Digital fast and accurate auto-step parallel control method for generators
A control method and generator technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve problems such as slow response speed, signal susceptibility to interference, power grid impact, etc.
Active Publication Date: 2011-12-21
COSCO SHIPPING TECH CO LTD
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Problems solved by technology
[0003] (1) The controller has poor real-time performance, slow response speed, and the signal is susceptible to interference. In actual use, it takes a long time to close the brake and merge vehicles and the success rate is low
[0004] (2) The control signal drifts, the performance is unstable, and the accuracy of capturing the closing and paralleling signal is reduced, resulting in a large closing phase deviation, which has a greater impact on the power grid and affects power quality
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Embodiment Construction
[0015] Below in conjunction with accompanying drawing and embodiment the present invention will be further described
[0016] In an embodiment of the present invention, a main switch closing time is 100ms engine group and the power grid whose base frequency is 50Hz is paralleled. After starting up, its control process includes the following steps (as shown in Figure 1):
[0017] (1) Input control mode, voltage difference and other chain protection signals (switching value);
[0018] (2) Input the generator and power grid voltage signals that have been shaped into square waves by band-pass filtering, and the CPLD triggers counting with a pulse rising string in one cycle, and the next cycle pulse rising string triggers latching and clears to restart counting, and measures the generator And the frequency of the power grid, the counter is 16 bits, the counting frequency is 1MHz, and the real-time frequency difference ΔF is obtained;
[0019] (3) Taking the real-time frequency dif...
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The invention relates to a digital, fast, accurate and self-synchronizing paralleling control method for generators, and relates to the technical field of generator paralleling control. The present invention is based on a large-scale intelligent programmable CPLD device, adopts pulse full-period ascending string trigger counting method and PWM pulse width modulation technology to realize generator speed regulation, and adopts positive correlation between frequency difference ΔF and lead time ΔT set pulse value and The criterion formed by the real-time phase pulse value measured by the "mixed wave counting method" realizes the fast and accurate capture of the closing signal. The digital fast and precise self-synchronizing paralleling control method is practical, low cost, stable in performance and strong in anti-interference, and effectively overcomes the poor real-time performance, slow phase capture and accurate closing of the existing general self-synchronizing paralleling control method Sexuality and low success rate.
Description
technical field [0001] The invention relates to the technical field of generator parallel control, and specifically refers to a CPLD-based digital fast and precise self-synchronized parallel control method. Background technique [0002] In the prior art, the generator self-synchronizing paralleling controller is generally composed of a microprocessor and an analog signal processing circuit. In terms of control methods, there are two ways to obtain the closing and paralleling signal: one is to use the phase difference pulse signal F / V conversion and then compare it with the set signal to obtain the closing and paralleling command; the other is to use a microprocessor After the high-speed input and related software calculations, it captures the closing and paralleling signals. At present, the automatic step-by-step parallel controllers of generators in the domestic market generally adopt imported products, because there are few such products designed and developed by China it...
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IPC IPC(8): H02J3/42
Inventor 徐永法周群陈洁全江楚刘俊郑晓鸣彭霞
Owner COSCO SHIPPING TECH CO LTD