CN104242302A - Coordinated control method for frequency modulation of large-scale electric automobile auxiliary power grid - Google Patents
Coordinated control method for frequency modulation of large-scale electric automobile auxiliary power grid Download PDFInfo
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- CN104242302A CN104242302A CN201410428702.XA CN201410428702A CN104242302A CN 104242302 A CN104242302 A CN 104242302A CN 201410428702 A CN201410428702 A CN 201410428702A CN 104242302 A CN104242302 A CN 104242302A
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Abstract
The invention discloses a coordinated control strategy for frequency modulation of a large-scale electric automobile auxiliary power grid. According to the coordinated control strategy for frequency modulation of the large-scale electric automobile auxiliary power grid, power grid operating states are divided into five types, namely a normal state, an early warning state, an emergency state, an ultimate state and a recovery state. According to the practical situation of a power grid and by combining the advantage of accurate and rapid response of an electric automobile, reasonable response control strategies are made to adapt to different operating states, so that the purpose of coordinated response between the electric automobile and a power grid frequency modulation device is achieved. The control strategies correspond to different response thresholds and response range values according to the disturbance intensity of the power grid, and the change trend of the frequency of the power grid can be judged and the response strategies can be dynamically adjusted according to frequency deviation signals of the power grid.
Description
Technical field
The present invention relates to the control method for coordinating that power grid frequency modulation assisted by a kind of extensive electric automobile.
Background technology
The problem such as environmental pollution and energy crisis that a large amount of consumption of petroleum resources bring; become the focus that countries in the world are paid close attention to; electric automobile has been pushed to the stage of history by energy-saving and emission-reduction and energy development, developing rapidly as ensureing that the stable operation of electric power system provides new method of electric automobile.The unordered access electrical network of a large amount of electric automobile Stochastic sum will certainly increase the load level of system, causes partial electric grid load supply nervous, brings negative impact to electrical network.But the development with energy storage technology, electric motor and controller technology makes electric automobile be not only the taker of electric power, but one can provide pressure regulation, frequency modulation, spinning reserve for electrical network, the active participant of auxiliary electrical network operation.Along with V2G(vehicle-to-grid) development of technology, electric automobile participates in power grid frequency modulation, the research realizing intelligent demand response aspect have also been obtained constantly deeply, and the advantage that V2G has it not replace relative to traditional mode of frequency regulation, is considered to the choosing of the best of following frequency modulation.
At present, study V2G and participate in the feasibility major embodiment of power grid frequency modulation in the following areas:
(1) electric automobile has entered the all-round popularization stage in worldwide.According to statistics, under medium development speed, to 2020,2030 and the year two thousand fifty, the ratio that electric automobile accounts for american car total amount will reach 35%, 51% and 62% respectively.China expects the year two thousand thirty, and electric automobile quantity will rise to 6,000 ten thousand.Each charging electric vehicle power is pressed 10kW and is calculated, and under most extreme case, 6,000 ten thousand electric automobiles charge simultaneously, then total charge power will reach 600,000,000 kilowatts, accounts for 26% of the year two thousand thirty whole nation expectation total installation of generating capacity 23.2 hundred million kilowatts.
(2) can regulate according to the charging and discharging state of power system frequency deviation to electric automobile.When system frequency declines, the power that fills reducing electric automobile reaches the object reducing system loading, even can to electrical network feed to increase amount of power supply when system frequency suppression ratio is more serious; When system frequency rises, control the charging of electric automobile maximum power to increase system loading.
(3) electric automobile charge and discharge process is the process of electromagnetism and chemical reaction, mechanical process, so it can carry out continuous response to power network signal, and response accurately fast, the meritorious deposit of the system that decreases to a certain extent.
(4) within the relatively short time, electric automobile discharge and recharge is nonrigid, and namely the charging electric vehicle time is relatively more flexible, and regulate electric automobile charging and discharging state or power at short notice affects smaller on user and electric automobile simultaneously.
Summary of the invention
The present invention mainly studies the cooperation control between extensive electric automobile and conventional rack frequency modulation, study corresponding control strategy, one is provided to respond fast when mains frequency occurs abnormal and to adjust charging and discharging state, auxiliary electrical network recovers normal operating level fast, ensures the control method of the safety and stability of electrical network.
Technical scheme of the present invention comprises:
The invention has the beneficial effects as follows: be five kinds by operation of power networks state demarcation: normal condition, alert status, emergency rating, limiting condition and returning to form, according to electrical network actual conditions, and formulate rational response limiting strategy in conjunction with the advantage that electric automobile accurately responds rapidly for different running statuses, reach the object of coordinate responses between electric automobile and power grid frequency modulation device.In the present invention, each control strategy is according to the corresponding different response threshold of the disturbance size of electrical network and response amplitude value, and can judge its variation tendency according to mains frequency deviation signal, dynamic conditioning response policy.Can respond fast when mains frequency occurs abnormal and adjust charging and discharging state, auxiliary electrical network recovers normal operating level fast, ensures the safety and stability of electrical network.
Accompanying drawing explanation
Fig. 1 is that the hardware of whole system of the present invention is formed, the implementation schematic diagram of information flow and strategy;
Fig. 2 is the concrete implementing procedure block diagram of electric automobile of the present invention and conventional rack cooperation control;
Fig. 3 is that power grid frequency modulation flow chart assisted by electric automobile of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
With reference to accompanying drawing 1, power distribution network control centre is responsible for carrying out Real-Time Monitoring and division to operation states of electric power system, in extensive interconnected systems
aGCthe important means that control system frequency and interregional Tie line Power are run according to plan, order wire frequency Deviation Control (
tBC) be more rational FREQUENCY CONTROL pattern during bulk power grid runs.In this mode using frequency departure and the work of dominant eigenvalues deviation as district control deviation (
aCE) amount of calculation.If electrical network meets with disturbance, then pass through
aGCdetect and judge operation of power networks state, frequency and power difference, power division is carried out under the cooperation of coordination control strategy, and by electrical network correlated communication equipment, allocation result is passed to the relevant device (electric automobile or traditional frequency modulation unit) participating in frequency response, and respond.
Hardware components in Fig. 1 is based upon on the existing theory to the research of electric automobile frequency modulation, substantially someone carried these devices, but domestic concrete enforcement in this regard is not set up substantially at present, but these facilities can realize in the practical application in future.The emphasis of this research is control strategy, so control strategy is just applied to whole system by whole research, jointly controls thus reach the object of cooperation control with conventional rack.
1, the present invention is based on the development of current electrical network and electric automobile correlation technique, (normal condition, alert status, the state of emergency are analyzed and divided to the running status of electrical network, limiting condition and return to form), and for different running statuses, corresponding control strategy is proposed:
(1) as district control deviation (Area Control Error
aCE) smaller, when not constituting a threat to electrical network, consider the impact of frequency adjustment on electric automobile user and battery life, now electric automobile does not participate in frequency response, is completed by traditional mode of frequency regulation;
(2) when electrical network is subject to large disturbances, cause
aCEbecome large in short time, now electric automobile relies on it to respond advantage rapidly and accurately, preferential answering, thus guarantees the equilibrium of supply and demand of electric energy;
(3) when electrical network is subject to a serious disturbance, electrical network is caused to enter abnormal running status,
aCEbigger than normal, now electric automobile rely on its advantage first respond the several seconds, then traditional automatic power-generating controller for use (
automatic Generating Control, AGC) combine response, until after power system restoration normal operating condition, electric automobile returns to the charged state before response.
Wherein, response policy (1) corresponding normal condition, response policy (2) the corresponding state of alert, response policy (3) is corresponding urgent, the limit and returning to form.
2, often kind of tactful concrete response is studied:
The responsive measures that often kind of strategy is corresponding different, concrete response condition is as follows:
(1) normal condition:
Suppose electrical network generation microvariations, and cause frequency departure
Δ f, but now electrical network be still in normal operating condition (
aCEvery little).When
aCEwhen reaching response threshold, as:
(1)
Wherein
(2)
In formula,
f t with
f n electrical network measures power and rated power in real time respectively,
with
be respectively electrical network practical frequency deviation and the limits of error,
aCE set for
aCEthe absolute value of maximum permissible value,
for total dominant eigenvalues,
bfor system frequency deviation coefficient.
In order to reduce
aCEand system frequency deviation, consider the impact of frequency adjustment on electric automobile user and battery life, now electric automobile does not participate in frequency response, is completed by traditional mode of frequency regulation.According to electrical network demand, response threshold should be set to:
(3)
Now
aGCregulating power is:
(4)
If
e aCE for just, unit power output will reduced; If
e aCE its power output will be increased for negative.
In formula,
aCE dz for
aCEresponse dead band,
e aCE the demand power that frequency response is total.
(2) state of alert:
Under the state of alert, mains frequency and voltage still operate in the permitted maximum range, and simultaneity factor will be that the generation of abnormal operating condition is ready in advance.Now, there is comparatively large disturbances in electrical network, causes
aCEbigger than normal in short time, now electric automobile relies on it to respond advantage rapidly and accurately, preferential answering, thus guarantees the equilibrium of supply and demand of electric energy.Its response threshold is:
(5)
If
, the regulating power of electric automobile is:
（6）
If
aCE>
aCE aset_EV , electric automobile regulating power is:
（7）
In formula (5), ACE
aset_EVfor the response threshold of electric automobile under alert status,
Δ awith
Δ f a be respectively
aCEdeviation and exemplary frequency deviation values;
In formula (6) (7), P
ade-EVfor the charge power that electric automobile reduces, P
(max) de-EVallow by electric automobile reduce maximum gross power, P
ach-EVfor the charge power that electric automobile increases, P
ach(max)-EVallow by electric automobile increase maximum gross power.
(3) urgent, the limit and returning to form:
When electrical network is subject to a serious disturbance, electrical network is caused to enter abnormal running status, ACE is bigger than normal, now electric automobile relies on its advantage first to respond the several seconds, then traditional automatic power-generating controller for use (Automatic Generating Control, AGC) combine response, until after power system restoration normal operating condition, electric automobile returns to the charged state before response.Now, arranging electric automobile response threshold is:
（8）
If
, electric automobile responding power is:
（9）
If
aCE>ACE cset_EV , electric automobile responding power is:
(10)
In formula (8)
aCE cset_EV for electric automobile response threshold under this strategy,
Δ bwith
Δ f b be respectively ACE and frequency departure;
In formula (9), P
edis-EVfor electric automobile discharge power, P
(max) dis-EVfor the maximum permission discharge power of total electric automobile;
In formula (10), Pech-EV be electric automobile increase charge power, P(max) ch-EV allow by total electric automobile increase maximum charge power.
Certainly, the above-mentioned adjustment of charge-discharge electric power also will consider the constraint of the power, state-of-charge etc. of electric automobile self.
Fig. 2 is the specific implementation process that in Fig. 1, power grid frequency modulation assisted by electric automobile, and the interaction between refinement each several part, designates the direction of wherein information flow and energy flow.In figure, extensive charging control system of electric automobile is the interaction center of electrical network and electric automobile information, by the information (state-of-charge of database to each electric automobile
sOC, free time etc.) carry out dynamic realtime collection, to detect mainly through the information of charging device of electric automobile to the electric automobile networked, and by information feed back to control centre.
Every part in Fig. 2 is a concrete control unit in figure mono-in corresponding module, and such as, WAMS is the significant element that control centre carries out information gathering feedback; Extensive charging control system of electric automobile is a concrete operations unit of electric automobile charging station control centre.
In Fig. 2, coordination control strategy refers to the particular content of in the present embodiment first.
With reference to accompanying drawing 3, when system stable operation is damaged, first grid dispatching center monitoring device detects system exception state, and judges this state, judges
aCEwhether reach response threshold value (this part is realized by the WAMS of grid dispatching center), if reach a certain response threshold value control centre according to feed back
eVsinformation is to the transmitted power adjusting command of Control of Electric Vehicles center, otherwise electric automobile keeps normal charging condition,
eVscontrol centre determines quantity and the state of available electric automobile after receiving relevant information, and discharge and recharge adjustment is carried out to each electric automobile, judge whether electric automobile reaches constrained simultaneously, if do not reach, continue response until power system restoration normal condition position, otherwise terminate discharge and recharge.
Claims (7)
1. the control method for coordinating of power grid frequency modulation assisted by an extensive electric automobile, existing power distribution network control centre and communication network is utilized to carry out cooperation control to frequency response object, it is characterized in that, it is five kinds by operation of power networks state demarcation: normal condition, alert status, emergency rating, limiting condition and return to form, according to electrical network actual conditions, and formulate rational response limiting strategy in conjunction with the advantage that electric automobile accurately responds rapidly for different running statuses, reach the object of coordinate responses between electric automobile and power grid frequency modulation device.
2. the control method for coordinating of power grid frequency modulation assisted by extensive electric automobile according to claim 1, it is characterized in that, described normal condition is: district control deviation
aCE(Area Control Error) is smaller, and when not constituting a threat to electrical network, consider the impact of frequency adjustment on electric automobile user and battery life, now electric automobile does not participate in frequency response, is completed by traditional mode of frequency regulation.
3. the control method for coordinating of power grid frequency modulation assisted by extensive electric automobile according to claim 1, it is characterized in that, described alert status is: electrical network is subject to large disturbances, causes
aCEbecome large in short time, now electric automobile relies on it to respond advantage rapidly and accurately, preferential answering, thus guarantees the equilibrium of supply and demand of electric energy.
4. the control method for coordinating of power grid frequency modulation assisted by extensive electric automobile according to claim 1, it is characterized in that, described urgent, the limit and return to form for: electrical network is subject to a serious disturbance, causes electrical network to enter abnormal running status,
aCEbigger than normal, now electric automobile relies on its advantage first to respond the several seconds, then traditional automatic power-generating controller for use
aGC(
automatic Generating Control) combine response, until after power system restoration normal operating condition, electric automobile returns to the charged state before response.
5. the control method for coordinating of power grid frequency modulation assisted by the extensive electric automobile described according to claim 2,3 or 4, and it is characterized in that, electric automobile is with district control deviation
aCEresponsively signal, regulates charging and discharging state or power.
6. the control method for coordinating of power grid frequency modulation assisted by extensive electric automobile according to claim 1, it is characterized in that, according to the difference of operation of power networks state, the response threshold of often kind of response policy and amplitude are also different.
7. the control method for coordinating of power grid frequency modulation assisted by extensive electric automobile according to claim 1, it is characterized in that, can according to system
aCEthe threshold value of the variation tendency dynamic conditioning response policy of signal, if namely
aCEbe a process progressively declined, the threshold value of relative strategy may change thereupon, to contain downward trend.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106891764A (en) * | 2017-03-01 | 2017-06-27 | 杭州杰能动力有限公司沈阳分公司 | A kind of electric automobile complementation charging method |
| CN107359625A (en) * | 2017-07-21 | 2017-11-17 | 中国南方电网有限责任公司 | A kind of charging device of electric automobile and method with dynamic frequency function |
| CN107706910A (en) * | 2017-09-28 | 2018-02-16 | 广西大学 | A kind of real-time scheduling method of mains frequency regulation |
| CN110062988A (en) * | 2016-11-01 | 2019-07-26 | 本田技研工业株式会社 | Server unit and control method |
| CN110380440A (en) * | 2019-08-19 | 2019-10-25 | 阳光电源股份有限公司 | A kind of fire storage system and its energy-storage system AGC frequency modulation method and device |
| CN112865152A (en) * | 2021-01-20 | 2021-05-28 | 吉林省电力科学研究院有限公司 | Energy storage-unit combined frequency modulation control method for maintaining battery SOC |
-
2014
- 2014-08-28 CN CN201410428702.XA patent/CN104242302A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| JIN ZHONG 等: "coordinated control for large-scale EV charging facilities and energy storage devices participating in frequency regulation", 《APPLIED ENERGY》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110062988A (en) * | 2016-11-01 | 2019-07-26 | 本田技研工业株式会社 | Server unit and control method |
| CN110062988B (en) * | 2016-11-01 | 2022-10-04 | 本田技研工业株式会社 | Server device and control method |
| CN106891764A (en) * | 2017-03-01 | 2017-06-27 | 杭州杰能动力有限公司沈阳分公司 | A kind of electric automobile complementation charging method |
| CN107359625A (en) * | 2017-07-21 | 2017-11-17 | 中国南方电网有限责任公司 | A kind of charging device of electric automobile and method with dynamic frequency function |
| CN107359625B (en) * | 2017-07-21 | 2020-05-15 | 中国南方电网有限责任公司 | Electric automobile charging device and method with dynamic frequency modulation function |
| CN107706910A (en) * | 2017-09-28 | 2018-02-16 | 广西大学 | A kind of real-time scheduling method of mains frequency regulation |
| CN107706910B (en) * | 2017-09-28 | 2020-08-07 | 广西大学 | Real-time scheduling method for power grid frequency adjustment |
| CN110380440A (en) * | 2019-08-19 | 2019-10-25 | 阳光电源股份有限公司 | A kind of fire storage system and its energy-storage system AGC frequency modulation method and device |
| CN110380440B (en) * | 2019-08-19 | 2021-06-11 | 阳光电源股份有限公司 | Fire storage system and energy storage system AGC frequency modulation method and device thereof |
| CN112865152A (en) * | 2021-01-20 | 2021-05-28 | 吉林省电力科学研究院有限公司 | Energy storage-unit combined frequency modulation control method for maintaining battery SOC |
| CN112865152B (en) * | 2021-01-20 | 2022-12-09 | 吉林省电力科学研究院有限公司 | Energy storage-unit combined frequency modulation control method for maintaining battery SOC |
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Application publication date: 20141224 |