CN113949074B - Primary frequency modulation optimization control method for new energy power station - Google Patents
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- 230000004044 response Effects 0.000 claims abstract description 81
- 238000010248 power generation Methods 0.000 claims abstract description 55
- 230000009471 action Effects 0.000 claims abstract description 23
- 230000008859 change Effects 0.000 claims abstract description 8
- 230000001960 triggered effect Effects 0.000 claims abstract description 3
- 230000033228 biological regulation Effects 0.000 claims description 11
- 238000003491 array Methods 0.000 claims description 4
- 238000011217 control strategy Methods 0.000 description 4
- 230000003828 downregulation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
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Classifications
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in 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
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention relates to a primary frequency modulation optimization control method of a new energy power station, which comprises the following steps: (1) Dividing all power generation units into two sequences according to the power response speed through a new energy station power quick adjustment test; (2) The primary frequency modulation device in the new energy station monitors the frequency of the bus grid-connected point of the station in real time, the frequency change crosses the dead zone set by the primary frequency modulation of the new energy, the primary frequency modulation response action is triggered, the response action is performed firstly according to the sequence with high power response speed, and then is performed after the slow sequence; (3) The total station power reaches the target value, and the primary frequency modulation response action is ended. The invention can effectively improve the frequency stable supporting capability of the new energy station to the power grid.
Description
Technical Field
The invention belongs to the technical field of large-scale new energy power generation grid connection and operation control, and particularly relates to a primary frequency modulation optimization control method of a new energy power station.
Background
At present, in the power structure of China, the proportion of wind power and photovoltaic power generation is continuously increased, and the rapid development of long-distance ultra-high voltage transmission is provided with higher requirements for the safe operation of a power grid. Under the guidance of two rules in each region, the security operation and auxiliary service policies of the power grid in each region are becoming strict so as to cope with the network and source coordination problems under new situations. The development trend of the new power grid also provides a greater challenge for the frequency stabilization of the power grid, and the space adjustment and the stability efficiency are more flexible, which are the basic requirements for the development of the smart power grid in the future. Primary frequency modulation capability of a generator set is a first important barrier for maintaining power balance and safety and stability of a power grid, and regulation performance of the primary frequency modulation capability plays an important role in dynamic stability of the power grid.
In recent years, new energy power generation has been continuously developed on each regional power grid to participate in primary frequency modulation work of the power grid, so that a frequency modulation control strategy of a new energy unit becomes an important factor for influencing the frequency modulation effect of the power grid. How to reasonably plan and set primary frequency modulation control strategies and parameters has important significance for safe and stable operation of a power grid and optimal scheduling in future intelligent power grid environments.
Disclosure of Invention
The invention aims to provide a primary frequency modulation optimization control method for a new energy power station, so as to effectively improve the frequency stable supporting capability of the new energy power station on a power grid.
The invention adopts the following technical scheme:
a primary frequency modulation optimization control method of a new energy power station comprises the following steps:
(1) Dividing all power generation units into two sequences according to the power response speed through a new energy station power quick adjustment test;
(2) The primary frequency modulation device in the new energy station monitors the frequency of the bus grid-connected point of the station in real time, the frequency change crosses the dead zone set by the primary frequency modulation of the new energy, the primary frequency modulation response action is triggered, the response action is performed firstly according to the sequence with high power response speed, and then is performed after the slow sequence;
(3) The total station power reaches the target value, and the primary frequency modulation response action is ended.
In the step (1) of the primary frequency modulation optimization control method of the new energy power station, a power rapid adjustment test is respectively carried out on each power generation unit in the new energy power station, the power response speed of the power generation units is divided, the power generation units with higher response speed are in sequence 1, and the rest are in sequence 2.
According to the primary frequency modulation optimization control method of the new energy power station, the response speed is faster, namely the power response is started within 0.5s from the frequency step starting time, the power adjustment speed of the photovoltaic power generation unit is greater than 2.5% Pn/s, and the power adjustment speed of the wind power generation unit is greater than 1.5% Pn/s. P (P) n Is the current power generation unit rated capacity.
In the primary frequency modulation optimization control method of the new energy power station, in the step (1), a wind power generation unit is a single fan, and a photovoltaic generation unit is a single photovoltaic array.
In the primary frequency modulation optimization control method of the new energy power station, in the step (2), the dead zone set by the primary frequency modulation of the new energy is 0.05Hz.
In the primary frequency modulation optimization control method of the new energy power station, in the step (2), the primary frequency modulation response action specifically comprises the following steps:
(a) Distributing a power regulation instruction corresponding to the total station frequency response to a power generation unit corresponding to the sequence 1; if the adjustment target of the total station is reached, the primary frequency modulation response action is ended; if the adjustment target of the total station is not reached, setting the power target value of the power generation unit corresponding to the sequence 1 as a current power value, and performing secondary response;
(b) Setting a secondary response power regulation target value, and distributing the target value to the power generation units corresponding to the sequence 2 to complete all primary frequency modulation response actions.
In the primary frequency modulation optimization control method of the new energy power station, the difference value between the power adjustment target value corresponding to the frequency difference and the primary response power adjustment change value is taken as the secondary response power adjustment target value.
In the primary frequency modulation optimization control method of the new energy power station, the secondary response power adjustment target value is immediately transmitted to each power generation unit corresponding to the sequence 2 after the primary response is finished.
In the primary frequency modulation optimization control method of the new energy power station, in the primary frequency modulation response action, the upper frequency modulation strategy is as follows:
P iz ＝max(P imax ,P i )-P i
k-sample photovoltaic array/fan type number corresponding to the ith photovoltaic array/fan;
M k -the number of all template photovoltaic arrays/fans of type number k;
P jmax -the actual active power of the jth template photovoltaic array/fan with type number k;
P it -control target values assigned to each photovoltaic array/fan;
P i -distributing real-time active power of each photovoltaic array/fan during calculation;
P imax -maximum power generated by the photovoltaic array/fan under current lighting/wind sufficiency conditions;
P iz each photovoltaic array/fan can increase the active power value;
ΔP a total station active power adjustment (primary frequency modulation control target value minus whole station real-time active power value).
In the primary frequency modulation optimization control method of the new energy power station, in the primary frequency modulation response action, the frequency modulation strategy is as follows:
P it power objective assigned to each photovoltaic array/fanMarking values;
P i -distributing the active power of each photovoltaic array/fan during calculation;
ΔP a -the active power adjustment of the whole station.
The invention has the beneficial effects that:
1. according to the invention, before the primary frequency modulation control strategy and method are customized, a rapid power adjustment test of the new energy station is performed in advance, and all the power generation units are grouped according to the actual power response capability, so that the frequency modulation supporting capability of different power generation units in the station can be mastered in detail.
2. The power generation unit corresponding to the sequence 1 is preferentially selected to carry out frequency modulation response, high-quality resources in the station are mobilized, the advantage of high power response speed of the sequence 1 is fully exerted, and the power response and regulation speed of the whole station are improved.
3. After the output of the power generation unit in the sequence 1 is finished, the adjustment target cannot be achieved, the difference value between the power adjustment target value corresponding to the frequency difference and the primary response power adjustment change value is taken as a secondary response target value to be sent to the power generation unit in the sequence 2, all resources of the full-field station can be fully utilized to complete all frequency modulation actions, and finally the power response target value is achieved.
4. The power distribution strategy in the primary frequency modulation device of the new energy station adopts different strategies for corresponding power adjustment during up-modulation and down-modulation, and can meet the requirements of quick response under different characteristics of up-modulation and down-modulation.
5. The new energy primary frequency modulation optimization control method is realized without adding and modifying equipment and hardware, only the control strategy and method in the original primary frequency modulation device are required to be modified, and the realization cost of the optimization control method is extremely low.
6. The invention can effectively improve the primary frequency modulation response speed of the new energy station, furthest meet the auxiliary service requirement of the power grid, avoid the assessment loss caused by unqualified primary frequency modulation and improve the comprehensive operation income of the new energy station.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Fig. 2 is a general outline of a photovoltaic region of a photovoltaic power station.
Fig. 3 is a schematic diagram of an inverter and boost integrated device of a certain photovoltaic power station.
Fig. 4 is a schematic view of an angle-adjustable photovoltaic panel of a photovoltaic power plant.
Fig. 5 is a schematic diagram of an active-frequency droop characteristic of a primary frequency modulation function.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
And (I) dividing all power generation units into two sequences according to the power response speed through a new energy station power quick adjustment test.
And respectively carrying out a power quick adjustment test (carrying out a large-amplitude power step response test) on each power generation unit in the new energy station, and verifying the power response capability. The wind power station power generation unit is a single fan, and the photovoltaic power station power generation unit is a single photovoltaic array.
Taking a certain photovoltaic power station as an example, the installed capacity 245MWp of the station adopts a block power generation and centralized grid connection scheme, and the number of the designed years is 1492.12 hours. The photovoltaic field equipment is converged to 9 collecting lines and sent to a booster station, and comprises 116 photovoltaic power generation units and 116 matched box-type transformers.
The specific experimental process is as follows:
the AGC device background of the station is utilized to reduce power of each power generation unit according to 20% rated capacity on the basis of free power generation, power up-regulation and down-regulation instructions are respectively issued once, the down-regulation instruction positions 10% of the rated capacity of the current power generation unit, relevant indexes (response lag time and power regulation speed) are calculated from the instruction issuing time, the response speed is higher (specific indexes are according to the description), and the other indexes are counted into the sequence 2.
The grouping result is as follows:
through test verification, 50 photovoltaic power generation units (mainly taking x as a brand of photovoltaic inverter power generation unit and x as a brand of photovoltaic inverter power generation unit) are counted in the sequence 1, and 66 photovoltaic power generation units (mainly taking x-ray and x-ray as a brand of photovoltaic inverter power generation unit) are counted in the sequence 2.
And (II) a primary frequency modulation device in the new energy station monitors the frequency of the grid-connected point of the station bus in real time, and the frequency change crosses the dead zone set by the primary frequency modulation of the new energy to trigger a primary frequency modulation response action.
(a) Distributing a power regulation instruction corresponding to the total station frequency response to a power generation unit corresponding to the sequence 1; if the adjustment target of the total station is reached, the primary frequency modulation response action is ended; if the adjustment target of the total station is not reached, setting the power target value of the power generation unit corresponding to the sequence 1 as the current power value, and performing secondary response.
Because the new energy station generally does not leave a power up-regulation space, the invention adopts different strategies for corresponding power regulation when up-regulating and down-regulating in the power distribution strategy of the primary frequency modulation device of the new energy station.
The up-tuning strategy is:
P iz ＝max(P imax ,P i )-P i
k-sample photovoltaic array/fan type number corresponding to the ith photovoltaic array/fan;
M k -the number of all template photovoltaic arrays/fans of type number k;
P jmax -the actual active power of the jth template photovoltaic array/fan with type number k;
P it ——control target values distributed to all photovoltaic arrays/fans;
P i -distributing real-time active power of each photovoltaic array/fan during calculation;
P imax -maximum power generated by the photovoltaic array/fan under current lighting/wind sufficiency conditions;
P iz each photovoltaic array/fan can increase the active power value;
ΔP a -the total station active power adjustment.
The down-regulation strategy is:
P it -power target values assigned to each photovoltaic array/fan;
P i -distributing the active power of each photovoltaic array/fan during calculation;
ΔP a -the active power adjustment of the whole station.
Specifically, the pre-test station was active 198.24MW in real time, the analog frequency was set to 50.20Hz by the frequency generating device, and the power to be adjusted down-24.5 MW was calculated by the following active-frequency droop characteristic curve function. And performing primary response according to the frequency modulation strategy, wherein the response lag time is 0.36s, and the real-time active power is 180.36MW after the primary response is finished.
f d -primary frequency modulation dead zone constant value;
f N -system nominal frequency (50 Hz);
P N -rated power of the new energy station;
P 0 -an active power initial value;
delta% -the rate of difference.
The active-frequency droop characteristic of the primary frequency modulation function is shown in fig. 5, in which:
k 1 -primary frequency modulation up-regulating power limit coefficient;
k 2 -primary frequency modulation down-regulating the power limit coefficient;
k min -primary frequency modulation adjusting the total power floor factor.
(b) Setting a secondary response power regulation target value, and distributing the target value to the power generation units corresponding to the sequence 2 to complete all primary frequency modulation response actions.
Taking the difference value of the power adjustment target value corresponding to the frequency difference and the primary response power adjustment change value as a secondary response power adjustment target value.
P IIt ＝P t -P I
P t -the total station frequency modulation corresponds to a power target value;
P I -adjusting the actual value in response to the power at a time;
P IIt -secondarily responding to the power adjustment target value.
And the secondary response power regulation target value is transmitted to each power generation unit corresponding to the sequence 2 at the moment of ending the primary response.
Specifically, according to the strategy setting, the system can send the secondary response adjustment target value-6.62 MW to the power generation unit corresponding to the sequence 2 to complete the total station active response. The response time was 3.64s in total.
Third, the correctness and superiority of the invention are verified by the primary frequency modulation test of the new energy station
The test is carried out without adopting the optimized control method, the response lag time of the test is 0.45s, and the response time is 4.82s.
By analyzing the test results, compared with the primary frequency modulation test results without adopting the optimal control method, the advantage of high adjustment speed of partial power generation units in the station can be utilized on the basis of not sacrificing the overall adjustment amplitude, and the lag time and the adjustment time of the primary frequency modulation response of the whole station are effectively shortened.
Claims (3)
1. A primary frequency modulation optimization control method of a new energy power station is characterized by comprising the following steps:
(1) Dividing all power generation units into two sequences according to the power response speed through a new energy station power quick adjustment test;
respectively carrying out a power rapid adjustment test on each power generation unit in the new energy station, dividing the power generation units according to the power response speed of the power generation units, wherein the power generation units with higher response speed are in a sequence 1, and the rest are in a sequence 2;
the faster response speed means that power response starts within 0.5s from the starting moment of the frequency step, the power adjustment speed of the photovoltaic power generation unit is more than 2.5% Pn/s, and the power adjustment speed of the wind power generation unit is more than 1.5% Pn/s; p (P) n Rated capacity of the current power generation unit;
the wind power generation unit is a single fan, and the photovoltaic power generation unit is a single photovoltaic array;
(2) The primary frequency modulation device in the new energy station monitors the frequency of the bus grid-connected point of the station in real time, the frequency change crosses the dead zone set by the primary frequency modulation of the new energy, the primary frequency modulation response action is triggered, the response action is performed firstly according to the sequence with high power response speed, and then is performed after the slow sequence; the dead zone set by the primary frequency modulation of the new energy is 0.05Hz;
the primary frequency modulation response action specifically comprises the following steps:
(a) Distributing a power regulation instruction corresponding to the total station frequency response to a power generation unit corresponding to the sequence 1; if the adjustment target of the total station is reached, the primary frequency modulation response action is ended; if the adjustment target of the total station is not reached, setting the power target value of the power generation unit corresponding to the sequence 1 as a current power value, and performing secondary response;
(b) Setting a secondary response power regulation target value, and distributing the target value to the power generation units corresponding to the sequence 2 to complete all primary frequency modulation response actions;
in the primary frequency modulation response action, the up-modulation strategy is:
P iz ＝max(P imax ,P i )-P i
k-sample photovoltaic array/fan type number corresponding to the ith photovoltaic array/fan;
M k -the number of all template photovoltaic arrays/fans of type number k;
P jmax -the actual active power of the jth template photovoltaic array/fan with type number k;
P it -control target values assigned to each photovoltaic array/fan;
P i -distributing real-time active power of each photovoltaic array/fan during calculation;
P imax -maximum power generated by the photovoltaic array/fan under current lighting/wind sufficiency conditions;
P iz each photovoltaic array/fan can increase the active power value;
ΔP a -total station active power adjustment;
(3) The total station power reaches the target value, and the primary frequency modulation response action is finished;
taking the difference value of the power adjustment target value corresponding to the frequency difference and the primary response power adjustment change value as a secondary response power adjustment target value.
2. The primary frequency modulation optimization control method of a new energy power station according to claim 1, wherein the secondary response power adjustment target value is issued to each power generation unit corresponding to the sequence 2 immediately after the primary response is finished.
3. The primary frequency modulation optimization control method of a new energy power station according to claim 1, wherein in the primary frequency modulation response action, the frequency modulation strategy is:
P it -power target values assigned to each photovoltaic array/fan;
P i -distributing the active power of each photovoltaic array/fan during calculation;
ΔP a -the active power adjustment of the whole station.
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| CN105978043A (en) * | 2016-06-21 | 2016-09-28 | 天津大学 | Multi-inverter active power control method for photovoltaic power station |
| WO2018205315A1 (en) * | 2017-05-11 | 2018-11-15 | 南京南瑞继保电气有限公司 | Rapid power coordination control method for new energy station to participate in primary frequency regulation |
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| CN111555307A (en) * | 2020-04-29 | 2020-08-18 | 云南电网有限责任公司电力科学研究院 | Method for photovoltaic power station to participate in regional power grid frequency adjustment |
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| CN105978043A (en) * | 2016-06-21 | 2016-09-28 | 天津大学 | Multi-inverter active power control method for photovoltaic power station |
| WO2018205315A1 (en) * | 2017-05-11 | 2018-11-15 | 南京南瑞继保电气有限公司 | Rapid power coordination control method for new energy station to participate in primary frequency regulation |
| CN110854881A (en) * | 2019-11-29 | 2020-02-28 | 长沙理工大学 | Method for participating in primary frequency modulation by combining energy storage and photovoltaic rapid control |
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