CN-114744637-B - Frequency error prevention method and system based on wide-area low-frequency centralized cut pump

CN114744637BCN 114744637 BCN114744637 BCN 114744637BCN-114744637-B

Abstract

The application discloses a frequency error prevention method and a system based on a wide area low frequency centralized cut pump, wherein the method comprises the steps of receiving the frequency of operation equipment sent by each transformer substation or energy storage power plant, and starting a low frequency centralized control device if the frequency of any operation equipment is smaller than or equal to the starting frequency; and when the measured frequency is lower than the preset 'action frequency' and reaches 'action delay', cutting off the pump load of each energy storage power plant according to the preset 'cutting-off pump number' fixed value. According to the frequency error prevention method based on the wide-area low-frequency centralized pump, frequency error prevention is effectively achieved by means of the frequencies of different station operation equipment, the purpose of stabilizing the frequency of the power system is achieved, and the stability of the power system is maintained.

Inventors

ZHANG YUAN
CHEN XINGHUA
CHEN JINCHANG
AN RANRAN
WANG YI
LI XINCHAO

Assignees

广东电网有限责任公司
广东电网有限责任公司电力科学研究院

Dates

Publication Date: 20260512
Application Date: 20220510

Claims (8)

1. A frequency error prevention method based on a wide area low frequency centralized cut pump, comprising the steps of: Receiving the frequency of operation equipment transmitted by each transformer substation or energy storage power plant, and starting a low-frequency centralized control device if the frequency of any operation equipment is smaller than or equal to the starting frequency; the frequency integrated value of the operation equipment is calculated, and the measurement frequency of the low-frequency centralized control device is determined, which comprises the steps of receiving the frequency of the operation equipment of each transformer substation or energy storage power plant, and setting the transformer substation or the energy storage power plant as The operation equipment is And (3) calculating according to the following formula: ; In the formula, For substations or energy-storing power plants In (a) The actual frequency of the operating device is such that, For substations or energy-storing power plants A minimum value of the frequency of the operating equipment, For substations or energy-storing power plants A maximum value of the frequency of the medium-operating device; when the low-frequency centralized control device can simultaneously acquire the frequencies sent by two or more substations or energy storage power plants, the measuring frequency of the low-frequency centralized control device is acquired Is the 2 nd minimum value of (2); when the low-frequency centralized control device can only acquire the frequency of one transformer substation or energy storage power plant, the measurement frequency of the low-frequency centralized control device is taken ; When the measurement frequency is lower than the preset 'action frequency' and the 'action delay' is reached, cutting off the pump load of each energy storage power plant according to the preset 'cutting off pump number' fixed value.
2. The method for preventing frequency error based on wide area low frequency centralized cut pump according to claim 1, further comprising, before said receiving the frequency of the operation equipment transmitted from each substation or energy storage power plant: setting the action frequency, action delay and cut-off pump number of the low-frequency centralized control device.
3. The frequency error prevention method based on wide area low frequency centralized cut pump according to claim 1, wherein when the measured frequency is lower than a preset "action frequency" and reaches an "action delay", cutting off the pump load of each energy storage power plant according to a preset "cut pump number" fixed value, comprising: When (when) The pump cutting is carried out according to the turn sequence after the action frequency is less than the action frequency of any turn and the action delay is carried out; When (when) The 2 nd small value of (2) is smaller than the action frequency of any turn and is cut into pumps according to the turn sequence after action delay.
4. The wide area low frequency centralized cut-off pump based frequency error prevention method of claim 1, further comprising: When the frequency of any operation equipment of a certain transformer substation or an energy storage power plant is received by the low-frequency centralized control device to be smaller than or equal to the starting frequency, the device is started after the starting delay.
5. A frequency error prevention system based on wide area low frequency centralized cut pump, comprising: the device starting unit is used for receiving the frequency of the operation equipment transmitted by each transformer substation or the energy storage power plant, and starting the low-frequency centralized control device if the frequency of any operation equipment is smaller than or equal to the starting frequency; The frequency integrated value calculation unit is used for calculating the frequency integrated value of the operation equipment and determining the measurement frequency of the low-frequency centralized control device, and comprises the steps of receiving the frequency of the operation equipment of each transformer substation or energy storage power plant and setting the transformer substation or the energy storage power plant as The operation equipment is And (3) calculating according to the following formula: ; In the formula, For substations or energy-storing power plants In (a) The actual frequency of the operating device is such that, For substations or energy-storing power plants A minimum value of the frequency of the operating equipment, For substations or energy-storing power plants A maximum value of the frequency of the medium-operating device; when the low-frequency centralized control device can simultaneously acquire the frequencies sent by two or more substations or energy storage power plants, the measuring frequency of the low-frequency centralized control device is acquired Is the 2 nd minimum value of (2); when the low-frequency centralized control device can only acquire the frequency of one transformer substation or energy storage power plant, the measurement frequency of the low-frequency centralized control device is taken ; And the pump cutting unit is used for cutting off the pump load of each energy storage power plant according to a preset pump cutting number setting value when the measurement frequency is lower than the preset action frequency and the action delay is reached.
6. The wide area low frequency centralized cut-pump based frequency error prevention system of claim 5, further comprising: And the fixed value setting unit is used for setting the action frequency, the action delay and the fixed value of the cutting pump number of each action frequency and the starting frequency of the low-frequency centralized control device.
7. The wide area low frequency centralized pump-cutting based frequency error prevention system of claim 5, wherein the pump-cutting unit is further configured to: When (when) The pump cutting is carried out according to the turn sequence after the action frequency is less than the action frequency of any turn and the action delay is carried out; When (when) The 2 nd small value of (2) is smaller than the action frequency of any turn and is cut into pumps according to the turn sequence after action delay.
8. The wide area low frequency centralized pump-based frequency error prevention system of claim 5, wherein the device activation unit is further configured to: When the frequency of any operation equipment of a certain transformer substation or an energy storage power plant is received by the low-frequency centralized control device to be smaller than or equal to the starting frequency, the device is started after the starting delay.

Description

Frequency error prevention method and system based on wide-area low-frequency centralized cut pump Technical Field The application relates to the technical field of scheduling operation and control of power systems, in particular to a frequency error prevention method and system based on a wide-area low-frequency centralized cut pump. Background At present, in daily operation of a power grid, when a full system or a separated local system of the power system has active power shortage and causes frequency reduction, a sufficient number of secondary loads should be automatically cut off according to the frequency reduction amplitude so as to ensure safe operation of the system and uninterrupted power supply of important users. The pumped storage power station is an energy storage technology which is widely applied and has large capacity in the current power system, and is mainly configured in a power grid to have the functions of peak regulation and valley filling, phase modulation, accident standby, black start and the like. However, aiming at the situation of power shortage of the power system, the prior art lacks a method capable of intensively cutting off pumps and accurately and stably controlling the frequency, so that the frequency regulation effect of the power system is not ideal and the stability is poor. Disclosure of Invention The application aims to provide a frequency error prevention method based on a wide-area low-frequency centralized cut pump, which can accurately and effectively control frequency stability and maintain stability of a power system when aiming at power shortage of the power system. In order to achieve the above object, the present application provides a frequency error prevention method based on a wide area low frequency centralized cut pump, comprising: Receiving the frequency of operation equipment transmitted by each transformer substation or energy storage power plant, and starting a low-frequency centralized control device if the frequency of any operation equipment is smaller than or equal to the starting frequency; calculating the frequency integrated value of the operation equipment, and determining the measurement frequency of the low-frequency centralized control device; When the measurement frequency is lower than the preset 'action frequency' and the 'action delay' is reached, cutting off the pump load of each energy storage power plant according to the preset 'cutting off pump number' fixed value. Further, preferably, before the receiving the frequency of the operation device sent by each substation or energy storage power plant, the method further includes: setting the action frequency, action delay and cut-off pump number of the low-frequency centralized control device. Further, preferably, the calculating the frequency integrated value of the operating device, determining the measurement frequency of the low-frequency centralized control device, includes: receiving the frequency of operation equipment of each transformer substation or energy storage power plant, setting the transformer substation or energy storage power plant as i, and n operation equipment, and calculating according to the following formula: Wherein f in is the actual frequency of n operating devices in the transformer substation or the energy storage power plant i, f imin is the minimum value of the frequency of the operating devices in the transformer substation or the energy storage power plant i, and f imax is the maximum value of the frequency of the operating devices in the transformer substation or the energy storage power plant i; When the low-frequency centralized control device can simultaneously acquire the frequencies sent by two or more substations or energy storage power plants, the measurement frequency of the low-frequency centralized control device takes the 2 nd small value of f imin; When the low-frequency centralized control device can only acquire the frequency of one transformer substation or energy storage power plant, the measurement frequency of the low-frequency centralized control device is f imax. Further, preferably, when the measured frequency is lower than a preset "action frequency" and an "action delay" is reached, the step of cutting off the pump load of each energy storage power plant according to a preset "cut-off pump number" constant value includes: when f imax is smaller than the action frequency of any turn and action delay is carried out, pump cutting is carried out according to the turn sequence; And when the 2 nd small value of f imin is smaller than the action frequency of any turn and the action delay is passed, performing cutting pumping according to the turn sequence. Further, preferably, the frequency error prevention method based on the wide area low frequency centralized cutting pump further includes: When the frequency of any operation equipment of a certain transformer substation or an energy storage power plant is received by the low-freque