reactive power Qfilt, described average reactive power Qfilt and described reactive power reference qref Qref are compared, and error is carried out PI control, obtain the friendship axle controlled quentity controlled variable Iqref of two way convertor;
The two way convertor of microgrid is exported corresponding reactive power according to described friendship axle controlled quentity controlled variable Iqref to electrical network.
5. method according to claim 4 is characterized in that, also comprises:
Set meritorious value and power reference Pref;
After instantaneous active power Pout is the low pass filter filtering of Tr through time constant filter, obtain average active power Pfilt, described average active power Pfilt and described active power reference value Pref are compared, and error is carried out PI control, obtain the d-axis controlled quentity controlled variable Iqref of two way convertor;
The two way convertor of microgrid is exported corresponding active power according to described d-axis controlled quentity controlled variable Idref to electrical network.
6. a microgrid control device that adapts to the electrical network demand is characterized in that, comprising:
Collecting unit is used for gathering the busbar voltage that microgrid is incorporated into the power networks and locates;
First judging unit is used for judging whether the described microgrid busbar voltage that collects is lower than perunit value 0.8p.u. and whether the low-voltage duration surpasses 40ms;
Control unit, be used for when the judged result of described first judging unit is "Yes", the control microgrid enters emergency voltage support and control pattern, two way convertor in the microgrid adopts the busbar voltage control model, serve as the control target with DC side busbar voltage Udc with exchanging side bus voltage U ac respectively, export corresponding reactive power to electrical network; Perhaps be used for when the judged result of described first judging unit is "No", the control microgrid enters dynamic reactive and optimizes pattern, and the two way convertor in the microgrid adopts meritorious and reactive power PQ control model;
Second judging unit is used for judging further whether electrical network has reactive requirement when microgrid enters dynamic reactive optimization pattern;
Output control unit is used for when electrical network does not have reactive requirement, and setting idle control target Qref is zero, and the control microgrid is not carried reactive power to electrical network, only to the electrical network active power of output; When there was reactive requirement in electrical network, the control microgrid was set Reactive Power Control target Qref according to the reactive requirement of electrical network, and exported corresponding reactive power by two way convertor to described electrical network.
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| US9660439B2 (en) | 2015-06-05 | 2017-05-23 | General Electric Company | Direct current power distribution and protection system |
| CN106936141A (en) * | 2015-12-30 | 2017-07-07 | 国网辽宁省电力有限公司电力科学研究院 | The active power controller method and its control system of a kind of flexible ring net controller |
| US9991701B2 (en) | 2015-10-15 | 2018-06-05 | General Electric Company | Direct current power distribution and conversion system |
| CN112019065A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
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| CN201805236U (en) * | 2010-05-17 | 2011-04-20 | 东南大学 | Series type LVRT (low voltage ride through) control device of wind generating set |
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