CN106549425B - A kind of failure isolated island fast control method containing flexible direct current - Google Patents
A kind of failure isolated island fast control method containing flexible direct current Download PDFInfo
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- CN106549425B CN106549425B CN201611131324.4A CN201611131324A CN106549425B CN 106549425 B CN106549425 B CN 106549425B CN 201611131324 A CN201611131324 A CN 201611131324A CN 106549425 B CN106549425 B CN 106549425B
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of failure isolated island fast control method containing flexible direct current, pass through friendship respectively for regional power grid, the case where interconnected network that direct current transportation channel is connect with other power grids, it is calculated by off-line simulation and to form control strategy and carry into execution a plan, Off-line control strategy point is promptly corresponded into the different control method of flexible direct current with non-emergent control strategy, then according to the frequency and frequency variation feature when failure isolated island occurs, search the strategy that prior off-line calculation obtains, and confirm execution, frequency and frequency variation are persistently judged, it can be supplied in real time with the result of the action of security and stability control equipment in electric system, islanded system is finally set to restore to stablize.It is an advantage of the invention that directly determining flexible direct current control method by using the mode for looking into off-line strategy scheme, sampling calculation amount is few, judgement is quick, control efficiency is high, to improve the frequency stability and performance driving economy of isolated island after failure.
Description
Technical field
The invention belongs to technical field of power system operation control, and in particular to a kind of failure isolated island containing flexible direct current is fast
Speed control method.
Background technique
Flexible DC transmission (soft straight) technology uses all-controlling power electronics device, has rapid tidal current control, dynamic
Reactive power support, multiport coordinated operation prevent fault coverage from many-sided advantage such as expanding.Multiple regions power grid is defeated by alternating current-direct current
It is electrically connected to form interconnected network, when important section breaks down, area power grid voltage and frequency stabilization problem will occur, seriously
Threaten power network safety operation.System stablize destroyed after, need to usually be cut by stability control device action machine (or cutting load) with
Guarantee system stable operation.After flexible direct current is applied to interconnected network, power grid objectively requires it to play above-mentioned advantage and peace
Full stability contorting equipment coordination effect is to improve system stability.And there is presently no there is relevant solution, for this
Kind situation, it is necessary to a kind of failure island control method containing flexible direct current is developed, to solve the above problems.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of failure isolated island fast control methods of flexible direct current.For area
Domain power grid passes through the mode of connection that AC and DC passway for transmitting electricity is connected with other power grids respectively, when in ac transmission channel failure
Disconnected forming region island-grid, power shortage will lead to isolated island and lose stable problem, and the present invention is based on regional power grids to lead to respectively
The mode of connection that AC and DC passway for transmitting electricity is connected with other power grids is crossed, calculates to form Off-line control strategy by off-line simulation,
The Off-line control strategy that prior off-line calculation obtains is searched according to frequency and frequency change rate in failure isolated island moment, it will be flexible straight
It flows quick emergent control and accurate non-emergent control organically combines, acted in safety stabilization control system two, three lines of defence
Before, make full use of flexible direct current that there is power flow regulating and reverse function not available for customary DC safely and fast, then benefit
The implementation deviation of safety stabilization control system can be persistently supplied the characteristics of two-way dynamic regulation isolated island frequency with flexible direct current, finally
Islanded system is set to restore to stablize.
The purpose of the present invention is what is be achieved through the following technical solutions:
Method of the invention is to pass through AC and DC (flexible direct current) passway for transmitting electricity and other electricity respectively for regional power grid
Net connection, when communication channel fault interrupting, therefore the regional power grid forms isolated island, makes it by flexible direct current control strategy
Restore to stablize；It is characterized in that, this method comprises the following steps:
(1) off-line calculation regional power grid communication channel disconnects, and is only connected by flexible direct current with other power grids, forms isolated network
The Off-line control strategy that frequency change rate df/dt, f afterwards is determined；
(2) soft straight current conveying active-power P is acquired in real time0, soft straight current maximum active-power P max and region it is electric
Net and soft straight junction ac bus voltage；
(3) judging whether regional power grid breaks down leads to ac transmission channel interrupt, if at this time only remain direct current channel with
Outer net connection, then isolated island criterion meets, and enters step (4), otherwise return step (2)；
(4) (the soft or hard Frequency Measurement Algorithm of tradition) f, df/dt value is calculated in real time according to busbar voltage collected；
(5) whether it is in recovery process according to regional power grid frequency f and frequency change rate df/dt determination frequency, when frequency
Rate overrate and on a declining curve or frequency lower than rated value and in rising trend, that is, meet f > fN and df/dt < 0 or
Meet f < fN and then return step (4) df/dt > 0, otherwise enters step (6)；
(6) judge whether to take according to regional power grid frequency f and frequency change rate df/dt combination Off-line control strategy tight
Anxious control, if then entering step (7), otherwise enters step (8)；
(7) search in offline emergent strategy corresponding region power grid in total active difference Pi, according to it is soft directly currently convey it is active
Power P0, soft straight current maximum active-power P max, soft straight measure amount is calculated and directly executes, step is returned after executive measure
Suddenly (4)；
(8) start FLC (Frequency limit controller (frequency limit controller, FLC)), carry out soft straight non-
Emergent strategy measure executes, return step (4) after executive measure.
Particularly, in step (1), the calculating of Off-line control strategy is to use interconnected network reality using simulation software
Border parameter carries out failure isolated island simulation calculation, and it is always active to obtain frequency change rate d1~d6, frequency f1~f6 and regional power grid
The value of difference P1~P6, and confirm the relationship of frequency f, df/dt and executive measure:
1. when meeting fN≤f < f4 and d1≤df/dt < d2:
Enter emergency control policy after regional power grid isolated island, total active difference is P1；
2. when meet f5≤f < f6 and 0≤df/dt < d3, f4≤f < f5 and d1≤df/dt < d3, fN≤f < f4 and
When d1≤df/dt < d2:
Enter emergency control policy after regional power grid isolated island, total active difference is P2；
3. when meeting f6≤f and 0≤df/dt or when meeting fN≤f < f6 and d3≤df/dt:
Enter emergency control policy after regional power grid isolated island, total active difference is P3；
4. when meeting f3≤f < fN and d5≤df/dt < d4:
Enter emergency control policy after regional power grid isolated island, total active difference is P4；
5. when meet f1≤f < f2 and d6≤df/dt < 0 or meet f2≤f < f3 and d6≤df/dt < d4 or meet
F3≤f < fN and when d6≤df/dt < d5:
Enter emergency control policy after regional power grid isolated island, total active difference is P5；
6. when meeting f < f1 and df/dt < 0 or when meeting f1≤f < fN and df/dt < d6:
Enter emergency control policy after regional power grid isolated island, total active difference is P6；
7. when meeting f2≤f < fN and d4≤df/dt < 0 or when meeting fN≤f < f5 and 0≤df/dt < d1:
Enter non-emergent control strategy after regional power grid isolated island, off-line simulation calculates the main control parameters of confirmation FLC
(KP, Ti), soft straight active power can be controlled to adjust by the proportional integration ring of FLC makes isolated island restore to stablize, and FLC function belongs to ratio
More mature technology, this will not be repeated here.
Particularly, in step (7), corresponding region power grid is searched in offline emergent strategy in total active difference Pi, it is soft straight
Current conveying active-power P0, soft straight current maximum active-power P max, soft straight measure amount and directly execution is calculated:
1. the Pi that finds and meeting soft straight current conveying active-power P in emergent strategy control0Power direction is identical (opposite
In orphan
Net be send out or be into) when:
When | Pi |≤Pmax- | P0|, then directly specify the soft straight active reference value to be | P0|+| Pi | and promote direct current；
When | Pi | > Pmax- | P0|, then directly specify soft straight active reference value to be Pmax and promote direct current.
2. the Pi that finds and meeting soft straight current conveying active-power P in emergent strategy control0Power direction is opposite (opposite
In isolated network one be send out one for entered) when:
When | Pi |≤| P0|, then the soft straight active reference value after directly specified reversion is | P0|-| Pi | and return drop direct current；
When | P0| < | Pi |≤Pmax+ | P0|, then first flexible direct current rapid tidal current is inverted, and after directly specified reversion
It is soft directly to have
Function reference value is | Pi |-| P0| and promote direct current；
When | Pi | > Pmax+ | P0|, then first flexible direct current rapid tidal current is inverted, and soft after directly specified reversion directly has
Function ginseng
Value is examined to be Pmax and promote direct current.
Flexible direct current control strategy acts before power system security stability contorting two, three lines of defence, if flexible direct current
The margin of power has run out, and system frequency cannot still be restored, and will then be adopted by power system security stability contorting two, three lines of defence
The machine of cutting (cutting load) measure is taken, it is by whole generator or entirely negative that practical safety stabilization control system, which cuts machine (cutting load) measure,
Lotus combination, therefore and theoretical power (horse-power) vacancy there are deviation, frequency anomaly caused by this deviation is can be straight by flexibility of the invention
Flow control policy is supplied, and isolated network after failure will finally be made to restore to stablize.
The beneficial effects of the present invention are:
Pass through AC and DC passway for transmitting electricity and other power grids respectively for regional power grid under the mode of connection of connection, this hair
It is bright by the way that soft straight Off-line control strategy protocol is calculated using system emulation data offline, when important communication channel interrupt when,
According to the value of the isolated network frequency and obtained frequency change rate that calculate in real time, searches corresponding soft straight control measure and execute, and with
It is different that frequency caused by safety stabilization control system movement deviation is supplied using failure isolated island fast control method of the invention afterwards
Often.This method sampling calculation amount is few, judgement is quick, control efficiency is high, to improve the frequency stability and fortune of isolated island after failure
Row economy.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.Target and other advantages of the invention can be wanted by following specification and right
Book is sought to be achieved and obtained.
Detailed description of the invention
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
The detailed description of one step, in which:
Fig. 1 show the power network wiring schematic diagram containing flexible direct current；
Fig. 2 show application example electric network wiring scheme of the invention；
Fig. 3 show the non-emergent control strategy schematic diagram of FLC；
Fig. 4 is a kind of failure isolated island stable control method flow chart of the present invention；
Specific embodiment
Hereinafter reference will be made to the drawings, and a preferred embodiment of the present invention will be described in detail.It should be appreciated that preferred embodiment
Only for illustrating the present invention, rather than limiting the scope of protection of the present invention.
Technical solution of the present invention is further stated in detail with reference to the accompanying drawings of the specification.
Signified power network wiring containing flexible direct current of the invention is as shown in Figure 1, regional power grid S2 is connected separately by communication channel
One power grid S1, while direct current channel is formed by by flexible direct current and connects another power grid S3.Friendship between power grid S2 and S1
Circulation road break down tripping when, regional power grid S2 forms isolated network due to failure.
It is fast that a kind of failure isolated island containing flexible direct current is discussed in detail by taking attached certain practical structures shown in Fig. 2 as an example in the application
Speed control method.System parameter used by off-line simulation is the electric system actual parameter, soft lineal system rated direct voltage
For ± 204kV, inverter uses the modularization multi-level converter technology that is based on, and inverter rated capacity 300MVA is operated normally
When inverter it is maximum it is active be 290MW, set the soft active power 150MW for directly sharing electromagnetic looped network, and not with systems exchange without
Function power.The total installation of generating capacity of S1, S2, S3 are respectively 1200MW, 1740MW, 29890MW.
The step of carrying out practical operation using a kind of failure isolated island fast control method containing flexible direct current of the invention is such as
Under:
(1) flexible direct current Off-line control strategy is calculated using simulation software, uses the interconnected network actual parameter shown in Fig. 2
Failure isolated island simulation calculation is carried out, frequency change rate d1~d6 is obtained and is respectively as follows: 0.5,0.9,1.3, -0.6, -1.0, -1.5
(Hz/s), frequency f1~f6 is respectively 49.1,49.3,49.6,50.3,50.6,50.8 (Hz):, the total active difference of regional power grid
The value of P1~P6 is respectively as follows: 220,470,600, -230, -454, -590 (MW), which is 50 (Hz).Confirmation
The relationship of frequency f, df/dt and executive measure control strategy as shown in Figure 3, specific as follows:
1. when meeting 50≤f < 50.3 and 0.5≤df/dt < 0.9:
Enter emergency control policy after regional power grid isolated island, total active difference is 220 (MW)；
2. when meet 50.6≤f < 50.8 and 0≤df/dt < 1.3,50.3≤f < 50.6 and 0.5≤df/dt < 1.3,
50≤f < 50.3 and when 0.5≤df/dt < 0.9:
Enter emergency control policy after regional power grid isolated island, total active difference is 470 (MW)；
3. as 50.8≤f of satisfaction and 0≤df/dt or satisfaction 50≤f < 50.8 and 1.3≤df/dt:
Enter emergency control policy after regional power grid isolated island, total active difference is 600 (MW)；
4. when meeting 49.6≤f <, 50 and -1.0≤df/dt < -0.6:
Enter emergency control policy after regional power grid isolated island, total active difference is -230 (MW)；
5. when meeting 49.1≤f <, 49.3 and -1.5≤df/dt < 0 or meeting 49.3≤f <, 49.6 and -1.5≤df/
When dt < -0.6 or satisfaction 49.6≤f <, 50 and -1.5≤df/dt < -1.0:
Enter emergency control policy after regional power grid isolated island, total active difference is -454 (MW)；
6. when meeting f < 49.1 and df/dt < 0 or meeting 49.1≤f < 50 and when df/dt < -1.5:
Enter emergency control policy after regional power grid isolated island, total active difference is -590 (MW)；
7. when meeting 49.3≤f <, 50 and -0.6≤df/dt < 0 or meeting 50≤f < 50.6 and 0≤df/dt < 0.5
When:
Enter non-emergent control strategy after regional power grid isolated island, off-line simulation calculates the main control parameters of confirmation FLC
(KP, Ti), for this example by simulation calculation, the control effect when it is 10 that Kp value, which is 1.0, Ti value, is ideal.It can lead to
The proportional integration ring for crossing FLC, which controls to adjust soft straight active power, makes isolated island restore to stablize, and FLC function belongs to the skill of comparative maturity
Art, control block diagram often use classic control block diagram, the non-emergent control strategy of FLC as shown in Figure 3, because it is in ability using engineering
Domain belongs to well-known technique, so the present invention repeats no more.
(2) soft straight current conveying active-power P is collected in real time0For 150MW, direction is isolated network transport direction, soft straight
Current maximum active-power P max is 290MW, while pickup area power grid and soft straight junction ac bus voltage；
(3) judging whether regional power grid breaks down leads to ac transmission channel interrupt, if at this time only remain direct current channel with
Outer net connection, then isolated island criterion meets, and enters step (4), otherwise return step (2)；
(4) f, df/dt value are calculated according to busbar voltage collected in real time, (counted using the soft or hard Frequency Measurement Algorithm of tradition
Calculation method is conventional technical means in the art) f is measured after failure is 49.5 (Hz), df/dt is -1.9 (Hz/s)；
(5) whether it is in recovery process, is discontented with according to regional power grid frequency f and frequency change rate df/dt determination frequency
Sufficient frequency retrieval process conditional, then enter step (6)；
(6) soft straight emergency control policy is met according to regional power grid frequency f and frequency change rate df/dt, entered step
(7)；
(7) it is -590 (MW) that corresponding region power grid, which is P6 in total active difference Pi, in the offline emergent strategy of lookup, according to soft
Straight current conveying active-power P0, soft straight current maximum active-power P max, meet | Pi | > Pmax+ | P0|, then it first will be flexible straight
Rapid tidal current reversion is flowed, and the soft straight active reference value after directly specified reversion is Pmax i.e. 290 (MW) and promotes direct current to 290
(MW)；Soft straight whole idle capacities are finished.The active vacancy of isolated network is 150 (MW) at this time, is cut off by safety stabilization control system
After 190MW load, measuring f at this time is 50.5 (Hz), and df/dt is 0.3 (Hz/s), meets the non-emergent control condition of flexible direct current,
Therefore (8) are entered step；
(8) start FLC (Frequency limit controller), carry out soft straight non-emergent Strategic Measures and execute, pass through proportional integration control
When soft straight reference value is slowly dropped to 255 (MW) by ring processed, isolated network frequency retrieval to rated value.
It should be pointed out that flexible direct current control strategy movement in power system security stability contorting two, three lines of defence it
Before, if the flexible direct current margin of power has run out, system frequency cannot still be restored, then will be by power system security stability contorting
Two, the machine of cutting (cutting load) measure is taken in three lines of defence, and it is by whole that practical safety stabilization control system, which cuts machine (cutting load) measure,
Generator or the combination of entire load, therefore and theoretical power (horse-power) vacancy there are deviation, frequency anomaly caused by this deviation is can be by
Flexible direct current control strategy of the invention is supplied, and isolated network after failure will finally be made to restore to stablize.
The present invention is by being calculated soft straight Off-line control strategy protocol using system emulation data offline, when important exchange
When channel interrupt, according to the value of the isolated network frequency and obtained frequency change rate that calculate in real time, corresponding soft straight control measure are searched
And it executes, and then supply safety stabilization control system movement deviation using failure isolated island fast control method of the invention and lead
The frequency anomaly of cause.This method sampling calculation amount is few, judgement is quick, control efficiency is high, to improve the frequency of isolated island after failure
Stability and performance driving economy.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Scope of the claims in.
Claims (2)
1. a kind of failure isolated island fast control method containing flexible direct current is transmitted electricity by AC and DC logical respectively for regional power grid
Road is connect with other power grids, and when communication channel fault interrupting, the regional power grid passes through flexibility therefore and the case where form isolated island
DC control strategy makes it restore to stablize, characterized by the following steps:
(1) off-line calculation is only connected by flexible direct current with other power grids when the disconnection of regional power grid communication channel, after forming isolated network
Frequency change rate df/dt, f determine Off-line control strategy；Wherein, f is regional power grid frequency；Df/dt is frequency change rate；
Off-line control strategy is to carry out failure isolated island simulation calculation using interconnected network actual parameter using power system simulation software,
Obtain the value of the total active difference P1~P6 of frequency change rate d1~d6, frequency f1~f6 and regional power grid, and confirm frequency f,
The relationship of df/dt and executive measure:
1. when meeting fN≤f < f4 and d1≤df/dt < d2: wherein fN is rated frequency；
Enter emergency control policy after regional power grid isolated island, total active difference is P1；
2. when meet f5≤f < f6 and 0≤df/dt < d3, f4≤f < f5 and d1≤df/dt < d3, fN≤f < f4 and d1≤
When df/dt < d2:
Enter emergency control policy after regional power grid isolated island, total active difference is P2；
3. when meeting f6≤f and 0≤df/dt or when meeting fN≤f < f6 and d3≤df/dt:
Enter emergency control policy after regional power grid isolated island, total active difference is P3；
4. when meeting f3≤f < fN and d5≤df/dt < d4:
Enter emergency control policy after regional power grid isolated island, total active difference is P4；
5. when meet f1≤f < f2 and d6≤df/dt < 0 or meet f2≤f < f3 and d6≤df/dt < d4 or meet f3≤
F < fN and when d6≤df/dt < d5:
Enter emergency control policy after regional power grid isolated island, total active difference is P5；
6. when meeting f < f1 and df/dt < 0 or when meeting f1≤f < fN and df/dt < d6:
Enter emergency control policy after regional power grid isolated island, total active difference is P6；
7. when meeting f2≤f < fN and d4≤df/dt < 0 or when meeting fN≤f < f5 and 0≤df/dt < d1:
Entering non-emergent control strategy after regional power grid isolated island, off-line simulation, which calculates, confirms that FLC's wants control parameter (KP, Ti),
Soft straight active power can be controlled to adjust by the proportional integration ring of FLC makes isolated island restore to stablize；
(2) soft straight current conveying active-power P is acquired in real time0, soft straight current maximum active-power P max and regional power grid with it is soft
Straight junction ac bus voltage；
(3) judge whether regional power grid occurs the interruption of ac transmission channel failure, connect if only remaining direct current channel at this time with outer net,
Then isolated island criterion meets, and enters step (4), otherwise return step (2)；
(4) f, df/dt value are calculated according to busbar voltage collected in real time；
(5) whether it is in recovery process according to regional power grid frequency f and frequency change rate df/dt determination frequency, when frequency is super
Rated value and on a declining curve or frequency are crossed lower than rated value and in rising trend, that is, meet f > fN and df/dt < 0 or meets f
Then return step (4) < fN and df/dt > 0, otherwise enter step (6)；
(6) according to regional power grid frequency f and frequency change rate df/dt combination Off-line control strategy judge whether that urgent control should be taken
System, if then entering step (7), otherwise enters step (8)；
(7) it searches corresponding region power grid in offline emergent strategy and directly currently conveys active power according to soft in total active difference Pi
P0, soft straight current maximum active-power P max, soft straight measure amount is calculated and directly executes, return step after executive measure
(4)；The soft straight measure amount is the amount for flexible direct current power required for recovery system frequency；
(8) initiation culture restriction controller FLC carries out soft straight non-emergent Strategic Measures and executes, return step after executive measure
(4)。
2. a kind of failure isolated island fast control method containing flexible direct current according to claim 1, it is characterised in that: in step
Suddenly in (7), corresponding region power grid is searched in offline emergent strategy in total active difference Pi, soft straight current conveying active-power P0、
Soft straight current maximum active-power P max, is calculated soft straight measure amount and directly executes:
1. the Pi that finds and meeting soft straight current conveying active-power P in emergent strategy control0When power direction is identical, i.e., relatively
In isolated network be send out or be by fashionable:
When | Pi |≤Pmax- | P0|, then directly specify the soft straight active reference value to be | P0|+| Pi | and promote direct current；
When | Pi | > Pmax- | P0|, then directly specify soft straight active reference value to be Pmax and promote direct current；
2. the Pi that finds and meeting soft straight current conveying active-power P in emergent strategy control0When power direction is opposite, i.e., relatively
It is to send out one as by fashionable in isolated network one:
When | Pi |≤| P0|, then the soft straight active reference value after directly specified reversion is | P0|-| Pi | and return drop direct current；
When | P0| < Pi |≤Pmax+ | P0|, then first flexible direct current rapid tidal current is inverted, and soft after directly specified reversion directly has
Function reference value is | Pi |-| P0| and promote direct current；
When | Pi | > Pmax+ | P0|, then first flexible direct current rapid tidal current is inverted, and the soft straight active ginseng after directly specified reversion
Value is examined to be Pmax and promote direct current.
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| CN107526009B (en) * | 2017-09-13 | 2019-04-05 | 国电南瑞科技股份有限公司 | It is a kind of that Interlocking Methods are detected according to the isolated island of frequency and curent change timing |
| CN107769226A (en) * | 2017-10-25 | 2018-03-06 | 贵州电网有限责任公司电力调度控制中心 | A kind of mains frequency control method based on mixed DC feed-in |
| CN107994598B (en) * | 2017-10-31 | 2022-07-26 | 中国电力科学研究院有限公司 | AC/DC coordination control method and system |
| CN108695878A (en) * | 2018-05-04 | 2018-10-23 | 国网重庆市电力公司 | A kind of regional power grid height flexible direct current emergency control method and system under by electric ratio |
| CN109103918A (en) * | 2018-10-11 | 2018-12-28 | 国网山东省电力公司 | A method of considering the soft directly to the active support of island network of frequency change rate |
| CN109347111B (en) * | 2018-10-22 | 2022-12-13 | 国网山东省电力公司济南供电公司 | Active and reactive control method of flexible direct current converter station considering voltage change rate |
| CN109713664B (en) * | 2019-01-10 | 2021-01-15 | 清华大学 | Network source coordination control strategy calculation method and system with stable direct current island frequency |
| CN110224446B (en) * | 2019-06-04 | 2023-03-03 | 深圳供电局有限公司 | Isolated network operation frequency control device for local power grid of receiving-end city |
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| CN106099918A (en) * | 2016-06-30 | 2016-11-09 | 国家电网公司 | A kind of method of simulation calculation multi-infeed DC mains frequency emergency control policy |
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| CN105406496A (en) * | 2015-12-15 | 2016-03-16 | 北京四方继保自动化股份有限公司 | Isolated microgrid frequency modulation control method based on measured frequency response identification |
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