Coordination control method for frequency modulation participated by low-frequency off-network device of power system
A coordinated control and power system technology, applied in the direction of AC network voltage adjustment, single-network parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve problems such as insufficient backup, low-frequency suspension, and insufficient prevention and control of stability control strategies. To achieve the effect of solving the shortage of backup and enriching the means of frequency modulation
Pending Publication Date: 2022-04-26
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology
[0004] In order to overcome the deficiencies in the above-mentioned existing technologies, the purpose of the present invention is to provide a coordinated control method for low-frequency off-grid devices in power systems to participate in frequency modulation, so as to solve the possible backup shortage and the prevention of stable control strategies after large-scale new energy access. Low-frequency suspension problems caused by improper control
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[0039] figure 2 It is a flowchart of an embodiment of the present invention. In this embodiment, a coordinated control method in which a power system low-frequency off-grid device participates in frequency modulation, the process is as follows:
[0040] Step 1: Monitor the fundamental frequency of the voltage at the installation point in real time through the low-frequency off-grid device, and calculate the deviation of the fundamental frequency. The calculation formula is;
[0041]
[0042] in, is the fundamental frequency deviation of installation point k at time t, f 0 is the fundamental standard frequency, in this embodiment, f 0 Take 50Hz, is the measured value of the fundamental frequency of installation point k at time t;
[0043] Step 2: If the frequency fluctuation is very small and the system frequency remains above 49.967Hz, all devices involved in frequency modulation will not operate, and the system will run normally;
[0044] Step 3: If the frequency ...
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The invention discloses a coordination control method for frequency modulation participated by a low-frequency off-network device of a power system, and the method comprises the following steps: S1, monitoring the voltage fundamental frequency of an installation point in real time through the low-frequency off-network device, and obtaining the fundamental frequency deviation value of the installation point at the current moment according to the monitored voltage fundamental frequency of the installation point; and S2, performing coordination control on all devices participating in frequency modulation according to the obtained fundamental wave frequency deviation value of the installation point at the current moment.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to a coordinated control method for low-frequency off-grid devices in power systems to participate in frequency modulation. Background technique [0002] With the introduction of a new power system with new energy as the main body, the proportion of wind power and photovoltaic access will further increase, and its randomness and volatility pose new challenges to the safe and stable operation of the power system, especially in terms of grid frequency stability. [0003] In the past, the power system frequency regulation system was established under the arrangement of deterministic operation mode, and the possible faults in the system were exhausted to determine the reserve capacity and stability control strategy. After large-scale new energy access, on the one hand, the prediction accuracy of new energy output is not high, and on the other hand, the uncertainty of new energy ou...
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IPC IPC(8): H02J3/14H02J3/24H02J3/48
CPCH02J3/14H02J3/241H02J3/48
Inventor 吴小珊吴为周保荣
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD