CN110601232A - Energy storage equipment and scheduling method thereof - Google Patents
Energy storage equipment and scheduling method thereof Download PDFInfo
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- CN110601232A CN110601232A CN201910929489.3A CN201910929489A CN110601232A CN 110601232 A CN110601232 A CN 110601232A CN 201910929489 A CN201910929489 A CN 201910929489A CN 110601232 A CN110601232 A CN 110601232A
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
Abstract
The invention discloses an energy storage device and a scheduling method thereof, wherein the scheduling method comprises the following steps: the method comprises the following steps: step (1), importing load data of a power grid, and drawing a load continuous curve (LDC) according to the load data; and (2) determining the maximum discharge power and the maximum discharge capacity of the energy storage device according to a load continuous curve (LDC). The scheduling method can effectively reduce the load peak-valley difference, has simple, practical and feasible algorithm, small calculation amount and relatively short calculation time, can quickly determine the capacity and the discharge time of the energy storage device, ensures that the energy storage device has the functions of peak clipping and valley filling, simultaneously realizes the maximization of economic benefit and saves the input cost.
Description
Technical Field
The invention relates to the technical field of optimization calculation of power devices, in particular to energy storage equipment and a scheduling method for peak clipping and valley filling of the energy storage equipment.
Background
The energy storage system absorbs energy to store for standby use in the load low-ebb period by utilizing the electric power handling characteristic of the energy storage system, releases energy in the load high-peak period, completes the peak clipping and valley filling tasks, can alleviate the situation of power shortage in the high-peak period, can delay the investment upgrade of power equipment, reduces the standby capacity of the device, improves the utilization rate of power transmission and distribution equipment, and is beneficial to the economic operation of a power grid. At present, the research of peak clipping and valley filling algorithms mainly focuses on a simulated annealing algorithm, a gradient algorithm and a dynamic programming algorithm, and the algorithms have the defects of large calculation amount and long calculation time.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the energy storage device and the scheduling method for peak clipping and valley filling thereof, which can solve the problems of large calculation amount and long calculation time of a peak clipping and valley filling algorithm.
The technical scheme provided by the invention is as follows: a method of scheduling, comprising: step (1), importing load data of a power grid, and drawing a load continuous curve (LDC) according to the load data; and (2) determining the maximum discharge power and the maximum discharge capacity of the energy storage device according to a load continuous curve (LDC).
The step (2) comprises the following steps: step (21) obtaining a load peak value P according to a load continuous curve (LDC)Peak(s)(ii) a Step (22) determining the energy storage continuous dischargeable time T according to the investment economy and technical conditions of energy storage equipmentxFinding T on the Load Duration Curve (LDC)xCorresponding active power value Px(ii) a Step (23) according to formula Pmax＝PPeak(s)-PxCalculating to obtain the maximum discharge power value P of the energy storage equipmentmax(ii) a Step (24) according to formula C ═ PPeak(s)-Px)×TxAnd calculating to obtain the capacity C of the energy storage equipment.
The operating strategy of the energy storage device is as follows: setting energy storage device discharge threshold PxWhen the monitored electrical load is higher than PxWhen the energy storage device is discharged; when the monitored electrical load is lower than PxAnd when the energy storage equipment stops discharging.
And setting the charging threshold value of the energy storage equipment to ensure that the energy storage equipment is charged at the electricity consumption valley stage.
Determining the energy storage continuous dischargeable time T according to the investment economy and technical conditions of the energy storage equipmentxThe method comprises the following steps: calculating the average load power P by the formula (1)meanP (t) is the load power at time t,t is the load duration curve period;
according to the calculated PmeanFinding the corresponding time point T on the load duration curvemeanCalculating the electric energy W required to be released by the energy storage device in the peak time period through the formula (2)peak；
Calculating a power interval Δ P for N iterations through equation (3), where PPeak(s)Is the peak of the load, PGrainThe load trough is indicated.
Calculating the discharge power of the kth iteration through a formula (4), wherein the initial value of k is 0;
Pk＝Pgrain+k×ΔP k∈(0,1,2,…,N-2,N-1,N) (4)
According to the calculated PKFinding the corresponding time point T on the load duration curvePKCalculating the discharge capacity W of the kth iteration energy storage equipment through a formula (5)discharge.k；
Wdischarge.k＝Pk×TPK (5)
If W isdischarge.k<WpeakIf k is equal to k +1, then W is recalculateddischarge.kAnd with WpeakCompare, and so on until Wdischarge.k≥WpeakStopping iteration, and calculating the T obtained by the last iterationPKAs stored energy for a dischargeable time Tx。
An energy storage device, comprising: the energy storage device is connected with the energy storage device access transformer, the energy storage device access switch is respectively connected with the energy storage device access transformer and the bus, and the bus is connected with the feeder switches.
The bus is double-section, and first section generating line links to each other with energy memory, and a plurality of feeder switch link to each other, and second section generating line links to each other with a plurality of feeder switch, and first section generating line service switch connects first section generating line and inlet wire transformer respectively, and second section generating line service switch connects second section generating line and inlet wire transformer respectively, and inlet wire transformer passes through the service switch and links to each other with the inlet wire.
The bus is three-section, the first section bus is connected with the feeder switches, the second section bus is connected with the feeder switches, the middle bus is connected with the energy storage device, the first section bus incoming line switch is respectively connected with the first section bus and the incoming line transformer, the second section bus incoming line switch is respectively connected with the second section bus and the incoming line transformer, the incoming line transformer is connected with the incoming line through the incoming line switch, the middle bus is connected with the first section bus through the first incoming line switch of the middle bus, and the middle bus is connected with the second section bus through the second incoming line switch of the middle bus.
The energy storage device comprises an energy storage device management unit, a storage battery pack and a bidirectional power converter, wherein the energy storage device management unit comprises a processor module, a signal acquisition module, an energy storage device access switch control module and an energy storage device power converter control module; the signal acquisition module is used for detecting the electrical parameters of the energy storage device and sending the stored electric quantity value to the processor module, the upper computer device module sends the load data of the electric power device to the processor module, the processor module controls the energy storage device access switch and the energy storage device power converter according to the electrical parameters of the energy storage device and the load data of the electric power device, the processor module sends the control signal to the energy storage device access switch control module and the energy storage device power converter control module, the energy storage device access switch control module controls the energy storage device access switch, and the energy storage device power converter control module controls the energy storage device power converter.
The control of the energy storage device power converter comprises the following steps: step (1) of importing into the power gridLoad data, drawing a Load Duration Curve (LDC) according to the load data; step (2) determining the maximum discharge power and capacity of the energy storage device according to a Load Duration Curve (LDC); the step (2) comprises the following steps: step (21) obtaining a load peak value P according to a load continuous curve (LDC)max(ii) a Step (22) determining the energy storage continuous dischargeable time T according to the investment economy and technical conditions of energy storage equipmentxFinding T on the Load Duration Curve (LDC)xCorresponding active power value Px(ii) a Step (23) according to formula Pmax＝PPeak(s)-PxCalculating to obtain the maximum discharge power value P of the energy storage equipmentmax(ii) a Step (24) according to formula C ═ PPeak(s)-Px)×TxCalculating to obtain the capacity C of the energy storage equipment; the operating strategy of the energy storage device is as follows: setting energy storage device discharge threshold PxWhen the monitored electrical load is higher than PxWhen the energy storage device is discharged; when the monitored electrical load is lower than PxWhen the energy storage device is discharged, the energy storage device stops discharging; and setting the charging threshold value of the energy storage equipment to ensure that the energy storage equipment is charged at the electricity consumption valley stage.
The energy storage equipment and the scheduling method thereof have the advantages of effectively reducing the load peak-valley difference, being simple, practical and feasible in algorithm, small in calculated amount and relatively short in calculation time, being capable of rapidly determining the capacity and the charging and discharging time of the energy storage device, ensuring that the energy storage device has the peak clipping and valley filling functions, realizing the maximization of economic benefits and saving the investment cost.
Drawings
FIG. 1 is a Load Duration Curve (LDC) diagram
FIG. 2 is a diagram illustrating an equal-area iterative algorithm for calculating the energy storage duration dischargeable time TxSchematic diagram of
FIG. 3 is a diagram of a dual bus main wiring diagram when the energy storage device is connected to a low voltage bus of a substation
FIG. 4 is a three-bus main wiring diagram of the energy storage device connected to the low-voltage bus of the substation
FIG. 5 is a schematic diagram of an energy storage device management unit
Detailed Description
FIG. 1 is a graph of Load Duration Curve (LDC), TxFor the duration of the energy storage and dischargeable time, on a Load Duration Curve (LDC) diagram, with TxCorresponding active power value is PxPeak load value of PPeak(s)The ordinate represents the load power value and the abscissa represents time.
FIG. 2 is a diagram illustrating an equal-area iterative algorithm for calculating the energy storage duration dischargeable time TxThe schematic diagram shows that the energy storage device with proper capacity can reduce the load peak-valley difference and the energy storage can last for the dischargeable time TxThe calculation is as follows: calculating the average load power P by the formula (1)meanP (T) is the load power at the moment T, and T is the load duration curve period;
according to the calculated PmeanFinding the corresponding time point T on the load duration curvemeanCalculating the electric energy W required to be released by the energy storage device in the peak time period through the formula (2)peak。
Calculating a power interval Δ P for N iterations through equation (3), where PPeak(s)Is the peak of the load, PGrainThe load trough is indicated.
The discharge power of the kth iteration is calculated by equation (4), with the initial value of k being 0.
Pk＝PGrain+k×ΔP k∈(0,1,2,…,N-2,N-1,N) (4)
According to the calculated PKFinding the corresponding time point T on the load duration curvePKCalculating the discharge capacity W of the kth iteration energy storage device through a formula (5)discharge.k。
Wdischarge.k＝Pk×TPK (5)
If W isdischarge.k<WpeakIf k is equal to k +1, then W is recalculateddischarge.kAnd with WpeakCompare, and so on until Wdischarge.k≥WpeakStopping iteration, and calculating the T obtained by the last iterationPKAs stored energy for a dischargeable time Tx。
In a double-bus main wiring diagram when the energy storage device is connected to a low-voltage bus of a transformer substation, the transformer substation adopts a single-bus sectional structure, the bus is divided into two sections, a first section bus incoming line switch II (105) is used as an incoming line switch of a first section bus, a second section bus incoming line switch II (106) is used as an incoming line switch of a second section bus, the first section bus is respectively connected with an energy storage device access switch II (107) and feeder switches (108) to (110), wherein the other end of the energy storage device access switch II (107) is connected with an energy storage device access transformer (103), the energy storage device II (104) is connected with the energy storage device access transformer (103), and the other ends of the feeder switches (108) to (110) are connected with a load on the first section bus. The second section of bus is respectively connected with the feeder switch (111) to the feeder switch (114), and the other ends of the feeder switch (108) to the feeder switch (110) are connected with a load on the second section of bus. When the electric power of the electric power device is excessive and the energy storage device II (104) is not fully charged, closing an energy storage device access switch II (107) and charging the energy storage device II (104) with the redundant electric energy; when the power of the power device is insufficient and the power in the energy storage device II (104) is sufficient, the energy storage device access switch II (107) is closed, and the power device is supplied with power through the energy storage device, so that peak clipping and valley filling are realized, and the power consumption cost is reduced; when the power of the power device is excessive and the energy storage device (104) is fully charged or when the power of the power device is insufficient and the power in the energy storage device II (104) is not sufficient, the energy storage device access switch II (107) is disconnected to effectively protect the energy storage device (104) and prevent the energy storage device II (104) from being overcharged or overdischarged.
In the three-bus main wiring diagram shown in fig. 4 when the energy storage device is connected to a low-voltage bus of a transformer substation, the transformer substation adopts a single-bus segmented structure, the bus is divided into three segments, a first-segment bus incoming switch III (205) is used as an incoming switch of a first-segment bus, a second-segment bus incoming switch III (206) is used as an incoming switch of a second-segment bus, the first-segment bus is respectively connected with a feeder switch (208) -a feeder switch (210) and a middle-bus first incoming switch III (203), the second-segment bus is respectively connected with a feeder switch (211) -a feeder switch (213), the middle bus second incoming line switch III (204) is connected, the middle bus is respectively connected with the middle bus first incoming line switch III (203), the middle bus second incoming line switch III (204) and the energy storage device access switch III (207), and the two ends of the energy storage device access transformer III (214) are respectively connected with the energy storage device access switch III (207) and the energy storage device III (216). The other ends of the feeder switch (208) -the feeder switch (210) are connected with the load on the first section of the bus, and the other ends of the feeder switch (211) -the feeder switch (213) are connected with the load on the second section of the bus. When the electric power of the electric device is surplus and the energy storage device III (216) is not full, closing the energy storage device access switch III (207) and charging the energy storage device III (216) with surplus electric energy; when the power of the power device is insufficient and the power in the energy storage device III (216) is sufficient, the energy storage device access switch III (207) is closed, and the power device is supplied with power through the energy storage device, so that peak clipping and valley filling are realized, and the power consumption cost is reduced; when the power of the power device is excessive and the energy storage device III (216) is fully charged or when the power of the power device is insufficient and the power in the energy storage device III (216) is not sufficient, the energy storage device access switch III (207) is switched off to effectively protect the energy storage device III (216) and prevent the energy storage device (216) from being overcharged or overdischarged.
In the structural diagram of the energy storage device management unit shown in fig. 5, the processor module 300 is respectively connected to the signal acquisition module 301, the upper computer device module 302, the energy storage device access switch control module 303, and the energy storage device power converter control module 304. The acquisition module 301 is used for detecting the electrical parameters of the energy storage device and sending the stored electric quantity value to the processor module 300, the upper computer device module 302 is used for sending the load data of the electric power device to the processor module 300, and the processor module 300 controls the access switch of the energy storage device and the power converter of the energy storage device according to the electrical parameters of the energy storage device and the load data of the electric power device and processes the dataThe device module 300 sends a control signal to the energy storage device access switch control module 303 and the energy storage device power converter control module 304, the energy storage device access switch control module 303 controls the energy storage device access switch, and the energy storage device power converter control module 304 controls the energy storage device power converter. The control comprises the following steps: step (1), importing load data of a power grid, and drawing a load continuous curve (LDC) according to the load data; step (2) determining the maximum discharge power and capacity of the energy storage device according to a Load Duration Curve (LDC); the step (2) comprises the following steps: step (21) obtaining a load peak value P according to a load continuous curve (LDC)Peak(s)(ii) a Step (22) determining the energy storage continuous dischargeable time T according to the investment economy and technical conditions of energy storage equipmentxFinding T on the Load Duration Curve (LDC)xCorresponding active power value Px(ii) a Step (23) according to formula Pmax＝PPeak(s)-PxCalculating to obtain the maximum discharge power value P of the energy storage equipmentmax(ii) a Step (24) according to formula C ═ PPeak(s)-Px)×TxCalculating to obtain the capacity C of the energy storage equipment; the operating strategy of the energy storage device is as follows: setting energy storage device discharge threshold PxWhen the monitored electrical load is higher than PxWhen the energy storage device is discharged; when the monitored electrical load is lower than PxWhen the energy storage device is discharged, the energy storage device stops discharging; and setting the charging threshold value of the energy storage equipment to ensure that the energy storage equipment is charged at the electricity consumption valley stage.
The electrical parameter of the energy storage device may be the energy storage device capacity, the rated charge-discharge power or the remaining capacity. The power plant load data may be a power load curve, a load duration curve, a predicted load curve, a daily load power peak, or a daily load power valley of the power grid.
The present invention is not limited to the disclosed embodiments and the accompanying drawings, and is intended to cover various changes and modifications that fall within the spirit and scope of the invention.
Claims (10)
1. A method of scheduling, characterized by: the method comprises the following steps: step (1), importing load data of a power grid, and drawing a load continuous curve (LDC) according to the load data; and (2) determining the maximum discharge power and the maximum discharge capacity of the energy storage device according to a load continuous curve (LDC).
2. The scheduling method of claim 1, wherein: the step (2) comprises the following steps: step (21) obtaining a load peak value P according to a load continuous curve (LDC)Peak(s)(ii) a Step (22) determining the energy storage continuous dischargeable time T according to the investment economy and technical conditions of energy storage equipmentxFinding T on the Load Duration Curve (LDC)xCorresponding active power value Px(ii) a Step (23) according to formula Pmax＝PPeak(s)-PxCalculating to obtain the maximum discharge power value P of the energy storage equipmentmax(ii) a Step (24) according to formula C ═ PPeak(s)-Px)×TxAnd calculating to obtain the capacity C of the energy storage equipment.
3. The scheduling method of claim 2, wherein: the operating strategy of the energy storage device is as follows: setting energy storage device discharge threshold PxWhen the monitored electrical load is higher than PxWhen the energy storage device is discharged; when the monitored electrical load is lower than PxAnd when the energy storage equipment stops discharging.
4. The scheduling method of claim 3, wherein: and setting the charging threshold value of the energy storage equipment to ensure that the energy storage equipment is charged at the electricity consumption valley stage.
5. The scheduling method of claim 2, wherein: determining the energy storage continuous dischargeable time T according to the investment economy and technical conditions of the energy storage equipmentxThe method comprises the following steps: calculating the average load power P by the formula (1)meanP (T) is the load power at the moment T, and T is the load duration curve period;
according to the calculated PmeanFinding the corresponding time point T on the load duration curvemeanCalculating the electric energy W required to be released by the energy storage device in the peak time period through the formula (2)peak；
Calculating a power interval Δ P for N iterations through equation (3), where PPeak(s)Is the peak of the load, PGrainThe load trough is indicated.
Calculating the discharge power of the kth iteration through a formula (4), wherein the initial value of k is 0;
Pk＝Pgrain+k×ΔP k∈(0,1,2,…,N-2,N-1,N) (4)
According to the calculated PKFinding the corresponding time point T on the load duration curvePKCalculating the discharge capacity W of the kth iteration energy storage equipment through a formula (5)discharge.k；
Wdischarge.k＝Pk×TPK (5)
If W isdischarge.k<WpeakIf k is equal to k +1, then W is recalculateddischarge.kAnd with WpeakCompare, and so on until Wdischarge.k≥WpeakStopping iteration, and calculating the T obtained by the last iterationPKAs stored energy for a dischargeable time Tx。
6. An energy storage device, comprising: energy memory, energy memory access transformer, energy memory access switch, generating line and a plurality of feeder switch, its characterized in that: the energy storage device is connected with the energy storage device access transformer, the energy storage device access switch is respectively connected with the energy storage device access transformer and the bus, and the bus is connected with the plurality of feeder switches.
7. The energy storage device of claim 6, wherein: the bus is double-section, and first section generating line links to each other with energy memory, and a plurality of feeder switch link to each other, and second section generating line links to each other with a plurality of feeder switch, and first section generating line service switch connects first section generating line and inlet wire transformer respectively, and second section generating line service switch connects second section generating line and inlet wire transformer respectively, and inlet wire transformer passes through the service switch and links to each other with the inlet wire.
8. The energy storage device of claim 6, wherein: the bus is three-section, the first section bus is connected with the feeder switches, the second section bus is connected with the feeder switches, the middle bus is connected with the energy storage device, the first section bus incoming line switch is respectively connected with the first section bus and the incoming line transformer, the second section bus incoming line switch is respectively connected with the second section bus and the incoming line transformer, the incoming line transformer is connected with the incoming line through the incoming line switch, the middle bus is connected with the first section bus through the first incoming line switch of the middle bus, and the middle bus is connected with the second section bus through the second incoming line switch of the middle bus.
9. The energy storage device of claim 6, wherein: the energy storage device comprises an energy storage device management unit, a storage battery pack and a bidirectional power converter, wherein the energy storage device management unit comprises a processor module, a signal acquisition module, an energy storage device access switch control module and an energy storage device power converter control module; the signal acquisition module is used for detecting the electrical parameters of the energy storage device and sending the stored electric quantity value to the processor module, the upper computer device module sends the load data of the electric power device to the processor module, the processor module controls the energy storage device access switch and the energy storage device power converter according to the electrical parameters of the energy storage device and the load data of the electric power device, the processor module sends the control signal to the energy storage device access switch control module and the energy storage device power converter control module, the energy storage device access switch control module controls the energy storage device access switch, and the energy storage device power converter control module controls the energy storage device power converter.
10. The energy storage device of claim 6, wherein: the control of the energy storage device power converter comprises the following steps: step (1), importing load data of a power grid, and drawing a load continuous curve (LDC) according to the load data; step (2) determining the maximum discharge power and capacity of the energy storage device according to a Load Duration Curve (LDC); the step (2) comprises the following steps: step (21) obtaining a load peak value P according to a load continuous curve (LDC)max(ii) a Step (22) determining the energy storage continuous dischargeable time T according to the investment economy and technical conditions of energy storage equipmentxFinding T on the Load Duration Curve (LDC)xCorresponding active power value Px(ii) a Step (23) according to formula Pmax＝PPeak(s)-PxCalculating to obtain the maximum discharge power value P of the energy storage equipmentmax(ii) a Step (24) according to formula C ═ PPeak(s)-Px)×TxCalculating to obtain the capacity C of the energy storage equipment; the operating strategy of the energy storage device is as follows: setting energy storage device discharge threshold PxWhen the monitored electrical load is higher than PxWhen the energy storage device is discharged; when the monitored electrical load is lower than PxWhen the energy storage device is discharged, the energy storage device stops discharging; and setting the charging threshold value of the energy storage equipment to ensure that the energy storage equipment is charged at the electricity consumption valley stage.
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