CN112600225B - Control method and system for primary frequency modulation of wind storage system - Google Patents
Control method and system for primary frequency modulation of wind storage system Download PDFInfo
- Publication number
- CN112600225B CN112600225B CN202011469275.1A CN202011469275A CN112600225B CN 112600225 B CN112600225 B CN 112600225B CN 202011469275 A CN202011469275 A CN 202011469275A CN 112600225 B CN112600225 B CN 112600225B
- Authority
- CN
- China
- Prior art keywords
- energy storage
- power
- storage unit
- wind
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H02J3/241—The oscillation concerning frequency
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a control method and a control system for primary frequency modulation of a wind storage system, which belong to the technical field of electrical engineering. The bottom layer control ensures the normal operation of the fan and the energy storage system, and the upper layer control adjusts the power distribution of the fan and the energy storage system: the energy storage equipment is ensured to be capable of adjusting the energy storage frequency modulation power output in real time according to different capacities of the energy storage equipment based on power consistency control; and adjusting the reference power of the DFIG network side converter based on an SoC consistency protocol, and ensuring that all energy storage equipment adjusts the output of the DFIG network side converter according to the SoC on the premise of simultaneously charging and discharging. Therefore, the wind power station can effectively adjust the wind storage output power in real time to stabilize the frequency and ensure the stable operation of the wind power station.
Description
Technical Field
The invention belongs to the technical field of electrical engineering, and particularly relates to a control method and a control system for primary frequency modulation of a wind storage system.
Background
In recent years, energy storage has been rapidly developed and applied. In a power system containing wind power, the energy storage auxiliary system is utilized for frequency adjustment to realize energy storage absorption and active power release, and the system has stable performance, flexible control and quick response. Therefore, the wind power generation set or the wind power plant is configured with energy storage with certain capacity by utilizing the self adjusting capacity of the wind power generation set, the frequency adjusting process of the system participated by the wind power generation set can be assisted, and the problem of secondary reduction of the system frequency caused by inertia control of a rotor of the wind power generation set can be avoided.
When a plurality of energy storage units are installed in a distributed wind power plant, the coordinated operation of a wind turbine generator and energy storage needs to be ensured. For the wind storage system to participate in primary frequency modulation of a power grid, active power control is a key loop, however, the existing active control method is mainly centralized, and it is assumed that wind speed conditions of the whole wind power plant and energy storage information of a wind turbine can be used by a central controller, so that the system is broken down due to single-point communication faults. The consistency control only utilizes adjacent information exchange between local controllers to achieve a global control target, and the reliability is higher compared with centralized control. For a system under a mode of combining a wind driven generator and an energy storage unit in a one-to-one mode, the current distributed wind energy storage system realizes real-time sharing of load power between a fan and energy storage, but the difference of characteristics such as capacity and state of charge (SoC) between different energy storage units is rarely considered, so that the charge and discharge capacity of the energy storage system is not fully utilized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a control method and a control system for primary frequency modulation of a wind storage system, and aims to solve the problem of poor power distribution characteristics in the primary frequency modulation process of the conventional wind storage system.
In order to achieve the above object, in one aspect, the present invention provides a control method for primary frequency modulation of a wind storage system, including the following steps:
(1) according to the frequency deviation of the system, the output active power demand P required by the energy storage system is obtained through a primary frequency modulation link d ；
(2) Based on the active power demand P d Calculating the output power reference consistency state variable z of the ith group of energy storage units i And according to the rated capacity C of the energy storage unit bat,i Determining the reference value P of the output power of the energy storage unit es,i ；
(3) According to the state of charge SoC of the ith group of energy storage units i Rated capacity C bat,i And the output power P bati Calculating a state variable x of consistency of the energy storage unit SoC i ；
(4) X is to be i After the inter-adjacent error terms are subjected to weighted summation, a corrected value P of the reference power of the energy storage unit is obtained through a PI (proportional integral) controller SoC,i ；
(5) DFIG stator active power P of doubly-fed asynchronous wind generator s,i And rotor active power P r,i Difference value of (1), reference power correction value P of energy storage unit SoC,i And a reference value P of the output power of the energy storage unit es,i Adding to obtain the DFIG network side output active power reference value P of the wind driven generator netref,i ；
(6) The grid-side converter enables the DFIG grid side of the wind driven generator to output active power P through dq decoupling control net,i Following the active power reference value P netref,i 。
Further, the step (1) specifically comprises:
sampling the global information quantity of the power grid frequency according to the change condition of the comprehensive load, and acquiring the output active power demand P required by the energy storage system through P/f droop control and inertia control d (ii) a Wherein the content of the first and second substances,
K df is a differential weight coefficient of the frequency deviation, K pf Droop coefficient which is frequency deviation; f ═ f ref -f is the system frequency deviation, wherein f ref The reference frequency of the power grid is 50Hz, and f is the actual frequency of the power grid.
Further, in step (2), the output power is referenced to the state variable z of consistency i Derived by the leader-follower consistency protocol:
leader equation:
follower equation:
the wind turbine generator set total set is represented by N, the No. 1 wind turbine is selected as a leader, and the leader is used
Set of description followers, a ij Reflecting the communication weight of the communication link;
reference value P of output power of energy storage unit es,i And a state variable z i The following relationship is satisfied:
wherein, K i The power is divided into coefficients
n is the total number of energy storage cells, C bat,i Is the rated capacity of the energy storage unit i; and N represents the total set of wind turbines.
Further, in the step (3),
wherein the content of the first and second substances,
and a and b are respectively the lower limit and the upper limit of the state of charge of the energy storage unit in normal operation.
Further, in the step (4),
wherein, K PSoC,i And K ISoC,i Proportional gain and integral gain of the PI controller, a ij For the communication weight, N represents the total set of wind turbines.
Further, the wind storage system comprises a stator-side converter and a grid-side converter, wherein,
the stator side converter realizes decoupling control of active power and reactive power of a DFIG stator of the wind driven generator through stator flux linkage directional vector control;
and the grid-side converter realizes decoupling control of the active power output by the grid side of the wind driven generator DFIG and the reactive power of a grid-side converter loop through grid voltage directional vector control.
Further, the energy storage unit controls the direct-current side voltage of the wind driven generator DFIG through a voltage and current double closed loop, so that the wind driven generator DFIG shortage power required by the primary frequency modulation is compensated by stabilizing the direct-current side voltage of the wind driven generator DFIG.
In another aspect, the present invention provides a control system for primary frequency modulation of a wind storage system, including:
the primary frequency modulation module is used for acquiring the output active power demand P required by the primary frequency modulation of the energy storage system according to the system frequency deviation d ；
An energy storage unit output power reference value determination module for determining the active power demand P based on the output power reference value d Calculating the output power reference consistency state variable z of the energy storage unit i And according to the rated capacity C of the energy storage unit bat,i Determining the reference value P of the output power of the energy storage unit es,i ；
The energy storage unit consistency state variable determination module is used for determining the state of charge (SoC) of the ith group of energy storage units according to i Rated capacity C bat,i And the output power P bati Calculating a state variable x of consistency of the energy storage unit SoC i ；
The energy storage unit reference power correction value determining module is used for determining x i After the inter-adjacent error terms are subjected to weighted summation, a corrected value P of the reference power of the energy storage unit is obtained through a PI (proportional integral) controller SoC,i ；
The DFIG network side output active power reference value determining module is used for determining the active power P of a DFIG stator of the doubly-fed asynchronous wind generator s,i And rotor active power P r,i Difference value of (1), reference power correction value P of energy storage unit SoC,i Reference value P of output power of energy storage unit es,i Adding to obtain the DFIG network side output active power reference value P of the wind driven generator netref,i ；
The DFIG converter control module is used for decoupling control of the grid-side converter through dq so that the wind driven generator DFIG grid side outputs active power P net,i Following the active power reference value P netref,i 。
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) the invention ensures that the energy storage unit can adjust the output of the energy storage unit in real time according to different capacities based on power consistency control; meanwhile, the energy storage output power is corrected based on an energy storage unit SoC consistency protocol, and then the reference power of the DFIG network side converter is corrected, so that the output of all energy storage unit groups is further adjusted according to the SoC size on the premise of simultaneously charging and discharging. Therefore, the method can effectively realize the primary frequency modulation of the wind storage system to the power grid in real time and ensure the stable operation of the wind power plant.
(2) The invention considers the difference between the capacity of the energy storage units and the SoC, dynamically adjusts the active power output of the wind power plant according to the change of the SoC, and ensures that the SoC gradually tends to be consistent, thereby avoiding the circulating current among a plurality of energy storage units and effectively preventing the energy storage units from being overcharged or deeply discharged. Meanwhile, each energy storage unit reasonably shares load under the initial state that the capacity and the SoC are different, so that the capacity of the energy storage unit can be fully utilized.
Drawings
FIG. 1 is a schematic diagram of a main topology of a wind storage power generation system provided by an embodiment;
FIG. 2 is a schematic diagram of a bottom-layer vector control strategy of the doubly-fed wind generator provided by the embodiment;
FIG. 3 is a schematic diagram of an energy storage system topology provided by an embodiment;
FIG. 4 is a schematic diagram of a control method of an energy storage system controller according to an embodiment;
FIG. 5 is a schematic view of a communication topology of a wind storage power generation system according to an embodiment;
FIG. 6 is a schematic diagram of primary frequency modulation hierarchical control of a wind storage power generation system provided by the embodiment;
FIG. 7 is a frequency comparison graph of the primary frequency modulation of the wind storage system and the independent frequency modulation of the fan when the wind speed is constant, which is provided by the embodiment;
fig. 8(a) and 8(b) are simulation diagrams of the output power of the energy storage system and the SoC provided by the embodiment, respectively;
fig. 9(a) to 9(c) are simulation diagrams of the grid frequency conversion condition, the energy storage system output power and the SoC when the battery 4 fails according to the embodiment;
FIG. 10 is a frequency comparison graph of the primary frequency modulation of the wind storage system and the individual frequency modulation of the wind turbine when the wind speed changes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a control method for primary frequency modulation of a wind storage system, which comprises the following steps:
(1) the wind stores up system bottom layer control includes: double-fed asynchronous wind power generator (DFIG) directional vector control and Energy Storage System (ESS) voltage and current double closed-loop control;
(2) the wind stores up the upper control of system and includes: the method comprises an ESS output power calculation strategy based on a power consistency protocol and a grid-side converter reference power adjustment strategy based on an energy storage unit state of charge (SoC) consistency protocol.
As shown in fig. 1, the topological structure of the wind storage system provided by the present invention includes four subsections, namely, a double-fed asynchronous wind power generator DFIG, an energy storage system ESS, a large power grid, and a comprehensive load.
As shown in fig. 2, the DFIG directional vector control includes:
(1.1) the stator side converter controls the stator to output active power and reactive power, the reference rotor dq axis voltage is obtained through a stator flux linkage directional vector control method, and then the active power P of the DFIG stator is achieved s And reactive power Q s The decoupling control of (2);
(1.2) the grid-side converter controls grid-connected active power and grid-side converter loop reactive power, the grid-side converter obtains dq-axis reference voltage through grid voltage directional vector control, and then DFIG grid-side output active power P is achieved net Reactive power Q of sum network side converter loop sr The decoupling control of (1).
The energy storage system topology is shown in fig. 3, the control strategy is shown in fig. 4, and the underlying ESS control method comprises the following steps: the energy storage system is controlled through double closed-loop control, and then the voltage V on the direct current side of the fan is stabilized dc DC/DC conversionThe device can conveniently realize bidirectional exchange of power.
As shown in fig. 5, both the DFIG and the ESS devices are regarded as independent nodes to construct a wind storage system communication topology, two communication networks are established between the DFIG and the ESS, and bidirectional communication is performed between the DFIG and the ESS devices to provide a consistency method and a system for primary frequency modulation control of the wind storage system.
As shown in fig. 6, a wind storage system primary frequency modulation hierarchical control framework based on a consistency protocol is established. Firstly, a main control layer of the DFIG adopts directional vector control; then, according to the change condition of the comprehensive load, sampling the global information quantity of the power grid frequency, and obtaining the output active power demand P required by the energy storage system through P/f droop control and inertia control links d ：
K df A differential weight coefficient being a frequency deviation; k pf Droop coefficient which is frequency deviation; f ═ f ref -f is the system frequency deviation, where f ref The reference frequency of the power grid is 50Hz, and f is the actual frequency of the power grid.
The upper layer control initially realizes active power sharing among the energy storage systems by using a power consistency protocol; then, the energy storage output reference power value is corrected according to the energy storage unit SoC consistency protocol, and the network side output reference active power P is dynamically adjusted netref And outputting an active power reference value as the DFIG network side. The method comprises the following concrete steps:
first, a power consistency protocol-based ESS output power value calculation strategy is proposed.
Defining an output power reference consistency variable z for the ith group of wind storage devices i According to the active power demand P of the energy storage system d All z are made based on a coherency protocol i The consistency is achieved between them.
On the premise of no loss of generality, the total set of wind generation sets is represented by N, and the No. 1 wind turbine is selected as a leader and used
A set of followers is described. The proposed leader-follower consistency protocol is described by the following equation. According to the basic knowledge of graph theory, directed graphs are usually represented as
Where v is a finite number of non-empty node sets,
for a set of node ordered pairs, called an edge set, the adjacency matrix is A N ＝[a ij ]∈R N×N . If node v i Can acquire v j Is then a ij >0, otherwise a ij ＝0。a ij Is reflective of the communication weight of the communication link.
Leader equation:
follower equation:
each wind storage unit can communicate with two neighbors of the wind storage unit, and the No. 1 wind turbine of the leader receives active demand P of a relevant reference energy storage system from a wind power plant monitor d And updates the state variable z by the leader equation 1 . At the same time, the leader will agree on a variable z 1 Transmitting to its neighbors, each follower j receiving the consistency variable from its neighbors and transmitting the variable to its neighbors, updating its corresponding z by follower equations j 。
Further, when the ESS capacities in the wind storage system are different, the required active power should be distributed proportionally according to their capacity ratings, and the higher capacity energy storage device should distribute more active power than the lower capacity energy storage deviceAnd (4) loading. Defining power distribution coefficients
Where n is the total number of energy storage cells, C bat,i Is the rated capacity of the ith group of energy storage units.
The consistency variable z obtained from the above 1 The reference value of the energy storage output power can be obtained, so that the energy storage output power P es,i Dynamic tracking of a consistency variable z by volume ratio i 。
Therefore, the output of each group of energy storage equipment can be allocated in proportion according to the rated capacity of the energy storage equipment.
Further, for the optimization of the working characteristics of the energy storage unit, a network side converter reference power adjustment strategy based on an energy storage unit SoC consistency protocol is provided.
According to SoC of ith group of energy storage units in energy storage unit i Calculating the state variable x of the energy storage unit according to the sampling values of the rated capacity and the output power of the energy storage unit i ：
Wherein, P bati 、i bati 、v bati And C bati The output power, the current, the voltage and the capacity of the ith group of energy storage units are respectively. F is to be SoCi Is defined as:
wherein, SoC i Is the state of charge of the i-th group of energy storage units, and a and b are the lower limit and the upper limit of the state of charge of the energy storage units in normal operation, respectively, and preferably, a is 0.4 and b is 0.9.
Adopting a PI controller to enable the ith energy storage unit to be singleIn the meta will x i The energy storage reference power correction value P can be obtained through the PI controller SoC,i ：
Wherein, K PSoC,i And K ISoC,i Respectively, the proportional gain and the integral gain of the PI controller.
Actual dynamic output power P 'of the ith group of energy storage units' es,i Should equal the preliminarily obtained reference value P of the energy storage output power es,i And a stored energy reference power correction value P SoC,i And (3) the sum:
P′ es,i ＝P es,i +P SoC,i
according to the topological structure of the DFIG, the wind turbine network side outputs active power P net,i Comprises the following steps:
obtaining the DFIG network side output active power reference value P netref,i Comprises the following steps:
according to the DFIG bottom-layer vector control, the DFIG network side can output active power P net,i Outputting an active power reference value P along with the DFIG network side netref,i The power allocation target can be completed.
In another aspect, the present invention provides a control system for primary frequency modulation of a wind storage system, including:
the primary frequency modulation module is used for acquiring the output active power demand P required by the primary frequency modulation of the energy storage system according to the system frequency deviation d ；
An energy storage unit output power reference value determination module for determining the active power demand P based on the output power reference value d Calculating the output of the energy storage unitPower reference coherency state variable z i And according to the rated capacity C of the energy storage unit bat,i Determining the reference value P of the output power of the energy storage unit es,i ；
The energy storage unit consistency state variable determination module is used for determining the state of charge (SoC) of the ith group of energy storage units according to i Rated capacity C bat,i And the output power P bati Calculating a state variable x of consistency of the energy storage unit SoC i ；
The energy storage unit reference power correction value determining module is used for determining x i After the inter-adjacent error terms are subjected to weighted summation, a corrected value P of the reference power of the energy storage unit is obtained through a PI (proportional integral) controller SoC,i ；
The DFIG network side output active power reference value determining module is used for determining the active power P of a DFIG stator of the doubly-fed asynchronous wind generator s,i And rotor active power P r,i Difference value of (1), reference power correction value P of energy storage unit SoC,i Reference value P of output power of energy storage unit es,i Adding to obtain the DFIG network side output active power reference value P of the wind driven generator netref,i ；
The DFIG converter control module is used for decoupling control of the grid-side converter through dq so that the wind driven generator DFIG grid side outputs active power P net,i Following the active power reference value P netref,i 。
The division of each module in the control system for primary frequency modulation of the wind storage system is only used for illustration, and in other embodiments, the control system for primary frequency modulation of the wind storage system may be divided into different modules as required to complete all or part of the functions of the system.
Example (b):
the values of the various parameters of the system are shown in table 1:
TABLE 1
| Parameter(s) | Numerical value | Parameter(s) | Numerical value |
| Rated power P of fan B /MW | 1.5MW | Rotor inertia control coefficient K IR | 0.1 |
| Rated line voltage V of fan B /kV | 0.69kV | Communication weight a ij | 10 |
| Rated frequency f of system ref /Hz | 50Hz | SoC coefficient K PSoC,i ,K ISoC,i | 0.01,0.2 |
| Stator resistance R s /pu. | 2.40mΩ | DC side voltage V of fan dc /kV | 1.2kV |
| Rotor resistance R r /pu. | 1.69mΩ | Fan DC side capacitor C dc /F | 0.03F |
| StatorInductor L s /pu. | 2.343mH | Inductance L/mH | 10mH |
| Rotor inductance L r /pu. | 2.343mH | Capacity C of accumulator bat,1 /kWh | 4kWh |
| Excitation inductance L m /pu. | 2.199mH | Capacity C of accumulator bat,2 /kWh | 4kWh |
| Stator-rotor turns ratio r | 0.335 | Capacity C of accumulator bat,3 /kWh | 2kWh |
| Moment of inertia J/s | 4.63s | Capacity C of accumulator bat,4 /kWh | 2kWh |
| Energy storage differential weight coefficient K df | 0.5 | Voltage V of accumulator bat /kV | 0.8kV |
| Energy storage |
10 | Internal resistance r of accumulator bat /mΩ | 12mΩ |
As shown in fig. 7, under the condition of constant wind speed, the wind speeds of the set areas 1-4 are respectively 10m/s, 8m/s, 7m/s and 6m/s, when t is set to be 20s, the system load is suddenly increased by 1MW to reduce the frequency of the power grid, and under the condition of energy storage compensation, the frequency drop value is 0.06Hz when the load is suddenly changed, and the steady state is 49.96Hz after about 2 s; and the frequency drop value of the wind power plant without energy storage compensation reaches 0.4Hz, and can be stabilized at 49.85Hz after nearly 10 s. It can be seen that the effect of the proposed wind storage system participating in primary frequency modulation of the power grid is better than that of the wind turbine participating in frequency modulation alone: the frequency dip is smaller, the time to reach the steady state is faster, and the steady state error is smaller.
As shown in fig. 8(a) and 8(b), initial values of the storage batteries SoC in the four groups of wind farms are respectively set as: SoC (system on chip) 1 ＝0.9,SoC 2 ＝0.8,SoC 3 ＝0.7,SoC 4 0.6. Observe the SoC response of each battery pack in FIG. 8(a) and the consistency variable x in FIG. 8(b) i A situation of change. It can be seen that since the capacity of batteries 1 and 2 is twice that of batteries 3 and 4, the battery output power should first be apportioned according to the capacity of the batteries. In addition, since the initial SoC of the battery 1 is the largest, in the process that the SoC of the battery 1 tends to be consistent, the SoC of the battery 1 drops most quickly, the output power of the battery is also larger than that of the battery 2, and similarly, the power of the battery 3 is larger than that of the battery 4. Therefore, although the initial values of SoC of the batteries are not equal, the SoC difference between the batteries is gradually reduced due to the consistency control strategy, and finally the SoC difference is close to the boundary value of 0.4, so that the effect of discharging all the storage batteries together is realized.
Since any battery failure implies the loss of all communication links connected to the failed device, the other communication links still form a connection map using the communication topology in fig. 5. Setting other conditions is consistent with the above-described situation, and only when t is 40s, the battery 4 is out of order and its communication with other devices is disconnected, and the communication links 1-4 and 3-4 are out of order, and the control effect of the proposed control strategy is observed.
As shown in fig. 9(a) to 9(c), when other conditions are consistent with the above situation, if the battery 4 fails at t-40 s, the total stored energy output power will decrease due to sudden power imbalance, but due to the existence of the control strategy, the system frequency in fig. 9(a) can still be kept stable, and drops to 0.004Hz within only 1s, which is negligible. FIG. 9(b) shows the output power P of the battery pack after a failure battery4 And correspondingly 0, when the proposed controller redistributes power among the remaining batteries according to the SoC size. Fig. 9(c) shows that the battery SoC of the battery pack remains unchanged after the failure, and at this time, the reduction rate of the other three battery socs becomes large, and the time for achieving the consistency is also advanced.
As shown in FIG. 10, consider the case of four groups of wind farm wind speeds varying randomly. Similarly, it can be seen that, under the condition of energy storage compensation, the effect of the wind storage system participating in primary frequency modulation of the power grid is better than that of the wind turbine participating in primary frequency modulation alone, frequency fluctuation is obviously reduced, and the energy storage system can compensate power in real time when wind speed fluctuates, so that an expected effect is achieved.
In general terms:
(1) the invention ensures that the energy storage unit can adjust the output of the energy storage unit in real time according to different capacities based on power consistency control; meanwhile, the energy storage output power is corrected based on an energy storage unit SoC consistency protocol, and then the reference power of the DFIG network side converter is corrected, so that the output of all energy storage unit groups is further adjusted according to the SoC size on the premise of simultaneously charging and discharging. Therefore, the method can effectively realize the primary frequency modulation of the wind storage system to the power grid in real time and ensure the stable operation of the wind power plant.
(2) The invention considers the difference between the capacity of the energy storage units and the SoC, dynamically adjusts the active power output of the wind power plant according to the change of the SoC, and ensures that the SoC gradually tends to be consistent, thereby avoiding the circulating current among a plurality of energy storage units and effectively preventing the energy storage units from being overcharged or deeply discharged. Meanwhile, each energy storage unit reasonably shares load under the initial state that the capacity and the SoC are different, so that the capacity of the energy storage unit can be fully utilized.
Furthermore, those skilled in the art will appreciate that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (7)
1. A control method for primary frequency modulation of a wind storage system is characterized by comprising the following steps:
(1) according to the system frequency deviation delta f, the output active power demand P required by the energy storage system is obtained through a primary frequency modulation link d ；
(2) Based on the active power demand P d Calculating the output power reference consistency state variable z of the ith group of energy storage units i And according to the rated capacity C of the energy storage unit bat,i Determining the reference value P of the output power of the energy storage unit es,i (ii) a Wherein the output power is referenced to a coherency state variable z i Derived by the leader-follower consistency protocol:
leader equation:
follower equation:
the wind turbine generator set total set is represented by N, the No. 1 wind turbine is selected as a leader, and the leader is used
Description followingA collection of persons, a ij Reflecting the communication weight of the communication link;
reference value P of output power of energy storage unit es,i And a state variable z i The following relationship is satisfied:
wherein, K i The power is divided into coefficients
n is the total number of energy storage cells, C bat,i Is the rated capacity of the ith group of energy storage units;
(3) according to the state of charge SoC of the ith group of energy storage units i Rated capacity C bat,i And the output power P bati Calculating a state variable x of consistency of the energy storage unit SoC i ；
(4) X is to be i After the inter-adjacent error terms are subjected to weighted summation, a corrected value P of the reference power of the energy storage unit is obtained through a PI (proportional integral) controller SoC,i ；
(5) DFIG stator active power P of doubly-fed asynchronous wind generator s,i And rotor active power P r,i Difference value of (1), reference power correction value P of energy storage unit SoC,i Reference value P of output power of energy storage unit es,i Adding to obtain the DFIG network side output active power reference value P of the wind driven generator netref,i ；
(6) The grid-side converter enables the DFIG grid side of the wind driven generator to output active power P through dq decoupling control net,i Following the active power reference value P netref,i 。
2. The method according to claim 1, wherein step (1) comprises in particular:
sampling the global information quantity of the power grid frequency according to the change condition of the comprehensive load, and acquiring the output active power demand P required by the energy storage system through P/f droop control and inertia control d (ii) a Wherein the content of the first and second substances,
K df is a differential weight coefficient of the frequency deviation, K pf Droop coefficient which is frequency deviation; f ═ f ref -f is the system frequency deviation, wherein f ref The reference frequency of the power grid is 50Hz, and f is the actual frequency of the power grid.
3. The method according to claim 1, wherein, in step (3),
wherein the content of the first and second substances,
and a and b are respectively the lower limit and the upper limit of the state of charge of the energy storage unit in normal operation.
4. The method according to claim 3, wherein, in step (4),
wherein, K PSoC,i And K ISoC,i Proportional gain and integral gain of the PI controller, a ij For the communication weight, N represents the total set of wind turbines.
5. The method according to any one of claims 1 to 4, wherein the wind storage system comprises a stator side converter and a grid side converter, wherein,
the stator side converter realizes decoupling control of active power and reactive power of a DFIG stator of the wind driven generator through stator flux linkage directional vector control;
and the grid-side converter realizes decoupling control of the active power output by the grid side of the wind driven generator DFIG and the reactive power of a grid-side converter loop through grid voltage directional vector control.
6. The method according to any one of claims 1 to 4, wherein the energy storage unit controls the wind driven generator DFIG DC side voltage through a voltage-current double closed loop, so as to compensate the wind driven generator DFIG excess power required by the frequency modulation by stabilizing the wind driven generator DFIG DC side voltage.
7. A control system for primary frequency modulation of a wind storage system, comprising:
the primary frequency modulation module is used for acquiring the output active power demand P required by the primary frequency modulation of the energy storage system according to the system frequency deviation d ；
An energy storage unit output power reference value determination module for determining the active power demand P based on the output power reference value d Calculating the output power reference consistency state variable z of the energy storage unit i And according to the rated capacity C of the energy storage unit bat,i Determining the reference value P of the output power of the energy storage unit es,i (ii) a Wherein the output power is referenced to a coherency state variable z i Derived by the leader-follower consistency protocol:
leader equation:
follower equation:
the wind turbine generator set total set is represented by N, the No. 1 wind turbine is selected as a leader, and the leader is used
Set of description followers, a ij Reflecting the communication weight of the communication link;
reference value P of output power of energy storage unit es,i And a state variable z i The following relationship is satisfied:
wherein, K i The power is divided into coefficients
n is the total number of energy storage cells, C bat,i Is the rated capacity of the ith group of energy storage units;
the energy storage unit consistency state variable determination module is used for determining the state of charge (SoC) of the ith group of energy storage units according to i Rated capacity C bat,i And the output power P bati Calculating a state variable x of consistency of the energy storage unit SoC i ；
The energy storage unit reference power correction value determining module is used for determining x i After the inter-adjacent error terms are subjected to weighted summation, a corrected value P of the reference power of the energy storage unit is obtained through a PI (proportional integral) controller SoC,i ；
The DFIG network side output active power reference value determining module is used for determining the active power P of a DFIG stator of the doubly-fed asynchronous wind generator s,i And rotor active power P r,i Difference value of (1), reference power correction value P of energy storage unit SoC,i Reference value P of output power of energy storage unit es,i Adding to obtain the DFIG network side output active power reference value P of the wind driven generator netref,i ；
The DFIG converter control module is used for decoupling control of the grid-side converter through dq so that the wind driven generator DFIG grid side outputs active power P net,i Following the active power reference value P netref,i 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011469275.1A CN112600225B (en) | 2020-12-14 | 2020-12-14 | Control method and system for primary frequency modulation of wind storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011469275.1A CN112600225B (en) | 2020-12-14 | 2020-12-14 | Control method and system for primary frequency modulation of wind storage system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112600225A CN112600225A (en) | 2021-04-02 |
| CN112600225B true CN112600225B (en) | 2022-08-05 |
Family
ID=75195289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011469275.1A Active CN112600225B (en) | 2020-12-14 | 2020-12-14 | Control method and system for primary frequency modulation of wind storage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112600225B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113178897B (en) * | 2021-05-18 | 2023-06-09 | 山东大学 | Operation control method and control system for wind-energy-storage combined system |
| CN113708406B (en) * | 2021-08-23 | 2022-09-02 | 国网湖南省电力有限公司 | Inertia control method and processor for distributed energy storage type wind power plant |
| CN113517706B (en) * | 2021-09-13 | 2021-12-07 | 中国电力科学研究院有限公司 | Primary frequency modulation coordination control method, system, equipment and storage medium for wind storage system |
| CN113809748B (en) * | 2021-11-19 | 2022-02-22 | 中国电力科学研究院有限公司 | Energy storage device capacity determination method for new energy support machine and new energy support machine |
| CN114285049B (en) * | 2021-12-17 | 2023-10-13 | 中国长江三峡集团有限公司 | Control method for participation of power type capacitor and PMSG fan in primary frequency modulation |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6010485B2 (en) * | 2013-03-04 | 2016-10-19 | 株式会社日立パワーソリューションズ | Wind power generation control device and wind power generation control method |
| US10177574B2 (en) * | 2016-09-28 | 2019-01-08 | Nec Corporation | Dynamic frequency control scheme for microgrids using energy storage |
| CN108493960A (en) * | 2018-04-27 | 2018-09-04 | 中国大唐集团科学技术研究院有限公司华中分公司 | A kind of rule-based energy storage participation wind-powered electricity generation frequency modulation control method |
| CN108767877B (en) * | 2018-06-01 | 2021-12-14 | 深圳供电局有限公司 | Wind storage primary frequency modulation reserve capacity determination method based on quartile proportion wind abandoning method |
| CN109728590B (en) * | 2018-12-28 | 2022-08-19 | 南京工业大学 | Self-adaptive control method for wind turbine generator to participate in primary frequency modulation |
-
2020
- 2020-12-14 CN CN202011469275.1A patent/CN112600225B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112600225A (en) | 2021-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112600225B (en) | Control method and system for primary frequency modulation of wind storage system | |
| CN105162167B (en) | A kind of wind-light storage microgrid frequency modulation method based on adaptive droop control | |
| CN110571871A (en) | energy storage power station participating power grid primary frequency modulation depth control and contribution analysis method | |
| CN109787282A (en) | A kind of scale energy storage participates in new energy station reactive coordination control method and system | |
| CN111817326B (en) | Distributed energy storage SOC control and integration method under alternating current micro-grid island mode | |
| CN105762838B (en) | A kind of wind-powered electricity generation cluster reactive voltage multi objective control method | |
| CN109066770A (en) | A kind of control method and device of wind power integration flexible HVDC transmission system | |
| CN109617105B (en) | Distributed composite energy storage cooperative control method based on droop control | |
| CN104158198A (en) | Optimization trend control apparatus and method for power distribution network | |
| CN107204634A (en) | The reactive voltage control method and system of distributing wind-powered electricity generation | |
| CN109995051A (en) | A kind of micro- energy net systematic electricity frequency modulation control method and system | |
| CN111817327A (en) | H-bridge cascaded grid-connected energy storage system SOC balance control method | |
| CN109802423B (en) | Direct-current interconnected micro-grid system and frequency and voltage control method | |
| Gao et al. | Distributed multi‐agent control for combined AC/DC grids with wind power plant clusters | |
| Chen et al. | Cooperative control strategy for distributed wind-storage combined system based on consensus protocol | |
| CN114204577A (en) | Active support type battery energy storage power station self-adaptive control method considering SOC | |
| WO2024022543A1 (en) | Consistency algorithm-based distributed frequency control method for photovoltaic power station partition | |
| CN110661270B (en) | Coordination control method for voltage stability of power system containing wind power | |
| CN117335476A (en) | SOC balance method, device and system for network-structured energy storage | |
| CN109327031A (en) | Directly driven wind-powered multi-computer system power association control method and system based on battery energy storage | |
| CN109617141B (en) | Wind power plant active output smooth control method and device | |
| CN112271724A (en) | Virtual power plant partition construction model and construction method based on voltage regulation | |
| CN112018786B (en) | Micro-grid distributed finite time optimal frequency control method under layered framework | |
| CN115395566A (en) | Photovoltaic power station control system and method | |
| CN114977405A (en) | Charge state balance control method and system for series energy storage system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |