CN106549425A - 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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- 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, for regional power grid respectively by handing over, the situation of the interconnected network that direct current transportation passage is connected with other electrical networks, calculated by off-line simulation and to form control strategy and carry into execution a plan, by the urgent flexible direct current corresponding with non-emergent control strategy of Off-line control strategy point different control methods, then according to the frequency and frequency variation feature when failure isolated island occurs, search the strategy that prior calculated off line is obtained, and confirm to perform, frequency and frequency variation are persistently judged, can be supplied with the result of the action of security and stability control equipment in power system in real time, islanded system is finally made to recover stable.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 amount of calculation is few for which, judge that quick, control efficiency is high, so as 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 technology
Flexible DC power transmission (soft straight) technology employs all-controlling power electronics device, with rapid tidal current control, dynamic
Reactive power support, multiport coordinated operation, many-sided advantage such as prevent fault coverage from expanding.Multiple regional power grids are defeated by alternating current-direct current
Interconnected network is electrically connected to form, when important section breaks down, area power grid voltage and frequency stable problem is will appear from, seriously
Threaten power network safety operation.After system stability is destroyed, generally need to by stability control device action cut machine (or cutting load) with
Ensure system stable operation.Flexible direct current is applied to after interconnected network, electrical network objectively requires its above-mentioned advantage of performance and peace
Full stability contorting equipment coordination acts on improving system stability.And there is presently no and related solution occur, for this
The situation of kind, it is necessary to work out a kind of failure island control method containing flexible direct current, to solve the above problems.
The content of the invention
In view of this, it is an object of the invention to provide a kind of failure isolated island fast control method of flexible direct current.For area
The mode of connection that domain electrical network is connected with other electrical networks by AC and DC passway for transmitting electricity respectively, when in ac transmission channel failure
Disconnected forming region island-grid, power shortage will cause isolated island to lose stable problem, and the present invention is led to respectively based on regional power grid
The mode of connection that AC and DC passway for transmitting electricity is connected with other electrical networks is crossed, calculates to form Off-line control strategy by off-line simulation,
The Off-line control strategy that prior calculated off line is obtained is searched according to frequency and frequency change rate in failure isolated island moment, will be flexible straight
Flow quick emergent control to organically combine with accurate non-emergent control, in safety stabilization control system two, three lines of defence action
Before, make full use of flexible direct current that there is power flow regulating safely and fast and reverse function not available for customary DC, subsequently profit
The implementation deviation of safety stabilization control system can persistently be supplied the characteristics of two-way dynamic regulation isolated island frequency with flexible direct current, finally
Islanded system is made to recover stable.
The purpose of the present invention is achieved through the following technical solutions：
The method of the present invention, is respectively by AC and DC (flexible direct current) passway for transmitting electricity and other electricity for regional power grid
Net connection, when communication channel fault interrupting, therefore the regional power grid forms isolated island, makes which by flexible direct current control strategy
Recover stable；Characterized in that, the method comprises the steps：
(1) calculated off line regional power grid communication channel disconnects, and is only connected with other electrical networks by flexible direct current, forms isolated network
The Off-line control strategy that frequency change rate df/dt, f afterwards determines；
(2) the soft straight current conveying active-power P of Real-time Collection0, 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 causes ac transmission channel interrupt, if now only remain direct current channel with
Outer net connects, then isolated island criterion meets, into step (4), otherwise return to step (2)；
(4) (traditional soft or hard Frequency Measurement Algorithm) f, df/dt value is calculated in real time according to the busbar voltage for being gathered；
(5) according to regional power grid frequency f and frequency change rate df/dt determination frequencies whether in recovery process, when frequency
Rate overrate and on a declining curve or frequency are less than rated value and in rising trend, that is, meet f ＞ fN and df/dt ＜ 0 or
Meet f ＜ fN and df/dt ＞ 0 then return to step (4), otherwise into step (6)；
(6) judge whether to take tight with reference to Off-line control strategy according to regional power grid frequency f and frequency change rate df/dt
It is anxious to control, if then entering step (7), otherwise into step (8)；
(7) search in offline emergent strategy corresponding region electrical network 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, be calculated soft straight measure amount and directly perform, after executive measure, return step
Suddenly (4)；
(8) start FLC (Frequency limit controller (frequency limit controller, FLC)), carry out soft straight non-
Emergent strategy measure is performed, return to step (4) after executive measure.
Especially, in step (1), the calculating of Off-line control strategy is to utilize simulation software, using the interconnected network reality
Border parameter carries out failure isolated island simulation calculation, obtains frequency change rate d1～d6, frequency f1～f6 and regional power grid always active
The value of difference P1～P6, and confirm the relation of frequency f, df/dt and executive measure：
1. when fN≤f ＜ f4 and d1≤df/dt ＜ d2 is met：
Emergency control policy is entered after regional power grid isolated island, its 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
During d1≤df/dt ＜ d2：
Emergency control policy is entered after regional power grid isolated island, its total active difference is P2；
3. when meeting f6≤f and 0≤df/dt or when meeting fN≤f ＜ f6 and d3≤df/dt：
Emergency control policy is entered after regional power grid isolated island, its total active difference is P3；
4. when f3≤f ＜ fN and d5≤df/dt ＜ d4 is met：
Emergency control policy is entered after regional power grid isolated island, its total active difference is P4；
5. when meeting f1≤f ＜ f2 and d6≤df/dt ＜ 0, or meet f2≤f ＜ f3 and d6≤df/dt ＜ d4 or meet
When f3≤f ＜ fN and d6≤df/dt ＜ d5：
Emergency control policy is entered after regional power grid isolated island, its total active difference is P5；
6. when meeting f ＜ f1 and df/dt ＜ 0, or when meeting f1≤f ＜ fN and df/dt ＜ d6：
Emergency control policy is entered after regional power grid isolated island, its 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：
Non-emergent control strategy is entered after regional power grid isolated island, off-line simulation calculates the main control parameters for confirming FLC
(KP, Ti), can control to adjust soft straight active power by the proportional integral ring of FLC makes isolated island recover stable, and FLC functions belong to ratio
More ripe technology, will not be described here.
Especially, in step (7), in searching offline emergent strategy, corresponding region electrical network is in total active difference Pi, soft straight
Current conveying active-power P0, soft straight current maximum active-power P max, be calculated soft straight measure amount and directly perform：
1. in emergent strategy control the Pi that finds with meet soft straight current conveying active-power P0Power direction is identical (relative
In orphan
Net be send or be into) when：
As | Pi |≤Pmax- | P0|, then directly specified soft straight active reference value is | P0|+| Pi | and lift direct current；
As | Pi | ＞ Pmax- | P0|, then directly specify soft straight active reference value to be Pmax and lift direct current.
2. in emergent strategy control the Pi that finds with meet soft straight current conveying active-power P0Power direction is contrary (relative
In isolated network one for send one be into) when：
When | Pi |≤| P0|, then the soft straight active reference value directly after 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 specifying reversion
It is soft directly to have
Work(reference value be | Pi |-| P0| and lift direct current；
As | Pi | ＞ Pmax+ | P0|, then first flexible direct current rapid tidal current is inverted, and directly specify soft directly having after reversion
Work(is joined
Value is examined for Pmax and direct current is lifted.
The action of flexible direct current control strategy controls two, before three lines of defence in power system safety and stability, if flexible direct current
The margin of power has run out, and system frequency can not still be recovered, and subsequently will be adopted by power system safety and stability control two, three lines of defence
The machine of cutting (cutting load) measure is taken, it is by whole electromotor or whole negative that actual safety stabilization control system cuts machine (cutting load) measure
Lotus combines, therefore there is deviation with theoretical power (horse-power) vacancy, and caused by this deviation, frequency anomaly is can be straight by the flexibility of the present invention
Flow control policy is supplied, and after most making failure at last, isolated network recovers stable.
The invention has the beneficial effects as follows：
For regional power grid respectively by AC and DC passway for transmitting electricity with other electrical networks under the mode of connection being connected, this
It is bright to be calculated soft straight Off-line control strategy protocol using system emulation data by offline, when important communication channel interrupts,
According to the real-time isolated network frequency for calculating and the value of the frequency change rate for obtaining, search the soft straight control measure of correspondence and perform, and with
Caused by safety stabilization control system action deviation is supplied using the failure isolated island fast control method of the present invention afterwards, frequency is different
Often.The method sampling amount of calculation is few, judge that quick, control efficiency is high, so as to improve the frequency stability and fortune of isolated island after failure
Row economy.
Other advantages of the present invention, target and feature will be illustrated to a certain extent in the following description, and
And to a certain extent, based on being will be apparent to investigating hereafter to those skilled in the art, Huo Zheke
To be instructed from the practice of the present invention.The target and other advantages of the present invention can pass through description below and right will
Seek book to realize and obtain.
Description of the drawings
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing the present invention is made into
The detailed description of one step, wherein：
Fig. 1 show the power network wiring sketch containing flexible direct current；
Fig. 2 show the application example electric network wiring scheme of the present invention；
Fig. 3 show the non-emergent control strategy schematic diagrams of FLC；
Fig. 4 is a kind of failure isolated island stable control method flow chart of the invention；
Specific embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.It should be appreciated that preferred embodiment
Only for the explanation present invention, rather than in order to limit the scope of the invention.
Technical scheme is further stated in detail with reference to Figure of description.
The power network wiring containing flexible direct current of indication of the present invention is as shown in figure 1, regional power grid S2 is another by communication channel connection
One electrical network S1, while connecting another electrical network S3 by the direct current channel formed by flexible direct current.Friendship between electrical network S2 and S1
Circulation road break down tripping when, regional power grid S2 forms isolated network due to failure.
The application is discussed in detail a kind of failure isolated island containing flexible direct current fast by taking certain practical structures shown in accompanying drawing 2 as an example
Speed control method.The systematic parameter adopted by off-line simulation is the power system actual parameter, soft lineal system rated direct voltage
For ± 204kV, using based on modularization multi-level converter technology, inverter rated capacity 300MVA is normal to run for inverter
When inverter it is maximum active for 290MW, set soft active power 150MW for directly sharing electromagnetic looped network, and not with systems exchange without
Work(power.The total installation of generating capacity of S1, S2, S3 is respectively 1200MW, 1740MW, 29890MW.
The step of practical operation is carried out using a kind of failure isolated island fast control method containing flexible direct current of the present invention is such as
Under：
(1) flexible direct current Off-line control strategy is calculated using simulation software, using 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：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：220th, 470,600, -230, -454, -590 (MW), electrical network rated frequency fN are 50 (Hz).Confirm
The relation control strategy as shown in Figure 3 of frequency f, df/dt and executive measure, it is specific as follows：
1. when 50≤f ＜ 50.3 and 0.5≤df/dt ＜ 0.9 is met：
Emergency control policy is entered after regional power grid isolated island, its 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,
When 50≤f ＜ 50.3 and 0.5≤df/dt ＜ 0.9：
Emergency control policy is entered after regional power grid isolated island, its total active difference is 470 (MW)；
3. as 50.8≤f of satisfaction and 0≤df/dt or 50≤f of satisfaction ＜ 50.8 and 1.3≤df/dt：
Emergency control policy is entered after regional power grid isolated island, its total active difference is 600 (MW)；
4. when 49.6≤f ＜ 50 and -1.0≤df/dt ＜ -0.6 are met：
Emergency control policy is entered after regional power grid isolated island, its total active difference is -230 (MW)；
5. when meeting 49.1≤f, 49.3 and -1.5≤df/dt of ＜ ＜ 0, or meet 49.3≤f, 49.6 and -1.5≤df/ of ＜
Dt ＜ -0.6, or meet 49.6≤f ＜ 50 and -1.5≤df/dt ＜ -1.0 when：
Emergency control policy is entered after regional power grid isolated island, its total active difference is -454 (MW)；
6. when meeting f ＜ 49.1 and df/dt ＜ 0, or when meeting 49.1≤f ＜ 50 and df/dt ＜ -1.5：
Emergency control policy is entered after regional power grid isolated island, its total active difference is -590 (MW)；
7. when meeting 49.3≤f, 50 and -0.6≤df/dt of ＜ ＜ 0, or meet 50≤f ＜ 50.6 and 0≤df/dt ＜ 0.5
When：
Non-emergent control strategy is entered after regional power grid isolated island, off-line simulation calculates the main control parameters for confirming FLC
(KP, Ti), by simulation calculation, the control effect when it is 10 that Kp values are for 1.0, Ti values is ideal for this example.Can lead to
The soft straight active power of proportional integral ring control and regulation for crossing FLC makes isolated island recover stable, and FLC functions belong to the skill of comparative maturity
Art, its control block diagram is using the conventional classics control block diagram of engineering, the non-emergent control strategy of FLC as shown in Figure 3, because which is in ability
Domain belongs to known technology, so the present invention is repeated no more.
(2) Real-time Collection obtains soft straight current conveying active-power P0For 150MW, direction is isolated network transport direction, soft straight
Current maximum active-power P max is 290MW, while pickup area electrical network and soft straight junction ac bus voltage；
(3) judging whether regional power grid breaks down causes ac transmission channel interrupt, if now only remain direct current channel with
Outer net connects, then isolated island criterion meets, into step (4), otherwise return to step (2)；
(4) f, df/dt value is calculated in real time according to the busbar voltage for being gathered, (is counted using traditional soft or hard Frequency Measurement Algorithm
Calculation method is this area routine techniquess means) f is measured after failure for 49.5 (Hz), df/dt is -1.9 (Hz/s)；
(5) it is discontented with whether in recovery process according to regional power grid frequency f and frequency change rate df/dt determination frequencies
Sufficient frequency retrieval process conditional, then into step (6)；
(6) soft straight emergency control policy is met according to regional power grid frequency f and frequency change rate df/dt, into step
(7)；
(7) in searching offline emergent strategy, corresponding region electrical network is -590 (MWs) for P6 in total active difference Pi, according to soft
Straight current conveying active-power P0, soft straight current maximum active-power P max, meet | Pi | ＞ Pmax+ | P0|, then first will be flexible straight
Stream rapid tidal current reversion, and directly specify the soft straight active reference value after reversion to be that Pmax is 290 (MW) and lifts direct current to 290
(MW)；Soft straight one hundred percent reserve capacity is finished.Now the active vacancy of isolated network is 150 (MW), is cut off by safety stabilization control system
After 190MW loads, it is 50.5 (Hz) now to measure f, and df/dt is 0.3 (Hz/s), meets the non-emergent control condition of flexible direct current,
Hence into step (8)；
(8) start FLC (Frequency limit controller), carry out soft straight non-emergent Strategic Measures and perform, passing ratio integration control
When soft straight reference value is slowly dropped to 255 (MW) by ring processed, isolated network frequency retrieval is to rated value.
It is pointed out that the action of flexible direct current control strategy in power system safety and stability control two, three lines of defence it
Before, if the flexible direct current margin of power has run out, system frequency can not still be recovered, subsequently will be by power system safety and stability control
2nd, the machine of cutting (cutting load) measure is taken in three lines of defence, and it is by whole that actual safety stabilization control system cuts machine (cutting load) measure
, therefore there is deviation with theoretical power (horse-power) vacancy in electromotor or the combination of whole load, caused by this deviation, frequency anomaly is can be by
The flexible direct current control strategy of the present invention is supplied, and after most making failure at last, isolated network recovers stable.
The present invention is calculated soft straight Off-line control strategy protocol using system emulation data by offline, when important exchange
During channel interrupt, according to the real-time isolated network frequency for calculating and the value of the frequency change rate for obtaining, the soft straight control measure of correspondence are searched
And perform, and the subsequent failure isolated island fast control method using the present invention is supplied safety stabilization control system action deviation and is led
The frequency anomaly of cause.The method sampling amount of calculation is few, judge that quick, control efficiency is high, so as to improve the frequency of isolated island after failure
Stability and performance driving economy.
Finally illustrate, above example is only unrestricted to illustrate technical scheme, although with reference to compared with
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, and without deviating from the objective and scope of the technical program, which all should be covered in the present invention
Right in the middle of.
Claims (3)
1. a kind of failure isolated island fast control method containing flexible direct current, logical by AC and DC transmission of electricity respectively for regional power grid
Road is connected with other electrical networks, and when communication channel fault interrupting, therefore the regional power grid forms the situation of isolated island, by flexibility
DC control strategy makes which recover stable, it is characterised in that：Comprise the steps：
(1) calculated off line is only connected with other electrical networks by flexible direct current 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；
(2) the soft straight current conveying active-power P of Real-time Collection0, 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, if now only remain direct current channel being connected with outer net,
Then isolated island criterion meets, into step (4), otherwise return to step (2)；
(4) f, df/dt value is calculated in real time according to the busbar voltage for being gathered；
(5) according to regional power grid frequency f and frequency change rate df/dt determination frequencies whether in recovery process, when frequency surpasses
Cross rated value and on a declining curve or frequency less than rated value and in rising trend, that is, meet f ＞ fN and df/dt ＜ 0 or meet f
＜ fN and df/dt ＞ 0 then return to step (4), otherwise into step (6)；
(6) judge whether to take urgent control with reference to Off-line control strategy according to regional power grid frequency f and frequency change rate df/dt
System, if then entering step (7), otherwise into step (8)；
(7) in searching offline emergent strategy, corresponding region electrical network directly currently conveys active power according to soft in total active difference Pi
P0, soft straight current maximum active-power P max, be calculated soft straight measure amount and directly perform, return to step after executive measure
(4)；
(8) initiation culture restriction controller FLC, carries out soft straight non-emergent Strategic Measures and performs, return to step after executive measure
(4)。
2. the failure isolated island fast control method of a kind of flexible direct current according to claim 1, it is characterised in that：In step
(1) in, Off-line control strategy is to utilize power system simulation software, carries out failure isolated island using the interconnected network actual parameter and imitates
It is true to calculate, the value of the total active difference P1～P6 of frequency change rate d1～d6, frequency f1～f6 and regional power grid is obtained, and is confirmed
The relation of frequency f, df/dt and executive measure：
1. when fN≤f ＜ f4 and d1≤df/dt ＜ d2 is met：Wherein fN is rated frequency；
Emergency control policy is entered after regional power grid isolated island, its total active difference is P1；
2. when meeting f5≤f ＜ f6 and 0≤df/dt ＜ d3, f4≤f ＜ f5 and d1≤df/dt ＜ d3, fN≤f ＜ f4 and d1≤
During df/dt ＜ d2：
Emergency control policy is entered after regional power grid isolated island, its total active difference is P2；
3. when meeting f6≤f and 0≤df/dt or when meeting fN≤f ＜ f6 and d3≤df/dt：
Emergency control policy is entered after regional power grid isolated island, its total active difference is P3；
4. when f3≤f ＜ fN and d5≤df/dt ＜ d4 is met：
Emergency control policy is entered after regional power grid isolated island, its 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≤
When f ＜ fN and d6≤df/dt ＜ d5：
Emergency control policy is entered after regional power grid isolated island, its total active difference is P5；
6. when meeting f ＜ f1 and df/dt ＜ 0, or when meeting f1≤f ＜ fN and df/dt ＜ d6：
Emergency control policy is entered after regional power grid isolated island, its 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：
Non-emergent control strategy is entered after regional power grid isolated island, off-line simulation calculates the main control parameters (K for confirming FLCP, Ti),
Soft straight active power can be controlled to adjust by the proportional integral ring of FLC makes isolated island recover stable.
3. the failure isolated island fast control method of a kind of flexible direct current according to claim 1 and 2, it is characterised in that：
In step (7), in searching offline emergent strategy, corresponding region electrical network is in total active difference Pi, soft directly currently to convey active power
P0, soft straight current maximum active-power P max, be calculated soft straight measure amount and directly perform：
1. in emergent strategy control the Pi that finds with meet soft straight current conveying active-power P0When power direction is identical, i.e., relatively
It is in isolated network and sends or be by fashionable：
As | Pi |≤Pmax- | P0|, then directly specified soft straight active reference value is | P0|+| Pi | and lift direct current；
As | Pi | ＞ Pmax- | P0|, then directly specify soft straight active reference value to be Pmax and lift direct current.
2. in emergent strategy control the Pi that finds with meet soft straight current conveying active-power P0When power direction is contrary, i.e., relatively
In isolated network, one is by fashionable to send one：
When | Pi |≤| P0|, then the soft straight active reference value directly after 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 directly specify soft straight after reversion
Active reference value be | Pi |-| P0| and lift direct current；
As | Pi | ＞ Pmax+ | P0|, then first flexible direct current rapid tidal current is inverted, and directly specify the soft straight active ginseng after reversion
Value is examined for Pmax and direct current is lifted.
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| 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 |
| CN107994598A (en) * | 2017-10-31 | 2018-05-04 | 中国电力科学研究院有限公司 | A kind of alternating current-direct current control method for coordinating 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 |
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| 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 |
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| CN110224446A (en) * | 2019-06-04 | 2019-09-10 | 深圳供电局有限公司 | A kind of receiving end city partial electric grid isolated power grid frequency control apparatus |
| 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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