Wind fire bundling system control device and method thereof

Abstract

The invention relates to a wind fire bundling system control device and a method thereof. The method includes the following steps that a direct current emergency frequency control strategy is made aiming at wind fire bundling system frequency stability problems under two conditions of wind power plant power fluctuation and fault shutdown respectively; when a wind power plant runs normally, high wind power fluctuation can cause frequency instability easily, direct current double-side frequency modulation is utilized as the emergency control, and the thermal power generating unit frequency modulation is utilized as the auxiliary strategy; when the wind power plant runs abnormally, the wind power plant fault shutdown can cause frequency temporary state instability easily, a direct current emergency lifting / dropping control strategy is provided, and the thermal power generating frequency modulation fluctuation is utilized as the auxiliary strategy. The device and the method meet the frequency modulation requirement of a wind fire bundling direct current islet outgoing system, can effectively solve the wind fire bundling sending end system frequency stability problem caused by wind power fluctuation and wind power plant fault shutdown, avoids action of the wind power plant or a thermal power generating unit protection device, and improves system operation reliability.

Description

technical field [0001] The invention relates to the field of grid-connected security and stability control of new energy power generation technology, in particular to a control device and method for a wind-fire bundling system. Background technique [0002] Wind energy is currently the most economical new energy that is widely used. Northwest China is rich in wind power resources, but due to the reverse distribution of energy and load in my country, the current development of wind power energy in Northwest China is mainly focused on large-scale centralized access, long-distance transmission, and large-scale consumption. Similar to the situation in Northwest China, there is also a demand for wind power and thermal power to be sent out at the same time in wind power and coal power-intensive areas such as northern my country and northeastern China. The above-mentioned wind power and thermal power energy bases are more than 2000km away from the eastern and central load centers. ...

AI Technical Summary

Problems solved by technology

[0003] Due to the random change of wind speed, the change of wind power has volatility and uncertainty. The large fluctuation of wind power or the outage of wind farm due to failure will lead to the unbalance of active power of the sending end system and cause frequency stability problems.

The existing wind turbines in operation in my country do not participate in the system frequency adjustment, and the frequency adjustment of the power grid must be shared by traditional power plants, which increases the frequency regulation burden of thermal power units

At the same time, at present, my country's DC transmission system is generally in a constant power or constant current mode, and the transmission power is basically kept constant during operation, which is equivalent to a constant load. This mode aggravates the power imbalance of the sending end system. If only relying on the thermal power unit at the sending end One-time frequency modulation is difficult to meet the system frequency requirements in the case of rapid wind power changes and wind farm failures, which has a serious impact on the frequency stability of the sending end system

[0004] In the prior art, generally only the primary frequency modulation function of the thermal power unit is used, and the system block diagram of the primary frequency modulation is as follows figure 1 As shown, among them, the amplification link is a proportional amplifier, and the servo link is The speed regulation dead zone ε, the limiting link limits the maximum output power P of the prime mover MAX , minimum output power P MIN , only one-time frequency modulation of thermal power units is used, it is difficult to cope with rapid and large wind farm power changes and the failure of wind farms to exit the operation, so that the frequency of the sending end system deviates from the normal range, which is not conducive to the stable operation of the system

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