CN111695764A - Thermal power plant energy regulation and control system containing energy storage hydrogen production hybrid system and regulation and control method - Google Patents
Thermal power plant energy regulation and control system containing energy storage hydrogen production hybrid system and regulation and control method Download PDFInfo
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Abstract
The invention discloses a thermal power plant energy regulation and control system containing an energy storage and hydrogen production hybrid system and a regulation and control method, wherein the system comprises a thermal power unit, an energy storage system, a hydrogen production system and a scheduling control system; electric energy transmission channels are respectively arranged between the energy storage system, the hydrogen production system and the thermal power generating unit; the scheduling control system receives external scheduling instruction information and obtains scheduling output target data in the external scheduling instruction information, and controls the operation of the thermal power generating unit, the energy storage system and/or the hydrogen production system according to the scheduling output target data so that the final output of the thermal power plant conforms to the scheduling output target data; the final output of the thermal power plant is the output of the thermal power unit, or the residual output of the thermal power unit after the output of the thermal power unit is consumed by the energy storage system and/or the hydrogen production system, or the sum of the outputs of the thermal power unit and the energy storage system in the discharge state. According to the invention, the energy storage-hydrogen production hybrid system is configured in the thermal power plant, so that the resource utilization efficiency of the thermal power plant and the whole power grid is improved, the problem of new energy consumption is relieved, and the economic loss under deep peak shaving of the thermal power plant can be compensated.
Description
Technical Field
The invention relates to the technical field of power grid regulation, in particular to a thermal power plant energy regulation system containing an energy storage hydrogen production hybrid system and a regulation method.
Background
In recent years, clean energy such as wind energy and solar energy is rapidly developed, and renewable energy such as wind power and photovoltaic power generation has higher and higher installed proportion, and has certain influence on safe and stable operation of a power system. Wind power output generally has the characteristics of intermittence and randomness, the output is high mainly in spring and autumn and winter, the load of a power grid is small at the moment, the peak load regulation pressure of the system is larger and larger, and even a wind abandoning and electricity limiting phenomenon to a certain degree can occur.
In view of the above, the construction of the peak shaving auxiliary service market has been started in various places, and a new mechanism for establishing the sharing of the peak shaving auxiliary service is explored. The auxiliary peak shaving service mainly aims at thermal power generating units and thermoelectric units, and the coastal region also comprises nuclear power generating units. The peak regulation reference value is about 50% generally, and the 'step type' peak regulation service is adopted to distinguish the peak regulation price limit of the load rate below 40% and about 40% -50%, and the northern area also distinguishes the heat supply period and the non-heat supply period. If the dispatching mechanism requires the unit output to be above the reference value of the compensated peak regulation, the unit belongs to the uncompensated peak regulation of the dispatching mechanism, and the peak regulation is below the reference value, and the settlement of the deep peak regulation amount is carried out according to the output and the total electric quantity.
Due to the problems of insufficient consumption and the like when new energy is generated greatly, most thermal power generating units participate in auxiliary peak regulation service to obtain deep peak regulation compensation by reducing output when the new energy is generated greatly, and the situation that the power demand is more tight and frequent is very few. Therefore, the existing method cannot realize better balance for the consumption of new energy when the new energy is generated greatly and the output of the thermal power plant when the electric power is slightly tight in summer.
Disclosure of Invention
The technical concept of the invention is that a certain energy storage-hydrogen production hybrid system is configured at the thermal power side, and the layered deep peak regulation optimization is carried out, so that on one hand, the load of a thermal power plant is increased when new energy is generated greatly through energy storage and hydrogen production, the external output of a thermal power unit is reduced, and the deep peak regulation requirement of the dispatching side is adapted, on the other hand, the conversion of resource forms of hydrogen produced by hydrogen production is realized, the resource waste is reduced, and more profits can be realized by selling hydrogen, therefore, the problem of new energy consumption can be relieved more effectively, and the resource utilization efficiency is improved.
The invention aims to provide an energy regulation and control system and a regulation and control method for a thermal power plant containing an energy storage hydrogen production hybrid system.
The technical scheme adopted by the invention is as follows:
on one hand, the invention provides an energy regulation and control system of a thermal power plant containing an energy storage and hydrogen production hybrid system, which comprises a thermal power generating unit, an energy storage system, a hydrogen production system and a scheduling control system;
electric energy transmission channels are respectively arranged between the energy storage system, the hydrogen production system and the thermal power generating unit;
the scheduling control system receives external scheduling instruction information and obtains scheduling output target data in the external scheduling instruction information, and controls the operation of the thermal power generating unit, the energy storage system and/or the hydrogen production system according to the scheduling output target data so that the final output of the thermal power plant conforms to the scheduling output target data;
the final output of the thermal power plant is the output of the thermal power unit, or the residual output of the thermal power unit after the output of the thermal power unit is consumed by the energy storage system and/or the hydrogen production system, or the sum of the outputs of the thermal power unit and the energy storage system in the discharge state.
In the invention, if the scheduling output target data is smaller than a preset peak regulation reference value or larger than the maximum output of the unit, deep peak regulation is determined to be needed. The peak regulation reference value can refer to the relevant provisions of the peak regulation auxiliary service, for example, the peak regulation reference value is generally about 50%, that is, the ratio of the scheduled output target data to the full load power of the thermal power generating unit is less than 50%.
When deep peak shaving is needed and the dispatching output target data is larger than or equal to the minimum output of the thermal power generating unit, the method can adopt a conventional thermal power plant peak shaving method, namely a dispatching control system only controls the thermal power generating unit to reduce the output, so that the final output of the thermal power plant meets the dispatching output target data. Partial thermal power unit output can be consumed through the energy storage system and the hydrogen production system, so that the final output of the thermal power plant meets the dispatching output target data.
Optionally, the scheduling control system judges whether deep peak shaving is needed according to the scheduling output target data;
if deep peak shaving is needed and the scheduling output target data are smaller than the minimum output of the thermal power unit, calculating the output of the energy storage system and/or the hydrogen production system, which needs to be consumed, according to the difference value between the scheduling output target data and the minimum output of the thermal power unit, and further controlling the energy storage system and/or the hydrogen production system to operate under preset constraint according to the calculation result so as to consume the output of the thermal power unit, so that the final output of the thermal power plant meets the scheduling output target data;
and if deep peak shaving is needed and the dispatching output target data is larger than the maximum output of the thermal power generating unit, controlling the thermal power generating unit to operate at the maximum output and simultaneously controlling the energy storage system to operate in a discharging mode under the preset constraint. The energy storage system related constraints include energy storage system power constraints and capacity constraints.
Optionally, the preset constraint includes:
maximum and minimum power constraints for hydrogen production systems:
PH2_min＜PH2，t＜PH2_max(1)
in the formula, PH2,tFor instantaneous output of hydrogen production system, PH2_maxTo the maximum power, P, of the hydrogen production systemH2_minMinimum power for the hydrogen production system;
hydrogen storage tank capacity constraint of hydrogen production system:
0＜VH2,t＜VH2_max(2)
in the formula, VH2,tHydrogen capacity, V, stored for hydrogen production system at time tH2_maxThe maximum capacity of the hydrogen storage tank;
energy storage system power constraint:
in the formula, Pbess,tFor energy storage systemsInstantaneous power at time t, Pcharge_maxAnd Pdischarge_maxRespectively the maximum charge and discharge power, P, of the energy storage systemcharge_minAnd Pdischarge_minRespectively the minimum charge and discharge power of the energy storage system. The power conversion system of the general energy storage battery allows certain overload capacity, so that the instantaneous power can exceed the rated power of the energy storage battery;
and (4) capacity constraint of an energy storage system:
SOCmin≤SOCt≤SOCmax(4)
in the formula, SOCtFor the electric quantity and SOC of the energy storage system at the time tmaxFor maximum capacity, SOC, of the energy storage systemminThe energy storage system minimum capacity. To ensure efficient operation and extended service life of the energy storage system, a typical SOCminSet to 0.2 and above.
And under the condition that the energy storage system and the hydrogen production system meet related constraints, if the sum of the powers of the energy storage system charging and hydrogen production system is greater than the difference between the output target of the thermal power unit and the output minimum value of the thermal power unit, the scheduling control system can also control the thermal power unit to operate in a state higher than the minimum output according to the power margin of the energy storage system charging and hydrogen production system.
As an embodiment, the present invention sets the priority to charging the energy storage system first when controlling the operation of the energy storage system and the hydrogen production system, that is: when deep peak shaving is needed and the scheduling output target data are smaller than the minimum output value of the thermal power generating unit, the scheduling control system compares the difference value between the scheduling output target data and the minimum output value of the thermal power generating unit with the charging power of the energy storage system: if the difference is smaller than or equal to the charging power of the energy storage system, only controlling the energy storage system to perform charging operation so as to absorb the output of the thermal power generating unit corresponding to the difference; and if the difference is larger than the charging power of the energy storage system, controlling the energy storage system and the hydrogen production system to operate, so that the sum of the output of the thermal power generating unit consumed by the energy storage system and the hydrogen production system is equal to the difference.
Further, if the difference is larger than the power of the energy storage system, firstly controlling the energy storage system to charge and operate, and controlling the hydrogen production system to operate after the energy storage system is fully charged, so that the sum of the output of the thermal power generating unit consumed by the energy storage system and the hydrogen production system is equal to the difference.
In a second aspect, the present invention further provides a method for regulating and controlling an energy regulation and control system of a thermal power plant including the energy storage and hydrogen production hybrid system in the first aspect, including:
receiving a scheduling control instruction, and acquiring scheduling output target data of the thermal power plant from the scheduling control instruction;
judging whether deep peak shaving is needed according to dispatching output target data:
if deep peak shaving is needed and the dispatching output target data are smaller than the minimum output of the thermal power generating unit, calculating a difference value between the dispatching output target data and the minimum output of the thermal power generating unit, and comparing the difference value with the sum of the powers of the energy storage system and the hydrogen production system;
if the difference is larger than or equal to the sum of the powers of the energy storage system and the hydrogen production system, controlling the thermal power generating unit to operate at the minimum output, and controlling the energy storage system to charge and the hydrogen production system to operate at the maximum power;
if the difference is smaller than the sum of the powers of the energy storage system and the hydrogen production system but larger than the power of the energy storage system, controlling the thermal power generating unit to operate at the minimum output, simultaneously controlling the energy storage system to charge and operate, controlling the hydrogen production system to operate to meet the dispatching output target data, and controlling the hydrogen production system to operate only after the energy storage system is fully charged;
and if the difference is less than or equal to the power of the energy storage system, controlling the thermal power generating unit to operate at the minimum output, simultaneously controlling the energy storage system to operate in a charging mode, and only controlling the hydrogen production system to operate after the energy storage system is fully charged.
Optionally, if the scheduled output target data is smaller than a preset peak regulation reference value and is greater than or equal to the minimum output of the thermal power generating unit, controlling the thermal power generating unit to operate greater than or equal to the minimum output, and scheduling a difference value between the output target data and the output of the thermal power generating unit to be absorbed by the hydrogen production system; or simultaneously controlling the energy storage system to discharge and operate under the preset constraint, and supplying the discharged amount to the hydrogen production system;
if the dispatching output target data is larger than or equal to a preset peak regulation reference value and smaller than or equal to the maximum output of the thermal power generating unit: controlling the thermal power generating unit to operate to output according to the scheduling output target data, and simultaneously controlling the energy storage system to discharge and operate under the preset constraint, wherein the discharged amount is supplied to the hydrogen production system; or controlling the energy storage system to discharge and operate under preset constraint, and operating the thermal power unit to output according to the difference value of the scheduling output target data and the discharge power of the energy storage system until the energy storage system discharges, and only controlling the thermal power unit to operate and output according to the scheduling output target data.
Namely, under the deep peak regulation state or the non-deep peak regulation state, the invention can realize the allocation and utilization of resources in the thermal power plant through the energy storage system and the hydrogen production system, thereby not only improving the resource utilization rate, but also providing the auxiliary peak regulation service to a greater extent, and obtaining more subsidies except the auxiliary peak regulation through the prepared hydrogen.
Optionally, if the scheduled output target data is greater than the maximum output of the thermal power generating unit and the difference between the scheduled output target data and the maximum output of the thermal power generating unit is greater than the discharge power of the energy storage system, controlling the thermal power generating unit to operate according to the maximum output, and controlling the energy storage system to operate in a discharge mode according to the power difference between the thermal power generating unit and the scheduled output target data under preset constraint; stopping discharging until the energy storage system finishes discharging, and feeding back the requirement of the scheduling mechanism to reduce the scheduling output;
if the dispatching output target data is larger than the maximum output of the thermal power generating unit and the difference value of the dispatching output target data and the maximum output of the thermal power generating unit is smaller than or equal to the discharge power of the energy storage system, judging whether the difference value is larger than the preset limit discharge power of the energy storage system: if so, controlling the thermal power generating unit to operate according to the maximum output, and enabling the energy storage system to operate in a discharge mode between the rated power and the preset limit discharge power until the discharge is finished; and if not, controlling the thermal power generating unit to operate according to the maximum output, and enabling the energy storage system to operate in a discharging mode according to the preset limit discharging power until discharging is finished. Under the condition that energy storage discharge can supplement and dispatch output, when the energy storage system finishes discharging, the dispatching mechanism needs to be fed back to reduce the output, and if the energy storage discharge still cannot supplement and dispatch the output, the dispatching mechanism needs to be fed back in time to reduce the dispatching output.
Advantageous effects
According to the invention, the energy storage-hydrogen production hybrid system is configured in the thermal power plant and is combined with the thermal power unit to output power, so that the external output of the thermal power unit can be reduced by increasing the load of the thermal power plant when new energy is generated greatly, the scheduling requirement is met, meanwhile, deep peak regulation subsidies are obtained, the effective consumption of internal power resources of the thermal power plant can be realized by producing and selling hydrogen, and more profits are generated. When the power is tight, the invention can compensate the insufficient output of the thermal power unit through the energy storage system. Therefore, the method and the device can effectively relieve the problem of new energy consumption, improve the utilization efficiency of resources, provide an auxiliary peak shaving service with deeper level and larger dispatching output range, and ensure the economic benefit of the thermal power plant.
Drawings
FIG. 1 is a schematic diagram of the energy storage-hydrogen production hybrid system of the present invention;
FIG. 2 is a schematic diagram of a regulation strategy of the energy storage-hydrogen production hybrid system for participating in peak shaving when new energy is in heavy load;
fig. 3 is a schematic diagram of a regulation strategy of the energy storage-hydrogen production hybrid system participating in peak shaving in summer power tightening.
Detailed Description
The following further description is made in conjunction with the accompanying drawings and the specific embodiments.
Example 1
In this embodiment, an energy regulation and control system of a thermal power plant including an energy storage and hydrogen production hybrid system is described, and referring to fig. 1, the system includes a thermal power generating unit, an energy storage system, a hydrogen production system, and a scheduling control system;
electric energy transmission channels are respectively arranged between the energy storage system, the hydrogen production system and the thermal power generating unit;
the scheduling control system receives external scheduling instruction information and obtains scheduling output target data in the external scheduling instruction information, and controls the operation of the thermal power generating unit, the energy storage system and/or the hydrogen production system according to the scheduling output target data so that the final output of the thermal power plant conforms to the scheduling output target data;
the final output of the thermal power plant is the output of the thermal power unit, or the residual output of the thermal power unit after the output of the thermal power unit is consumed by the energy storage system and/or the hydrogen production system, or the sum of the outputs of the thermal power unit and the energy storage system in the discharge state.
The energy storage system and the hydrogen production system in the hybrid system realize joint output to participate in auxiliary peak regulation service with the thermal power generating unit. The energy storage system mainly comprises a lithium iron phosphate energy storage battery, a power conversion system, a step-up transformer and the like, and belongs to the prior art. The hydrogen production system mainly comprises a water electrolysis hydrogen production system, a power conversion system and a step-up transformer, and also belongs to the prior art. The hydrogen produced by the hydrogen production system is stored in a hydrogen storage tank and can be transported to a hydrogen filling station, a factory and the like for use, and certain benefits are obtained by selling the hydrogen.
In the invention, if the scheduling output target data is smaller than a preset peak regulation reference value or larger than the maximum output of the unit, deep peak regulation is determined to be needed. The peak regulation reference value can refer to the relevant provisions of the peak regulation auxiliary service, for example, the peak regulation reference value is generally about 50%, that is, the ratio of the scheduled output target data to the full load power of the thermal power generating unit is less than 50%.
When deep peak shaving is needed and the dispatching output target data is larger than or equal to the minimum output of the thermal power generating unit, the method can adopt a conventional thermal power plant peak shaving method, namely a dispatching control system only controls the thermal power generating unit to reduce the output, so that the final output of the thermal power plant meets the dispatching output target data. Partial thermal power unit output can be consumed through the energy storage system and the hydrogen production system, so that the final output of the thermal power plant meets the dispatching output target data.
Examples 1 to 1
Based on embodiment 1, in combination with fig. 2 and fig. 3, in this embodiment, the scheduling control system determines whether deep peak shaving is required according to the scheduling output target data;
if deep peak shaving is needed and the scheduling output target data are smaller than the minimum output of the thermal power unit, calculating the output of the energy storage system and/or the hydrogen production system, which needs to be consumed, according to the difference value between the scheduling output target data and the minimum output of the thermal power unit, and further controlling the energy storage system and/or the hydrogen production system to operate under preset constraint according to the calculation result so as to consume the output of the thermal power unit, so that the final output of the thermal power plant meets the scheduling output target data;
and if deep peak shaving is needed and the dispatching output target data is larger than the maximum output of the thermal power generating unit, controlling the thermal power generating unit to operate at the maximum output and simultaneously controlling the energy storage system to operate in a discharging mode under the preset constraint. The energy storage system related constraints include energy storage system power constraints and capacity constraints.
The preset constraints include:
maximum and minimum power constraints for hydrogen production systems:
PH2_min＜PH2，t＜PH2_max(1)
in the formula, PH2,tFor instantaneous output of hydrogen production system, PH2_maxTo the maximum power, P, of the hydrogen production systemH2_minMinimum power for the hydrogen production system;
hydrogen storage tank capacity constraint of hydrogen production system:
0＜VH2,t＜VH2_max(2)
in the formula, VH2,tHydrogen capacity, V, stored for hydrogen production system at time tH2_maxThe maximum capacity of the hydrogen storage tank;
energy storage system power constraint:
in the formula, Pbess,tFor instantaneous power of the energy storage system at time t, Pcharge_maxAnd Pdischarge_maxRespectively the maximum charge and discharge power, P, of the energy storage systemcharge_minAnd Pdischarge_minRespectively the minimum charge and discharge power of the energy storage system. The power conversion system of the general energy storage battery allows certain overload capacity, so that the instantaneous power can exceed the rated power of the energy storage battery;
and (4) capacity constraint of an energy storage system:
SOCmin≤SOCt≤SOCmax(4)
in the formula, SOCtFor the electric quantity and SOC of the energy storage system at the time tmaxFor maximum capacity, SOC, of the energy storage systemminThe energy storage system minimum capacity. To ensure efficient operation and extended service life of the energy storage system, a typical SOCminSet to 0.2 and above.
And under the condition that the energy storage system and the hydrogen production system meet related constraints, if the sum of the powers of the energy storage system charging and hydrogen production system is greater than the difference between the output target of the thermal power unit and the output minimum value of the thermal power unit, the scheduling control system can also control the thermal power unit to operate in a state higher than the minimum output according to the power margin of the energy storage system charging and hydrogen production system.
The technical idea of the invention is to consume the surplus new energy electric quantity exceeding the power grid accepting capability through the energy storage and hydrogen production system. Considering that the electricity consumption cost of each system and the frequent starting of the hydrogen production system have certain influence on the electrolytic cell, the fire electricity generator set, the energy storage system and the hydrogen production system act in sequence in the deep peak shaving process, the energy storage system and the hydrogen production system are started preferentially and mainly bear frequent fluctuation power in unbalanced power, and the hydrogen production system bears basic power in a power difference value, so that the service life of the electrolytic cell is prolonged.
Therefore, in this embodiment, when the energy storage system and the hydrogen production system are controlled to operate, the priority is set to be the charging priority of the energy storage system, that is: when deep peak shaving is needed and the scheduling output target data are smaller than the minimum output value of the thermal power generating unit, the scheduling control system compares the difference value between the scheduling output target data and the minimum output value of the thermal power generating unit with the charging power of the energy storage system: if the difference is smaller than or equal to the charging power of the energy storage system, only controlling the energy storage system to perform charging operation so as to absorb the output of the thermal power generating unit corresponding to the difference; and if the difference is larger than the charging power of the energy storage system, controlling the energy storage system and the hydrogen production system to operate, so that the sum of the output of the thermal power generating unit consumed by the energy storage system and the hydrogen production system is equal to the difference.
Under the thought of priority of charging of the energy storage system, if the difference is larger than the power of the energy storage system, firstly controlling the energy storage system to operate in a charging mode, and controlling the hydrogen production system to operate after the energy storage system is fully charged, so that the sum of the output of the thermal power generating unit consumed by the energy storage system and the hydrogen production system is equal to the difference.
Example 2
This example describes a method for regulating an energy regulation and control system of a thermal power plant including an energy storage hydrogen production hybrid system based on the systems of examples 1 and 1 to 1, including:
receiving a scheduling control instruction, and acquiring scheduling output target data of the thermal power plant from the scheduling control instruction;
judging whether deep peak shaving is needed according to dispatching output target data:
if deep peak shaving is needed and the dispatching output target data are smaller than the minimum output of the thermal power generating unit, calculating a difference value between the dispatching output target data and the minimum output of the thermal power generating unit, and comparing the difference value with the sum of the powers of the energy storage system and the hydrogen production system;
if the difference is larger than or equal to the sum of the powers of the energy storage system and the hydrogen production system, controlling the thermal power generating unit to operate at the minimum output, and controlling the energy storage system to charge and the hydrogen production system to operate at the maximum power;
if the difference is smaller than the sum of the powers of the energy storage system and the hydrogen production system but larger than the power of the energy storage system, controlling the thermal power generating unit to operate at the minimum output, simultaneously controlling the energy storage system to charge and operate, controlling the hydrogen production system to operate to meet the dispatching output target data, and controlling the hydrogen production system to operate only after the energy storage system is fully charged;
and if the difference is less than or equal to the power of the energy storage system, controlling the thermal power generating unit to operate at the minimum output, simultaneously controlling the energy storage system to operate in a charging mode, and only controlling the hydrogen production system to operate after the energy storage system is fully charged.
The dispatching control command is a command which is sent by the dispatching mechanism and contains dispatching output target data.
Example 2-1
The present embodiment specifically describes the control method with reference to fig. 2 and 3. For the purposes of the aspect description, the relevant parameters are specifically defined as: pbessPower of the energy storage system, PH2Hydrogen production system power, PtheScheduling authority required scheduling contribution target, PprPeak shaving reference value, Pmax-fireThe maximum output of the generator set is generally rated power, k is the ratio of the basic peak regulation capacity of thermal power to the maximum output, so that (1-k) P can be usedmaxThe minimum output of the thermal power unit and the maximum output P of the thermal power unit are representedmaxTypically at rated power.
Referring to FIG. 3, if the output target data P is scheduledtheLess than a preset peak regulation reference value PprAnd is greater than or equal to the minimum output (1-k) P of the thermal power generating unitmaxControlling the thermal power generating unit to operate more than or equal to the minimum output, and scheduling the difference (1-k) P between the output target data and the output of the thermal power generating unitmax-PtheThe discharged amount is supplied to the hydrogen production system through consumption of the hydrogen production system or simultaneous control of discharge operation of the energy storage system under preset constraint;
referring to FIG. 3, if the output target data P is scheduledtheGreater than or equal to a preset peak regulation reference value PprAnd is less than or equal to the maximum output P of the thermal power generating unitmax: controlling the thermal power generating unit to output target data P according to the dispatchingtheOperating output, or simultaneously controlling the energy storage system to discharge and operate under preset constraint, and supplying the discharged amount to the hydrogen production system; or controlling the energy storage system to discharge and operate under preset constraint, and operating the thermal power unit to output according to the difference value of the scheduling output target data and the discharge power of the energy storage system until the energy storage system discharges, and only controlling the thermal power unit to operate and output according to the scheduling output target data.
Referring to fig. 3, if the scheduling output target data is greater than the maximum output P of the unitthe＞PmaxAnd the difference P between the twothe-PmaxGreater than the discharge power P of the energy storage systembessControlling the thermal power generating unit to output P according to the maximum outputmaxWhen the energy storage system is operated, the energy storage system is under the preset constraint according to the power difference value P between the thermal power generating unit and the dispatching output target datathe-PmaxDischarging operation; stopping discharging until the energy storage system finishes discharging, and feeding back the requirement of the scheduling mechanism to reduce the scheduling output;
referring to fig. 3, if the scheduling output target data is greater than the maximum output P of the thermal power generating unitthe＞PmaxAnd both of themThe difference is less than or equal to the discharge power P of the energy storage systemthe-Pmax≤PbessJudging whether the difference value is greater than the preset limit discharge power of the energy storage system: if so, controlling the thermal power generating unit to operate according to the maximum output, and enabling the energy storage system to operate in a discharge mode between the rated power and the preset limit discharge power until the discharge is finished; and if not, controlling the thermal power generating unit to operate according to the maximum output, and enabling the energy storage system to operate in a discharging mode according to the preset limit discharging power until discharging is finished. Under the condition that energy storage discharge can supplement and dispatch output, when the energy storage system finishes discharging, the dispatching mechanism needs to be fed back to reduce the output, and if the energy storage discharge still cannot supplement and dispatch the output, the dispatching mechanism needs to be fed back in time to reduce the dispatching output. The preset limit discharge power may be set to 1.5Pbess。
Examples 2 to 2
This embodiment specifically describes an implementation manner based on embodiment 2:
the energy management hierarchical optimization strategy, namely the strategy of the regulation and control method, of the embodiment is as follows: when participating in auxiliary peak shaving, if the output of the thermal power generating unit scheduled by the scheduling mechanism is larger than a peak shaving reference value specified by the auxiliary peak shaving market rule of the unit, the thermal power generating unit needs to bear peak shaving obligations in a non-paid manner, and the scheduling mechanism calls in a non-paid manner; if the thermal power unit output is scheduled by the scheduling mechanism to be in the interval of the lowest output and the peak regulation reference value, the thermal power unit can carry out peak regulation, and a hybrid system is not required to participate in peak regulation; if the dispatching of the dispatching mechanism is lower than the minimum output of the thermal power unit, the thermal power unit outputs with the minimum power at the moment, the output of the dispatching requirement cannot be met, the energy storage-hydrogen production hybrid system serves as a load to reduce the output of the thermal power unit, the energy storage system absorbs electric quantity, the hydrogen production system starts to produce hydrogen, the thermal power unit obtains deep peak regulation compensation, and meanwhile the rest part for improving the new energy consumption capacity is complemented by the hybrid system.
Relevant constraints to be satisfied in regulation include:
maximum and minimum power constraints for hydrogen production systems:
PH2_min＜PH2，t＜PH2_max(1)
in the formula, PH2,tFor instantaneous output of hydrogen production system, PH2_maxTo the maximum power, P, of the hydrogen production systemH2_minMinimum power for the hydrogen production system;
hydrogen storage tank capacity constraint of hydrogen production system:
0＜VH2,t＜VH2_max(2)
in the formula, VH2,tHydrogen capacity, V, stored for hydrogen production system at time tH2_maxThe maximum capacity of the hydrogen storage tank;
energy storage system power constraint:
in the formula, Pbess,tFor instantaneous power of the energy storage system at time t, Pcharge_maxAnd Pdischarge_maxRespectively the maximum charge and discharge power, P, of the energy storage systemcharge_minAnd Pdischarge_minRespectively the minimum charge and discharge power of the energy storage system. The power conversion system of the general energy storage battery allows certain overload capacity, so that the instantaneous power can exceed the rated power of the energy storage battery;
and (4) capacity constraint of an energy storage system:
SOCmin≤SOCt≤SOCmax(4)
in the formula, SOCtFor the electric quantity and SOC of the energy storage system at the time tmaxFor maximum capacity, SOC, of the energy storage systemminThe energy storage system minimum capacity. To ensure efficient operation and extended service life of the energy storage system, a typical SOCminSet to 0.2 and above.
According to different auxiliary peak shaving conditions, when new energy is generated greatly, the energy management strategies of the thermal power plant have 5 conditions in total, namely state control SC 1-SC 5, and refer to FIG. 2; in the case of a high load of the power system in summer, the thermal power plant may need rain energy storage to cooperatively output power, and the energy management strategy has 4 cases, namely, state control SC6 to SC9, referring to fig. 3.
The energy regulation and control strategy for assisting peak regulation during the heavy emergence of new energy specifically comprises the following steps:
state control SC 1: at the moment, the thermal power unit enters a deep peak regulation state to output the lowest output, and meanwhile, the energy storage system and the hydrogen production system absorb the thermal power output at rated power, but the power generated by the hybrid system combined with the thermal power unit is still high, so that the dispatching power is difficult to achieve. According to the existing energy storage system PCS equipment condition and hydrogen production system equipment condition, the energy storage system and the hydrogen production system can absorb thermal power output in a short time by 1.5 times of rated power, and if the output requirement cannot be met, the feedback scheduling mechanism requires to increase the scheduling output.
State control SC 2: at the moment, the thermal power generating unit enters a deep peak regulation state to output the lowest output, the energy storage system in the hybrid system preferentially acts, the rest part is used for producing hydrogen by the hydrogen production system to achieve the dispatching power, and the hydrogen production power is as follows: (1-k) Pmax-Pthe-PbessIf the electric quantity of the energy storage system reaches the upper limit, the energy storage system stops acting, the hydrogen production system acts to complement the power, and if the output requirement cannot be met, the feedback scheduling mechanism requests to increase the scheduling output.
State control SC 3: at the moment, the thermal power generating unit enters a deep peak shaving state to output the lowest output, only the energy storage system in the hybrid system acts, if the electric quantity of the energy storage system reaches the upper limit, the energy storage system stops acting, and the hydrogen production system acts to supplement the power.
State control SC 4: at the moment, the thermal power generating unit enters a deep peak regulation state, the thermal power generating unit can reach the output required by the dispatching mechanism without reducing to the minimum output, the energy storage system can discharge to supply the hydrogen production system for hydrogen production, and if the SOC of the energy storage system is smaller than the minimum allowable value (generally 0.2) of electric quantity, the hydrogen supply is stopped.
State control SC 5: at the moment, the output of the thermal power generating unit is higher than a thermal power scheduling reference value, and a scheduling mechanism performs non-compensation scheduling without peak regulation subsidy. The energy storage system in the hybrid system can discharge to supply hydrogen for the hydrogen production system to produce hydrogen, and if the SOC of the energy storage system is smaller than an allowable value, the hydrogen supply is stopped.
The specific system control steps when the new energy is in a big accident are shown in figure 2:
step 0: debugging an energy storage-hydrogen production mixing system;
step 0-1: judging the states of an energy storage system and hydrogen production equipment in the energy storage-hydrogen production hybrid system, if the states are good, entering the step 0-2, and if the states are failed, returning to the step 0;
step 0-2: an energy storage system and hydrogen production equipment are reserved;
step 1: according to the conditions of the output and the load of the new energy, the output target of the thermal power plant is scheduled to be P in a scheduling instruction sent by a scheduling mechanismtheJudgment of PtheWhether the peak load is larger than the thermal power peak regulation reference value PprIf P isthe＜PprEntering a deep peak regulation state in the step 2, if P isthe≥PprThen state control SC5 is entered;
step 2: judgment of PtheWhether the minimum output force is greater than the minimum output force (1-k) P of the thermal power generating unitmaxIf P isthe＜(1-k)PmaxGo to step 3 if Pthe≥(1-k)PmaxThen state control SC4 is entered;
and step 3: judging hybrid system power Pbess+PH2Whether the output of the thermal power plant is greater than PtheMinimum output (1-k) P of thermal power generating unitmaxA difference of (P) ifbess+PH2)＞[(1-k)Pmax-Pthe]Go to step 4 if (P)bess+PH2)≤[(1-k)Pmax-Pthe]Then state control SC1 is entered;
and 4, step 4: judging the power P of the energy storage systembessWhether the output of the thermal power plant is less than PtheMinimum output (1-k) P of thermal power generating unitmaxIf P is a difference ofbess＜[(1-k)Pmax-Pthe]Then enter state control SC2 if Pbess≥[(1-k)Pmax-Pthe]Then state control SC3 is entered;
and 5: and (4) judging whether the hybrid system meets corresponding constraint conditions, if so, entering the next peak shaving interval, and if not, returning to the step 1.
The system regulation and control strategy of the auxiliary peak regulation when the electric power is tight specifically comprises the following steps:
state control SC 6: the energy storage system is short-time over-output at 1.5 times of rated power, the thermal power unit is output at the rated power, and even if the energy storage system discharges to the minimum capacity or still cannot meet the dispatching output requirement, the dispatching output is reduced by feeding back the requirement of a dispatching mechanism;
state control SC 7: short-term output of energy storage system is Pbess～1.5PbessMeanwhile, the thermal power generating unit outputs at rated power to achieve scheduling output PtheIf the electric quantity of the energy storage system is discharged to the minimum capacity, the discharge is stopped, and the feedback scheduling mechanism requires to reduce the scheduling output;
state control SC 8: the thermal power generating unit outputs power at rated power, and the output of the energy storage system is Pthe-PmaxTo achieve a scheduling output PtheIf the energy storage system is completely discharged, the energy storage system stops discharging, and the feedback scheduling mechanism requires to reduce the scheduling output;
state control SC 9: thermal power generating unit using Pthe-PbessAnd (4) outputting power, discharging the energy storage system, and waiting for the next time of scheduling.
The method comprises the following specific steps:
step 0: debugging an energy storage-hydrogen production mixing system;
step 0-1: judging the state of an energy storage system in the energy storage-hydrogen production hybrid system, if the state is good, entering the step 0-2, and if the state is failed, returning to the step 0;
step 0-2: the energy storage system is standby;
step 1: according to the new energy output and load conditions, the dispatching mechanism dispatches the output of the thermal power plant to be PtheJudgment of PtheWhether or not greater than PmaxIf the value is less than or equal to the preset value, entering SC9, and if the value is greater than the preset value, entering step 2;
step 2: judgment of Pbess＜(Pthe-Pmax) If yes, entering SC8, otherwise entering step 3;
and step 3: judgment of 1.5Pbess＜(Pthe-Pmax) If yes, the operation proceeds to SC7, and if not, the operation proceeds to SC 6.
And 4, step 4: and (3) judging whether the hybrid system meets the constraint conditions (3) and (4) of the energy storage system, if so, entering the next peak shaving interval, and if not, returning to the step (1).
Namely, under the deep peak regulation state or the non-deep peak regulation state, the invention can realize the allocation and utilization of resources in the thermal power plant through the energy storage system and the hydrogen production system, thereby not only improving the resource utilization rate, but also providing the auxiliary peak regulation service to a greater extent, and obtaining more subsidies except the auxiliary peak regulation through the prepared hydrogen.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A thermal power plant energy regulation and control system containing an energy storage and hydrogen production hybrid system is characterized by comprising a thermal power unit, an energy storage system, a hydrogen production system and a scheduling control system;
electric energy transmission channels are respectively arranged between the energy storage system, the hydrogen production system and the thermal power generating unit;
the scheduling control system receives external scheduling instruction information and obtains scheduling output target data in the external scheduling instruction information, and controls the operation of the thermal power generating unit, the energy storage system and/or the hydrogen production system according to the scheduling output target data so that the final output of the thermal power plant conforms to the scheduling output target data;
the final output of the thermal power plant is the output of the thermal power unit, or the residual output of the thermal power unit after the output of the thermal power unit is consumed by the energy storage system and/or the hydrogen production system, or the sum of the outputs of the thermal power unit and the energy storage system in the discharge state.
2. The thermal power plant energy regulation and control system of the energy storage and hydrogen production hybrid system according to claim 1, wherein the scheduling control system determines whether deep peak shaving is required according to the scheduling output target data;
if deep peak shaving is needed and the scheduling output target data are smaller than the minimum output of the thermal power unit, calculating the output of the energy storage system and/or the hydrogen production system, which needs to be consumed, according to the difference value between the scheduling output target data and the minimum output of the thermal power unit, and further controlling the energy storage system and/or the hydrogen production system to operate under preset constraint according to the calculation result so as to consume the output of the thermal power unit, so that the final output of the thermal power plant meets the scheduling output target data;
and if deep peak shaving is needed and the dispatching output target data is larger than the maximum output of the thermal power generating unit, controlling the thermal power generating unit to operate at the maximum output and simultaneously controlling the energy storage system to operate in a discharging mode under the preset constraint.
3. A thermal power plant energy conditioning system including an energy storage and hydrogen production hybrid system as claimed in claim 2, wherein the predetermined constraints include:
maximum and minimum power constraints for hydrogen production systems:
PH2_min＜PH2，t＜PH2_max(1)
in the formula, PH2,tFor instantaneous output of hydrogen production system, PH2_maxTo the maximum power, P, of the hydrogen production systemH2_minMinimum power for the hydrogen production system;
hydrogen storage tank capacity constraint of hydrogen production system:
0＜VH2,t＜VH2_max(2)
in the formula, VH2,tHydrogen capacity, V, stored for hydrogen production system at time tH2_maxThe maximum capacity of the hydrogen storage tank;
energy storage system power constraint:
in the formula, Pbess,tFor instantaneous power of the energy storage system at time t, Pcharge_maxAnd Pdischarge_maxRespectively the maximum charge and discharge power, P, of the energy storage systemcharge_minAnd Pdischarge_minRespectively is the minimum charge and discharge power of the energy storage system;
and (4) capacity constraint of an energy storage system:
SOCmin≤SOCt≤SOCmax(4)
in the formula, SOCtFor the electric quantity and SOC of the energy storage system at the time tmaxFor maximum capacity, SOC, of the energy storage systemminThe energy storage system minimum capacity.
4. The thermal power plant energy regulation and control system of the energy storage and hydrogen production hybrid system according to claim 2, wherein when deep peak shaving is required and the scheduling output target data is smaller than the thermal power unit output minimum value, the scheduling control system compares the difference between the scheduling output target data and the thermal power unit output minimum value with the energy storage system charging power: if the difference is smaller than or equal to the charging power of the energy storage system, only controlling the energy storage system to perform charging operation so as to absorb the output of the thermal power generating unit corresponding to the difference; and if the difference is larger than the charging power of the energy storage system, controlling the energy storage system and the hydrogen production system to operate, so that the sum of the output of the thermal power generating unit consumed by the energy storage system and the hydrogen production system is equal to the difference.
5. The thermal power plant energy regulating and controlling system comprising the energy storage and hydrogen production hybrid system according to claim 4, wherein if the difference is larger than the power of the energy storage system, the energy storage system is controlled to be charged to operate firstly, and the hydrogen production system is controlled to operate after the energy storage system is fully charged, so that the sum of the output of the thermal power generating unit consumed by the energy storage system and the hydrogen production system is equal to the difference.
6. A method for regulating and controlling an energy regulating and controlling system of a thermal power plant comprising an energy storage and hydrogen production hybrid system according to any one of claims 1 to 5, which comprises the following steps:
receiving a scheduling control instruction, and acquiring scheduling output target data of the thermal power plant from the scheduling control instruction;
judging whether deep peak shaving is needed according to dispatching output target data:
if deep peak shaving is needed and the dispatching output target data are smaller than the minimum output of the thermal power generating unit, calculating a difference value between the dispatching output target data and the minimum output of the thermal power generating unit, and comparing the difference value with the sum of the powers of the energy storage system and the hydrogen production system;
if the difference is larger than or equal to the sum of the powers of the energy storage system and the hydrogen production system, controlling the thermal power generating unit to operate at the minimum output, and controlling the energy storage system to charge and the hydrogen production system to operate at the maximum power;
if the difference is smaller than the sum of the powers of the energy storage system and the hydrogen production system but larger than the power of the energy storage system, controlling the thermal power generating unit to operate at the minimum output, simultaneously controlling the energy storage system to charge and operate, controlling the hydrogen production system to operate to meet the dispatching output target data, and controlling the hydrogen production system to operate only after the energy storage system is fully charged;
and if the difference is less than or equal to the power of the energy storage system, controlling the thermal power generating unit to operate at the minimum output, simultaneously controlling the energy storage system to operate in a charging mode, and only controlling the hydrogen production system to operate after the energy storage system is fully charged.
7. The method as claimed in claim 6, wherein if the scheduled output target data is less than the preset peak shaving reference value and greater than or equal to the minimum output of the thermal power generating unit, the thermal power generating unit is controlled to operate at or equal to the minimum output, and the difference between the scheduled output target data and the output of the thermal power generating unit is absorbed by the hydrogen production system; or simultaneously controlling the energy storage system to discharge and operate under the preset constraint, and supplying the discharged amount to the hydrogen production system;
if the dispatching output target data is larger than or equal to a preset peak regulation reference value and smaller than or equal to the maximum output of the thermal power generating unit: controlling the thermal power generating unit to operate to output according to the scheduling output target data, or simultaneously controlling the energy storage system to discharge and operate under preset constraint, and supplying the discharged amount to the hydrogen production system; or controlling the energy storage system to discharge and operate under preset constraint, and operating the thermal power unit to output according to the difference value of the scheduling output target data and the discharge power of the energy storage system until the energy storage system discharges, and only controlling the thermal power unit to operate and output according to the scheduling output target data.
8. The method as claimed in claim 6 or 7, wherein if the scheduled output target data is greater than the maximum output of the thermal power generating unit and the difference between the scheduled output target data and the maximum output of the thermal power generating unit is greater than the discharge power of the energy storage system, the thermal power generating unit is controlled to operate according to the maximum output, and the energy storage system operates under the preset constraint by discharging according to the power difference between the thermal power generating unit and the scheduled output target data;
if the dispatching output target data is larger than the maximum output of the thermal power generating unit and the difference value of the dispatching output target data and the maximum output of the thermal power generating unit is smaller than or equal to the discharge power of the energy storage system, judging whether the difference value is larger than the preset limit discharge power of the energy storage system: if so, controlling the thermal power generating unit to operate according to the maximum output, and enabling the energy storage system to operate in a discharge mode between the rated power and the preset limit discharge power until the discharge is finished; and if not, controlling the thermal power generating unit to operate according to the maximum output, and enabling the energy storage system to operate in a discharging mode according to the preset limit discharging power until discharging is finished.
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