Coordination control method and system for thermal power generating unit with energy storage device under deep peak regulation

Abstract

The invention discloses a coordinated control method and system for a thermal power generating unit with an energy storage device under a deep peak regulation working condition, and the method comprises the steps: determining a rotating speed unequal rate formula of the thermal power generating unit, and obtaining a primary frequency modulation demand delta P of the thermal power generating unit based on the rotating speed unequal rate formula; determining a current power coefficient k2 of the energy storage device; and determining a primary frequency modulation control strategy and a load adjustment control strategy of the thermal power generating unit based on the primary frequency modulation demand quantity delta P of the thermal power generating unit, the current power coefficient k2 of the energy storage device, the rated output power Pf0 of the energy storage device, the adjustment quantity delta Pf of the energy storage device and the adjustment quantity delta PL of the thermal power generating unit. According to the fire and energy storage combined control method and system with the energy storage device, the dynamic response capability of the thermal power generating unit under the deep peak regulation working condition can be effectively achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and more specifically, to a coordinated control method and system for a thermal power unit with an energy storage device under deep peak regulation conditions. Background Art

[0002] As the proportion of new energy (such as wind power and solar energy) in the power grid continues to increase, the minimum load of thermal power units continues to drop. At the same time, the inherent intermittent, volatile and seasonal characteristics of new energy increase the difficulty of frequency regulation and peak regulation of conventional power sources. Due to the problem of stable combustion of thermal power boilers and the common problems of insufficient peak regulation capacity and low load response rate in deep peak regulation of thermal power units, thermal power units are unable to reduce their loads in the dynamic response process. At the same time, when the development of new energy requires thermal power units to further reduce their loads, thermal power units cannot reduce their loads due to the problem of stable combustion of boilers.

[0003] Therefore, a coordinated control method for deep peak load regulation of thermal power units with energy storage devices is proposed, which can improve the primary frequency regulation performance of the unit and absorb the load of the thermal power units at the same time. Summary of the invention

[0004] The technical solution of the present invention provides a coordinated control method and system for a thermal power unit with an energy storage device under deep peak-shaving conditions, so as to solve the problem of how to coordinate control of a thermal power unit with an energy storage device under deep peak-shaving conditions.

[0005] In order to solve the above problems, the present invention provides a coordinated control method under deep peak load regulation conditions for a thermal power unit with an energy storage device, the method comprising:

[0006] Determine a speed inequality formula for the thermal power unit, and obtain a primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality formula;

[0007] Determine the current power factor k2 of the energy storage device;

[0008] Based on the primary frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit.

[0009] Preferably, the formula for determining the speed inequality rate of the thermal power unit, and obtaining the primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality rate formula, includes:

[0010] The formula for determining the speed inequality of a thermal power unit is:

[0011]

[0012] Determine the primary frequency regulation demand ΔP of the thermal power unit:

[0013]

[0014] Among them, Δf is the difference between the actual frequency and the rated frequency of the thermal power unit; f e is the rated frequency of the thermal power unit; δ is the speed inequality rate of the thermal power unit; P e is the rated power of the thermal power unit.

[0015] Preferably, determining the current power coefficient k2 of the energy storage device includes:

[0016] Determine the current power coefficient k2 of the energy storage device as:

[0017]

[0018] Where k2 is the current power coefficient of the energy storage device; P f P is the maximum output power of the energy storage device at present; f0 is the rated output power of the energy storage device.

[0019] Preferably, the primary frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device are f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including:

[0020] When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is higher than the rated frequency and the unit needs to reduce load, that is, the energy storage device needs to absorb power:

[0021] When ΔP≤(1-k2)×P f0 When the primary frequency regulation load required by the thermal power unit is less than or equal to the idle load capacity of the energy storage device,

[0022] ΔP=-(1-k2)×P f0

[0023] When ΔP>(1-k2)×P f0 When the load required for primary frequency regulation of the thermal power unit is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs of primary frequency regulation, that is, the unit and the energy storage device need to jointly adjust the primary frequency regulation load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is provided by the primary frequency regulation function of the thermal power unit:

[0024] ΔP=-(1-k2)×P f0 -ΔP lf

[0025] Where ΔP lf It is the primary frequency adjustment amount of the thermal power unit;

[0026] When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is lower than the rated frequency and the unit needs to increase the load, that is, the energy storage device needs to release power:

[0027] When ΔP≤k2×P f0 When the primary frequency regulation load of the thermal power unit is less than the current maximum output power of the energy storage device:

[0028] ΔP=ΔP f

[0029] When ΔP>k2×P f0 When the load required for primary frequency regulation of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase requirement of primary frequency regulation. The thermal power unit and the energy storage device need to jointly adjust the load for primary frequency regulation. The energy storage device first increases the load and fully releases the power, and the remaining part is provided by the primary frequency regulation function of the thermal power unit:

[0030] ΔP=ΔP f +ΔP lf .

[0032] Preferably, the primary frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device are f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including:

[0033] When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is greater than the load and the unit needs to reduce the load, that is, the energy storage device needs to absorb power:

[0034] When ΔP≤-(1-k2)×P f0 When ΔP=-(1-k2)×P f0 That is, the load reduction adjustment required by the thermal power unit is less than or equal to the idle load capacity of the energy storage device:

[0035] When ΔP>(1-k2)×P f0When the load required by the thermal power unit for load reduction adjustment is greater than the available load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is adjusted by the thermal power unit:

[0036] ΔP=-(1-k2)×P f0 -ΔP L

[0037] When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is less than the load and the unit needs to increase the load, that is, the energy storage device needs to release power:

[0038] When ΔP≤k2×P f0 When the load adjustment demand of the thermal power unit is less than or equal to the current maximum output power of the energy storage device:

[0039] ΔP=k2×P f0

[0040] When ΔP>k2×P f0 When the load adjustment demand of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase demand, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first increases the load to fully release the power, and the remaining part is adjusted by the thermal power unit:

[0041] ΔP=k2×P f0 +ΔP L .

[0043] Based on another aspect of the present invention, the present invention provides a coordinated control system under deep peak load regulation conditions of a thermal power unit with an energy storage device, the system comprising:

[0044] A first determination unit is used to determine a speed inequality formula of the thermal power unit, and obtain a primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality formula;

[0045] A second determining unit, used to determine a current power coefficient k2 of the energy storage device;

[0046] The result unit is used to calculate the frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device. f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit.

[0047] Preferably, the first determining unit is used to determine a speed inequality formula of the thermal power unit, and obtain a primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality formula, including:

[0048] The formula for determining the speed inequality of a thermal power unit is:

[0049]

[0050] Determine the primary frequency regulation demand ΔP of the thermal power unit:

[0051]

[0052] Among them, Δf is the difference between the actual frequency and the rated frequency of the thermal power unit; f e is the rated frequency of the thermal power unit; δ is the speed inequality rate of the thermal power unit; P e is the rated power of the thermal power unit.

[0053] Preferably, the second determining unit is used to determine the current power coefficient k2 of the energy storage device, including:

[0054] Determine the current power coefficient k2 of the energy storage device as:

[0055]

[0056] Where k2 is the current power coefficient of the energy storage device; P f P is the maximum output power of the energy storage device at present; f0 is the rated output power of the energy storage device.

[0057] Preferably, the result unit is used to calculate the primary frequency regulation demand based on the thermal power unit. ΔP , the current power factor k2 of the energy storage device, the rated output power P of the energy storage device f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including:

[0058] When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is higher than the rated frequency and the unit needs to reduce load, that is, the energy storage device needs to absorb power:

[0059] When ΔP≤(1-k2)×P f0 When the primary frequency regulation load required by the thermal power unit is less than or equal to the idle load capacity of the energy storage device,

[0060] ΔP=-(1-k2)×P f0

[0061] When ΔP>(1-k2)×Pf0 When the load required for primary frequency regulation of the thermal power unit is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs of primary frequency regulation, that is, the unit and the energy storage device need to jointly adjust the primary frequency regulation load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is provided by the primary frequency regulation function of the thermal power unit:

[0062] ΔP=-(1-k2)×P f0 -ΔP lf

[0063] Where ΔP lf It is the primary frequency adjustment amount of the thermal power unit;

[0064] When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is lower than the rated frequency and the unit needs to increase the load, that is, the energy storage device needs to release power:

[0065] When ΔP≤k2×P f0 When the primary frequency regulation load of the thermal power unit is less than the current maximum output power of the energy storage device:

[0066] ΔP=ΔP f

[0067] When ΔP>k2×P f0 When the load required for primary frequency regulation of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase requirement of primary frequency regulation. The thermal power unit and the energy storage device need to jointly adjust the load for primary frequency regulation. The energy storage device first increases the load and fully releases the power, and the remaining part is provided by the primary frequency regulation function of the thermal power unit:

[0068] ΔP=ΔP f +ΔP lf .

[0070] Preferably, the result unit is used to calculate the frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device. f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including:

[0071] When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is greater than the load and the unit needs to reduce the load, that is, the energy storage device needs to absorb power:

[0072] When ΔP≤-(1-k2)×P f0 When ΔP=-(1-k2)×Pf0 That is, the load reduction adjustment required by the thermal power unit is less than or equal to the idle load capacity of the energy storage device:

[0073] When ΔP>(1-k2)×P f0 When the load required by the thermal power unit for load reduction adjustment is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is adjusted by the unit:

[0074] ΔP=-(1-k2)×P f0 -ΔP L

[0075] When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is less than the load and the unit needs to increase the load, that is, the energy storage device needs to release power:

[0076] When ΔP≤k2×P f0 When the load adjustment demand of the thermal power unit is less than or equal to the current maximum output power of the energy storage device:

[0077] ΔP=k2×P f0

[0078] When ΔP>k2×P f0 When the load adjustment demand of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase demand, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first increases the load to fully release the power, and the remaining part is adjusted by the thermal power unit:

[0079] ΔP=k2×P f0 +ΔP L .

[0081] The technical solution of the present invention provides a method and system for coordinated control of a thermal power unit with an energy storage device under deep peak load conditions, wherein the method comprises: determining a speed inequality formula of the thermal power unit, and obtaining a primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality formula; determining a current power coefficient k2 of the energy storage device; and obtaining a primary frequency regulation demand ΔP of the thermal power unit based on the primary frequency regulation demand ΔP of the thermal power unit and the current power coefficient k2 of the energy storage device. 2、 Rated output power P of energy storage device f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit LThe primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit are determined. The technical solution of the present invention provides a method and system for combined control of thermal power generation with energy storage devices, which can effectively solve the dynamic response capability of the thermal power unit under deep peak regulation conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0083] Figure 1 A flow chart of a coordinated control method under deep peak load conditions for a thermal power unit with an energy storage device according to a preferred embodiment of the present invention; and

[0084] Figure 2 The structure diagram of a coordinated control system under deep peak load regulation conditions for a thermal power unit with an energy storage device according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0085] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0086] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0087] Figure 1 The present invention is a flow chart of a coordinated control method under deep peak load conditions for a thermal power unit with an energy storage device according to a preferred embodiment of the present invention.

[0088] The present invention relates to a coordinated control method for a thermal power unit with an energy storage device to participate in frequency regulation under deep peak regulation conditions and to absorb excess online load of the unit when further load reduction is required, so that the primary frequency regulation capability of the thermal power unit is improved while having the ability to further reduce online load.

[0089] In order to solve the problem of dynamic response capability of thermal power units under the condition of large-scale development of new energy, the purpose of the present invention is to provide a method for combined control of thermal energy storage with energy storage device, which can effectively solve the problem of dynamic response capability of thermal power units under deep peak regulation conditions.

[0090] Based on the characteristics of high proportion and volatility of new energy, the present invention utilizes the bidirectional flow capability of the energy storage device and realizes the dynamic response capability of the thermal power unit under deep peak regulation conditions and the ability to further reduce the minimum output through joint coordinated control of thermal energy storage.

[0091] The present invention can effectively improve the dynamic response capability of a thermal power generating set.

[0092] like Figure 1 As shown, the present invention provides a coordinated control method under deep peak load regulation conditions for a thermal power unit with an energy storage device, the method comprising:

[0093] Step 101: determining a speed inequality formula of the thermal power unit, and obtaining a primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality formula;

[0094] Preferably, determining a speed inequality formula of the thermal power unit, and obtaining a primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality formula, comprises:

[0095] The formula for determining the speed inequality of a thermal power unit is:

[0096]

[0097] Determine the primary frequency regulation demand ΔP of the thermal power unit:

[0098]

[0099] Among them, Δf is the difference between the actual frequency and the rated frequency of the thermal power unit; f e is the rated frequency of the thermal power unit; δ is the speed inequality rate of the thermal power unit; P e is the rated power of the thermal power unit.

[0100] Step 102: Determine the current power coefficient k2 of the energy storage device;

[0101] Preferably, determining the current power coefficient k2 of the energy storage device includes:

[0102] Determine the current power coefficient k2 of the energy storage device as:

[0103]

[0104] Where k2 is the current power coefficient of the energy storage device; P f P is the maximum output power of the energy storage device at present; f0 is the rated output power of the energy storage device.

[0105] Step 103: Based on the primary frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device f0, Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit.

[0106] Preferably, based on the primary frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including:

[0107] When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is higher than the rated frequency and the unit needs to reduce load, that is, the energy storage device needs to absorb power:

[0108] When ΔP≤(1-k2)×P f0 When the primary frequency regulation load required by the thermal power unit is less than or equal to the idle load capacity of the energy storage device:

[0109] ΔP=-(1-k2)×P f0

[0110] When ΔP>(1-k2)×P f0 When the load required for primary frequency regulation of the thermal power unit is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs of primary frequency regulation, that is, the unit and the energy storage device need to jointly adjust the primary frequency regulation load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is provided by the primary frequency regulation function of the thermal power unit:

[0111] ΔP=-(1-k2)×P f0 -ΔP lf

[0112] Among them, ΔP lf It is the primary frequency adjustment amount of the thermal power unit;

[0113] When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is lower than the rated frequency and the unit needs to increase the load, that is, the energy storage device needs to release power:

[0114] When ΔP≤k2×P f0 When the primary frequency regulation load of the thermal power unit is less than the current maximum output power of the energy storage device:

[0115] ΔP=ΔP f

[0116] When ΔP>k2×P f0When the load required for primary frequency regulation of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase requirement of primary frequency regulation. The thermal power unit and the energy storage device need to jointly adjust the load for primary frequency regulation. The energy storage device first increases the load and fully releases the power, and the remaining part is provided by the primary frequency regulation function of the thermal power unit:

[0117] ΔP=ΔP f +ΔP lf .

[0119] Preferably, based on the primary frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including:

[0120] When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is greater than the load and the unit needs to reduce the load, that is, the energy storage device needs to absorb power:

[0121] When ΔP≤-(1-k2)×P f0 When the thermal power unit reduces load, the required load is less than or equal to the idle load capacity of the energy storage device:

[0122] When ΔP>(1-k2)×P f0 When the load required by the thermal power unit for load reduction adjustment is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is adjusted by the unit:

[0123] ΔP=-(1-k2)×P f0 -ΔP L

[0124] When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is less than the load and the unit needs to increase the load, that is, the energy storage device needs to release power:

[0125] When ΔP≤k2×P f0 When the load adjustment demand of the thermal power unit is less than or equal to the current maximum output power of the energy storage device:

[0126] ΔP=k2×P f0

[0127] When ΔP>k2×P f0When the load adjustment demand of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase demand, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first increases the load and fully releases the power, and the remaining part is adjusted by the thermal power unit:

[0128] ΔP=k2×P f0 +ΔP L .

[0130] The coordinated control method of the deep peak-shaving working condition of the thermal power unit with the energy storage device of the present invention is to introduce the flexible bidirectional load flow capacity of the energy storage device into the coordinated control link of the deep peak-shaving working condition of the thermal power unit, so that the thermal power unit has the ability to reduce and quickly increase the load. The present invention greatly improves the dynamic response capability of the primary frequency regulation of the unit, and at the same time can greatly improve the load adjustment capability of the unit and the adjustment width of the minimum amount of the online load.

[0131] First, the calculation formula of the generator speed inequality is as follows:

[0132]

[0133] The frequency modulation demand can be obtained

[0134]

[0135] In the formula, ΔP is the adjusted power value; Δf is the difference between the actual frequency and the rated frequency of the unit; f e is the rated frequency of the generator set; δ is the speed inequality of the unit; P e is the rated power of the unit.

[0136] Secondly, the calculation formula for the imbalance between the energy storage device power and the generator set power is as follows:

[0137] ΔP g =ΔP L +ΔP f

[0138] Where ΔP g The unbalanced power amount that needs to be adjusted for the unit; ΔP L is the adjustment amount of the unit; ΔP f Adjustment amount for the energy storage device.

[0139] Third, the power judgment of energy storage device

[0140]

[0141] In the formula, k1 is the coefficient between the rated power of the energy storage device and the rated power of the unit; Pe is the rated power of the generator set; P f0 is the rated output power of the energy storage device.

[0142]

[0143] Where k2 is the current power coefficient of the energy storage device; P f P is the maximum output power of the energy storage device at present; f0 is the rated output power of the energy storage device.

[0144] Fourth, primary frequency coordination control strategy

[0145] Ⅰ. When the generator set is in deep peak load regulation condition and the frequency of the generator set is higher than the rated frequency and the generator set needs to reduce load, the energy storage device needs to absorb power.

[0146] When ΔP≤(1-k2)×P f0 When the primary frequency regulation demand load is less than or equal to the idle load capacity of the energy storage device.

[0147] ΔP=-(1-k2)×P f0

[0148] When ΔP>(1-k2)×P f0 When the load required for primary frequency regulation is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs of primary frequency regulation. In this case, the unit and the energy storage device need to jointly adjust the load for primary frequency regulation. The energy storage device first absorbs the load until it is full, and the remaining part is provided by the primary frequency regulation function of the unit.

[0149] ΔP=-(1-k2)×P f0 -ΔP lf

[0150] Ⅱ. When the generator set is in deep peak load regulation condition and the frequency of the generator set is lower than the rated frequency and the load of the generator set needs to be increased, the energy storage device needs to release power.

[0151] When ΔP≤k2×P f0 When the primary frequency regulation load is less than or equal to the current maximum output power of the energy storage device.

[0152] ΔP=ΔP f

[0153] When ΔP>k2×P f0 When the load required for primary frequency regulation is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase requirement of primary frequency regulation. In this case, the unit and the energy storage device need to jointly adjust the load for primary frequency regulation. The energy storage device first increases the load and releases the power completely, and the remaining part is provided by the primary frequency regulation function of the unit.

[0154] ΔP=ΔP f +ΔP lf

[0155] Fifth, unit load adjustment control strategy

[0156] Ⅰ. When the generator set is in deep peak load regulation, the output of the generator set is greater than the load and the generator set needs to reduce the load, that is, the energy storage device needs to absorb power.

[0157] When ΔP≤-(1-k2)×P f0 When the load is reduced, the required load is adjusted to be less than or equal to the idle load capacity of the energy storage device.

[0158] ΔP=-(1-k2)×P f0

[0159] When ΔP>(1-k2)×P f0 When the load reduction adjustment demand is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs. In this case, the unit and the energy storage device need to adjust the load together. The energy storage device first absorbs the load until the energy storage device is full, and the remaining part is adjusted by the unit.

[0160] ΔP=-(1-k2)×P f0 -ΔP L

[0161] Ⅱ. When the generator set is in deep peak load regulation, the output of the generator set is less than the load and the generator set needs to increase the load, that is, the energy storage device needs to release power.

[0162] When ΔP≤k2×P f0 When the load is increased, the required load is adjusted to be less than or equal to the current maximum output power of the energy storage device.

[0163] ΔP=k2×P f0

[0164] When ΔP>k2×P f0 When the load adjustment demand is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase needs. In this case, the unit and the energy storage device need to adjust the load together. The energy storage device first increases the load and fully releases the power, and the remaining part is adjusted by the unit.

[0165] ΔP=k2×P f0 +ΔP L

[0166] like Figure 2 As shown, the present invention provides a coordinated control system under deep peak load regulation conditions for a thermal power unit with an energy storage device, the system comprising:

[0167] The first determination unit 201 is used to determine a speed inequality formula of the thermal power unit, and obtain a primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality formula;

[0168] A second determining unit 202, configured to determine a current power coefficient k2 of the energy storage device;

[0169] The result unit 203 is used to calculate the power consumption of the thermal power unit based on the primary frequency regulation demand ΔP, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device. f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit.

[0170] Preferably, the first determination unit 201 is used to determine a speed inequality formula of the thermal power unit, and obtain a primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality formula, including:

[0171] The formula for determining the speed inequality of a thermal power unit is:

[0172]

[0173] Determine the primary frequency regulation demand ΔP of the thermal power unit:

[0174]

[0175] Among them, Δf is the difference between the actual frequency and the rated frequency of the thermal power unit; f e is the rated frequency of the thermal power unit; δ is the speed inequality rate of the thermal power unit; P e is the rated power of the thermal power unit.

[0176] Preferably, the second determining unit 202, used to determine the current power coefficient k2 of the energy storage device, includes:

[0177] Determine the current power coefficient k2 of the energy storage device as:

[0178]

[0179] Where k2 is the current power coefficient of the energy storage device; P f P is the maximum output power of the energy storage device at present; f0 is the rated output power of the energy storage device.

[0180] Preferably, the result unit 203 is used to calculate the frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device. f0 , Energy storage device adjustment ΔPf And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including:

[0181] When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is higher than the rated frequency and the unit needs to reduce load, that is, the energy storage device needs to absorb power:

[0182] When ΔP≤(1-k2)×P f0 When the primary frequency regulation load required by the thermal power unit is less than or equal to the idle load capacity of the energy storage device,

[0183] ΔP=-(1-k2)×P f0

[0184] When ΔP>(1-k2)×P f0 When the load required for primary frequency regulation of the thermal power unit is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs of primary frequency regulation, that is, the unit and the energy storage device need to jointly adjust the primary frequency regulation load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is provided by the primary frequency regulation function of the thermal power unit:

[0185] ΔP=-(1-k2)×P f0 -ΔP lf

[0186] Where ΔP lf It is the primary frequency adjustment amount of the thermal power unit;

[0187] When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is lower than the rated frequency and the unit needs to increase the load, that is, the energy storage device needs to release power:

[0188] When ΔP≤k2×P f0 When the primary frequency regulation load of the thermal power unit is less than the current maximum output power of the energy storage device:

[0189] ΔP=ΔP f

[0190] When ΔP>k2×P f0 When the load required for primary frequency regulation of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase requirement of primary frequency regulation. The thermal power unit and the energy storage device need to jointly adjust the load for primary frequency regulation. The energy storage device first increases the load and fully releases the power, and the remaining part is provided by the primary frequency regulation function of the thermal power unit:

[0191] ΔP=ΔP f +ΔP lf .

[0193] Preferably, the result unit 203 is used to calculate the frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device. f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including:

[0194] When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is greater than the load and the unit needs to reduce the load, that is, the energy storage device needs to absorb power:

[0195] When ΔP≤-(1-k2)×P f0 When ΔP=-(1-k2)×P f0 That is, the load reduction adjustment required by the thermal power unit is less than or equal to the idle load capacity of the energy storage device:

[0196] When ΔP>(1-k2)×P f0 When the load required by the thermal power unit for load reduction adjustment is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is adjusted by the unit:

[0197] ΔP=-(1-k2)×P f0 -ΔP L

[0198] When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is less than the load and the unit needs to increase the load, that is, the energy storage device needs to release power:

[0199] When ΔP≤k2×P f0 When the load adjustment demand of the thermal power unit is less than or equal to the current maximum output power of the energy storage device:

[0200] ΔP=k2×P f0

[0201] When ΔP>k2>P f0 When the load adjustment demand of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase demand, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first increases the load to fully release the power, and the remaining part is adjusted by the thermal power unit:

[0202] ΔP=k2×P f0 +ΔP L .

[0204] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0205] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0206] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0207] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0208] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0209] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0210] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0211] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of the means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

Claims

1. A coordinated control method for a thermal power unit with an energy storage device under deep peak load conditions, the method comprising: Determine a speed inequality formula for the thermal power unit, and obtain a primary frequency regulation demand ΔP for the thermal power unit based on the speed inequality formula; Determine the current power factor k2 of the energy storage device; Based on the primary frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit.

2. The method according to claim 1, wherein determining the speed inequality formula of the thermal power unit and obtaining the primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality formula comprises: The formula for determining the speed inequality of a thermal power unit is: Determine the primary frequency regulation demand ΔP of the thermal power unit: Among them, Δf is the difference between the actual frequency and the rated frequency of the thermal power unit; f e is the rated frequency of the thermal power unit; δ is the speed inequality rate of the thermal power unit; P e is the rated power of the thermal power unit.

3. The method according to claim 2, wherein determining the current power coefficient k2 of the energy storage device comprises: Determine the current power coefficient k2 of the energy storage device as: Where k2 is the current power coefficient of the energy storage device; P f P is the maximum output power of the energy storage device at present; f0 is the rated output power of the energy storage device.

4. The method according to claim 3, wherein the frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, the rated output power P of the energy storage device f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including: When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is higher than the rated frequency and the unit needs to reduce load, that is, the energy storage device needs to absorb power: When ΔP≤(1-k2)×P f0 When the primary frequency regulation load required by the thermal power unit is less than or equal to the idle load capacity of the energy storage device, ΔP=-(1-k2)×P f0 When ΔP>(1-k2)×P f0 When the load required for primary frequency regulation of the thermal power unit is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs of primary frequency regulation, that is, the unit and the energy storage device need to jointly adjust the primary frequency regulation load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is provided by the primary frequency regulation function of the thermal power unit: ΔP=-(1-k2)×P f0 -ΔP lf Among them, ΔP lf It is the primary frequency adjustment amount of the thermal power unit; When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is lower than the rated frequency and the unit needs to increase the load, that is, the energy storage device needs to release power: When ΔP≤k2×P f0 When the primary frequency regulation load of the thermal power unit is less than the current maximum output power of the energy storage device: ΔP=ΔP f When ΔP>k2×P f0 When the load required for primary frequency regulation of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase requirement of primary frequency regulation. The thermal power unit and the energy storage device need to jointly adjust the load for primary frequency regulation. The energy storage device first increases the load and fully releases the power, and the remaining part is provided by the primary frequency regulation function of the thermal power unit: ΔP=ΔP f +ΔP lf 。 5. The method according to claim 3, wherein the frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, the rated output power P of the energy storage device f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including: When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is greater than the load and the unit needs to reduce the load, that is, the energy storage device needs to absorb power: When ΔP≤-(1-k2)×P f0 When ΔP=-(1-k2)×P f0 That is, the load reduction adjustment required by the thermal power unit is less than or equal to the idle load capacity of the energy storage device: When ΔP>(1-k2)×P f0 When the load required by the thermal power unit for load reduction adjustment is greater than the available load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is adjusted by the thermal power unit: ΔP=-(1-k2)×P f0 -ΔP L When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is less than the load and the unit needs to increase the load, that is, the energy storage device needs to release power: When ΔP≤k2×P f0 When the load adjustment demand of the thermal power unit is less than or equal to the current maximum output power of the energy storage device: ΔP=k2×P f0 When ΔP>k2×P f0 When the load adjustment demand of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase demand, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first increases the load to fully release the power, and the remaining part is adjusted by the thermal power unit: ΔP=k2×P f0 +ΔP L 。 6. A coordinated control system for a thermal power unit with an energy storage device under deep peak load conditions, the system comprising: A first determination unit is used to determine a speed inequality formula of the thermal power unit, and obtain a primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality formula; A second determining unit, used to determine a current power coefficient k2 of the energy storage device; The result unit is used to calculate the frequency regulation demand ΔP of the thermal power unit, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device. f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit.

7. The system according to claim 6, wherein the first determining unit is used to determine a speed inequality formula of the thermal power unit, and obtain a primary frequency regulation demand ΔP of the thermal power unit based on the speed inequality formula, comprising: The formula for determining the speed inequality of a thermal power unit is: Determine the primary frequency regulation demand ΔP of the thermal power unit: Among them, Δf is the difference between the actual frequency and the rated frequency of the thermal power unit; f e is the rated frequency of the thermal power unit; δ is the speed inequality rate of the thermal power unit; P e is the rated power of the thermal power unit.

8. The system according to claim 7, wherein the second determining unit is used to determine the current power coefficient k2 of the energy storage device, comprising: Determine the current power coefficient k2 of the energy storage device as: Where k2 is the current power coefficient of the energy storage device; P f P is the maximum output power of the energy storage device at present; f0 is the rated output power of the energy storage device.

9. The system according to claim 8, wherein the result unit is used to calculate the power consumption of the thermal power unit based on the primary frequency regulation demand ΔP, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device. f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including: When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is higher than the rated frequency and the unit needs to reduce load, that is, the energy storage device needs to absorb power: When ΔP≤(1-k2)×P f0 When the primary frequency regulation load required by the thermal power unit is less than or equal to the idle load capacity of the energy storage device, ΔP=-(1-k2)×P f0 When ΔP>(1-k2)×P f0 When the load required for primary frequency regulation of the thermal power unit is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs of primary frequency regulation, that is, the unit and the energy storage device need to jointly adjust the primary frequency regulation load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is provided by the primary frequency regulation function of the thermal power unit: ΔP=-(1-k2)×P f0 -ΔP lf Among them, ΔP lf It is the primary frequency adjustment amount of the thermal power unit; When the thermal power unit is in deep peak load regulation, the frequency of the thermal power unit is lower than the rated frequency and the unit needs to increase the load, that is, the energy storage device needs to release power: When ΔP≤k2×P f0 When the primary frequency regulation load of the thermal power unit is less than the current maximum output power of the energy storage device: ΔP=ΔP f When ΔP>k2×P f0 When the load required for primary frequency regulation of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase requirement of primary frequency regulation. The thermal power unit and the energy storage device need to jointly adjust the load for primary frequency regulation. The energy storage device first increases the load and fully releases the power, and the remaining part is provided by the primary frequency regulation function of the thermal power unit: ΔP=ΔP f +ΔP lf 。 10. The system according to claim 8, wherein the result unit is used to calculate the power consumption of the thermal power unit based on the primary frequency regulation demand ΔP, the current power coefficient k2 of the energy storage device, and the rated output power P of the energy storage device. f0 , Energy storage device adjustment ΔP f And the adjustment amount ΔP of the thermal power unit L Determine the primary frequency regulation control strategy and load adjustment control strategy of the thermal power unit, including: When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is greater than the load and the unit needs to reduce the load, that is, the energy storage device needs to absorb power: When ΔP≤-(1-k2)×P f0 When ΔP=-(1-k2)×P f0 That is, the load reduction adjustment required by the thermal power unit is less than or equal to the idle load capacity of the energy storage device: When ΔP>(1-k2)×P f0 When the load required by the thermal power unit for load reduction adjustment is greater than the free load capacity of the energy storage device, the energy storage device is insufficient to meet the load reduction needs, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first absorbs the load until the energy storage device is full, and the remaining part is adjusted by the unit: ΔP=-(1-k2)×P f0 -ΔP L When the thermal power unit is in deep peak load regulation, the output of the thermal power unit is less than the load and the unit needs to increase the load, that is, the energy storage device needs to release power: When ΔP≤k2×P f0 When the load adjustment demand of the thermal power unit is less than or equal to the current maximum output power of the energy storage device: ΔP=k2×P f0 When ΔP>k2×P f0 When the load adjustment demand of the thermal power unit is greater than the current maximum output power of the energy storage device, the energy storage device is insufficient to meet the load increase demand, and the thermal power unit and the energy storage device need to jointly adjust the load; the energy storage device first increases the load to fully release the power, and the remaining part is adjusted by the thermal power unit: ΔP=k2×P f0 +ΔP L 。

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