A control method for connecting large-capacity electric heat storage to automatic power generation
A control method and electric heat storage technology, applied in circuit devices, AC network circuits, and AC network load balancing, etc., can solve problems such as excessive input of power grid, massive loss of electric energy, unreasonable distribution, etc., and achieve the effect of optimal output level.
Active Publication Date: 2021-07-13
STATE GRID LIAONING ELECTRIC POWER RES INST +2
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Problems solved by technology
After the large-capacity electric heat storage is connected, the frequency and range of inter-regional support will inevitably increase
Due to the unreasonable distribution of large-capacity electric heat storage equipment at the power plant side and grid power, it leads to a large loss of electric energy or excessive input to the grid. In view of this technical defect, a reasonable distribution control method is adopted in this design, which can Breaking the model of "determining power by heat" and maximizing the consumption of new energy
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Embodiment Construction
[0046] In July, an area adopts electric heat storage to connect to automatic power generation control. The rated output power of the generator is 600MW, the frequency of the power grid is 50.2HZ, the heat storage capacity of the electric heat storage device is 4000MWh, and the initial temperature of the water is 20°C. The abandoned air volume is 50 million kW·h.
[0047] From the above formula can be obtained:
[0048] 1. The influence of the frequency of the power grid on the proportion of electric heat storage power is based on the following formula
[0049]
[0050] Among them, the actual frequency f = 50.2HZ, the rated frequency f 0 =50HZ, B=0.25, the power loss and natural frequency response coefficient of the control area is
[0051]
[0052] Substituting into the above formula gives P f ≈0.369.
[0053] 2. The ability of the water medium to transfer heat to the surrounding is
[0054] A tr = α 2 QT = α 2 mCT 2
[0055] The influence of temperature on the...
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The invention relates to a control method for large-capacity electric heat storage connected to automatic power generation, which belongs to the field of power system active power dispatching. The main task is to reasonably allocate electric heat storage and power grid power ratio. The heat temperature, the local abandoned air volume, time, and the heat storage capacity of the electric heat storage device are then theoretically calculated by the corresponding formula to obtain the corresponding power distribution ratio. When the electric heat storage equipment is involved, due to the unreasonable distribution of the large-capacity electric heat storage equipment at the power plant and the grid power, it will lead to a large loss of electric energy or excessive input to the grid. In view of this technical defect, this design adopts a A control method for rational allocation, so that the power can be allocated reasonably under different conditions at different times and regions, and its role can be fully exerted to achieve the optimal output level.
Description
technical field [0001] The invention belongs to the field of active power dispatching of electric power systems, and relates to a method for controlling the connection of large-capacity electric heat storage into an automatic power generation system. Background technique [0002] Nowadays, my country's power supply structure is dominated by cogeneration units, and its ability to participate in peak regulation is poor. Moreover, the operation of combined heat and power (CHP) units in the heating season further reduces the adjustment capacity, making the output power distribution capacity of the power plant poor. In the heat supply season, cogeneration units adopt the operation mode of "heating to determine power" to meet the heat load demand, and the adjustment capacity is also greatly limited, which significantly increases the contradiction of insufficient peak shaving capacity of the system. Moreover, there is no clarity on how to realize the specific calculation of power ...
Claims
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IPC IPC(8): H02J3/46H02J3/28
CPCH02J3/28H02J3/46H02J2203/20
Inventor 葛维春赵阳沈力谭洪恩张铁岩王顺江尹东李家珏滕云
Owner STATE GRID LIAONING ELECTRIC POWER RES INST