CN110544033B - Wind power consumption assessment method for power system after flexibility transformation of thermal power plant - Google Patents
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Abstract
The embodiment of the invention discloses a method for evaluating wind power consumption of an electric power system after flexibility transformation of a thermal power plant, which comprises the following steps: s1, determining system parameters of a power system of a thermal power plant; s2, calculating the original wind curtailment power of the power system in each time period when the heat storage tank and the electric boiler are not started according to the system parameters; s3, calculating the minimum output of the whole power system after the heat storage tank and the electric boiler are started based on the set evaluation strategy time by time from the initial time, and determining the running states of each thermoelectric unit, the heat storage tank and the electric boiler in the power system; and S4, calculating and evaluating the total wind curtailment electric quantity of the power system corresponding to each time period required by evaluation. The method can calculate the abandoned wind power and the electric output of the thermal power plant at each time interval, and count the data of the wind power consumption condition of the system after the flexibility transformation of the thermal power plant, the utilization degree of the heat storage and the electric boiler and the like, thereby providing important basis for the power supply planning design of the power system and the flexibility transformation of the thermal power plant.
Description
Technical Field
The invention relates to the technical field of planning and designing of an electric power system, in particular to a wind power consumption assessment method of the electric power system after flexibility transformation of a thermal power plant.
Background
How the wind power consumption condition of the power system after the flexibility of the thermal power plant is improved, namely the evaluation of the wind power consumption condition after the flexibility of the thermal power plant is the important content to be considered when the power system is subjected to power planning and design, and the important basis for selecting the flexibility improvement scheme of the thermal power plant.
In the winter heating period of the 'three north regions' in China, in order to meet the heat supply requirement, the minimum output of the thermoelectric generator set which usually uses heat to determine electricity is improved, so that the space of a system which can receive wind power is reduced, the phenomenon of wind abandon is serious, and one of the methods for improving the wind power absorption capacity of the system is to improve the operation flexibility of the thermoelectric generator set. The improvement of the operation flexibility of the thermoelectric unit means that the electric output adjusting range of the unit is increased on the premise of ensuring the heat supply requirement, and the constraint of 'fixing the power with heat' of the thermoelectric unit is broken.
At present, a more common thermal power plant flexibility transformation scheme is to additionally install a heat storage device and an electric boiler, and compensation heat supply is provided in a waste wind period, so that the heat output of a unit is reduced, the minimum electric output of the unit is further reduced, the adjustable range of the electric output of the unit is improved, and the grid-connected space of wind power is increased. However, the prior art has the following problems that under the condition that the installed capacity of wind power is not changed, the wind power consumption of a system is firstly increased and then tends to be unchanged along with the increase of the capacity of a heat storage device, because the heat storage device can only reduce the electric output of a unit to the minimum electric output, the unit cannot be assisted to carry out deep peak shaving, the consumed wind curtailment amount is limited, although an electric boiler is additionally arranged, the heat supply is compensated by utilizing the electric quantity before the grid connection of a thermoelectric unit according to the operation principle of the electric boiler, the grid-connected electric output of the unit is reduced, and the deep peak shaving and wind curtailment can be realized. However, the capacities of the heat storage and the electric boiler are different, the wind power consumption conditions of the system are also different, and certain problems still exist, and the method is as follows:
the existing evaluation of the wind power consumption condition of a system after the flexibility of a thermal power plant is transformed mainly comprises two methods: one method is to establish a short-term scheduling model only containing heat storage or containing both heat storage and an electric boiler, and the effect of improving the wind power consumption capacity of the heat storage or the electric boiler is simulated and analyzed from a time scale of day, but because a mathematical model adopted during actual simulated scheduling operation often has a certain difference with an actual scheduling mode of a power grid, and data representing a future state during simulated operation are numerous and difficult to accurately predict, the superiority of accurate modeling is difficult to reflect; one method is to establish a time sequence simulation analysis model to perform medium-term and long-term simulation analysis on a system, but the differences of the heat load and the flexibility improvement of each thermal power plant are not considered, the analysis result can only reflect the overall operation condition of various power supplies but cannot reflect the specific condition of each power plant, and effective reference is difficult to provide for formulating a flexibility improvement scheme for a specific thermal power plant.
Therefore, a method for avoiding establishing a complex optimization scheduling model and evaluating the wind power consumption condition of a system after a heat storage device and an electric boiler are additionally arranged in a thermal power plant on the basis of considering the difference of each thermal power plant is needed.
Disclosure of Invention
Based on the method, in order to overcome the defects in the prior art, the wind power consumption assessment method for the power system after flexibility transformation of the thermal power plant is particularly provided.
A wind power consumption assessment method for an electric power system after flexibility transformation of a thermal power plant is characterized by comprising the following steps:
s1, determining system parameters of an electric power system of a thermal power plant, wherein the system parameters comprise power generation load, wind power, unit parameters, starting and stopping states of each unit at different time intervals, heat load of the electric power system of the thermal power plant and capacities of a heat storage device and an electric boiler configured in the electric power system of the thermal power plant;
s2, calculating the original abandoned wind power of the power system in each period when the heat storage device and the electric boiler are not started according to the system parameters;
s3, calculating the minimum output of the whole power system after the heat storage device and the electric boiler are started based on the set evaluation strategy from initial time to time, determining running state models of each thermoelectric unit, the heat storage device and the electric boiler in the power system, and calculating the heat storage/release amount of the heat storage device of the power system in a certain time;
and S4, calculating and evaluating the wind curtailment electric quantity consumed by the electric power system after the flexibility of the thermal power plant is improved.
Optionally, in one embodiment, the original wind curtailment power of the system in each period when the heat storage device and the electric boiler are not started is denoted as P t W,C,0 The corresponding calculation formula is
P t W,C,0 ＝|min(0,P t DX -P t SYS,0 )|
Wherein, subscript t represents each time interval, t =1, …, T, T are evaluation time, superscript W, C represents wind curtailment, and system equivalent load P t DX ＝D t -P t W ，D t Electric power system load, P, representing a period of t t W Representing the wind power output of the power system in the t time period;P t SYS,0 and the minimum output of the power system when the heat storage device and the electric boiler are not started in the period of t is represented, and the minimum output is obtained by summing the minimum electric outputs of all starting power supplies in the power system.
Optionally, in one embodiment, the step S3 of calculating, from an initial period to a time period based on the set evaluation strategy, a minimum output of the entire power system after the heat storage device and the electric boiler are started, determining an operation state model of each thermoelectric unit, the heat storage device, and the electric boiler in the power system, and calculating a heat storage/release amount of the heat storage device of the power system in a certain time period includes:
s31, judging whether the original wind curtailment power is 0, if so, executing S32, and otherwise, executing S33;
s32, when the time period t is determined, determining the heat storage required power corresponding to the heat storage device of each thermoelectric unit in the power system and the power increasing and generating power of each thermoelectric unit, further determining the overall minimum electric output of the power system in the time period, and executing S34;
s33, when the time period t is determined, determining the overall minimum electric output of each thermoelectric unit, each heat storage and electric boiler in the electric power system and the maximum peak reduction power which can be provided by all the thermoelectric units in the electric power system, distributing the actual peak reduction amount of the whole electric power system to each thermoelectric unit after determining the actual peak reduction amount, determining the overall minimum electric output of the electric power system in the time period and executing S34;
and S34, determining the corresponding operating states of each thermoelectric unit, each heat storage device and each electric boiler in the power system, and calculating the heat storage/release amount of the heat storage device of the power system in a certain period.
Optionally, in an embodiment, when the time period t is determined in S32, the step of determining the overall minimum electrical output of the power system in the time period and executing S34 includes:
s321, when the time period t is determined, the heat storage required power corresponding to the heat storage device of each thermoelectric unit in the power system is calculated by the formula of any thermoelectric unit i
Wherein,
in order to be the capacity of the heat storage device,
the residual heat of the heat storage device in the last period,
the maximum heat storage power of the heat storage device;
s322, when the time period t is determined, the expected generated power increasing amount of each thermoelectric unit in the power system is summed to obtain the total generated power increasing amount of the power system in the time period, and for any thermoelectric unit i, the corresponding generated power increasing amount calculation formula is
Wherein H i,max For maximum extraction and heating power H of thermoelectric generator set i i,t For the heating power of the thermoelectric power plant i, c i,m Is the electric heating output ratio of the thermoelectric unit i under the back pressure working condition,
increasing the total generated power of the power system for the time t;
s323, determining the power increasing and generating power of each thermoelectric unit, wherein the corresponding calculation formula is
Wherein,
representing the remaining power generation space of the power system for the time period t;
s324, determining the overall minimum electric power of the electric power system in the period and executing S34, wherein the corresponding calculation formula is
Wherein,
the minimum output of the thermoelectric power unit i in the mode of operating by using heat and fixed electricity, namely
The minimum electric output of the thermoelectric unit i under the pure condensing working condition, c i,v2 The reduction value H of electric power is the reduction value H of electric power when the unit heat supply heat is extracted at a certain time for the air inflow under the minimum electric output corresponding to the thermoelectric unit i i,0 Constant, the intersection value H of the back pressure working condition curve corresponding to the thermoelectric unit i and the abscissa of the coordinate system where the curve is located C The thermal output is the corresponding thermal output when the thermoelectric unit i has the minimum electrical output under the back pressure working condition.
Optionally, in an embodiment, when the time period t is determined in S33, the step of determining the actual peak reduction amount of the entire power system, distributing the actual peak reduction amount to each thermoelectric unit, determining the overall minimum electric output of the power system at the time period, and executing S34 includes:
s331, when the time period t is determined, the overall minimum electric power of each thermoelectric unit, each heat storage unit and each electric boiler in the electric power system is calculated according to the corresponding calculation formula
Wherein:
s332, determining the maximum peak reduction power which can be provided by all thermoelectric units in the power system, wherein the corresponding calculation formula is
Wherein,
the maximum peak-load reduction power can be provided for the thermoelectric unit i;
s333, determining the actual peak load shedding amount of the whole power system, wherein the corresponding calculation formula is
And S334, distributing the actual peak load shedding amount of the whole power system to each thermoelectric unit to determine the peak load shedding amount corresponding to the thermoelectric unit i so as to calculate the whole minimum electric output of the power system in the period and execute S34.
Optionally, in one embodiment, the step of distributing the actual peak shaving amount of the entire power system to each thermoelectric power unit in S334 includes:
s3341, maximum peak load reduction of the thermoelectric unit i in the t period
Dividing peak-adjusting compensation gears, determining the total peak-adjusting amount that can be called by the thermoelectric unit i at each level of peak-adjusting compensation gears, and distributing the total peak-adjusting amount to each peak-adjusting compensation gear to determine the peak-adjusting amount corresponding to each gear;
s3342, based on the set distribution proportion of each thermoelectric unit in each gear, determining the down-peak regulation amount corresponding to the thermoelectric unit i, further calculating the overall minimum electric output of the electric power system in the time period, and executing S34, wherein the overall minimum electric output calculation formula of the electric power system in the time period is as follows
Wherein f is the divided gear stage number,
and the peak value is the down-regulation peak value corresponding to the thermoelectric unit i in the f-th gear.
Optionally, in one embodiment, the step of determining the operating states corresponding to each thermoelectric power unit, the heat storage device, and the electric boiler in the power system and calculating the heat storage/release amount of the heat storage device of the power system in a certain period in S34 includes:
s341, determining electric output corresponding to thermoelectric unit i
Thermal output
The model of the heat storage quantity and the running state of the electric boiler in the period specifically comprises the following parts:
(1) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
The running state model of the electric output corresponding to the thermoelectric unit i in the time period
Thermal output
Operating state model, residual heat of heat storage device and electricity in the periodThe operating state model of the boiler over this period is represented as:
wherein,
the maximum output of the thermoelectric power unit i in the mode of operating by using the fixed heat and electricity is expressed as
The maximum electric output of the thermoelectric unit i under the pure condensing working condition, c i,v1 The electric power reduction value is the electric power reduction value when the unit heat supply quantity is extracted at a certain time for the air input quantity under the maximum electric output corresponding to the thermoelectric unit i,
for the thermoelectric power unit i under the condition that the heat load is H i,t The minimum output force under the operation mode of using the heat to fix the electricity,
for the thermoelectric power unit i under the condition that the heat load is H i,t The maximum output force under the mode of operation by using heat to fix the electricity is adopted;
(2) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
wherein,
for the flexibility reform transform back thermal power plant power system's whole electricity export upper limit, show as:
and is
(3) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
(4) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
wherein,
(5) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
s342, according to P i,t Time interval-by-time interval summation calculation for obtaining minimum electric output of system after flexibility modification of thermal power plantP t SYS,1 (ii) a And calculating the abandoned wind power of each time period after the transformation to determine the abandoned wind power P of the electric power system after the transformation t W,C,1 The corresponding calculation formula is P t W,C,1 ＝|min(0,P t DX -P t SYS,1 )|。
Optionally, in one embodiment, the step of calculating the amount of curtailed wind power consumed by the power system with the modified thermal power plant flexibility in S4 includes
The general formula of the calculation of the total abandoned wind power of the power system corresponding to each time interval is
Then, the corresponding abandoned wind power before the flexibility modification of the thermal power plant
Abandoned wind power after flexibility transformation of thermal power plant
The waste wind power consumed by the flexibility modification of the thermal power plant is
The embodiment of the invention has the following beneficial effects:
after the technology is adopted, the tradition is solved.
The method can calculate the abandoned wind power and the power output of the thermal power plant at each time interval, and count the data such as the wind power consumption condition of the system after the flexibility transformation of the thermal power plant, the utilization degree of the heat storage and the electric boiler, and the like, so as to help a planning decision maker to evaluate the wind power consumption condition after the transformation, and provide important basis for power supply planning design of the power system and the flexibility transformation of the thermal power plant.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a flow chart of a technique according to an embodiment of the present invention;
FIG. 2 is an electric heating operation interval of a conventional thermoelectric unit;
FIG. 3 illustrates a flexible thermoelectric plant thermoelectric operating region according to one embodiment of the present invention;
FIG. 4 is a fan abandon diagram according to the present invention;
FIG. 5 is a schematic diagram of wind power consumption of a power system including a flexible thermal power plant according to an embodiment of the present invention;
fig. 6 is a diagram showing the power balance in a certain cycle of heating in the embodiment of the present invention.
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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application. The first and second elements are both elements, but they are not the same element.
In order to solve the defects in the prior art, in the embodiment, a method for evaluating wind power consumption of an electric power system after flexibility transformation of a thermal power plant is particularly provided, so that the calculation of the abandoned wind power of the electric power system after a thermal storage tank and an electric boiler are configured in the thermal power plant is realized; the invention provides a wind power consumption capacity evaluation method of an electric power system with a flexible thermal power plant on the basis of traditional peak regulation balance analysis, and the method establishes a mathematical model with heat storage and an electric boiler for each thermal power plant according to objective reality of thermal power local balance and electric power whole network balance; determining operation strategies of heat storage and electric boilers in each thermal power plant according to the principles of maximum peak regulation capacity, minimum energy consumption and fair scheduling; wind power acceptance of the whole power grid is determined through time-interval peak-shaving balance analysis, so that a simple and effective analysis tool is provided for system planning decision; as in fig. 1-6; the method comprises the following specific steps: s1, determining system parameters of an electric power system of a thermal power plant, wherein the system parameters comprise power generation load, wind power, unit parameters, on-off states of all units at different time intervals, heat load of the electric power system of the thermal power plant and capacities of a heat storage device and an electric boiler configured in the electric power system of the thermal power plant; s2, calculating the original abandoned wind power of the power system in each period when the heat storage device and the electric boiler are not started according to the system parameters; s3, calculating the minimum output of the whole power system after the heat storage device and the electric boiler are started based on the set evaluation strategy from initial time to time, determining running state models of each thermoelectric unit, the heat storage device and the electric boiler in the power system, and calculating the heat storage/release amount of the heat storage device of the power system in a certain time; and S4, calculating and evaluating the abandoned wind power consumed by the power system after the flexibility of the thermal power plant is improved. The method can calculate the abandoned wind power and the power output of the thermal power plant at each time interval, and count the data such as the wind power consumption condition of the system after the flexibility transformation of the thermal power plant, the utilization degree of the heat storage and the electric boiler and the like to help a planning decision maker to evaluate the wind power consumption condition after the transformation, thereby providing important basis for power supply planning design of the power system and the flexibility transformation of the thermal power plant.
In some specific embodiments, the original wind curtailment power of each period of the system when the heat storage device and the electric boiler are not started in S2 is denoted as P t W,C,0 Corresponding formula of calculation is
P t W,C,0 ＝|min(0,P t DX -P t SYS,0 )|
Wherein, subscript t represents each time interval, t =1, …, T, T are evaluation time, superscript W, C represents wind curtailment, and system equivalent load P t DX ＝D t -P t W ，D t Electric power system load, P, representing period t t W Representing the wind power output of the power system at the time interval t, namely calculating the equivalent load P of the system according to the system load and the wind power output t DX ；P t SYS,0 The minimum output of the power system is represented when the heat storage device and the electric boiler are not started in the time period t, the heat storage device mainly comprises a heat storage tank, the minimum output is obtained by summing the minimum output of a starting power supply of each thermoelectric unit in the power system, the minimum output of the starting power supply is obtained according to the existing auxiliary service management method of the grid-connected power plant and the operation experience of each thermoelectric plant, wherein the starting capacity of each thermoelectric unit is based on an energy-saving scheduling principle and according to the peak adjustable capacity required by the day (according to the maximum load of the day)And spare capacity); the specific minimum power calculation process of the boot power supply is a conventional technique, and is not improved in this example, so this example is not limited in particular.
In some specific embodiments, the step S3 of calculating, from an initial period to a period based on the set evaluation strategy, a minimum output of the entire power system after the heat storage device and the electric boiler are started, determining an operation state model of each thermoelectric unit, the heat storage device, and the electric boiler in the power system, and calculating a heat storage/release amount of the heat storage device of the power system in a certain period includes:
s31, judging whether the original wind curtailment power is 0, if so, executing S32, and otherwise, executing S33;
s32, when the time period t is determined, determining the heat storage required power corresponding to the heat storage device of each thermoelectric unit in the power system and the increased power generation power of each thermoelectric unit, further determining the integral minimum power output of the power system in the time period, and executing S34; the reason why whether the original wind abandoning power is 0 is judged is that when no wind abandoning exists in the power system, the part of the power generation space (referred to as residual power generation space) with the equivalent load larger than the minimum output of the power system before modification can be distributed to the thermoelectric power unit, so that the power generation power of the thermoelectric power unit is larger than the power generation power of the "fixed power by heat (fixed power by heat is an operation mode of the cogeneration system for determining the power generation amount according to the size of the heat supply load)". Therefore, the thermoelectric unit can utilize multiple opportunities of power generation to carry out co-production heat supply, and heat is stored for the heat storage device for heat release in the subsequent wind abandoning period. Further, in one embodiment, the step of determining the total minimum power of the power system and executing the step S34 includes, when the t-time period is determined in S32, determining the heat storage demand power corresponding to the heat storage device of each thermoelectric unit in the power system and the increased power generation power of each thermoelectric unit, and the step S321, when the heat storage demand of each heat storage device is determined, that is, when the t-time period is determined, the heat storage demand power corresponding to the heat storage device of each thermoelectric unit in the power system is first determined, and for any thermoelectric unit i, in order to fully store the heat storage device of the unit as soon as possible, the calculation formula of the corresponding heat storage demand power is that
Wherein,
in order to be the capacity of the heat storage device,
the remaining heat of the heat storage device in the last period (which corresponds to zero for the initial time),
the maximum heat storage power of the heat storage device; s322, when the time period t is determined, the expected generated power increasing amount of each thermoelectric unit in the power system is summed to obtain the total generated power increasing amount of the power system in the time period, namely only H can be increased considering that the thermal power of each thermoelectric unit in the time period is maximum i,max -H i,t (H i,max For maximum extraction heating power of unit i, H i,t The heating power of the unit i), therefore, for any thermoelectric unit i, the expected generated power increase in the period is calculated by the formula
Wherein H i,max For maximum extraction and heat supply power H of thermoelectric unit i i,t For the heating power of the thermoelectric power plant i, c i,m The accumulated expected total generated power increment is obtained by summing the electric heat output ratio of the thermoelectric unit i under the back pressure working condition
Namely, it is
Increasing the total generated power of the power system for the time t; s323, considering that the residual generating space of the system in the period of time is possibly smaller than the total generating power increment expected by all thermal power plants, distributing the generating power increments according to the proportion of the generating power increments of the units to meet the fairness principle, and determining each thermal motorThe increased generating power of the group is calculated by the formula
Wherein,
representing the remaining power generation space of the power system for the time period t; s324, increasing the generating power of each unit
Minimum output of stacked thermoelectric unit for' fixing electricity with heat
The corrected minimum electric output of the unit in the time interval can be obtained, namely the overall minimum electric output of the electric power system in the time interval is determined and S34 is executed, and the corresponding calculation formula is
Wherein,
the minimum output of the thermoelectric power unit i in the mode of operating by using heat and fixed electricity, namely
The minimum electric output of the thermoelectric unit i under pure condensation condition, c i,v2 The reduction value H of electric power is the reduction value H of electric power when the unit heat supply heat is extracted at a certain time for the air inflow under the minimum electric output corresponding to the thermoelectric unit i i,0 Constant, the intersection value H of the back pressure working condition curve corresponding to the thermoelectric unit i and the abscissa of the coordinate system where the curve is located C The thermal output is the corresponding thermal output when the thermoelectric unit i has the minimum electrical output under the back pressure working condition.
S33, when the time period t is determined, the overall minimum electric output of each thermoelectric unit, each heat storage boiler and each electric boiler in the electric power system and all the thermoelectric units, the heat storage boilers and the electric boilers in the electric power systemDetermining the actual peak load reduction amount of the whole power system, then distributing the determined peak load reduction amount to each thermoelectric unit, determining the integral minimum electric power of the power system in the period, and executing S34, so that when waste wind exists in the system, each thermal power plant needs to start a heat storage device and an electric boiler, the on-line power of the power plant is reduced, and the waste wind is absorbed; further, in one embodiment, when the time period t is determined in S33, the steps of determining the actual peak reduction amount of the entire power system, allocating the determined actual peak reduction amount to each thermoelectric unit, determining the minimum electric output of the entire power system in the time period, and executing S34 include: s331, when the time period t is determined, the overall minimum electric power of each thermoelectric unit, each heat storage unit and each electric boiler in the modified electric power system is calculated according to the corresponding calculation formula
Wherein:
is the maximum operating power, eta, of the electric boiler i In order to improve the electric heat conversion efficiency of the electric boiler,
for the maximum heat release power of the heat storage device during the period t,
the maximum heat release power of the heat storage device is determined by the heat storage amount at the end of the last period of the heat storage device and the maximum heat release power thereof and is a dynamic value, wherein
The heat storage amount at the last period of the heat storage device is the heat storage amount at the last period of the heat storage device;
the maximum heat release power of the heat storage device; s332, calculating and determining the maximum down-peak power which can be provided by all thermoelectric units in the power system and can be provided by the reconstructed unit through the minimum output, namely the corresponding calculation formula is
Wherein,
the maximum peak-load reduction power which can be provided by the thermoelectric power unit i,
the minimum output of 'fixing electricity with heat' of the thermal power plant is obtained; s333, determining the actual peak load regulation amount of the whole power system, wherein the corresponding calculation formula is
And S334, distributing the actual peak load shedding amount of the whole power system to each thermoelectric unit to determine the peak load shedding amount corresponding to the thermoelectric unit i so as to calculate the whole minimum electric output of the power system in the period of time and execute S34. Further, in one embodiment, the step of allocating the actual peak shaving amount of the whole power system to each thermoelectric power unit in S334 includes: s3341, maximum peak load reduction of the thermoelectric unit i in the t period
Dividing peak-adjusting compensation gears, determining the total peak-adjusting amount that can be called by the thermoelectric unit i at each level of peak-adjusting compensation gears, and distributing the total peak-adjusting amount to each peak-adjusting compensation gear to determine the peak-adjusting amount corresponding to each gear; s3342, based on the set distribution proportion of each thermoelectric unit in each gear, determining the down-peak regulation amount corresponding to the thermoelectric unit i, further calculating the overall minimum electric output of the electric power system in the time period, and executing S34, wherein the overall minimum electric output calculation formula of the electric power system in the time period is as follows
Wherein f is the divided gear stage number,
and the peak reduction amount is corresponding to the thermoelectric unit i in the f-th gear. The specific peak-down regulation is illustrated as 3 grades: due to the current peak shaving market (northeast power-assisted service market operating rule (tentative) [ Z)]) When the power output rate of the thermal power plant on the network is lower than 50%, peak regulation compensation is required, so that the distribution of the peak regulation amount is carried out on the principle that the overall peak regulation cost of the power system is minimum: the lower peak regulation is divided into 3 grades: basic peak regulation without compensation; 50% of i ～40％C i 0-400 yuan/MW;<40％C i 400-1000 yuan/MW (wherein, C) i The capacity of unit i). Therefore, the peak shaving amount distribution is carried out in the following sequence: basic peak shaving capacity, 1 gear peak shaving capacity and 2 gear peak shaving capacity; i.e. maximum turndown of thermoelectric generator set i in the period
According to basic peak regulation, deep regulation 1 gear and deep regulation 2 gear>50％C i 、50％C i ～40％C i 、<40％C i Third gear, the peak load shedding amount of each gear is as follows:
the total quantity of the down peak which can be called by the system in each gear is calculated to be
Secondly, the calculated overall down-peak amount is assigned to each gear, i.e.
Then distributing the total amount of each gear to each unit according to the proportion of the peak shaving amount of each gear of each unit,
finally, the meterCalculating the electrical output of the thermoelectric power units, i.e.
And S34, determining the corresponding operating states of each thermoelectric unit, each heat storage device and each electric boiler in the power system, and calculating the heat storage/release amount of the heat storage device of the power system in a certain period. The step is to utilize the obtained integral power output P of the thermal power plant i,t And the thermal load H borne by the thermal power plant i,t In combination with the coordinated operation in the thermal power plant, the operating states of the thermal power unit, the thermal storage unit and the electric boiler are calculated, that is, the operating state is known from S1, the key of the wind power rejection of the calculation system is the minimum output of the calculation system, the minimum output of the system in each time period after the flexibility of the thermal power plant is improved is mainly related to the initial real-time heat of the thermal storage unit in each time period, in order to calculate the initial real-time heat of the thermal storage unit in each time period, the thermal storage amount or the thermal release amount of the thermal storage unit in the previous time period needs to be calculated, and as the thermal output and the electric output of the thermal power plant are realized by the coordinated operation of the thermal power unit, the thermal storage unit and the electric boiler together, the operating state models of the thermal storage unit, the thermal storage unit and the electric boiler at different operating points need to be established to calculate the thermal storage amount and the thermal release amount of the thermal storage unit in the time period. Further, in one embodiment, the step of determining the operating states of the thermoelectric generation units, the heat storage device and the electric boiler in the power system and calculating the heat storage/release amount of the heat storage device of the power system in a certain period in S34 includes: s341, determining an operation state model of the electric output corresponding to the thermoelectric unit i in the time period
Operating state model of thermal output in the period
The model of the residual heat storage amount and the running state of the electric boiler in the period specifically comprises the following parts: (1) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
The electric output corresponding to the thermoelectric unit i
Operating state model, thermal output during this period
The operating state model, the remaining amount of heat storage, and the operating state model of the electric boiler during the period are expressed as:
wherein,
the maximum output of the thermoelectric power unit i in the mode of operating by using the fixed heat and electricity is expressed as
The maximum electric output of the thermoelectric unit i under the pure condensing working condition, c i,v1 The reduction value of the electric power is the reduction value of the electric power when the unit heat supply quantity is extracted at a certain time for the air inflow under the maximum electric output corresponding to the thermoelectric unit i; (2) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
Or
The electric output corresponding to the thermoelectric unit i
Operation state in the periodState model, thermal output
The operating state model, the remaining amount of heat storage, and the operating state model of the electric boiler during the period are expressed as:
wherein,
for the flexibility reform transform back thermal power plant power system's whole electricity export upper limit, show as:
and is
(3) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
(4) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
(5) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
In an embodiment, the step of calculating the amount of the curtailed wind power consumed by the power system after the thermal power plant is flexibly modified in S4 includes calculating the total amount of the curtailed wind power of the power system corresponding to each time period by a general formula of
Then, the corresponding abandoned wind power before the flexibility modification of the thermal power plant
Abandoned wind power after flexibility transformation of thermal power plant
The waste wind power consumed by the flexibility modification of the thermal power plant is
During the evaluation process
The larger the air volume is, the more the air volume is abandoned due to the flexibility modification.
Based on the technical scheme, the unit parameters of the specific embodiment of the invention are shown in table 1, the starting capacity of various power supplies of the thermoelectric unit is shown in table 2, wherein the minimum output of the system when the heat storage and the electric boiler are not started in the initial period is calculated as follows:P t SYS 8600MW, t =0; is calculated byInitial period system equivalent load, namely initial period electric load D t Is 10034MW, wind power output P t W Is the mixed gas of the carbon dioxide and the carbon dioxide, is 430MW,
the equivalent load is: p t DX ＝D t -P t W Calculated reconstructed abandoned wind power P of =10034-430=9604MW t W,C ＝|min(0,P t DX -P t SYS ) L =0MW; starting from the initial time period, calculating the minimum output of the thermal power plant after starting the heat storage device and the electric boiler time by time period, wherein the transformation scheme of the thermal power plant is shown in a table 3:
TABLE 1 original wind curtailment power, thermal power plant unit parameters for each period of the system, typically without starting the thermal storage tank and the electric boiler
TABLE 2 boot capacities (Unit MW) of the various power supplies
TABLE 3 thermal power plant revamping scheme
According to the scheme, ten thermoelectric units are selected to be additionally provided with heat storage and electric boilers for flexible transformation, the capacity of the additionally arranged heat storage device is that when the electric output of the thermoelectric unit in the middle heating period is reduced to the minimum electric output, the compensation heat supply power required by the heat storage device is multiplied by the heat release hours (the heat release time of the heat storage device is 8 hours by combining the duration time of abandoned wind in the system), the heat quantity of the heat storage device is 0 in the initial period, and the electric boilers are configured according to 20% of the installed capacity of each thermoelectric unit. Because no wind is abandoned before transformation, S32 is executed, the thermal power plant improves the thermal output to store heat of the heat storage device, and the minimum output of the thermal power plant is shown in Table 4:
TABLE 4 minimum output (unit MW) of thermal power plant after heat storage for heat storage device
The real-time heat of the heat storage device at the end of the period (i.e. at the beginning of the next period) is shown in table 5:
TABLE 5 Heat storage device real-time heat at the end of this time interval (Unit MWh)
S3: and circulating the steps, and calculating the total abandoned wind power and the peak regulation subsidy cost of the system: namely, the wind power abandon before the modification is 4.98 hundred million kW.h, and the wind power abandon after the modification is 1.1 hundred million kW.h. Therefore, the wind power consumption effect of the system is obvious after the flexibility of the thermal power plant is improved.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A wind power consumption assessment method for an electric power system after flexibility transformation of a thermal power plant is characterized by comprising the following steps:
s1, determining system parameters of an electric power system of a thermal power plant, wherein the system parameters comprise power generation load, wind power, unit parameters, starting and stopping states of each unit at different time intervals, heat load of the electric power system of the thermal power plant and capacities of a heat storage device and an electric boiler configured in the electric power system of the thermal power plant;
s2, calculating the original wind abandoning power of the power system in each time period when the heat storage device and the electric boiler are not started according to the system parameters;
s3, calculating the minimum output of the whole power system after the heat storage device and the electric boiler are started based on the set evaluation strategy from initial time to time, determining running state models of each thermoelectric unit, the heat storage device and the electric boiler in the power system, and calculating the heat storage/release amount of the heat storage device of the power system in a certain time;
s4, calculating and evaluating the wind curtailment electric quantity consumed by the electric power system after the flexibility of the thermal power plant is improved; and marking the original wind abandoning power of the system at each time interval when the heat storage device and the electric boiler are not started as P t W,C,0 The corresponding calculation formula is
P t W,C,0 ＝|min(0,P t DX -P t SYS,0 )|
Wherein, subscript t represents each time interval, t =1, …, T, T are evaluation time, superscript W, C represents wind curtailment, and system equivalent load P t DX ＝D t -P t W ，D t Electric power system load, P, representing period t t W Representing the wind power output of the power system in the time period t;P t SYS,0 representing the minimum output of the power system when the heat storage device and the electric boiler are not started in the time period t, wherein the minimum output is obtained by summing the minimum output of each starting power supply in the power system;
in the step S3, the step of calculating the minimum output of the entire power system after starting the heat storage device and the electric boiler from the initial time period to the time period based on the set evaluation strategy, determining the operation state models of each thermoelectric unit, the heat storage device and the electric boiler in the power system, and calculating the heat storage/release amount of the heat storage device of the power system in a certain time period includes:
s31, judging whether the original wind curtailment power is 0, if so, executing S32, and otherwise, executing S33;
s32, when the time period t is determined, determining the heat storage required power corresponding to the heat storage device of each thermoelectric unit in the power system and the increased power generation power of each thermoelectric unit, further determining the integral minimum power output of the power system in the time period, and executing S34;
s33, when the time period t is determined, determining the overall minimum electric output of each thermoelectric unit, each heat storage and electric boiler in the electric power system and the maximum peak reduction power which can be provided by all the thermoelectric units in the electric power system, distributing the actual peak reduction amount of the whole electric power system to each thermoelectric unit after determining the actual peak reduction amount, determining the overall minimum electric output of the electric power system in the time period and executing S34;
and S34, determining the corresponding operating states of each thermoelectric unit, each heat storage device and each electric boiler in the power system, and calculating the heat storage/release amount of the heat storage device of the power system in a certain period.
2. The method for evaluating wind power consumption of an electric power system after flexibility modification of a thermal power plant according to claim 1, wherein when the time period t is determined in S32, the steps of determining the overall minimum electric power output of the electric power system in the time period and executing S34 include:
s321, when the time period t is determined, the heat storage required power corresponding to the heat storage device of each thermoelectric unit in the power system is calculated by the formula of any thermoelectric unit i
Wherein,
is the capacity of the heat storage device of the thermoelectric power unit i,
the residual heat of the heat storage device of the thermoelectric power unit i in the previous period,
the maximum heat storage power of a heat storage device of the thermoelectric power unit i;
s322, when the time period t is determined, the expected generated power increasing amount of each thermoelectric unit in the power system is summed to obtain the total generated power increasing amount of the power system in the time period, and for any thermoelectric unit i, the corresponding generated power increasing amount calculation formula is
Wherein H i,max For maximum extraction and heating power H of thermoelectric generator set i i,t Power supply to the thermoelectric power plant i, c i,m Is the electric heating output ratio of the thermoelectric unit i under the back pressure working condition,
increasing the total generated power of the power system for the time t;
s323, determining the power increasing and generating power of each thermoelectric unit, wherein the corresponding calculation formula is
Wherein,
representing the remaining power generation space of the power system for the time period t;
s324, determining the overall minimum electric power of the electric power system in the period and executing S34, wherein the corresponding calculation formula is
Wherein,
the minimum output of the thermoelectric power unit i in the mode of operating by using heat and fixed electricity, namely
The minimum electric output of the thermoelectric unit i under the pure condensing working condition, c i,v2 The reduction value H of electric power is the reduction value H of electric power when the unit heat supply heat is extracted at a certain time for the air inflow under the minimum electric output corresponding to the thermoelectric unit i i,0 Is constant and is the intersection value H of the back pressure working condition curve corresponding to the thermoelectric unit i and the abscissa of the coordinate system where the back pressure working condition curve is located C The thermal output is the corresponding thermal output when the thermoelectric unit i has the minimum electrical output under the back pressure working condition.
3. The method for evaluating wind power consumption of an electric power system after flexibility modification of a thermal power plant according to claim 1, wherein when the time period t is determined in S33, the steps of determining the actual peak reduction amount of the whole electric power system, distributing the actual peak reduction amount to each thermoelectric unit, determining the minimum electric power of the whole electric power system in the time period, and executing S34 include:
s331, when the time period t is determined, the overall minimum electric power of each thermoelectric unit, each heat storage unit and each electric boiler in the electric power system is calculated according to the corresponding calculation formula
Wherein:
s332, determining the maximum peak reduction power which can be provided by all thermoelectric units in the power system, wherein the corresponding calculation formula is
Wherein,
the maximum peak-load reduction power can be provided for the thermoelectric unit i;
s333, determining the actual peak load regulation amount of the whole power system, wherein the corresponding calculation formula is
And S334, distributing the actual peak load shedding amount of the whole power system to each thermoelectric unit to determine the peak load shedding amount corresponding to the thermoelectric unit i so as to calculate the whole minimum electric output of the power system in the period and execute S34.
4. The method for evaluating wind power consumption of an electric power system after flexibility modification of a thermal power plant according to claim 3, wherein the step of distributing the actual peak load reduction of the whole electric power system to each thermoelectric power unit in S334 comprises:
s3341, maximum peak load reduction of the thermoelectric unit i in the t period
Carrying out peak regulation compensation gear division, determining the peak regulation total amount which can be called by the thermoelectric unit i at each level of peak regulation compensation gear, and then distributing the peak regulation total amount to each peak regulation compensation gear to determine the peak regulation amount corresponding to each gear;
s3342, based on the set distribution proportion of each thermoelectric unit in each gear, determining the down-peak regulation amount corresponding to the thermoelectric unit i, further calculating the overall minimum electric output of the electric power system in the time period, and executing S34, wherein the overall minimum electric output calculation formula of the electric power system in the time period is as follows
Wherein f is the divided gear stage number,
and the peak reduction amount is corresponding to the thermoelectric unit i in the f-th gear.
5. The method for evaluating wind power consumption of an electric power system after flexibility modification of a thermal power plant according to claim 2 or 3, wherein the step of determining the operating states corresponding to each thermoelectric unit, each heat storage device and each electric boiler in the electric power system and calculating the heat storage/release amount of the heat storage device of the electric power system in a certain period in S34 comprises:
s341, determining electric output force corresponding to thermoelectric unit i
Thermal output
The model of the heat storage quantity and the running state of the electric boiler in the period specifically comprises the following parts:
(1) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
The running state model of the electric output corresponding to the thermoelectric unit i in the time interval
Thermal output
The operation state model in the period, the residual heat of the heat storage device and the operation state model of the electric boiler in the period are expressed as follows:
wherein,
the maximum output of the thermoelectric power unit i in the mode of operating by using the fixed heat and electricity is expressed as
The maximum electric output of the thermoelectric unit i under the pure condensing working condition, c i,v1 The reduction value of the electric power is the reduction value of the electric power when the unit heat supply quantity is extracted at a certain time for the air inflow under the maximum electric output corresponding to the thermoelectric unit i;
(2) If the overall minimum electrical output P of the electrical power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
Or
The running state model of the electric output corresponding to the thermoelectric unit i in the time interval
Thermal output
The operation state model in the period, the residual heat of the heat storage device and the operation state model of the electric boiler in the period are expressed as follows:
wherein,
for the flexibility reform transform back thermal power plant power system's whole electricity export upper limit, show as:
and is provided with
(3) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
The running state model of the electric output corresponding to the thermoelectric unit i in the time interval
Thermal output
The operation state model in the period, the residual heat of the heat storage device and the operation state model of the electric boiler in the period are expressed as follows:
(4) If the overall minimum power output P of the power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
The running state model of the electric output corresponding to the thermoelectric unit i in the time interval
Thermal output
The operation state model in the period, the residual heat of the heat storage device and the operation state model of the electric boiler in the period are expressed as follows:
wherein,
(5) If the overall minimum electrical output P of the electrical power system i,t And the thermal load H borne by the thermal power plant i,t Belong to
The running state model of the electric output corresponding to the thermoelectric unit i in the time interval
Thermal output
The operation state model in the period, the residual heat of the heat storage device and the operation state model of the electric boiler in the period are expressed as follows:
s342, according to P i,t Time interval-by-time interval summation calculation to obtain minimum electric output of system after flexibility modification of thermal power plantP t SYS,1 (ii) a And calculating the abandoned wind power of each time period after the transformation to determine the abandoned wind power P of the electric power system after the transformation t W,C,1 The corresponding calculation formula is P t W,C,1 ＝|min(0,P t DX -P t SYS,1 )|。
6. The method of claim 1, wherein the step of calculating the curtailment wind power consumed by the power system after the flexibility modification of the thermal power plant in S4 comprises
The general formula of the calculation of the total abandoned wind power of the power system corresponding to each time interval is
Then, the corresponding abandoned wind power before the flexibility modification of the thermal power plant
Abandoned wind power after flexibility transformation of thermal power plant
Flexibility improvement of thermal power plantThe wind power is F T W,C，0 -F T W,C,1 。
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