CN111262263A - Unit adjusting strategy based on residual electric quantity of energy storage battery - Google Patents
Unit adjusting strategy based on residual electric quantity of energy storage battery Download PDFInfo
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- CN111262263A CN111262263A CN202010165141.4A CN202010165141A CN111262263A CN 111262263 A CN111262263 A CN 111262263A CN 202010165141 A CN202010165141 A CN 202010165141A CN 111262263 A CN111262263 A CN 111262263A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
Abstract
The utility model provides a unit regulation strategy based on energy storage battery residual capacity, belongs to electric wire netting operation and maintenance technical field, in time adjusts the unit control strategy according to energy storage battery residual capacity SOC, secondary frequency modulation AGC instruction, primary frequency modulation instruction, unit load etc. satisfies primary frequency modulation and secondary frequency modulation performance, optimizes existing control algorithm, reduces the undulant amplitude of frequency, accelerates the recovery of frequency, can also effectively maintain energy storage self SOC simultaneously, avoids the energy storage to cause unfavorable disturbance to the system when SOC transfinites. The service life of the battery is prolonged and the benefit is improved as much as possible. On the basis of the existing algorithm for mutually independent control of the unit and the energy storage system, the control strategy of the unit and the energy storage is combined by considering the control rule of SOC feedback, the KP value is improved, and the service life of the battery is prolonged.
Description
Technical Field
The invention belongs to the technical field of power grid operation and maintenance, and particularly relates to a unit adjusting strategy based on the residual electric quantity SOC of an energy storage battery.
Background
With the increase of the power generation permeability of the clean energy, the development of an energy storage technology and the construction of an energy storage project become key methods for solving the intermittent defect of the clean energy and ensuring the safe operation of a power grid. The 'guidance opinions about promotion of energy storage technology and industry development in China', published in 2017, 10, 11, points out the problems of insufficient policy support, insufficient research and development scope, insufficient technical standard, insufficient overall planning and the like in the energy storage technology and industry development in the present stage of China as the first guidance policy of the energy storage industry in China, and provides the development targets and key tasks of the energy storage technology and industry in China in the coming decade.
Therefore, the stored energy is about to become the main trend of the power plant for rapidly responding to the load change of the power grid. However, in the existing energy storage project process, the energy storage control system is usually provided by a battery manufacturer, the functionality is single, the stability is unknown, the common cooperation condition of the original unit and the energy storage system is not considered, the existing technology is similar to mutual independence according to the energy storage side and the unit side, the coordination controllability is not strong, the energy storage side control strategy is direct, the consideration on the service life of the battery is less, the unit side does not make corresponding changes before and after the operation of the energy storage battery, and the cooperation with the energy storage side is less.
The known energy storage frequency modulation strategy is that a battery and a unit respond simultaneously according to a secondary frequency modulation AGC command issued by scheduling, the generating power of the known energy storage frequency modulation strategy is the difference between the secondary frequency modulation AGC command and the actual load of the unit, and the unit side is the same as that of the unit side without chemical energy storage. When the residual electric quantity SOC of the battery is too low, if the secondary frequency modulation AGC instruction is increased, the battery needs to give up the response, the unit independently responds until the secondary frequency modulation AGC instruction is reduced, and the unit can charge the battery; similarly, when the remaining battery capacity SOC is too high, if the AGC command is lowered, the battery must give up the response, and the unit independently responds until the secondary frequency modulation AGC command is increased, and the battery can be used to perform discharging to satisfy the response. The analysis shows that the response of the battery to the secondary frequency modulation AGC instruction can be abandoned for many times during operation, the essential significance of energy storage frequency modulation is lost, and the economic benefit is lost. Therefore, a new technical solution is needed to solve this problem.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: providing a unit adjusting strategy based on the remaining power of an energy storage battery, timely adjusting a unit side control strategy according to the state of the remaining power SOC of the battery, and finally keeping the remaining power SOC of the battery at about a middle value without purely relying on the action of an energy storage side; the advantages of high response speed of energy storage frequency modulation of the battery and the like are fully exerted, and the actions are performed as far as possible for AGC (automatic gain control) and primary frequency modulation of each secondary frequency modulation; the loss of the battery is reduced, and the service life of the battery is prolonged; the secondary frequency modulation AGC and the primary frequency modulation action instruction can be actively responded each time, and certain economic benefit is brought to the power plant.
A unit adjusting strategy based on the residual electric quantity of an energy storage battery is characterized in that: comprises the following steps of (a) carrying out,
the method comprises the following steps that firstly, an energy storage system of the power grid thermal power generating unit is put into operation, a secondary frequency modulation AGC instruction is judged, the secondary frequency modulation AGC instruction is increased, a battery of the energy storage system discharges to a power grid, the energy storage system logically judges the SOC value of the residual electric quantity of the battery, the SOC value is lower than 30%, and the unit adopts a control strategy as follows:
increasing secondary frequency modulation AGC instruction offset according to the main steam pressure of the unit, the actual load of the unit and the size of a secondary frequency modulation AGC instruction until the actual load value of the unit is higher than 90%, and stopping the secondary frequency modulation AGC instruction offset;
after the real load of the unit returns to the initial secondary frequency modulation AGC instruction value, the unit continues to increase the load, the control strategy of the energy storage side is unchanged, and the battery is converted into a charging state from discharging;
charging the residual battery SOC to 45% -55%, adjusting the control strategy again by the unit, reducing the bias of the secondary frequency modulation AGC instruction to the original value, reducing the load of the unit to the original secondary frequency modulation AGC instruction value, and completing a response period after the unit is in a stable state;
step two, judging that the secondary frequency modulation AGC instruction is descending, charging the battery of the energy storage system from the power grid, logically judging the residual electric quantity SOC of the battery by the energy storage system, wherein the SOC is higher than 70%, and adopting a control strategy of a unit as follows:
adjusting the bias of a secondary frequency modulation AGC instruction according to the main steam pressure of the unit, the actual load of the unit and the size of the secondary frequency modulation AGC instruction, wherein if the actual load value of the unit is greater than 10% of the rated load above the lowest stable combustion load at the moment, the bias of the secondary frequency modulation AGC instruction is not increased; if the real load of the unit meets the control strategy condition, increasing the bias of a secondary frequency modulation AGC instruction until the target load instruction is lower than the original secondary frequency modulation AGC instruction;
after the actual load of the unit reaches the original secondary frequency modulation AGC instruction value, the unit continues to reduce the load, the energy storage side keeps the original control strategy, and the battery is converted into a discharge state from charging;
and charging the residual battery SOC to 5% -55%, adjusting the control strategy again by the unit, restoring the bias of the secondary frequency modulation AGC instruction to the original value, increasing the load of the unit to the original secondary frequency modulation AGC instruction value, and completing a response period after the unit is in a stable state.
After a response period is completed in the first step and the second step, the set does not reach the primary steady state, the secondary frequency modulation AGC instruction changes again, the change direction is the same as the last time, and the set operates according to the original control strategy; the change direction of the secondary frequency modulation AGC instruction is opposite to the last time, and the energy storage system directly charges the battery.
And in the operation process of the energy storage system of the power grid thermal power generating unit, the main steam pressure is too high, and the steam turbine side needs to be added with pressure pull-back logic control.
Through the design scheme, the invention can bring the following beneficial effects: a unit adjusting strategy based on the residual electric quantity of an energy storage battery timely adjusts a unit side control strategy according to the state of the residual electric quantity SOC of the battery, and the strategy is not purely dependent on the action of an energy storage side, so that the residual electric quantity SOC of the battery always maintains an intermediate state, the advantages of high response speed of energy storage frequency modulation of the battery and the like are fully exerted, and the actions are performed as far as possible aiming at each secondary frequency modulation AGC and primary frequency modulation. The loss of the battery is reduced, and the service life of the battery is prolonged; bringing certain economic benefits for power plants.
Drawings
The invention is further described with reference to the following figures and detailed description:
fig. 1 is a schematic block diagram of a unit adjustment strategy flow based on the remaining capacity of an energy storage battery according to the present invention.
Detailed Description
A unit adjusting strategy based on the residual capacity of an energy storage battery is shown in figure 1, wherein X in the figure is the lower limit of the SOC discharge protection of the residual capacity of the battery, and 1-X is the upper limit of the charge protection. Y and 1-Y are battery middle electric quantity (45-55%), and Z is the rated load of 10% of the lowest stable combustion load of the unit.
After the unit energy storage system is put into operation, the unit puts into secondary frequency modulation AGC, dispatches and gives a secondary frequency modulation AGC command, the unit judges the change direction of the secondary frequency modulation AGC command, if the change direction is an increasing direction, the flow is carried out according to the left side in the figure 1, and if the change direction is a decreasing direction, the flow is carried out according to the right side flow in the figure I.
And after the secondary frequency modulation AGC is judged to be in an increasing direction, the fact that the battery is required to discharge to a power grid is proved, and the SOC (state of charge) of the residual electric quantity of the battery is logically judged. When the remaining charge SOC is lower than a certain lower limit value X, the capacity of the battery is not long enough, and if the battery is not charged in time, the next AGC cannot respond and the battery life is greatly lost.
And the unit adopts a corresponding control strategy, namely, the AGC instruction offset is increased according to the main steam pressure, the real load of the unit and the AGC instruction size at the moment. If the real load value of the unit is higher than 90%, the possibility of increasing the AGC command again at the next time is low, so that the AGC command offset is not needed. If the load of the unit is lower than 90%, the bias of the secondary frequency modulation AGC instruction of the unit is properly increased according to the main steam pressure, the real load of the unit and the size of the secondary frequency modulation AGC instruction, when the original secondary frequency modulation AGC instruction value is reached, the load of the unit is continuously increased, and the battery is changed into a charging state from discharging because the control strategy of the energy storage side is not changed. And at the moment, the load of the unit energy storage combined internet access is still met. When the battery reaches about the middle value Y of the residual electric quantity SOC, the set adjusts the control strategy again, the bias of the secondary frequency modulation AGC instruction is gradually reduced to the original value, the load of the set is slowly reduced to the original secondary frequency modulation AGC instruction value, the secondary stable state is reached, and at the moment, a response period is finished.
After the secondary frequency modulation AGC is judged to be in the descending direction, the fact that the battery acquires the electric quantity from the power grid is proved, and the SOC (state of charge) of the residual electric quantity of the battery is judged. When the SOC is higher than a certain upper limit, the battery capacity is not long enough, and if the battery is not discharged in time, the next AGC cannot respond and the battery life is greatly lost. The unit adopts a corresponding control strategy, namely AGC instruction offset (offset is negative at this time) is increased according to the main steam pressure, the unit real load and the AGC instruction size at this time, and if the unit real load value is in a low state (close to the lowest stable combustion load) at this time, the possibility that the AGC instruction is reduced again at the next time is low, so that AGC instruction offset does not need to be added. If the real load of the unit is not low, the control strategy condition is met, and AGC instruction offset can be properly increased according to the actual situation, so that the finally formed target load instruction is lower than the original AGC instruction. When the SOC of the battery residual capacity is higher than a certain upper limit value (1-X) and the load of the unit is higher than Z, the bias of the secondary frequency modulation AGC instruction of the unit is properly increased according to the main steam pressure, the actual load of the unit and the magnitude of the secondary frequency modulation AGC instruction at the moment, after the steady state of the original secondary frequency modulation AGC instruction is reached, the load of the unit is continuously reduced until the SOC of the battery residual capacity reaches about a middle value of 1-Y, the unit adjusts the control strategy again, the bias of the secondary frequency modulation AGC instruction is gradually reduced to the original value, so that the load of the unit is slowly increased to the initial value of the secondary frequency modulation AGC instruction, and after the steady state is reached, a.
If the initial steady state is not reached and the AGC command changes again, if the direction of the change is the same as the last change direction, the unit does not need to change the control strategy; if the direction is opposite to the last action, it is possible to directly charge the battery, just matching the battery requirement. If the main steam pressure is too high in the operation process, the steam turbine side needs to be added with pressure pull-back logic control.
Claims (3)
1. A unit adjusting strategy based on the residual electric quantity of an energy storage battery is characterized in that: comprises the following steps of (a) carrying out,
the method comprises the following steps that firstly, an energy storage system of the power grid thermal power generating unit is put into operation, a secondary frequency modulation AGC instruction is judged, the secondary frequency modulation AGC instruction is increased, a battery of the energy storage system discharges to a power grid, the energy storage system logically judges the SOC value of the residual electric quantity of the battery, the SOC value is lower than 30%, and the unit adopts a control strategy as follows:
increasing secondary frequency modulation AGC instruction offset according to the main steam pressure of the unit, the actual load of the unit and the size of a secondary frequency modulation AGC instruction until the actual load value of the unit is higher than 90%, and stopping the secondary frequency modulation AGC instruction offset;
after the real load of the unit returns to the initial secondary frequency modulation AGC instruction value, the unit continues to increase the load, the control strategy of the energy storage side is unchanged, and the battery is converted into a charging state from discharging;
charging the residual battery SOC to 45% -55%, adjusting the control strategy again by the unit, reducing the bias of the secondary frequency modulation AGC instruction to the original value, reducing the load of the unit to the original secondary frequency modulation AGC instruction value, and completing a response period after the unit is in a stable state;
step two, judging that the secondary frequency modulation AGC instruction is descending, charging the battery of the energy storage system from the power grid, logically judging the residual electric quantity SOC of the battery by the energy storage system, wherein the SOC is higher than 70%, and adopting a control strategy of a unit as follows:
adjusting the bias of a secondary frequency modulation AGC instruction according to the main steam pressure of the unit, the actual load of the unit and the size of the secondary frequency modulation AGC instruction, wherein if the actual load value of the unit is greater than 10% of the rated load above the lowest stable combustion load at the moment, the bias of the secondary frequency modulation AGC instruction is not increased; if the real load of the unit meets the control strategy condition, increasing the bias of a secondary frequency modulation AGC instruction until the target load instruction is lower than the original secondary frequency modulation AGC instruction;
after the actual load of the unit reaches the original secondary frequency modulation AGC instruction value, the unit continues to reduce the load, the energy storage side keeps the original control strategy, and the battery is converted into a discharge state from charging;
and charging the residual battery SOC to 45% -55%, adjusting the control strategy again by the unit, restoring the bias of the secondary frequency modulation AGC instruction to the original value, increasing the load of the unit to the original secondary frequency modulation AGC instruction value, and completing a response period after the unit is in a stable state.
2. The set regulation strategy based on the remaining capacity of the energy storage battery as claimed in claim 1, wherein: after a response period is completed in the first step and the second step, the set does not reach the primary steady state, the secondary frequency modulation AGC instruction changes again, the change direction is the same as the last time, and the set operates according to the original control strategy; the change direction of the secondary frequency modulation AGC instruction is opposite to the last time, and the energy storage system directly charges the battery.
3. The set regulation strategy based on the remaining capacity of the energy storage battery as claimed in claim 1, wherein: and in the operation process of the energy storage system of the power grid thermal power generating unit, the main steam pressure is too high, and the steam turbine side needs to be added with pressure pull-back logic control.
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| CN112186778A (en) * | 2020-09-12 | 2021-01-05 | 江苏方天电力技术有限公司 | Primary frequency modulation optimization control method and system |
| CN112787340A (en) * | 2021-01-04 | 2021-05-11 | 上海外高桥第三发电有限责任公司 | Control method for combined frequency modulation of thermal power and energy storage system |
| CN113725881A (en) * | 2021-08-26 | 2021-11-30 | 深圳市今朝时代股份有限公司 | Super-capacitor energy storage device for auxiliary frequency modulation and control method |
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