CN111262263B - Unit regulation strategy based on residual electric quantity of energy storage battery - Google Patents
Unit regulation strategy based on residual electric quantity of energy storage battery Download PDFInfo
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- CN111262263B CN111262263B CN202010165141.4A CN202010165141A CN111262263B CN 111262263 B CN111262263 B CN 111262263B CN 202010165141 A CN202010165141 A CN 202010165141A CN 111262263 B CN111262263 B CN 111262263B
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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
A unit regulation strategy based on the residual electric quantity of an energy storage battery belongs to the technical field of power grid operation and maintenance, and unit control strategies are timely regulated according to the residual electric quantity SOC of the energy storage battery, a secondary frequency modulation AGC instruction, a primary frequency modulation instruction, unit load and the like, so that primary frequency modulation and secondary frequency modulation performances are met, an existing control algorithm is optimized, the amplitude of frequency fluctuation is reduced, the recovery of frequency is accelerated, meanwhile, the SOC of the energy storage can be effectively maintained, and adverse disturbance to a system caused by energy storage when the SOC is out of limit is avoided. The service life of the battery is prolonged as much as possible, and the income is improved. On the basis of the existing algorithm for controlling the unit and the energy storage system independently, the control rule considering SOC feedback is combined, the control strategy of the unit and the energy storage is combined, 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 operation and maintenance of power grids, and particularly relates to a unit regulation strategy based on the residual electric quantity SOC of an energy storage battery.
Background
Along with the increase of the permeability of clean energy power generation, the development of energy storage technology and the construction of energy storage projects become key methods for solving the intermittent defect of clean energy and ensuring the safe operation of a power grid. The guidance opinion on promoting the development of the energy storage technology and industry in China is published in 10 and 11 2017, which is taken as the first guidance policy of the energy storage industry in China, the problems of insufficient policy support, insufficient research and development teachers, insufficient technical standards, insufficient overall planning and the like in the development of the energy storage technology and industry in the current stage of China are pointed out, and the development targets and key tasks of the energy storage technology and industry in the next ten years are proposed.
From the above, energy storage is about to become the dominant trend of power plants to quickly respond to power grid load changes. 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 situation that the original unit and the energy storage system are matched together is not considered, the existing technology is that the coordination control is not strong according to the fact that the energy storage side and the unit side are approximately independent of each other, the control strategy of the energy storage side is direct, the service life of the battery is less, the unit side does not change correspondingly before and after the operation of the energy storage battery, and the coordination with the energy storage side is less.
The known energy storage frequency modulation strategy is generally that a battery and a unit respond simultaneously according to a secondary frequency modulation AGC instruction issued by scheduling, the generated power is the difference between the secondary frequency modulation AGC instruction and the real load of the unit, and the unit side is the same as that of the non-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, and the unit responds independently until the secondary frequency modulation AGC instruction is reduced, so that the unit can charge the battery; similarly, when the SOC of the remaining battery is too high, if the AGC command is lowered, the battery must give up the response, and the unit responds independently until the secondary fm AGC command is increased, and the battery can be used for discharging to satisfy the response. The analysis shows that the response of the battery to the secondary frequency modulation AGC command can be abandoned for many times in the operation, the essential meaning of energy storage frequency modulation is lost, and the economic benefit is lost. A new solution is needed to solve this problem.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: providing a unit regulation strategy based on the residual electric quantity of an energy storage battery, and timely regulating a unit side control strategy according to the state of the residual electric quantity SOC of the battery, wherein the unit side control strategy is not purely dependent on the action of the energy storage side, and finally, the state of the residual electric quantity SOC of the battery is always maintained at about an intermediate value; the advantages of high response speed of the battery energy storage frequency modulation are fully exerted, and the battery acts as far as possible for 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; the method can actively respond to the secondary frequency modulation AGC and primary frequency modulation action instructions each time, and brings certain economic benefit to the power plant.
A unit regulation strategy based on the residual capacity of an energy storage battery is characterized in that: comprises the steps of,
step one, an energy storage system of a 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 the power grid, the logic of the energy storage system 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 of:
adding secondary frequency modulation AGC command bias according to the main steam pressure of the unit, the real load of the unit and the secondary frequency modulation AGC command size until the real load value of the unit is higher than 90%, and stopping the secondary frequency modulation AGC command bias;
after the actual load of the unit returns to the initial secondary frequency modulation AGC command value, the unit continues to lift the load, the control strategy of the energy storage side is unchanged, and the battery is converted into a charging state from discharging;
the battery residual quantity SOC is charged to 45% -55%, the unit adjusts the control strategy again, the secondary frequency modulation AGC command bias is reduced to the original value, the unit load is reduced to the primary secondary frequency modulation AGC command value, and after the steady state, a response period is completed;
step two, judging the secondary frequency modulation AGC instruction as falling, charging the energy storage system battery from the power grid, and judging the residual electric quantity SOC of the battery by the logic of the energy storage system, wherein the SOC is higher than 70%, and the control strategy adopted by the unit is as follows:
adjusting the bias of the secondary frequency modulation AGC command according to the main steam pressure of the unit, the actual load of the unit and the magnitude of the secondary frequency modulation AGC command, and if the actual load value of the unit is 10% of rated load above the lowest stable combustion load at the moment, the bias of the secondary frequency modulation AGC command is not increased; if the actual load of the unit meets the control strategy condition, adding the bias of the 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 continuously reduces the load, the energy storage side maintains the original control strategy, and the battery is converted into a discharging state from charging;
and (3) charging the residual battery SOC to 5% -55%, regulating the control strategy again by the unit, and recovering the secondary frequency modulation AGC instruction bias to the original value, so that the load of the unit is increased to the initial secondary frequency modulation AGC instruction value, and completing a response period after the unit is stable.
After a response period is completed in the first step and the second step, the unit does not reach a primary steady state, the secondary frequency modulation AGC command is changed again, the change direction is the same as the last time, and the unit 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.
The main steam pressure is too high in the operation process of the energy storage system of the power grid thermal power generating unit, and the pressure pulling logic control needs to be increased on the side of the steam turbine.
Through the design scheme, the invention has the following beneficial effects: the unit regulation strategy based on the residual electric quantity of the energy storage battery timely regulates the unit side control strategy according to the state of the residual electric quantity of the battery SOC, does not purely depend on the action of the energy storage side, finally enables the state of the residual electric quantity of the battery SOC to be always kept in an intermediate state, fully exerts the advantages of high response speed of energy storage and frequency modulation of the battery, and acts as far as possible for 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 to the power plant.
Drawings
The invention is further described with reference to the drawings and detailed description which follow:
fig. 1 is a schematic block diagram of a unit adjustment strategy flow based on the residual capacity of an energy storage battery.
Detailed Description
A unit regulation strategy based on the residual capacity of an energy storage battery is shown in fig. 1, wherein X is the lower limit of the discharge protection of the SOC of the residual capacity of the battery, and 1-X is the upper limit of the charge protection. Y and 1-Y are the middle electric quantity (45% -55%) of the battery, and Z is the rated load of the unit, wherein the rated load floats up by 10% at the lowest stable combustion load.
After the unit energy storage system is put into operation, the unit inputs the secondary frequency modulation AGC, the secondary frequency modulation AGC command is scheduled to be issued, the unit judges the change direction of the secondary frequency modulation AGC command, and the flow is carried out according to the left side in the figure 1 and the right side in the figure as the decreasing direction if the change direction of the secondary frequency modulation AGC command is the increasing direction.
After judging that the secondary frequency modulation AGC is in the increasing direction, the battery is proved to discharge to the power grid, and the logic judges the residual electric quantity SOC of the battery. When the remaining power SOC is lower than a certain lower limit value X, the capacity of the battery is not enough to be maintained for too long, and if the battery is not charged in time, the next AGC may not respond, and there is a large loss to the life of the battery.
The unit adopts a corresponding control strategy, namely, the AGC command bias is increased according to the main steam pressure, the unit actual load and the AGC command size at the moment. If the actual load value of the unit is higher than 90%, the probability of the next AGC command increase is smaller, so that the AGC command bias is not needed. If the load of the unit is lower than 90%, the secondary frequency modulation AGC command bias of the unit is properly increased according to the main steam pressure, the real load of the unit and the secondary frequency modulation AGC command at the moment, and after the primary secondary frequency modulation AGC command value is reached, the continuous load rising of the unit is changed from discharging to charging state because the control strategy of the energy storage side is unchanged. At the moment, the energy storage combination of the machine set still meets the internet load. When the battery reaches about the residual electric quantity SOC intermediate value Y, the unit adjusts the control strategy again, and the secondary frequency modulation AGC command bias is gradually reduced to the original value, so that the load of the unit is slowly reduced to the initial secondary frequency modulation AGC command value, the second steady state is reached, and a response period is ended.
After judging that the secondary frequency modulation AGC is in the descending direction, the battery is proved to acquire electric quantity from the power grid, and the residual electric quantity SOC of the battery is judged. When the SOC is above a certain upper limit, the battery capacity is insufficient to last too long, and if not discharged in time, the next AGC may not respond, and there is a large loss of battery life. The unit adopts a corresponding control strategy, namely, the AGC command bias is increased according to the main steam pressure, the unit actual load and the AGC command (the bias is negative at the moment), and if the unit actual load value is in a lower state (close to the lowest stable combustion load) at the moment, the possibility of the next AGC command drop is smaller, so that the AGC command bias is not needed. If the actual load of the unit is not low, the control strategy condition is met, and the AGC command bias can be properly increased according to the actual situation, so that the finally formed target load command is lower than the original AGC command. When the battery residual electric quantity SOC is higher than a certain upper limit value (1-X) and the unit load is higher than Z, the unit secondary frequency modulation AGC command bias is properly increased according to the main steam pressure, the unit actual load and the secondary frequency modulation AGC command at the moment, after the original secondary frequency modulation AGC command steady state is reached, the unit continues to reduce the load until the battery residual electric quantity SOC reaches about a middle value of 1-Y, the unit adjusts the control strategy again, and the secondary frequency modulation AGC command bias is gradually reduced to the original value, so that the unit load is slowly increased to the initial secondary frequency modulation AGC command value, and after the steady state is reached, a response period is ended.
If the primary steady state is not reached yet and the AGC command is changed again, the unit does not need to change the control strategy if the direction of the AGC command is the same as the previous change direction; if the direction of the previous action is opposite, the battery can be directly charged, and the battery requirement is exactly matched. If the pressure of the main steam is too high in the running process, the pressure of the steam turbine side needs to be increased to carry out logic control.
Claims (3)
1. A unit regulation strategy based on the residual capacity of an energy storage battery is characterized in that: comprises the steps of,
step one, an energy storage system of a 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 the power grid, the logic of the energy storage system 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 of:
adding secondary frequency modulation AGC command bias according to the main steam pressure of the unit, the real load of the unit and the secondary frequency modulation AGC command size until the real load value of the unit is higher than 90%, and stopping the secondary frequency modulation AGC command bias;
after the actual load of the unit returns to the initial secondary frequency modulation AGC command value, the unit continues to lift the load, the control strategy of the energy storage side is unchanged, and the battery is converted into a charging state from discharging;
the battery residual quantity SOC is charged to 45% -55%, the unit adjusts the control strategy again, the secondary frequency modulation AGC command bias is reduced to the original value, the unit load is reduced to the primary secondary frequency modulation AGC command value, and after the steady state, a response period is completed;
step two, judging the secondary frequency modulation AGC instruction as falling, charging the energy storage system battery from the power grid, and judging the residual electric quantity SOC of the battery by the logic of the energy storage system, wherein the SOC is higher than 70%, and the control strategy adopted by the unit is as follows:
adjusting the bias of the secondary frequency modulation AGC command according to the main steam pressure of the unit, the actual load of the unit and the magnitude of the secondary frequency modulation AGC command, and if the actual load value of the unit is 10% of rated load greater than the lowest stable combustion load at the moment, the bias of the secondary frequency modulation AGC command is not increased; if the actual load of the unit is not low, the control strategy condition is met, and the bias of the secondary frequency modulation AGC instruction is increased, so that the finally formed target load instruction is lower than the original AGC instruction;
after the actual load of the unit reaches the original secondary frequency modulation AGC instruction value, the unit continuously reduces the load, the energy storage side maintains the original control strategy, and the battery is converted into a discharging state from charging;
and (3) charging the residual battery SOC to 45% -55%, regulating the control strategy again by the unit, and recovering the secondary frequency modulation AGC instruction bias to the original value, so that the load of the unit is increased to the initial secondary frequency modulation AGC instruction value, and completing a response period after the unit is stable.
2. The unit adjustment strategy based on the remaining capacity of the energy storage battery according to claim 1, wherein: after a response period is completed in the first step and the second step, the unit does not reach a primary steady state, the secondary frequency modulation AGC command is changed again, the change direction is the same as the last time, and the unit 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 unit adjustment strategy based on the remaining capacity of the energy storage battery according to claim 1, wherein: the main steam pressure is too high in the operation process of the energy storage system of the power grid thermal power generating unit, and the pressure pulling logic control needs to be increased on the side of the steam turbine.
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| CN112787340B (en) * | 2021-01-04 | 2023-07-18 | 上海外高桥第三发电有限责任公司 | Control method for joint frequency modulation of thermal power and energy storage system |
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| CN104201670A (en) * | 2014-08-28 | 2014-12-10 | 湖南大学 | Cooperative control method and system of battery energy storage power source participating in secondary frequency modulation of power grid |
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