A method and system for formulating output plans for combined heat and power units.

Abstract

A method and system for formulating a heat and power cogeneration unit output plan, comprising: when wind power accommodation space is insufficient, calculating total heat supply that needs to be reduced by a heat and power cogeneration unit based on abandoned wind power generated power and a heat and power cogeneration unit down-regulation principle; then, when wind power accommodation space is in surplus, calculating heat and time that needs to be increased by the heat and power cogeneration unit based on the total heat supply and a heat and power cogeneration unit up-regulation principle; determining a heat and power cogeneration unit output plan curve based on the total heat supply that needs to be reduced by the heat and power cogeneration unit and the heat and time that needs to be increased, utilizing heat storage inertia and thermal inertia of a thermal system, ensuring that heat supply increases / decreases when the heat and power cogeneration unit increases / decreases output when wind power accommodation space is in surplus / deficiency, determining time required for increasing heat of the heat and power cogeneration unit, and solving the problem of the heat and power cogeneration unit increasing output for a long time to store heat when a wind power accommodation space surplus period is relatively long.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power system, in particular to a method and system for formulating heat and power cogeneration unit output plan. BACKGROUND

[0002] At present, the installed capacity of new energy is the largest in the world. However, due to the influence of power supply structure, resource distribution and power grid structure and other factors, the problem of new energy consumption is becoming more and more prominent year by year. Wind power has the characteristics of randomness, volatility and intermittency, and the wind power consumption is directly affected by the regulation capacity of conventional power supply. When the wind power output fluctuation range exceeds the regulation capacity of the power grid, wind power will be abandoned. In some areas, the proportion of thermal power units, especially heat and power cogeneration units, is high. In winter, under the demand of heating, heat and power cogeneration units generally operate in the mode of "heating determines electricity", and the power supply peak shaving capacity is significantly reduced. In order to ensure the active balance of heating and power grid in the low load period, a large amount of wind power is abandoned, which seriously affects the acceptance of wind power. In fact, the thermal system has certain thermal inertia and heat storage characteristics, and the human body is not sensitive to temperature. Therefore, the heat characteristics of the thermal system can be used to adjust the output of the heat and power cogeneration unit to increase the wind power acceptance space. The traditional heat and power cogeneration unit strictly adjusts according to the specified minimum mode of thermal power unit. This adjustment mode is conservative and the adjustment range is small, which reduces the wind power consumption space and utilization rate. SUMMARY

[0003] In order to solve the above-mentioned deficiencies existing in the prior art, the present application provides a method and system for formulating heat and power cogeneration unit output plan.

[0004] The technical scheme provided by the present application is:

[0005] A method for formulating heat and power cogeneration unit output plan, the method comprises:

[0006] When the wind power consumption space is insufficient, based on the wind power generation power and the heat and power cogeneration unit down-regulation principle, the total amount of heat supply that needs to be reduced by the heat and power cogeneration unit is calculated;

[0007] Then, when the wind power consumption space is sufficient, based on the total amount of heat supply and the heat and power cogeneration unit up-regulation principle, the heat and time that need to be improved by the heat and power cogeneration unit are calculated;

[0008] Based on the total amount of heat supply that needs to be reduced by the heat and power cogeneration unit and the heat and time that need to be improved, the output plan curve of the heat and power cogeneration unit is determined.

[0009] Preferably, the total amount of heat supply that needs to be reduced by the heat and power cogeneration unit is calculated based on the wind power consumption space, based on the wind power generation power and the heat and power cogeneration unit down-regulation principle, comprising:

[0010] Based on the time-series data curve of the calculated wind power absorption space, the time when the wind power absorption space is insufficient can be obtained.

[0011] The curtailment period is determined starting from the moment when the wind power absorption capacity is insufficient;

[0012] Based on the aforementioned periods of wind curtailment and the principle of power reduction for combined heat and power (CHP) units, the required power reduction for CHP units is calculated.

[0013] Preferably, the calculation of the time-series data curve of the wind power absorption space includes:

[0014] Obtain the start-up plan of conventional generator units, the forecast of power generation load, and the transaction plan of external transmission tie lines within the forecast period;

[0015] Based on the conventional generator set start-up plan and preset time resolution within the predicted time period, the time-series data curve of the minimum technical output of the generator set is obtained.

[0016] The generation load is obtained based on load forecasting and external transmission tie-line trading plans;

[0017] The difference between the power generation load and the minimum technical output curve of the generator set is calculated to obtain the first wind power absorption spatial time series data curve.

[0018] Preferably, the formula for calculating the total heating supply is as follows:

[0019]

[0020] In the formula, H d_sum Where K is the total heating supply and K is the thermoelectric coupling coefficient. P represents the output value of the nth combined heat and power unit at time tk; n (t k ) represents the nth combined heat and power unit t k Output value after constant adjustment; T k N represents the total duration of wind curtailment during the kth consecutive period; N represents the total number of combined heat and power (CHP) units; and k represents the kth consecutive period of wind curtailment.

[0021] Preferably, the calculation formula for the reduction principle of the combined heat and power unit is as follows:

[0022]

[0023] In the formula, For the nth cogeneration unit t k Minimum output at all times.

[0024] Preferably, the calculation of the required increase in heat and time for the cogeneration unit based on the total heat supply and the adjustment principle of the cogeneration unit includes:

[0025] Based on the calculated time series data curve of wind power consumption space, the time when the wind power consumption space is surplus is obtained;

[0026] Based on the total heat supply and the heat and power cogeneration unit up-regulation principle, the heat and time of the heat and power cogeneration unit that needs to be increased are determined from the time when the wind power consumption space is surplus.

[0027] Preferably, the calculation formula of the heat and power cogeneration unit up-regulation principle is as follows:

[0028]

[0029] In the formula, is the output value of the nth heat and power cogeneration unit at time t k -m k is the output value of the nth heat and power cogeneration unit at time t n (t k -m k ) is the adjusted output value of the nth heat and power cogeneration unit at time t k -m k ; is the maximum output of the heat and power cogeneration unit at time t k -m k ; and m k is the time when the wind power consumption space is surplus.

[0030] Preferably, the heat and time of the heat and power cogeneration unit that needs to be increased are calculated according to the following formula:

[0031]

[0032] In the formula, H i is the heat of the heat and power cogeneration unit that needs to be increased; and m is the time required for the heat of the heat and power cogeneration unit that needs to be increased.

[0033] Preferably, the output planning curve of the heat and power cogeneration unit is determined based on the total heat supply that needs to be reduced and the heat and time that needs to be increased, and includes:

[0034] Obtaining the original output planning curve of the heat and power cogeneration unit;

[0035] Based on the total heat supply that needs to be reduced and the heat and time that needs to be increased, the original output planning curve of the heat and power cogeneration unit is checked;

[0036] If the checked output planning curve of the heat and power cogeneration unit meets the heat supply demand, the checked output planning curve of the heat and power cogeneration unit is determined as the planning curve of the heat and power cogeneration unit;

[0037] Otherwise, the time sequence data of the wind power accommodation space is recalculated, the heat and power cogeneration unit planned curve is determined until the heat supply demand is met, the output plan of the heat and power cogeneration unit after meeting the heat supply demand is determined as the heat and power cogeneration unit planned curve.

[0038] Preferably, the determining of the heat and power cogeneration unit planned curve further comprises:

[0039] The heat and power cogeneration unit output planned curve instruction is sent to the heat and power plant.

[0040] A day-ahead planning system for heat and power combined scheduling, the system comprises:

[0041] The first calculation module is used for calculating the total heat supply that needs to be reduced by the heat and power cogeneration unit based on the abandoned wind power generation and the heat and power cogeneration unit down-regulation principle when the wind power accommodation space is insufficient.

[0042] The second calculation module is used for calculating the heat and time that needs to be increased by the heat and power cogeneration unit based on the total heat supply and the heat and power cogeneration unit up-regulation principle when the wind power accommodation space is sufficient.

[0043] The determination module is used for determining the heat and power cogeneration unit planned curve based on the total heat supply that needs to be reduced by the heat and power cogeneration unit and the heat and time that needs to be increased.

[0044] Preferably, the first calculation comprises an acquisition unit, an increase unit and a stop unit.

[0045] The acquisition unit is used for acquiring the time when the wind power accommodation space is insufficient based on the calculated time sequence data curve of the wind power accommodation space.

[0046] The determination unit is used for determining the abandoned wind power and power limiting period from the time when the wind power accommodation space is insufficient.

[0047] The calculation unit is used for calculating the power that needs to be reduced by the heat and power cogeneration unit based on the abandoned wind power and power limiting period and the heat and power cogeneration unit down-regulation principle.

[0048] Compared with the prior art, the present application has the following beneficial effects:

[0049] The technical scheme provided by the present application comprises: when wind power accommodation space is insufficient, based on abandoned wind power and heat and power cogeneration unit down-regulation principle, total heat supply amount that needs to be reduced by the heat and power cogeneration unit is calculated; then, when wind power accommodation space is surplus, based on the total heat supply amount and heat and power cogeneration unit up-regulation principle, heat and time that need to be promoted by the heat and power cogeneration unit are calculated; based on the total heat supply amount that needs to be reduced by the heat and power cogeneration unit and the heat and time that need to be promoted, an output plan curve of the heat and power cogeneration unit is determined, the heat storage inertia and thermal inertia of the heat system are utilized, when wind power accommodation space is surplus / insufficient, the heat supply amount that is increased / decreased when the output of the heat and power cogeneration unit is promoted / reduced is ensured to be equal, the time required for promoting the heat of the heat and power cogeneration unit is determined, and the problem of long-time promotion of the output of the heat and power cogeneration unit for heat storage when the period of surplus wind power accommodation space is long is solved. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 The whole step flow chart of the preparation of the output plan of the heat and power cogeneration unit of the present application;

[0051] Figure 2 The detailed process schematic diagram of the preparation of the output plan of the heat and power cogeneration unit of the present application. DETAILED DESCRIPTION

[0052] In order to better understand the present application, the content of the present application is further explained below in combination with the drawings and examples of the specification.

[0053] Example 1:

[0054] The present application relates to a day-ahead plan preparation method for heat and power combined scheduling, which considers the heat storage characteristics and thermal inertia of the heat system, increases the output of the heat supply unit for heat storage when wind power accommodation space is surplus, reduces the output of the heat supply unit when wind power accommodation space is insufficient, and improves wind power accommodation while ensuring heat supply.

[0055] The steps of the implementation method are as shown in Figure 2 The method first evaluates day-ahead abandoned wind power according to day-ahead wind power prediction, load prediction and other related data; based on the day-ahead abandoned wind power, adjusts the output plan of the heat and power cogeneration unit under the condition of reducing abandoned wind power as much as possible, and checks whether the output plan of the heat and power cogeneration unit can guarantee user heat supply quality, if not, re-adjusts the output of the heat and power cogeneration unit to meet the user quality; finally, based on the checked output plan of the heat and power cogeneration unit, re-calculates the wind power accommodation space of the system, formulates the corresponding output plan of the wind power field and issues it. The present application utilizes the heat storage characteristics and thermal inertia of the heat system, increases the output of the heat supply unit for heat storage when wind power accommodation space is surplus, reduces the output of the heat supply unit when wind power accommodation space is insufficient, and improves wind power accommodation while ensuring heat supply.

[0056] As shown in Figure 1 , specifically comprising the following steps:

[0057] Step one: when the wind power accommodation space is insufficient, based on the abandoned wind power generation and the heat and power cogeneration unit down-regulation principle, the total amount of heat supply that needs to be reduced by the heat and power cogeneration unit is calculated;

[0058] Step two: when the wind power accommodation space is surplus, based on the total amount of heat supply and the heat and power cogeneration unit up-regulation principle, the heat and time that need to be improved by the heat and power cogeneration unit are calculated;

[0059] Step three: based on the total amount of heat supply that needs to be reduced by the heat and power cogeneration unit and the heat and time that need to be improved, the output plan curve of the heat and power cogeneration unit is determined.

[0060] Among them, step one: when the wind power accommodation space is insufficient, based on the abandoned wind power generation and the heat and power cogeneration unit down-regulation principle, the total amount of heat supply that needs to be reduced by the heat and power cogeneration unit is calculated, including:

[0061] Step 1-1: based on the day-ahead conventional generator start-up plan, including thermal power, hydropower, nuclear power and other types of generating units, the minimum technical output of each unit is accumulated by time, and the day-ahead minimum technical output curve of the whole network is obtained. The minimum technical output curve is time resolution 15min time series data.

[0062] Step 1-2: according to the day-ahead load forecast and the transaction plan of the outgoing tie line, the day-ahead generation load of the whole network is accumulated to obtain the difference between the generation load and the minimum technical output, which is the wind power accommodation space A1.

[0063] Step 1-3: compare the day-ahead wind power prediction with the wind power accommodation space, and the part of the wind power prediction exceeding the wind power accommodation space is identified as the abandoned wind power sequence Q. The abandoned wind power sequence is time resolution 15min time series data.

[0064] Step 1-4: determine whether the day-ahead abandoned wind power is 0, if the day-ahead abandoned wind power is not 0, execute step 2-2, if the day-ahead abandoned wind power is 0, then the heat and power cogeneration unit output plan is not developed, and the process is ended.

[0065] Step 1-5: if there is abandoned wind (Q(t k ) > 0) at time t k , the output of the heat and power cogeneration unit is reduced, and the principle of the output reduction of each heat and power cogeneration unit is:

[0066]

[0067] Based on the heat-electricity relationship of the heat and power cogeneration unit, the total amount of heat supply H d_sum that needs to be reduced by the heat and power cogeneration unit when the output is reduced during the abandoned wind power limiting period is calculated.

[0068]

[0069] K is determined by the heat-electricity relationship of the cogeneration unit.

[0070] Step two: when the wind power accommodation space is sufficient, based on the total heat supply and the cogeneration unit up-regulation principle, the heat and time that the cogeneration unit needs to increase are calculated, including:

[0071] If t k -m, the wind power accommodation space is sufficient (A(t k -m) > 0), the output of the cogeneration unit is increased, and the principle of up-regulation of the output of each cogeneration unit is:

[0072]

[0073]

[0074] When the heat increased by the output increase of the cogeneration unit is greater than H d_sum , that is, H i (t k -m) + H i (t k -m-1) +... + H i (t k -m-m k ) ≥ H d_sum , the output of the cogeneration unit is no longer increased.

[0075] Step three: based on the total heat supply that needs to be reduced and the heat and time that needs to be increased, the output planning curve of the cogeneration unit is determined, including:

[0076] Step 3-1: check whether the output planning of the cogeneration unit meets the heat supply demand of the user, and if it meets the heat supply demand, execute step 3-2. For the output curve of the cogeneration unit that does not meet the heat supply demand, the output curve of the cogeneration unit is adjusted again, and step one is executed.

[0077] Step 3-2: confirm the day-ahead planning curve of the output of the cogeneration unit.

[0078] Embodiment 2:

[0079] Based on the same inventive concept, the application also provides a day-ahead planning system for combined heat and power dispatching, the system comprising:

[0080] A first calculation module: for when the wind power accommodation space is insufficient, based on the abandoned wind power generation and the cogeneration unit down-regulation principle, the total heat supply that needs to be reduced by the cogeneration unit is calculated;

[0081] The second calculation module is configured to calculate the heat and time that the combined heat and power unit needs to increase based on the total heat supply and the increase principle of the combined heat and power unit when the wind power accommodation space is sufficient;

[0082] The determination module is configured to determine the output planning curve of the combined heat and power unit based on the total heat supply that the heat engine unit needs to reduce and the heat and time that the combined heat and power unit needs to increase.

[0083] The first calculation includes an acquisition unit, an increase unit and a stop unit.

[0084] The acquisition unit is configured to acquire the time when the wind power accommodation space is insufficient based on the time sequence data curve of the wind power accommodation space calculated.

[0085] The determination unit is configured to determine the wind curtailment period from the time when the wind power accommodation space is insufficient.

[0086] The calculation unit is configured to calculate the power that the combined heat and power unit needs to reduce based on the wind curtailment period and the decrease principle of the combined heat and power unit.

[0087] Those skilled in the art should understand that embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can 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-ROMs, optical storage devices, etc.) containing computer usable program code.

[0088] The present application is described with reference to flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as combinations of flows and / or blocks in the flowcharts and / or block diagrams, 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 apparatus to produce a machine, so that the instructions that are executed by the processor of the computer or other programmable data processing apparatus generate an apparatus that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in a flow or multiple flows and / or blocks Figure 1 The functions specified in a flow or multiple flows and / or blocks

[0089] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction apparatus that implements the functions specified in the flowcharts and / or block diagrams.Figure 1 one or more processes and / or functions described in the one or more blocks. Figure 1 one or more blocks or multiple blocks.

[0090] These computer program instructions can also be loaded into computer or other programmable data processing devices, so that a series of operation steps are performed on the computer or other programmable data processing devices to generate computer-implemented processes, so that the instructions executed on the computer or other programmable data processing devices provide processes for implementing the flow Figure 1 one or more processes and / or functions described in the one or more blocks. Figure 1 one or more blocks or multiple blocks.

[0091] The above merely illustrates the embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A method for making a thermal power plant output plan, characterized by, The method comprises: When the wind power accommodation space is insufficient, based on the abandoned wind power generation and the cogeneration unit down-regulation principle, the total heat supply amount that needs to be reduced by the cogeneration unit is calculated; Then, when the wind power accommodation space is sufficient, based on the total heat supply amount and the cogeneration unit up-regulation principle, the heat and time that need to be improved by the cogeneration unit are calculated; Based on the total heat supply amount that needs to be reduced by the cogeneration unit and the heat and time that need to be improved, the output plan curve of the cogeneration unit is determined; When the wind power accommodation space is insufficient, based on the abandoned wind power generation and the cogeneration unit down-regulation principle, the total heat supply amount that needs to be reduced by the cogeneration unit is calculated, comprising: Based on the time sequence data curve of the calculated wind power accommodation space, the time when the wind power accommodation space is insufficient is obtained; From the time when the wind power accommodation space is insufficient, the abandoned wind power limiting period is determined; Based on the abandoned wind power limiting period and the cogeneration unit down-regulation principle, the power that needs to be reduced by the cogeneration unit is calculated; The calculation formula of the total heat supply amount is as follows: In the formula, is the total amount of heat supply, is the thermoelectric coupling coefficient; is the nth cogeneration unit is the output value at the moment; is the nth cogeneration unit is the adjusted output value at the moment; is the nth is the total wind curtailment duration of the nth consecutive wind curtailment period; is the total number of cogeneration units; represents the nth consecutive wind curtailment period; The calculation formula of the cogeneration unit down-regulation principle is as follows: In the formula, n th cogeneration unit Minimum output at the time Based on the total heat supply amount and the cogeneration unit up-regulation principle, the heat and time that need to be improved by the cogeneration unit are calculated, comprising: Based on the time sequence data curve of the calculated wind power accommodation space, the time when the wind power accommodation space is sufficient is obtained; From the time when the wind power accommodation space is sufficient, based on the total heat supply amount and the cogeneration unit up-regulation principle, the heat and time that need to be improved by the cogeneration unit are determined; The calculation formula of the cogeneration unit up-regulation principle is as follows: In the formula, is the nth combined heat and power unit is the output value at the time point; is the nth combined heat and power unit is the adjusted output value at the time point; is the maximum output of the combined heat and power unit at the time point is the maximum output of the combined heat and power unit at the time point is the time point at which the wind power consumption space is rich, is the time point at which the wind power consumption space is rich, is the wind power consumption space rich value at the time point, > 0; The heat and time that need to be improved by the cogeneration unit are calculated as follows: In the formula, Q is the heat required to be improved for a combined heat and power unit; When the heat of the cogeneration unit to be increased is greater than , i.e. , the cogeneration unit no longer increases the output, wherein m is the time required for the heat of the cogeneration unit to be increased.

2. The method of claim 1, wherein, The calculation of the time sequence data curve of the wind power accommodation space comprises: The start-up plan of the conventional power generation unit, the power generation load prediction and the transaction plan of the external tie-line in the prediction period are obtained; Based on the start-up plan of the conventional power generation unit in the prediction period and the preset time resolution, the time sequence data curve of the minimum technical output of the power generation unit is obtained; The power generation load is obtained based on the load prediction and the transaction plan of the external tie-line; The difference between the power generation load and the minimum technical output curve of the power generation unit is calculated to obtain the first time sequence data curve of the wind power accommodation space.

3. The method of claim 1, wherein, Based on the total heat supply amount that needs to be reduced by the cogeneration unit and the heat and time that need to be improved, the output plan curve of the cogeneration unit is determined, comprising: The original output plan curve of the cogeneration unit is obtained; Based on the total heat supply amount that needs to be reduced by the cogeneration unit and the heat and time that need to be improved, the original output plan curve of the cogeneration unit is checked; If the checked output plan curve of the cogeneration unit meets the heat supply demand, the checked output plan curve of the cogeneration unit is determined as the plan curve of the cogeneration unit; Otherwise, the time sequence data of the wind power accommodation space is recalculated to determine the plan curve of the cogeneration unit until the heat supply demand is met, and the output plan of the cogeneration unit that meets the heat supply demand is determined as the plan curve of the cogeneration unit.

4. The method of claim 1, wherein, After determining the output plan curve of the cogeneration unit, the following steps are further included: The output plan curve instruction of the cogeneration unit is sent to the cogeneration power plant.

5. A day-ahead scheduling system for the co-scheduling of thermal and electrical power, for use in the method of claims 1-4, characterized in that, The system comprises: The first calculation module is configured to calculate the total amount of heat supply that needs to be reduced by the cogeneration unit based on the power abandoned due to insufficient wind power accommodation space and a down-regulation principle of the cogeneration unit when the wind power accommodation space is insufficient; The second calculation module is configured to then calculate the heat and time that need to be increased by the cogeneration unit based on the total amount of heat supply and an up-regulation principle of the cogeneration unit when the wind power accommodation space is sufficient; The determination module is configured to determine the output planning curve of the cogeneration unit based on the total amount of heat supply that needs to be reduced by the cogeneration unit and the heat and time that need to be increased by the cogeneration unit; The first calculation includes: obtaining a time when the wind power accommodation space is insufficient based on a time sequence data curve of the wind power accommodation space calculated; determining a power abandonment and power cut period from the time when the wind power accommodation space is insufficient; calculating the power that needs to be reduced by the cogeneration unit based on the power abandonment and power cut period and a down-regulation principle of the cogeneration unit; The calculation formula of the total amount of heat supply is as follows: In the formula, is the total amount of heat supply, is the thermoelectric coupling coefficient; is the nth heat and power cogeneration unit is the output value at the moment; is the nth heat and power cogeneration unit is the adjusted output value at the moment; is the nth total wind curtailment duration of the nth continuous wind curtailment period; is the total number of heat and power cogeneration units; represents the nth continuous wind curtailment period.

Images